/* ===========================================================
   乐鱼赛场 /assets/site.css
   共享外壳：reset、设计令牌、中文排版、头部、页脚、通用组件
   =========================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body { margin: 0; }

h1, h2, h3, h4, h5, h6, p, figure, blockquote { margin: 0; }

ul, ol { margin: 0; padding: 0; list-style: none; }

img, svg, video { display: block; max-width: 100%; }

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

a { color: inherit; }

table { border-collapse: collapse; width: 100%; }

/* ---------- 2. 设计令牌 ---------- */
:root {
  --ink: #061C2E;
  --sea: #0B3A5A;
  --cyan: #17D7D0;
  --teal: #0A6B69;
  --coral: #FF6B4A;
  --amber: #E9A93A;
  --cream: #F6F1E6;
  --paper: #E8E0CF;
  --mist: #D6F2EE;
  --grid: #A8BAC6;

  --ink-86: rgba(6, 28, 46, .86);
  --ink-70: rgba(6, 28, 46, .70);
  --ink-55: rgba(6, 28, 46, .55);
  --on-dark: rgba(246, 241, 230, .82);
  --on-dark-dim: rgba(246, 241, 230, .56);
  --line: rgba(6, 28, 46, .14);
  --line-strong: rgba(6, 28, 46, .28);

  --font-display: 'Barlow Condensed', 'Noto Sans SC', 'Source Han Sans SC', system-ui, sans-serif;
  --font-body: 'Noto Sans SC', 'Source Han Sans SC', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --font-index: 'Barlow', 'Noto Sans SC', system-ui, sans-serif;

  --fs-12: 12px;
  --fs-14: 14px;
  --fs-16: 16px;
  --fs-20: 20px;
  --fs-28: 28px;
  --fs-44: 44px;
  --fs-72: 72px;
  --fs-112: 112px;

  --container: 1280px;
  --gutter: clamp(16px, 4vw, 40px);
  --ease: cubic-bezier(.22, .61, .36, 1);
  --dur-enter: 420ms;
  --radius: 3px;
}

/* ---------- 3. 基础排版 ---------- */
body {
  font-family: var(--font-body);
  font-size: var(--fs-16);
  line-height: 1.75;
  color: var(--ink);
  background-color: var(--cream);
  background-image:
    radial-gradient(62vw 40vw at 6% -6%, rgba(23, 215, 208, .20), transparent 62%),
    radial-gradient(54vw 38vw at 104% 0%, rgba(11, 58, 90, .16), transparent 60%);
  background-repeat: no-repeat;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: .01em;
  color: var(--ink);
}

h1 { font-size: clamp(40px, 7vw, var(--fs-112)); }
h2 { font-size: clamp(28px, 4.2vw, var(--fs-44)); }
h3 { font-size: clamp(20px, 2.4vw, var(--fs-28)); }
h4 { font-size: var(--fs-20); }

p {
  font-size: var(--fs-16);
  line-height: 1.75;
  max-width: 42em;
}

strong { font-weight: 700; }

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

.site-header :focus-visible,
.site-footer :focus-visible {
  outline-color: var(--cyan);
}

/* 字段名 / 数值的全局对照规则 */
.meta-key {
  font-family: var(--font-index);
  font-size: var(--fs-12);
  font-weight: 500;
  letter-spacing: .16em;
  color: var(--grid);
}

.meta-val {
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
  color: var(--ink);
}

/* ---------- 4. 通用容器与章节头 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.section { padding: clamp(48px, 7vw, 96px) 0; }

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px 18px;
  padding-bottom: 16px;
  margin-bottom: 28px;
  border-bottom: 2px solid var(--ink);
}

.section__num {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: .12em;
  color: var(--sea);
  border: 1px solid var(--grid);
  border-radius: 2px;
  padding: 2px 8px;
  background: var(--mist);
}

.section__label {
  font-family: var(--font-index);
  font-size: var(--fs-12);
  font-weight: 500;
  letter-spacing: .22em;
  color: var(--teal);
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  padding: 2px 10px;
}

