/* ============================================================
   捕鱼吧电玩 · 共享样式表
   文件位置：/assets/site.css
   覆盖：reset / 变量 / 中文排版 / 页头 / 页脚 / 按钮 / 面包屑
        正文容器 / 网格 / 基础组件 / 图片容器 / 动效
   ============================================================ */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
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%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }

/* ---------- 2. 设计令牌 ---------- */
:root {
  --abyss: #071426;
  --mid-water: #0E2B4A;
  --paper: #F4ECDD;
  --ink: #2A1B12;
  --neon: #3FF0D8;
  --coral: #FF6B4A;
  --violet: #8B5CF6;
  --gold: #FFC24B;
  --mist: #9FD9E8;
  --kelp: #35C08A;
  --coral-soft: #FFE3D9;
  --deep-red: #E23E57;

  --text: #DCE9F2;
  --text-dim: #9FD9E8;
  --text-mute: #7FA3B4;

  --font-display: "Yuanti SC", "YouYuan", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  --rail-w: 15rem;
  --header-h: 60px;
  --gutter: clamp(1.15rem, 4vw, 3.25rem);
  --maxw: 78rem;

  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 26px;
  --r-pill: 999px;

  --hair: 1px solid rgba(63, 240, 216, 0.18);
  --hair-soft: 1px solid rgba(159, 217, 232, 0.12);
  --hair-ink: 1px solid rgba(42, 27, 18, 0.16);

  --glow-neon: 0 0 18px rgba(63, 240, 216, 0.42);
  --shadow-soft: 0 24px 48px -32px rgba(0, 0, 0, 0.9);

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --t-fast: 200ms;
  --t: 360ms;
  --t-slow: 520ms;
}

/* ---------- 3. 页面基底与中文排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--abyss);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  padding-top: var(--header-h);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(58rem 58rem at 84% -14%, rgba(139, 92, 246, 0.22), transparent 62%),
    radial-gradient(44rem 44rem at -10% 108%, rgba(63, 240, 216, 0.15), transparent 60%),
    radial-gradient(30rem 30rem at 52% 48%, rgba(255, 107, 74, 0.06), transparent 72%);
}
.site-main, .site-footer { position: relative; z-index: 1; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.008em;
  color: #EFFBFF;
  text-wrap: balance;
}
h1 { font-size: clamp(2.3rem, 7vw, 5.4rem); font-weight: 900; letter-spacing: -0.022em; line-height: 1.08; }
h2 { font-size: clamp(1.65rem, 4vw, 2.8rem); }
h3 { font-size: clamp(1.2rem, 2.4vw, 1.55rem); }
h4 { font-size: 1.05rem; letter-spacing: 0.01em; }
strong { font-weight: 800; color: #FFFFFF; }
small { font-size: 0.82rem; color: var(--text-mute); }

p { max-width: none; }
[id] { scroll-margin-top: calc(var(--header-h) + 1.25rem); }

::selection { background: var(--neon); color: var(--abyss); }

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

/* ---------- 4. 布局容器与网格 ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container--narrow { max-width: 60rem; }

.section { padding-block: clamp(2.5rem, 7vw, 5.5rem); position: relative; }
.section--tight { padding-block: clamp(1.75rem, 4.5vw, 3rem); }
.section--paper {
  background: var(--paper);
  color: var(--ink);
  border-top: 1px solid rgba(42, 27, 18, 0.12);
  border-bottom: 1px solid rgba(42, 27, 18, 0.12);
}
.section--paper h1,
.section--paper h2,
.section--paper h3,
.section--paper h4 { color: #1A100A; }
.section--paper strong { color: #1A100A; }
.section--paper small { color: #6B5445; }
.section--paper a:not(.btn) { color: #B7381F; border-bottom: 1px solid rgba(183, 56, 31, 0.35); }
.section--paper a:not(.btn):hover { color: #E23E57; border-bottom-color: #E23E57; }

.stack { display: grid; gap: 1rem; }
.stack--lg { gap: clamp(1.5rem, 4vw, 2.75rem); }

.grid { display: grid; gap: clamp(1.25rem, 3vw, 2.25rem); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 18rem), 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 14rem), 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 11rem), 1fr)); }

