/* ============================================================
   DECODE LAB · "数据暗房" 设计系统
   深墨底 + 琥珀背光, 大数字 + 自绘图表 + 编排动画
   字体: 思源宋体 (display) + 思源黑体 (UI) + JetBrains Mono (data)
   ============================================================ */

:root {
  /* — 颜色 (暗房 + 琥珀) — */
  --ink: #f4f1e8;            /* 主文字, 暖白 */
  --ink-soft: #c5c0ad;       /* 次要 */
  --ink-faint: #8a8678;      /* 辅助 */
  --ink-ghost: #4a4838;      /* 极淡 */
  --paper: #0a0e1a;          /* 主背景, 深墨 */
  --paper-2: #0f1424;        /* 章节背景 */
  --paper-3: #141a2c;        /* 卡片 */
  --paper-4: #1c2238;        /* 悬浮卡片 */
  --paper-elev: #232a42;     /* 抬升 */
  --line: rgba(244, 241, 232, 0.08);
  --line-strong: rgba(244, 241, 232, 0.16);
  --line-amber: rgba(244, 162, 97, 0.32);

  --amber: #f4a261;          /* 主色, 琥珀 */
  --amber-bright: #f6b27a;
  --amber-dim: #b87a4c;
  --amber-glow: rgba(244, 162, 97, 0.12);
  --amber-glow-strong: rgba(244, 162, 97, 0.25);

  --mint: #2a9d8f;           /* 正面, 薄荷 */
  --mint-glow: rgba(42, 157, 143, 0.12);
  --crimson: #e76f51;        /* 警告, 朱红 */
  --crimson-glow: rgba(231, 111, 81, 0.12);
  --saffron: #e9c46a;        /* 强调, 沙金 */
  --saffron-glow: rgba(233, 196, 106, 0.12);
  --indigo: #6c7b9e;         /* 冷色 */
  --indigo-glow: rgba(108, 123, 158, 0.12);

  /* — 字体 — */
  --font-display: 'Source Han Serif SC', 'Noto Serif SC', 'Songti SC', STSong, SimSun, serif;
  --font-prose: 'Source Han Serif SC', 'Noto Serif SC', 'Songti SC', STSong, SimSun, serif;
  --font-body: 'Source Han Sans SC', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Source Code Pro', Consolas, 'Courier New', monospace;

  /* — 字号 (clamp 流式) — */
  --text-3xs: 0.625rem;
  --text-2xs: 0.7rem;
  --text-xs: 0.78rem;
  --text-sm: 0.88rem;
  --text-base: 1rem;
  --text-md: 1.1rem;
  --text-lg: 1.25rem;
  --text-xl: clamp(1.5rem, 2.4vw, 2rem);
  --text-2xl: clamp(1.9rem, 3.2vw, 2.8rem);
  --text-3xl: clamp(2.4rem, 4.5vw, 3.8rem);
  --text-4xl: clamp(3rem, 7vw, 5.5rem);
  --text-5xl: clamp(3.5rem, 10vw, 8rem);
  --text-6xl: clamp(4rem, 13vw, 10rem);

  /* — 间距 (8 像素基准) — */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-7: 2rem;
  --space-8: 2.5rem;
  --space-9: 3.5rem;
  --space-10: 5rem;
  --space-11: 7rem;
  --space-12: 9rem;

  /* — 圆角 — */
  --radius-sm: 6px;
  --radius: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-pill: 999px;

  /* — 阴影 — */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.28);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.45);
  --shadow-amber: 0 8px 32px rgba(244, 162, 97, 0.18);
  --shadow-inset: inset 0 1px 0 rgba(244, 241, 232, 0.06);

  /* — 容器 — */
  --max-w: 1320px;
  --pad-x: clamp(1rem, 4vw, 2rem);
  --section-y: clamp(5rem, 10vw, 9rem);

  /* — 动效 — */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --t-fast: 150ms;
  --t: 280ms;
  --t-slow: 500ms;
  --t-dramatic: 900ms;
}

/* ================================================================
   Reset
   ================================================================ */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
  /* 锚链接跳转: 给 sticky topnav + tab-nav 留空, 跳到目标时不被遮挡 */
  scroll-padding-top: 80px;
}
body {
  font-family: var(--font-body);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.65;
  font-size: var(--text-base);
  font-feature-settings: "kern" 1, "liga" 1;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  min-height: 100vh;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: transparent; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; transition: color var(--t) var(--ease-out); }
ul, ol { list-style: none; }
input, select, textarea { font: inherit; color: inherit; }
code, kbd, pre { font-family: var(--font-mono); }

/* 表格数字对齐 */
.tnum { font-variant-numeric: tabular-nums; font-feature-settings: "tnum" 1; }

/* ================================================================
   背景 — 多层质感
   ================================================================ */
.bg-grid, .bg-noise, .bg-glow, .bg-vignette {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}
.bg-grid {
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: clamp(50px, 5vw, 90px) clamp(50px, 5vw, 90px);
  opacity: 0.35;
  -webkit-mask-image: radial-gradient(ellipse at top, black 25%, transparent 70%);
  mask-image: radial-gradient(ellipse at top, black 25%, transparent 70%);
}
.bg-noise {
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E");
  opacity: 0.05;
  mix-blend-mode: overlay;
}
.bg-glow {
  background:
    radial-gradient(ellipse at 12% 18%, rgba(244, 162, 97, 0.09) 0%, transparent 50%),
    radial-gradient(ellipse at 88% 82%, rgba(42, 157, 143, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 100%, rgba(231, 111, 81, 0.04) 0%, transparent 60%);
  animation: glow-drift 30s ease-in-out infinite alternate;
}
.bg-vignette {
  background: radial-gradient(ellipse at center, transparent 30%, rgba(0, 0, 0, 0.4) 100%);
}
@keyframes glow-drift {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(2%, -2%) scale(1.05); }
}

/* ================================================================
   Skip link, 焦点环
   ================================================================ */
.skip-link {
  position: fixed;
  top: -200px; left: var(--space-4);
  z-index: 1000;
  padding: var(--space-3) var(--space-5);
  background: var(--amber);
  color: var(--paper);
  font-weight: 700;
  border-radius: var(--radius-sm);
  transition: top var(--t) var(--ease-out);
}
.skip-link:focus { top: var(--space-4); }
:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ================================================================
   顶部导航
   ================================================================ */
.topnav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--pad-x);
  background: rgba(10, 14, 26, 0.78);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--line);
}
.topnav::after {
  content: '';
  position: absolute;
  bottom: -1px; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--amber-glow) 50%, transparent);
  opacity: 0.6;
}
.topnav-logo {
  font-family: var(--font-display);
  font-size: var(--text-md);
  font-weight: 900;
  letter-spacing: 0.12em;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  transition: color var(--t) var(--ease-out);
}
.topnav-logo:hover { color: var(--amber); }
.topnav-logo-dot {
  width: 8px;
  height: 8px;
  background: var(--amber);
  border-radius: 50%;
  box-shadow: 0 0 12px var(--amber), 0 0 4px var(--amber);
  animation: dot-pulse 3.2s var(--ease-in-out) infinite;
}
@keyframes dot-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.45; transform: scale(0.85); }
}
.topnav-logo-mark {
  color: var(--amber);
  margin-left: 0.15em;
  font-weight: 400;
}
.topnav-links {
  display: flex;
  gap: var(--space-7);
  align-items: center;
}
/* 顶部 nav 链接 (desktop 横排, mobile 折叠菜单) 已删除 — 用户反馈"有跟没有一样",
   简化 topnav 为 logo + lang 两个元素。.topnav-link / .topnav-burger /
   .nav-overlay 整段 CSS 不再需要。 */
.lang-toggle {
  margin-left: var(--space-2);
  padding: 6px 14px;
  background: rgba(244, 162, 97, 0.08);
  border: 1px solid rgba(244, 162, 97, 0.45);
  border-radius: var(--radius-sm);
  color: var(--amber);
  font: inherit;
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: border-color 0.18s ease, color 0.18s ease, background 0.18s ease;
}
.lang-toggle:hover { border-color: var(--amber); color: var(--amber-bright); background: var(--amber-glow); }
/* 404 页面替代 lang 按钮的"← 主页"链接 — 视觉沿用 lang-toggle 风格, 避免 dead button */
.topnav-home-link {
  margin-left: var(--space-2);
  padding: 6px 14px;
  background: rgba(244, 162, 97, 0.08);
  border: 1px solid rgba(244, 162, 97, 0.45);
  border-radius: var(--radius-sm);
  color: var(--amber);
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: border-color 0.18s ease, color 0.18s ease, background 0.18s ease;
}
.topnav-home-link:hover { border-color: var(--amber); color: var(--amber-bright); background: var(--amber-glow); }
/* topnav-controls: 桌面下跟 topnav-links 一起靠右挤成一条; mobile 下单独作为右侧控制组 */
.topnav-controls {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
}
/* topnav 中间 in-page 锚链接 (领域/数字/方法/技术), 解决"上栏太空"问题:
   - desktop 显示 (4 链接横排)
   - mobile 隐藏 (mobile-tab-bar 在底部已经承担了内导航职责) */
.topnav-quick {
  display: none;
}
.topnav-quick a {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--ink-soft);
  text-decoration: none;
  letter-spacing: 0.06em;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: color 0.18s ease, background 0.18s ease;
}
.topnav-quick a:hover {
  color: var(--amber);
  background: rgba(244, 162, 97, 0.06);
}
@media (min-width: 769px) {
  /* desktop: topnav 简化为 logo + lang, controls 用 margin-left auto 钉到 right */
  .topnav-controls { margin-left: auto; }
  /* 桌面下显示 in-page nav (logo 和 lang 中间塞 4 个锚链接) */
  .topnav-quick {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    margin-left: var(--space-5);
  }
}
/* mobile 折叠菜单 (burger + drawer + overlay) 已删除, 不再需要这个 media query 块 */
/* .nav-overlay 已删除 — topnav 简化后不再需要抽屉遮罩 */

