/* ==========================================================================
   乐鱼体育 · 共享外壳样式  /assets/site.css
   ========================================================================== */

:root {
  --sea-deep: #071A2B;
  --sea-layer: #0E2537;
  --aqua: #23B5E0;
  --aqua-soft: #7FD8F0;
  --coral: #FF6A45;
  --coral-soft: #FFA070;
  --lime: #B8F24A;
  --paper: #F2F6F8;
  --muted: #8AA2B4;
  --slate: #2C4257;

  --text-body: #D5E2EC;
  --text-dim: #94AAB9;

  --font-sans: "PingFang SC", "HarmonyOS Sans SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC",
    system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", Menlo,
    Consolas, "Liberation Mono", "Courier New", monospace;

  --header-h: 78px;
  --shell-max: 1320px;
  --shell-pad: 40px;

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 22px;
  --radius-pill: 999px;

  --ease-out: cubic-bezier(.22, .72, .28, 1);
  --ease-soft: cubic-bezier(.4, 0, .2, 1);

  --line-soft: rgba(44, 66, 87, .72);
  --line-strong: rgba(44, 66, 87, .95);
}

/* ---------------------------------------------------------------- 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) + 16px);
}

body {
  margin: 0;
  min-height: 100%;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-body);
  background-color: var(--sea-deep);
  background-image:
    radial-gradient(1180px 720px at 88% -12%, rgba(35, 181, 224, .16), transparent 62%),
    radial-gradient(880px 620px at -8% 28%, rgba(255, 106, 69, .11), transparent 60%),
    radial-gradient(700px 520px at 60% 108%, rgba(184, 242, 74, .07), transparent 66%);
  background-attachment: fixed;
  overflow-x: hidden;
}

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

ul, ol { margin: 0; padding: 0; }

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

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

a {
  color: var(--aqua-soft);
  text-decoration-color: rgba(127, 216, 240, .45);
  text-underline-offset: 3px;
}

a:hover { color: var(--paper); }

:focus-visible {
  outline: 3px solid var(--lime);
  outline-offset: 2px;
  border-radius: 4px;
}

::selection {
  background: rgba(35, 181, 224, .38);
  color: #FFFFFF;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* --------------------------------------------------------------- 跳转 */

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: .62em 1.05em;
  font-size: .875rem;
  font-weight: 800;
  letter-spacing: .04em;
  color: #14240A;
  background: var(--lime);
  border-radius: var(--radius-sm);
  text-decoration: none;
  transform: translateY(-190%);
  transition: transform .22s var(--ease-out);
}

.skip-link:focus { transform: translateY(0); color: #14240A; }

/* -------------------------------------------------------------- 容器 */

.container,
.header-shell,
.footer-shell {
  width: min(100% - (var(--shell-pad) * 2), var(--shell-max));
  margin-inline: auto;
}

main { padding-top: var(--header-h); }

/* ------------------------------------------------------------ 排版基调 */

h1, h2, h3 {
  color: var(--paper);
  font-weight: 850;
  letter-spacing: -.015em;
  line-height: 1.14;
}

.prose {
  max-width: 68ch;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--text-body);
}

.prose > * + * { margin-top: 1.15em; }

.prose h2 {
  font-size: clamp(1.4rem, 2.4vw, 1.85rem);
  margin-top: 2em;
}

.prose h3 {
  font-size: clamp(1.15rem, 1.8vw, 1.35rem);
  margin-top: 1.7em;
  color: var(--aqua-soft);
}

.prose a { font-weight: 600; }

.prose strong { color: var(--paper); font-weight: 750; }

.prose ul, .prose ol { padding-left: 1.35em; }
.prose li + li { margin-top: .4em; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .6em;
  font-size: .75rem;
  font-weight: 800;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--aqua-soft);
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 2px;
  background: linear-gradient(90deg, var(--aqua), rgba(35, 181, 224, 0));
}

.eyebrow--coral { color: var(--coral-soft); }
.eyebrow--coral::before { background: linear-gradient(90deg, var(--coral), rgba(255, 106, 69, 0)); }

.section { padding-block: clamp(48px, 7vw, 92px); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: clamp(24px, 3.4vw, 42px);
}

.section-head h2 {
  font-size: clamp(1.6rem, 3.4vw, 2.6rem);
  max-width: 22ch;
}

