:root {
  --bg: #eae4d6;
  --bg-2: #faf7ef;
  --bg-3: #dfd9c8;
  --ink: #1c211e;
  --ink-dim: #565e59;
  --ink-faint: #989e99;
  --accent: #d8f238;
  --accent-deep: #5f7d00;
  --orange: #e85f2a;
  --line: #e5e2d7;
  --line-2: #d5d2c6;
  --serif: "Songti SC", "Noto Serif SC", "Source Han Serif SC", Georgia, serif;
  --sans: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, "JetBrains Mono", "SF Mono", Menlo, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background:
    radial-gradient(900px 400px at 12% -4%, rgba(216, 242, 56, 0.10), transparent 60%),
    radial-gradient(800px 400px at 100% 0%, rgba(232, 95, 42, 0.06), transparent 55%),
    var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent-deep); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ===== 顶部品牌栏 ===== */
.site-head {
  position: sticky; top: 0; z-index: 50;
  background: rgba(234, 228, 214, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.head-inner {
  max-width: 1120px; margin: 0 auto;
  display: flex; align-items: center; gap: 28px;
  padding: 14px 24px;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand:hover { text-decoration: none; }
.brand-mark { font-size: 22px; line-height: 1; }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text strong { font-size: 17px; font-family: var(--serif); letter-spacing: 1px; color: var(--ink); }
.brand-text em { font-style: normal; font-size: 10px; color: var(--ink-faint); font-family: var(--mono); letter-spacing: 2px; text-transform: uppercase; }
.head-nav { display: flex; gap: 20px; margin-left: auto; }
.head-nav a { color: var(--ink-dim); font-size: 14px; padding: 4px 0; border-bottom: 2px solid transparent; }
.head-nav a:hover { color: var(--ink); text-decoration: none; }
.head-nav a.on { color: var(--accent-deep); border-bottom-color: var(--accent); font-weight: 600; }
.head-social { display: flex; gap: 8px; }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 8px 16px; border-radius: 6px; font-size: 14px; font-weight: 600;
  border: 1px solid transparent; cursor: pointer; transition: all .15s;
}
.btn:hover { text-decoration: none; }
.btn-lg { padding: 12px 26px; font-size: 16px; }
.btn-solid { background: var(--accent); color: var(--ink); }
.btn-solid:hover { background: #c9e600; }
.btn-ghost { border-color: var(--line-2); color: var(--ink); }
.btn-ghost:hover { border-color: var(--accent-deep); color: var(--accent-deep); }

/* ===== 主体容器 ===== */
.page { min-height: 60vh; }
.content-wrap { max-width: 900px; margin: 0 auto; padding: 24px; }

/* ===== 首页 hero ===== */
.home-hero {
  padding: 88px 0 64px;
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(234, 228, 214, 0.82) 0%, rgba(234, 228, 214, 0.55) 100%),
    url('/assets/img/hero-bg.jpg') center / cover no-repeat;
}
.hero-kicker {
  font-family: var(--mono); font-size: 12px; letter-spacing: 3px;
  color: var(--orange); text-transform: uppercase; margin-bottom: 20px;
}
.home-hero h1 {
  font-family: var(--serif); font-size: 46px; line-height: 1.25; margin: 0 0 20px;
  font-weight: 900; letter-spacing: 1px; color: var(--ink);
}
.home-hero h1 em { font-style: normal; color: var(--orange); }
.hero-sub { color: var(--ink-dim); font-size: 17px; max-width: 560px; margin: 0 0 32px; }
.hero-cta { display: flex; gap: 12px; margin-bottom: 40px; }
.hero-stats { display: flex; gap: 40px; }
.stat { display: flex; align-items: baseline; gap: 8px; }
.stat b { font-family: var(--mono); font-size: 34px; color: var(--accent-deep); font-weight: 700; }
.stat span { color: var(--ink-faint); font-size: 14px; }

/* ===== 分卷 + 章节卡片 ===== */
.part { margin: 48px 0; }
.part-head { margin-bottom: 20px; }
.part-eyebrow {
  font-family: var(--mono); font-size: 11px; letter-spacing: 2px;
  color: var(--orange); text-transform: uppercase;
}
.part-head h2 {
  font-family: var(--serif); font-size: 24px; margin: 6px 0 0; font-weight: 700; color: var(--ink);
}
.ch-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.ch-card {
  display: block; padding: 20px; border: 1px solid var(--line);
  border-radius: 10px; background: var(--bg-2); transition: all .18s;
  box-shadow: 0 1px 2px rgba(28, 33, 30, 0.03);
}
.ch-card:hover {
  text-decoration: none; border-color: var(--accent-deep);
  transform: translateY(-3px); box-shadow: 0 8px 24px rgba(28, 33, 30, 0.08);
}
.ch-card-no { font-family: var(--mono); font-size: 12px; color: var(--accent-deep); }
.ch-card h3 { margin: 8px 0 6px; font-size: 17px; color: var(--ink); font-family: var(--serif); }
.ch-card p { margin: 0; font-size: 13px; color: var(--ink-faint); }

