/* Rust 学习文档 · 自包含样式 */
@font-face {
  font-family: "ZhuZiAWan";
  src: url("fonts/ZhuZiAWan-subset.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

:root {
  --bg: #ffffff;
  --bg-soft: #f8f8f8;
  --bg-code: #fbfbfd;
  --text: #333a4d;
  --text-soft: #5f687b;
  --text-faint: #6b7280;
  --text-strong: #111827;
  --border: #e5e7eb;
  --accent: #005fb8;
  --accent-strong: #6d28d9;
  --accent-cyan: #0e7490;
  --accent-warm: #b45309;
  --accent-soft: #e8f1fb;
  --accent-glow: rgba(0, 95, 184, 0.28);
  --selection: #dbeafe;
  --on-accent: #ffffff;
  --focus-ring: rgba(0, 95, 184, 0.16);
  --glass: rgba(255, 255, 255, 0.72);
  --glass-strong: rgba(255, 255, 255, 0.9);
  --glass-border: rgba(0, 95, 184, 0.14);
  --input-bg: rgba(255, 255, 255, 0.78);
  --ambient-1: rgba(0, 95, 184, 0.08);
  --ambient-2: rgba(109, 40, 217, 0.05);
  --grid: rgba(0, 95, 184, 0.055);
  --glow: 0 0 24px rgba(0, 95, 184, 0.10);
  --code-glow: 0 12px 32px rgba(0, 0, 0, 0.08);
  --active-bg: linear-gradient(90deg, rgba(0, 95, 184, 0.10), rgba(109, 40, 217, 0.03));
  --quote-bg: linear-gradient(135deg, rgba(0, 95, 184, 0.06), rgba(109, 40, 217, 0.02));
  --table-head: linear-gradient(180deg, rgba(0, 95, 184, 0.06), transparent);
  --shadow: 0 12px 36px rgba(0, 0, 0, 0.08);
  --sidebar-w: 300px;
  --topbar-h: 60px;
  --radius: 12px;
  --reading-text: 16px;
  --content-width: 920px;
}

[data-theme="dark"] {
  --bg: #1a1b26;
  --bg-soft: #16161e;
  --bg-code: #23272e;
  --text: #c8d3f5;
  --text-soft: #a9b1d6;
  --text-faint: #7f8bb5;
  --text-strong: #f0f3ff;
  --border: #3b4261;
  --accent: #7aa2f7;
  --accent-strong: #bb9af7;
  --accent-cyan: #7dcfff;
  --accent-warm: #e0af68;
  --accent-soft: #24283b;
  --accent-glow: rgba(122, 162, 247, 0.45);
  --selection: #3b4261;
  --on-accent: #16161e;
  --focus-ring: rgba(122, 162, 247, 0.25);
  --glass: rgba(22, 22, 30, 0.72);
  --glass-strong: rgba(22, 22, 30, 0.9);
  --glass-border: rgba(122, 162, 247, 0.16);
  --input-bg: rgba(26, 27, 38, 0.6);
  --ambient-1: rgba(122, 162, 247, 0.18);
  --ambient-2: rgba(187, 154, 247, 0.12);
  --grid: rgba(192, 202, 245, 0.035);
  --glow: 0 0 24px rgba(122, 162, 247, 0.18);
  --code-glow: 0 14px 40px rgba(0, 0, 0, 0.28);
  --active-bg: linear-gradient(90deg, rgba(122, 162, 247, 0.18), rgba(187, 154, 247, 0.06));
  --quote-bg: linear-gradient(135deg, rgba(122, 162, 247, 0.12), rgba(187, 154, 247, 0.05));
  --table-head: linear-gradient(180deg, rgba(122, 162, 247, 0.10), transparent);
  --shadow: 0 12px 36px rgba(0, 0, 0, 0.45);
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 200;
  padding: 8px 14px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: var(--on-accent);
  text-decoration: none;
  box-shadow: var(--glow);
  transform: translateY(-160%);
  transition: transform 0.15s ease;
}

.skip-link:focus { transform: translateY(0); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--topbar-h) + 18px);
  scrollbar-color: var(--border) transparent;
}

body {
  position: relative;
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(1000px 600px at 82% -8%, var(--ambient-1), transparent 62%),
    radial-gradient(800px 520px at -8% 18%, var(--ambient-2), transparent 58%),
    var(--bg);
  background-attachment: fixed;
  color: var(--text);
  font-family: "ZhuZiAWan", system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 52px 52px;
  mask-image: radial-gradient(circle at 50% 0%, #000 0%, transparent 72%);
  -webkit-mask-image: radial-gradient(circle at 50% 0%, #000 0%, transparent 72%);
  pointer-events: none;
  z-index: 0;
}

::selection {
  background: var(--selection);
  color: var(--text);
}

a { color: var(--accent); }

.progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: linear-gradient(
    90deg,
    var(--accent),
    var(--accent-cyan),
    var(--accent-strong),
    var(--accent)
  );
  background-size: 200% 100%;
  box-shadow: 0 0 14px var(--accent-glow);
  z-index: 100;
  transition: width 0.08s linear;
  animation: progress-flow 4s linear infinite;
}

