/* ==========================================================================
   AI 原生学习路线 · learn 样式层（v2 重制）
   --------------------------------------------------------------------------
   命名契约：materin-learn-<component>[__part][--variant]，状态 is-*。
   颜色一律走 --materin-* 令牌（由 /assets/css/materin-ui.css 提供），零裸色值。
   质感对齐品牌站：毛玻璃 + 高光边 + 两级阴影 + 渐变点缀。
   竖屏录屏版：body.is-stage（1080×1920）。
   ========================================================================== */

/* --- 页头：毛玻璃 --------------------------------------------------- */
.materin-learn-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: var(--materin-glass-bg, color-mix(in srgb, var(--materin-surface) 74%, transparent));
  backdrop-filter: var(--materin-glass-blur, blur(20px) saturate(180%));
  -webkit-backdrop-filter: var(--materin-glass-blur, blur(20px) saturate(180%));
  border-bottom: 1px solid var(--materin-border);
}

.materin-learn-header__inner {
  display: flex;
  align-items: center;
  gap: 20px;
  max-width: var(--wrap, 1080px);
  margin: 0 auto;
  padding: 14px 24px;
}

.materin-learn-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.materin-learn-brand:hover { text-decoration: none; }

.materin-learn-brand__name {
  color: var(--materin-text);
  font-weight: 650;
  font-size: 15px;
  letter-spacing: 0.02em;
}

.materin-learn-brand__tag {
  padding: 2px 9px;
  border: 1px solid var(--materin-accent-border);
  border-radius: 999px;
  background: var(--materin-accent-soft);
  color: var(--materin-accent);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.materin-learn-header__nav {
  display: flex;
  gap: 20px;
  margin-left: auto;
}

.materin-learn-header__nav a {
  color: var(--muted);
  font-size: 13px;
  text-decoration: none;
  transition: color var(--materin-duration-fast, 0.15s) var(--materin-ease-standard, ease);
}

.materin-learn-header__nav a:hover { color: var(--materin-text); }

.materin-learn-lang {
  display: inline-flex;
  border: 1px solid var(--materin-border);
  border-radius: 999px;
  overflow: hidden;
}

.materin-learn-lang button {
  padding: 3px 11px;
  border: none;
  background: transparent;
  color: var(--muted);
  font-size: 12px;
  cursor: pointer;
  transition: all var(--materin-duration-fast, 0.15s) ease;
}

.materin-learn-lang button:hover {
  color: var(--materin-text);
  background: var(--materin-surface-3);
}

/* --- 主栏 ----------------------------------------------------------- */
.materin-learn-main {
  max-width: 820px;
  margin: 0 auto;
  padding: 48px 24px 32px;
}

.materin-learn-footer {
  max-width: 820px;
  margin: 0 auto;
  padding: 26px 24px 44px;
  border-top: 1px solid var(--materin-border);
}

.materin-learn-footer p {
  margin: 0;
  color: var(--muted);
  font-size: 12.5px;
  letter-spacing: 0.04em;
}

/* --- 每日页头部：大标题 + 阶段进度 ---------------------------------- */
.materin-learn-dayhead { margin-bottom: 30px; }

.materin-learn-dayhead__meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.materin-learn-pill {
  padding: 3px 12px;
  border: 1px solid var(--materin-accent-border);
  border-radius: 999px;
  background: var(--materin-accent-soft);
  color: var(--materin-accent);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
}

.materin-learn-pill--stage {
  border-color: var(--materin-border);
  background: var(--materin-surface-3);
  color: var(--materin-text-muted);
}

.materin-learn-dayhead__title {
  margin: 0 0 10px;
  color: var(--materin-text);
  font-size: 34px;
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: -0.01em;
}

.materin-learn-dayhead__sub {
  margin: 0;
  max-width: 640px;
  color: var(--materin-text-muted);
  font-size: 15px;
  line-height: 1.7;
}

/* --- 动效舞台：玻璃卡片，页面视觉锚点 ------------------------------- */
.materin-learn-stage {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 26px;
  min-height: 340px;
  margin: 0 0 36px;
  padding: 36px 32px;
  border: 1px solid var(--materin-glass-border);
  border-radius: 20px;
  background:
    radial-gradient(110% 80% at 18% 0%, var(--materin-accent-soft), transparent 58%),
    var(--materin-surface-2);
  box-shadow: var(--materin-shadow);
  overflow: hidden;
}

.materin-learn-stage__hook {
  margin: 0;
  color: var(--materin-text);
  font-size: 18px;
  font-weight: 650;
  letter-spacing: 0.01em;
  text-align: center;
}

/* --- 动效模板 · counter --------------------------------------------- */
.materin-learn-counter {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 30px;
}

.materin-learn-counter__chips {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  max-width: 600px;
}

.materin-learn-counter__chip {
  padding: 10px 15px;
  border: 1px solid var(--materin-accent-border);
  border-radius: 12px;
  background: var(--materin-glass-bg-subtle, var(--materin-surface-3));
  box-shadow: var(--materin-shadow);
  color: var(--materin-text);
  font-size: 18px;
  font-weight: 550;
  opacity: 0;
  transform: translateY(16px) scale(0.88);
  animation: materin-learn-pop 0.55s cubic-bezier(0.2, 0.9, 0.3, 1.25) forwards;
}

.materin-learn-counter__chip--en {
  border-color: var(--materin-border);
  font-family: var(--materin-font-mono, ui-monospace, SFMono-Regular, Menlo, monospace);
  font-size: 15px;
}

.materin-learn-counter__count {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.materin-learn-counter__num {
  min-width: 96px;
  color: var(--materin-accent);
  font-size: 72px;
  font-weight: 750;
  font-variant-numeric: tabular-nums;
  text-align: center;
  line-height: 1;
  text-shadow: 0 0 32px var(--materin-accent-soft);
}

.materin-learn-counter__label {
  color: var(--muted);
  font-size: 13.5px;
  letter-spacing: 0.04em;
}

.materin-learn-counter__swap {
  display: flex;
  gap: 10px;
}

.materin-learn-counter__swap button {
  padding: 6px 16px;
  border: 1px solid var(--materin-border);
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font-size: 12.5px;
  cursor: pointer;
  transition: all var(--materin-duration-fast, 0.15s) var(--materin-ease-standard, ease);
}

.materin-learn-counter__swap button:hover {
  border-color: var(--materin-accent-border);
  color: var(--materin-text);
}

.materin-learn-counter__swap button.is-active {
  border-color: transparent;
  background: var(--materin-accent);
  color: var(--materin-on-accent);
  font-weight: 600;
}

.materin-learn-counter__note {
  margin: 0;
  color: var(--muted);
  font-size: 12.5px;
  text-align: center;
}

@keyframes materin-learn-pop {
  0% { opacity: 0; transform: translateY(16px) scale(0.88); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes materin-learn-winfill-pop {
  from { transform: translateY(8px) scale(0.85); }
  to { transform: none; }
}

/* --- 动效模板 · similarity ------------------------------------------ */
.materin-learn-sim {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 26px;
  width: 100%;
}

.materin-learn-sim__field {
  position: relative;
  width: 100%;
  max-width: 560px;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--materin-border);
  border-radius: 18px;
  background:
    radial-gradient(90% 110% at 80% 10%, var(--materin-accent-soft), transparent 60%),
    var(--materin-surface-3);
  overflow: hidden;
}

.materin-learn-sim__dot {
  position: absolute;
  transform: translate(-50%, -50%);
  padding: 7px 14px;
  border: 1px solid var(--materin-accent-border);
  border-radius: 999px;
  background: var(--materin-surface-2);
  box-shadow: var(--materin-shadow);
  color: var(--materin-text);
  font-size: 15px;
  font-weight: 600;
  opacity: 0;
  animation: materin-learn-pop 0.55s cubic-bezier(0.2, 0.9, 0.3, 1.25) forwards;
}

.materin-learn-sim__link {
  position: absolute;
  height: 1.5px;
  transform-origin: 0 0;
  background: linear-gradient(90deg, var(--materin-accent), color-mix(in srgb, var(--materin-accent) 25%, transparent));
  opacity: 0;
  transition: opacity 0.5s ease;
}

.materin-learn-sim__link.is-best {
  background: linear-gradient(90deg, var(--materin-accent), var(--materin-accent));
  height: 2.5px;
}

.materin-learn-sim__readout {
  display: flex;
  align-items: baseline;
  gap: 16px;
}

.materin-learn-sim__pair {
  color: var(--materin-text);
  font-size: 19px;
  font-weight: 650;
}

.materin-learn-sim__score {
  min-width: 108px;
  color: var(--materin-accent);
  font-size: 52px;
  font-weight: 750;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  text-shadow: 0 0 32px var(--materin-accent-soft);
}

.materin-learn-sim__note {
  margin: 0;
  color: var(--muted);
  font-size: 12.5px;
  text-align: center;
}

/* --- 动效模板 · spectrum（温度与采样） ------------------------------- */
.materin-learn-spectrum {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  width: 100%;
  max-width: 620px;
}

.materin-learn-spectrum__phrase {
  padding: 10px 26px;
  border: 1px solid var(--materin-accent-border);
  border-radius: 999px;
  background: var(--materin-glass-bg-subtle, var(--materin-surface-3));
  box-shadow: var(--materin-shadow);
  color: var(--materin-text);
  font-size: 22px;
  font-weight: 650;
  letter-spacing: 0.02em;
  transition: background var(--materin-duration-fast, 0.15s) ease;
}

.materin-learn-spectrum__phrase.is-hit {
  background: var(--materin-accent-soft);
}

.materin-learn-spectrum__bars {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
}

.materin-learn-spectrum__row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 3px 10px;
  border-radius: 12px;
  transition: background var(--materin-duration-fast, 0.15s) ease;
}

.materin-learn-spectrum__row.is-hit {
  background: var(--materin-surface-3);
}

.materin-learn-spectrum__word {
  min-width: 58px;
  color: var(--materin-text);
  font-size: 17px;
  font-weight: 600;
  text-align: right;
}

.materin-learn-spectrum__track {
  flex: 1;
  height: 16px;
  border-radius: 999px;
  background: var(--materin-surface-3);
  overflow: hidden;
}

.materin-learn-spectrum__bar {
  height: 100%;
  width: 0;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--materin-accent), color-mix(in srgb, var(--materin-accent) 55%, transparent));
  transition: width 0.7s cubic-bezier(0.2, 0.9, 0.3, 1);
}

.materin-learn-spectrum__val {
  min-width: 56px;
  color: var(--materin-text-muted);
  font-family: var(--materin-font-mono, ui-monospace, SFMono-Regular, Menlo, monospace);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

.materin-learn-spectrum__dial {
  display: flex;
  gap: 10px;
}

.materin-learn-spectrum__dial button {
  padding: 6px 16px;
  border: 1px solid var(--materin-border);
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font-family: var(--materin-font-mono, ui-monospace, SFMono-Regular, Menlo, monospace);
  font-size: 12.5px;
  cursor: pointer;
  transition: all var(--materin-duration-fast, 0.15s) var(--materin-ease-standard, ease);
}

.materin-learn-spectrum__dial button:hover {
  border-color: var(--materin-accent-border);
  color: var(--materin-text);
}

.materin-learn-spectrum__dial button.is-active {
  border-color: transparent;
  background: var(--materin-accent);
  color: var(--materin-on-accent);
  font-weight: 600;
}

.materin-learn-spectrum__note {
  margin: 0;
  color: var(--muted);
  font-size: 12.5px;
  text-align: center;
}

.materin-learn-counter__num.is-done {
  animation: materin-learn-breathe 2.6s ease-in-out infinite;
}

@keyframes materin-learn-breathe {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.8; }
}

/* --- 动效模板 · windowfill（上下文窗口预算条） ------------------------ */
.materin-learn-winfill {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 22px;
  width: 100%;
  max-width: 640px;
}

.materin-learn-winfill__legend {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 18px;
}

.materin-learn-winfill__legend-item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--materin-text-muted);
  font-size: 12.5px;
  letter-spacing: 0.03em;
}

.materin-learn-winfill__legend-item::before {
  content: "";
  width: 11px;
  height: 11px;
  border-radius: 4px;
  border: 1px solid var(--materin-border);
}

.materin-learn-winfill__legend-item--sys::before { background: var(--materin-accent-soft); border-color: var(--materin-accent-border); }
.materin-learn-winfill__legend-item--doc::before { background: var(--materin-accent); }
.materin-learn-winfill__legend-item--hist::before { background: var(--materin-surface-3); border-color: var(--materin-accent-border); }
.materin-learn-winfill__legend-item--reply::before { background: var(--materin-ok-soft, var(--materin-surface-2)); border-color: var(--materin-ok); }

.materin-learn-winfill__grid {
  display: grid;
  grid-template-columns: repeat(8, 44px);
  gap: 8px;
  justify-content: center;
}

.materin-learn-winfill__cell {
  width: 44px;
  height: 44px;
  border: 1px solid var(--materin-border);
  border-radius: 10px;
  transform: translateY(6px) scale(0.9);
  animation: materin-learn-winfill-pop 0.45s cubic-bezier(0.2, 0.9, 0.3, 1.2) both;
}

.materin-learn-winfill__cell--sys { border-color: var(--materin-accent-border); background: var(--materin-accent-soft); }
.materin-learn-winfill__cell--doc { border-color: var(--materin-accent); background: var(--materin-accent); }
.materin-learn-winfill__cell--hist { border-color: var(--materin-accent-border); background: var(--materin-surface-3); }
.materin-learn-winfill__cell--reply { border-color: var(--materin-ok); background: var(--materin-ok-soft, var(--materin-surface-2)); }
.materin-learn-winfill__cell--free { border-style: dashed; background: transparent; opacity: 0.55; transform: none; animation: none; }
.materin-learn-winfill__cell--free::before { content: ""; }

.materin-learn-winfill__readout {
  display: flex;
  justify-content: center;
}

.materin-learn-winfill__cutrow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 26px;
}

.materin-learn-winfill__cut-cell {
  width: 30px;
  height: 22px;
  border: 1px dashed var(--materin-warn);
  border-radius: 7px;
  background: transparent;
  opacity: 0.75;
  transform: translateY(4px) scale(0.9);
  animation: materin-learn-winfill-pop 0.4s ease both;
}

.materin-learn-winfill__cut-label {
  margin-left: 8px;
  color: var(--materin-warn);
  font-size: 12.5px;
  letter-spacing: 0.03em;
}

.materin-learn-winfill__turn {
  display: flex;
  align-items: baseline;
  gap: 4px;
  color: var(--materin-text-muted);
  font-size: 14px;
  letter-spacing: 0.02em;
}

.materin-learn-winfill__turn-no {
  color: var(--materin-text);
  font-size: 20px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.materin-learn-winfill__note {
  margin: 0;
  color: var(--muted);
  font-size: 12.5px;
  text-align: center;
  max-width: 560px;
}

/* --- 动效模板 · descent（损失曲线下坡） -------------------------------- */
.materin-learn-descent {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 22px;
  width: 100%;
  max-width: 640px;
}

