/* =====================================================================
   银河官网3868 · /assets/site.css
   共享外壳：reset、设计变量、中文排版、头部、页脚、按钮、
   容器、栅格与基础组件（页面专属 CSS 在其后加载）
   ===================================================================== */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 9rem;
}

body, h1, h2, h3, h4, h5, p, ul, ol, li, figure, blockquote, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video, canvas { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }
hr { border: 0; }

/* ---------- 2. 设计变量 ---------- */
:root {
  --void: #05070F;
  --abyss: #0B1024;
  --indigo: #141B3A;
  --orbit: #2A3566;
  --purple: #6F4BD8;
  --pink: #C86BFF;
  --pulse: #35E0D6;
  --amber: #FFC24B;
  --stardust: #E8ECFF;
  --grey: #9AA4C8;

  --font-sans: "Space Grotesk", "Sora", "HarmonyOS Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", "Menlo", monospace;

  --shell: 1200px;
  --gutter: clamp(1.1rem, 4vw, 2.5rem);
  --radius-s: 10px;
  --radius: 18px;
  --radius-l: 26px;

  --line: 1px solid rgba(42, 53, 102, 0.72);
  --line-soft: 1px solid rgba(42, 53, 102, 0.42);
  --glass: rgba(11, 16, 36, 0.68);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --glow-purple: 0 0 26px rgba(111, 75, 216, 0.42);
  --glow-pulse: 0 0 18px rgba(53, 224, 214, 0.35);
  --glow-amber: 0 0 22px rgba(255, 194, 75, 0.35);
}

/* ---------- 3. 基底与星云背景 ---------- */
body {
  min-height: 100%;
  font-family: var(--font-sans);
  font-size: clamp(15.5px, 0.32vw + 15px, 17px);
  font-weight: 450;
  line-height: 1.85;
  letter-spacing: 0.01em;
  color: var(--stardust);
  background-color: var(--void);
  background-image:
    radial-gradient(920px 620px at 80% -12%, rgba(111, 75, 216, 0.30), transparent 70%),
    radial-gradient(760px 540px at 4% 10%, rgba(53, 224, 214, 0.10), transparent 66%),
    radial-gradient(1200px 800px at 50% 118%, rgba(200, 107, 255, 0.14), transparent 72%);
  background-attachment: fixed;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.55;
  background-image:
    radial-gradient(1.4px 1.4px at 22% 28%, rgba(232, 236, 255, 0.6), transparent 60%),
    radial-gradient(1.2px 1.2px at 68% 62%, rgba(200, 107, 255, 0.5), transparent 60%),
    radial-gradient(1.6px 1.6px at 44% 84%, rgba(53, 224, 214, 0.4), transparent 60%);
  background-size: 420px 420px, 680px 680px, 900px 900px;
  background-repeat: repeat;
}

#main-content {
  position: relative;
  z-index: 1;
  display: block;
}

/* ---------- 4. 中文排版 ---------- */
h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: 0.025em;
  text-wrap: balance;
}

h1 { font-size: clamp(2.2rem, 6vw, 4.4rem); letter-spacing: 0.03em; }
h2 { font-size: clamp(1.7rem, 3.6vw, 2.7rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.5rem); }

p { text-wrap: pretty; }

.mono,
code, kbd, samp {
  font-family: var(--font-mono);
  font-size: 0.78em;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--grey);
}

button.copy-btn,
.link-btn,
.to-top { font-family: var(--font-sans); }

::selection { background: rgba(111, 75, 216, 0.55); color: var(--stardust); }

:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ---------- 5. 布局容器 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  position: relative;
  padding-block: clamp(3.5rem, 8vw, 7rem);
}

.section--tight { padding-block: clamp(2.2rem, 5vw, 4rem); }

.section__head {
  max-width: 62ch;
  margin-bottom: clamp(1.6rem, 3vw, 2.8rem);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--pulse);
  margin-bottom: 0.9rem;
}

.eyebrow::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--pulse);
  box-shadow: var(--glow-pulse);
  animation: breathe 3.6s ease-in-out infinite;
}

.section-title {
  font-size: clamp(1.7rem, 3.6vw, 2.7rem);
  text-shadow: 0 0 28px rgba(111, 75, 216, 0.34), 0 0 60px rgba(53, 224, 214, 0.12);
}

.lede {
  margin-top: 1rem;
  max-width: 38ch;
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  line-height: 1.9;
  color: var(--grey);
}