.split { display: grid; gap: clamp(1.5rem, 4vw, 3.25rem); }
@media (min-width: 880px) {
  .split { grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr); align-items: start; }
  .split--reverse { grid-template-columns: minmax(0, 1fr) minmax(0, 1.35fr); }
}

/* ---------- 5. 文案组件 ---------- */
.kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--neon);
}
.kicker::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
  opacity: 0.75;
}
.section--paper .kicker { color: #B7381F; }

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
  color: var(--gold);
}
.section--paper .mono { color: #9A5A12; }

.lead {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  line-height: 1.7;
  color: var(--text-dim);
  max-width: 46ch;
}
.section--paper .lead { color: #4A382C; }

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 46px;
  padding: 0 1.35rem;
  border-radius: var(--r-pill);
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-size: 0.94rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: transform var(--t) var(--ease), background var(--t) var(--ease),
              color var(--t) var(--ease), box-shadow var(--t) var(--ease),
              border-color var(--t) var(--ease);
}
.btn:active { transform: translateY(1px) scale(0.985); }
.btn--coral {
  background: linear-gradient(135deg, #FF6B4A 0%, #E23E57 100%);
  color: #FFFFFF;
  box-shadow: 0 14px 30px -18px rgba(255, 107, 74, 0.95);
}
.btn--coral:hover {
  transform: translateY(-2px);
  box-shadow: 0 20px 38px -16px rgba(255, 107, 74, 1);
}
.btn--neon {
  background: var(--neon);
  color: var(--abyss);
  box-shadow: var(--glow-neon);
}
.btn--neon:hover { background: #6BF5E4; transform: translateY(-2px); }
.btn--ghost {
  border-color: rgba(63, 240, 216, 0.4);
  background: rgba(63, 240, 216, 0.06);
  color: var(--neon);
}
.btn--ghost:hover { background: rgba(63, 240, 216, 0.15); transform: translateY(-2px); }
.btn--block { display: flex; width: 100%; }

/* ---------- 7. 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  min-height: 28px;
  padding: 0.24rem 0.7rem;
  border-radius: var(--r-pill);
  border: 1px solid rgba(63, 240, 216, 0.35);
  background: rgba(63, 240, 216, 0.08);
  color: var(--neon);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  white-space: nowrap;
}
.tag--coral { border-color: rgba(255, 107, 74, 0.5); background: rgba(255, 107, 74, 0.13); color: #FFB9A6; }
.tag--violet { border-color: rgba(139, 92, 246, 0.5); background: rgba(139, 92, 246, 0.15); color: #CDB4FF; }
.tag--gold { border-color: rgba(255, 194, 75, 0.45); background: rgba(255, 194, 75, 0.13); color: var(--gold); }
.tag--kelp { border-color: rgba(53, 192, 138, 0.45); background: rgba(53, 192, 138, 0.14); color: #7EE3B8; }
.tag--ink { border-color: rgba(42, 27, 18, 0.22); background: var(--coral-soft); color: #8C3A20; }

/* ---------- 8. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-mute);
  letter-spacing: 0.02em;
}
.breadcrumb li { display: flex; align-items: center; gap: 0.5rem; }
.breadcrumb li:not(:first-child)::before { content: "›"; color: rgba(159, 217, 232, 0.45); }
.breadcrumb a { color: var(--mist); transition: color var(--t-fast) var(--ease); }
.breadcrumb a:hover { color: var(--neon); }
.breadcrumb [aria-current="page"] { color: var(--neon); }
.section--paper .breadcrumb { color: #7A6455; }
.section--paper .breadcrumb a { color: #8C3A20; }
.section--paper .breadcrumb a:hover { color: #E23E57; }