.materin-learn-descent__field {
  position: relative;
  width: 100%;
  height: 240px;
  border: 1px solid var(--materin-glass-border);
  border-radius: var(--materin-radius-lg);
  background: var(--materin-glass-bg-subtle);
  box-shadow: var(--materin-shadow);
  overflow: hidden;
}

.materin-learn-descent__plot {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.materin-learn-descent__axis {
  stroke: var(--materin-border-strong);
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
}

.materin-learn-descent__curve {
  fill: none;
  stroke: var(--materin-accent);
  stroke-width: 2.5;
  vector-effect: non-scaling-stroke;
  stroke-linejoin: round;
  stroke-linecap: round;
}

.materin-learn-descent__ball {
  position: absolute;
  width: 16px;
  height: 16px;
  margin: -8px 0 0 -8px;
  border-radius: 50%;
  background: var(--materin-accent);
  box-shadow: var(--materin-shadow), 0 0 12px var(--materin-accent-soft);
}

.materin-learn-descent__readout {
  display: flex;
  align-items: baseline;
  gap: 8px;
  color: var(--materin-text-muted);
  font-size: 14px;
  letter-spacing: 0.02em;
}

.materin-learn-descent__epoch {
  font-variant-numeric: tabular-nums;
}

.materin-learn-descent__loss {
  color: var(--materin-text);
  font-size: 30px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  min-width: 76px;
  text-align: right;
}

.materin-learn-descent__loss-tag {
  color: var(--materin-text-muted);
  font-size: 12.5px;
}

.materin-learn-descent__note {
  margin: 0;
  color: var(--muted);
  font-size: 12.5px;
  text-align: center;
  max-width: 560px;
}

/* --- 动效模板 · attn（注意力权重分配） -------------------------------- */
.materin-learn-attn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  width: 100%;
  max-width: 560px;
}

.materin-learn-attn__tokens {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}

.materin-learn-attn__token {
  padding: 5px 12px;
  border: 1px solid var(--materin-border);
  border-radius: 999px;
  background: var(--materin-surface-2);
  color: var(--materin-text-muted);
  font-size: 13.5px;
  font-weight: 600;
  transform: scale(1);
  transition: transform var(--materin-duration-normal, 0.3s) ease, color var(--materin-duration-normal, 0.3s) ease, border-color var(--materin-duration-normal, 0.3s) ease, background var(--materin-duration-normal, 0.3s) ease;
}

.materin-learn-attn__token--q {
  border-color: var(--materin-accent-border);
  background: var(--materin-accent-soft);
  color: var(--materin-accent);
  transform: scale(1.12);
}

.materin-learn-attn__rows {
  display: flex;
  flex-direction: column;
  gap: 7px;
  width: 100%;
}

.materin-learn-attn__col {
  display: grid;
  grid-template-columns: 72px 1fr 58px;
  align-items: center;
  gap: 10px;
}

.materin-learn-attn__col .materin-learn-attn__token {
  justify-self: start;
  padding: 3px 10px;
  font-size: 12.5px;
}

.materin-learn-attn__track {
  height: 18px;
  border-radius: 6px;
  background: var(--materin-surface-3);
  overflow: hidden;
}

.materin-learn-attn__bar {
  height: 100%;
  border-radius: 6px;
  background: linear-gradient(90deg, var(--materin-accent), color-mix(in srgb, var(--materin-accent) 55%, transparent));
}

.materin-learn-attn__bar.is-top {
  background: linear-gradient(90deg, var(--materin-accent-strong, var(--materin-accent)), var(--materin-accent));
  box-shadow: 0 0 14px var(--materin-accent-soft);
}

.materin-learn-attn__val {
  color: var(--materin-text-muted);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.materin-learn-attn__readout {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.materin-learn-attn__q {
  color: var(--materin-text-muted);
  font-size: 13px;
  letter-spacing: 0.02em;
}

.materin-learn-attn__score {
  color: var(--materin-accent);
  font-size: 30px;
  font-weight: 750;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  text-shadow: 0 0 28px var(--materin-accent-soft);
}

.materin-learn-attn__note {
  margin: 0;
  color: var(--muted);
  font-size: 12.5px;
  text-align: center;
  max-width: 560px;
}

/* --- 动效模板 · flow（预训练流水线收缩） ------------------------------ */
.materin-learn-flow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  width: 100%;
  max-width: 560px;
}

.materin-learn-flow__rows {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
}

.materin-learn-flow__row {
  --flow-n: 1;
  --flow-p: 1;
  display: grid;
  grid-template-columns: 96px 1fr auto;
  align-items: center;
  gap: 10px;
}

.materin-learn-flow__tag {
  color: var(--materin-text-muted);
  font-size: 12.5px;
  font-weight: 600;
  text-align: right;
  white-space: nowrap;
}

/* 格子轨道：--flow-p 由 JS 驱动（0→1），宽度从满格收缩到 --flow-n/12 */
.materin-learn-flow__cells {
  display: flex;
  justify-content: flex-start;
  gap: 4px;
  width: calc((100% - 8px) * (1 - var(--flow-p, 1)) + (100% - 8px) * var(--flow-n, 1) / 12 + 4px);
  min-width: 26px;
  overflow: hidden;
  border-radius: 8px;
  background: var(--materin-surface-3);
}

.materin-learn-flow__cell {
  flex: 1;
  height: 16px;
  min-width: 18px;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--materin-accent), color-mix(in srgb, var(--materin-accent) 55%, transparent));
  transform: translateY(0) scale(1);
  animation: materin-learn-flow-pop 0.3s var(--materin-ease-standard, ease) backwards;
}

@keyframes materin-learn-flow-pop {
  from { transform: translateY(6px) scale(0.6); }
  to { transform: translateY(0) scale(1); }
}

.materin-learn-flow__row--clean .materin-learn-flow__cell {
  background: linear-gradient(90deg, var(--materin-accent-strong, var(--materin-accent)), var(--materin-accent));
}

.materin-learn-flow__row--base .materin-learn-flow__cell {
  height: 22px;
  border-radius: 6px;
  box-shadow: 0 0 16px var(--materin-accent-soft);
}

.materin-learn-flow__row.is-done .materin-learn-flow__num {
  color: var(--materin-accent);
}

.materin-learn-flow__num {
  color: var(--materin-text-muted);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  transition: color var(--materin-duration-normal, 0.3s) ease;
}

.materin-learn-flow__note {
  margin: 0;
  color: var(--muted);
  font-size: 12.5px;
  text-align: center;
  max-width: 560px;
}

/* --- 讲解区：编号卡片 ------------------------------------------------ */
.materin-learn-sections {
  display: grid;
  gap: 16px;
  margin-bottom: 32px;
  counter-reset: materin-learn-sec;
}

.materin-learn-section {
  position: relative;
  padding: 20px 22px 20px 58px;
  border: 1px solid var(--materin-border);
  border-radius: 16px;
  background: var(--materin-surface-2);
  counter-increment: materin-learn-sec;
}

.materin-learn-section::before {
  content: counter(materin-learn-sec, decimal-leading-zero);
  position: absolute;
  left: 20px;
  top: 22px;
  color: var(--materin-accent);
  font-family: var(--materin-font-mono, ui-monospace, monospace);
  font-size: 13px;
  font-weight: 700;
  opacity: 0.9;
}

.materin-learn-section__h {
  margin: 0 0 8px;
  color: var(--materin-text);
  font-size: 15px;
  font-weight: 650;
}

.materin-learn-section__p {
  margin: 0 0 10px;
  color: var(--materin-text-muted);
  font-size: 14px;
  line-height: 1.8;
}

.materin-learn-section__deep {
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--materin-accent-border);
  color: var(--materin-text-muted);
  font-size: 13.5px;
  line-height: 1.8;
}

/* 标注块：实例 / 误区 */
.materin-learn-callout {
  margin-top: 14px;
  padding: 13px 16px;
  border: 1px solid var(--materin-border);
  border-left-width: 3px;
  border-radius: 12px;
  background: var(--materin-surface-3);
}

.materin-learn-callout--example { border-left-color: var(--materin-accent); }
.materin-learn-callout--misconception { border-left-color: var(--materin-warn); }

.materin-learn-callout__h {
  margin: 0 0 5px;
  color: var(--materin-text);
  font-size: 12.5px;
  font-weight: 650;
  letter-spacing: 0.05em;
}

.materin-learn-callout__p {
  margin: 0;
  color: var(--materin-text-muted);
  font-size: 13.5px;
  line-height: 1.75;
}

/* --- 动手任务 / 沉淀 ------------------------------------------------- */
.materin-learn-action {
  position: relative;
  padding: 20px 22px;
  border: 1px solid var(--materin-accent-border);
  border-radius: 16px;
  background:
    radial-gradient(120% 140% at 85% 0%, var(--materin-accent-soft), transparent 55%),
    var(--materin-surface-2);
  margin-bottom: 16px;
}

.materin-learn-action__h,
.materin-learn-takeaway__h {
  margin: 0 0 7px;
  color: var(--materin-text);
  font-size: 14.5px;
  font-weight: 650;
}

.materin-learn-action__p,
.materin-learn-takeaway__p {
  margin: 0;
  color: var(--materin-text);
  font-size: 14px;
  line-height: 1.75;
}

.materin-learn-takeaway {
  padding: 20px 22px;
  border: 1px solid var(--materin-border);
  border-radius: 16px;
  background: var(--materin-surface-3);
  margin-bottom: 24px;
}

/* --- 路线图（index） ------------------------------------------------- */
.materin-learn-map {
  display: grid;
  gap: 14px;
}

.materin-learn-map__stage {
  position: relative;
  padding: 22px 24px;
  border: 1px solid var(--materin-border);
  border-radius: 18px;
  background: var(--materin-surface-2);
  transition: border-color var(--materin-duration-normal, 0.25s) ease;
}

.materin-learn-map__stage:hover { border-color: var(--materin-accent-border); }

.materin-learn-map__stage.is-current {
  border-color: var(--materin-accent-border);
  background:
    radial-gradient(120% 120% at 85% 0%, var(--materin-accent-soft), transparent 55%),
    var(--materin-surface-2);
  box-shadow: var(--materin-shadow);
}

.materin-learn-map__stage-h {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 8px;
}

.materin-learn-map__stage-no {
  color: var(--materin-accent);
  font-family: var(--materin-font-mono, ui-monospace, monospace);
  font-size: 14px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.materin-learn-map__stage-name {
  color: var(--materin-text);
  font-size: 16.5px;
  font-weight: 650;
}

.materin-learn-map__stage-days {
  margin-left: auto;
  color: var(--muted);
  font-family: var(--materin-font-mono, ui-monospace, monospace);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}

.materin-learn-map__stage-p {
  margin: 0;
  color: var(--materin-text-muted);
  font-size: 13.5px;
  line-height: 1.7;
  text-decoration: none;
}

a.materin-learn-map__stage-p:hover { color: var(--materin-text); text-decoration: none; }

/* --- 上下页 ---------------------------------------------------------- */
.materin-learn-pager {
  display: flex;
  justify-content: space-between;
  max-width: 820px;
  margin: 0 auto;
  padding: 4px 24px 12px;
}

.materin-learn-pager a {
  padding: 8px 16px;
  border: 1px solid var(--materin-border);
  border-radius: 999px;
  background: var(--materin-surface-2);
  color: var(--materin-text-muted);
  font-size: 13px;
  text-decoration: none;
  transition: all var(--materin-duration-fast, 0.15s) ease;
}

.materin-learn-pager a:hover {
  border-color: var(--materin-accent-border);
  color: var(--materin-text);
  text-decoration: none;
}

.materin-learn-pager a[aria-disabled="true"] {
  color: var(--materin-text-faint, var(--muted));
  opacity: 0.45;
  pointer-events: none;
}

/* ==========================================================================
   竖屏录屏版（stage）：1080×1920，只有动效舞台
   ========================================================================== */
.materin-learn-body-day.is-stage .materin-learn-header,
.materin-learn-body-day.is-stage .materin-learn-footer,
.materin-learn-body-day.is-stage .materin-learn-pager {
  display: none;
}

.materin-learn-body-day.is-stage .materin-learn-main {
  max-width: 1080px;
  padding: 0;
}

.materin-learn-body-day.is-stage .materin-learn-stage {
  width: 1080px;
  height: 1920px;
  margin: 0 auto;
  border: none;
  border-radius: 0;
  gap: 70px;
  padding: 130px 80px;
  box-shadow: none;
}

.materin-learn-body-day.is-stage .materin-learn-stage__hook { font-size: 54px; }
.materin-learn-body-day.is-stage .materin-learn-counter__chip { font-size: 46px; padding: 20px 32px; border-radius: 22px; }
.materin-learn-body-day.is-stage .materin-learn-counter__chip--en { font-size: 38px; }
.materin-learn-body-day.is-stage .materin-learn-counter__num { font-size: 200px; min-width: 300px; }
.materin-learn-body-day.is-stage .materin-learn-counter__label { font-size: 34px; }
.materin-learn-body-day.is-stage .materin-learn-counter__swap button { font-size: 30px; padding: 14px 36px; }
.materin-learn-body-day.is-stage .materin-learn-counter__note { font-size: 28px; max-width: 840px; }

.materin-learn-body-day.is-stage .materin-learn-sim { gap: 56px; }
.materin-learn-body-day.is-stage .materin-learn-sim__field { max-width: 900px; border-radius: 30px; }
.materin-learn-body-day.is-stage .materin-learn-sim__dot { font-size: 34px; padding: 14px 30px; }
.materin-learn-body-day.is-stage .materin-learn-sim__pair { font-size: 40px; }
.materin-learn-body-day.is-stage .materin-learn-sim__score { font-size: 110px; min-width: 240px; }
.materin-learn-body-day.is-stage .materin-learn-sim__note { font-size: 28px; max-width: 840px; }

.materin-learn-body-day.is-stage .materin-learn-spectrum { gap: 52px; }
.materin-learn-body-day.is-stage .materin-learn-spectrum__phrase { font-size: 54px; padding: 22px 56px; border-radius: 999px; }
.materin-learn-body-day.is-stage .materin-learn-spectrum__bars { gap: 26px; }
.materin-learn-body-day.is-stage .materin-learn-spectrum__row { gap: 26px; padding: 6px 22px; }
.materin-learn-body-day.is-stage .materin-learn-spectrum__word { font-size: 38px; min-width: 130px; }
.materin-learn-body-day.is-stage .materin-learn-spectrum__track { height: 34px; }
.materin-learn-body-day.is-stage .materin-learn-spectrum__val { font-size: 28px; min-width: 120px; }
.materin-learn-body-day.is-stage .materin-learn-spectrum__dial button { font-size: 30px; padding: 14px 36px; }
.materin-learn-body-day.is-stage .materin-learn-spectrum__note { font-size: 28px; max-width: 840px; }

.materin-learn-body-day.is-stage .materin-learn-descent__note { font-size: 28px; max-width: 840px; }