.divider-diagonal {
  height: 1px;
  border: 0;
  margin: 0;
  background: linear-gradient(90deg, transparent, var(--slate) 16%, var(--slate) 84%, transparent);
  transform: skewY(-1.1deg);
  transform-origin: left center;
}

/* -------------------------------------------------------------- 网格 */

.grid { display: grid; gap: var(--gap, 20px); }

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gap, 20px);
}

.grid--gap-lg { --gap: 32px; }

@media (max-width: 900px) {
  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
}

@media (max-width: 600px) {
  .grid-12 { grid-template-columns: minmax(0, 1fr); }
}

/* -------------------------------------------------------------- 按钮 */

.btn {
  --btn-fg: var(--paper);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .55em;
  padding: .74em 1.35em;
  font-family: var(--font-sans);
  font-size: .9375rem;
  font-weight: 800;
  letter-spacing: .03em;
  line-height: 1.2;
  color: var(--btn-fg);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
  transition: transform .22s var(--ease-out), background-color .22s var(--ease-soft),
    border-color .22s var(--ease-soft), color .22s var(--ease-soft), box-shadow .22s var(--ease-soft);
}

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

.btn-primary {
  color: #26100A;
  background: linear-gradient(135deg, var(--coral) 0%, #F2522B 100%);
  box-shadow: 0 14px 30px -18px rgba(255, 106, 69, .95);
}

.btn-primary:hover {
  color: #1D0B06;
  box-shadow: 0 18px 34px -16px rgba(255, 106, 69, .95);
}

.btn-ghost {
  color: var(--aqua-soft);
  background: rgba(35, 181, 224, .09);
  border-color: rgba(35, 181, 224, .4);
}

.btn-ghost:hover {
  color: #E4F8FF;
  background: rgba(35, 181, 224, .18);
  border-color: var(--aqua);
}

.btn-quiet {
  color: var(--muted);
  border-color: var(--line-soft);
  background: rgba(14, 37, 55, .6);
}

.btn-quiet:hover {
  color: var(--paper);
  border-color: var(--aqua-soft);
}

/* -------------------------------------------------------------- 标签 */

.tag {
  display: inline-flex;
  align-items: center;
  gap: .45em;
  padding: .32em .78em;
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .08em;
  border-radius: var(--radius-pill);
  color: var(--aqua-soft);
  background: rgba(35, 181, 224, .12);
  border: 1px solid rgba(35, 181, 224, .32);
  white-space: nowrap;
}

.tag--coral {
  color: var(--coral-soft);
  background: rgba(255, 106, 69, .14);
  border-color: rgba(255, 106, 69, .36);
}

.tag--lime {
  color: var(--lime);
  background: rgba(184, 242, 74, .13);
  border-color: rgba(184, 242, 74, .38);
}

.tag--lime::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 3px rgba(184, 242, 74, .2);
}

/* -------------------------------------------------------------- 卡片 */

.card {
  position: relative;
  padding: clamp(18px, 2.2vw, 26px);
  background: linear-gradient(168deg, rgba(14, 37, 55, .94), rgba(9, 26, 42, .82));
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.card--cut {
  border-radius: var(--radius-sm);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), calc(100% - 30px) 100%, 0 100%);
}

.card--accent {
  border-color: rgba(35, 181, 224, .34);
  box-shadow: inset 0 1px 0 rgba(127, 216, 240, .16);
}

.card--accent::after {
  content: "";
  position: absolute;
  inset-block-start: 0;
  inset-inline-start: 0;
  width: 58px;
  height: 3px;
  background: linear-gradient(90deg, var(--aqua), var(--lime));
}

/* -------------------------------------------------------------- 数据 */

.stat {
  display: flex;
  flex-direction: column;
  gap: .3rem;
}

.stat-value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(1.5rem, 3vw, 2.35rem);
  line-height: 1.05;
  letter-spacing: -.02em;
  color: var(--paper);
}

.stat-value--coral { color: var(--coral); }
.stat-value--lime { color: var(--lime); }
.stat-value--aqua { color: var(--aqua-soft); }

.stat-label {
  font-size: .8125rem;
  letter-spacing: .06em;
  color: var(--muted);
}

/* ------------------------------------------------------------ 图片位 */

.media-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-soft);
  background-color: var(--sea-layer);
  background-image:
    linear-gradient(142deg, rgba(35, 181, 224, .26), rgba(7, 26, 43, .1) 46%, rgba(255, 106, 69, .2)),
    repeating-linear-gradient(135deg, rgba(127, 216, 240, .07) 0 2px, transparent 2px 15px);
  isolation: isolate;
}