/* ===== 指南卡片 ===== */
.notes-section { margin-top: 56px; padding-top: 24px; border-top: 1px solid var(--line); }
.note-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.note-card {
  display: block; padding: 16px 18px; border: 1px solid var(--line);
  border-radius: 8px; background: var(--bg-2); transition: all .15s;
}
.note-card:hover { text-decoration: none; border-color: var(--orange); }
.note-card h4 { margin: 0; font-size: 15px; color: var(--ink); font-weight: 600; }

/* ===== 章节页 / 指南页 ===== */
.crumbs { font-size: 13px; color: var(--ink-faint); margin-bottom: 28px; }
.crumbs a { color: var(--ink-dim); }
.crumbs span { margin: 0 6px; color: var(--line-2); }
.crumbs b { color: var(--accent-deep); font-weight: 500; }
.chapter-hero { margin-bottom: 32px; padding-bottom: 24px; border-bottom: 1px solid var(--line); }
.ch-no {
  font-family: var(--mono); font-size: 12px; letter-spacing: 3px;
  color: var(--orange); text-transform: uppercase; margin-bottom: 12px;
}
.chapter-hero h1 { font-family: var(--serif); font-size: 34px; margin: 0 0 10px; font-weight: 900; line-height: 1.3; color: var(--ink); }
.ch-sub { color: var(--ink-dim); font-size: 15px; margin: 0; }

/* ===== 正文排版 ===== */
.prose { font-size: 16px; color: var(--ink); }
.prose h2 {
  font-family: var(--serif); font-size: 22px; margin: 40px 0 16px;
  color: var(--ink); border-left: 3px solid var(--accent); padding-left: 14px;
}
.prose h3 { font-size: 18px; margin: 28px 0 12px; font-weight: 700; color: var(--ink); }
.prose h4 { font-size: 16px; margin: 22px 0 8px; color: var(--orange); }
.prose p { margin: 12px 0; }
.prose strong { color: var(--ink); }
.prose ul, .prose ol { padding-left: 22px; margin: 12px 0; }
.prose li { margin: 6px 0; }
.prose blockquote {
  margin: 16px 0; padding: 14px 18px; border-left: 3px solid var(--accent);
  background: var(--bg-3); border-radius: 0 8px 8px 0; color: var(--ink-dim);
}
.prose table { width: 100%; border-collapse: collapse; margin: 18px 0; font-size: 14px; }
.prose th, .prose td { border: 1px solid var(--line); padding: 10px 14px; text-align: left; }
.prose th { background: var(--bg-3); color: var(--accent-deep); font-weight: 600; }
.prose code { background: var(--bg-3); padding: 2px 6px; border-radius: 4px; font-family: var(--mono); font-size: 13px; color: var(--ink); }
.prose a { border-bottom: 1px solid rgba(95, 125, 0, 0.35); }
.prose a:hover { border-bottom-color: var(--accent-deep); }
.prose hr { border: none; border-top: 1px solid var(--line); margin: 32px 0; }

/* ===== 章节社交按钮 ===== */
.chapter-social { display: flex; gap: 12px; margin: 36px 0; }

/* ===== 前后章导航 ===== */
.prev-next { display: flex; justify-content: space-between; gap: 16px; margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--line); }
.pn { display: flex; flex-direction: column; max-width: 48%; padding: 16px 18px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg-2); }
.pn:hover { text-decoration: none; border-color: var(--accent-deep); }
.pn span { font-size: 12px; color: var(--ink-faint); }
.pn b { font-size: 15px; color: var(--ink); margin-top: 4px; }
.pn.next { text-align: right; align-items: flex-end; }

/* ===== 页脚 ===== */
.site-foot { margin-top: 72px; border-top: 1px solid var(--line); background: var(--bg-2); }
.foot-inner { max-width: 1120px; margin: 0 auto; padding: 40px 24px; }
.foot-brand { display: flex; align-items: center; gap: 10px; color: var(--ink-dim); font-size: 14px; margin-bottom: 20px; }
.foot-brand strong { color: var(--ink); font-family: var(--serif); }
.foot-links { display: flex; gap: 20px; flex-wrap: wrap; font-size: 14px; margin-bottom: 16px; }
.foot-links a { color: var(--ink-dim); }
.foot-links a:hover { color: var(--accent-deep); }
.foot-copy { font-size: 12px; color: var(--ink-faint); margin: 0; }

/* ===== 响应式 ===== */
@media (max-width: 800px) {
  .home-hero h1 { font-size: 32px; }
  .ch-grid { grid-template-columns: repeat(2, 1fr); }
  .note-grid { grid-template-columns: 1fr; }
  .head-nav { display: none; }
}
@media (max-width: 520px) {
  .ch-grid { grid-template-columns: 1fr; }
  .home-hero h1 { font-size: 26px; }
  .chapter-hero h1 { font-size: 26px; }
  .hero-stats { gap: 24px; }
  .stat b { font-size: 26px; }
}