.materin-learn-body-day.is-stage .materin-learn-attn { gap: 46px; max-width: 940px; }
.materin-learn-body-day.is-stage .materin-learn-attn__tokens { gap: 16px; }
.materin-learn-body-day.is-stage .materin-learn-attn__token { font-size: 30px; padding: 14px 28px; }
.materin-learn-body-day.is-stage .materin-learn-attn__col { grid-template-columns: 220px 1fr 140px; gap: 22px; }
.materin-learn-body-day.is-stage .materin-learn-attn__col .materin-learn-attn__token { font-size: 26px; padding: 10px 22px; }
.materin-learn-body-day.is-stage .materin-learn-attn__track { height: 36px; border-radius: 12px; }
.materin-learn-body-day.is-stage .materin-learn-attn__bar { border-radius: 12px; }
.materin-learn-body-day.is-stage .materin-learn-attn__val { font-size: 26px; min-width: 130px; }
.materin-learn-body-day.is-stage .materin-learn-attn__q { font-size: 30px; }
.materin-learn-body-day.is-stage .materin-learn-attn__score { font-size: 76px; min-width: 300px; }
.materin-learn-body-day.is-stage .materin-learn-attn__note { font-size: 28px; max-width: 840px; }

.materin-learn-body-day.is-stage .materin-learn-flow { gap: 56px; max-width: 940px; }
.materin-learn-body-day.is-stage .materin-learn-flow__rows { gap: 26px; }
.materin-learn-body-day.is-stage .materin-learn-flow__row { grid-template-columns: 260px 1fr 260px; gap: 26px; }
.materin-learn-body-day.is-stage .materin-learn-flow__tag { font-size: 30px; }
.materin-learn-body-day.is-stage .materin-learn-flow__cell { height: 40px; min-width: 44px; border-radius: 10px; animation-duration: 0.6s; }
.materin-learn-body-day.is-stage .materin-learn-flow__row--base .materin-learn-flow__cell { height: 56px; border-radius: 14px; }
.materin-learn-body-day.is-stage .materin-learn-flow__num { font-size: 30px; }
.materin-learn-body-day.is-stage .materin-learn-flow__note { font-size: 28px; max-width: 840px; }

.materin-learn-body-day.is-stage .materin-learn-winfill { gap: 60px; max-width: 1000px; }
.materin-learn-body-day.is-stage .materin-learn-winfill__legend { gap: 16px 40px; }
.materin-learn-body-day.is-stage .materin-learn-winfill__legend-item { font-size: 30px; }
.materin-learn-body-day.is-stage .materin-learn-winfill__legend-item::before { width: 26px; height: 26px; border-radius: 8px; }
.materin-learn-body-day.is-stage .materin-learn-winfill__grid { grid-template-columns: repeat(8, 96px); gap: 18px; }
.materin-learn-body-day.is-stage .materin-learn-winfill__cell { width: 96px; height: 96px; border-radius: 20px; animation-duration: 0.6s; }
.materin-learn-body-day.is-stage .materin-learn-winfill__turn { font-size: 34px; }
.materin-learn-body-day.is-stage .materin-learn-winfill__turn-no { font-size: 52px; }
.materin-learn-body-day.is-stage .materin-learn-winfill__note { font-size: 28px; max-width: 840px; }
.materin-learn-body-day.is-stage .materin-learn-winfill__cutrow { gap: 14px; min-height: 56px; }
.materin-learn-body-day.is-stage .materin-learn-winfill__cut-cell { width: 64px; height: 48px; border-radius: 14px; }
.materin-learn-body-day.is-stage .materin-learn-winfill__cut-label { font-size: 30px; margin-left: 18px; }

.materin-learn-body-day.is-stage .materin-learn-fab { gap: 40px; max-width: 900px; }
.materin-learn-body-day.is-stage .materin-learn-fab__question { font-size: 30px; }
.materin-learn-body-day.is-stage .materin-learn-fab__round { gap: 12px; }
.materin-learn-body-day.is-stage .materin-learn-fab__q { font-size: 26px; }
.materin-learn-body-day.is-stage .materin-learn-fab__row { grid-template-columns: 220px 1fr; }
.materin-learn-body-day.is-stage .materin-learn-fab__card { font-size: 26px; }
.materin-learn-body-day.is-stage .materin-learn-fab__note { font-size: 28px; max-width: 840px; }

.materin-learn-body-day.is-stage .materin-learn-lora { gap: 34px; max-width: 900px; }
.materin-learn-body-day.is-stage .materin-learn-lora__wall { gap: 8px; padding: 26px; border-radius: 26px; }
.materin-learn-body-day.is-stage .materin-learn-lora__cell { height: 30px; border-radius: 8px; animation-duration: 0.05s; }
.materin-learn-body-day.is-stage .materin-learn-lora__wall-tag,
.materin-learn-body-day.is-stage .materin-learn-lora__patch-tag { font-size: 28px; }
.materin-learn-body-day.is-stage .materin-learn-lora__patch { padding: 20px 34px; gap: 26px; border-radius: 22px; }
.materin-learn-body-day.is-stage .materin-learn-lora__mini { width: 40px; height: 68px; border-radius: 12px; animation-duration: 0.7s; }
.materin-learn-body-day.is-stage .materin-learn-lora__pct { font-size: 96px; }
.materin-learn-body-day.is-stage .materin-learn-lora__pct-label { font-size: 30px; }
.materin-learn-body-day.is-stage .materin-learn-lora__note { font-size: 28px; max-width: 840px; }

.materin-learn-body-day.is-stage .materin-learn-quant { gap: 56px; max-width: 960px; }
.materin-learn-body-day.is-stage .materin-learn-quant__rows { gap: 40px; }
.materin-learn-body-day.is-stage .materin-learn-quant__row { gap: 30px; }
.materin-learn-body-day.is-stage .materin-learn-quant__tag { font-size: 44px; min-width: 190px; }
.materin-learn-body-day.is-stage .materin-learn-quant__cell { height: 52px; border-radius: 12px; animation-duration: 0.05s; }
.materin-learn-body-day.is-stage .materin-learn-quant__gb-tag { font-size: 44px; min-width: 240px; }
.materin-learn-body-day.is-stage .materin-learn-quant__q { font-size: 40px; min-width: 170px; }
.materin-learn-body-day.is-stage .materin-learn-quant__gb { font-size: 120px; }
.materin-learn-body-day.is-stage .materin-learn-quant__gb-label { font-size: 40px; }
.materin-learn-body-day.is-stage .materin-learn-quant__note { font-size: 28px; max-width: 840px; }

.materin-learn-body-day.is-stage .materin-learn-dayhead { display: none; }
.materin-learn-body-day.is-stage .materin-learn-sections,
.materin-learn-body-day.is-stage .materin-learn-action,
.materin-learn-body-day.is-stage .materin-learn-takeaway { display: none; }

.materin-learn-body-day.is-stage .materin-learn-counter__chip { animation-duration: 0.7s; }

@media (prefers-reduced-motion: reduce) {
  .materin-learn-counter__chip { animation: none; opacity: 1; transform: none; }
  .materin-learn-counter__num.is-done { animation: none; }
  .materin-learn-sim__dot { animation: none; opacity: 1; transform: translate(-50%, -50%); }
  .materin-learn-sim__link { opacity: 1; transition: none; }
  .materin-learn-spectrum__bar { transition: none; }
  .materin-learn-winfill__cell { animation: none; transform: none; }
}

/* --- 首页进度与今日卡 ------------------------------------------------ */
.materin-learn-progress { margin-top: 22px; }

.materin-learn-progress__label {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 13.5px;
}

.materin-learn-progress__num {
  color: var(--materin-text);
  font-family: var(--materin-font-mono, ui-monospace, monospace);
  font-size: 20px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.materin-learn-progress__track {
  height: 8px;
  border-radius: 999px;
  background: var(--materin-surface-3);
  overflow: hidden;
}

.materin-learn-progress__bar {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--materin-accent), color-mix(in srgb, var(--materin-accent) 60%, transparent));
  transition: width var(--materin-duration-normal, 0.3s) ease;
}

.materin-learn-today {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 18px;
  padding: 16px 20px;
  border: 1px solid var(--materin-accent-border);
  border-radius: 14px;
  background: radial-gradient(120% 160% at 90% 0%, var(--materin-accent-soft), transparent 55%), var(--materin-surface-2);
  text-decoration: none;
}

.materin-learn-today:hover { border-color: var(--materin-accent); text-decoration: none; }

.materin-learn-today__kicker {
  color: var(--materin-accent);
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.materin-learn-today__title {
  color: var(--materin-text);
  font-size: 15.5px;
  font-weight: 650;
}

.materin-learn-today__go {
  margin-left: auto;
  color: var(--muted);
  font-size: 13px;
  white-space: nowrap;
}

/* 阶段卡内的每日条目 */
.materin-learn-map__day {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 0;
  border-top: 1px solid var(--materin-border);
  text-decoration: none;
}

.materin-learn-map__day:hover .materin-learn-map__day-title { color: var(--materin-text); }

.materin-learn-map__day-no {
  color: var(--materin-accent);
  font-family: var(--materin-font-mono, ui-monospace, monospace);
  font-size: 12px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  min-width: 34px;
}

.materin-learn-map__day-title {
  color: var(--materin-text-muted);
  font-size: 13.5px;
  transition: color var(--materin-duration-fast, 0.15s) ease;
}

.materin-learn-map__more {
  margin: 6px 0 0;
  padding-top: 7px;
  border-top: 1px solid var(--materin-border);
  color: var(--muted);
  font-size: 12px;
}

/* duel：偏好对决（第 8 天 RLHF）——左右两个回答，人类点亮胜者，胜率爬升 */
.materin-learn-duel {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  width: 100%;
  max-width: 560px;
}

.materin-learn-duel__prompt {
  padding: 8px 18px;
  border: 1px solid var(--materin-glass-border);
  border-radius: 999px;
  background: var(--materin-glass-bg-subtle);
  color: var(--materin-text);
  font-size: 14px;
  font-weight: 600;
}

.materin-learn-duel__rounds {
  display: flex;
  flex-direction: column;
  gap: 14px;
  width: 100%;
}

.materin-learn-duel__round {
  display: grid;
  grid-template-columns: 34px 1fr 1fr;
  align-items: stretch;
  gap: 10px;
}

.materin-learn-duel__round-no {
  align-self: center;
  color: var(--materin-text-faint);
  font-family: var(--materin-font-mono, ui-monospace, monospace);
  font-size: 12px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.materin-learn-duel__card {
  padding: 12px 14px;
  border: 1px solid var(--materin-glass-border);
  border-radius: 10px;
  background: var(--materin-glass-bg-subtle);
  color: var(--materin-text-muted);
  font-size: 13.5px;
  line-height: var(--materin-line-height-normal);
  box-shadow: var(--materin-shadow);
  transform: translateY(0) scale(1);
  transition: border-color var(--materin-duration-normal) ease,
    background var(--materin-duration-normal) ease,
    color var(--materin-duration-normal) ease;
  animation: materin-learn-duel-pop 0.3s var(--materin-ease-standard, ease) backwards;
}

@keyframes materin-learn-duel-pop {
  from { transform: translateY(8px) scale(0.96); }
  to { transform: translateY(0) scale(1); }
}

/* 人类点亮胜者：亮边 + 语气变化；败者按下去 */
.materin-learn-duel__round.is-picked .materin-learn-duel__card--b {
  border-color: var(--materin-ok-border);
  background: var(--materin-ok-soft);
  color: var(--materin-text);
}

.materin-learn-duel__round.is-picked .materin-learn-duel__card--a {
  opacity: 0.55;
  transform: scale(0.97);
}

.materin-learn-duel__meter {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 10px;
  width: 100%;
}

.materin-learn-duel__num {
  color: var(--materin-accent);
  font-family: var(--materin-font-mono, ui-monospace, monospace);
  font-size: 15px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.materin-learn-duel__track {
  height: 8px;
  border-radius: 999px;
  background: var(--materin-surface-3);
  overflow: hidden;
}

.materin-learn-duel__bar {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--materin-accent), color-mix(in srgb, var(--materin-accent) 55%, transparent));
  transition: width 0.6s var(--materin-ease-standard, ease);
}

.materin-learn-duel__meter-label {
  color: var(--materin-text-muted);
  font-size: 12px;
  white-space: nowrap;
}

.materin-learn-duel__note {
  margin: 0;
  color: var(--materin-text-faint);
  font-size: 12.5px;
  text-align: center;
}

/* fabricate：幻觉——同一台打分机，三种结局 */
.materin-learn-fab {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  width: 100%;
  max-width: 560px;
}

.materin-learn-fab__question {
  padding: 8px 18px;
  border: 1px solid var(--materin-glass-border);
  border-radius: 999px;
  background: var(--materin-glass-bg-subtle);
  color: var(--materin-text);
  font-size: 14px;
  font-weight: 600;
}

.materin-learn-fab__rounds {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
}

.materin-learn-fab__round {
  padding: 12px 14px;
  border: 1px solid var(--materin-glass-border);
  border-radius: 12px;
  background: var(--materin-glass-bg-subtle);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.materin-learn-fab__q {
  color: var(--materin-text-muted);
  font-size: 13px;
  font-weight: 600;
}

.materin-learn-fab__row {
  display: grid;
  grid-template-columns: 86px 1fr;
  align-items: center;
  gap: 10px;
}

.materin-learn-fab__mark {
  padding: 4px 0;
  border: 1px solid var(--materin-border);
  border-radius: 8px;
  color: var(--materin-text-muted);
  font-family: var(--materin-font-mono, ui-monospace, monospace);
  font-size: 11.5px;
  font-weight: 700;
  text-align: center;
  transform: scale(0.9);
  transition: transform var(--materin-duration-normal) var(--materin-ease-standard, ease),
    border-color var(--materin-duration-normal) ease,
    background var(--materin-duration-normal) ease,
    color var(--materin-duration-normal) ease;
}

.materin-learn-fab__card {
  padding: 10px 12px;
  border: 1px solid var(--materin-glass-border);
  border-radius: 10px;
  background: var(--materin-glass-bg-subtle);
  color: var(--materin-text-muted);
  font-size: 13.5px;
  line-height: var(--materin-line-height-normal);
  box-shadow: var(--materin-shadow);
  transform: translateY(0) scale(1);
  animation: materin-learn-fab-pop 0.3s var(--materin-ease-standard, ease) backwards;
}

@keyframes materin-learn-fab-pop {
  from { transform: translateY(8px) scale(0.96); }
  to { transform: translateY(0) scale(1); }
}

.materin-learn-fab__label {
  color: var(--materin-text-faint);
  font-size: 12px;
}

/* 判定揭示：编造走警示色，答对走认可色，创作走中性强调 */
.materin-learn-fab__round.is-revealed .materin-learn-fab__mark {
  transform: scale(1);
}

.materin-learn-fab__round--fab.is-revealed .materin-learn-fab__mark {
  border-color: var(--materin-warn-border);
  background: var(--materin-warn-soft);
  color: var(--materin-warn);
}

.materin-learn-fab__round--ok.is-revealed .materin-learn-fab__mark {
  border-color: var(--materin-ok-border);
  background: var(--materin-ok-soft);
  color: var(--materin-ok);
}

