/* ==========================================================================
   鲸鱼看台 · 共享样式 /assets/site.css
   深海看台：深渊蓝底 + 信号青路径 + 珊瑚橙订阅 + 琥珀状态
   ========================================================================== */

/* ---------- 1. 设计变量 ---------- */
:root {
  --abyss: #04121F;
  --trench: #071E2E;
  --hull: #0B2C3F;
  --signal: #3FF2D0;
  --signal-dim: #1BAE97;
  --coral: #FF7A4D;
  --amber: #FFC857;
  --mist: #A7C3C8;
  --white: #EAF7F5;
  --grid: #1E4657;
  --deep-cyan: #6EE7FF;
  --ink: #04121F;

  --pad: clamp(18px, 5vw, 88px);
  --shell: min(1280px, calc(100% - (var(--pad) * 2)));
  --header-h: 68px;

  --font-display: "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", "SFMono-Regular", "Cascadia Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --ease: cubic-bezier(.2, .7, .3, 1);
  --dur: 180ms;
  --radius: 2px;
}

/* ---------- 2. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 20px);
}
body, h1, h2, h3, h4, h5, p, ul, ol, figure, blockquote, dl, dd, hr { margin: 0; }
ul[class], ol[class] { list-style: none; padding: 0; }
img, svg, video, picture { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; }
a { color: var(--signal); text-decoration-thickness: 1px; text-underline-offset: 3px; }
hr { border: 0; }
[hidden] { display: none !important; }

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--abyss);
  background-image:
    radial-gradient(1100px 620px at 88% -8%, rgba(63, 242, 208, .10), transparent 62%),
    radial-gradient(900px 560px at 4% 102%, rgba(110, 231, 255, .08), transparent 66%),
    linear-gradient(180deg, #04121F 0%, #061B29 46%, #04121F 100%);
  background-repeat: no-repeat;
  color: var(--white);
  font-family: var(--font-body);
  font-size: 16.5px;
  line-height: 1.75;
  letter-spacing: .005em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -.02em;
  color: var(--white);
  text-wrap: balance;
}
h1 { font-size: clamp(2.1rem, 4.6vw, 4rem); }
h2 { font-size: clamp(1.55rem, 2.9vw, 2.35rem); }
h3 { font-size: clamp(1.15rem, 1.7vw, 1.45rem); }
h4 { font-size: 1.02rem; letter-spacing: 0; }
p { text-wrap: pretty; }

strong, b { color: var(--white); font-weight: 700; }
small { font-size: 12.5px; }
::selection { background: rgba(63, 242, 208, .28); color: var(--white); }

:where(a, button, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
  border-radius: var(--radius);
}

/* ---------- 4. 通用容器与栅格 ---------- */
.container { width: var(--shell); margin-inline: auto; }

.section { padding-block: clamp(40px, 6vw, 88px); }
.section-head { display: grid; gap: 12px; margin-bottom: clamp(22px, 3vw, 40px); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--signal-dim);
}
.eyebrow::before {
  content: "";
  width: 24px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--signal-dim));
}

.mono-label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--signal-dim);
}

.rule {
  height: 1px;
  background: linear-gradient(90deg, var(--grid), rgba(63, 242, 208, .55) 32%, var(--grid) 100%);
  margin-block: clamp(26px, 4vw, 52px);
}

.grid { display: grid; gap: clamp(18px, 2.4vw, 32px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--asym { grid-template-columns: minmax(160px, 220px) minmax(0, 1fr); }

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  font-family: var(--font-body);
  font-size: 13.5px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: .02em;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color var(--dur) var(--ease),
              color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease);
}
.btn--signal {
  background: var(--signal);
  color: var(--ink);
  border-color: var(--signal);
}
.btn--signal:hover { background: #6ff8dd; border-color: #6ff8dd; box-shadow: 0 0 0 3px rgba(63, 242, 208, .16); }
.btn--ghost {
  background: transparent;
  color: var(--signal);
  border-color: rgba(63, 242, 208, .45);
}
.btn--ghost:hover { background: rgba(63, 242, 208, .10); border-color: var(--signal); color: var(--white); }
.btn--coral {
  background: var(--coral);
  color: var(--ink);
  border-color: var(--coral);
}
.btn--coral:hover { background: #ff9873; border-color: #ff9873; }
.btn--quiet {
  background: var(--hull);
  color: var(--white);
  border-color: var(--grid);
}
.btn--quiet:hover { border-color: var(--signal-dim); color: var(--signal); }