/* ================================================================
   容器
   ================================================================ */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--pad-x);
  position: relative;
  z-index: 1;
}
.section {
  padding: var(--section-y) 0;
  position: relative;
}

/* ================================================================
   通用 UI
   ================================================================ */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  color: var(--amber);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  font-weight: 600;
  margin-bottom: var(--space-5);
}
.eyebrow::before {
  content: '';
  width: 24px;
  height: 1px;
  background: var(--amber);
  opacity: 0.6;
}
.eyebrow-dot::before { width: 6px; height: 6px; background: var(--amber); border-radius: 50%; }
.section-head {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-9);
  max-width: 720px;
}
.section-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--ink);
}
.section-title em {
  font-style: normal;
  color: var(--amber);
  font-weight: 900;
}
.section-sub {
  font-family: var(--font-prose);
  font-size: var(--text-md);
  color: var(--ink-soft);
  line-height: 1.7;
  margin-top: var(--space-3);
  max-width: 620px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-6);
  min-height: 48px;
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 600;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  transition: all var(--t) var(--ease-out);
  position: relative;
  overflow: hidden;
}
.btn-primary {
  background: var(--amber);
  color: var(--paper);
  box-shadow: var(--shadow-amber);
}
.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 40%, rgba(255, 255, 255, 0.2) 50%, transparent 60%);
  transform: translateX(-100%);
  transition: transform 600ms var(--ease-out);
}
.btn-primary:hover { transform: translateY(-2px); }
.btn-primary:hover::before { transform: translateX(100%); }
.btn-ghost {
  border-color: var(--line-strong);
  color: var(--ink-soft);
  background: rgba(244, 241, 232, 0.02);
}
.btn-ghost:hover {
  border-color: var(--amber);
  color: var(--amber);
  background: var(--amber-glow);
  transform: translateY(-2px);
}
.btn-small {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  min-height: 36px;
}
.btn-arrow {
  transition: transform var(--t) var(--ease-out);
}
.btn:hover .btn-arrow { transform: translateX(4px); }

/* ================================================================
   主页 — Hero (大数字)
   ================================================================ */
.hero {
  min-height: 92vh;
  display: flex;
  align-items: center;
  padding: var(--space-12) 0 var(--space-10);
  position: relative;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-9);
  align-items: center;
}
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: var(--space-7); }
  .hero { min-height: 80vh; padding: var(--space-9) 0 var(--space-7); }
}
.hero h1 {
  font-family: var(--font-display);
  font-size: var(--text-5xl);
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: -0.04em;
  color: var(--ink);
  margin-bottom: var(--space-5);
}
.hero h1 em {
  font-style: normal;
  color: var(--amber);
  position: relative;
  display: inline-block;
}
.hero h1 em::after {
  content: '';
  position: absolute;
  bottom: 0.05em; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(to right, var(--amber), transparent);
  opacity: 0.5;
}
.hero-sub {
  font-family: var(--font-prose);
  font-size: var(--text-md);
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 520px;
  margin-bottom: var(--space-7);
}
.hero-sub strong { color: var(--ink); font-weight: 600; }
.hero-eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--ink-faint);
  text-transform: uppercase;
  margin-bottom: var(--space-4);
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--paper-2);
}
.hero-actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-bottom: var(--space-8);
}
.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  color: var(--ink-faint);
  letter-spacing: 0.1em;
}
.hero-tag::before {
  content: '';
  width: 4px; height: 4px;
  background: var(--ink-faint);
  border-radius: 50%;
  box-shadow: 0 0 6px var(--ink-faint);
}
.hero-eyebrow,
.hero h1,
.hero h1 em,
.hero-sub,
.hero-actions,
.hero-stats {
  animation: hero-rise 800ms cubic-bezier(0.16, 1, 0.3, 1) both;
}
.hero-eyebrow { animation-delay: 100ms; }
.hero h1      { animation-delay: 220ms; }
.hero h1 em   { animation-delay: 380ms; }
.hero-sub     { animation-delay: 480ms; }
.hero-actions { animation-delay: 580ms; }
.hero-stats   { animation-delay: 700ms; }
@keyframes hero-rise {
  from { opacity: 0; transform: translateY(24px); filter: blur(4px); }
  to   { opacity: 1; transform: translateY(0);    filter: blur(0); }
}

/* 按钮按下微效果 — active:scale(0.97) 弹性 */
.btn, button, [role="button"] {
  transition: transform 120ms cubic-bezier(0.34, 1.56, 0.64, 1);
}
.btn:active, button:not(:disabled):active, [role="button"]:active {
  transform: scale(0.97);
}

/* 顶级 nav 链接 hover 下划线滑动 */
.topnav-quick a {
  position: relative;
}
.topnav-quick a::after {
  content: '';
  position: absolute;
  left: 10px; right: 10px;
  bottom: 4px;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 280ms cubic-bezier(0.16, 1, 0.3, 1);
}
.topnav-quick a:hover::after {
  transform: scaleX(1);
}
@media (max-width: 768px) {
  /* mobile 隐藏 topnav-quick, 取消 hover 下划线 */
  .topnav-quick a::after { display: none; }
}

/* Hero 右侧: 大数字展示 */
.hero-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}
.hero-stat {
  background: var(--paper-3);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  position: relative;
  overflow: hidden;
  transition: all var(--t-slow) var(--ease-out);
}
.hero-stat::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--accent, var(--amber));
  opacity: 0.6;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--t-slow) var(--ease-out);
}
.hero-stat:hover { transform: translateY(-4px); border-color: var(--line-strong); box-shadow: var(--shadow); }
.hero-stat:hover::before { transform: scaleX(1); }
.hero-stat-num {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 5vw, 4rem);
  font-weight: 900;
  line-height: 1;
  color: var(--accent, var(--amber));
  letter-spacing: -0.04em;
  font-variant-numeric: tabular-nums;
  margin-bottom: var(--space-3);
}
.hero-stat-num-suffix {
  font-size: 0.5em;
  color: var(--ink-faint);
  font-weight: 600;
  margin-left: 0.1em;
}
.hero-stat-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--ink-faint);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: var(--space-2);
}
.hero-stat-note {
  font-size: var(--text-xs);
  color: var(--ink-soft);
  line-height: 1.5;
}

/* ================================================================
   主页 — 考试领域卡片
   ================================================================ */
.exam-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(340px, 100%), 1fr));
  gap: var(--space-6);
}
.exam-card {
  background: var(--paper-3);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: var(--space-7);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  transition: all var(--t-slow) var(--ease-out);
  text-decoration: none;
  isolation: isolate;
}
.exam-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 4px; height: 100%;
  background: var(--accent, var(--amber));
  opacity: 0.7;
  transition: width var(--t-slow) var(--ease-out);
}
.exam-card::after {
  content: '';
  position: absolute;
  top: -50%; right: -50%;
  width: 200%; height: 200%;
  background: radial-gradient(circle, var(--accent-glow, var(--amber-glow)) 0%, transparent 60%);
  opacity: 0;
  transition: opacity var(--t-slow) var(--ease-out);
  pointer-events: none;
  z-index: -1;
}
.exam-card:hover {
  border-color: var(--accent, var(--amber));
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}
.exam-card:hover::before { width: 6px; }
.exam-card:hover::after { opacity: 1; }