.materin-learn-fab__round--art.is-revealed .materin-learn-fab__mark {
  border-color: var(--materin-accent-border);
  background: var(--materin-accent-soft);
  color: var(--materin-accent);
}

.materin-learn-fab__round--fab.is-revealed .materin-learn-fab__card {
  border-color: var(--materin-warn-border);
  color: var(--materin-text);
}

.materin-learn-fab__round--ok.is-revealed .materin-learn-fab__card {
  border-color: var(--materin-ok-border);
  color: var(--materin-text);
}

.materin-learn-fab__note {
  margin: 0;
  color: var(--materin-text-faint);
  font-size: 12.5px;
  text-align: center;
}

/* lora：冻结权重墙 + 可训练 LoRA 补丁（第 10 天）。入场只动 transform，不依赖 opacity。 */
.materin-learn-lora {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  width: 100%;
  max-width: 620px;
}

.materin-learn-lora__wall-tag,
.materin-learn-lora__patch-tag {
  color: var(--materin-text-faint);
  font-family: var(--materin-font-mono, ui-monospace, monospace);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.materin-learn-lora__wall {
  display: grid;
  grid-template-columns: repeat(20, 1fr);
  gap: 4px;
  width: 100%;
  max-width: 560px;
  padding: 14px;
  border: 1px solid var(--materin-glass-border);
  border-radius: 16px;
  background: var(--materin-glass-bg-subtle);
  box-shadow: var(--materin-shadow);
}

.materin-learn-lora__cell {
  height: 14px;
  border-radius: 4px;
  border: 1px solid var(--materin-border);
  background: var(--materin-surface-2);
  transform: translateY(0) scale(1);
  animation: materin-learn-lora-cell 0.4s var(--materin-ease-standard, ease) backwards;
}

.materin-learn-lora__cell--frozen {
  border-color: var(--materin-border);
  background: var(--materin-surface-3);
  opacity: 0.55;
}

.materin-learn-lora__cell--train {
  border-color: var(--materin-accent-border);
  background: var(--materin-accent-soft);
}

@keyframes materin-learn-lora-cell {
  from { transform: translateY(8px) scale(0.9); }
  to { transform: translateY(0) scale(1); }
}

.materin-learn-lora__patch {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 16px;
  border: 1px solid var(--materin-accent-border);
  border-radius: 14px;
  background: var(--materin-glass-bg-subtle);
  box-shadow: var(--materin-shadow);
  transition: border-color var(--materin-duration-normal) ease,
    background var(--materin-duration-normal) ease;
}

.materin-learn-lora__lane {
  display: flex;
  gap: 6px;
}

.materin-learn-lora__mini {
  width: 18px;
  height: 34px;
  border-radius: 6px;
  border: 1px solid var(--materin-accent-border);
  background: var(--materin-accent-soft);
  transform: translateY(0) scale(1);
  animation: materin-learn-lora-mini 0.4s var(--materin-ease-standard, ease) backwards;
}

.materin-learn-lora__mini--a { border-radius: 6px 12px 6px 6px; }
.materin-learn-lora__mini--b { border-radius: 12px 6px 6px 6px; }

@keyframes materin-learn-lora-mini {
  from { transform: translateY(6px) scale(0.85); }
  to { transform: translateY(0) scale(1); }
}

.materin-learn-lora__patch.is-live {
  border-color: var(--materin-accent);
  background: var(--materin-accent-soft);
}

.materin-learn-lora__patch.is-live .materin-learn-lora__mini {
  border-color: var(--materin-accent);
}

.materin-learn-lora__readout {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.materin-learn-lora__pct {
  color: var(--materin-accent);
  font-family: var(--materin-font-mono, ui-monospace, monospace);
  font-size: 34px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.materin-learn-lora__pct-label {
  color: var(--materin-text-muted);
  font-size: 13px;
}

.materin-learn-lora__note {
  margin: 0;
  color: var(--materin-text-faint);
  font-size: 12.5px;
  text-align: center;
}

@media (prefers-reduced-motion: reduce) {
  .materin-learn-lora__cell,
  .materin-learn-lora__mini { animation: none; transform: none; }
}

/* quant：同一组权重的三种精度存储（第 11 天）。入场只动 transform，不依赖 opacity。 */.materin-learn-quant {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
}

.materin-learn-quant__rows {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
}

.materin-learn-quant__row {
  display: flex;
  align-items: center;
  gap: 14px;
}

.materin-learn-quant__tag {
  min-width: 64px;
  color: var(--materin-text-muted);
  font-family: var(--materin-font-mono, ui-monospace, monospace);
  font-size: 13px;
  font-weight: 700;
}

.materin-learn-quant__row--int4 .materin-learn-quant__tag { color: var(--materin-accent); }

/* 三档各自的视觉身份：FP16 完整精度、INT8 过渡、INT4 目标档 */
.materin-learn-quant__row--fp16 .materin-learn-quant__gb-tag { color: var(--materin-text-muted); }
.materin-learn-quant__row--int8 .materin-learn-quant__gb-tag { color: var(--materin-text); }
.materin-learn-quant__row--int4 .materin-learn-quant__gb-tag { color: var(--materin-accent); }

.materin-learn-quant__cells {
  --quant-bytes: 2;
  display: flex;
  gap: 6px;
  flex: 1;
  justify-content: flex-start;
}

.materin-learn-quant__cell {
  width: calc(44px * var(--quant-bytes) / 2);
  height: 20px;
  border-radius: 5px;
  border: 1px solid var(--materin-border);
  background: var(--materin-surface-3);
  transform: translateY(0) scale(1);
  animation: materin-learn-quant-cell 0.4s var(--materin-ease-standard, ease) backwards;
}

.materin-learn-quant__row--fp16 .materin-learn-quant__cell {
  border-color: var(--materin-accent-border);
  background: var(--materin-accent-soft);
}

.materin-learn-quant__row--int4.is-done .materin-learn-quant__cell {
  border-color: var(--materin-accent);
}

@keyframes materin-learn-quant-cell {
  from { transform: translateY(6px) scale(0.85); }
  to { transform: translateY(0) scale(1); }
}

.materin-learn-quant__gb-tag {
  min-width: 72px;
  text-align: right;
  color: var(--materin-text);
  font-family: var(--materin-font-mono, ui-monospace, monospace);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

.materin-learn-quant__q {
  min-width: 56px;
  text-align: right;
  color: var(--materin-text-faint);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}

.materin-learn-quant__readout {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.materin-learn-quant__gb {
  color: var(--materin-accent);
  font-family: var(--materin-font-mono, ui-monospace, monospace);
  font-size: 34px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.materin-learn-quant__gb.is-done { color: var(--materin-accent); }

.materin-learn-quant__gb-label {
  color: var(--materin-text-muted);
  font-size: 13px;
}

.materin-learn-quant__note {
  margin: 0;
  color: var(--materin-text-faint);
  font-size: 12.5px;
  text-align: center;
  max-width: 640px;
}

@media (prefers-reduced-motion: reduce) {
  .materin-learn-quant__cell { animation: none; transform: none; }
}

/* distill：老师软分布 → 学生软分布（第 12 天）。入场只动 transform，不依赖 opacity。 */
.materin-learn-distill {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
}

.materin-learn-distill__q {
  padding: 8px 18px;
  border: 1px solid var(--materin-glass-border);
  border-radius: 999px;
  background: var(--materin-glass-bg-subtle);
  color: var(--materin-text);
  font-size: 14px;
  font-weight: 600;
}

.materin-learn-distill__panel {
  width: 100%;
  padding: 18px 20px;
  border: 1px solid var(--materin-glass-border);
  border-radius: 16px;
  background: var(--materin-glass-bg-subtle);
  box-shadow: var(--materin-shadow);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.materin-learn-distill__bars {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
}

.materin-learn-distill__row {
  display: grid;
  grid-template-columns: 92px 1fr 56px;
  align-items: center;
  gap: 12px;
}

.materin-learn-distill__word {
  color: var(--materin-text-muted);
  font-size: 13.5px;
  font-weight: 600;
}

.materin-learn-distill__track {
  height: 26px;
  border-radius: 8px;
  background: var(--materin-surface-3);
  overflow: hidden;
}

.materin-learn-distill__bar {
  height: 100%;
  border-radius: 8px;
  background: var(--materin-surface-2);
  transform: translateX(0) scaleX(1);
  transform-origin: left center;
  animation: materin-learn-distill-bar 0.4s var(--materin-ease-standard, ease) backwards;
  transition: background var(--materin-duration-normal) ease;
}

/* 老师标尺：常规强调色；切到学生后条形回落、暗知识条转为警示色叙事 */
.materin-learn-distill__row.is-teacher .materin-learn-distill__bar {
  background: linear-gradient(90deg, var(--materin-accent), color-mix(in srgb, var(--materin-accent) 55%, transparent));
}

.materin-learn-distill__row--dark .materin-learn-distill__word { color: var(--materin-text); }

@keyframes materin-learn-distill-bar {
  from { transform: translateX(-6px) scaleX(0.9); }
  to { transform: translateX(0) scaleX(1); }
}

.materin-learn-distill__num {
  color: var(--materin-text);
  font-family: var(--materin-font-mono, ui-monospace, monospace);
  font-size: 13px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.materin-learn-distill__readout {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.materin-learn-distill__who {
  padding: 4px 14px;
  border: 1px solid var(--materin-border);
  border-radius: 999px;
  color: var(--materin-accent);
  font-family: var(--materin-font-mono, ui-monospace, monospace);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.materin-learn-distill.is-student .materin-learn-distill__who {
  border-color: var(--materin-accent-border);
  background: var(--materin-accent-soft);
}

.materin-learn-distill__note {
  margin: 0;
  color: var(--materin-text-faint);
  font-size: 12.5px;
  text-align: center;
  max-width: 640px;
}

@media (prefers-reduced-motion: reduce) {
  .materin-learn-distill__bar { animation: none; transform: none; }
}

/* 竖版舞台（?stage=1）：distill 放大 */
.materin-learn-body-day.is-stage .materin-learn-distill { gap: 56px; max-width: 960px; }
.materin-learn-body-day.is-stage .materin-learn-distill__q { font-size: 30px; }
.materin-learn-body-day.is-stage .materin-learn-distill__bars { gap: 34px; }
.materin-learn-body-day.is-stage .materin-learn-distill__row { grid-template-columns: 220px 1fr 150px; gap: 26px; }
.materin-learn-body-day.is-stage .materin-learn-distill__word { font-size: 34px; }
.materin-learn-body-day.is-stage .materin-learn-distill__track { height: 48px; border-radius: 14px; }
.materin-learn-body-day.is-stage .materin-learn-distill__num { font-size: 34px; min-width: 130px; }
.materin-learn-body-day.is-stage .materin-learn-distill__who { font-size: 28px; padding: 10px 32px; }
.materin-learn-body-day.is-stage .materin-learn-distill__note { font-size: 28px; max-width: 840px; }

/* kvcache：预填充（橙，一次算好）+ 逐词追加（绿，每步 1 格）+ 不缓存重算警示（第 14 天）。
   入场只动 transform，不依赖 opacity。 */
.materin-learn-kv {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  width: 100%;
  max-width: 680px;
  margin: 0 auto;
}

.materin-learn-kv__tag {
  color: var(--materin-text-muted);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.03em;
  align-self: flex-start;
}

.materin-learn-kv__row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  width: 100%;
  min-height: 48px;
  padding: 8px;
  border: 1px solid var(--materin-glass-border);
  border-radius: 14px;
  background: var(--materin-glass-bg-subtle);
}

.materin-learn-kv__row--prompt { border-color: var(--materin-accent-border); }
.materin-learn-kv__row--gen { border-style: dashed; }

.materin-learn-kv__cell {
  width: 40px;
  height: 32px;
  border: 1px solid var(--materin-border);
  border-radius: 8px;
  transform: translateY(6px) scale(0.9);
  animation: materin-learn-kv-pop 0.45s cubic-bezier(0.2, 0.9, 0.3, 1.2) both;
}

.materin-learn-kv__cell--prompt {
  border-color: var(--materin-accent);
  background: linear-gradient(180deg, var(--materin-accent), color-mix(in srgb, var(--materin-accent) 72%, transparent));
}

.materin-learn-kv__cell--gen {
  border-color: var(--materin-ok);
  background: var(--materin-ok-soft, var(--materin-surface-2));
  animation: none;
  transform: translateY(6px) scale(0.9);
  transition: transform 0.4s var(--materin-ease-standard, ease);
}

.materin-learn-kv__cell--gen.is-in {
  transform: translateY(0) scale(1);
  animation: materin-learn-kv-pop 0.45s cubic-bezier(0.2, 0.9, 0.3, 1.2) both;
}

@keyframes materin-learn-kv-pop {
  from { transform: translateY(6px) scale(0.9); }
  to { transform: translateY(0) scale(1); }
}

.materin-learn-kv__readout {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
}

.materin-learn-kv__step {
  color: var(--materin-text-muted);
  font-size: 13px;
  letter-spacing: 0.02em;
}

.materin-learn-kv__cached {
  color: var(--materin-text);
  font-family: var(--materin-font-mono, ui-monospace, monospace);
  font-size: 26px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.materin-learn-kv__cached-label {
  color: var(--materin-text-faint);
  font-size: 12.5px;
}

.materin-learn-kv__redo {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 16px;
  border: 1px dashed var(--materin-warn);
  border-radius: 999px;
  transition: opacity var(--materin-duration-normal) ease;
}

.materin-learn-kv__redo.is-calm { opacity: 0.8; }

.materin-learn-kv__redo-num {
  color: var(--materin-warn);
  font-family: var(--materin-font-mono, ui-monospace, monospace);
  font-size: 18px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.materin-learn-kv__redo-num.is-hot { text-decoration: underline dotted; text-underline-offset: 4px; }

.materin-learn-kv__redo-label {
  color: var(--materin-text-faint);
  font-size: 12px;
}

.materin-learn-kv__note {
  margin: 0;
  color: var(--materin-text-faint);
  font-size: 12.5px;
  text-align: center;
  max-width: 640px;
}

@media (prefers-reduced-motion: reduce) {
  .materin-learn-kv__cell,
  .materin-learn-kv__cell--gen.is-in { animation: none; transform: none; }
}

/* 竖版舞台（?stage=1）：kvcache 放大 */
.materin-learn-body-day.is-stage .materin-learn-kv { gap: 30px; max-width: 900px; }
.materin-learn-body-day.is-stage .materin-learn-kv__tag { font-size: 26px; align-self: center; }
.materin-learn-body-day.is-stage .materin-learn-kv__row { min-height: 84px; border-radius: 24px; gap: 14px; }
.materin-learn-body-day.is-stage .materin-learn-kv__cell { width: 68px; height: 56px; border-radius: 14px; }
.materin-learn-body-day.is-stage .materin-learn-kv__step { font-size: 30px; }
.materin-learn-body-day.is-stage .materin-learn-kv__cached { font-size: 56px; }
.materin-learn-body-day.is-stage .materin-learn-kv__cached-label { font-size: 28px; }
.materin-learn-body-day.is-stage .materin-learn-kv__redo-num { font-size: 40px; }
.materin-learn-body-day.is-stage .materin-learn-kv__redo-label { font-size: 26px; }
.materin-learn-body-day.is-stage .materin-learn-kv__note { font-size: 28px; max-width: 840px; }