@keyframes progress-flow {
  to { background-position: 200% 0; }
}

.topbar {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 18px;
  background: var(--glass);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.03), 0 10px 30px rgba(0, 0, 0, 0.10);
  z-index: 50;
}

.topbar::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    var(--accent),
    var(--accent-cyan),
    var(--accent-strong),
    transparent
  );
  opacity: 0.45;
  pointer-events: none;
}

.brand {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.01em;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.brand-text {
  background: linear-gradient(
    90deg,
    var(--text) 0%,
    var(--accent) 48%,
    var(--accent-cyan) 76%,
    var(--accent-strong) 100%
  );
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.brand .crab { font-size: 1.15em; }

.topbar-pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 10px;
  border: 1px solid var(--glass-border);
  border-radius: 999px;
  background: var(--glass);
  color: var(--text-soft);
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.13em;
  white-space: nowrap;
}

.pulse-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #9ece6a;
  box-shadow: 0 0 10px rgba(158, 206, 106, 0.8);
  animation: pulse 2.4s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.5;
    transform: scale(0.75);
  }
}

.topbar-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-btn,
.text-btn {
  border: 1px solid var(--glass-border);
  background: var(--glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--text-soft);
  border-radius: 8px;
  cursor: pointer;
  font: inherit;
  transition: color 0.15s ease, border-color 0.15s ease,
    background 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}

.icon-btn {
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

[data-theme="dark"] .theme-icon-moon { display: none; }
[data-theme="light"] .theme-icon-sun { display: none; }

.text-btn { padding: 6px 12px; font-size: 0.82rem; }

.settings-toggle {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.settings-panel {
  position: absolute;
  top: calc(100% + 10px);
  right: 18px;
  z-index: 80;
  width: 280px;
  padding: 14px;
  border: 1px solid var(--glass-border);
  border-radius: 14px;
  background: var(--glass-strong);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  box-shadow: var(--shadow), var(--glow);
}

.settings-title {
  margin-bottom: 10px;
  color: var(--accent-cyan);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: 10px 0;
}

.settings-label {
  color: var(--text-soft);
  font-size: 0.82rem;
}

.settings-options {
  display: inline-flex;
  padding: 2px;
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  background: var(--bg-soft);
}

.settings-options button {
  padding: 4px 9px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--text-soft);
  cursor: pointer;
  font: inherit;
  font-size: 0.78rem;
}

.settings-options button:hover { color: var(--accent); }

.settings-options button[aria-pressed="true"] {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 700;
}

.settings-check {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  color: var(--text-soft);
  cursor: pointer;
  font-size: 0.82rem;
}

.settings-check input { accent-color: var(--accent); }

.icon-btn:hover,
.text-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-soft);
  transform: translateY(-1px);
  box-shadow: var(--glow);
}

.menu-toggle { display: none; }

.layout {
  position: relative;
  z-index: 1;
  padding-top: var(--topbar-h);
}

.sidebar {
  position: fixed;
  top: var(--topbar-h);
  bottom: 0;
  left: 0;
  width: var(--sidebar-w);
  overflow-y: auto;
  padding: 20px 14px 36px;
  background: var(--glass);
  backdrop-filter: blur(20px) saturate(130%);
  -webkit-backdrop-filter: blur(20px) saturate(130%);
  border-right: 1px solid var(--glass-border);
  box-shadow: inset -1px 0 0 rgba(255, 255, 255, 0.02);
  z-index: 40;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.sidebar::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 240px;
  background: radial-gradient(circle at 25% 0%, var(--ambient-1), transparent 70%);
  pointer-events: none;
}

.sidebar > * {
  position: relative;
  z-index: 1;
}

.sidebar-head {
  position: relative;
  padding: 4px 10px 14px;
}

.sidebar-close {
  display: none;
  position: absolute;
  top: 0;
  right: 0;
  width: 32px;
  height: 32px;
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  background: var(--glass);
  color: var(--text-soft);
  cursor: pointer;
  font: inherit;
  font-size: 1.1rem;
  line-height: 1;
}

.sidebar-close:hover { color: var(--accent); border-color: var(--accent); }

.resume-link {
  display: block;
  margin-top: 10px;
  padding: 8px 10px;
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent-cyan);
  font-size: 0.8rem;
  line-height: 1.4;
  text-decoration: none;
}

.resume-link:hover { border-color: var(--accent); color: var(--accent); }

.sidebar-kicker {
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 700;
}

.sidebar-title {
  font-size: 1.22rem;
  font-weight: 700;
  margin-top: 4px;
}

.sidebar-meta {
  font-size: 0.78rem;
  color: var(--text-faint);
  margin-top: 2px;
}

.search-wrap {
  position: sticky;
  top: 0;
  z-index: 2;
  padding: 10px 0 8px;
  background: var(--glass-strong);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