/* ---------- 6. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--signal);
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  border-radius: var(--radius);
  box-shadow: 0 10px 30px -14px rgba(0, 0, 0, .9);
  transform: translateY(-180%);
  transition: transform var(--dur) var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible { transform: translateY(0); }

/* ---------- 7. 头部命令栏 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: rgba(4, 18, 31, .82);
  border-bottom: 1px solid var(--grid);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  backdrop-filter: blur(16px) saturate(140%);
  transition: background-color 200ms var(--ease), box-shadow 200ms var(--ease);
}
.site-header[data-scrolled] {
  background: rgba(4, 18, 31, .97);
  box-shadow: 0 14px 34px -26px rgba(0, 0, 0, .95), 0 1px 0 rgba(63, 242, 208, .18);
}

.site-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  overflow: hidden;
  pointer-events: none;
}
.site-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, rgba(63, 242, 208, .30), var(--signal) 60%, var(--deep-cyan));
  transition: width 120ms linear;
}

.header-shell {
  width: var(--shell);
  margin-inline: auto;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
  padding-block: 10px;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--white);
  flex: none;
}
.brand__mark {
  position: relative;
  width: 30px;
  height: 30px;
  flex: none;
  background: linear-gradient(150deg, rgba(63, 242, 208, .22), rgba(4, 18, 31, 0) 72%);
  border: 1px solid var(--signal-dim);
  clip-path: polygon(0 0, 100% 0, 100% 68%, 68% 100%, 0 100%);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.brand__mark::before {
  content: "";
  position: absolute;
  left: 5px;
  bottom: 5px;
  width: 14px;
  height: 14px;
  border: 1px solid var(--signal);
  border-radius: 50%;
  border-color: transparent var(--signal) transparent transparent;
  transform: rotate(38deg);
}
.brand__mark::after {
  content: "";
  position: absolute;
  right: 6px;
  top: 6px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 8px rgba(255, 200, 87, .8);
}
.brand:hover .brand__mark {
  border-color: var(--signal);
  box-shadow: 0 0 0 1px rgba(63, 242, 208, .30), 0 0 18px -6px var(--signal);
}
.brand__text { display: grid; gap: 1px; }
.brand__name {
  font-family: var(--font-display);
  font-size: 16.5px;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--white);
}
.brand__tagline {
  font-family: var(--font-mono);
  font-size: 10px;
  line-height: 1.3;
  letter-spacing: .10em;
  color: var(--mist);
}
.brand--footer .brand__name { font-size: 18px; }

/* 移动端开关 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  padding: 9px 12px;
  background: var(--hull);
  border: 1px solid var(--grid);
  border-radius: var(--radius);
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.nav-toggle:hover { border-color: var(--signal-dim); color: var(--signal); }
.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 12px;
}
.nav-toggle__bars span {
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  border-radius: 1px;
  background: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease), top var(--dur) var(--ease);
}
.nav-toggle__bars span:nth-child(1) { top: 0; }
.nav-toggle__bars span:nth-child(2) { top: 5px; }
.nav-toggle__bars span:nth-child(3) { top: 10px; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) { top: 5px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) { top: 5px; transform: rotate(-45deg); }

/* 命令栏导航 */
.command-nav {
  display: flex;
  align-items: center;
  gap: clamp(8px, 1.4vw, 20px);
  margin-left: auto;
}
.command-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.command-nav__item { display: block; }
.command-nav__link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 9px 10px;
  color: var(--mist);
  font-size: 13.5px;
  line-height: 1.2;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius);
  transition: color var(--dur) var(--ease),
              background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}
.command-nav__index {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .04em;
  color: var(--signal-dim);
  transition: color var(--dur) var(--ease);
}
.command-nav__label { white-space: nowrap; }
.command-nav__link:hover {
  color: var(--white);
  background: rgba(63, 242, 208, .07);
  border-color: var(--grid);
}
.command-nav__link[aria-current="page"] {
  color: var(--white);
  background: rgba(63, 242, 208, .10);
  border-color: rgba(63, 242, 208, .42);
}
.command-nav__link[aria-current="page"] .command-nav__index { color: var(--signal); }
.command-nav__link[aria-current="page"]::after {
  content: "";
  align-self: center;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 8px var(--signal);
}
.command-nav__cta {
  padding: 9px 16px;
  font-size: 13px;
  white-space: nowrap;
}