/* ---------- 9. 正文排版 ---------- */
.prose {
  max-width: 64ch;
  color: #C9E1EB;
  font-size: 1rem;
  line-height: 1.8;
}
.prose > * + * { margin-top: 1.15em; }
.prose h2 { font-size: clamp(1.45rem, 3vw, 1.95rem); margin-top: 1.9em; }
.prose h3 { font-size: clamp(1.12rem, 2.2vw, 1.3rem); margin-top: 1.7em; }
.prose p { max-width: 62ch; }
.prose ul, .prose ol { display: grid; gap: 0.6rem; margin-top: 1.1em; }
.prose ul li { position: relative; padding-left: 1.3rem; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.74em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--neon);
  box-shadow: 0 0 8px rgba(63, 240, 216, 0.8);
}
.prose ol { counter-reset: prose-ol; }
.prose ol li { position: relative; padding-left: 1.9rem; counter-increment: prose-ol; }
.prose ol li::before {
  content: counter(prose-ol, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--gold);
  line-height: 1.9;
}
.prose blockquote {
  padding: 1rem 0 1rem 1.15rem;
  border-left: 2px solid var(--neon);
  color: var(--text-dim);
  font-style: normal;
}
.section--paper .prose { color: #3A2A20; }
.section--paper .prose h2,
.section--paper .prose h3 { color: #1A100A; }
.section--paper .prose ul li::before { background: var(--coral); box-shadow: none; }
.section--paper .prose ol li::before { color: #9A5A12; }
.section--paper .prose blockquote { border-left-color: var(--coral); color: #5B4436; }

/* ---------- 10. 图片容器 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-lg);
  border: var(--hair);
  background:
    radial-gradient(120% 90% at 20% 0%, rgba(63, 240, 216, 0.16), transparent 60%),
    linear-gradient(160deg, var(--mid-water) 0%, var(--abyss) 100%);
  aspect-ratio: 16 / 10;
  box-shadow: var(--shadow-soft);
}
.media-frame img,
.media-frame svg,
.media-frame video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--round { aspect-ratio: 1 / 1; border-radius: 50%; }
.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 4rem 1.1rem 0.9rem;
  background: linear-gradient(0deg, rgba(7, 20, 38, 0.94), rgba(7, 20, 38, 0));
  font-size: 0.8rem;
  line-height: 1.6;
  color: #C9E1EB;
}
.media-frame--placeholder::after {
  content: "";
  position: absolute;
  inset: 22%;
  border-radius: 50%;
  border: 1px solid rgba(63, 240, 216, 0.4);
  box-shadow: inset 0 0 40px rgba(63, 240, 216, 0.16);
  animation: sonar-pulse 3.6s var(--ease) infinite;
}
.media-frame--placeholder::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 12px;
  height: 12px;
  margin: -6px 0 0 -6px;
  border-radius: 50%;
  background: var(--neon);
  box-shadow: 0 0 20px rgba(63, 240, 216, 0.9);
}
@keyframes sonar-pulse {
  0% { transform: scale(0.82); opacity: 0.9; }
  70% { opacity: 0; }
  100% { transform: scale(1.3); opacity: 0; }
}

/* ---------- 11. 页头与侧边轨道 ---------- */
.skip-link {
  position: fixed;
  top: -5rem;
  left: 1rem;
  z-index: 120;
  padding: 0.62rem 1.05rem;
  border-radius: 0 0 var(--r-sm) var(--r-sm);
  background: var(--neon);
  color: var(--abyss);
  font-size: 0.88rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  transition: top var(--t-fast) var(--ease);
}
.skip-link:focus { top: 0; }

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0;
  height: 3px;
  z-index: 90;
  background: linear-gradient(90deg, var(--neon) 0%, var(--violet) 55%, var(--coral) 100%);
  box-shadow: 0 0 12px rgba(63, 240, 216, 0.6);
  transition: width 120ms linear;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 60;
  background: #081A2E;
  border-bottom: var(--hair);
}

