/* ============================================================
   TRAE 绿皮书站点 · 深色"夜间森林终端"主题
   Night Forest Terminal Aesthetic
   ============================================================ */

:root {
  /* 核心色板 */
  --bg: #0A120D;              /* 深夜森林底色 */
  --bg-raised: #0F1B13;       /* 抬升面 */
  --bg-card: #12221A;         /* 卡片面 */
  --ink: #E4F2E8;             /* 主文字：雾绿白 */
  --ink-dim: #9DBFA9;         /* 次要文字 */
  --muted: #5F7D6A;           /* 弱提示 */
  --rule: #1E3328;            /* 分隔线 */
  --accent: #3DDC84;          /* 荧光绿 */
  --accent-soft: #6EE7A0;     /* 柔光绿 */
  --accent-dim: #1B5E3A;      /* 暗绿 */
  --amber: #F2B84B;           /* 琥珀警示 */
  --cyan: #58C4C7;            /* 信息青 */

  /* 字体 */
  --font-display: "Avenir Next Condensed", "PingFang SC", "Noto Sans CJK SC", sans-serif;
  --font-body: "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;

  /* 布局 */
  --sidebar-w: 264px;
  --content-max: 860px;
  --radius: 10px;
}

/* ---------- 基础重置 ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 84px; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  /* 噪点纹理 + 暗角氛围 */
  background-image:
    radial-gradient(1200px 600px at 85% -10%, rgba(61, 220, 132, 0.07), transparent 60%),
    radial-gradient(900px 500px at -10% 110%, rgba(61, 220, 132, 0.05), transparent 55%);
  background-attachment: fixed;
}

/* 细网格扫描纹理覆盖层 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(rgba(61, 220, 132, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(61, 220, 132, 0.025) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at 50% 0%, black 30%, transparent 75%);
}

::selection { background: rgba(61, 220, 132, 0.28); color: #EAFFF2; }

a { color: var(--accent-soft); text-decoration: none; }
a:hover { color: var(--accent); }

/* ============================================================
   章节页面布局
   ============================================================ */

/* ---------- 左侧站点导航 ---------- */
.site-nav {
  position: fixed;
  top: 0; left: 0; bottom: 0;
  width: var(--sidebar-w);
  background: rgba(10, 18, 13, 0.92);
  backdrop-filter: blur(12px);
  border-right: 1px solid var(--rule);
  padding: 28px 0 24px;
  overflow-y: auto;
  z-index: 100;
  display: flex;
  flex-direction: column;
}

.nav-brand {
  padding: 0 24px 20px;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 14px;
}

.nav-brand .brand-mark {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--accent);
  display: block;
  margin-bottom: 6px;
}

.nav-brand .brand-title {
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 800;
  color: var(--ink);
  letter-spacing: 0.04em;
}

.nav-brand .brand-title em { color: var(--accent); font-style: normal; }

.nav-group { padding: 10px 0 4px; }

.nav-group-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--muted);
  padding: 8px 24px 6px;
  display: block;
}

.site-nav ul { list-style: none; }

.site-nav > ul > li > a,
.site-nav .nav-group a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 24px;
  font-size: 14px;
  color: var(--ink-dim);
  border-left: 2px solid transparent;
  transition: all 0.18s ease;
}

.site-nav a .ch-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
  flex-shrink: 0;
}

.site-nav a:hover {
  color: var(--ink);
  background: rgba(61, 220, 132, 0.06);
}

.site-nav a.active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: rgba(61, 220, 132, 0.08);
}

.site-nav a.active .ch-tag { color: var(--accent); }

/* ===== 多级嵌套树导航 ===== */
.nav-scroll { flex: 1; overflow-y: auto; }

.nav-tree { list-style: none; padding: 6px 0; }
.nav-tree .nav-node { margin: 0; }

/* 顶层分类（level1） */
.nav-tree > .nav-node > .nav-cat {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--accent);
  padding: 14px 24px 6px;
  text-transform: uppercase;
}
.nav-tree > .nav-node > .nav-leaf {
  font-weight: 600;
}

