/* ===== ICM 2026 Model Walkthrough（仅 /projects/icm-2026/ 加载） =====
   气质延续全站 editorial / technical notebook：
   hairline、mono 元信息、无卡片/阴影/渐变/彩色。 */
.icm-walkthrough { max-width: 40rem; margin-bottom: 3rem; }
.icm-w-intro { margin: 0 0 1.25rem; color: var(--muted); }
.icm-w-chain {
  margin: 0 0 1.25rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}
.icm-w-action { margin: 0 0 0.75rem; }
.icm-w-note { margin: 0; font-size: 0.85rem; color: var(--muted); }
.icm-w-stage { position: relative; margin-top: 2rem; }

/* 文本式动作按钮（语义为 button） */
.icm-w-start,
.icm-w-text-btn {
  border: none;
  background: none;
  padding: 0.3rem 0;
  font-family: inherit;
  color: var(--text);
  cursor: pointer;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 150ms ease;
}
.icm-w-start { font-size: 1.05rem; }
.icm-w-text-btn { font-size: 0.95rem; }
.icm-w-start:hover,
.icm-w-text-btn:hover { color: var(--muted); }
.icm-w-start:disabled { color: var(--muted); text-decoration: none; cursor: default; }

/* 状态 / 加载 / 错误 */
.icm-w-status {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: 0;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}
.icm-w-loading { margin: 0; color: var(--muted); }
.icm-w-error {
  border: 1px solid var(--hairline);
  padding: 1rem 1.25rem;
}
.icm-w-error p { margin: 0 0 0.75rem; }
.icm-w-error p:last-of-type { margin: 0; }

/* 五步 progress rail：轻量 mono 导航，非 wizard */
.icm-w-rail {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.5rem;
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  padding: 0.7rem 0;
  margin: 0 0 2rem;
}
.icm-w-rail-step {
  border: none;
  background: none;
  padding: 0.35rem 0;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--muted);
  cursor: pointer;
  transition: color 150ms ease;
}
.icm-w-rail-step:hover { color: var(--text); }
.icm-w-rail-step[aria-current='step'] {
  color: var(--text);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
.icm-w-rail-step:disabled { opacity: 0.45; cursor: default; }
.icm-w-rail-step:disabled:hover { color: var(--muted); }

/* step 面板 */
.icm-w-step-label {
  margin: 0 0 0.5rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--muted);
}
.icm-w-step-title {
  margin: 0 0 1rem;
  font-size: 1.375rem;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
}
.icm-w-copy { margin: 0 0 1.5rem; }

/* Step 01 因果链：桌面横向一行（箭头为 CSS ::after），窄屏回垂直 */
.icm-w-flow {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: baseline;
  margin: 0 0 1.5rem;
  padding: 0;
  list-style: none;
}
.icm-w-flow-item {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  white-space: nowrap;
}
.icm-w-flow-item:not(:last-child)::after {
  content: '→';
  margin-left: 0.55rem;
  color: var(--muted);
  font-size: 0.7rem;
}

/* category / occupation 选择按钮（文本式，aria-pressed） */
.icm-w-cat-row,
.icm-w-occ-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.4rem;
  margin: 0 0 1.5rem;
}
.icm-w-cat,
.icm-w-occ {
  border: none;
  background: none;
  padding: 0.35rem 0;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--muted);
  cursor: pointer;
  transition: color 150ms ease;
}
.icm-w-cat:hover,
.icm-w-occ:hover { color: var(--text); }
.icm-w-cat[aria-pressed='true'],
.icm-w-occ[aria-pressed='true'] {
  color: var(--text);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

/* Step 01 六行 ranking */
.icm-w-ranks { margin: 0 0 1.75rem; padding: 0; list-style: none; border-top: 1px solid var(--hairline); }
.icm-w-rank-row {
  display: grid;
  grid-template-columns: 2.25rem 1fr auto;
  gap: 0.9rem;
  align-items: center;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--hairline);
}
.icm-w-rank-no {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.icm-w-rank-name { font-size: 0.98rem; color: var(--muted); }
.icm-w-rank-row.is-top .icm-w-rank-name { color: var(--text); font-weight: 600; }
.icm-w-rank-tag {
  margin-left: 0.6em;
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  color: var(--muted);
  font-weight: 500;
}
.icm-w-rank-bar {
  display: block;
  height: 3px;
  margin-top: 0.4rem;
  background: var(--hairline);
}
.icm-w-rank-fill { display: block; height: 100%; background: var(--muted); opacity: 0.55; }
.icm-w-rank-row.is-top .icm-w-rank-fill { background: var(--text); opacity: 1; }
.icm-w-rank-ci {
  font-family: var(--mono);
  font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
  text-align: right;
}
.icm-w-rank-row.is-top .icm-w-rank-ci { color: var(--text); }
.icm-w-rank-row:not(.is-top) .icm-w-rank-ci { color: var(--muted); }