.section__lead {
  flex: 1 1 320px;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--ink-70);
  max-width: 44em;
}

.eyebrow {
  font-family: var(--font-index);
  font-size: var(--fs-12);
  font-weight: 500;
  letter-spacing: .22em;
  color: var(--teal);
}

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-index);
  font-size: var(--fs-14);
  font-weight: 600;
  letter-spacing: .08em;
  line-height: 1;
  padding: 11px 18px;
  border: 1px solid transparent;
  border-radius: 2px;
  text-decoration: none;
  cursor: pointer;
  transition: background-color .22s var(--ease), color .22s var(--ease),
              border-color .22s var(--ease), transform .22s var(--ease);
}

.btn--primary {
  background-color: var(--coral);
  color: var(--ink);
  border-color: var(--coral);
}

.btn--primary:hover {
  background-color: #ff8163;
  border-color: #ff8163;
  transform: translateY(-1px);
}

.btn--ghost {
  background-color: transparent;
  color: var(--sea);
  border-color: var(--line-strong);
}

.btn--ghost:hover {
  background-color: var(--ink);
  color: var(--cream);
  border-color: var(--ink);
}

/* ---------- 6. 头部：双层刊头 + 栏目条 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
}

.skip-link {
  position: absolute;
  top: -72px;
  left: 16px;
  z-index: 120;
  background-color: var(--ink);
  color: var(--cream);
  border: 1px solid var(--cyan);
  border-radius: 2px;
  padding: 10px 16px;
  font-family: var(--font-index);
  font-size: var(--fs-14);
  letter-spacing: .08em;
  text-decoration: none;
  transition: top .18s var(--ease);
}

.skip-link:focus { top: 12px; }

/* 上层刊头 */
.masthead {
  background-color: var(--ink);
  background-image:
    linear-gradient(90deg, rgba(23, 215, 208, .16) 0 1px, transparent 1px 46px),
    radial-gradient(760px 240px at 86% 0%, rgba(23, 215, 208, .18), transparent 70%);
  color: var(--cream);
  overflow: hidden;
  max-height: 220px;
  border-bottom: 1px solid rgba(23, 215, 208, .28);
  transition: max-height .42s var(--ease), opacity .3s var(--ease), border-color .3s var(--ease);
}

.masthead__inner {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 16px var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--cream);
}

.brand__mark {
  width: 40px;
  height: 40px;
  flex: none;
  display: grid;
  place-items: center;
  border: 1px solid rgba(23, 215, 208, .55);
  border-radius: var(--radius);
  background-image: linear-gradient(150deg, rgba(23, 215, 208, .22), rgba(11, 58, 90, .12));
}

.brand__wave {
  width: 20px;
  height: 12px;
  border-radius: 2px;
  background-image: repeating-linear-gradient(180deg, var(--cyan) 0 2px, transparent 2px 4px);
  transform: skewY(-6deg);
  opacity: .92;
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.brand__name {
  font-family: var(--font-display);
  font-size: var(--fs-20);
  font-weight: 700;
  letter-spacing: .1em;
  line-height: 1.1;
  color: var(--cream);
}

.brand__tag {
  font-family: var(--font-index);
  font-size: var(--fs-12);
  font-weight: 500;
  letter-spacing: .08em;
  line-height: 1.4;
  color: var(--on-dark-dim);
}

.masthead__aside {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.masthead__meta {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 6px 10px;
  border: 1px dashed rgba(23, 215, 208, .45);
  border-radius: 2px;
  max-width: none;
}

.masthead__meta .meta-key { color: var(--on-dark-dim); }
.masthead__meta .meta-val { color: var(--cyan); }

/* 下层栏目条 */
.navband {
  position: relative;
  background-color: var(--cream);
  border-bottom: 1px solid var(--ink);
}

.navband__inner {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
  min-height: 58px;
  display: flex;
  align-items: center;
  gap: 12px;
  transition: min-height .32s var(--ease);
}