/* 各级子列表 */
.nav-tree .nav-sub { list-style: none; margin: 0; padding: 0; }
.nav-tree .nav-sub .nav-sub { padding-left: 0; }

/* level2 */
.nav-tree > .nav-node > .nav-sub > .nav-node > .nav-leaf,
.nav-tree > .nav-node > .nav-sub > .nav-node > .nav-cat {
  display: block;
  padding: 6px 24px 6px 24px;
  font-size: 13.5px;
  color: var(--ink-dim);
}
.nav-tree > .nav-node > .nav-sub > .nav-node > .nav-cat {
  color: var(--muted);
  font-size: 12px;
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  padding-top: 8px;
}

/* level3 及更深：缩进 + 参考线 */
.nav-tree .nav-sub .nav-sub .nav-node > .nav-leaf {
  display: block;
  padding: 4px 24px 4px 40px;
  font-size: 12.5px;
  color: var(--muted);
  position: relative;
}
.nav-tree .nav-sub .nav-sub .nav-node > .nav-leaf::before {
  content: "";
  position: absolute;
  left: 28px; top: 0; bottom: 0;
  width: 1px;
  background: var(--rule);
}

/* level4 */
.nav-tree .nav-sub .nav-sub .nav-sub .nav-node > .nav-leaf {
  padding-left: 56px;
  font-size: 12px;
}

.nav-tree a.nav-leaf { text-decoration: none; transition: color .15s; }
.nav-tree a.nav-leaf:hover { color: var(--accent-soft); }
.nav-tree a.nav-leaf.active { color: var(--accent); font-weight: 600; }
.nav-tree a.nav-leaf.active::after { content: ""; }

.nav-footer {
  margin-top: auto;
  padding: 18px 24px 0;
  border-top: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.08em;
}

/* ---------- 移动端顶栏 ---------- */
.topbar {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 56px;
  background: rgba(10, 18, 13, 0.94);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--rule);
  z-index: 200;
  align-items: center;
  padding: 0 16px;
  gap: 14px;
}

.topbar .menu-btn {
  background: none;
  border: 1px solid var(--rule);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 7px 14px;
  border-radius: 6px;
  cursor: pointer;
  letter-spacing: 0.12em;
}

.topbar .brand-mini {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16px;
  color: var(--ink);
}

.topbar .brand-mini em { color: var(--accent); font-style: normal; }

/* ---------- 主内容列 ---------- */
.chapter-body {
  margin-left: var(--sidebar-w);
  position: relative;
  z-index: 1;
}

.chapter-content {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 56px 48px 80px;
}

/* 章节页头 */
.chapter-header { margin-bottom: 48px; }

.chapter-header .ch-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.28em;
  color: var(--accent);
  margin-bottom: 14px;
  display: block;
}

.chapter-header h1 {
  font-family: var(--font-display);
  font-size: clamp(30px, 4.5vw, 44px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: 0.01em;
  color: var(--ink);
  margin-bottom: 16px;
}

.chapter-header .ch-lede {
  font-size: 16.5px;
  color: var(--ink-dim);
  max-width: 640px;
  border-left: 3px solid var(--accent-dim);
  padding-left: 18px;
}

/* ---------- 章节正文排版 ---------- */
.chapter-content section > h1 { display: none; }  /* 章节大标题由 chapter-header 承担 */

.chapter-content h2 {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 800;
  color: var(--ink);
  margin: 56px 0 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--rule);
  position: relative;
}

.chapter-content h2::before {
  content: "";
  position: absolute;
  left: 0; bottom: -1px;
  width: 56px; height: 2px;
  background: var(--accent);
}

.chapter-content h3 {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--accent-soft);
  margin: 36px 0 12px;
}