/* atlas：概念地图（第 15 天）——三条水平主线带 + 站点 + 连线 + 跨线桥 */
.materin-learn-atlas {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
}

.materin-learn-atlas__field {
  position: relative;
  width: 100%;
  height: 400px;
  border: 1px solid var(--materin-glass-border);
  border-radius: 18px;
  background: var(--materin-glass-bg-subtle);
  box-shadow: var(--materin-shadow);
  overflow: hidden;
}

.materin-learn-atlas__band {
  position: absolute;
  left: 0;
  width: 100%;
  pointer-events: none;
}

.materin-learn-atlas__band--read {
  top: 0;
  height: 33.4%;
  border-bottom: 1px dashed var(--materin-accent-border);
}

.materin-learn-atlas__band--learn {
  top: 33.4%;
  height: 33.3%;
  border-bottom: 1px dashed var(--materin-ok-border);
}

.materin-learn-atlas__band--use {
  top: 66.7%;
  height: 33.3%;
}

/* 主线标签：横排图例（字段下方），不与任何站点卡片同层相撞 */
.materin-learn-atlas__legend {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 18px;
}

.materin-learn-atlas__legend-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--materin-text-muted);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.materin-learn-atlas__legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 3px;
}

.materin-learn-atlas__legend-item--read .materin-learn-atlas__legend-dot { background: var(--materin-accent); }
.materin-learn-atlas__legend-item--learn .materin-learn-atlas__legend-dot { background: var(--materin-ok); }
.materin-learn-atlas__legend-item--use .materin-learn-atlas__legend-dot { background: var(--materin-secondary); }
.materin-learn-atlas__legend-item--bridge .materin-learn-atlas__legend-dot {
  background: transparent;
  border-top: 2px dashed var(--materin-warn);
  border-radius: 0;
  height: 2px;
}

.materin-learn-atlas__node {
  position: absolute;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1px;
  padding: 6px 10px;
  border: 1px solid var(--materin-border);
  border-radius: 10px;
  background: var(--materin-surface-3);
  box-shadow: var(--materin-shadow);
  transform: translate(-50%, -50%);
  animation: materin-learn-atlas-pop 0.45s cubic-bezier(0.2, 0.9, 0.3, 1.2) backwards;
}

.materin-learn-atlas__node--read { border-color: var(--materin-accent-border); }
.materin-learn-atlas__node--learn { border-color: var(--materin-ok-border); }
.materin-learn-atlas__node--use { border-color: var(--materin-secondary-border); }

.materin-learn-atlas__node-d {
  color: var(--materin-text-faint);
  font-family: var(--materin-font-mono, ui-monospace, monospace);
  font-size: 10px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.materin-learn-atlas__node-name {
  color: var(--materin-text);
  font-size: 12.5px;
  font-weight: 600;
  white-space: nowrap;
}

.materin-learn-atlas__edge {
  position: absolute;
  height: 2px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--materin-accent) 55%, transparent);
  opacity: 0;
  transform-origin: 0 50%;
  pointer-events: none;
}

.materin-learn-atlas__edge.is-lit {
  background: var(--materin-accent);
  box-shadow: 0 0 6px var(--materin-accent-soft);
}

.materin-learn-atlas__edge--bridge {
  height: 0;
  border-top: 2px dashed var(--materin-warn);
  background: transparent;
}

.materin-learn-atlas__edge--bridge.is-lit {
  background: transparent;
  box-shadow: none;
}

@keyframes materin-learn-atlas-pop {
  from { transform: translate(-50%, -50%) translateY(8px) scale(0.9); }
  to { transform: translate(-50%, -50%) translateY(0) scale(1); }
}

.materin-learn-atlas__note {
  margin: 0;
  color: var(--materin-text-faint);
  font-size: 12.5px;
  text-align: center;
  max-width: 640px;
}

@media (prefers-reduced-motion: reduce) {
  .materin-learn-atlas__node { animation: none; }
}

/* 竖版舞台（?stage=1）：atlas 放大 */
.materin-learn-body-day.is-stage .materin-learn-atlas { max-width: 1000px; gap: 30px; }
.materin-learn-body-day.is-stage .materin-learn-atlas__field { height: 760px; border-radius: 30px; }
.materin-learn-body-day.is-stage .materin-learn-atlas__legend { gap: 16px 44px; }
.materin-learn-body-day.is-stage .materin-learn-atlas__legend-item { font-size: 30px; gap: 12px; }
.materin-learn-body-day.is-stage .materin-learn-atlas__legend-dot { width: 22px; height: 22px; border-radius: 6px; }
.materin-learn-body-day.is-stage .materin-learn-atlas__legend-item--bridge .materin-learn-atlas__legend-dot { height: 4px; border-top-width: 4px; }
.materin-learn-body-day.is-stage .materin-learn-atlas__node { padding: 16px 22px; border-radius: 18px; }
.materin-learn-body-day.is-stage .materin-learn-atlas__node-d { font-size: 22px; }
.materin-learn-body-day.is-stage .materin-learn-atlas__node-name { font-size: 30px; }
.materin-learn-body-day.is-stage .materin-learn-atlas__note { font-size: 28px; max-width: 900px; }

/* moe：专家混合（第 17 天）——token 行 + 专家车道（门控条）+ 三格 readout。
   车道填充只动 transform:scaleX，top 专家点亮只改背景描边，入口格初始可见，
   截图任意帧均可读；循环重播。 */
.materin-learn-moe {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  width: 100%;
  max-width: 680px;
  margin: 0 auto;
}

.materin-learn-moe__tag {
  color: var(--materin-text-muted);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.03em;
  align-self: flex-start;
}

.materin-learn-moe__tokens {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  width: 100%;
  min-height: 48px;
  padding: 8px;
  border: 1px solid var(--materin-glass-border);
  border-radius: 14px;
  background: var(--materin-glass-bg-subtle);
}

.materin-learn-moe__token {
  display: inline-flex;
  align-items: center;
  padding: 0 12px;
  height: 32px;
  border: 1px solid var(--materin-border);
  border-radius: 8px;
  background: var(--materin-surface-2);
  color: var(--materin-text-muted);
  font-size: 13.5px;
  transform: translateY(6px) scale(0.9);
  animation: materin-learn-moe-pop 0.45s cubic-bezier(0.2, 0.9, 0.3, 1.2) both;
  transition: background var(--materin-duration-fast, 0.15s) ease,
              color var(--materin-duration-fast, 0.15s) ease,
              border-color var(--materin-duration-fast, 0.15s) ease,
              transform var(--materin-duration-fast, 0.15s) ease;
}

.materin-learn-moe__token.is-live {
  border-color: var(--materin-accent);
  background: var(--materin-accent-soft);
  color: var(--materin-accent);
  font-weight: 700;
  transform: translateY(-2px) scale(1.06);
}

@keyframes materin-learn-moe-pop {
  from { transform: translateY(6px) scale(0.9); }
  to { transform: translateY(0) scale(1); }
}

.materin-learn-moe__lanes {
  display: flex;
  flex-direction: column;
  gap: 7px;
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--materin-glass-border);
  border-radius: 16px;
  background: var(--materin-glass-bg-subtle);
  box-shadow: var(--materin-shadow);
}

.materin-learn-moe__lane {
  display: grid;
  grid-template-columns: 76px 1fr 44px;
  align-items: center;
  gap: 10px;
  padding: 2px 6px;
  border: 1px solid transparent;
  border-radius: 10px;
  transition: background var(--materin-duration-fast, 0.15s) ease,
              border-color var(--materin-duration-fast, 0.15s) ease;
}

.materin-learn-moe__lane.is-top {
  border-color: var(--materin-accent-border);
  background: var(--materin-accent-soft);
}

.materin-learn-moe__lane-no {
  color: var(--materin-text-muted);
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
}

.materin-learn-moe__lane.is-top .materin-learn-moe__lane-no { color: var(--materin-accent); }

.materin-learn-moe__lane-meter {
  display: block;
  height: 14px;
  border-radius: 7px;
  background: var(--materin-surface-3);
  overflow: hidden;
}

.materin-learn-moe__lane-fill {
  display: block;
  height: 100%;
  border-radius: 7px;
  background: var(--materin-surface-2);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.5s var(--materin-ease-standard, ease),
              background var(--materin-duration-normal, 0.3s) ease;
}

.materin-learn-moe__lane.is-top .materin-learn-moe__lane-fill {
  background: linear-gradient(90deg, var(--materin-accent), color-mix(in srgb, var(--materin-accent) 55%, transparent));
}

.materin-learn-moe__lane-score {
  color: var(--materin-text-faint);
  font-family: var(--materin-font-mono, ui-monospace, monospace);
  font-size: 12px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.materin-learn-moe__lane.is-top .materin-learn-moe__lane-score { color: var(--materin-accent); }

.materin-learn-moe__readout {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

.materin-learn-moe__stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 8px 16px;
  border: 1px solid var(--materin-glass-border);
  border-radius: 12px;
  background: var(--materin-surface-2);
}

.materin-learn-moe__stat-num {
  color: var(--materin-accent);
  font-size: 20px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.materin-learn-moe__stat-cap {
  color: var(--materin-text-muted);
  font-size: 11.5px;
  font-weight: 600;
}

.materin-learn-moe__note {
  margin: 0;
  color: var(--materin-text-faint);
  font-size: 12.5px;
  text-align: center;
  max-width: 640px;
}

@media (prefers-reduced-motion: reduce) {
  .materin-learn-moe__token { animation: none; transform: none; }
}

/* 竖版舞台（?stage=1）：moe 放大 */
.materin-learn-body-day.is-stage .materin-learn-moe { gap: 30px; max-width: 920px; }
.materin-learn-body-day.is-stage .materin-learn-moe__tag { font-size: 26px; }
.materin-learn-body-day.is-stage .materin-learn-moe__tokens { min-height: 84px; border-radius: 24px; gap: 14px; }
.materin-learn-body-day.is-stage .materin-learn-moe__token { height: 56px; padding: 0 22px; border-radius: 14px; font-size: 30px; }
.materin-learn-body-day.is-stage .materin-learn-moe__lanes { gap: 14px; padding: 26px 28px; border-radius: 26px; }
.materin-learn-body-day.is-stage .materin-learn-moe__lane { grid-template-columns: 170px 1fr 84px; gap: 18px; }
.materin-learn-body-day.is-stage .materin-learn-moe__lane-no { font-size: 26px; }
.materin-learn-body-day.is-stage .materin-learn-moe__lane-meter { height: 28px; border-radius: 14px; }
.materin-learn-body-day.is-stage .materin-learn-moe__lane-fill { border-radius: 14px; }
.materin-learn-body-day.is-stage .materin-learn-moe__lane-score { font-size: 26px; }
.materin-learn-body-day.is-stage .materin-learn-moe__stat-num { font-size: 44px; }
.materin-learn-body-day.is-stage .materin-learn-moe__stat-cap { font-size: 24px; }
.materin-learn-body-day.is-stage .materin-learn-moe__note { font-size: 28px; max-width: 900px; }

/* loop：生成循环（第 16 天）——提示词行 + 生成行 + 五步链条 + 圈数表。
   动效只动 transform/opacity，循环重播；入口格初始可见（防截图停在透明帧）。 */
.materin-learn-loop {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  width: 100%;
  max-width: 680px;
  margin: 0 auto;
}

.materin-learn-loop__tag {
  color: var(--materin-text-muted);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.03em;
  align-self: flex-start;
}

.materin-learn-loop__row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  width: 100%;
  min-height: 48px;
  padding: 8px;
  border: 1px solid var(--materin-glass-border);
  border-radius: 14px;
  background: var(--materin-glass-bg-subtle);
}

.materin-learn-loop__row--prompt { border-color: var(--materin-accent-border); }
.materin-learn-loop__row--gen { border-style: dashed; }

.materin-learn-loop__cell {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 12px;
  height: 32px;
  border: 1px solid var(--materin-border);
  border-radius: 8px;
  font-size: 13.5px;
  color: var(--materin-text);
  transform: translateY(6px) scale(0.9);
  animation: materin-learn-loop-pop 0.45s cubic-bezier(0.2, 0.9, 0.3, 1.2) both;
}

.materin-learn-loop__cell--prompt {
  border-color: var(--materin-accent);
  background: linear-gradient(180deg, var(--materin-accent), color-mix(in srgb, var(--materin-accent) 72%, transparent));
  color: var(--materin-on-accent);
}

.materin-learn-loop__cell--gen {
  border-color: var(--materin-ok-border);
  background: var(--materin-ok-soft, var(--materin-surface-2));
  opacity: 0.999;
  transform: translateY(6px) scale(0.9);
  animation: none;
  transition: transform 0.4s var(--materin-ease-standard, ease), opacity 0.4s var(--materin-ease-standard, ease);
}

.materin-learn-loop__cell--gen.is-in {
  opacity: 1;
  transform: translateY(0) scale(1);
  animation: materin-learn-loop-pop 0.45s cubic-bezier(0.2, 0.9, 0.3, 1.2) both;
}

@keyframes materin-learn-loop-pop {
  from { transform: translateY(6px) scale(0.9); }
  to { transform: translateY(0) scale(1); }
}

.materin-learn-loop__steps {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.materin-learn-loop__step {
  display: inline-flex;
  align-items: center;
  height: 26px;
  padding: 0 12px;
  border: 1px solid var(--materin-glass-border);
  border-radius: 999px;
  background: var(--materin-surface-2);
  color: var(--materin-text-muted);
  font-size: 12px;
  font-weight: 600;
  transition: background var(--materin-duration-normal, 0.3s) ease,
              color var(--materin-duration-normal, 0.3s) ease,
              border-color var(--materin-duration-normal, 0.3s) ease,
              transform var(--materin-duration-fast, 0.15s) ease;
}

/* is-live/is-done 只改背景与描边（不动 opacity），截图任意帧都可读 */
.materin-learn-loop__step.is-live {
  border-color: var(--materin-accent);
  background: var(--materin-accent-soft);
  color: var(--materin-accent);
  transform: translateY(-2px) scale(1.06);
}

.materin-learn-loop__step.is-done {
  border-color: var(--materin-ok-border);
  background: var(--materin-ok-soft, var(--materin-surface-2));
  color: var(--materin-ok);
}

.materin-learn-loop__readout {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
}

.materin-learn-loop__lap {
  color: var(--materin-accent);
  font-size: 30px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  min-width: 44px;
  text-align: right;
}

.materin-learn-loop__lap.is-ticking { text-decoration: underline dotted; text-underline-offset: 5px; }

.materin-learn-loop__lap-label {
  color: var(--materin-text-muted);
  font-size: 12.5px;
  font-weight: 600;
}

.materin-learn-loop__cache {
  color: var(--materin-text-faint);
  font-size: 12px;
}