/* ---------- 8. 面包屑 / 正文 / 展签 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .05em;
  color: var(--mist);
}
.breadcrumb a { color: var(--mist); text-decoration: none; transition: color var(--dur) var(--ease); }
.breadcrumb a:hover { color: var(--signal); }
.breadcrumb__sep { color: var(--grid); }
.breadcrumb__current { color: var(--white); }

.prose {
  max-width: 68ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--mist);
}
.prose h2, .prose h3, .prose h4 { color: var(--white); margin-block: 2.1em .6em; }
.prose p { margin-bottom: 1.1em; }
.prose ul, .prose ol { padding-left: 1.3em; margin-bottom: 1.2em; }
.prose li { margin-bottom: .42em; }
.prose a { color: var(--signal); }
.prose blockquote {
  margin: 1.6em 0;
  padding: 4px 0 4px 20px;
  border-left: 2px solid var(--signal-dim);
  color: var(--white);
}

.plate {
  position: relative;
  padding: 18px 20px;
  background: rgba(11, 44, 63, .55);
  border: 1px solid var(--grid);
  border-left: 2px solid var(--signal);
  border-radius: var(--radius);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.plate:hover { border-color: rgba(63, 242, 208, .45); border-left-color: var(--signal); background: rgba(11, 44, 63, .82); }
.plate__index {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--signal-dim);
  margin-bottom: 8px;
}

.ticket {
  position: relative;
  padding: 18px 20px 20px;
  background: linear-gradient(160deg, rgba(11, 44, 63, .95), rgba(7, 30, 46, .95));
  border: 1px solid var(--grid);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.ticket:hover { border-color: rgba(63, 242, 208, .5); box-shadow: inset 0 0 0 1px rgba(63, 242, 208, .18); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  line-height: 1.6;
  border: 1px solid var(--grid);
  border-radius: var(--radius);
  color: var(--mist);
  background: rgba(11, 44, 63, .6);
}
.tag--signal { color: var(--signal); border-color: rgba(63, 242, 208, .45); background: rgba(63, 242, 208, .10); }
.tag--coral { color: var(--coral); border-color: rgba(255, 122, 77, .45); background: rgba(255, 122, 77, .10); }
.tag--amber { color: var(--amber); border-color: rgba(255, 200, 87, .45); background: rgba(255, 200, 87, .10); }

/* ---------- 9. 图片容器基础规则 ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  isolation: isolate;
  background:
    radial-gradient(120% 90% at 18% 0%, rgba(63, 242, 208, .16), transparent 62%),
    linear-gradient(160deg, var(--hull), var(--trench) 72%, var(--abyss));
  border: 1px solid var(--grid);
  border-radius: var(--radius);
}
.media > img,
.media > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.92) contrast(1.06) brightness(.94);
}
.media__frame {
  position: absolute;
  inset: 0;
  pointer-events: none;
  border: 1px solid rgba(63, 242, 208, .16);
  background: linear-gradient(180deg, transparent 55%, rgba(4, 18, 31, .55));
}
.media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--mist);
}
.media__note {
  position: absolute;
  left: 14px;
  top: 14px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .14em;
  color: var(--signal);
  opacity: .8;
}
.media--21x9 { aspect-ratio: 21 / 9; }
.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--portrait { aspect-ratio: 3 / 4; }

/* ---------- 10. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 8vw, 110px);
  border-top: 1px solid var(--grid);
  background-image:
    radial-gradient(760px 360px at 10% 0%, rgba(63, 242, 208, .07), transparent 70%),
    radial-gradient(620px 320px at 92% 12%, rgba(255, 122, 77, .06), transparent 72%),
    linear-gradient(180deg, rgba(7, 30, 46, .70) 0%, var(--abyss) 100%);
}
.footer-shell {
  width: var(--shell);
  margin-inline: auto;
  padding-block: clamp(38px, 5.5vw, 72px) clamp(26px, 4vw, 52px);
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1.55fr) minmax(0, .9fr);
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