.chapter-content p { margin: 0 0 16px; color: var(--ink-dim); }

.chapter-content p strong, .chapter-content li strong { color: var(--ink); }

.chapter-content ul, .chapter-content ol {
  margin: 0 0 18px 22px;
  color: var(--ink-dim);
}

.chapter-content li { margin-bottom: 8px; }
.chapter-content li::marker { color: var(--accent); }

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; margin: 22px 0; }

.chapter-content table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
  margin: 22px 0;
  background: var(--bg-raised);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  overflow: hidden;
}

.chapter-content thead th {
  background: rgba(61, 220, 132, 0.1);
  color: var(--accent);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.04em;
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--rule);
}

.chapter-content tbody td {
  padding: 11px 16px;
  color: var(--ink-dim);
  border-bottom: 1px solid rgba(30, 51, 40, 0.6);
  vertical-align: top;
}

.chapter-content tbody tr:last-child td { border-bottom: none; }
.chapter-content tbody tr:hover { background: rgba(61, 220, 132, 0.04); }

/* ---------- 代码块 ---------- */
.code-block {
  margin: 24px 0;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  overflow: hidden;
  background: #07100A;
}

.code-block-title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--accent);
  padding: 10px 18px;
  background: rgba(61, 220, 132, 0.07);
  border-bottom: 1px solid var(--rule);
}

.code-block-title::before { content: ">_ "; color: var(--muted); }

.code-block pre {
  padding: 18px 20px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.75;
  color: #BFE3CB;
}

.code-block pre code { font-family: inherit; white-space: pre; }

/* 行内代码 */
.chapter-content p code, .chapter-content li code, .chapter-content td code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: rgba(61, 220, 132, 0.1);
  color: var(--accent-soft);
  padding: 2px 7px;
  border-radius: 5px;
}

/* ---------- 提示框 Callout ---------- */
.callout {
  margin: 26px 0;
  padding: 18px 22px;
  border-radius: var(--radius);
  border: 1px solid var(--rule);
  border-left-width: 3px;
  background: var(--bg-raised);
  font-size: 15px;
}

.callout .callout-title {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 14.5px;
  margin-bottom: 8px;
  letter-spacing: 0.03em;
}

.callout p { margin-bottom: 8px; color: var(--ink-dim); }
.callout p:last-child { margin-bottom: 0; }

.callout-tip { border-left-color: var(--accent); }
.callout-tip .callout-title { color: var(--accent); }

.callout-info { border-left-color: var(--cyan); }
.callout-info .callout-title { color: var(--cyan); }

.callout-warn { border-left-color: var(--amber); }
.callout-warn .callout-title { color: var(--amber); }

/* 引用块 */
.chapter-content blockquote {
  margin: 18px 0;
  padding: 12px 18px;
  border-left: 3px solid var(--accent-dim);
  background: rgba(61, 220, 132, 0.04);
  color: var(--ink-dim);
  font-size: 14.5px;
  border-radius: 0 8px 8px 0;
}

/* 图片占位 */
.img-ph {
  display: block;
  text-align: center;
  padding: 22px;
  margin: 16px 0;
  border: 1px dashed var(--rule);
  border-radius: 8px;
  color: var(--muted);
  font-size: 12.5px;
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
}

/* 全书目录分组 */
.toc-grid { grid-template-columns: repeat(3, 1fr); }
.toc-group {
  grid-column: 1 / -1;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--accent);
  margin: 26px 0 4px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--rule);
  display: flex;
  align-items: center;
  gap: 10px;
}
.toc-count {
  background: rgba(61,220,132,0.12);
  color: var(--accent);
  border-radius: 100px;
  font-size: 10px;
  padding: 2px 9px;
  letter-spacing: 0;
}
@media (max-width: 900px) { .toc-grid { grid-template-columns: repeat(2,1fr); } }
@media (max-width: 600px) { .toc-grid { grid-template-columns: 1fr; } }

