:root {
  --paper: #f4ecd9;
  --paper-2: #efe4cc;
  --ink: #1e1914;
  --ink-soft: #5c5348;
  --line: #d7c7a8;
  --rule: rgba(70, 110, 170, 0.13);
  --margin: #c45c5c;
  --accent: #0f6e68;
  --accent-2: #b45309;
  --card: #fffaf0;
  --shadow: 0 12px 40px rgba(70, 52, 20, 0.08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  background:
    radial-gradient(1200px 500px at 10% -10%, #fbf6ea 0%, transparent 55%),
    var(--paper);
  line-height: 1.7;
}

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

.wrap { width: min(1080px, calc(100% - 40px)); margin: 0 auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(244, 236, 217, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 72px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: inherit;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.04em;
}
.logo:hover { text-decoration: none; }
.mark {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--accent);
  color: #f7f4ea;
  display: grid;
  place-items: center;
  font-family: "Times New Roman", "Songti SC", serif;
  font-size: 18px;
}
.logo strong { font-size: 18px; white-space: nowrap; }
.logo span { color: var(--ink-soft); font-weight: 500; margin-left: 2px; }
nav { display: flex; gap: 22px; }
nav a { color: var(--ink-soft); font-weight: 600; }
nav a[aria-current="page"], nav a:hover { color: var(--ink); text-decoration: none; }

.hero { padding: 64px 0 28px; }
.eyebrow {
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.18em;
  font-size: 12px;
  text-transform: uppercase;
}
.hero h1 {
  font-family: "Songti SC", "Noto Serif SC", "STSong", serif;
  font-size: clamp(40px, 7vw, 72px);
  line-height: 1.15;
  margin: 10px 0 16px;
  font-weight: 700;
}
.lede { max-width: 640px; font-size: 18px; color: var(--ink-soft); }
.hero-meta { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 22px; }
.chip {
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 13px;
  color: var(--ink-soft);
}

.section { padding: 18px 0 56px; }
.section h2 {
  font-size: 22px;
  margin: 0 0 18px;
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.section h2 small { color: var(--ink-soft); font-weight: 500; font-size: 13px; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 18px;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px 20px 18px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  min-height: 210px;
  color: inherit;
  text-decoration: none;
  transition: transform .18s ease, box-shadow .18s ease;
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 36px rgba(70, 52, 20, 0.12);
  text-decoration: none;
}
.no { color: var(--accent-2); font-weight: 700; font-size: 12px; letter-spacing: 0.08em; }
.card h3 { margin: 8px 0 10px; font-size: 20px; line-height: 1.35; }
.card p { margin: 0; color: var(--ink-soft); flex: 1; }
.card .more { margin-top: 16px; color: var(--accent); font-weight: 700; font-size: 14px; }

.note-page {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
  margin: 28px 0 64px;
  display: grid;
  grid-template-columns: 56px 1fr;
  overflow: hidden;
}
.spine {
  background:
    radial-gradient(circle at 50% 28px, #efe4cc 7px, transparent 8px),
    radial-gradient(circle at 50% 76px, #efe4cc 7px, transparent 8px),
    radial-gradient(circle at 50% 124px, #efe4cc 7px, transparent 8px),
    linear-gradient(90deg, #e7d7b4, #f7f0df 70%);
  border-right: 2px solid color-mix(in srgb, var(--margin) 70%, white);
}
.note-body {
  padding: 36px 40px 48px;
  background-image: repeating-linear-gradient(
    transparent,
    transparent 31px,
    var(--rule) 31px,
    var(--rule) 32px
  );
}
.note-body h1 {
  font-family: "Songti SC", "Noto Serif SC", "STSong", serif;
  font-size: clamp(28px, 4vw, 40px);
  margin: 0 0 8px;
  line-height: 1.25;
}
.meta { color: var(--ink-soft); font-size: 14px; margin-bottom: 28px; }
.note-body h2 { font-size: 22px; margin: 32px 0 10px; }
.note-body p, .note-body li { font-size: 16px; }
.note-body ul, .note-body ol { padding-left: 1.2em; }
pre {
  background: #1e1914;
  color: #f4ecd9;
  border-radius: 12px;
  padding: 16px 18px;
  overflow: auto;
  font-size: 13.5px;
  line-height: 1.55;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.04);
}
code { font-family: Consolas, "Sarasa Mono SC", "Courier New", monospace; }
p code, li code {
  background: #efe4cc;
  padding: 1px 6px;
  border-radius: 5px;
  font-size: 0.92em;
}
pre code { background: none; padding: 0; color: inherit; }

.toolbar {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}
.toolbar input {
  flex: 1;
  min-width: 220px;
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 10px;
  padding: 10px 12px;
  font: inherit;
}

.about-grid {
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 22px;
}
.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 24px;
  box-shadow: var(--shadow);
}
.panel h1 { margin-top: 0; font-family: "Songti SC", "Noto Serif SC", serif; }

.site-footer {
  border-top: 1px solid var(--line);
  padding: 28px 0 36px;
  color: var(--ink-soft);
  font-size: 13px;
  text-align: center;
}
.site-footer .brand-line { margin: 0 0 10px; color: var(--ink); }
.beian { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; align-items: center; }
.beian a { color: var(--ink-soft); display: inline-flex; align-items: center; gap: 6px; }
.shield { width: 16px; height: 18px; display: block; }
.copy { margin: 8px 0 0; }

.not-found { min-height: 48vh; padding: 80px 0; text-align: center; }
.not-found h1 { font-size: 64px; margin: 0; font-family: "Songti SC", serif; }

.arch {
  display: grid;
  gap: 10px;
  margin: 18px 0 8px;
  padding: 16px 18px;
  background: #efe4cc;
  border-radius: 12px;
  font-size: 14px;
}
.arch strong { color: var(--accent); }
.stage { margin: 36px 0 8px; }
.stage h2 { margin-bottom: 6px; }
.stage p { margin: 0 0 12px; color: var(--ink-soft); font-size: 15px; }
.chapters { list-style: none; padding: 0; margin: 0; }
.chapters li {
  display: grid;
  grid-template-columns: 2.4rem 1fr auto;
  gap: 10px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px dashed var(--line);
}
.chapters .n { color: var(--accent-2); font-weight: 700; font-size: 13px; }
.chapters h3 { margin: 0; font-size: 17px; font-weight: 700; }
.chapters p { margin: 4px 0 0; font-size: 14px; }
.badge {
  font-size: 12px;
  color: var(--ink-soft);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 2px 8px;
  white-space: nowrap;
}
.feature {
  display: block;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 28px 28px 24px;
  box-shadow: var(--shadow);
  color: inherit;
  text-decoration: none;
  margin-bottom: 8px;
}
.feature:hover { text-decoration: none; transform: translateY(-2px); box-shadow: 0 16px 36px rgba(70, 52, 20, 0.12); }
.feature h3 { margin: 8px 0 8px; font-size: 26px; font-family: "Songti SC", "Noto Serif SC", serif; }
.feature p { margin: 0; color: var(--ink-soft); }
.feature .more { display: inline-block; margin-top: 16px; color: var(--accent); font-weight: 700; font-size: 14px; }

@media (max-width: 720px) {
  .header-inner { flex-wrap: wrap; padding: 10px 0; }
  nav { width: 100%; gap: 14px; }
  .note-page { grid-template-columns: 18px 1fr; }
  .note-body { padding: 24px 16px 32px; }
  .about-grid { grid-template-columns: 1fr; }
}