.exam-card-head {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
}
.exam-icon {
  width: 56px; height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  background: var(--paper-4);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  flex-shrink: 0;
  transition: transform var(--t-slow) var(--ease-spring);
}
.exam-card:hover .exam-icon { transform: rotate(-8deg) scale(1.05); }
.exam-card-title-block { flex: 1; }
.exam-card-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin-bottom: 0.15rem;
}
.exam-card-code {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--ink-faint);
  letter-spacing: 0.1em;
}
.exam-card-desc {
  font-family: var(--font-prose);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--ink-soft);
  flex: 1;
}
.exam-card-meta {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  padding-top: var(--space-5);
  border-top: 1px solid var(--line);
}
.exam-card-meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}
.exam-card-meta-num {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 800;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}
.exam-card-meta-label {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  color: var(--ink-faint);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.exam-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}
.exam-status {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-pill);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.exam-status::before {
  content: '';
  width: 5px; height: 5px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 6px currentColor;
}
.exam-status.active { background: var(--accent-glow, var(--mint-glow)); color: var(--accent, var(--mint)); }
.exam-status.development { background: var(--amber-glow); color: var(--amber); }
.exam-status.placeholder { background: rgba(244, 241, 232, 0.06); color: var(--ink-faint); }

/* 考试卡片呼吸光 (仅 active) */
.exam-card.active-card::after {
  opacity: 0.35;
  animation: card-breathe 4s ease-in-out infinite;
}
@keyframes card-breathe {
  0%, 100% { opacity: 0.18; }
  50% { opacity: 0.45; }
}
.exam-status.archived { background: var(--crimson-glow); color: var(--crimson); }
.exam-card-arrow {
  font-size: 1.2rem;
  color: var(--accent, var(--amber));
  transition: transform var(--t) var(--ease-out);
}
.exam-card:hover .exam-card-arrow { transform: translateX(6px); }

/* ================================================================
   关键发现 — 大数字 + 微型图
   ================================================================ */
.findings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(240px, 100%), 1fr));
  gap: var(--space-5);
}
.finding {
  background: var(--paper-3);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: var(--space-7) var(--space-6);
  position: relative;
  overflow: hidden;
  transition: all var(--t-slow) var(--ease-out);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  cursor: pointer;
  outline: none;
}
.finding:focus-visible {
  border-color: var(--amber);
  box-shadow: 0 0 0 3px var(--amber-glow);
}
.finding:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
/* click hint — 卡片右下角"换一组"小箭头 + 4 个维度 dot 指示 */
.finding-dots {
  position: absolute;
  bottom: 12px;
  right: 14px;
  display: flex;
  gap: 5px;
  align-items: center;
}
.finding-dot {
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--line);
  transition: background 220ms var(--ease-out), transform 220ms var(--ease-out);
  --dot-c: var(--ink-faint);
}
.finding-dot.active {
  background: var(--dot-c);
  transform: scale(1.4);
  box-shadow: 0 0 6px var(--dot-c);
}
.finding-unit {
  font-size: 0.42em;
  color: var(--ink-soft);
  font-weight: 600;
  font-family: 'Source Han Sans SC', sans-serif;
  margin-left: 0.4em;
  letter-spacing: 0.05em;
  display: inline-block;
}
.finding-icon {
  width: 44px; height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  background: var(--paper-4);
  border-radius: var(--radius);
  border: 1px solid var(--line);
}
.finding-value {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 900;
  line-height: 1;
  color: var(--accent, var(--amber));
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}
.finding-value-suffix {
  font-size: 0.4em;
  color: var(--ink-faint);
  font-weight: 600;
  margin-left: 0.15em;
}
.finding-title {
  font-family: var(--font-display);
  font-size: var(--text-md);
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 0.4rem;
}
.finding-detail {
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--ink-soft);
}
.finding-spark {
  height: 32px;
  margin-top: auto;
}

/* ================================================================
   折叠卡片 — 研究方法
   ================================================================ */
.method-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.method {
  background: var(--paper-3);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--t) var(--ease-out);
}
.method:hover { border-color: var(--line-strong); }
.method-head {
  width: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-5);
  padding: var(--space-6) var(--space-7);
  text-align: left;
  font-family: var(--font-body);
  font-size: var(--text-md);
  font-weight: 600;
  color: var(--ink);
  min-height: 80px;
  position: relative;
  transition: background var(--t) var(--ease-out);
}
.method-head:hover { background: var(--paper-4); }
.method-num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--amber);
  font-weight: 700;
  letter-spacing: 0.15em;
  background: var(--amber-glow);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-pill);
  border: 1px solid var(--line-amber);
  flex-shrink: 0;
}
.method-q { flex: 1; }
.method-toggle {
  width: 36px; height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  color: var(--amber);
  border: 1px solid var(--line-amber);
  border-radius: 50%;
  transition: all var(--t) var(--ease-spring);
  flex-shrink: 0;
  font-weight: 300;
  line-height: 1;
}
.method.open .method-toggle {
  transform: rotate(45deg);
  background: var(--amber);
  color: var(--paper);
  border-color: var(--amber);
}
.method-body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 500ms var(--ease-out);
}
.method-body > .method-content {
  /* grid 0fr trick: 内部需要 overflow:hidden + min-height:0 才会跟着收缩 */
  overflow: hidden;
  min-height: 0;
}
.method.open .method-body { grid-template-rows: 1fr; }
.method-content {
  padding: 0 var(--space-7) var(--space-7);
  font-family: var(--font-prose);
  font-size: var(--text-base);
  line-height: 1.85;
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
  padding-top: var(--space-6);
  margin-top: 0;
  display: grid;
  gap: var(--space-4);
}
.method-content p { margin: 0; }
.method-content strong { color: var(--ink); font-weight: 600; }
.method-content code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--paper-4);
  padding: 0.15em 0.5em;
  border-radius: 4px;
  color: var(--amber-bright);
  border: 1px solid var(--line);
}
.method-content a {
  color: var(--amber);
  border-bottom: 1px solid var(--line-amber);
  transition: all var(--t);
}
.method-content a:hover { color: var(--amber-bright); border-bottom-color: var(--amber); }

/* ================================================================
   详情页 — Hero
   ================================================================ */
.exam-hero {
  padding: var(--space-9) 0;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, var(--paper-2) 0%, transparent 100%);
  position: relative;
  overflow: hidden;
}
/* 顶部 accent 色条 */
.exam-hero::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(to right, var(--accent, var(--amber)), transparent 70%);
  opacity: 0.8;
}
.exam-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 80% 30%, var(--accent-glow, var(--amber-glow)) 0%, transparent 50%);
  pointer-events: none;
}
.exam-hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--space-7);
}
@media (max-width: 720px) {
  .exam-hero-inner { grid-template-columns: auto 1fr; }
  .exam-hero-actions-wrap { grid-column: 1 / -1; }
}
.exam-hero-icon {
  width: 88px; height: 88px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.8rem;
  background: var(--paper-3);
  border: 1px solid var(--accent, var(--line-strong));
  border-radius: var(--radius-lg);
  position: relative;
  transition: border-color var(--t-slow) var(--ease-out);
}
.exam-hero-icon::before {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: var(--radius-lg);
  background: var(--accent, var(--amber));
  opacity: 0.15;
  z-index: -1;
  filter: blur(20px);
  animation: icon-pulse 3s ease-in-out infinite;
}
@keyframes icon-pulse {
  0%, 100% { opacity: 0.1; filter: blur(18px); }
  50% { opacity: 0.22; filter: blur(26px); }
}
.exam-hero-text h1 {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 0 0 var(--space-3);
}
.exam-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-5);
  align-items: center;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--ink-soft);
  letter-spacing: 0.05em;
}
.exam-hero-meta span { display: inline-flex; align-items: center; gap: var(--space-2); }
.exam-hero-meta strong { color: var(--accent, var(--ink)); font-weight: 700; font-variant-numeric: tabular-nums; font-size: 0.95em; }
/* meta 项之间的 accent 色分隔点 */
.exam-hero-meta span + span::before {
  content: '';
  display: inline-block;
  width: 3px; height: 3px;
  background: var(--accent, var(--ink-faint));
  border-radius: 50%;
  opacity: 0.5;
  margin-right: calc(var(--space-5) - var(--space-2));
}

