:root {
  --bg: #ffffff;
  --text: #1f2328;
  --muted: #6b7280;
  --border: #e6e8eb;
  --accent: #e8590c;
  --accent-soft: #fff4ec;
  --code-bg: #1e2127;
  --code-text: #e6e6e6;
  --maxw: 840px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC",
    "Microsoft YaHei", "Hiragino Sans GB", "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.85;
  font-size: 16.5px;
  -webkit-font-smoothing: antialiased;
}

/* 顶部栏 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
  padding: 14px 20px;
}
.brand {
  font-weight: 700;
  font-size: 16px;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: 0.2px;
}

/* 正文容器 */
.content {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 32px 22px 60px;
}

.chapter-title {
  font-size: 27px;
  line-height: 1.35;
  margin: 8px 0 26px;
  padding-bottom: 14px;
  border-bottom: 3px solid var(--accent);
}

/* 子标题 */
h3 {
  font-size: 19px;
  margin: 34px 0 12px;
  color: #111;
}
h4 { font-size: 16.5px; margin: 22px 0 8px; }

p { margin: 14px 0; }

/* 行内代码 */
code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.88em;
  background: #f3f4f6;
  color: #c0263a;
  padding: 2px 6px;
  border-radius: 5px;
}

/* 代码块 */
pre {
  background: var(--code-bg);
  color: var(--code-text);
  padding: 16px 18px;
  border-radius: 10px;
  overflow-x: auto;
  line-height: 1.6;
  font-size: 14px;
  margin: 18px 0;
}
pre code {
  background: none;
  color: inherit;
  padding: 0;
  font-size: inherit;
}

/* 链接 */
a { color: var(--accent); }

/* 表格 */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0;
  font-size: 15px;
}
th, td {
  border: 1px solid var(--border);
  padding: 9px 12px;
  text-align: left;
  vertical-align: top;
}
thead th {
  background: #fafafa;
  font-weight: 700;
}
tbody tr:nth-child(even) { background: #fcfcfc; }

/* 引用 / callout */
blockquote {
  margin: 18px 0;
  padding: 12px 16px;
  border-left: 4px solid var(--muted);
  background: #f7f8fa;
  border-radius: 0 8px 8px 0;
  color: #374151;
}
blockquote p { margin: 6px 0; }
.callout.experience { border-left-color: #2563eb; background: #eff6ff; }
.callout.warning    { border-left-color: #dc2626; background: #fef2f2; }
.callout.tip        { border-left-color: #16a34a; background: #f0fdf4; }
.callout.note       { border-left-color: #d97706; background: #fffbeb; }
.callout strong { color: #111; }

/* 上下页导航 */
.pager {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 24px 22px 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border-top: 1px solid var(--border);
}
.pager-side { flex: 1; }
.pager-side:last-child { text-align: right; }
.pager-link {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
}
.pager-home {
  color: var(--muted);
  text-decoration: none;
  font-weight: 600;
  padding: 0 6px;
}

.site-footer {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 22px;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

/* ===== 首页 ===== */
.hero {
  text-align: center;
  padding: 30px 10px 18px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 30px;
}
.hero-title {
  font-size: 34px;
  margin: 0 0 8px;
  color: var(--accent);
  letter-spacing: 0.5px;
}
.hero-sub {
  color: var(--muted);
  margin: 0 0 18px;
  font-style: italic;
}
.hero-meta {
  list-style: none;
  padding: 0;
  margin: 0 auto;
  max-width: 560px;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 6px 16px;
  text-align: left;
  font-size: 14.5px;
}
.hero-meta li { display: contents; }
.hero-meta .mk {
  color: var(--muted);
  font-weight: 600;
  white-space: nowrap;
}
.hero-meta .mv { color: var(--text); }

/* 目录：按 Part 分组 */
.part { margin-bottom: 34px; }
.part-name {
  font-size: 21px;
  margin: 0 0 16px;
  padding-left: 12px;
  border-left: 5px solid var(--accent);
}
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
}
.card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  border: 1px solid var(--border);
  border-radius: 12px;
  text-decoration: none;
  color: var(--text);
  background: #fff;
  transition: transform 0.12s ease, box-shadow 0.12s ease, border-color 0.12s ease;
}
.card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  box-shadow: 0 8px 22px rgba(232, 89, 12, 0.12);
}
.card-num {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.5px;
}
.card-title {
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.5;
}

@media (max-width: 600px) {
  .hero-title { font-size: 26px; }
  .chapter-title { font-size: 23px; }
  .pager { flex-direction: column; align-items: stretch; text-align: center; }
  .pager-side, .pager-side:last-child { text-align: center; }
}