#search {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--glass-border);
  border-radius: 10px;
  background: var(--input-bg);
  color: var(--text);
  font: inherit;
  font-size: 0.86rem;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

#search::placeholder { color: var(--text-faint); }

#search:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--focus-ring), 0 0 22px var(--accent-glow);
}

.no-result {
  padding: 10px;
  font-size: 0.8rem;
  color: var(--text-soft);
}

.search-results {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  z-index: 30;
  max-height: min(58vh, 480px);
  overflow-y: auto;
  margin-top: 6px;
  border: 1px solid var(--glass-border);
  border-radius: 10px;
  background: var(--glass-strong);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  box-shadow: var(--shadow), var(--glow);
}

.search-result {
  display: block;
  padding: 9px 11px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  text-decoration: none;
}

.search-result:last-child { border-bottom: 0; }

.search-result:hover,
.search-result.active { background: var(--accent-soft); }

.search-result-title {
  display: block;
  color: var(--accent-cyan);
  font-size: 0.82rem;
  font-weight: 600;
  line-height: 1.4;
}

.search-result-snippet {
  display: block;
  margin-top: 2px;
  color: var(--text-soft);
  font-size: 0.76rem;
  line-height: 1.45;
}

.search-result-snippet mark {
  border-radius: 3px;
  background: var(--accent-warm);
  color: var(--bg);
  padding: 0 2px;
}

.search-result-level {
  margin-right: 5px;
  color: var(--text-faint);
  font-size: 0.68rem;
  font-weight: 700;
}

.nav-group { margin-top: 14px; }

.nav-group-title {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 10px 5px;
  font-size: 0.68rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--text-faint);
  font-weight: 700;
}

.nav-group-title::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--border), transparent);
}

.nav-link {
  display: block;
  padding: 7px 10px;
  border-radius: 8px;
  color: var(--text-soft);
  text-decoration: none;
  font-size: 0.86rem;
  line-height: 1.45;
  scroll-margin-top: 60px;
  transition: background 0.15s ease, color 0.15s ease, transform 0.15s ease,
    box-shadow 0.15s ease;
}

.nav-link:hover {
  background: var(--accent-soft);
  color: var(--accent);
  transform: translateX(2px);
}

.nav-link.active {
  background: var(--active-bg);
  color: var(--accent);
  font-weight: 700;
  box-shadow: inset 2px 0 0 var(--accent), 0 0 18px var(--accent-glow);
}

.nav-item { position: relative; }

.nav-item > .nav-link { padding-right: 30px; }

.nav-expand {
  position: absolute;
  top: 6px;
  right: 2px;
  width: 24px;
  height: 24px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--text-faint);
  cursor: pointer;
  font: inherit;
  font-size: 1rem;
  line-height: 1;
  opacity: 0.65;
}

.nav-expand:hover,
.nav-expand:focus-visible { color: var(--accent); opacity: 1; }

.nav-sub {
  display: none;
  margin: 2px 0 8px 10px;
  padding-left: 8px;
  border-left: 1px solid var(--border);
}

.nav-item.open .nav-sub { display: block; }

.nav-sub-link {
  display: block;
  padding: 4px 8px;
  border-radius: 6px;
  color: var(--text-soft);
  font-size: 0.78rem;
  line-height: 1.4;
  text-decoration: none;
}

.nav-sub-link:hover,
.nav-sub-link.active {
  background: var(--accent-soft);
  color: var(--accent-cyan);
}

.sidebar-foot {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 28px 10px 0;
  font-size: 0.72rem;
  color: var(--text-faint);
}

.sidebar-foot a { color: var(--text-faint); }
.sidebar-foot a:hover { color: var(--accent); }

.overlay {
  display: none;
  position: fixed;
  inset: var(--topbar-h) 0 0 0;
  background: rgba(0, 0, 0, 0.45);
  z-index: 35;
}

.content { margin-left: var(--sidebar-w); min-width: 0; }

article {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 48px 56px 96px;
}

article h1 {
  font-size: clamp(2rem, 3.2vw, 2.75rem);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.01em;
  margin: 0 0 0.55em;
  color: var(--text);
}

@supports ((-webkit-background-clip: text) or (background-clip: text)) {
  article h1 {
    background: linear-gradient(
      120deg,
      var(--text) 0%,
      var(--accent) 38%,
      var(--accent-cyan) 68%,
      var(--accent-strong) 100%
    );
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
  }
}

article h1::before {
  content: "RUST NOTES · EDITION 2024";
  display: block;
  margin-bottom: 0.65em;
  font-size: 0.66rem;
  letter-spacing: 0.24em;
  font-weight: 700;
  color: var(--accent-cyan);
  -webkit-text-fill-color: var(--accent-cyan);
}