/* exam hero meta — click to cycle 4 views (自身 / 套数 / 题数 / 规则 / 发现) */
.exam-hero-meta .meta-item {
  position: relative;
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 4px;
  transition: background 200ms var(--ease-out);
  outline: none;
  display: inline-flex;
  flex-direction: column;
  gap: 2px;
  align-items: flex-start;
}
.exam-hero-meta .meta-item:hover { background: rgba(244, 241, 232, 0.04); }
.exam-hero-meta .meta-item:focus-visible { background: rgba(244, 162, 97, 0.12); box-shadow: 0 0 0 2px var(--amber-glow); }
.exam-hero-meta .meta-item-top {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
}
.exam-hero-meta .meta-spark {
  width: 56px;
  height: 14px;
  position: relative;
  margin-top: 1px;
}
.exam-hero-actions-wrap { display: flex; gap: var(--space-3); flex-wrap: wrap; }

/* ================================================================
   Tab 导航
   ================================================================ */
.tab-nav-wrap {
  position: sticky;
  top: 64px;
  z-index: 50;
  background: rgba(10, 14, 26, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
  margin-bottom: var(--space-8);
}
.tab-nav {
  display: flex;
  gap: 0;
  position: relative;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.tab-nav::-webkit-scrollbar { display: none; }
.tab-link {
  padding: var(--space-5) var(--space-6);
  background: transparent;
  border: 0;
  color: var(--ink-soft);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 500;
  position: relative;
  white-space: nowrap;
  transition: color var(--t) var(--ease-out);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 56px;
}
.tab-link::before {
  content: attr(data-num);
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  color: var(--ink-faint);
  letter-spacing: 0.1em;
  opacity: 0.6;
  transition: all var(--t) var(--ease-out);
}
.tab-link:hover { color: var(--ink); }
.tab-link.active { color: var(--accent, var(--amber)); }
.tab-link.active::before { color: var(--accent, var(--amber)); opacity: 1; }
.tab-link-underline {
  position: absolute;
  bottom: 0;
  height: 2px;
  background: var(--accent, var(--amber));
  transition: all 400ms var(--ease-out);
  box-shadow: 0 0 8px var(--accent-glow, var(--amber-glow));
}
/* 折叠默认收起的 panel: off-screen 时浏览器跳过渲染/绘制, 切到 active 才重计算 */
.method-body {
  content-visibility: auto;
  contain-intrinsic-size: 0 120px;  /* 占位高度, 避免滚动条跳 */
}

/* Off-screen tab panel: 同样跳过渲染, 切回来再算 */
.tab-panel:not(.active) { content-visibility: hidden; }
.tab-panel.active { content-visibility: visible; display: block; }
.tab-panel { display: none; animation: tab-fade-in 400ms var(--ease-out); }
.tab-panel.active { display: block; }
@keyframes tab-fade-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ================================================================
   控制面板
   ================================================================ */
.control-panel {
  background: var(--paper-3);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-5);
  flex-wrap: wrap;
  margin-bottom: var(--space-7);
}
.control-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--ink-faint);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.control-label::before {
  content: '';
  width: 5px; height: 5px;
  background: var(--accent, var(--amber));
  border-radius: 50%;
  box-shadow: 0 0 6px var(--accent, var(--amber));
}
.control-toggles { display: flex; gap: var(--space-2); flex-wrap: wrap; }
.toggle-pill {
  padding: var(--space-2) var(--space-5);
  background: var(--paper-4);
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  color: var(--ink-soft);
  font-size: var(--text-sm);
  font-weight: 500;
  transition: all var(--t) var(--ease-out);
  min-height: 36px;
}
.toggle-pill:hover { border-color: var(--line-strong); color: var(--ink); }
.toggle-pill.active {
  background: var(--accent-glow, var(--amber-glow));
  border-color: var(--accent, var(--amber));
  color: var(--accent, var(--amber));
  box-shadow: 0 0 12px var(--accent-glow, var(--amber-glow));
}

/* ================================================================
   Era 时间线
   ================================================================ */
.era-timeline {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(220px, 100%), 1fr));
  gap: var(--space-4);
  position: relative;
}
.era-cell {
  background: var(--paper-3);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  position: relative;
  overflow: hidden;
  transition: all var(--t-slow) var(--ease-out);
}
.era-cell::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--era-color, var(--mint));
}
.era-cell.era-complete { --era-color: var(--mint); }
.era-cell.era-partial { --era-color: var(--amber); }
.era-cell.era-missing { --era-color: var(--crimson); }
.era-cell:hover { transform: translateY(-3px); border-color: var(--line-strong); }
.era-num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--ink-faint);
  letter-spacing: 0.2em;
  font-weight: 700;
  margin-bottom: var(--space-4);
}
.era-name {
  font-family: var(--font-display);
  font-size: var(--text-md);
  font-weight: 800;
  color: var(--ink);
  margin-bottom: var(--space-2);
  letter-spacing: -0.01em;
}
.era-years {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--era-color, var(--mint));
  letter-spacing: 0.08em;
  margin-bottom: var(--space-5);
}
.era-bar {
  height: 6px;
  background: var(--paper-4);
  border-radius: var(--radius-pill);
  overflow: hidden;
  margin-bottom: var(--space-3);
  position: relative;
}
.era-bar-fill {
  height: 100%;
  background: var(--era-color, var(--mint));
  border-radius: var(--radius-pill);
  width: 0;
  transition: width 1.2s var(--ease-out);
  box-shadow: 0 0 8px var(--era-color, var(--mint));
}
.era-stats {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}
.era-stats-label { color: var(--ink-faint); letter-spacing: 0.05em; }
.era-stats-value { color: var(--ink); font-weight: 700; font-variant-numeric: tabular-nums; }
.era-note {
  font-size: var(--text-xs);
  color: var(--ink-soft);
  line-height: 1.6;
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--line);
}

/* ================================================================
   规则 — 横向比较条
   ================================================================ */
.rule-list { display: flex; flex-direction: column; gap: var(--space-3); }
.rule-row {
  background: var(--paper-3);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: var(--space-5) var(--space-6);
  display: grid;
  grid-template-columns: 130px 1fr 140px;
  gap: var(--space-5);
  align-items: center;
  transition: all var(--t) var(--ease-out);
}
@media (max-width: 720px) {
  .rule-row { grid-template-columns: 1fr; gap: var(--space-4); padding: var(--space-5); }
}
.rule-row:hover { border-color: var(--line-strong); background: var(--paper-4); }
.rule-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.3rem;
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  font-weight: 700;
  padding: 0.3rem 0.6rem;
  border-radius: var(--radius-sm);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  white-space: nowrap;
}
.rule-tag-choose { background: var(--mint-glow); color: var(--mint); border: 1px solid rgba(42, 157, 143, 0.3); }
.rule-tag-exclude { background: var(--crimson-glow); color: var(--crimson); border: 1px solid rgba(231, 111, 81, 0.3); }
.rule-body { min-width: 0; }
.rule-name {
  font-family: var(--font-display);
  font-size: var(--text-md);
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 0.3rem;
  letter-spacing: -0.01em;
}
.rule-desc {
  font-size: var(--text-sm);
  color: var(--ink-soft);
  line-height: 1.6;
  margin-bottom: var(--space-4);
}
.rule-bars {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.rule-bar-row {
  display: grid;
  grid-template-columns: 60px 1fr 50px;
  gap: var(--space-3);
  align-items: center;
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
}
.rule-bar-label { color: var(--ink-faint); letter-spacing: 0.08em; text-transform: uppercase; }
.rule-bar-track {
  height: 6px;
  background: var(--paper-4);
  border-radius: var(--radius-pill);
  overflow: hidden;
  position: relative;
}
.rule-bar-fill {
  height: 100%;
  border-radius: var(--radius-pill);
  width: 0;
  transition: width 1.2s var(--ease-out);
}
.rule-bar-fill.train { background: linear-gradient(to right, var(--ink-faint), var(--ink-soft)); }
.rule-bar-fill.test { background: linear-gradient(to right, var(--amber-dim), var(--amber-bright)); box-shadow: 0 0 8px var(--amber-glow-strong); }
.rule-bar-fill.test-bad { background: linear-gradient(to right, var(--crimson), #f09478); }
.rule-bar-value {
  font-weight: 700;
  color: var(--ink);
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.rule-rates {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: var(--space-2);
  text-align: right;
  font-family: var(--font-mono);
}
.rule-decay {
  font-size: var(--text-2xs);
  font-weight: 700;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}
.rule-decay.positive { background: var(--mint-glow); color: var(--mint); }
.rule-decay.negative { background: var(--crimson-glow); color: var(--crimson); }
.rule-decay.neutral { background: var(--paper-4); color: var(--ink-faint); }