.media-frame > img,
.media-frame > video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--3x2 { aspect-ratio: 3 / 2; }
.media-frame--4x3 { aspect-ratio: 4 / 3; }
.media-frame--1x1 { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--wide { aspect-ratio: 21 / 9; }

.media-frame--cut {
  border-radius: 0;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 34px), calc(100% - 34px) 100%, 0 100%);
}

.media-frame__caption {
  position: absolute;
  inset-inline: 0;
  inset-block-end: 0;
  padding: 14px 18px;
  font-size: .8125rem;
  letter-spacing: .05em;
  color: var(--paper);
  background: linear-gradient(0deg, rgba(7, 26, 43, .92), rgba(7, 26, 43, 0));
}

/* ------------------------------------------------------------ 面包屑 */

.breadcrumb {
  padding-block: 22px 0;
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .55em;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: .8125rem;
  letter-spacing: .04em;
  color: var(--muted);
}

.breadcrumb-list li { display: inline-flex; align-items: center; gap: .55em; }

.breadcrumb-list li + li::before {
  content: "/";
  color: var(--slate);
}

.breadcrumb-list a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 600;
  transition: color .2s var(--ease-soft);
}

.breadcrumb-list a:hover { color: var(--aqua-soft); }

.breadcrumb-list [aria-current="page"] { color: var(--paper); font-weight: 700; }

/* ============================================================== HEADER */

.site-header {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: 80;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color .3s var(--ease-soft), border-color .3s var(--ease-soft),
    backdrop-filter .3s var(--ease-soft), box-shadow .3s var(--ease-soft);
}

.site-header.is-scrolled {
  background: rgba(8, 24, 39, .9);
  border-bottom-color: var(--line-soft);
  box-shadow: 0 18px 40px -32px rgba(0, 0, 0, .95);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  backdrop-filter: blur(16px) saturate(150%);
}

.header-shell {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.4vw, 34px);
  min-height: var(--header-h);
}

/* 品牌 ------------------------------------------------------------- */

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  text-decoration: none;
  color: var(--paper);
  flex: 0 0 auto;
}

.brand:hover { color: var(--paper); }

.brand-mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: .8125rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: #04202F;
  background: linear-gradient(150deg, var(--aqua-soft), var(--aqua) 55%, #1189B2);
  border-radius: 13px 13px 13px 4px;
  box-shadow: 0 10px 24px -16px rgba(35, 181, 224, .95);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-name {
  font-size: 1.0625rem;
  font-weight: 850;
  letter-spacing: .01em;
  color: var(--paper);
}

.brand-sub {
  font-size: .6875rem;
  font-weight: 600;
  letter-spacing: .14em;
  color: var(--muted);
  margin-top: 3px;
}

/* 主导航 ----------------------------------------------------------- */

.primary-nav {
  margin-inline-start: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.7vw, 26px);
  list-style: none;
}

.nav-list a {
  position: relative;
  display: inline-block;
  padding: 9px 2px;
  font-size: .9375rem;
  font-weight: 650;
  letter-spacing: .02em;
  color: #B7CAD8;
  text-decoration: none;
  transition: color .2s var(--ease-soft);
}

.nav-list a::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  inset-block-end: 0;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--aqua), var(--lime));
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform .26s var(--ease-out);
}

.nav-list a:hover { color: var(--paper); }
.nav-list a:hover::after { transform: scaleX(1); }

.nav-list a[aria-current="page"] { color: var(--paper); font-weight: 800; }
.nav-list a[aria-current="page"]::after { transform: scaleX(1); }

.nav-utility { display: none; }

.nav-utility-title {
  font-size: .6875rem;
  font-weight: 800;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 12px;
}

/* 头部操作区 ------------------------------------------------------- */

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.header-cta { padding: .62em 1.15em; font-size: .875rem; }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 15px;
  font-size: .8125rem;
  font-weight: 800;
  letter-spacing: .08em;
  color: var(--paper);
  background: rgba(35, 181, 224, .1);
  border: 1px solid rgba(35, 181, 224, .34);
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: background-color .2s var(--ease-soft), border-color .2s var(--ease-soft);
}

.nav-toggle:hover {
  background: rgba(35, 181, 224, .2);
  border-color: var(--aqua);
}

.nav-toggle-bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 16px;
  height: 12px;
}