article h2 {
  position: relative;
  font-size: 1.62rem;
  font-weight: 700;
  color: var(--accent-cyan);
  line-height: 1.35;
  margin: 2.2em 0 0.8em;
  padding-bottom: 0.35em;
  border-bottom: 1px solid var(--border);
  scroll-margin-top: calc(var(--topbar-h) + 18px);
}

article h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 72px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-cyan), var(--accent-strong));
  box-shadow: 0 0 12px var(--accent-glow);
}

article h3 {
  font-size: 1.2rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--accent-strong);
  margin: 1.8em 0 0.6em;
  scroll-margin-top: calc(var(--topbar-h) + 18px);
}

article h3::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 0.85em;
  margin-right: 0.5em;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--accent-cyan), var(--accent-strong));
  box-shadow: 0 0 8px var(--accent-glow);
  vertical-align: -0.06em;
}

article p,
article li {
  font-size: var(--reading-text);
  line-height: 1.8;
}

article strong,
article b { color: var(--text-strong); }

article ul,
article ol { padding-left: 1.5em; }

article li { margin: 0.28em 0; }

article ul > li::marker { color: var(--accent-strong); }
article ol > li::marker { color: var(--accent-cyan); }

article hr {
  border: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    var(--accent-cyan),
    var(--accent-strong),
    transparent
  );
  opacity: 0.45;
  margin: 2.6em 0;
}

article a {
  text-underline-offset: 3px;
  text-decoration-color: var(--accent-glow);
}

article a:hover { color: var(--accent-strong); }

article h1 code,
article h2 code,
article h3 code {
  color: inherit;
  background: transparent;
  border: 0;
  padding: 0;
}

.header-anchor {
  margin-left: 0.35em;
  color: var(--text-soft);
  text-decoration: none;
  opacity: 0;
  font-weight: 400;
  transition: opacity 0.15s ease;
}

h2:hover .header-anchor,
h3:hover .header-anchor,
h2:focus-within .header-anchor,
h3:focus-within .header-anchor { opacity: 1; }

@media (hover: none) {
  .header-anchor { opacity: 0.35; }
}

details.quiz {
  margin: 1.1em 0;
  padding: 10px 14px;
  border: 1px solid var(--glass-border);
  border-radius: 10px;
  background: var(--bg-soft);
}

details.quiz summary {
  color: var(--accent-cyan);
  cursor: pointer;
  font-weight: 600;
}

details.quiz summary:hover { color: var(--accent); }

details.quiz p {
  margin: 0.65em 0 0;
  color: var(--text-soft);
}

article details:not(.quiz) {
  margin: 1em 0;
  padding: 8px 12px;
  border: 1px solid var(--glass-border);
  border-radius: 10px;
  background: var(--bg-soft);
}

article details:not(.quiz) summary {
  color: var(--accent-warm);
  cursor: pointer;
  font-weight: 600;
}

article details:not(.quiz)[open] summary { margin-bottom: 0.55em; }

blockquote {
  position: relative;
  margin: 1.5em 0;
  padding: 14px 20px;
  border-left: 2px solid var(--accent-strong);
  border-radius: 0 10px 10px 0;
  background: var(--quote-bg);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.03), var(--glow);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

article > blockquote:first-of-type {
  border: 1px solid var(--glass-border);
  border-left: 1px solid var(--glass-border);
  border-radius: 14px;
  padding: 16px 20px;
  background: var(--quote-bg), var(--glass);
  box-shadow: var(--glow), inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

blockquote p {
  color: var(--text-soft);
  margin: 0.3em 0;
}

:not(pre) > code {
  padding: 0.12em 0.36em;
  border: 1px solid var(--glass-border);
  border-radius: 5px;
  background: var(--bg-soft);
  color: var(--accent-warm);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.02);
  font-family: "Hack Nerd Font", "Hack Nerd Font Mono", "JetBrains Mono",
    "Fira Code", "Sarasa Mono SC", "Noto Sans Mono CJK SC",
    "Source Han Mono SC", "SFMono-Regular", Consolas, "Liberation Mono",
    monospace;
  font-size: 0.88em;
}

.code-block {
  position: relative;
  margin: 1.4em 0;
  border: 1px solid transparent;
  border-radius: var(--radius);
  overflow: hidden;
  background: linear-gradient(var(--bg-code), var(--bg-code)) padding-box,
    linear-gradient(
        135deg,
        var(--accent),
        rgba(187, 154, 247, 0.45),
        var(--border)
      )
      border-box;
  box-shadow: var(--code-glow);
  transition: box-shadow 0.22s ease, transform 0.22s ease;
}

.code-block:hover {
  box-shadow: var(--code-glow), 0 0 0 1px var(--glass-border),
    0 0 28px var(--accent-glow);
}

.code-head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-bottom: 1px solid var(--glass-border);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent),
    var(--bg-soft);
}

.code-dot {
  flex: none;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
  animation: pulse 3s ease-in-out infinite;
}

.code-lang {
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-faint);
  font-weight: 700;
}

