/* ============================================================
   分子胶 AI 课程 · 统一导航 / 字体 / 配色叠加层
   注入到每个页面，不改动正文结构。
   ============================================================ */

:root {
  /* —— 中文优先字体栈（系统字体，零加载、国内可靠）—— */
  --crs-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC",
    "WenQuanYi Micro Hei", system-ui, "Segoe UI", Roboto, sans-serif;
  --crs-serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", STSong,
    "SimSun", Georgia, "Times New Roman", serif;
  --crs-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", monospace;

  /* —— 统一的画布中性色（协调各章细微差异）—— */
  --crs-paper: #F5F0E5;
  --crs-paper-2: #EDE6D6;
  --crs-ink: #1d1812;
  --crs-ink-soft: #4a443a;
  --crs-mute: #7c7464;
  --crs-line: #ddd3bf;

  /* —— 导航尺寸 & 当前章节强调色（JS 注入 --crs-accent）—— */
  --crs-nav-h: 56px;
  --crs-side-w: 274px;
  --crs-accent: #c6451f;
}

/* —— 画布中性色协调（叠加在各页 :root 之后，等权重靠后者生效）—— */
.crs-on:root,
html.crs-on {
  --paper: var(--crs-paper) !important;
  --paper-2: var(--crs-paper-2) !important;
  --ink: var(--crs-ink) !important;
  --line: var(--crs-line) !important;
}

/* ============ 全局字体统一（系统中文字体优先）============ */
html.crs-on body,
html.crs-on p, html.crs-on li, html.crs-on td, html.crs-on th,
html.crs-on div, html.crs-on span, html.crs-on a, html.crs-on small,
html.crs-on strong, html.crs-on em, html.crs-on b, html.crs-on label,
html.crs-on input, html.crs-on button, html.crs-on select, html.crs-on textarea,
html.crs-on blockquote, html.crs-on figcaption, html.crs-on caption,
html.crs-on dt, html.crs-on dd, html.crs-on section, html.crs-on article,
html.crs-on h1, html.crs-on h2, html.crs-on h3,
html.crs-on h4, html.crs-on h5, html.crs-on h6 {
  font-family: var(--crs-sans) !important;
}
/* 仅大标题用衬线，增加层次（系统衬线 CJK 在大字号下表现好）*/
html.crs-on .hero h1,
html.crs-on header h1,
html.crs-on h1.title,
html.crs-on .title,
html.crs-on .sb-brand h1 {
  font-family: var(--crs-serif) !important;
  letter-spacing: .01em;
}
html.crs-on code, html.crs-on pre, html.crs-on kbd, html.crs-on samp,
html.crs-on tt, html.crs-on .mono, html.crs-on [class*="mono"] {
  font-family: var(--crs-mono) !important;
}
html.crs-on body {
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ============ 隐藏各页自带的旧导航 ============ */
.crs-on #top,
.crs-on .mnav,
.crs-on aside.rail,
.crs-on nav.side,
.crs-on header.topbar,
.crs-on aside.sidebar,
.crs-on aside#sidebar {
  display: none !important;
}
/* 折叠各页 sidebar+main 的两列栅格，让正文占满 */
.crs-on .shell { display: block !important; }
.crs-on.page-02 .wrap { display: block !important; }

/* ============ 页面偏移，给固定顶栏 / 左栏让位 ============ */
.crs-on body {
  padding-top: var(--crs-nav-h) !important;
}
@media (min-width: 1080px) {
  .crs-on.crs-has-toc body {
    padding-left: var(--crs-side-w) !important;
  }
}

/* ============ 顶部：阅读进度条 ============ */
.crs-progress {
  position: fixed; top: 0; left: 0; height: 3px; width: 0;
  background: var(--crs-accent); z-index: 1002;
  transition: width .12s linear;
}