/* Step 01 硬约束：低层级单行中文 summary */
.icm-w-constraints {
  margin: 0 0 1.75rem;
  font-size: 0.85rem;
  color: var(--muted);
}

/* step 底部导航 */
.icm-w-stepnav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--hairline);
}

/* Step 02 SVG */
.icm-w-svg { display: block; width: 100%; height: auto; margin: 0.5rem 0 1rem; }
.icm-w-svg text { font-family: var(--mono); }
.icm-w-grid { stroke: var(--hairline); stroke-width: 1; }
.icm-w-axis { stroke: var(--hairline); stroke-width: 1; }
.icm-w-axis-label { font-size: 11px; fill: var(--muted); }
.icm-w-line { fill: none; stroke: var(--muted); stroke-width: 1.5; opacity: 0.55; }
.icm-w-line.is-selected { stroke: var(--text); stroke-width: 2.25; opacity: 1; }
.icm-w-end-label { font-size: 12px; fill: var(--muted); }
.icm-w-end-label.is-selected { fill: var(--text); }
.icm-w-guide { stroke: var(--muted); stroke-width: 1; opacity: 0.35; }
.icm-w-point { fill: var(--bg); stroke: var(--muted); stroke-width: 1.5; }
.icm-w-point.is-selected { fill: var(--text); stroke: var(--text); }

/* Step 02 读数 */
.icm-w-readout { margin: 0 0 1.5rem; }
.icm-w-value {
  margin: 0;
  font-size: 2.25rem;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
}
.icm-w-meta {
  margin: 0.4rem 0 0;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}
.icm-w-detail {
  margin: 0.3rem 0 0;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* A3 — compositions, method notes and conceptual mechanism; page-scoped. */
.icm-walkthrough .icm-w-taskbar {
  display: block;
  width: 100%;
  height: auto;
  margin: 0.25rem 0 0.75rem;
}
.icm-w-segment-0 { fill: var(--text); }
.icm-w-segment-1 { fill: #9d9d98; }
.icm-w-segment-2 { fill: #d9d8d2; }
.icm-walkthrough .icm-w-shares {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 0 0 0.75rem;
}
.icm-w-shares dt { font-size: 0.85rem; color: var(--muted); }
.icm-w-shares dd {
  margin: 0.2rem 0 0;
  font-family: var(--mono);
  font-size: 1rem;
  font-variant-numeric: tabular-nums;
}
.icm-walkthrough .icm-w-method {
  margin: 1rem 0 1.5rem;
  font-size: 0.9rem;
}
.icm-w-method summary { cursor: pointer; color: var(--muted); width: fit-content; }
.icm-w-method[open] summary { margin-bottom: 1rem; }
.icm-walkthrough .icm-w-method-copy,
.icm-walkthrough .icm-w-published-value { margin: 0.75rem 0 0; }
.icm-walkthrough .icm-w-equation {
  margin: 1rem 0;
  font-family: var(--mono);
  font-size: 0.78rem;
  overflow-wrap: anywhere;
}
.icm-walkthrough .icm-w-definitions { margin: 0; }
.icm-w-definitions > div {
  display: grid;
  grid-template-columns: 8rem minmax(0, 1fr);
  gap: 1rem;
  margin: 0.75rem 0;
}
.icm-w-definitions dt { color: var(--muted); font-size: 0.85rem; }
.icm-w-definitions dd { margin: 0; font-size: 0.9rem; }
.icm-walkthrough .icm-w-mechanism {
  padding-top: 1rem;
  margin: 0.5rem 0 1.5rem;
  border-top: 1px solid var(--hairline);
}
@media (max-width: 640px) {
  .icm-w-definitions > div { grid-template-columns: 1fr; gap: 0.2rem; }
}