/* ---------- 6. 栅格 ---------- */
.grid { display: grid; gap: clamp(1rem, 2.2vw, 1.9rem); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr)); }

.grid--asym { grid-template-columns: 1fr; }

@media (min-width: 960px) {
  .grid--asym {
    grid-template-columns: 5fr 3fr;
    align-items: start;
  }
  .grid--asym > .grid--offset { transform: translateY(3.5rem); }
}

/* ---------- 7. 按钮与交互件 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 44px;
  min-width: 44px;
  padding: 0.62rem 1.25rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 0.94rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1.2;
  transition: transform 0.28s var(--ease), background-color 0.28s var(--ease),
    border-color 0.28s var(--ease), color 0.28s var(--ease), box-shadow 0.28s var(--ease);
}

.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn--energy {
  background: linear-gradient(135deg, #FFD074, var(--amber));
  color: #1A1305;
  box-shadow: var(--glow-amber);
}

.btn--energy:hover { box-shadow: 0 0 30px rgba(255, 194, 75, 0.55); }

.btn--ghost {
  border-color: rgba(53, 224, 214, 0.42);
  color: var(--stardust);
  background: rgba(20, 27, 58, 0.55);
}

.btn--ghost:hover {
  border-color: var(--pulse);
  background: rgba(53, 224, 214, 0.10);
  box-shadow: var(--glow-pulse);
}

.btn--quiet {
  padding-inline: 0.2rem;
  color: var(--grey);
  text-decoration: underline;
  text-decoration-color: rgba(111, 75, 216, 0.7);
  text-underline-offset: 5px;
}

.btn--quiet:hover { color: var(--stardust); text-decoration-color: var(--pulse); }

.link-btn {
  padding: 0.15rem 0;
  color: var(--grey);
  font-size: 0.86rem;
  letter-spacing: 0.06em;
  border-bottom: 1px solid transparent;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.link-btn:hover { color: var(--pulse); border-color: var(--pulse); }

.copy-btn {
  padding: 0.15rem 0.6rem;
  border: 1px solid rgba(53, 224, 214, 0.34);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--pulse);
  transition: background-color 0.25s var(--ease), color 0.25s var(--ease);
}

.copy-btn:hover { background: rgba(53, 224, 214, 0.14); color: var(--stardust); }

.scroll-progress {
  position: absolute;
  inset: auto 0 0 0;
  height: 2px;
  background: rgba(42, 53, 102, 0.5);
  overflow: hidden;
}

.scroll-progress__bar {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--pulse), var(--pink), var(--amber));
}

.to-top {
  position: fixed;
  right: clamp(1rem, 3vw, 2.2rem);
  bottom: clamp(1rem, 3vw, 2.2rem);
  z-index: 70;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  font-size: 1.1rem;
  color: var(--stardust);
  background: var(--glass);
  border: 1px solid rgba(53, 224, 214, 0.38);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease), visibility 0.3s linear;
}

.to-top.is-active { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { border-color: var(--pulse); box-shadow: var(--glow-pulse); }

.skip-link {
  position: absolute;
  left: 50%;
  top: 0;
  transform: translate(-50%, -140%);
  z-index: 90;
  padding: 0.7rem 1.3rem;
  border-radius: 0 0 var(--radius-s) var(--radius-s);
  background: var(--amber);
  color: #1A1305;
  font-weight: 700;
  font-size: 0.9rem;
  transition: transform 0.25s var(--ease);
}

.skip-link:focus { transform: translate(-50%, 0); }

/* ---------- 8. 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: linear-gradient(180deg, rgba(5, 7, 15, 0.94), rgba(11, 16, 36, 0.82));
  border-bottom: var(--line);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.header-top { padding-block: 0.7rem; }

.header-top__inner {
  display: flex;
  align-items: center;
  gap: clamp(0.8rem, 2vw, 1.6rem);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  flex: 0 1 auto;
  min-width: 0;
}

.brand__mark {
  position: relative;
  flex: none;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: radial-gradient(circle at 32% 28%, var(--pink), var(--purple) 46%, var(--indigo) 78%);
  box-shadow: 0 0 0 1px rgba(53, 224, 214, 0.32), 0 0 22px rgba(111, 75, 216, 0.45);
}