.copy-btn {
  margin-left: auto;
  border: 1px solid var(--glass-border);
  background: var(--glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: var(--text-soft);
  border-radius: 6px;
  padding: 3px 9px;
  font: inherit;
  font-size: 0.72rem;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease,
    background 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}

.copy-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-soft);
  transform: translateY(-1px);
  box-shadow: var(--glow);
}

.copy-btn.copied {
  color: #9ece6a;
  border-color: rgba(158, 206, 106, 0.6);
}

.code-block .highlight { margin: 0; }

.code-block pre {
  margin: 0;
  padding: 14px 16px;
  overflow-x: auto;
  font-size: 0.9rem;
  line-height: 1.7;
  scrollbar-width: thin;
}

.code-block code {
  font-family: "Hack Nerd Font", "Hack Nerd Font Mono", "JetBrains Mono",
    "Fira Code", "Sarasa Mono SC", "Noto Sans Mono CJK SC",
    "Source Han Mono SC", "SFMono-Regular", Consolas, "Liberation Mono",
    monospace;
  font-variant-ligatures: contextual;
}

.diagram {
  margin: 1.8em 0;
}

.diagram img {
  display: block;
  width: 100%;
  height: auto;
  background: #ffffff;
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  box-shadow: var(--glow);
}

.diagram figcaption {
  margin-top: 0.55em;
  color: var(--text-soft);
  font-size: 0.84rem;
  text-align: center;
}

.table-wrap {
  margin: 1.25em 0;
  overflow-x: auto;
  border: 1px solid var(--glass-border);
  border-radius: 10px;
  background: var(--glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--glow);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

th,
td {
  padding: 9px 12px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--table-head), var(--bg-soft);
  color: var(--accent-cyan);
  font-weight: 700;
  white-space: nowrap;
}

td:first-child { color: var(--text-strong); }

tr:last-child td { border-bottom: 0; }

tbody tr:nth-child(even) td { background: var(--bg-soft); }

tbody tr {
  transition: background 0.15s ease;
}

tbody tr:hover td {
  background: var(--accent-soft);
}

.progress-table td:nth-child(2),
.progress-table td:nth-child(3),
.progress-table td:nth-child(4),
.progress-table td:nth-child(5),
.progress-table td:nth-child(6) {
  text-align: center;
}

.progress-table input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
}

.progress-table input[type="number"],
.progress-table input[type="date"],
.progress-table input[type="text"] {
  width: 100%;
  min-width: 54px;
  padding: 4px 6px;
  border: 1px solid var(--glass-border);
  border-radius: 6px;
  background: var(--input-bg);
  color: var(--text);
  font: inherit;
  font-size: 0.78rem;
}

.progress-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0.7em 0 1.6em;
}

.progress-import {
  padding: 6px 12px;
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  background: var(--glass);
  color: var(--text-soft);
  cursor: pointer;
  font-size: 0.78rem;
}

.progress-import:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.progress-summary {
  font-size: 0.8rem;
  color: var(--text-faint);
}

.progress-reset {
  padding: 6px 12px;
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  background: var(--glass);
  color: var(--text-soft);
  font: inherit;
  font-size: 0.78rem;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease,
    box-shadow 0.15s ease;
}

.progress-reset:hover {
  color: var(--accent);
  border-color: var(--accent);
  box-shadow: var(--glow);
}

.lesson-nav {
  display: flex;
  gap: 12px;
  justify-content: space-between;
  margin: 2.4em 0 0.5em;
  padding-top: 1em;
  border-top: 1px solid var(--border);
}

.lesson-nav a {
  flex: 1;
  padding: 10px 12px;
  border: 1px solid var(--glass-border);
  border-radius: 10px;
  background: var(--glass);
  color: var(--text);
  font-size: 0.86rem;
  line-height: 1.4;
  text-decoration: none;
}

.lesson-nav a:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
}

.lesson-nav .lesson-nav-label {
  display: block;
  margin-bottom: 2px;
  color: var(--text-faint);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
}

.lesson-nav .lesson-nav-next { text-align: right; }

.print-cover,
.print-toc { display: none; }

#back-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 42px;
  height: 42px;
  border: 1px solid var(--glass-border);
  border-radius: 50%;
  background: var(--glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: var(--text);
  box-shadow: var(--shadow), var(--glow);
  cursor: pointer;
  font-size: 1.1rem;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: 0.2s ease;
  z-index: 45;
}

#back-top.show {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

#back-top:hover { color: var(--accent); border-color: var(--accent); }

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track { background: transparent; }

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 8px;
  border: 2px solid transparent;
  background-clip: padding-box;
}