/* 文档配图：编号占位 + 自动识别 */
.doc-img {
  margin: 24px 0;
  border: 1px solid var(--rule);
  border-radius: 10px;
  overflow: hidden;
  background: var(--bg-raised);
}
.doc-img img {
  display: block;
  width: 100%;
  height: 320px;
  object-fit: contain;
  background: var(--bg-card);
}
@media (max-width: 600px) {
  .doc-img img { height: 200px; }
}
.doc-img figcaption {
  padding: 10px 16px;
  font-size: 12px;
  color: var(--muted);
  font-family: var(--font-mono);
  border-top: 1px solid var(--rule);
  background: rgba(61,220,132,0.03);
}
/* 图片文件缺失时：显示占位框 */
.doc-img.img-missing img { display: none; }
.doc-img.img-missing::before {
  content: attr(data-img-id) ".jpg · 待放入图片";
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 120px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  background:
    repeating-linear-gradient(45deg, transparent, transparent 12px, rgba(61,220,132,0.04) 12px, rgba(61,220,132,0.04) 24px);
}
.doc-img.img-missing::after {
  content: "";
  width: 28px; height: 28px;
  position: absolute;
  margin-bottom: 44px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='28' height='28' viewBox='0 0 24 24' fill='none' stroke='%235F7D6A' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Crect x='3' y='3' width='18' height='18' rx='2'/%3E%3Ccircle cx='8.5' cy='8.5' r='1.5'/%3E%3Cpolyline points='21 15 16 10 5 21'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
}
.doc-img.img-missing { position: relative; }
.img-ph-box {
  display: flex; align-items: center; justify-content: center;
  height: 320px; color: var(--muted);
  font-family: var(--font-mono); font-size: 13px;
}

/* 网格布局 */
.grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin: 18px 0; }

/* 内联 SVG 图标（替代 emoji） */
.icon-inline {
  display: inline-block;
  vertical-align: -2px;
  margin: 0 2px;
}
.callout-title .icon-inline { margin-right: 6px; }

/* ===== 代码块容器（code-frame）===== */
.code-frame {
  margin: 20px 0;
  border: 1px solid var(--rule);
  border-radius: 10px;
  background: #0C150F;
  overflow: hidden;
}
.code-frame .cb-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  background: rgba(61,220,132,0.05);
  border-bottom: 1px solid var(--rule);
}
.code-frame .cb-lang {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.15em;
  color: var(--accent);
  background: rgba(61,220,132,0.12);
  padding: 2px 8px;
  border-radius: 4px;
}
.code-frame .cb-cap {
  flex: 1;
  font-size: 12px;
  color: var(--muted);
  font-family: var(--font-mono);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.code-frame .cb-copy {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 3px 10px;
  cursor: pointer;
  transition: all .15s;
}
.code-frame .cb-copy:hover { color: var(--accent); border-color: var(--accent-dim); }
.code-frame pre {
  margin: 0;
  padding: 16px 18px;
  overflow-x: auto;
  background: transparent;
  border: none;
}
.code-frame pre code {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  color: #C9E8D4;
  white-space: pre-wrap;
  word-break: break-word;
  overflow-wrap: anywhere;
  background: transparent;
  padding: 0;
}
.code-frame pre { max-width: 100%; }
.grid .col { min-width: 0; }
@media (max-width: 700px) { .grid { grid-template-columns: 1fr; } }

/* ===== 全局防溢出：正文/表格/列表长文本断行 ===== */
.chapter-content {
  overflow-x: hidden;
}
.chapter-content p,
.chapter-content li,
.chapter-content td,
.chapter-content th,
.chapter-content blockquote,
.chapter-content .callout {
  overflow-wrap: anywhere;
  word-break: break-word;
}
.chapter-content table { table-layout: auto; width: 100%; }
.chapter-content .table-wrap { overflow-x: auto; max-width: 100%; }
.chapter-content img { max-width: 100%; height: auto; }
.chapter-content section { max-width: 100%; }

/* ---------- 指南卡片（使用说明页沿用） ---------- */
.guide-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin: 24px 0;
}