.brand__mark::after {
  content: "";
  position: absolute;
  inset: -5px;
  border-radius: 50%;
  border: 1px solid rgba(53, 224, 214, 0.5);
  border-top-color: transparent;
  border-bottom-color: transparent;
  animation: orbit-spin 16s linear infinite;
}

.brand__text { display: flex; flex-direction: column; min-width: 0; }

.brand__name {
  font-size: 1.06rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.25;
  white-space: nowrap;
}

.brand__tagline {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.14em;
  color: var(--grey);
  white-space: nowrap;
}

.header-meta {
  margin-left: auto;
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  color: rgba(154, 164, 200, 0.78);
}

.header-actions {
  display: none;
  gap: 0.6rem;
  align-items: center;
}

.header-actions .btn { font-size: 0.86rem; padding: 0.55rem 1.05rem; }

.nav-toggle {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 44px;
  padding: 0.45rem 0.85rem;
  border: var(--line);
  border-radius: 999px;
  background: rgba(20, 27, 58, 0.6);
  color: var(--stardust);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
}

.nav-toggle__bars {
  position: relative;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--pulse);
  box-shadow: 0 6px 0 0 rgba(53, 224, 214, 0.55), 0 -6px 0 0 rgba(53, 224, 214, 0.55);
  transition: transform 0.3s var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars {
  transform: rotate(45deg);
  box-shadow: 0 0 0 0 transparent, 0 0 0 0 transparent;
}

.header-nav {
  border-top: var(--line-soft);
  background: linear-gradient(180deg, rgba(11, 16, 36, 0.55), rgba(5, 7, 15, 0.2));
}

.header-nav__inner {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-nodes {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 0.2rem;
  width: 100%;
}

.nav-node {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.05rem;
  padding: 0.55rem 1rem 0.6rem;
  border: 1px solid transparent;
  border-radius: 12px 12px 0 0;
  color: var(--grey);
  transition: color 0.26s var(--ease), background-color 0.26s var(--ease), border-color 0.26s var(--ease);
}

.nav-node__idx {
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  color: rgba(154, 164, 200, 0.62);
  transition: color 0.26s var(--ease);
}

.nav-node__label { font-size: 0.95rem; font-weight: 600; letter-spacing: 0.06em; }

.nav-node:hover {
  color: var(--stardust);
  background: rgba(20, 27, 58, 0.72);
  border-color: rgba(42, 53, 102, 0.9);
}

.nav-node:hover .nav-node__idx { color: var(--pulse); }

.nav-node[aria-current="page"] {
  color: var(--stardust);
  background: linear-gradient(180deg, rgba(111, 75, 216, 0.28), rgba(20, 27, 58, 0.5));
  border-color: rgba(111, 75, 216, 0.6);
  box-shadow: inset 0 -2px 0 0 var(--pulse);
}

.nav-node[aria-current="page"] .nav-node__idx { color: var(--pulse); }
.nav-node[aria-current="page"] .nav-node__label { text-shadow: 0 0 18px rgba(200, 107, 255, 0.45); }

.header-nav__foot { display: none; }

/* ---------- 9. 页脚 ---------- */
.site-footer {
  position: relative;
  z-index: 1;
  margin-top: clamp(3rem, 7vw, 6rem);
  padding-top: clamp(2.6rem, 6vw, 4.5rem);
  border-top: var(--line);
  background:
    radial-gradient(900px 420px at 85% 0%, rgba(111, 75, 216, 0.22), transparent 70%),
    linear-gradient(180deg, rgba(11, 16, 36, 0.9), rgba(5, 7, 15, 0.98));
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.8rem, 4vw, 3rem);
  padding-bottom: clamp(2rem, 4vw, 3rem);
}

.footer-brand .brand { margin-bottom: 1rem; }

.footer-lead {
  max-width: 40ch;
  color: var(--grey);
  font-size: 0.94rem;
  line-height: 1.85;
}

.footer-contact {
  margin-top: 1.4rem;
  display: grid;
  gap: 0.6rem;
}

.footer-contact__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.footer-contact__key {
  min-width: 4.6rem;
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  color: rgba(154, 164, 200, 0.7);
}

.footer-contact__val { font-size: 0.92rem; color: var(--stardust); }

.footer-notes { display: grid; gap: 0.7rem; align-content: start; }

.footer-note {
  max-width: 46ch;
  font-size: 0.78rem;
  line-height: 1.8;
  color: rgba(154, 164, 200, 0.82);
  padding-left: 0.9rem;
  border-left: 2px solid rgba(111, 75, 216, 0.5);
}