::-webkit-scrollbar-thumb:hover { background: var(--accent); }

html[data-reading-size="small"] { --reading-text: 15px; }
html[data-reading-size="large"] { --reading-text: 18px; }
html[data-width="wide"] { --content-width: 1120px; }

html[data-contrast="high"] {
  --text: #000000;
  --text-soft: #1f2937;
  --text-faint: #374151;
  --text-strong: #000000;
  --border: #6b7280;
  --bg: #ffffff;
  --bg-soft: #f3f4f6;
  --bg-code: #ffffff;
  --accent: #003f88;
  --accent-strong: #4c1d95;
  --accent-cyan: #155e75;
  --accent-warm: #7c2d12;
  --glass: #ffffff;
  --glass-strong: #ffffff;
  --glass-border: #6b7280;
  --input-bg: #ffffff;
  --accent-soft: #e5e7eb;
  --selection: #fde68a;
}

html[data-theme="dark"][data-contrast="high"] {
  --text: #ffffff;
  --text-soft: #e5e7eb;
  --text-faint: #d1d5db;
  --text-strong: #ffffff;
  --border: #9ca3af;
  --bg: #000000;
  --bg-soft: #111111;
  --bg-code: #0a0a0a;
  --accent: #93c5fd;
  --accent-strong: #d8b4fe;
  --accent-cyan: #67e8f9;
  --accent-warm: #fcd34d;
  --glass: #000000;
  --glass-strong: #000000;
  --glass-border: #9ca3af;
  --input-bg: #000000;
  --accent-soft: #1f2937;
  --selection: #4c1d95;
}

html[data-contrast="high"] body { background: var(--bg); }
html[data-contrast="high"] body::before { display: none; }
html[data-contrast="high"] .topbar,
html[data-contrast="high"] .sidebar,
html[data-contrast="high"] .settings-panel,
html[data-contrast="high"] .search-results { backdrop-filter: none; -webkit-backdrop-filter: none; }

html[data-motion="reduced"] *,
html[data-motion="reduced"] *::before,
html[data-motion="reduced"] *::after {
  animation: none !important;
  transition: none !important;
}

html[data-motion="reduced"] { scroll-behavior: auto; }

@media (max-width: 760px) {
  .topbar-pill { display: none; }

  .settings-panel {
    right: 12px;
    width: calc(100vw - 24px);
  }
}

@media (max-width: 980px) {
  body { background-attachment: scroll; }

  .sidebar-close { display: inline-flex; align-items: center; justify-content: center; }

  body.sidebar-open { overflow: hidden; }

  .menu-toggle { display: inline-flex; }

  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.22s ease;
    box-shadow: var(--shadow);
    z-index: 60;
    width: min(300px, 86vw);
  }

  body.sidebar-open .sidebar { transform: translateX(0); }
  body.sidebar-open .overlay { display: block; }

  .content { margin-left: 0; }

  article { padding: 30px 20px 84px; }

  article h2 { font-size: 1.4rem; }

  .table-wrap { font-size: 0.86rem; }
}

@media (max-width: 600px) {
  .topbar { padding: 0 12px; }
  .brand { font-size: 0.92rem; }
  .text-btn { display: none; }
  article { padding: 24px 14px 76px; }
  article h2 { font-size: 1.28rem; }
  article h3 { font-size: 1.1rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }
}

@media print {
  @page {
    margin: 16mm 14mm 18mm;
    @bottom-center { content: "第 " counter(page) " 页"; }
  }

  .print-cover,
  .print-toc { display: block; }

  .print-cover {
    break-after: page;
    padding: 34mm 8mm 0;
    color: #111;
  }

  .print-cover .print-kicker {
    margin: 0 0 14mm;
    color: #0e7490;
    font-size: 10pt;
    font-weight: 700;
    letter-spacing: 0.28em;
  }

  .print-cover h1 {
    margin: 0 0 8mm;
    color: #111;
    font-size: 34pt;
    font-weight: 700;
    line-height: 1.2;
    -webkit-text-fill-color: #111;
  }

  .print-cover .print-subtitle {
    margin: 0 0 4mm;
    color: #374151;
    font-size: 14pt;
  }

  .print-cover .print-meta {
    color: #6b7280;
    font-size: 10pt;
  }

  .print-toc {
    break-after: page;
    column-count: 2;
    column-gap: 22mm;
    color: #111;
  }

  .print-toc h2 {
    margin: 0 0 8mm;
    color: #111;
    font-size: 22pt;
    column-span: all;
  }

  .print-toc a {
    display: block;
    padding: 2.2mm 0;
    border-bottom: 1px solid #e5e7eb;
    color: #111;
    font-size: 10.5pt;
    line-height: 1.35;
    text-decoration: none;
    break-inside: avoid;
  }

  article > h1 { display: none; }

  article h2[id^="lesson-"] { break-before: page; }

  article h1,
  article h2,
  article h3 { break-after: avoid; }

  article p,
  article li { orphans: 3; widows: 3; }

  .topbar,
  .sidebar,
  .overlay,
  #back-top,
  .progress,
  .skip-link,
  .code-head,
  .header-anchor,
  .settings-panel,
  .search-results,
  .lesson-nav {
    display: none !important;
  }

  body::before { display: none; }

  /* 打印统一使用浅色，避免深色主题下“白纸浅字”。 */
  body,
  article { background: #fff !important; color: #111 !important; }