.guide-card {
  background: var(--bg-card);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 22px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.guide-card:hover {
  border-color: var(--accent-dim);
  transform: translateY(-3px);
}

.guide-card .icon {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--accent);
  display: block;
  margin-bottom: 10px;
}

.guide-card h4 {
  font-family: var(--font-display);
  font-size: 17px;
  color: var(--ink);
  margin-bottom: 8px;
}

.guide-card p { font-size: 14px; color: var(--ink-dim); margin: 0; }

/* ---------- 上一章 / 下一章 ---------- */
.pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 72px;
  padding-top: 32px;
  border-top: 1px solid var(--rule);
}

.pager a {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 18px 22px;
  transition: border-color 0.2s ease;
}

.pager a:hover { border-color: var(--accent); }

.pager .pager-dir {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--muted);
  display: block;
  margin-bottom: 6px;
}

.pager .pager-title {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.pager a:hover .pager-title { color: var(--accent); }
.pager .next { text-align: right; }

/* ---------- 章节页脚 ---------- */
.site-footer {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 32px 48px 48px;
  border-top: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--accent); }

/* ============================================================
   首页 Landing
   ============================================================ */

.landing { position: relative; z-index: 1; }

/* 顶部导航条 */
.land-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  height: 64px;
  background: rgba(10, 18, 13, 0.82);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--rule);
}

.land-nav .brand {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  color: var(--ink);
  letter-spacing: 0.04em;
}

.land-nav .brand em { color: var(--accent); font-style: normal; }

.land-nav .brand .ver {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 0.2em;
  margin-left: 10px;
  vertical-align: middle;
}

.land-nav ul { list-style: none; display: flex; gap: 6px; }

.land-nav ul a {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--ink-dim);
  padding: 8px 14px;
  border-radius: 6px;
  transition: all 0.18s ease;
}

.land-nav ul a:hover { color: var(--accent); background: rgba(61, 220, 132, 0.08); }

.land-nav .cta {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: #07110A !important;
  background: var(--accent);
  padding: 9px 18px !important;
  border-radius: 7px;
  font-weight: 700;
}

.land-nav .cta:hover { background: var(--accent-soft); }

/* Hero */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 120px 40px 60px;
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
}

.hero .hero-kicker {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.3em;
  color: var(--accent);
  margin-bottom: 28px;
  display: flex;
  align-items: center;
  gap: 14px;
}

.hero .hero-kicker::before {
  content: "";
  width: 44px; height: 1px;
  background: var(--accent);
}

.hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--ink);
  margin-bottom: 0;
  line-height: 0.92;
  display: flex;
  flex-direction: column;
  font-size: clamp(84px, 16vw, 210px);
}
/* TRAE 与 绿皮书：字号放大，适当增加间距 */
.hero h1 .stroke,
.hero h1 .solid { display: block; line-height: 0.92; }

.hero h1 .stroke {
  color: transparent;
  -webkit-text-stroke: 1.5px var(--accent);
}
/* 绿皮书跟随 TRAE 的字号比例缩小一点，保持层级 */
.hero h1 .solid {
  color: var(--accent);
  font-size: clamp(64px, 10.5vw, 132px);
  margin-top: 0.18em;   /* 增加与 TRAE 的间距 */
}

/* grid-distortion：鼠标扭曲回弹画布 */
.hero h1 .stroke.trae-gl {
  -webkit-text-stroke: 0;
  cursor: crosshair;
}
.hero h1 .stroke.trae-gl canvas {
  display: block;
  width: 100%;
}

.hero-main { position: relative; z-index: 1; }

/* 标题行：TRAE/绿皮书 左，终端框右，底部对齐（代码框与绿皮书同行） */
.hero-title-row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
}
.hero-title-row h1 { flex: 0 1 auto; }

/* hero 下部：说明左、按钮右，底部对齐 */
.hero-bottom {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
  margin-top: 36px;
}