.materin-learn-loop__note {
  margin: 0;
  color: var(--materin-text-faint);
  font-size: 12.5px;
  text-align: center;
  max-width: 640px;
}

@media (prefers-reduced-motion: reduce) {
  .materin-learn-loop__cell,
  .materin-learn-loop__cell--gen.is-in { animation: none; transform: none; }
}

/* 竖版舞台（?stage=1）：loop 放大 */
.materin-learn-body-day.is-stage .materin-learn-loop { gap: 30px; max-width: 900px; }
.materin-learn-body-day.is-stage .materin-learn-loop__tag { font-size: 26px; align-self: center; }
.materin-learn-body-day.is-stage .materin-learn-loop__row { min-height: 84px; border-radius: 24px; gap: 14px; }
.materin-learn-body-day.is-stage .materin-learn-loop__cell { height: 56px; padding: 0 22px; border-radius: 14px; font-size: 30px; }
.materin-learn-body-day.is-stage .materin-learn-loop__steps { gap: 16px; }
.materin-learn-body-day.is-stage .materin-learn-loop__step { height: 48px; padding: 0 26px; border-radius: 999px; font-size: 26px; }
.materin-learn-body-day.is-stage .materin-learn-loop__lap { font-size: 56px; }
.materin-learn-body-day.is-stage .materin-learn-loop__lap-label { font-size: 28px; }
.materin-learn-body-day.is-stage .materin-learn-loop__cache { font-size: 24px; }
.materin-learn-body-day.is-stage .materin-learn-loop__note { font-size: 28px; max-width: 840px; }

/* fim：中间填充（第 18 天）——三行瓦片（前缀/待补/后缀）+ 光标 + 三格 readout。
   待补格只动 transform（scaleX 生长），初始可见不靠 opacity，循环重播。 */
.materin-learn-fim {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  width: 100%;
  max-width: 680px;
  margin: 0 auto;
}

.materin-learn-fim__tag {
  color: var(--materin-text-muted);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.03em;
  align-self: flex-start;
}

.materin-learn-fim__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-start;
  gap: 8px;
  width: 100%;
  min-height: 48px;
  padding: 8px;
  border: 1px solid var(--materin-glass-border);
  border-radius: 14px;
  background: var(--materin-glass-bg-subtle);
  transition: border-color var(--materin-duration-normal, 0.3s) ease,
              box-shadow var(--materin-duration-normal, 0.3s) ease;
}

.materin-learn-fim__row--prefix { border-color: var(--materin-accent-border); }
.materin-learn-fim__row--middle { border-style: dashed; }
.materin-learn-fim__row--suffix.is-lit {
  border-color: var(--materin-ok);
  box-shadow: var(--materin-shadow);
}

.materin-learn-fim__cell {
  display: inline-flex;
  align-items: center;
  padding: 0 12px;
  height: 32px;
  border: 1px solid var(--materin-border);
  border-radius: 8px;
  background: var(--materin-surface-2);
  color: var(--materin-text-muted);
  font-family: var(--materin-font-mono, ui-monospace, monospace);
  font-size: 13px;
  white-space: nowrap;
}

.materin-learn-fim__cell--prefix {
  border-color: var(--materin-accent-border);
  transform: translateY(6px) scale(0.9);
  animation: materin-learn-fim-pop 0.45s cubic-bezier(0.2, 0.9, 0.3, 1.2) both;
}

.materin-learn-fim__cell--suffix {
  transform: translateY(4px) scale(0.94);
  transition: transform 0.4s var(--materin-ease-standard, ease),
              border-color var(--materin-duration-normal, 0.3s) ease,
              color var(--materin-duration-normal, 0.3s) ease;
}

.materin-learn-fim__row--suffix.is-lit .materin-learn-fim__cell--suffix {
  border-color: var(--materin-ok);
  background: var(--materin-ok-soft, var(--materin-surface-2));
  color: var(--materin-ok);
  transform: translateY(0) scale(1);
}

.materin-learn-fim__cursor {
  width: 3px;
  height: 30px;
  border-radius: 2px;
  background: var(--materin-accent);
  transition: transform 0.25s var(--materin-ease-standard, ease),
              box-shadow 0.25s var(--materin-ease-standard, ease);
}

.materin-learn-fim__cursor.is-live {
  transform: scaleY(1.25);
  box-shadow: 0 0 12px color-mix(in srgb, var(--materin-accent) 65%, transparent);
}

.materin-learn-fim__cell--middle {
  border-color: var(--materin-ok);
  border-style: dashed;
  background: var(--materin-ok-soft, var(--materin-surface-2));
  color: var(--materin-ok);
  font-weight: 700;
  transform: scaleX(0.04);
  transform-origin: left center;
  transition: transform 0.35s cubic-bezier(0.2, 0.9, 0.3, 1.15);
}

.materin-learn-fim__cell--middle.is-in { transform: scaleX(1); }

@keyframes materin-learn-fim-pop {
  from { transform: translateY(6px) scale(0.9); }
  to { transform: translateY(0) scale(1); }
}

.materin-learn-fim__readout {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

.materin-learn-fim__stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 8px 16px;
  border: 1px solid var(--materin-glass-border);
  border-radius: 12px;
  background: var(--materin-surface-2);
}

.materin-learn-fim__stat-num {
  color: var(--materin-accent);
  font-size: 20px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.materin-learn-fim__stat-cap {
  color: var(--materin-text-muted);
  font-size: 11.5px;
  font-weight: 600;
}

.materin-learn-fim__note {
  margin: 0;
  color: var(--materin-text-faint);
  font-size: 12.5px;
  text-align: center;
  max-width: 640px;
}

@media (prefers-reduced-motion: reduce) {
  .materin-learn-fim__cell--prefix,
  .materin-learn-fim__cell--middle { animation: none; transition: none; }
  .materin-learn-fim__cell--middle { transform: scaleX(1); }
}

/* 竖版舞台（?stage=1）：fim 放大 */
.materin-learn-body-day.is-stage .materin-learn-fim { gap: 30px; max-width: 900px; }
.materin-learn-body-day.is-stage .materin-learn-fim__tag { font-size: 26px; }
.materin-learn-body-day.is-stage .materin-learn-fim__row { min-height: 92px; border-radius: 24px; gap: 14px; padding: 14px; }
.materin-learn-body-day.is-stage .materin-learn-fim__cell { height: 56px; padding: 0 22px; border-radius: 14px; font-size: 30px; }
.materin-learn-body-day.is-stage .materin-learn-fim__cursor { height: 52px; width: 5px; }
.materin-learn-body-day.is-stage .materin-learn-fim__stat-num { font-size: 44px; }
.materin-learn-body-day.is-stage .materin-learn-fim__stat-cap { font-size: 24px; }
.materin-learn-body-day.is-stage .materin-learn-fim__note { font-size: 28px; max-width: 840px; }

/* think：思维链（第 19 天）——上下两栏对照（直接回答 vs 先想后答）+ 判决行 +
   三格 readout。草稿格只动 transform（scaleY 生长），不依赖 opacity（导出/
   采样不会停在透明第一帧）；错格被划掉用 line-through，循环重播。 */
.materin-learn-think {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
}

.materin-learn-think__question {
  padding: 10px 20px;
  border: 1px solid var(--materin-accent-border);
  border-radius: 12px;
  background: var(--materin-accent-soft);
  color: var(--materin-accent);
  font-family: var(--materin-font-mono, ui-monospace, monospace);
  font-size: 15px;
  font-weight: 700;
}

.materin-learn-think__tag {
  color: var(--materin-text-muted);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.03em;
  align-self: flex-start;
}

.materin-learn-think__tag--think { color: var(--materin-accent); }

.materin-learn-think__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  width: 100%;
  min-height: 48px;
  padding: 8px;
  border: 1px solid var(--materin-glass-border);
  border-radius: 14px;
  background: var(--materin-glass-bg-subtle);
  transition: border-color var(--materin-duration-normal, 0.3s) ease,
              box-shadow var(--materin-duration-normal, 0.3s) ease;
}

.materin-learn-think__row--fast.is-rejected { border-color: var(--materin-error-border); }

.materin-learn-think__row--think { border-style: dashed; }
.materin-learn-think__row--think.is-in { border-color: var(--materin-accent-border); }

.materin-learn-think__cell {
  display: inline-flex;
  align-items: center;
  padding: 0 12px;
  height: 32px;
  border: 1px solid var(--materin-border);
  border-radius: 8px;
  background: var(--materin-surface-2);
  color: var(--materin-text-muted);
  font-family: var(--materin-font-mono, ui-monospace, monospace);
  font-size: 13px;
  white-space: nowrap;
}

.materin-learn-think__cell--fast {
  border-color: var(--materin-error-border);
  transform: translateY(6px) scale(0.9);
  animation: materin-learn-think-pop 0.45s cubic-bezier(0.2, 0.9, 0.3, 1.2) both;
}

.materin-learn-think__cell--draft {
  transform: translateY(8px) scaleY(0.2);
  transform-origin: center bottom;
  transition: transform 0.38s cubic-bezier(0.2, 0.9, 0.3, 1.15);
}

.materin-learn-think__cell--draft.is-in { transform: translateY(0) scaleY(1); }

.materin-learn-think__cell--bad { border-style: dashed; }

.materin-learn-think__cell--bad.is-struck {
  border-color: var(--materin-warn-border);
  background: var(--materin-warn-soft);
  color: var(--materin-warn);
  text-decoration: line-through;
}

.materin-learn-think__cell--ans {
  border-color: var(--materin-ok);
  background: var(--materin-ok-soft, var(--materin-surface-2));
  color: var(--materin-ok);
  font-weight: 700;
}

.materin-learn-think__verdict {
  align-self: flex-start;
  font-size: 13px;
  font-weight: 700;
  transform: translateX(-4px);
  opacity: 0;
  transition: opacity 0.35s var(--materin-ease-standard, ease),
              transform 0.35s var(--materin-ease-standard, ease);
}

.materin-learn-think__verdict.is-in { transform: translateX(0); opacity: 1; }

.materin-learn-think__verdict--bad { color: var(--materin-error); }
.materin-learn-think__verdict--good { color: var(--materin-ok); }

@keyframes materin-learn-think-pop {
  from { transform: translateY(6px) scale(0.9); }
  to { transform: translateY(0) scale(1); }
}

.materin-learn-think__readout {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

.materin-learn-think__stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 8px 16px;
  border: 1px solid var(--materin-glass-border);
  border-radius: 12px;
  background: var(--materin-surface-2);
}

.materin-learn-think__stat-num {
  color: var(--materin-accent);
  font-size: 20px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.materin-learn-think__stat-cap {
  color: var(--materin-text-muted);
  font-size: 11.5px;
  font-weight: 600;
}

.materin-learn-think__note {
  margin: 0;
  color: var(--materin-text-faint);
  font-size: 12.5px;
  text-align: center;
  max-width: 640px;
}

@media (prefers-reduced-motion: reduce) {
  .materin-learn-think__cell--fast { animation: none; }
  .materin-learn-think__cell--draft { transform: scaleY(1); transition: none; }
  .materin-learn-think__verdict { opacity: 1; transform: none; }
}

/* 竖版舞台（?stage=1）：think 放大 */
.materin-learn-body-day.is-stage .materin-learn-think { gap: 24px; max-width: 900px; }
.materin-learn-body-day.is-stage .materin-learn-think__question { font-size: 34px; padding: 16px 34px; border-radius: 20px; }
.materin-learn-body-day.is-stage .materin-learn-think__tag { font-size: 26px; }
.materin-learn-body-day.is-stage .materin-learn-think__row { min-height: 92px; border-radius: 24px; gap: 14px; padding: 14px; }
.materin-learn-body-day.is-stage .materin-learn-think__cell { height: 56px; padding: 0 22px; border-radius: 14px; font-size: 28px; }
.materin-learn-body-day.is-stage .materin-learn-think__verdict { font-size: 28px; }
.materin-learn-body-day.is-stage .materin-learn-think__stat-num { font-size: 44px; }
.materin-learn-body-day.is-stage .materin-learn-think__stat-cap { font-size: 24px; }
.materin-learn-body-day.is-stage .materin-learn-think__note { font-size: 28px; max-width: 840px; }

/* spec：推测解码（第 20 天）——草稿行 + 验证行同位对齐；格只动 transform，
   初始可见不靠 opacity（导出/采样不会停在透明第一帧）。 */
.materin-learn-spec {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
}

.materin-learn-spec__tag {
  color: var(--materin-text-muted);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.03em;
  align-self: flex-start;
}

.materin-learn-spec__tag--verify { color: var(--materin-accent); }

.materin-learn-spec__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  width: 100%;
  min-height: 56px;
  padding: 8px;
  border: 1px solid var(--materin-glass-border);
  border-radius: 14px;
  background: var(--materin-glass-bg-subtle);
  transition: border-color var(--materin-duration-normal, 0.3s) ease,
              box-shadow var(--materin-duration-normal, 0.3s) ease;
}

.materin-learn-spec__row--draft { border-color: var(--materin-accent-border); }
.materin-learn-spec__row--verify { border-style: dashed; }
.materin-learn-spec__row--verify.is-live {
  border-color: var(--materin-accent-border);
  box-shadow: var(--materin-shadow);
}

.materin-learn-spec__cell {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 34px;
  padding: 0 12px;
  border: 1px solid var(--materin-accent-border);
  border-radius: 10px;
  background: var(--materin-surface-2);
  color: var(--materin-text);
  font-family: var(--materin-font-mono, ui-monospace, monospace);
  font-size: 14px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  animation: materin-learn-spec-pop 0.45s cubic-bezier(0.2, 0.9, 0.3, 1.2) both;
}

.materin-learn-spec__cell--draft { border-color: var(--materin-border); background: var(--materin-surface-3); color: var(--materin-text-muted); }

.materin-learn-spec__cell--fix {
  display: none;
  border-color: var(--materin-warn-border);
  background: var(--materin-warn-soft);
  color: var(--materin-warn);
}

.materin-learn-spec__cell--fix.is-in { display: inline-flex; }

.materin-learn-spec__slot { display: inline-flex; }

.materin-learn-spec__slot .materin-learn-spec__cell--slot { transition: transform 0.3s var(--materin-ease-standard, ease), border-color 0.3s ease, background 0.3s ease, color 0.3s ease; }

.materin-learn-spec__slot.is-ok .materin-learn-spec__cell--slot {
  border-color: var(--materin-ok-border);
  background: var(--materin-ok-soft);
  color: var(--materin-ok);
}

.materin-learn-spec__slot.is-ok .materin-learn-spec__cell--slot::after {
  content: "✓";
  margin-left: 6px;
  font-size: 12px;
}

.materin-learn-spec__slot.is-re .materin-learn-spec__cell--slot {
  border-style: dashed;
  border-color: var(--materin-warn-border);
  background: transparent;
  color: var(--materin-warn);
  text-decoration: line-through;
}

.materin-learn-spec__verdict {
  align-self: flex-start;
  color: var(--materin-ok);
  font-size: 13px;
  font-weight: 700;
  transform: translateX(-4px) scaleY(0.6);
  transition: transform 0.35s var(--materin-ease-standard, ease);
}