.site-header__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: var(--header-h);
  padding: 0 clamp(0.85rem, 4vw, 1.25rem);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  min-height: 44px;
}
.brand__mark {
  position: relative;
  flex: none;
  display: block;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: radial-gradient(circle at 34% 28%, #3FF0D8 0%, #1B6F9A 52%, #071426 100%);
  box-shadow: 0 0 0 1px rgba(63, 240, 216, 0.5), 0 0 16px rgba(63, 240, 216, 0.4);
}
.brand__mark::after {
  content: "";
  position: absolute;
  inset: 28%;
  border-radius: 50%;
  border: 1.4px solid rgba(7, 20, 38, 0.72);
}
.brand__text { display: flex; flex-direction: column; line-height: 1.15; }
.brand__name {
  font-family: var(--font-display);
  font-size: 1.04rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: #EAF9FF;
}
.brand__tag {
  font-size: 0.68rem;
  letter-spacing: 0.26em;
  color: var(--mist);
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  height: 44px;
  padding: 0 0.9rem;
  border-radius: var(--r-pill);
  border: 1px solid rgba(63, 240, 216, 0.32);
  background: rgba(63, 240, 216, 0.07);
  color: var(--neon);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  transition: background var(--t) var(--ease), border-color var(--t) var(--ease);
}
.nav-toggle:hover { background: rgba(63, 240, 216, 0.15); }
.nav-toggle__bars { display: inline-flex; flex-direction: column; gap: 3.5px; width: 16px; }
.nav-toggle__bars i {
  display: block;
  height: 1.6px;
  border-radius: 2px;
  background: currentColor;
  transition: transform var(--t) var(--ease), opacity var(--t) var(--ease);
}
.site-header[data-open] .nav-toggle__bars i:nth-child(1) { transform: translateY(5.1px) rotate(45deg); }
.site-header[data-open] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.site-header[data-open] .nav-toggle__bars i:nth-child(3) { transform: translateY(-5.1px) rotate(-45deg); }

/* ---------- 12. 导航 ---------- */
.site-nav {
  position: fixed;
  left: 0;
  right: 0;
  top: var(--header-h);
  max-height: calc(100vh - var(--header-h));
  overflow-y: auto;
  padding: 1.1rem clamp(0.85rem, 4vw, 1.25rem) 1.75rem;
  background: linear-gradient(180deg, #081A2E 0%, #0E2B4A 100%);
  border-bottom: var(--hair);
  box-shadow: 0 32px 64px -32px rgba(0, 0, 0, 0.95);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-14px);
  transition: opacity var(--t) var(--ease), transform var(--t) var(--ease), visibility var(--t) var(--ease);
}
.site-header[data-open] .site-nav {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.site-nav__hint {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.26em;
  color: rgba(159, 217, 232, 0.55);
}
.site-nav__list { display: grid; gap: 0.3rem; margin-top: 0.7rem; }

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-height: 46px;
  padding: 0.6rem 0.8rem;
  border-radius: 12px;
  border: 1px solid transparent;
  color: #BBD9E4;
  font-size: 0.97rem;
  letter-spacing: 0.03em;
  transition: background var(--t) var(--ease), color var(--t) var(--ease),
              border-color var(--t) var(--ease), transform var(--t) var(--ease),
              box-shadow var(--t) var(--ease);
}
.nav-link__idx {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: rgba(159, 217, 232, 0.5);
  transition: color var(--t) var(--ease);
}
.nav-link:hover {
  color: var(--neon);
  background: rgba(63, 240, 216, 0.09);
  border-color: rgba(63, 240, 216, 0.3);
  transform: translateX(3px);
}
.nav-link:active { transform: translateX(3px) scale(0.985); }
.nav-link[aria-current="page"] {
  background: var(--neon);
  border-color: var(--neon);
  color: var(--abyss);
  font-weight: 800;
  box-shadow: var(--glow-neon);
}
.nav-link[aria-current="page"] .nav-link__idx { color: rgba(7, 20, 38, 0.6); }

.site-nav__foot { margin-top: 1.25rem; padding-top: 1.1rem; border-top: var(--hair); }
.site-nav__note {
  margin-top: 0.75rem;
  font-size: 0.76rem;
  line-height: 1.65;
  color: var(--text-mute);
  letter-spacing: 0.02em;
}

/* 桌面端：左侧竖直轨道 */
@media (min-width: 1024px) {
  body { padding-top: 0; padding-left: var(--rail-w); }
  .scroll-progress { left: var(--rail-w); }