  .highlight,
  .highlight * { background: transparent !important; color: #111 !important; }

  .code-block {
    background: #fff !important;
    border-color: #ddd !important;
    box-shadow: none !important;
  }

  .code-block pre { background: #fff !important; }

  table,
  th,
  td { border-color: #bbb !important; }

  th { background: #f2f2f2 !important; }

  article h1 {
    background: none;
    color: #000;
    -webkit-text-fill-color: #000;
  }

  article h1::before,
  article h2::after,
  article h3::before { display: none; }

  .layout { padding-top: 0; }
  .content { margin-left: 0; }
  article { max-width: none; padding: 0; }
  .code-block,
  .diagram,
  details.quiz,
  table,
  blockquote { break-inside: avoid; }

  details > *:not(summary) { display: block !important; }
  a { color: inherit; text-decoration: none; }
}

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[data-theme="light"] .highlight { background: #fbfbfd; color: #000 }
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[data-theme="light"] .highlight .err { color: #CD3131 } /* Error */
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[data-theme="light"] .highlight .n { color: #001080 } /* Name */
[data-theme="light"] .highlight .o { color: #000 } /* Operator */
[data-theme="light"] .highlight .p { color: #000 } /* Punctuation */
[data-theme="light"] .highlight .ch { color: #008000 } /* Comment.Hashbang */
[data-theme="light"] .highlight .cm { color: #008000 } /* Comment.Multiline */
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[data-theme="light"] .highlight .cpf { color: #008000 } /* Comment.PreprocFile */
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[data-theme="light"] .highlight .gd { color: #A31515 } /* Generic.Deleted */
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[data-theme="light"] .highlight .nf { color: #795E26 } /* Name.Function */
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[data-theme="light"] .highlight .nn { color: #267F99 } /* Name.Namespace */
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[data-theme="light"] .highlight .pm { color: #000 } /* Punctuation.Marker */
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[data-theme="light"] .highlight .mo { color: #098658 } /* Literal.Number.Oct */
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[data-theme="light"] .highlight .dl { color: #A31515 } /* Literal.String.Delimiter */
[data-theme="light"] .highlight .sd { color: #008000 } /* Literal.String.Doc */
[data-theme="light"] .highlight .s2 { color: #A31515 } /* Literal.String.Double */
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[data-theme="light"] .highlight .sx { color: #A31515 } /* Literal.String.Other */
[data-theme="light"] .highlight .sr { color: #811F3F } /* Literal.String.Regex */
[data-theme="light"] .highlight .s1 { color: #A31515 } /* Literal.String.Single */
[data-theme="light"] .highlight .ss { color: #0070C1 } /* Literal.String.Symbol */
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[data-theme="light"] .highlight .fm { color: #795E26 } /* Name.Function.Magic */
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[data-theme="dark"] .highlight .hll { background-color: #2c313c }
[data-theme="dark"] .highlight { background: #23272e; color: #ABB2BF }
[data-theme="dark"] .highlight .c { color: #7F848E } /* Comment */
[data-theme="dark"] .highlight .err { color: #E06C75 } /* Error */
[data-theme="dark"] .highlight .k { color: #C678DD } /* Keyword */
[data-theme="dark"] .highlight .n { color: #E06C75 } /* Name */
[data-theme="dark"] .highlight .o { color: #56B6C2 } /* Operator */
[data-theme="dark"] .highlight .p { color: #ABB2BF } /* Punctuation */
[data-theme="dark"] .highlight .ch { color: #7F848E } /* Comment.Hashbang */
[data-theme="dark"] .highlight .cm { color: #7F848E } /* Comment.Multiline */
[data-theme="dark"] .highlight .cp { color: #7F848E } /* Comment.Preproc */
[data-theme="dark"] .highlight .cpf { color: #7F848E } /* Comment.PreprocFile */
[data-theme="dark"] .highlight .c1 { color: #7F848E } /* Comment.Single */
[data-theme="dark"] .highlight .cs { color: #7F848E } /* Comment.Special */
[data-theme="dark"] .highlight .gd { color: #E06C75 } /* Generic.Deleted */
[data-theme="dark"] .highlight .ge { font-style: italic } /* Generic.Emph */
[data-theme="dark"] .highlight .gr { color: #E06C75 } /* Generic.Error */