.materin-learn-spec__verdict.is-in { transform: translateX(0) scaleY(1); }

@keyframes materin-learn-spec-pop {
  from { transform: translateY(6px) scale(0.9); }
  to { transform: translateY(0) scale(1); }
}

.materin-learn-spec__readout {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

.materin-learn-spec__stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 8px 16px;
  border: 1px solid var(--materin-glass-border);
  border-radius: 12px;
  background: var(--materin-surface-2);
}

.materin-learn-spec__stat-num {
  color: var(--materin-accent);
  font-size: 20px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.materin-learn-spec__stat-cap {
  color: var(--materin-text-muted);
  font-size: 11.5px;
  font-weight: 600;
}

.materin-learn-spec__note {
  margin: 0;
  color: var(--materin-text-faint);
  font-size: 12.5px;
  text-align: center;
  max-width: 640px;
}

@media (prefers-reduced-motion: reduce) {
  .materin-learn-spec__cell { animation: none; }
  .materin-learn-spec__verdict { transform: none; }
}

/* 竖版舞台（?stage=1）：spec 放大 */
.materin-learn-body-day.is-stage .materin-learn-spec { gap: 24px; max-width: 900px; }
.materin-learn-body-day.is-stage .materin-learn-spec__tag { font-size: 26px; }
.materin-learn-body-day.is-stage .materin-learn-spec__row { min-height: 104px; border-radius: 24px; gap: 14px; padding: 14px; }
.materin-learn-body-day.is-stage .materin-learn-spec__cell { height: 60px; padding: 0 24px; border-radius: 14px; font-size: 30px; }
.materin-learn-body-day.is-stage .materin-learn-spec__verdict { font-size: 28px; }
.materin-learn-body-day.is-stage .materin-learn-spec__stat-num { font-size: 44px; }
.materin-learn-body-day.is-stage .materin-learn-spec__stat-cap { font-size: 24px; }
.materin-learn-body-day.is-stage .materin-learn-spec__note { font-size: 28px; max-width: 840px; }

/* ===== batch（D21 连续批处理）：4 条请求 lane，GPU 逐列同算 ===== */
.materin-learn-batch {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
}

.materin-learn-batch__lanes {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
}

.materin-learn-batch__lane {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  min-height: 46px;
  padding: 7px 10px;
  border: 1px solid var(--materin-glass-border);
  border-radius: 12px;
  background: var(--materin-glass-bg-subtle);
  transition: border-color var(--materin-duration-normal, 0.3s) ease,
              box-shadow var(--materin-duration-normal, 0.3s) ease;
}

.materin-learn-batch__lane--idle { opacity: 0.55; }

.materin-learn-batch__lane--run {
  border-color: var(--materin-accent-border);
  box-shadow: var(--materin-shadow);
}

.materin-learn-batch__lane-tag {
  min-width: 118px;
  color: var(--materin-text-muted);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.materin-learn-batch__grid {
  display: flex;
  flex: 1;
  gap: 7px;
}

.materin-learn-batch__cell {
  --batch-f: 0;
  flex: 1;
  height: 30px;
  border: 1px solid var(--materin-border);
  border-radius: 8px;
  background: var(--materin-surface-2);
  transition: background 0.25s ease, border-color 0.25s ease;
}

.materin-learn-batch__cell--queue {
  border-style: dashed;
  background: transparent;
}

.materin-learn-batch__cell--live {
  border-color: var(--materin-accent-border);
  background: linear-gradient(90deg,
    color-mix(in srgb, var(--materin-accent) calc(var(--batch-f) * 55%), transparent),
    color-mix(in srgb, var(--materin-accent) calc(var(--batch-f) * 18%), transparent));
}

.materin-learn-batch__readout {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

.materin-learn-batch__stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 8px 16px;
  border: 1px solid var(--materin-glass-border);
  border-radius: 12px;
  background: var(--materin-surface-2);
}

.materin-learn-batch__stat-num {
  color: var(--materin-accent);
  font-size: 20px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.materin-learn-batch__stat-cap {
  color: var(--materin-text-muted);
  font-size: 11.5px;
  font-weight: 600;
}

.materin-learn-batch__note {
  margin: 0;
  color: var(--materin-text-faint);
  font-size: 12.5px;
  text-align: center;
  max-width: 640px;
}

/* 竖版舞台（?stage=1）：batch 放大 */
.materin-learn-body-day.is-stage .materin-learn-batch { gap: 24px; max-width: 900px; }
.materin-learn-body-day.is-stage .materin-learn-batch__lane { min-height: 88px; border-radius: 20px; gap: 16px; padding: 14px; }
.materin-learn-body-day.is-stage .materin-learn-batch__lane-tag { min-width: 220px; font-size: 28px; }
.materin-learn-body-day.is-stage .materin-learn-batch__grid { gap: 14px; }
.materin-learn-body-day.is-stage .materin-learn-batch__cell { height: 56px; border-radius: 14px; }
.materin-learn-body-day.is-stage .materin-learn-batch__stat-num { font-size: 44px; }
.materin-learn-body-day.is-stage .materin-learn-batch__stat-cap { font-size: 24px; }
.materin-learn-body-day.is-stage .materin-learn-batch__note { font-size: 28px; max-width: 840px; }

/* tool：函数调用（第 22 天）——问题行 + 申请行（模型写的）+ 外呼行（你的代码
   执行）+ 答案行；格只动 transform，初始可见不靠 opacity（导出/采样不会停在
   透明第一帧）；申请行 JSON 风格等宽字，外呼行点亮走描边+阴影。 */
.materin-learn-tool {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
}

.materin-learn-tool__question {
  max-width: 560px;
  padding: 10px 20px;
  border: 1px solid var(--materin-accent-border);
  border-radius: 999px;
  background:
    radial-gradient(120% 160% at 80% 0%, var(--materin-accent-soft), transparent 60%),
    var(--materin-surface-2);
  color: var(--materin-text);
  font-size: 14px;
  font-weight: 650;
  text-align: center;
}

.materin-learn-tool__tag {
  color: var(--materin-text-muted);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.03em;
  align-self: flex-start;
}

.materin-learn-tool__tag--world { color: var(--materin-warn); }

.materin-learn-tool__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  width: 100%;
  min-height: 52px;
  padding: 8px;
  border: 1px solid var(--materin-glass-border);
  border-radius: 14px;
  background: var(--materin-glass-bg-subtle);
  transition: border-color var(--materin-duration-normal, 0.3s) ease,
              box-shadow var(--materin-duration-normal, 0.3s) ease;
}

.materin-learn-tool__row--call { border-color: var(--materin-accent-border); }

.materin-learn-tool__row--world { border-style: dashed; }
.materin-learn-tool__row--world.is-live {
  border-color: var(--materin-warn-border);
  box-shadow: var(--materin-shadow);
}

.materin-learn-tool__row--ans { border-style: dashed; }

.materin-learn-tool__cell {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 32px;
  padding: 0 12px;
  border: 1px solid var(--materin-border);
  border-radius: 8px;
  background: var(--materin-surface-2);
  color: var(--materin-text);
  font-size: 13.5px;
  white-space: nowrap;
}

.materin-learn-tool__cell--call {
  border-color: var(--materin-accent-border);
  background: var(--materin-surface-3);
  color: var(--materin-accent);
  font-family: var(--materin-font-mono, ui-monospace, monospace);
  font-size: 13px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  transform: translateY(8px) scaleY(0.2);
  transform-origin: center bottom;
  transition: transform 0.38s cubic-bezier(0.2, 0.9, 0.3, 1.15);
}

.materin-learn-tool__cell--call.is-in { transform: translateY(0) scaleY(1); }

.materin-learn-tool__cell--world {
  border-color: var(--materin-warn-border);
  background: var(--materin-warn-soft);
  color: var(--materin-warn);
  font-weight: 650;
  transform: translateY(8px) scaleY(0.2);
  transform-origin: center bottom;
  transition: transform 0.38s cubic-bezier(0.2, 0.9, 0.3, 1.15);
}

.materin-learn-tool__cell--world.is-in { transform: translateY(0) scaleY(1); }

.materin-learn-tool__cell--ans {
  border-color: var(--materin-ok-border);
  background: var(--materin-ok-soft, var(--materin-surface-2));
  color: var(--materin-ok);
  font-weight: 700;
  transform: translateY(8px) scaleY(0.2);
  transform-origin: center bottom;
  transition: transform 0.42s cubic-bezier(0.2, 0.9, 0.3, 1.15);
}

.materin-learn-tool__cell--ans.is-in { transform: translateY(0) scaleY(1); }

.materin-learn-tool__verdict {
  align-self: flex-start;
  color: var(--materin-ok);
  font-size: 13px;
  font-weight: 700;
  transform: translateX(-4px) scaleY(0.6);
  transition: transform 0.35s var(--materin-ease-standard, ease);
}

.materin-learn-tool__verdict.is-in { transform: translateX(0) scaleY(1); }

.materin-learn-tool__readout {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

.materin-learn-tool__stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 8px 16px;
  border: 1px solid var(--materin-glass-border);
  border-radius: 12px;
  background: var(--materin-surface-2);
}

.materin-learn-tool__stat-num {
  color: var(--materin-accent);
  font-size: 20px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.materin-learn-tool__stat-cap {
  color: var(--materin-text-muted);
  font-size: 11.5px;
  font-weight: 600;
}

.materin-learn-tool__note {
  margin: 0;
  color: var(--materin-text-faint);
  font-size: 12.5px;
  text-align: center;
  max-width: 640px;
}

@media (prefers-reduced-motion: reduce) {
  .materin-learn-tool__cell--call,
  .materin-learn-tool__cell--world,
  .materin-learn-tool__cell--ans { transform: none; transition: none; }
  .materin-learn-tool__verdict { transform: none; }
}

/* 竖版舞台（?stage=1）：tool 放大 */
.materin-learn-body-day.is-stage .materin-learn-tool { gap: 24px; max-width: 900px; }
.materin-learn-body-day.is-stage .materin-learn-tool__question { font-size: 34px; padding: 16px 34px; border-radius: 24px; }
.materin-learn-body-day.is-stage .materin-learn-tool__tag { font-size: 26px; }
.materin-learn-body-day.is-stage .materin-learn-tool__row { min-height: 92px; border-radius: 24px; gap: 14px; padding: 14px; }
.materin-learn-body-day.is-stage .materin-learn-tool__cell { height: 56px; padding: 0 22px; border-radius: 14px; font-size: 28px; }
.materin-learn-body-day.is-stage .materin-learn-tool__verdict { font-size: 28px; }
.materin-learn-body-day.is-stage .materin-learn-tool__stat-num { font-size: 44px; }
.materin-learn-body-day.is-stage .materin-learn-tool__stat-cap { font-size: 24px; }
.materin-learn-body-day.is-stage .materin-learn-tool__note { font-size: 28px; max-width: 840px; }

/* bench：评测（第 23 天）——两套配方 × 三行模型分数条，名次徽章随分数重排。
   条只动 transform（scaleX），初始可见不靠 opacity，循环重播。 */
.materin-learn-bench {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
}

.materin-learn-bench__tag {
  align-self: flex-start;
  padding: 8px 16px;
  border: 1px solid var(--materin-accent-border);
  border-radius: 999px;
  background:
    radial-gradient(120% 160% at 80% 0%, var(--materin-accent-soft), transparent 60%),
    var(--materin-surface-2);
  color: var(--materin-accent);
  font-size: 13px;
  font-weight: 700;
}

.materin-learn-bench__tag.is-second {
  border-color: var(--materin-warn-border);
  background:
    radial-gradient(120% 160% at 80% 0%, var(--materin-warn-soft), transparent 60%),
    var(--materin-surface-2);
  color: var(--materin-warn);
}

.materin-learn-bench__rows {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
  padding: 12px;
  border: 1px solid var(--materin-glass-border);
  border-radius: 14px;
  background: var(--materin-glass-bg-subtle);
  box-shadow: var(--materin-shadow);
}

.materin-learn-bench__row {
  display: grid;
  grid-template-columns: 64px 44px 1fr 40px;
  align-items: center;
  gap: 10px;
  min-height: 40px;
}

.materin-learn-bench__name {
  color: var(--materin-text);
  font-size: 13.5px;
  font-weight: 650;
  white-space: nowrap;
}

.materin-learn-bench__rank {
  justify-self: center;
  min-width: 36px;
  padding: 2px 8px;
  border: 1px solid var(--materin-border);
  border-radius: 999px;
  background: var(--materin-surface-2);
  color: var(--materin-text-muted);
  font-family: var(--materin-font-mono, ui-monospace, monospace);
  font-size: 12px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  text-align: center;
  white-space: nowrap;
  transform: translateY(6px) scaleY(0.4);
  transition: transform 0.3s cubic-bezier(0.2, 0.9, 0.3, 1.15);
}

.materin-learn-bench__rank.is-in { transform: translateY(0) scaleY(1); }

.materin-learn-bench__row.is-top .materin-learn-bench__rank {
  border-color: var(--materin-ok-border);
  background: var(--materin-ok-soft);
  color: var(--materin-ok);
}

.materin-learn-bench__track {
  height: 18px;
  border: 1px solid var(--materin-border);
  border-radius: 6px;
  background: var(--materin-surface-2);
  overflow: hidden;
}

.materin-learn-bench__bar {
  height: 100%;
  border-radius: 5px;
  background: linear-gradient(90deg, var(--materin-accent-soft), var(--materin-accent));
  transform-origin: left center;
}

.materin-learn-bench__row.is-top .materin-learn-bench__bar {
  background: linear-gradient(90deg, var(--materin-ok-soft), var(--materin-ok));
}

.materin-learn-bench__row.is-flat .materin-learn-bench__num { color: var(--materin-text-faint); }

.materin-learn-bench__num {
  color: var(--materin-text);
  font-family: var(--materin-font-mono, ui-monospace, monospace);
  font-size: 14px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.materin-learn-bench__readout {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

.materin-learn-bench__stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 8px 16px;
  border: 1px solid var(--materin-glass-border);
  border-radius: 12px;
  background: var(--materin-surface-2);
}

.materin-learn-bench__stat-num {
  color: var(--materin-accent);
  font-size: 20px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.materin-learn-bench__stat-cap {
  color: var(--materin-text-muted);
  font-size: 11.5px;
  font-weight: 600;
}

.materin-learn-bench__verdict {
  align-self: center;
  padding: 6px 16px;
  border-radius: 10px;
  background: var(--materin-ok-soft);
  border: 1px solid var(--materin-ok-border);
  color: var(--materin-ok);
  font-size: 13px;
  font-weight: 700;
  transform: translateX(-4px) scaleY(0.6);
  transition: transform 0.35s var(--materin-ease-standard, ease);
}

.materin-learn-bench__verdict.is-in { transform: translateX(0) scaleY(1); }

.materin-learn-bench__note {
  margin: 0;
  color: var(--materin-text-faint);
  font-size: 12.5px;
  text-align: center;
  max-width: 640px;
}

@media (prefers-reduced-motion: reduce) {
  .materin-learn-bench__rank,
  .materin-learn-bench__verdict { transform: none; transition: none; }
}