.navband__brand {
  display: none;
  font-family: var(--font-display);
  font-size: var(--fs-16);
  font-weight: 700;
  letter-spacing: .12em;
  text-decoration: none;
  color: var(--ink);
  white-space: nowrap;
}

.navband__nav { min-width: 0; }

.nav-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 2px;
}

.nav-list__item { display: block; }

.nav-link {
  display: inline-block;
  padding: 10px 12px;
  font-size: var(--fs-14);
  line-height: 1.2;
  color: var(--sea);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color .2s var(--ease), background-color .2s var(--ease), border-color .2s var(--ease);
}

.nav-link:hover {
  color: var(--ink);
  background-color: rgba(23, 215, 208, .16);
}

.nav-link[aria-current="page"] {
  color: var(--ink);
  font-weight: 500;
  border-bottom-color: var(--cyan);
}

.navband__cta {
  margin-left: auto;
  padding: 9px 16px;
  white-space: nowrap;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  background-color: var(--ink);
  color: var(--cream);
  border-radius: 2px;
}

.nav-toggle__bars {
  width: 18px;
  height: 12px;
  background-image: repeating-linear-gradient(180deg, currentColor 0 2px, transparent 2px 5px);
}

.nav-toggle__label {
  font-family: var(--font-index);
  font-size: var(--fs-12);
  font-weight: 500;
  letter-spacing: .16em;
}

.navband__progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background-color: rgba(11, 58, 90, .12);
  overflow: hidden;
}

.navband__progress-bar {
  display: block;
  width: 0;
  height: 100%;
  background-image: linear-gradient(90deg, var(--cyan), var(--coral));
  transition: width .12s linear;
}

/* 紧凑态：刊头收起、品牌名出现 */
.site-header--condensed .masthead {
  max-height: 0;
  opacity: 0;
  border-bottom-width: 0;
}

.site-header--condensed .navband__inner { min-height: 52px; }

@media (min-width: 901px) {
  .site-header--condensed .navband__brand { display: inline-flex; }
}

/* ---------- 7. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: 0;
  background-color: var(--ink);
  background-image:
    linear-gradient(0deg, rgba(11, 58, 90, .55), rgba(11, 58, 90, 0) 60%),
    linear-gradient(90deg, rgba(23, 215, 208, .10) 0 1px, transparent 1px 52px);
  color: var(--on-dark);
}

.site-footer::before {
  content: "";
  display: block;
  height: 4px;
  background-image: linear-gradient(90deg, var(--cyan) 0%, var(--sea) 42%, var(--coral) 100%);
}

.footer-rail {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 14px var(--gutter);
  display: flex;
  justify-content: flex-end;
  border-bottom: 1px solid rgba(246, 241, 230, .14);
}

.footer-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-index);
  font-size: var(--fs-12);
  font-weight: 500;
  letter-spacing: .14em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px dashed rgba(23, 215, 208, .5);
  padding-bottom: 2px;
}

.footer-rail__link:hover { color: var(--cream); border-bottom-color: var(--cream); }

.footer-rail__arrow {
  display: inline-block;
  transition: transform .22s var(--ease);
}

.footer-rail__link:hover .footer-rail__arrow { transform: translate(2px, -2px); }

.footer-grid {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 52px var(--gutter) 40px;
  display: grid;
  grid-template-columns: 1.4fr .8fr .8fr 1.2fr;
  gap: 36px 40px;
}

.footer-brand__name {
  font-family: var(--font-display);
  font-size: var(--fs-28);
  font-weight: 700;
  letter-spacing: .1em;
  line-height: 1.1;
  color: var(--cream);
}

.footer-brand__line {
  margin-top: 10px;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--on-dark);
  max-width: 24em;
}

.footer-meta {
  margin-top: 20px;
  display: grid;
  gap: 8px;
}

.footer-meta li {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
}

.footer-meta .meta-val { color: var(--cream); font-size: var(--fs-12); }

.footer-col__title {
  font-family: var(--font-index);
  font-size: var(--fs-12);
  font-weight: 500;
  letter-spacing: .2em;
  color: var(--cyan);
  padding-bottom: 10px;
  margin-bottom: 14px;
  border-bottom: 1px solid rgba(246, 241, 230, .16);
}