/* ============ 顶栏：全章导航 ============ */
.crs-topbar {
  position: fixed; top: 0; left: 0; right: 0; height: var(--crs-nav-h);
  z-index: 1001; display: flex; align-items: center; gap: 14px;
  padding: 0 18px;
  background: color-mix(in srgb, var(--crs-paper) 88%, transparent);
  -webkit-backdrop-filter: saturate(140%) blur(12px);
  backdrop-filter: saturate(140%) blur(12px);
  border-bottom: 1px solid var(--crs-line);
  box-shadow: 0 1px 0 rgba(255,255,255,.5) inset;
}
.crs-brand {
  display: flex; align-items: center; gap: 9px; flex-shrink: 0;
  font-weight: 800; font-size: 15px; color: var(--crs-ink);
  letter-spacing: .01em; white-space: nowrap;
}
.crs-brand .dot {
  width: 11px; height: 11px; border-radius: 50%;
  background: var(--crs-accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--crs-accent) 22%, transparent);
}
.crs-brand b { color: var(--crs-accent); }
.crs-chapters {
  display: flex; align-items: center; gap: 2px; overflow-x: auto;
  flex: 1; scrollbar-width: none; -ms-overflow-style: none;
  mask-image: linear-gradient(90deg, transparent 0, #000 14px, #000 calc(100% - 14px), transparent 100%);
}
/* 桌面：品牌居左、章节导航居中（三栏栅格，两侧 1fr 等宽，中列自然居中）*/
@media (min-width: 1080px) {
  .crs-topbar { display: grid; grid-template-columns: 1fr auto 1fr; gap: 16px; }
  .crs-brand { grid-column: 1; justify-self: start; }
  .crs-chapters { grid-column: 2; justify-self: center; flex: 0 1 auto; max-width: 100%; }
}
.crs-chapters::-webkit-scrollbar { display: none; }
.crs-chapters a {
  flex-shrink: 0; padding: 7px 12px; border-radius: 8px;
  font-size: 13.5px; font-weight: 600; color: var(--crs-ink-soft);
  white-space: nowrap; position: relative; transition: background .14s, color .14s;
}
.crs-chapters a small {
  font-weight: 700; opacity: .55; margin-right: 4px; font-variant-numeric: tabular-nums;
}
.crs-chapters a:hover { background: color-mix(in srgb, var(--crs-ink) 7%, transparent); color: var(--crs-ink); }
.crs-chapters a.active {
  color: #fff; background: var(--crs-accent);
}
.crs-chapters a.active small { opacity: .8; color: #fff; }

/* 移动端目录按钮 */
.crs-menu-btn {
  display: none; flex-shrink: 0; border: 1px solid var(--crs-line);
  background: #fff; color: var(--crs-ink); border-radius: 8px;
  padding: 7px 11px; font-size: 13px; font-weight: 700; cursor: pointer;
  align-items: center; gap: 6px;
}

/* ============ 左栏：本章节导航 ============ */
.crs-side {
  position: fixed; top: var(--crs-nav-h); left: 0; bottom: 0;
  width: var(--crs-side-w); z-index: 999;
  background: linear-gradient(180deg,
    color-mix(in srgb, var(--crs-paper) 60%, #fff),
    var(--crs-paper));
  border-right: 1px solid var(--crs-line);
  overflow-y: auto; overscroll-behavior: contain;
  padding: 20px 14px 60px;
}
.crs-side::-webkit-scrollbar { width: 9px; }
.crs-side::-webkit-scrollbar-thumb {
  background: color-mix(in srgb, var(--crs-mute) 45%, transparent);
  border-radius: 8px; border: 3px solid transparent; background-clip: padding-box;
}
.crs-side-eyebrow {
  font-size: 11px; letter-spacing: .14em; text-transform: uppercase;
  color: var(--crs-accent); font-weight: 700; margin: 2px 8px 4px;
}
.crs-side-title {
  font-size: 16px; font-weight: 800; color: var(--crs-ink);
  line-height: 1.35; margin: 0 8px 14px; padding-bottom: 12px;
  border-bottom: 1px solid var(--crs-line);
}
.crs-toc { display: flex; flex-direction: column; gap: 1px; }
.crs-toc a {
  display: block; position: relative; padding: 7px 10px 7px 14px;
  border-radius: 7px; font-size: 13.5px; line-height: 1.5;
  color: var(--crs-ink-soft); font-weight: 500;
  transition: background .13s, color .13s;
}
.crs-toc a:hover { background: color-mix(in srgb, var(--crs-accent) 9%, transparent); color: var(--crs-ink); }
.crs-toc a.sub {
  padding-left: 26px; font-size: 12.5px; color: var(--crs-mute); font-weight: 500;
}
.crs-toc a.head {
  font-weight: 800; color: var(--crs-ink); font-size: 13px;
  letter-spacing: .01em; margin-top: 12px; padding-bottom: 3px;
}
.crs-toc a.head:first-child { margin-top: 0; }
.crs-toc a.active {
  color: var(--crs-accent); font-weight: 700;
  background: color-mix(in srgb, var(--crs-accent) 12%, transparent);
}
.crs-toc a.active::before {
  content: ""; position: absolute; left: 4px; top: 50%; transform: translateY(-50%);
  width: 3px; height: 60%; border-radius: 3px; background: var(--crs-accent);
}
.crs-side-home {
  display: inline-flex; align-items: center; gap: 6px; margin: 0 8px 16px;
  font-size: 12.5px; font-weight: 600; color: var(--crs-mute);
}
.crs-side-home:hover { color: var(--crs-accent); }

.crs-scrim {
  display: none; position: fixed; inset: 0; z-index: 998;
  background: rgba(20,16,10,.42); -webkit-backdrop-filter: blur(2px); backdrop-filter: blur(2px);
}

/* ============================================================
   设计规范统一 · 把各章强调色对齐到基准三色
   基准（取自首页/第四篇）：橙 #c6451f · 青 #1f5e57 · 金 #a8821f
   仅覆盖 CSS 变量（含浅色/深色变体与暗色面板），不改结构，可逆。
   ============================================================ */