/* rule row — click to expand 跨时期衰减趋势 */
.rule-row { cursor: pointer; }
.rule-row:focus-visible { outline: 2px solid var(--amber); outline-offset: 2px; }
.rule-row[data-expanded="1"] { grid-template-columns: 130px 1fr 140px; }
.rule-row[data-expanded="1"] .rule-desc { margin-bottom: var(--space-3); }
.rule-expand-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--paper-4);
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 14px;
  line-height: 1;
  margin-top: var(--space-2);
  transition: background 200ms, color 200ms, transform 280ms var(--ease-out);
}
.rule-row:hover .rule-expand-toggle { background: var(--amber-glow); color: var(--amber-bright); }
.rule-row[data-expanded="1"] .rule-expand-toggle {
  background: var(--amber); color: var(--paper-1);
  transform: rotate(45deg);
}
.rule-expand {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 380ms var(--ease-out), margin-top 380ms var(--ease-out), opacity 280ms ease;
  overflow: hidden;
  margin-top: 0;
  opacity: 0;
}
.rule-expand[aria-hidden="false"] {
  grid-template-rows: 1fr;
  margin-top: var(--space-4);
  opacity: 1;
}
.rule-expand > div { min-height: 0; }
.rule-expand-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: 0.05em;
}
.rule-expand-title {
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.rule-expand-decay {
  font-weight: 700;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  background: var(--paper-4);
  color: var(--ink-soft);
}
.rule-expand-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}
.rule-era-cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
  padding: 0.5rem 0.3rem;
  background: var(--paper-4);
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
}
.rule-era-cell.era-now {
  background: var(--amber-glow);
  border-color: rgba(244, 162, 97, 0.3);
}
.rule-era-label {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--ink-faint);
  letter-spacing: 0.1em;
}
.rule-era-bars {
  display: flex;
  gap: 3px;
  align-items: flex-end;
  height: 60px;
}
.rule-era-bar {
  width: 6px;
  background: linear-gradient(to top, var(--ink-faint), var(--ink-soft));
  border-radius: 2px 2px 0 0;
  transition: height 600ms var(--ease-out);
  cursor: help;
}
.rule-era-bar.test {
  background: linear-gradient(to top, var(--amber-dim), var(--amber-bright));
  box-shadow: 0 0 4px var(--amber-glow);
}
.rule-era-bar:hover { transform: scaleY(1.05); transform-origin: bottom; }
.rule-era-bar::after {
  content: attr(data-tip);
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  background: rgba(10, 14, 26, 0.95);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 3px 7px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity 140ms ease;
  z-index: 10;
  backdrop-filter: blur(8px);
}
.rule-era-bar { position: relative; }
.rule-era-bar:hover::after { opacity: 1; }
.rule-era-years {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--ink-faint);
  letter-spacing: 0.05em;
}
.rule-expand-legend {
  display: flex;
  gap: var(--space-4);
  align-items: center;
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--ink-faint);
  letter-spacing: 0.05em;
  flex-wrap: wrap;
}
.rule-expand-legend > span { display: inline-flex; align-items: center; gap: 0.3rem; }
.rule-legend-dot {
  width: 8px; height: 8px;
  border-radius: 2px;
  display: inline-block;
}
.rule-legend-dot.train { background: var(--ink-soft); }
.rule-legend-dot.test { background: var(--amber-bright); box-shadow: 0 0 4px var(--amber-glow); }
.rule-expand-msg {
  color: var(--ink-soft);
  font-style: normal;
  margin-left: auto;
}
@media (max-width: 768px) {
  .rule-expand-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ================================================================
   模型 — 折线图 + 列表
   ================================================================ */
.model-chart-wrap {
  background: var(--paper-3);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin-bottom: var(--space-7);
}
.model-chart-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-5);
  flex-wrap: wrap;
  gap: var(--space-3);
}
.model-chart-title {
  font-family: var(--font-display);
  font-size: var(--text-md);
  font-weight: 700;
  color: var(--ink);
}
.model-chart-legend {
  display: flex;
  gap: var(--space-5);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--ink-soft);
}
.model-chart-legend-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.model-chart-legend-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
}
.model-chart-legend-dot.train { background: var(--ink-soft); }
.model-chart-legend-dot.real { background: var(--amber); box-shadow: 0 0 8px var(--amber-glow); }
.model-chart {
  width: 100%;
  height: 280px;
  position: relative;
}
.model-list { display: flex; flex-direction: column; gap: var(--space-3); }
.model-row {
  background: var(--paper-3);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: var(--space-5) var(--space-6);
  display: grid;
  grid-template-columns: 60px 1fr 160px;
  gap: var(--space-5);
  align-items: center;
  transition: all var(--t) var(--ease-out);
}
@media (max-width: 720px) {
  .model-row { grid-template-columns: 50px 1fr; padding: var(--space-4); }
  .model-auc { grid-column: 2; }
}
.model-row:hover { border-color: var(--line-strong); background: var(--paper-4); }
.model-row { cursor: pointer; }
.model-row:focus-visible { outline: 2px solid var(--amber); outline-offset: 2px; }
.model-row.active {
  border-color: var(--amber);
  background: var(--amber-glow);
  box-shadow: 0 0 0 1px var(--amber-glow), 0 4px 16px rgba(244, 162, 97, 0.18);
  transform: translateX(2px);
}
.model-row.active .model-version { color: var(--amber-bright); }
/* lineChart 上的 vertical guide + label */
.model-guide {
  pointer-events: none;
  transition: opacity 220ms ease;
}
.model-chart { position: relative; }
.model-guide-label {
  position: absolute;
  top: 8px;
  transform: translateX(-50%);
  background: rgba(10, 14, 26, 0.95);
  color: var(--ink);
  border: 1px solid var(--amber);
  border-radius: 4px;
  padding: 6px 10px;
  font-family: 'Source Han Sans SC', sans-serif;
  font-size: 11px;
  line-height: 1.5;
  white-space: nowrap;
  pointer-events: none;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(8px);
  z-index: 10;
  animation: model-guide-in 280ms cubic-bezier(0.34, 1.56, 0.64, 1);
}
.model-guide-label strong { color: var(--amber-bright); font-family: 'JetBrains Mono', monospace; }
.model-guide-train { color: var(--ink-soft); font-size: 10px; font-family: 'JetBrains Mono', monospace; }
.model-guide-real { color: var(--amber); font-size: 10px; font-family: 'JetBrains Mono', monospace; }
@keyframes model-guide-in {
  0% { opacity: 0; transform: translateX(-50%) translateY(-4px); }
  100% { opacity: 1; transform: translateX(-50%) translateY(0); }
}
.model-version {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--amber);
  font-weight: 800;
  letter-spacing: 0.1em;
  background: var(--amber-glow);
  padding: 0.3rem 0.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-amber);
  text-align: center;
}
.model-name {
  font-family: var(--font-display);
  font-size: var(--text-md);
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 0.3rem;
}
.model-innov {
  font-size: var(--text-sm);
  color: var(--ink-soft);
  line-height: 1.5;
}
.model-auc {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
  font-family: var(--font-mono);
  text-align: right;
}
.model-auc-block { display: flex; flex-direction: column; }
.model-auc-value {
  font-size: var(--text-lg);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  line-height: 1;
}
.model-auc-value.train { color: var(--ink-soft); }
.model-auc-value.real { color: var(--amber); }
.model-auc-label {
  font-size: var(--text-2xs);
  color: var(--ink-faint);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-top: 0.25rem;
}