.footer-brand { display: grid; gap: 16px; }
.footer-brand__summary {
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}
.footer-brand__meta {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mist);
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(16px, 2.4vw, 32px);
}
.footer-col { min-width: 0; }
.footer-col__title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--signal-dim);
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(30, 70, 87, .8);
}
.footer-col__list { display: grid; gap: 9px; list-style: none; margin: 0; padding: 0; }
.footer-col__link {
  display: inline-block;
  font-size: 14px;
  line-height: 1.6;
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.footer-col__link:hover { color: var(--signal); border-bottom-color: var(--signal-dim); }

.footer-contact { display: grid; gap: 0; min-width: 0; }
.contact-row {
  display: grid;
  gap: 2px;
  padding-block: 10px;
  border-bottom: 1px dashed rgba(30, 70, 87, .75);
}
.contact-row:last-of-type { border-bottom: 0; }
.contact-row__label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--signal-dim);
}
.contact-row__value {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--white);
  overflow-wrap: anywhere;
}
.footer-contact__note {
  margin-top: 12px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}
.copy-btn {
  flex: none;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .08em;
  color: var(--mist);
  background: transparent;
  border: 1px solid var(--grid);
  border-radius: var(--radius);
  cursor: pointer;
  transition: color var(--dur) var(--ease),
              background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}
.copy-btn:hover { color: var(--signal); border-color: var(--signal-dim); background: rgba(63, 242, 208, .08); }
.copy-btn[data-copied] {
  color: var(--ink);
  background: var(--signal);
  border-color: var(--signal);
}

.footer-legal { border-top: 1px solid var(--grid); }
.footer-legal__inner {
  width: var(--shell);
  margin-inline: auto;
  padding-block: 16px 26px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 26px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .04em;
  color: var(--mist);
}
.footer-legal__copy { margin: 0; }
.footer-legal__links { display: flex; flex-wrap: wrap; gap: 18px; margin: 0; }
.footer-legal__link {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.footer-legal__link:hover { color: var(--signal); border-bottom-color: var(--signal-dim); }
.footer-legal__icp { margin: 0; color: var(--signal-dim); }

/* ---------- 11. 工具类 ---------- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- 12. 响应式 ---------- */
@media (max-width: 1180px) {
  .command-nav__link { padding: 9px 8px; font-size: 13px; }
  .brand__tagline { display: none; }
}

@media (max-width: 980px) {
  :root { --header-h: 64px; }

  .nav-toggle { display: inline-flex; }
  .command-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: grid;
    gap: 4px;
    margin: 0;
    padding: 12px var(--pad) 22px;
    background: #051826;
    border-bottom: 1px solid var(--grid);
    box-shadow: 0 28px 46px -32px #000;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity var(--dur) var(--ease),
                transform var(--dur) var(--ease),
                visibility var(--dur) var(--ease);
  }
  .command-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  .command-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }
  .command-nav__link {
    width: 100%;
    padding: 12px 10px;
    font-size: 15px;
    border-bottom: 1px solid rgba(30, 70, 87, .55);
  }
  .command-nav__index { font-size: 11px; }
  .command-nav__cta {
    margin-top: 12px;
    padding-block: 13px;
    width: 100%;
  }

  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--asym { grid-template-columns: minmax(0, 1fr); }

  .footer-shell {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
  .footer-contact { grid-column: 1 / -1; }
  .footer-brand__summary { max-width: none; }
}

@media (max-width: 700px) {
  body { font-size: 16px; }
  .grid--2, .grid--3 { grid-template-columns: minmax(0, 1fr); }
  .footer-shell { grid-template-columns: minmax(0, 1fr); gap: 30px; }
  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px 18px; }
  .footer-contact { grid-column: auto; }
  .footer-legal__inner { flex-direction: column; align-items: flex-start; gap: 8px; }
  .media--21x9, .media--16x9 { aspect-ratio: 4 / 3; }
}

@media (max-width: 400px) {
  .nav-toggle__label { display: none; }
  .footer-nav { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 13. 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  .skip-link { transition: none; }
  .command-nav { transform: none !important; }
}