.hero .hero-sub {
  font-size: clamp(16px, 2vw, 20px);
  color: var(--ink-dim);
  max-width: 520px;
  margin: 0;
  line-height: 1.8;
  flex: 1 1 340px;
}

.hero .hero-sub strong { color: var(--ink); }

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  align-items: center;
  flex-shrink: 0;
}

.btn-primary {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: #07110A;
  background: var(--accent);
  padding: 16px 34px;
  border-radius: 8px;
  transition: all 0.2s ease;
  display: inline-block;
}

.btn-primary:hover { background: var(--accent-soft); transform: translateY(-2px); color: #07110A; }

.btn-ghost {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.12em;
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  padding: 16px 34px;
  border-radius: 8px;
  transition: all 0.2s ease;
  display: inline-block;
}

.btn-ghost:hover { border-color: var(--accent); background: rgba(61, 220, 132, 0.07); }

/* Hero 右下角装饰终端框 */
.hero-term {
  flex-shrink: 0;
  width: 400px;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: rgba(7, 16, 10, 0.85);
  backdrop-filter: blur(8px);
  padding: 20px 24px;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.9;
  color: var(--ink-dim);
  display: none;
  z-index: 2;
}

.hero-term .t-line .p { color: var(--accent); }
.hero-term .t-cursor { display: inline-block; width: 8px; height: 14px; background: var(--accent); vertical-align: -2px; animation: blink 1.1s steps(2) infinite; }

@keyframes blink { 50% { opacity: 0; } }

@media (min-width: 1100px) { .hero-term { display: block; } }

/* 数据条 */
.stats-band {
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  background: rgba(15, 27, 19, 0.6);
}

.stats-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.stat-cell {
  padding: 34px 30px;
  border-left: 1px solid var(--rule);
}

.stat-cell:first-child { border-left: none; }

.stat-cell .num {
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 8px;
}

.stat-cell .num small { font-size: 18px; color: var(--accent-soft); }

.stat-cell .lbl {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--muted);
}

/* 通用区块 */
.section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 110px 40px 40px;
}

.section .sec-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--accent);
  margin-bottom: 16px;
  display: block;
}

.section h2 {
  font-family: var(--font-display);
  font-size: clamp(30px, 4.5vw, 48px);
  font-weight: 800;
  color: var(--ink);
  line-height: 1.15;
  margin-bottom: 18px;
}

.section .sec-lede {
  color: var(--ink-dim);
  max-width: 620px;
  font-size: 16.5px;
  margin-bottom: 52px;
}

/* 分篇卡片 */
.parts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.part-card {
  position: relative;
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--rule);
  border-radius: 14px;
  padding: 34px 32px 30px;
  overflow: hidden;
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.part-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(500px 200px at 100% 0%, rgba(61, 220, 132, 0.09), transparent 60%);
  opacity: 0;
  transition: opacity 0.25s ease;
  pointer-events: none;
}

.part-card:hover { border-color: var(--accent-dim); transform: translateY(-4px); }
.part-card:hover::after { opacity: 1; }

.part-card .p-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--accent);
  margin-bottom: 14px;
  display: block;
}

.part-card h3 {
  font-family: var(--font-display);
  font-size: 23px;
  font-weight: 800;
  color: var(--ink);
  line-height: 1.3;
  margin-bottom: 12px;
}

.part-card p { color: var(--ink-dim); font-size: 14.5px; margin-bottom: 22px; }

.part-card .p-meta { display: flex; gap: 10px; flex-wrap: wrap; }

.part-card .chip {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--accent-soft);
  border: 1px solid var(--accent-dim);
  border-radius: 100px;
  padding: 5px 13px;
}

.part-card .arrow {
  position: absolute;
  right: 28px; top: 32px;
  font-family: var(--font-mono);
  color: var(--muted);
  font-size: 18px;
  transition: all 0.2s ease;
}

.part-card:hover .arrow { color: var(--accent); transform: translate(3px, -3px); }