/* ================================================================
   审计卡片
   ================================================================ */
.audit-list { display: flex; flex-direction: column; gap: var(--space-4); }
.severity-donut {
  display: flex; align-items: center; gap: var(--space-6);
  padding: var(--space-5) var(--space-6);
  background: var(--paper2);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-5);
  flex-wrap: wrap;
}
.severity-donut-title {
  font-size: var(--text-xs); color: var(--ink-faint);
  text-transform: uppercase; letter-spacing: 0.08em;
  margin-bottom: var(--space-2);
}
.severity-donut-host { width: 140px; height: 140px; flex: 0 0 140px; }
.severity-donut-legend { display: flex; gap: var(--space-4); flex-wrap: wrap; }
.sev-legend-item {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: var(--text-sm); color: var(--ink-soft);
  font-family: 'JetBrains Mono', monospace;
}
.sev-legend-dot {
  width: 10px; height: 10px; border-radius: 50%;
  display: inline-block;
}
.sev-legend-dot.sev-critical { background: var(--crimson); }
.sev-legend-dot.sev-major { background: var(--amber); }
.sev-legend-dot.sev-minor { background: var(--mint); }
/* donut slice — hover 外扩 (path d 由 JS 切) */
.chart-severity-donut .slice { cursor: pointer; outline: none; transition: filter 200ms ease; }
.chart-severity-donut .slice:focus-visible { filter: drop-shadow(0 0 10px currentColor) !important; }
.audit-card {
  background: var(--paper-3);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: var(--space-6) var(--space-7);
  position: relative;
  overflow: hidden;
  transition: all var(--t-slow) var(--ease-out);
}
.audit-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 4px; height: 100%;
  background: var(--audit-color, var(--mint));
}
.audit-card.severity-critical { --audit-color: var(--crimson); }
.audit-card.severity-major { --audit-color: var(--amber); }
.audit-card.severity-minor { --audit-color: var(--mint); }
.audit-card:hover { transform: translateX(4px); border-color: var(--line-strong); }
.audit-head {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
  flex-wrap: wrap;
}
.audit-id {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  color: var(--ink-faint);
  letter-spacing: 0.1em;
  font-weight: 700;
}
.audit-severity {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.audit-severity.severity-critical { background: var(--crimson-glow); color: var(--crimson); }
.audit-severity.severity-major { background: var(--amber-glow); color: var(--amber); }
.audit-severity.severity-minor { background: var(--mint-glow); color: var(--mint); }
.audit-title {
  font-family: var(--font-display);
  font-size: var(--text-md);
  font-weight: 700;
  color: var(--ink);
  flex: 1;
  min-width: 200px;
  line-height: 1.5;
}
.audit-compare {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(220px, 100%), 1fr));
  gap: var(--space-4);
}
.audit-block {
  background: var(--paper-4);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: var(--space-4) var(--space-5);
}
.audit-block-label {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: 0.1em;
  color: var(--ink-faint);
  text-transform: uppercase;
  margin-bottom: 0.4rem;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.audit-block-label::before {
  content: '';
  width: 4px; height: 4px;
  background: currentColor;
  border-radius: 50%;
}
.audit-block.audit-before { color: var(--crimson); }
.audit-block.audit-after { color: var(--mint); }
.audit-block.audit-fix { color: var(--amber); }
.audit-block-text {
  font-size: var(--text-sm);
  color: var(--ink);
  line-height: 1.55;
}

/* ================================================================
   技术 — 折叠卡
   ================================================================ */
.tech-grid { display: flex; flex-direction: column; gap: var(--space-3); }

/* ================================================================
   状态: loading / empty / error
   ================================================================ */
.state-card {
  text-align: center;
  padding: var(--space-10) var(--space-7);
  background: var(--paper-3);
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius-lg);
  color: var(--ink-soft);
}
.state-icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-4);
  opacity: 0.6;
  display: inline-block;
}
.state-title {
  font-family: var(--font-display);
  font-size: var(--text-md);
  font-weight: 700;
  color: var(--ink);
  margin-bottom: var(--space-3);
}
.state-msg {
  font-size: var(--text-sm);
  color: var(--ink-faint);
  max-width: 480px;
  margin: 0 auto;
  line-height: 1.6;
}
.state-card.error {
  border-style: solid;
  border-color: rgba(231, 111, 81, 0.3);
  background: var(--crimson-glow);
}
.state-card.error .state-icon { color: var(--crimson); opacity: 1; }
.state-card.loading .state-icon { animation: spin 1.2s linear infinite; color: var(--amber); opacity: 1; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ErrorBoundary fallback (shared.js safeRender) */
.error-card {
  text-align: center;
  padding: var(--space-8) var(--space-6);
  background: var(--crimson-glow);
  border: 1px solid rgba(231, 111, 81, 0.35);
  border-radius: var(--radius-lg);
  color: var(--ink);
}
.error-card .error-icon {
  font-size: 2.4em;
  color: var(--crimson);
  margin-bottom: var(--space-3);
  opacity: 0.9;
}
.error-card .error-title {
  font-size: var(--text-md);
  font-weight: 600;
  color: var(--ink);
  margin-bottom: var(--space-2);
}
.error-card .error-detail {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--ink-soft);
  word-break: break-all;
  max-width: 480px;
  margin: 0 auto;
}

/* ================================================================
   noscript
   ================================================================ */
.noscript-banner {
  background: var(--crimson);
  color: white;
  text-align: center;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 600;
  position: relative;
  z-index: 1000;
}

/* ================================================================
   页脚
   ================================================================ */
.footer {
  border-top: 1px solid var(--line);
  padding: var(--space-9) 0 var(--space-7);
  margin-top: var(--space-12);
  color: var(--ink-faint);
  font-size: var(--text-sm);
  background: linear-gradient(180deg, transparent 0%, var(--paper-2) 100%);
  position: relative;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-8);
  align-items: start;
  margin-bottom: var(--space-7);
}
@media (max-width: 720px) {
  .footer-grid { grid-template-columns: 1fr; gap: var(--space-6); }
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-size: var(--text-md);
  font-weight: 800;
  color: var(--ink);
  margin-bottom: var(--space-3);
  letter-spacing: 0.12em;
}
.footer-brand-dot {
  width: 8px; height: 8px;
  background: var(--amber);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--amber);
}
.footer-desc {
  font-size: var(--text-sm);
  color: var(--ink-soft);
  line-height: 1.6;
  max-width: 320px;
}
.footer-col h4 {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  color: var(--ink-faint);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: var(--space-4);
  font-weight: 700;
}
.footer-col ul { display: flex; flex-direction: column; gap: var(--space-3); }
.footer-col a {
  color: var(--ink-soft);
  font-size: var(--text-sm);
  transition: color var(--t) var(--ease-out);
}
.footer-col a:hover { color: var(--amber); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-6);
  border-top: 1px solid var(--line);
  font-size: var(--text-xs);
  color: var(--ink-faint);
  flex-wrap: wrap;
  gap: var(--space-3);
}

/* ================================================================
   滚动揭示动画
   ================================================================ */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 800ms var(--ease-out), transform 800ms var(--ease-out);
}
[data-reveal].revealed {
  opacity: 1;
  transform: translateY(0);
}
[data-reveal-delay="1"] { transition-delay: 80ms; }
[data-reveal-delay="2"] { transition-delay: 160ms; }
[data-reveal-delay="3"] { transition-delay: 240ms; }
[data-reveal-delay="4"] { transition-delay: 320ms; }
[data-reveal-delay="5"] { transition-delay: 400ms; }

@keyframes float-up {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ================================================================
   跨页跳转过渡 (View Transitions API) + 页面 enter + 锚链接高亮
   ================================================================ */
/* 跨页 cross-fade: 默认 280ms 柔和淡入淡出 */
::view-transition-old(root),
::view-transition-new(root) {
  animation-duration: 280ms;
  animation-timing-function: cubic-bezier(0.16, 1, 0.3, 1);
}
::view-transition-old(root) {
  animation-name: vt-fade-out;
}
::view-transition-new(root) {
  animation-name: vt-fade-in;
}
@keyframes vt-fade-out {
  from { opacity: 1; }
  to   { opacity: 0; }
}
@keyframes vt-fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* 首屏 enter 动画 — 整页 fade-up, 避免 FOUC, 加仪式感 */
html { opacity: 0; }
html.page-entered { animation: page-enter 600ms cubic-bezier(0.16, 1, 0.3, 1) forwards; }
@keyframes page-enter {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* 锚链接跳转目标高亮脉冲 (Motion.linkTransition 加 .target-pulse 临时 class) */
.target-pulse {
  animation: target-pulse 1.6s cubic-bezier(0.16, 1, 0.3, 1);
}
@keyframes target-pulse {
  0%   { box-shadow: 0 0 0 0 rgba(244, 162, 97, 0); }
  15%  { box-shadow: 0 0 0 8px rgba(244, 162, 97, 0.18); }
  45%  { box-shadow: 0 0 0 16px rgba(244, 162, 97, 0.06); }
  100% { box-shadow: 0 0 0 0 rgba(244, 162, 97, 0); }
}