.footer-links { display: grid; gap: 10px; }

.footer-links__item { display: block; }

.footer-links a {
  display: inline-block;
  font-size: var(--fs-14);
  line-height: 1.5;
  color: var(--on-dark);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.footer-links a:hover {
  color: var(--cream);
  border-bottom-color: var(--cyan);
}

.contact-list { display: grid; gap: 14px; }

.contact-item { display: grid; gap: 4px; }

.contact-item__key {
  font-family: var(--font-index);
  font-size: var(--fs-12);
  font-weight: 500;
  letter-spacing: .16em;
  color: var(--grid);
}

.contact-item__val {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 500;
  line-height: 1.6;
  color: var(--cream);
  word-break: break-all;
}

.copy-btn {
  font-family: var(--font-index);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .12em;
  line-height: 1;
  padding: 4px 8px;
  color: var(--cyan);
  background-color: transparent;
  border: 1px solid rgba(23, 215, 208, .45);
  border-radius: 2px;
  transition: background-color .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}

.copy-btn:hover {
  background-color: rgba(23, 215, 208, .16);
  color: var(--cream);
}

.copy-btn.is-copied {
  background-color: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
}

.footer-note {
  margin-top: 18px;
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--on-dark-dim);
  max-width: 30em;
}

.footer-bottom {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 18px var(--gutter) 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px 24px;
  border-top: 1px solid rgba(246, 241, 230, .14);
}

.footer-legal {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 500;
  letter-spacing: .06em;
  color: var(--on-dark-dim);
  max-width: none;
}

.footer-credit {
  font-size: var(--fs-12);
  color: var(--on-dark-dim);
  max-width: none;
}

/* ---------- 8. 通用内容组件 ---------- */
.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
}

.grid--3-6-3 { grid-template-columns: 3fr 6fr 3fr; }
.grid--5-4-3 { grid-template-columns: 5fr 4fr 3fr; }
.grid--7-5   { grid-template-columns: 7fr 5fr; }
.grid--auto  { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 18px 20px;
  background-color: var(--paper);
  border: 1px solid var(--line);
  border-top: 3px solid var(--sea);
  border-radius: 2px;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease);
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 0 -6px rgba(6, 28, 46, .18);
}

.card--coral { border-top-color: var(--coral); }
.card--cyan  { border-top-color: var(--cyan); }

.card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.card__title {
  font-family: var(--font-display);
  font-size: var(--fs-20);
  font-weight: 700;
  line-height: 1.2;
  color: var(--ink);
}

.card__meta {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  letter-spacing: .04em;
  color: var(--sea);
}

.card__body {
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--ink-70);
  max-width: 38em;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-index);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .16em;
  line-height: 1;
  padding: 4px 8px;
  border: 1px solid var(--grid);
  border-radius: 2px;
  color: var(--sea);
  background-color: transparent;
}

.tag--coral { border-color: var(--coral); color: var(--coral); background-color: rgba(255, 107, 74, .10); }
.tag--amber { border-color: var(--amber); color: var(--ink); background-color: rgba(233, 169, 58, .20); }
.tag--cyan  { border-color: var(--cyan);  color: var(--teal); background-color: rgba(23, 215, 208, .16); }

.field {
  display: grid;
  grid-template-columns: minmax(96px, auto) 1fr;
  align-items: baseline;
  gap: 4px 14px;
  padding: 8px 10px;
  border-bottom: 1px solid var(--line);
}

.field__name {
  font-family: var(--font-body);
  font-size: var(--fs-12);
  font-weight: 500;
  letter-spacing: .08em;
  color: var(--grid);
}

.field__value {
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}

.field__hint {
  grid-column: 1 / -1;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  padding-left: 10px;
  border-left: 2px solid var(--cyan);
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--teal);
  transition: max-height .26s var(--ease), opacity .26s var(--ease), margin-top .26s var(--ease);
}