/* 竖版舞台（?stage=1）：bench 放大 */
.materin-learn-body-day.is-stage .materin-learn-bench { gap: 22px; max-width: 900px; }
.materin-learn-body-day.is-stage .materin-learn-bench__tag { font-size: 27px; padding: 14px 30px; }
.materin-learn-body-day.is-stage .materin-learn-bench__rows { border-radius: 24px; gap: 16px; padding: 22px; }
.materin-learn-body-day.is-stage .materin-learn-bench__row { min-height: 84px; gap: 18px; grid-template-columns: 150px 96px 1fr 90px; }
.materin-learn-body-day.is-stage .materin-learn-bench__name { font-size: 30px; }
.materin-learn-body-day.is-stage .materin-learn-bench__rank { font-size: 26px; min-width: 80px; padding: 6px 16px; }
.materin-learn-body-day.is-stage .materin-learn-bench__track { height: 40px; border-radius: 12px; }
.materin-learn-body-day.is-stage .materin-learn-bench__num { font-size: 32px; }
.materin-learn-body-day.is-stage .materin-learn-bench__stat-num { font-size: 44px; }
.materin-learn-body-day.is-stage .materin-learn-bench__stat-cap { font-size: 24px; }
.materin-learn-body-day.is-stage .materin-learn-bench__verdict { font-size: 28px; }
.materin-learn-body-day.is-stage .materin-learn-bench__note { font-size: 28px; max-width: 840px; }

/* recipe：数据配方（第 24 天）——三份食谱 × 12 格零和预算，格子按来源着色。
   格子初始可见，入场只用 transform（pop，由 --recipe-f 驱动），循环重播。 */
.materin-learn-recipe {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
}

.materin-learn-recipe__rows {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
  padding: 12px;
  border: 1px solid var(--materin-glass-border);
  border-radius: 14px;
  background: var(--materin-glass-bg-subtle);
  box-shadow: var(--materin-shadow);
}

.materin-learn-recipe__row {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 44px;
}

.materin-learn-recipe__tag {
  flex: 0 0 132px;
  color: var(--materin-text);
  font-size: 12.5px;
  font-weight: 700;
  white-space: nowrap;
}

.materin-learn-recipe__cells {
  flex: 1;
  display: flex;
  gap: 5px;
}

.materin-learn-recipe__cell {
  --recipe-c: var(--materin-accent);
  --recipe-f: 0;
  width: 24px;
  height: 30px;
  border: 1px solid var(--materin-border);
  border-radius: 6px;
  background:
    linear-gradient(90deg,
      color-mix(in srgb, var(--recipe-c) calc(var(--recipe-f) * 100%), transparent),
      color-mix(in srgb, var(--recipe-c) calc(var(--recipe-f) * 38%), transparent));
  transform: scale(calc(0.82 + var(--recipe-f) * 0.18));
  transition: transform 0.3s var(--materin-ease-standard, ease);
}

.materin-learn-recipe__cell--web { --recipe-c: var(--materin-accent); }
.materin-learn-recipe__cell--code { --recipe-c: var(--materin-secondary); }
.materin-learn-recipe__cell--zh { --recipe-c: var(--materin-ok); }
.materin-learn-recipe__cell--math { --recipe-c: var(--materin-warn); }

.materin-learn-recipe__out {
  flex: 0 0 158px;
  color: var(--materin-accent);
  font-family: var(--materin-font-mono, ui-monospace, monospace);
  font-size: 13.5px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  text-align: right;
  white-space: nowrap;
  transform: translateX(6px);
  transition: transform 0.35s var(--materin-ease-standard, ease);
}

.materin-learn-recipe__out.is-in { transform: translateX(0); }

.materin-learn-recipe__readout {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

.materin-learn-recipe__stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 8px 16px;
  border: 1px solid var(--materin-glass-border);
  border-radius: 12px;
  background: var(--materin-surface-2);
}

.materin-learn-recipe__stat-num {
  color: var(--materin-accent);
  font-size: 20px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.materin-learn-recipe__stat-cap {
  color: var(--materin-text-muted);
  font-size: 11.5px;
  font-weight: 600;
}

.materin-learn-recipe__note {
  margin: 0;
  color: var(--materin-text-faint);
  font-size: 12.5px;
  text-align: center;
  max-width: 640px;
}

@media (prefers-reduced-motion: reduce) {
  .materin-learn-recipe__cell,
  .materin-learn-recipe__out { transform: none; transition: none; }
}

/* 竖版舞台（?stage=1）：recipe 放大 */
.materin-learn-body-day.is-stage .materin-learn-recipe { gap: 22px; max-width: 900px; }
.materin-learn-body-day.is-stage .materin-learn-recipe__rows { border-radius: 24px; gap: 16px; padding: 22px; }
.materin-learn-body-day.is-stage .materin-learn-recipe__row { min-height: 84px; gap: 18px; }
.materin-learn-body-day.is-stage .materin-learn-recipe__tag { flex-basis: 250px; font-size: 26px; }
.materin-learn-body-day.is-stage .materin-learn-recipe__cells { gap: 10px; }
.materin-learn-body-day.is-stage .materin-learn-recipe__cell { width: 46px; height: 52px; border-radius: 10px; }
.materin-learn-body-day.is-stage .materin-learn-recipe__out { flex-basis: 250px; font-size: 26px; }
.materin-learn-body-day.is-stage .materin-learn-recipe__stat-num { font-size: 44px; }
.materin-learn-body-day.is-stage .materin-learn-recipe__stat-cap { font-size: 24px; }
.materin-learn-body-day.is-stage .materin-learn-recipe__note { font-size: 28px; max-width: 840px; }

/* scale：规模定律（第 25 天）——同一笔算力的两种花法：Gopher / Chinchilla 两行
   token 块按比例点亮（数据块 vs 参数块），下方单模型损失曲线三锚点。
   格子初始可见，入场只动 transform（--scale-f / --scale-c 驱动），循环重播。 */
.materin-learn-scale {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
}

.materin-learn-scale__budget {
  align-self: center;
  padding: 5px 16px;
  border: 1px solid var(--materin-accent-border);
  border-radius: 999px;
  background: var(--materin-accent-soft);
  color: var(--materin-accent);
  font-family: var(--materin-font-mono, ui-monospace, monospace);
  font-size: 12.5px;
  font-weight: 700;
  white-space: nowrap;
}

.materin-learn-scale__rows {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
  padding: 12px;
  border: 1px solid var(--materin-glass-border);
  border-radius: 14px;
  background: var(--materin-glass-bg-subtle);
  box-shadow: var(--materin-shadow);
}

.materin-learn-scale__row {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 44px;
}

.materin-learn-scale__head {
  flex: 0 0 150px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.materin-learn-scale__tag {
  color: var(--materin-text);
  font-size: 12.5px;
  font-weight: 700;
  white-space: nowrap;
}

.materin-learn-scale__row--chinchilla .materin-learn-scale__tag { color: var(--materin-accent); }

.materin-learn-scale__cells {
  flex: 1;
  display: flex;
  gap: 3px;
  min-width: 0;
}

.materin-learn-scale__cell {
  --scale-f: 0;
  width: 16px;
  min-width: 0;
  flex: 1 1 0;
  height: 30px;
  border: 1px solid var(--materin-border);
  border-radius: 5px;
  transform: scale(calc(0.82 + var(--scale-f) * 0.18));
  transition: transform 0.3s var(--materin-ease-standard, ease);
}

/* 数据 token 块：主强调色（喂得多） */
.materin-learn-scale__cell--data {
  border-color: var(--materin-accent-border);
  background:
    linear-gradient(90deg,
      color-mix(in srgb, var(--materin-accent) calc(var(--scale-f) * 100%), transparent),
      color-mix(in srgb, var(--materin-accent) calc(var(--scale-f) * 38%), transparent));
}

/* 参数 token 块：中性色（存款空间） */
.materin-learn-scale__cell--param {
  border-color: color-mix(in srgb, var(--materin-text-muted) 45%, transparent);
  background:
    linear-gradient(90deg,
      color-mix(in srgb, var(--materin-text-muted) calc(var(--scale-f) * 70%), transparent),
      color-mix(in srgb, var(--materin-text-muted) calc(var(--scale-f) * 26%), transparent));
}

.materin-learn-scale__row--chinchilla.is-live .materin-learn-scale__cell--data,
.materin-learn-scale__row--chinchilla .materin-learn-scale__cell--data { border-color: var(--materin-accent); }

.materin-learn-scale__stats {
  flex: 0 0 190px;
  display: flex;
  flex-direction: column;
  gap: 1px;
  text-align: right;
}

.materin-learn-scale__n,
.materin-learn-scale__d {
  color: var(--materin-text);
  font-family: var(--materin-font-mono, ui-monospace, monospace);
  font-size: 12px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.materin-learn-scale__ratio {
  color: var(--materin-text-muted);
  font-size: 11px;
  font-weight: 600;
  white-space: nowrap;
}

.materin-learn-scale__row--chinchilla .materin-learn-scale__ratio { color: var(--materin-accent); }

/* 单模型损失曲线：三锚点 + 生长线 */
.materin-learn-scale__curve {
  position: relative;
  width: 100%;
  padding: 14px 10px 4px;
  border: 1px solid var(--materin-glass-border);
  border-radius: 14px;
  background: var(--materin-glass-bg-subtle);
}

.materin-learn-scale__axis-y {
  position: absolute;
  top: 8px;
  left: 20px;
  color: var(--materin-text-muted);
  font-family: var(--materin-font-mono, ui-monospace, monospace);
  font-size: 10.5px;
  font-weight: 700;
}

.materin-learn-scale__axis-x {
  margin-top: 4px;
  text-align: right;
  color: var(--materin-text-muted);
  font-family: var(--materin-font-mono, ui-monospace, monospace);
  font-size: 10.5px;
  font-weight: 700;
}

.materin-learn-scale__track {
  position: relative;
  height: 88px;
  margin-top: 14px;
}

.materin-learn-scale__line {
  --scale-c: 0;
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 100%;
}

.materin-learn-scale__line::before {
  content: '';
  position: absolute;
  inset: 0;
  border-bottom: 1px solid var(--materin-border);
  background:
    linear-gradient(to right,
      var(--materin-glass-border) 1px, transparent 1px) 0 0 / 25% 100%;
  opacity: 0.4;
}

/* 损失曲线本体：损失下降（左高右低），--scale-c 控制横向揭示 */
.materin-learn-scale__line::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, var(--materin-accent) 55%, var(--materin-ok));
  clip-path: polygon(
    calc(var(--scale-c) * 100%) 100%,
    calc(var(--scale-c) * 100% - 100% + 4%) 14%,
    10% 30%, 18% 46%, 30% 60%, 44% 70%, 60% 77%, 78% 82%,
    100% 86%, 100% 100%);
}

.materin-learn-scale__mark {
  --scale-x: 0%;
  position: absolute;
  bottom: calc(100% - var(--scale-x) * 0.001 - 96% - 12px);
  left: var(--scale-x);
  transform: translate(-50%, 0) scale(0.9);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  opacity: 0.001;
  transition: transform 0.4s var(--materin-ease-standard, ease);
}

/* 锚点位置贴曲线近似高度：缺数据高、Chinchilla 中、过量低 */
.materin-learn-scale__mark--u { bottom: 46%; }
.materin-learn-scale__mark--c { bottom: 20%; }
.materin-learn-scale__mark--o { bottom: 4%; }

.materin-learn-scale__mark.is-in {
  transform: translate(-50%, 0) scale(1);
  opacity: 1;
}

.materin-learn-scale__mark-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 2px solid var(--materin-accent);
  background: var(--materin-surface-2);
}

.materin-learn-scale__mark--o .materin-learn-scale__mark-dot { border-color: var(--materin-ok); }

.materin-learn-scale__mark-name {
  color: var(--materin-text);
  font-size: 10.5px;
  font-weight: 700;
  white-space: nowrap;
  padding: 2px 8px;
  border-radius: 8px;
  background: var(--materin-surface-2);
  border: 1px solid var(--materin-glass-border);
}

.materin-learn-scale__mark-loss {
  color: var(--materin-text-muted);
  font-size: 9.5px;
  font-weight: 600;
  white-space: nowrap;
  padding: 1px 7px;
  border-radius: 7px;
  background: var(--materin-surface-2);
  border: 1px solid var(--materin-glass-border);
}

.materin-learn-scale__mark--o .materin-learn-scale__mark-loss { color: var(--materin-ok); }

.materin-learn-scale__readout {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

.materin-learn-scale__stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 8px 16px;
  border: 1px solid var(--materin-glass-border);
  border-radius: 12px;
  background: var(--materin-surface-2);
}

.materin-learn-scale__stat-num {
  color: var(--materin-accent);
  font-size: 20px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.materin-learn-scale__stat-cap {
  color: var(--materin-text-muted);
  font-size: 11.5px;
  font-weight: 600;
}

.materin-learn-scale__note {
  margin: 0;
  color: var(--materin-text-faint);
  font-size: 12.5px;
  text-align: center;
  max-width: 640px;
}

@media (prefers-reduced-motion: reduce) {
  .materin-learn-scale__cell,
  .materin-learn-scale__mark { transform: none; transition: none; }
}

/* 竖版舞台（?stage=1）：scale 放大 */
.materin-learn-body-day.is-stage .materin-learn-scale { gap: 26px; max-width: 900px; }
.materin-learn-body-day.is-stage .materin-learn-scale__budget { font-size: 26px; padding: 12px 30px; }
.materin-learn-body-day.is-stage .materin-learn-scale__rows { border-radius: 24px; gap: 16px; padding: 22px; }
.materin-learn-body-day.is-stage .materin-learn-scale__row { min-height: 84px; gap: 18px; }
.materin-learn-body-day.is-stage .materin-learn-scale__head { flex-basis: 230px; }
.materin-learn-body-day.is-stage .materin-learn-scale__tag { font-size: 26px; }
.materin-learn-body-day.is-stage .materin-learn-scale__cells { gap: 6px; }
.materin-learn-body-day.is-stage .materin-learn-scale__cell { height: 52px; border-radius: 8px; }
.materin-learn-body-day.is-stage .materin-learn-scale__stats { flex-basis: 300px; }
.materin-learn-body-day.is-stage .materin-learn-scale__n,
.materin-learn-body-day.is-stage .materin-learn-scale__d { font-size: 25px; }
.materin-learn-body-day.is-stage .materin-learn-scale__ratio { font-size: 22px; }
.materin-learn-body-day.is-stage .materin-learn-scale__track { height: 150px; }
.materin-learn-body-day.is-stage .materin-learn-scale__mark-name { font-size: 22px; }
.materin-learn-body-day.is-stage .materin-learn-scale__mark-loss { font-size: 19px; }
.materin-learn-body-day.is-stage .materin-learn-scale__stat-num { font-size: 44px; }
.materin-learn-body-day.is-stage .materin-learn-scale__stat-cap { font-size: 24px; }
.materin-learn-body-day.is-stage .materin-learn-scale__note { font-size: 28px; max-width: 840px; }