/* —— 第〇篇 导论：本就接近，仅微调 rust→橙、统一青/金 —— */
html.page-00 {
  --rust: #c6451f !important;       --rust-soft: #f4ddd2 !important;
  --teal: #1f5e57 !important;       --teal-deep: #163f3a !important; --teal-soft: #e2eee9 !important;
  --amber: #a8821f !important;      --amber-deep: #7e5212 !important; --amber-soft: #f6ecd9 !important;
  --line-strong: #cabfa6 !important; --ink-faint: #7c7464 !important;
}

/* —— 第一篇 生物根基：冷蓝→暖；亮青/珊瑚/紫 → 基准三色 —— */
html.page-01 {
  --ink2: #2a241c !important;  --ink3: #4a443a !important;
  --txt:  #1d1812 !important;  --txt2: #4a443a !important;
  --teal: #1f5e57 !important;  --teal-d: #163f3a !important; --teal-l: #e2eee9 !important;
  --coral:#c6451f !important;  --coral-d:#9c3415 !important; --coral-l:#f4ddd2 !important;
  --gold: #a8821f !important;  --gold-d: #7e5212 !important;
  --purple:#2c7d73 !important; --purple-l:#e2eee9 !important;
  --card: #fbf8f0 !important;  --card2: #f3ecdb !important;
  --line: #ddd3bf !important;  --line2: #cabfa6 !important;
  --muted:#7c7464 !important;  --ans: #e2eee9 !important;
}

/* —— 第二篇 AI 工具箱：navy 深色面板→暖深；青/紫/绿/红 → 基准三色 —— */
html.page-02 {
  --navy: #26201a !important;  --navy-2: #2f2720 !important;
  --teal: #1f5e57 !important;  --teal-dk: #163f3a !important; --teal-tint: #e2eee9 !important;
  --amber:#a8821f !important;  --amber-soft:#caa23a !important; --amber-tint:#f6ecd9 !important;
  --violet:#2c7d73 !important; --violet-dk:#163f3a !important;
  --green: #2c7d73 !important; --green-tint:#e2eee9 !important;
  --red:   #c6451f !important; --red-tint: #f4ddd2 !important;
  --muted: #7c7464 !important; --faint: #a89e8b !important;
}

/* —— 第三篇 数据层：navy 深色面板→暖深；青/琥珀/珊瑚 → 基准三色 —— */
html.page-03 {
  --navy: #26201a !important;  --navy2: #2f2720 !important; --panel: #352c22 !important;
  --teal: #1f5e57 !important;  --teal2: #2c7d73 !important;
  --amber:#a8821f !important;  --coral: #c6451f !important;
  --mist: #e2eee9 !important;  --muted: #7c7464 !important;
  --amberink:#7e5212 !important; --greenink:#163f3a !important;
}

/* ============ 首页（门户）单独设计 ============ */
/* 首页为全宽落地页，自带完整布局（见 index.html），此处仅保留顶栏调性。
   旧版的强制居中规则（hero/laws/stats/sec-title/path 居中）已移除，
   交由 index.html 的全宽分区布局自行控制。 */
/* 首页无章节目录：脚本仍会插入一个空的 .crs-side 浮层（固定在左侧、带背景），
   会盖住首页 Hero 左侧内容 —— 在门户页强制隐藏它与其遮罩。 */
.page-index .crs-side,
.page-index .crs-scrim { display: none !important; }

/* 首页顶栏更轻盈、与 Hero 融为一体（去描边、半透明）*/
.page-index .crs-topbar {
  background: color-mix(in srgb, var(--crs-paper) 72%, transparent);
  border-bottom-color: transparent;
}
.page-index .crs-topbar.crs-scrolled {
  background: color-mix(in srgb, var(--crs-paper) 90%, transparent);
  border-bottom-color: var(--crs-line);
}

/* ============ 响应式 ============ */
@media (max-width: 1079px) {
  .crs-menu-btn { display: inline-flex; }
  .crs-side {
    transform: translateX(-100%);
    transition: transform .26s cubic-bezier(.4,0,.2,1);
    box-shadow: 0 16px 50px -12px rgba(20,16,10,.4);
    width: min(300px, 86vw);
  }
  .crs-on.crs-side-open .crs-side { transform: translateX(0); }
  .crs-on.crs-side-open .crs-scrim { display: block; }
}
@media (max-width: 560px) {
  .crs-brand { font-size: 13.5px; }
  .crs-brand .label-long { display: none; }
  .crs-topbar { gap: 8px; padding: 0 12px; }
}

/* 锚点跳转时不被固定顶栏遮住 */
.crs-on :target { scroll-margin-top: calc(var(--crs-nav-h) + 14px); }
.crs-on [id] { scroll-margin-top: calc(var(--crs-nav-h) + 14px); }