.field:hover .field__hint,
.field:focus-within .field__hint {
  max-height: 120px;
  opacity: 1;
  margin-top: 6px;
}

.media { margin: 0; }

.media__frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 2px;
  background-color: var(--sea);
  background-image: linear-gradient(135deg, rgba(11, 58, 90, .96), rgba(6, 28, 46, .98));
}

.media__frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .7;
  background-image:
    repeating-linear-gradient(90deg, rgba(23, 215, 208, .16) 0 1px, transparent 1px 32px),
    repeating-linear-gradient(0deg, rgba(23, 215, 208, .12) 0 1px, transparent 1px 32px);
}

.media__frame img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media__caption {
  margin-top: 10px;
  font-family: var(--font-index);
  font-size: var(--fs-12);
  letter-spacing: .08em;
  line-height: 1.6;
  color: var(--ink-55);
}

.media--wide   .media__frame { aspect-ratio: 21 / 9; }
.media--square .media__frame { aspect-ratio: 1 / 1; }
.media--tall   .media__frame { aspect-ratio: 3 / 4; }

.prose {
  max-width: 42em;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: var(--ink-86);
}

.prose p { margin-bottom: 1.1em; }

.prose h3 { margin: 1.6em 0 .6em; }

.prose a {
  color: var(--teal);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.prose ul { display: grid; gap: .5em; margin-bottom: 1.1em; padding-left: 1.2em; list-style: square; }

.breadcrumb {
  padding-top: 18px;
  font-family: var(--font-index);
  font-size: var(--fs-12);
  letter-spacing: .08em;
  color: var(--ink-55);
}

.breadcrumb__list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.breadcrumb__item { display: inline-flex; align-items: center; gap: 8px; }

.breadcrumb__item a {
  color: var(--teal);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.breadcrumb__item a:hover { border-bottom-color: var(--teal); }

.breadcrumb__sep { color: var(--grid); }

.breadcrumb__current { color: var(--ink); font-weight: 500; }

/* ---------- 9. 显现动效 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--dur-enter) var(--ease), transform var(--dur-enter) var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}

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

/* ---------- 10. 响应式 ---------- */
@media (max-width: 1080px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  .masthead__inner { padding: 12px var(--gutter); }
  .brand__tag { display: none; }
  .masthead__meta { display: none; }

  .navband__brand { display: inline-flex; }

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

  .navband__inner { min-height: 54px; }

  .navband__nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
    padding: 6px var(--gutter) 18px;
    background-color: var(--ink);
    background-image: linear-gradient(90deg, rgba(23, 215, 208, .12) 0 1px, transparent 1px 46px);
    border-bottom: 1px solid var(--cyan);
    box-shadow: 0 18px 28px -18px rgba(6, 28, 46, .7);
  }

  .site-header[data-open] .navband__nav { display: block; }

  .nav-list { flex-direction: column; gap: 0; }

  .nav-link {
    display: block;
    padding: 14px 4px;
    font-size: var(--fs-16);
    color: var(--on-dark);
    border-bottom: 1px solid rgba(246, 241, 230, .12);
  }

  .nav-link:hover { background-color: rgba(23, 215, 208, .14); color: var(--cyan); }

  .nav-link[aria-current="page"] {
    color: var(--cyan);
    border-bottom-color: var(--cyan);
  }

  .navband__cta { padding: 8px 12px; font-size: var(--fs-12); }

  .grid--3-6-3,
  .grid--5-4-3,
  .grid--7-5 { grid-template-columns: 1fr; }

  .section__head { gap: 10px 14px; }
}

@media (max-width: 640px) {
  body { font-size: var(--fs-14); }

  h1 { font-size: clamp(32px, 10vw, 56px); }
  h2 { font-size: clamp(24px, 7vw, 34px); }

  .footer-grid { grid-template-columns: 1fr; padding-top: 40px; gap: 30px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .footer-rail { justify-content: flex-start; }
  .field { grid-template-columns: 1fr; }
}

/* ---------- 11. 降低动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }

  [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }

  .card:hover { transform: none; }
  .skip-link { transition: none; }
}