.footer-col__title {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--pulse);
  margin-bottom: 0.9rem;
}

.footer-links { display: grid; gap: 0.55rem; }

.footer-links a {
  display: inline-block;
  font-size: 0.94rem;
  color: var(--grey);
  transition: color 0.25s var(--ease), transform 0.25s var(--ease);
}

.footer-links a:hover { color: var(--stardust); transform: translateX(4px); }

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem 1.6rem;
  padding-block: 1.2rem 1.6rem;
  border-top: var(--line-soft);
}

.footer-legal__line { font-size: 0.68rem; letter-spacing: 0.08em; }

.footer-utility {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.2rem;
  align-items: center;
}

.footer-utility a {
  font-size: 0.86rem;
  color: var(--grey);
  transition: color 0.25s var(--ease);
}

.footer-utility a:hover { color: var(--pulse); }

/* ---------- 10. 基础组件 ---------- */
.card {
  position: relative;
  padding: clamp(1.2rem, 2.4vw, 1.9rem);
  border: var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(20, 27, 58, 0.96), rgba(11, 16, 36, 0.98));
  transition: transform 0.35s var(--ease), border-color 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  background: linear-gradient(135deg, rgba(53, 224, 214, 0.16), transparent 42%);
  opacity: 0;
  transition: opacity 0.35s var(--ease);
}

.card:hover { transform: translateY(-4px); border-color: rgba(53, 224, 214, 0.4); box-shadow: 0 18px 40px rgba(5, 7, 15, 0.6); }
.card:hover::after { opacity: 1; }

.card--glass {
  background: var(--glass);
  border-color: rgba(42, 53, 102, 0.6);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.card__index {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  color: var(--pulse);
  margin-bottom: 0.65rem;
}

.card__title {
  font-size: clamp(1.05rem, 1.6vw, 1.3rem);
  margin-bottom: 0.55rem;
}

.card__text { color: var(--grey); font-size: 0.94rem; line-height: 1.85; }

.card__foot {
  margin-top: 1.1rem;
  padding-top: 0.9rem;
  border-top: var(--line-soft);
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.22rem 0.7rem;
  border-radius: 999px;
  border: 1px solid rgba(42, 53, 102, 0.9);
  background: rgba(20, 27, 58, 0.7);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  color: var(--grey);
}

.tag--pulse { border-color: rgba(53, 224, 214, 0.5); color: var(--pulse); }
.tag--amber { border-color: rgba(255, 194, 75, 0.5); color: var(--amber); }

.stat {
  padding: 1.1rem 1.2rem;
  border: var(--line-soft);
  border-radius: var(--radius-s);
  background: rgba(20, 27, 58, 0.55);
}

.stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 2.4vw, 1.9rem);
  color: var(--stardust);
  letter-spacing: 0.06em;
}

.stat__label {
  display: block;
  margin-top: 0.3rem;
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  color: var(--grey);
}

.divider-orbit {
  position: relative;
  height: 1px;
  margin-block: clamp(2rem, 4vw, 3.2rem);
  background: linear-gradient(90deg, transparent, rgba(42, 53, 102, 0.9) 22%, rgba(42, 53, 102, 0.9) 78%, transparent);
}

.divider-orbit::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  background: var(--pulse);
  box-shadow: var(--glow-pulse);
  animation: breathe 4s ease-in-out infinite;
}

.media {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  border: var(--line);
  background: linear-gradient(150deg, rgba(111, 75, 216, 0.28), rgba(11, 16, 36, 0.95) 62%);
  aspect-ratio: 16 / 10;
}

.media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 3 / 4; }

.media--orbit::before {
  content: "";
  position: absolute;
  inset: -18%;
  border-radius: 50%;
  border: 1px solid rgba(53, 224, 214, 0.28);
  border-left-color: transparent;
  border-right-color: transparent;
  animation: orbit-spin 90s linear infinite;
  pointer-events: none;
}

.media__caption {
  margin-top: 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--grey);
}