  .site-header {
    top: 0;
    bottom: 0;
    right: auto;
    left: 0;
    width: var(--rail-w);
    display: flex;
    flex-direction: column;
    padding: 1.75rem 1.1rem 1.15rem;
    background: linear-gradient(180deg, #081A2E 0%, #0B2340 58%, #071426 100%);
    border-bottom: 0;
    border-right: var(--hair);
  }
  .site-header__top {
    height: auto;
    padding: 0 0 1.15rem;
    border-bottom: var(--hair);
    display: block;
  }
  .nav-toggle { display: none; }
  .brand { gap: 0.6rem; }
  .brand__name { font-size: 0.98rem; }
  .brand__tag { font-size: 0.63rem; letter-spacing: 0.22em; }

  .site-nav {
    position: static;
    flex: 1;
    display: flex;
    flex-direction: column;
    max-height: none;
    overflow: visible;
    padding: 1.15rem 0 0;
    background: none;
    border-bottom: 0;
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    transform: none;
    transition: none;
  }
  .site-nav__list { gap: 0.2rem; margin-top: 0.55rem; }
  .nav-link { font-size: 0.93rem; padding: 0.55rem 0.7rem; }
  .site-nav__foot { margin-top: auto; padding-top: 1rem; }
  .site-nav__note { font-size: 0.73rem; }
}

/* ---------- 13. 页脚 ---------- */
.site-footer {
  margin-top: clamp(3rem, 8vw, 6.5rem);
  background: linear-gradient(180deg, #081A2E 0%, #050E1B 100%);
  border-top: var(--hair);
  color: var(--text-mute);
}
.site-footer__inner {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: clamp(2rem, 5vw, 3.6rem) var(--gutter) clamp(1.25rem, 3vw, 2rem);
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
}
@media (min-width: 860px) {
  .site-footer__inner { grid-template-columns: minmax(0, 1fr) minmax(0, 1.45fr); }
}
.site-footer__brand { display: grid; gap: 0.6rem; align-content: start; }
.site-footer__name {
  font-family: var(--font-display);
  font-size: 1.28rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: #EFFBFF;
}
.site-footer__tagline {
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--mist);
  max-width: 32ch;
}
.site-footer__stats {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.02em;
  color: var(--text-mute);
}

.site-footer__nav {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(8.5rem, 1fr));
}
.footer-col__title {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.24em;
  color: var(--neon);
  margin-bottom: 0.4rem;
}
.footer-col__list { display: grid; gap: 0; }
.footer-col__list a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 0.92rem;
  color: var(--mist);
  transition: color var(--t) var(--ease), transform var(--t) var(--ease);
}
.footer-col__list a:hover { color: var(--neon); transform: translateX(3px); }

.site-footer__base {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: 1.15rem var(--gutter) 2rem;
  border-top: var(--hair-soft);
  display: grid;
  gap: 1.1rem;
}
@media (min-width: 860px) {
  .site-footer__base {
    grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr);
    align-items: start;
  }
}
.site-footer__contact { display: grid; gap: 0.35rem; }
.site-footer__line {
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--text-mute);
}
.site-footer__meta {
  display: grid;
  gap: 0.35rem;
  justify-items: start;
  font-size: 0.78rem;
  color: #5E8296;
}
@media (min-width: 860px) {
  .site-footer__meta { justify-items: end; text-align: right; }
}
.site-footer__copy { letter-spacing: 0.02em; }

/* ---------- 14. 动效协议 ---------- */
[data-reveal] {
  transition: opacity var(--t-slow) var(--ease), transform var(--t-slow) var(--ease);
}
html[data-anim="on"] [data-reveal] { opacity: 0; transform: translateY(16px); }
html[data-anim="on"] [data-reveal].is-visible { opacity: 1; transform: none; }

/* ---------- 15. 响应式与偏好 ---------- */
@media (min-width: 1024px) {
  body { font-size: 17px; }
  .prose { font-size: 1.02rem; }
}
@media (min-width: 1440px) {
  :root { --rail-w: 16.5rem; }
}

@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;
  }
  html[data-anim="on"] [data-reveal] { opacity: 1 !important; transform: none !important; }
  .media-frame--placeholder::after { animation: none; opacity: 0.35; transform: scale(1); }
}