/* A4 — curriculum is a readable list, admissions keeps its own year controls. */
.icm-walkthrough .icm-w-subhead { margin: 2rem 0 1rem; font-size: 1rem; font-weight: 600; }
.icm-walkthrough .icm-w-curriculum { margin: 0 0 1rem; }
.icm-w-curriculum-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.25rem 1rem;
  padding: 0.7rem 0;
  border-top: 1px solid var(--hairline);
}
.icm-w-curriculum-row dt { font-size: 0.95rem; }
.icm-w-curriculum-en { display: block; font-size: 0.75rem; color: var(--muted); }
.icm-w-curriculum-row dd { margin: 0; font-family: var(--mono); font-size: 0.9rem; font-variant-numeric: tabular-nums; }
.icm-w-curriculum-bar { grid-column: 1 / -1; height: 3px; background: var(--hairline); margin-top: 0.25rem; }
.icm-w-curriculum-fill { display: block; height: 100%; background: var(--muted); }
.icm-w-baseline { stroke: var(--muted); stroke-width: 1; stroke-dasharray: 3 4; opacity: 0.4; }
.icm-walkthrough .icm-w-admission-timing { margin: 0.75rem 0 0; font-size: 0.95rem; }
.icm-walkthrough .icm-w-admission-note { margin: 0.35rem 0 0; color: var(--muted); font-size: 0.85rem; }
.icm-walkthrough .icm-w-admission-years { margin: 0 0 1.5rem; }
.icm-w-admission-year-row { display: flex; justify-content: space-between; gap: 0.75rem; }
@media (max-width: 640px) {
  /* Keep the established adoption figure unchanged; improve the new charts' labels. */
  .icm-w-svg[aria-labelledby^='icm-w-chart-'] .icm-w-axis-label,
  .icm-w-svg[aria-labelledby^='icm-w-admissions-title'] .icm-w-axis-label,
  .icm-w-svg[aria-labelledby^='icm-w-admissions-title'] .icm-w-end-label { font-size: 17px; }
}

/* Step 02 离散年份控制 */
.icm-w-year { margin: 0 0 1.5rem; }
.icm-w-year-label {
  display: block;
  margin: 0 0 0.5rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}
/* 滑杆：hairline track + 小 thumb，作为辅助控制而非视觉主角。
   输入框保留 22px 高作为触控/点击舒适区，视觉轨道只有 1px。 */
.icm-w-year input[type='range'] {
  display: block;
  width: 100%;
  height: 22px;
  margin: 0;
  appearance: none;
  -webkit-appearance: none;
  background: transparent;
  cursor: pointer;
}
.icm-w-year input[type='range']::-webkit-slider-runnable-track {
  height: 1px;
  background: var(--hairline);
}
.icm-w-year input[type='range']::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 10px;
  height: 10px;
  margin-top: -4.5px;
  border: none;
  border-radius: 50%;
  background: var(--text);
}
.icm-w-year input[type='range']::-moz-range-track {
  height: 1px;
  background: var(--hairline);
}
.icm-w-year input[type='range']::-moz-range-thumb {
  width: 10px;
  height: 10px;
  border: none;
  border-radius: 50%;
  background: var(--text);
}
/* 焦点样式跟随全站 focus-visible 语言，但落在 thumb 上，避免整条矩形 outline */
.icm-w-year input[type='range']:focus-visible { outline: none; }
.icm-w-year input[type='range']:focus-visible::-webkit-slider-thumb {
  outline: 2px solid var(--text);
  outline-offset: 2px;
}
.icm-w-year input[type='range']:focus-visible::-moz-range-thumb {
  outline: 2px solid var(--text);
  outline-offset: 2px;
}
.icm-w-ticks {
  display: flex;
  justify-content: space-between;
  margin-top: 0.35rem;
}
.icm-w-tick {
  min-width: 1px;
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--muted);
  text-align: center;
  font-variant-numeric: tabular-nums;
}
.icm-w-tick::before {
  content: '';
  display: block;
  width: 1px;
  height: 5px;
  margin: 0 auto 0.15rem;
  background: var(--hairline);
}

/* 移动端 */
@media (max-width: 640px) {
  .icm-w-rank-row { grid-template-columns: 1.9rem 1fr auto; gap: 0.7rem; }
  .icm-w-value { font-size: 1.9rem; }
  .icm-w-rail { gap: 0.3rem 1rem; }
  /* 因果链窄屏回垂直布局，箭头换 ↓ */
  .icm-w-flow { display: block; }
  .icm-w-flow-item:not(:last-child)::after {
    content: '↓';
    display: block;
    margin: 0.1rem 0;
  }
}

/* 减少动态效果 */
@media (prefers-reduced-motion: reduce) {
  .icm-w-start,
  .icm-w-text-btn,
  .icm-w-rail-step,
  .icm-w-cat,
  .icm-w-occ { transition: none; }
}