/* 任务入口 */
.task-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.task-cell {
  display: block;
  border: 1px solid var(--rule);
  border-radius: 12px;
  padding: 26px 24px;
  background: var(--bg-raised);
  transition: all 0.22s ease;
}

.task-cell:hover { border-color: var(--accent); background: var(--bg-card); }

.task-cell .t-ico {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  letter-spacing: 0.16em;
  display: block;
  margin-bottom: 12px;
}

.task-cell h4 {
  font-family: var(--font-display);
  font-size: 17.5px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 6px;
}

.task-cell span { font-size: 13.5px; color: var(--muted); }

/* 理念四步 */
.philo-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--rule);
  border-radius: 14px;
  overflow: hidden;
  background: var(--bg-card);
}

.philo-step {
  padding: 36px 28px 32px;
  border-left: 1px solid var(--rule);
  position: relative;
}

.philo-step:first-child { border-left: none; }

.philo-step .step-no {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  color: transparent;
  -webkit-text-stroke: 1px var(--accent-dim);
  display: block;
  margin-bottom: 16px;
}

.philo-step h4 {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.18em;
  color: var(--accent);
  margin-bottom: 10px;
}

.philo-step p { font-size: 14px; color: var(--ink-dim); margin: 0; }

/* 页脚 CTA */
.final-cta {
  max-width: 1200px;
  margin: 0 auto;
  padding: 100px 40px 110px;
  text-align: center;
}

.final-cta .sec-kicker { justify-content: center; display: block; }

.final-cta h2 {
  font-family: var(--font-display);
  font-size: clamp(32px, 5vw, 54px);
  font-weight: 800;
  color: var(--ink);
  margin-bottom: 20px;
}

.final-cta p { color: var(--ink-dim); max-width: 520px; margin: 0 auto 40px; }

.land-footer {
  border-top: 1px solid var(--rule);
  padding: 28px 40px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  max-width: 1200px;
  margin: 0 auto;
}

/* 入场动画 */
.rise { opacity: 0; transform: translateY(26px); animation: rise 0.9s cubic-bezier(0.22, 1, 0.36, 1) forwards; }
.d1 { animation-delay: 0.08s; } .d2 { animation-delay: 0.18s; } .d3 { animation-delay: 0.3s; }
.d4 { animation-delay: 0.42s; } .d5 { animation-delay: 0.54s; }

@keyframes rise { to { opacity: 1; transform: none; } }

/* ============================================================
   响应式
   ============================================================ */

@media (max-width: 1024px) {
  .site-nav { transform: translateX(-100%); transition: transform 0.28s ease; }
  .site-nav.open { transform: none; box-shadow: 30px 0 80px rgba(0,0,0,0.5); }
  .topbar { display: flex; }
  .chapter-body { margin-left: 0; }
  .chapter-content { padding: 96px 28px 64px; }
  .site-footer { padding: 28px; }
}

@media (max-width: 900px) {
  .parts-grid { grid-template-columns: 1fr; }
  .task-grid { grid-template-columns: repeat(2, 1fr); }
  .philo-steps { grid-template-columns: repeat(2, 1fr); }
  .philo-step:nth-child(3) { border-left: none; }
  .philo-step:nth-child(n+3) { border-top: 1px solid var(--rule); }
  .stats-inner { grid-template-columns: repeat(2, 1fr); }
  .stat-cell:nth-child(3) { border-left: none; }
  .stat-cell:nth-child(n+3) { border-top: 1px solid var(--rule); }
  .land-nav ul li:not(.keep) { display: none; }
}

@media (max-width: 600px) {
  .task-grid { grid-template-columns: 1fr; }
  .philo-steps { grid-template-columns: 1fr; }
  .philo-step { border-left: none; border-top: 1px solid var(--rule); }
  .philo-step:first-child { border-top: none; }
  .hero { padding: 100px 24px 48px; }
  .section { padding: 72px 24px 24px; }
  .land-nav { padding: 0 20px; }
  .pager { grid-template-columns: 1fr; }
  .chapter-content { padding: 92px 20px 56px; }
}