[data-theme="dark"] .highlight .gh { color: #E06C75; font-weight: bold } /* Generic.Heading */
[data-theme="dark"] .highlight .gi { color: #98C379 } /* Generic.Inserted */
[data-theme="dark"] .highlight .go { color: #ABB2BF } /* Generic.Output */
[data-theme="dark"] .highlight .gp { color: #5C6370 } /* Generic.Prompt */
[data-theme="dark"] .highlight .gs { font-weight: bold } /* Generic.Strong */
[data-theme="dark"] .highlight .gu { color: #E06C75; font-weight: bold } /* Generic.Subheading */
[data-theme="dark"] .highlight .gt { color: #E06C75 } /* Generic.Traceback */
[data-theme="dark"] .highlight .kc { color: #D19A66 } /* Keyword.Constant */
[data-theme="dark"] .highlight .kd { color: #C678DD } /* Keyword.Declaration */
[data-theme="dark"] .highlight .kn { color: #C678DD } /* Keyword.Namespace */
[data-theme="dark"] .highlight .kp { color: #C678DD } /* Keyword.Pseudo */
[data-theme="dark"] .highlight .kr { color: #C678DD } /* Keyword.Reserved */
[data-theme="dark"] .highlight .kt { color: #E5C07B } /* Keyword.Type */
[data-theme="dark"] .highlight .m { color: #D19A66 } /* Literal.Number */
[data-theme="dark"] .highlight .s { color: #98C379 } /* Literal.String */
[data-theme="dark"] .highlight .na { color: #D19A66 } /* Name.Attribute */
[data-theme="dark"] .highlight .nb { color: #56B6C2 } /* Name.Builtin */
[data-theme="dark"] .highlight .nc { color: #E5C07B } /* Name.Class */
[data-theme="dark"] .highlight .no { color: #E5C07B } /* Name.Constant */
[data-theme="dark"] .highlight .nd { color: #61AFEF } /* Name.Decorator */
[data-theme="dark"] .highlight .ni { color: #E06C75 } /* Name.Entity */
[data-theme="dark"] .highlight .ne { color: #E06C75 } /* Name.Exception */
[data-theme="dark"] .highlight .nf { color: #61AFEF } /* Name.Function */
[data-theme="dark"] .highlight .nl { color: #E5C07B } /* Name.Label */
[data-theme="dark"] .highlight .nn { color: #E5C07B } /* Name.Namespace */
[data-theme="dark"] .highlight .nx { color: #E06C75 } /* Name.Other */
[data-theme="dark"] .highlight .py { color: #E06C75 } /* Name.Property */
[data-theme="dark"] .highlight .nt { color: #E06C75 } /* Name.Tag */
[data-theme="dark"] .highlight .nv { color: #E06C75 } /* Name.Variable */
[data-theme="dark"] .highlight .ow { color: #C678DD } /* Operator.Word */
[data-theme="dark"] .highlight .pm { color: #ABB2BF } /* Punctuation.Marker */
[data-theme="dark"] .highlight .w { color: #ABB2BF } /* Text.Whitespace */
[data-theme="dark"] .highlight .mb { color: #D19A66 } /* Literal.Number.Bin */
[data-theme="dark"] .highlight .mf { color: #D19A66 } /* Literal.Number.Float */
[data-theme="dark"] .highlight .mh { color: #D19A66 } /* Literal.Number.Hex */
[data-theme="dark"] .highlight .mi { color: #D19A66 } /* Literal.Number.Integer */
[data-theme="dark"] .highlight .mo { color: #D19A66 } /* Literal.Number.Oct */
[data-theme="dark"] .highlight .sa { color: #98C379 } /* Literal.String.Affix */
[data-theme="dark"] .highlight .sb { color: #98C379 } /* Literal.String.Backtick */
[data-theme="dark"] .highlight .sc { color: #98C379 } /* Literal.String.Char */
[data-theme="dark"] .highlight .dl { color: #98C379 } /* Literal.String.Delimiter */
[data-theme="dark"] .highlight .sd { color: #7F848E } /* Literal.String.Doc */
[data-theme="dark"] .highlight .s2 { color: #98C379 } /* Literal.String.Double */
[data-theme="dark"] .highlight .se { color: #56B6C2 } /* Literal.String.Escape */
[data-theme="dark"] .highlight .sh { color: #98C379 } /* Literal.String.Heredoc */
[data-theme="dark"] .highlight .si { color: #56B6C2 } /* Literal.String.Interpol */
[data-theme="dark"] .highlight .sx { color: #98C379 } /* Literal.String.Other */
[data-theme="dark"] .highlight .sr { color: #56B6C2 } /* Literal.String.Regex */
[data-theme="dark"] .highlight .s1 { color: #98C379 } /* Literal.String.Single */
[data-theme="dark"] .highlight .ss { color: #56B6C2 } /* Literal.String.Symbol */
[data-theme="dark"] .highlight .bp { color: #E06C75 } /* Name.Builtin.Pseudo */
[data-theme="dark"] .highlight .fm { color: #61AFEF } /* Name.Function.Magic */
[data-theme="dark"] .highlight .vc { color: #E06C75 } /* Name.Variable.Class */
[data-theme="dark"] .highlight .vg { color: #E06C75 } /* Name.Variable.Global */
[data-theme="dark"] .highlight .vi { color: #E06C75 } /* Name.Variable.Instance */
[data-theme="dark"] .highlight .vm { color: #E06C75 } /* Name.Variable.Magic */
[data-theme="dark"] .highlight .il { color: #D19A66 } /* Literal.Number.Integer.Long */