/* section / 锚目标 — sticky topnav (64px) + tab-nav (56px) 之外留余量 */
section[id], .section[id], [data-anchor-target] {
  scroll-margin-top: 80px;
}

/* ================================================================
   图表 hover tooltip (.chart-tip) + 跨页跳转 progress bar
   ================================================================ */
/* tooltip 浮层 — 显示在 sparkline / chart 上方 */
.chart-tip {
  position: absolute;
  pointer-events: none;
  z-index: 10;
  padding: 4px 8px;
  background: rgba(10, 14, 26, 0.95);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 4px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.05em;
  white-space: nowrap;
  transform: translateY(-100%);
  opacity: 0;
  transition: opacity 140ms ease;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}
.chart-tip.show { opacity: 1; }
.chart-tip::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: -4px;
  transform: translateX(-50%) rotate(45deg);
  width: 6px; height: 6px;
  background: rgba(10, 14, 26, 0.95);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

/* 跨页跳转顶部 progress bar — 1px 琥珀色, 跳转时从 0 跑到 100% */
.page-progress {
  position: fixed;
  top: 0; left: 0;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--amber) 0%, var(--amber-bright) 50%, var(--amber) 100%);
  box-shadow: 0 0 8px var(--amber-glow);
  z-index: 9999;
  pointer-events: none;
  transition: width 350ms cubic-bezier(0.16, 1, 0.3, 1), opacity 250ms ease;
  opacity: 0;
}
.page-progress.run { width: 100%; opacity: 1; }
.page-progress.done { width: 100%; opacity: 0; transition: opacity 380ms ease 80ms; }

/* 数字翻牌动画 (Motion.animateFlip) — 用于 tab 切换 / i18n 切换时数字变化 */
.flip-anim {
  animation: flip-num 380ms cubic-bezier(0.34, 1.56, 0.64, 1);
  display: inline-block;
  transform-origin: center;
}
@keyframes flip-num {
  0%   { opacity: 1; transform: translateY(0)    rotateX(0); }
  45%  { opacity: 0; transform: translateY(60%)  rotateX(-90deg); }
  55%  { opacity: 0; transform: translateY(-60%) rotateX(90deg); }
  100% { opacity: 1; transform: translateY(0)    rotateX(0); }
}

/* ================================================================
   打印 / PDF
   ================================================================ */
@media print {
  body { background: white; color: black; }
  .bg-grid, .bg-noise, .bg-glow, .bg-vignette,
  .topnav,
  .tab-nav-wrap, .control-panel, .exam-hero-actions-wrap,
  .method-toggle, .footer, .btn { display: none !important; }
  .tab-panel { display: block !important; page-break-after: always; }
  .method { break-inside: avoid; }
  .method.open .method-body { max-height: none !important; }
  .exam-card, .finding, .rule-row, .model-row, .audit-card { break-inside: avoid; border-color: #ccc !important; background: white !important; }
  section { padding: 1rem 0 !important; }
  a { color: black !important; text-decoration: none !important; }
  a[href^="http"]::after { content: " (" attr(href) ")"; font-size: 0.8em; opacity: 0.6; }
}

/* ================================================================
   减少动画 (无障碍)
   ================================================================ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  /* 跨页 view transition: 减少用户前庭刺激, 直接显示目标页 */
  ::view-transition-group(root),
  ::view-transition-old(root),
  ::view-transition-new(root) { animation: none !important; }
  /* 首屏 enter: 不淡入, 直接显示 */
  html { opacity: 1 !important; }
  /* 锚链接 target pulse: 不闪烁 */
  .target-pulse { box-shadow: none !important; animation: none !important; }
  /* 数字翻牌 + 跨页 progress bar: 跳过 */
  .flip-anim { animation: none !important; }
  .page-progress { display: none !important; }
}

/* ================================================================
   滚动进度条 (顶部 2px, accent 色)
   ================================================================ */
.scroll-progress {
  position: fixed;
  top: 0; left: 0;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--accent, var(--amber)), var(--accent-glow, var(--amber-bright)));
  box-shadow: 0 0 8px var(--accent-glow, var(--amber-glow));
  z-index: 300;
  pointer-events: none;
  transition: width 80ms linear;
}

/* ================================================================
   关键数字下方细 underline (数据房视觉锤)
   .num-underline / .hero-stat-num.num-underline
   ================================================================ */
.num-underline {
  position: relative;
  display: inline-block;
}
.num-underline::after {
  content: '';
  position: absolute;
  bottom: -0.08em;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent, var(--amber)) 30%, var(--accent, var(--amber)) 70%, transparent);
  opacity: 0.55;
}

/* ================================================================
   Exam status pill (hero 右侧)
   ================================================================ */
.exam-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.4em 0.9em;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink-soft);
  background: rgba(244, 241, 232, 0.02);
}
.exam-status-pill::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ink-faint);
}
.exam-status-pill.active {
  color: var(--mint);
  border-color: rgba(42, 157, 143, 0.3);
}
.exam-status-pill.active::before {
  background: var(--mint);
  box-shadow: 0 0 6px rgba(42, 157, 143, 0.6);
  animation: pulse 2.4s ease-in-out infinite;
}
.exam-status-pill.development {
  color: var(--saffron);
  border-color: rgba(233, 196, 106, 0.32);
}
.exam-status-pill.development::before {
  background: var(--saffron);
}
.exam-status-pill.placeholder {
  color: var(--ink-faint);
}
.exam-status-pill.placeholder::before {
  background: var(--ink-faint);
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.7); }
}

/* ================================================================
   移动端详情页底部 tab bar (mobile only, 4 tab + active tab 同步)
   ================================================================ */
.mobile-tab-bar {
  display: none;
}
@media (max-width: 768px) {
  .mobile-tab-bar {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    position: fixed;
    bottom: 0; left: 0; right: 0;
    background: rgba(10, 14, 26, 0.96);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid var(--line);
    z-index: 100;
    padding: 0.5rem 0 calc(0.5rem + env(safe-area-inset-bottom));
  }
  /* active 滑动指示器 — 顶部 2px accent 色块, 跟随 active 按钮滑动 */
  .mt-indicator {
    position: absolute;
    top: 0; left: 0;
    height: 2px;
    width: 20%;
    background: var(--accent, var(--amber));
    box-shadow: 0 0 8px var(--accent-glow, var(--amber-glow));
    transition: transform 380ms cubic-bezier(0.34, 1.56, 0.64, 1);
    pointer-events: none;
    will-change: transform;
  }
  /* mobile 端顶部桌面 tab bar 隐藏 — 底部 mobile-tab-bar 已承担导航职责,
     避免双重 tab bar 冗余 */
  .tab-nav-wrap { display: none; }
  .mobile-tab-bar button {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.15rem;
    background: transparent;
    border: 0;
    color: var(--ink-faint);
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    padding: 0.4rem 0.2rem;
    cursor: pointer;
    transition: color 0.18s ease;
  }
  .mobile-tab-bar button .mt-num {
    font-size: 0.55rem;
    opacity: 0.6;
  }
  .mobile-tab-bar button.active {
    color: var(--accent, var(--amber));
  }
  /* 详情页内容给 bottom tab bar 留位 */
  body.has-mobile-tabbar {
    padding-bottom: calc(64px + env(safe-area-inset-bottom));
  }
  /* scroll progress 加 z-index 高于 mobile tab bar 的 100 */
}