/* ============================================================
   管理员图片上传功能
   仅 ADMIN 角色可见，叠加在 doc-img 图片容器上
   ============================================================ */

/* 上传按钮：+号小圆圈，悬浮在图片右上角 */
.gb-upload-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  z-index: 10;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1.5px solid rgba(61, 220, 132, 0.5);
  background: rgba(10, 18, 13, 0.85);
  color: var(--accent);
  font-size: 18px;
  font-weight: 300;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  backdrop-filter: blur(4px);
  opacity: 0;
  pointer-events: none;
}
/* doc-img 需要 relative 才能定位按钮 */
.doc-img { position: relative; }
/* 悬停时显示按钮 */
.doc-img:hover .gb-upload-btn {
  opacity: 1;
  pointer-events: auto;
}
.gb-upload-btn:hover {
  background: rgba(61, 220, 132, 0.2);
  border-color: var(--accent);
  transform: scale(1.1);
}
.gb-upload-btn:active {
  transform: scale(0.95);
}

/* 上传中状态 */
.gb-upload-btn.uploading {
  opacity: 1;
  pointer-events: auto;
  animation: gb-spin 0.8s linear infinite;
  color: var(--amber);
  border-color: rgba(242, 184, 75, 0.5);
}
@keyframes gb-spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* 上传成功闪一下绿 */
.gb-upload-btn.success {
  opacity: 1;
  pointer-events: auto;
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(61, 220, 132, 0.3);
  animation: gb-pulse 0.6s ease;
}
@keyframes gb-pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.2); }
}

/* 隐藏的文件输入 */
.gb-file-input {
  display: none;
}

/* 登录后按钮高亮态 */
.gb-login-trigger.gb-logged-in {
  border-color: var(--accent);
  color: var(--accent);
}

/* 登录按钮（行内，footer 版权区域内） */
.gb-login-trigger {
  background: transparent;
  border: 1px solid var(--rule);
  color: var(--muted);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 10px;
  font-family: var(--font-mono);
  cursor: pointer;
  transition: all 0.2s;
  letter-spacing: 0.06em;
  vertical-align: middle;
  margin-right: 6px;
}
.gb-login-trigger:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Toast 提示 */
.gb-toast {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(-20px);
  z-index: 10000;
  padding: 10px 24px;
  border-radius: 6px;
  font-size: 13px;
  font-family: var(--font-mono);
  opacity: 0;
  transition: all 0.3s ease;
  pointer-events: none;
  white-space: nowrap;
}
.gb-toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}
.gb-toast.info {
  background: rgba(30, 40, 30, 0.95);
  color: var(--ink-dim);
  border: 1px solid var(--rule);
}
.gb-toast.success {
  background: rgba(30, 80, 30, 0.95);
  color: #5dbd5d;
  border: 1px solid rgba(93, 189, 93, 0.3);
}
.gb-toast.error {
  background: rgba(80, 30, 30, 0.95);
  color: #e85d5d;
  border: 1px solid rgba(232, 93, 93, 0.3);
}

/* 移动端适配 */
@media (max-width: 600px) {
  .gb-upload-btn {
    width: 24px;
    height: 24px;
    font-size: 16px;
    top: 4px;
    right: 4px;
  }
}

/* 打印 */
@media print {
  body { background: #fff; color: #111; }
  body::before, .site-nav, .topbar, .pager, .land-nav { display: none !important; }
  .chapter-body { margin: 0; }
  .chapter-content { max-width: none; padding: 0; }
  .chapter-content h2, .chapter-content h3, .chapter-content p, .chapter-content li, .chapter-content td { color: #222; }
  .code-block { background: #f4f4f4; border-color: #ddd; }
  .code-block pre { color: #222; }
  .gb-upload-btn, .gb-login-trigger { display: none !important; }
}