.prose { max-width: 38ch; color: var(--grey); }
.prose > * + * { margin-top: 1.1rem; }
.prose h2, .prose h3 { color: var(--stardust); margin-top: 2.2rem; }
.prose strong { color: var(--stardust); font-weight: 600; }
.prose a { color: var(--pulse); border-bottom: 1px solid rgba(53, 224, 214, 0.45); }
.prose ul, .prose ol { display: grid; gap: 0.6rem; padding-left: 1.1rem; }
.prose ul li { list-style: none; position: relative; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: -1rem;
  top: 0.72em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--purple);
}
.prose ol { list-style: decimal; }
.prose blockquote {
  padding: 0.9rem 1.2rem;
  border-left: 2px solid var(--pink);
  background: rgba(20, 27, 58, 0.6);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
}

.breadcrumbs { padding-block: 1.1rem 0; }

.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--grey);
}

.breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  margin-right: 0.5rem;
  color: rgba(42, 53, 102, 1);
}

.breadcrumbs a:hover { color: var(--pulse); }

.toc {
  padding: 1.1rem 1.2rem;
  border: var(--line-soft);
  border-radius: var(--radius);
  background: var(--glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.toc__title {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--pulse);
  margin-bottom: 0.8rem;
}

.toc__list { display: grid; gap: 0.35rem; }

.toc__link {
  display: block;
  padding: 0.35rem 0.6rem;
  border-left: 2px solid rgba(42, 53, 102, 0.9);
  font-size: 0.88rem;
  color: var(--grey);
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease), background-color 0.25s var(--ease);
}

.toc__link:hover { color: var(--stardust); background: rgba(20, 27, 58, 0.6); }

.toc__link[aria-current="true"] {
  color: var(--stardust);
  border-color: var(--pulse);
  background: rgba(53, 224, 214, 0.08);
}

/* ---------- 11. 进场与动效 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.65s var(--ease), transform 0.65s var(--ease);
  transition-delay: var(--reveal-delay, 0s);
}

[data-reveal].is-visible { opacity: 1; transform: none; }

@keyframes orbit-spin { to { transform: rotate(360deg); } }

@keyframes breathe {
  0%, 100% { opacity: 0.55; transform: scale(0.92); }
  50% { opacity: 1; transform: scale(1.06); }
}

/* ---------- 12. 平板 ---------- */
@media (min-width: 700px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-notes { grid-column: span 2; }
}

/* ---------- 13. 桌面 ---------- */
@media (min-width: 1024px) {
  .header-actions { display: flex; }
  .nav-toggle { display: none; }
  .header-meta { margin-left: auto; margin-right: 0.4rem; }

  .nav-nodes { flex-wrap: nowrap; }
  .header-nav__inner { padding-block: 0.15rem; }

  .footer-grid {
    grid-template-columns: minmax(280px, 1.7fr) repeat(3, minmax(140px, 0.8fr));
  }
  .footer-notes { grid-column: 1 / -1; }
  .footer-notes { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* ---------- 14. 移动端折叠导航 ---------- */
@media (max-width: 1023.98px) {
  .header-nav {
    overflow: hidden;
    max-height: 0;
    opacity: 0;
    visibility: hidden;
    transition: max-height 0.4s var(--ease), opacity 0.3s var(--ease), visibility 0.3s linear;
  }

  .header-nav[data-open] {
    max-height: 78vh;
    opacity: 1;
    visibility: visible;
    overflow-y: auto;
  }

  .header-nav__inner {
    flex-direction: column;
    align-items: stretch;
    padding-block: 0.8rem 1.1rem;
    gap: 0.7rem;
  }

  .nav-nodes { flex-direction: column; gap: 0.25rem; }

  .nav-node {
    flex-direction: row;
    align-items: baseline;
    gap: 0.75rem;
    padding: 0.7rem 0.9rem;
    border-radius: 12px;
    border-color: rgba(42, 53, 102, 0.5);
    background: rgba(11, 16, 36, 0.5);
  }

  .nav-node[aria-current="page"] { box-shadow: inset 2px 0 0 0 var(--pulse); }

  .header-nav__foot {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    padding-top: 0.7rem;
    border-top: var(--line-soft);
  }

  .header-nav__foot .btn { flex: 1 1 160px; }
}

@media (max-width: 560px) {
  .header-meta { display: none; }
  .brand__tagline { font-size: 0.6rem; letter-spacing: 0.1em; }
  .footer-legal { flex-direction: column; align-items: flex-start; }
}

/* ---------- 15. 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  [data-reveal] { opacity: 1; transform: none; }
  .to-top { transform: none; }
}