/* ============================================================
   打印样式 · 让详情页 11 条规则 + 5 个模型 + 6 个审计 + 4 个方法
   在白纸上可读 (背景翻白 / 隐藏动效 / 强制展开折叠卡)
   ============================================================ */
@media print {
  /* 1. 整体翻白底 */
  :root, body, .topnav, .tab-nav-wrap, .tab-panel,
  .hero, .section, .exam-card, .rule-row, .model-row, .audit-card,
  .method-card, .finding, .era-cell, .chart-card, .control-panel,
  .state-card, footer {
    background: white !important;
    color: black !important;
    box-shadow: none !important;
    border-color: #ccc !important;
  }
  /* 2. 链接/标签/橙色强调转深色 */
  a, .lang-toggle, .section-eyebrow, .exam-status-pill,
  .rule-tag, .model-tag, .audit-tag, .method-tag,
  .finding-num, .era-num, .decay {
    color: black !important;
    border-color: #333 !important;
  }
  .accent, em { color: #b8550a !important; font-style: normal; }
  /* 3. 隐藏不需要打印的元素 */
  .topnav, .tab-nav-wrap, .mobile-tab-bar, .scroll-progress,
  .control-panel, .hero-actions, .actions, .lang-toggle,
  nav, button:not(.method-toggle) { display: none !important; }
  /* 4. 强制显示所有 tab-panel + 强制展开 method-card (打印时一屏全显示) */
  .tab-panel { display: block !important; page-break-after: always; }
  .tab-panel:last-child { page-break-after: auto; }
  .method-card { break-inside: avoid; border: 1px solid #999 !important; }
  .method-card .method-body { display: block !important; }
  .method-card .method-toggle { display: none !important; }
  /* 5. 强制所有 [data-reveal] 显示 (print 不会触发 IO + CSS animation) */
  [data-reveal] { opacity: 1 !important; transform: none !important; }
  /* 6. 数字保持大号 */
  .finding-num, .era-num { font-size: 32pt !important; }
  /* 7. 链接显示 URL */
  a[href^="http"]::after { content: " (" attr(href) ")"; font-size: 9pt; }
  /* 8. 表格友好: 规则行的 11 条不要断页 */
  .rule-row, .audit-card, .model-row, .finding, .era-cell {
    break-inside: avoid; page-break-inside: avoid;
  }
  /* 9. 字体偏好 */
  body { font-family: Georgia, "Times New Roman", serif !important; }
  /* 10. 边距 */
  @page { margin: 1.5cm 1.2cm; }
}

/* ============================================================
   键盘快捷键帮助浮层 (按 ? 弹)
   ============================================================ */
.kbd-help-modal {
  position: fixed; inset: 0; z-index: 1000;
  background: rgba(10, 11, 14, 0.7);
  display: flex; align-items: center; justify-content: center;
  backdrop-filter: blur(4px);
  animation: kbd-fade 0.18s ease;
}
.kbd-help-modal.hidden { display: none; }
.kbd-help-card {
  background: var(--paper, #15171c);
  border: 1px solid var(--line, rgba(244, 241, 232, 0.18));
  border-radius: 12px;
  padding: 28px 32px;
  min-width: 320px; max-width: 480px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}
.kbd-help-card h3 {
  margin: 0 0 18px 0;
  font-size: 18px;
  color: var(--accent, #f4a261);
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: 0.04em;
}
.kbd-help-card dl {
  margin: 0 0 20px 0;
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 10px 20px;
}
.kbd-help-card dt { display: flex; gap: 4px; align-items: center; }
.kbd-help-card dd { margin: 0; color: var(--ink-soft, #c5c0ad); font-size: 14px; }
.kbd-help-card kbd {
  display: inline-block;
  padding: 2px 8px;
  font: 12px/1.4 'JetBrains Mono', monospace;
  color: var(--amber, #f4a261);
  background: rgba(244, 162, 97, 0.1);
  border: 1px solid rgba(244, 162, 97, 0.4);
  border-radius: 4px;
  min-width: 22px;
  text-align: center;
}
.kbd-help-close {
  display: inline-block;
  padding: 8px 18px;
  font: 13px/1 'JetBrains Mono', monospace;
  color: var(--amber, #f4a261);
  background: rgba(244, 162, 97, 0.08);
  border: 1px solid rgba(244, 162, 97, 0.45);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
}
.kbd-help-close:hover {
  background: rgba(244, 162, 97, 0.18);
  border-color: var(--amber, #f4a261);
}
@keyframes kbd-fade {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* ============================================================
   数据完整度卡片
   ============================================================ */
.data-completeness-card {
  margin-top: var(--space-9);
  padding: var(--space-7);
  background: var(--paper-3, #141a2c);
  border: 1px solid var(--line, rgba(244, 241, 232, 0.08));
  border-radius: var(--radius-lg, 20px);
  position: relative;
  overflow: hidden;
}
.data-completeness-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--amber, #f4a261), var(--saffron, #e9c46a));
}
.data-completeness-head {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}
.data-completeness-icon {
  font-size: 2rem;
  line-height: 1;
}
.data-completeness-title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--ink, #f4f1e8);
  margin-bottom: var(--space-2);
}
.data-completeness-sub {
  font-size: var(--text-sm);
  color: var(--ink-soft, #c5c0ad);
}
.data-completeness-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--space-5);
  margin-bottom: var(--space-6);
}
.data-completeness-stat {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.data-completeness-num {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--amber, #f4a261);
  line-height: 1;
}
.data-completeness-label {
  font-size: var(--text-xs);
  color: var(--ink-soft, #c5c0ad);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.data-completeness-note {
  padding: var(--space-4);
  background: rgba(244, 162, 97, 0.05);
  border-left: 3px solid var(--amber, #f4a261);
  border-radius: var(--radius-sm, 6px);
}
.data-completeness-note p {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--ink-soft, #c5c0ad);
  line-height: 1.6;
}

/* ============================================================
   路线图列表
   ============================================================ */
.roadmap-list {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-6);
}
.roadmap-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  padding: var(--space-5);
  background: var(--paper-3, #141a2c);
  border: 1px solid var(--line, rgba(244, 241, 232, 0.08));
  border-radius: var(--radius, 12px);
  transition: all var(--t) var(--ease-out);
}
.roadmap-item:hover {
  border-color: var(--line-amber, rgba(244, 162, 97, 0.32));
  transform: translateX(4px);
}
.roadmap-num {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--amber, #f4a261);
  flex-shrink: 0;
  min-width: 2rem;
}
.roadmap-text {
  font-size: var(--text-base);
  color: var(--ink, #f4f1e8);
  line-height: 1.6;
}

/* ============================================================
   数据来源说明
   ============================================================ */
.data-source-note {
  margin-top: var(--space-9);
  padding: var(--space-6);
  background: rgba(231, 111, 81, 0.05);
  border: 1px solid rgba(231, 111, 81, 0.2);
  border-radius: var(--radius, 12px);
}
.data-source-note-head {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}
.data-source-note-icon {
  font-size: 1.5rem;
}
.data-source-note-title {
  font-size: var(--text-md);
  font-weight: 600;
  color: var(--crimson, #e76f51);
}
.data-source-note-body p {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--ink-soft, #c5c0ad);
  line-height: 1.7;
}

/* ============================================================
   跨考试对比视图
   ============================================================ */
.comparison-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
  margin-top: var(--space-6);
}
.comparison-card {
  background: var(--paper-3, #141a2c);
  border: 1px solid var(--line, rgba(244, 241, 232, 0.08));
  border-radius: var(--radius-lg, 20px);
  padding: var(--space-6);
  position: relative;
  overflow: hidden;
  transition: all var(--t) var(--ease-out);
}
.comparison-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent, var(--amber, #f4a261));
}
.comparison-card:hover {
  border-color: var(--accent, var(--amber, #f4a261));
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.comparison-card-head {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}
.comparison-icon {
  font-size: 2.5rem;
  line-height: 1;
}
.comparison-title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--ink, #f4f1e8);
  margin-bottom: var(--space-1);
}
.comparison-code {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--ink-soft, #c5c0ad);
}
.comparison-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}
.comparison-stat {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.comparison-num {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--accent, var(--amber, #f4a261));
  line-height: 1;
}
.comparison-label {
  font-size: var(--text-xs);
  color: var(--ink-soft, #c5c0ad);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.comparison-footer {
  padding-top: var(--space-4);
  border-top: 1px solid var(--line, rgba(244, 241, 232, 0.08));
}
.comparison-link {
  display: inline-block;
  font-size: var(--text-sm);
  color: var(--accent, var(--amber, #f4a261));
  text-decoration: none;
  font-weight: 500;
  transition: all var(--t) var(--ease-out);
}
.comparison-link:hover {
  color: var(--amber-bright, #f6b27a);
  transform: translateX(4px);
}