.nav-toggle-bars i {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform .26s var(--ease-out), width .26s var(--ease-out);
}

.nav-toggle-bars i:first-child { width: 100%; }
.nav-toggle-bars i:last-child { width: 62%; margin-inline-start: auto; }

.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:first-child {
  transform: translateY(3px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:last-child {
  width: 100%;
  margin-inline-start: 0;
  transform: translateY(-3px) rotate(-45deg);
}

/* 滚动进度 --------------------------------------------------------- */

.header-progress {
  position: absolute;
  inset-inline: 0;
  inset-block-end: -1px;
  height: 2px;
  overflow: hidden;
  pointer-events: none;
}

.header-progress i {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--aqua), var(--lime));
}

/* ============================================================== FOOTER */

.site-footer {
  margin-top: clamp(56px, 8vw, 110px);
  padding-block: clamp(44px, 6vw, 76px) 26px;
  border-top: 1px solid var(--line-soft);
  background:
    linear-gradient(180deg, rgba(14, 37, 55, 0) 0%, rgba(14, 37, 55, .78) 24%, rgba(6, 20, 33, .98) 100%);
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(0, 1.9fr) minmax(0, 1.25fr);
  gap: 42px 38px;
  align-items: start;
}

.footer-brand .brand { margin-bottom: 18px; }

.footer-closing {
  max-width: 34ch;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--text-dim);
}

.footer-facts {
  margin-top: 16px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: .8125rem;
  letter-spacing: .04em;
  color: var(--muted);
}

.footer-facts span { color: var(--lime); font-weight: 700; }

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 26px 20px;
}

.footer-col-title {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 14px;
  font-size: .75rem;
  font-weight: 800;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--paper);
}

.footer-col-title::before {
  content: "";
  width: 15px;
  height: 2px;
  border-radius: 2px;
  background: var(--aqua);
}

.footer-links {
  display: grid;
  gap: 10px;
  list-style: none;
}

.footer-links a {
  display: inline-block;
  font-size: .9375rem;
  color: #A6BCCA;
  text-decoration: none;
  transition: color .2s var(--ease-soft), padding-inline-start .2s var(--ease-soft);
}

.footer-links a:hover {
  color: var(--aqua-soft);
  padding-inline-start: 5px;
}

.footer-meta {
  padding: 20px 22px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md) var(--radius-md) var(--radius-md) 4px;
  background: linear-gradient(160deg, rgba(14, 37, 55, .86), rgba(9, 26, 42, .68));
}

.footer-meta-title {
  margin-bottom: 12px;
  font-size: .75rem;
  font-weight: 800;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--aqua-soft);
}

.footer-contact {
  font-size: .875rem;
  line-height: 1.7;
  color: var(--text-body);
  word-break: break-word;
}

.footer-note {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--line-soft);
  font-size: .8125rem;
  line-height: 1.7;
  color: var(--muted);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  margin-top: clamp(34px, 4.6vw, 56px);
  padding-top: 20px;
  border-top: 1px solid var(--line-soft);
  font-size: .8125rem;
  letter-spacing: .04em;
  color: var(--muted);
}

.footer-copy { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.footer-icp { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

/* ============================================================== 动效 */

html.js .reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .42s var(--ease-out), transform .42s var(--ease-out);
}

html.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

[data-disclosure-panel][hidden] { display: none; }

/* ========================================================== 响应式 */

@media (max-width: 1080px) {
  :root { --shell-pad: 28px; }

  .footer-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  }

  .footer-meta { grid-column: 1 / -1; }
}

@media (max-width: 960px) {
  :root { --header-h: 64px; }

  .header-actions { margin-inline-start: auto; }
  .header-cta { display: none; }
  .nav-toggle { display: inline-flex; }

  .primary-nav {
    position: fixed;
    inset-block: 0;
    inset-inline-end: 0;
    z-index: 70;
    width: min(88vw, 380px);
    margin: 0;
    padding: calc(var(--header-h) + 20px) 24px 40px;
    background: linear-gradient(180deg, rgba(13, 34, 52, .99), rgba(6, 20, 33, .99));
    border-inline-start: 1px solid var(--line-strong);
    box-shadow: -30px 0 70px -34px rgba(0, 0, 0, .95);
    overflow-y: auto;
    overscroll-behavior: contain;
    transform: translateX(103%);
    transition: transform .34s var(--ease-out);
  }

  .primary-nav[data-open] { transform: translateX(0); }

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

  .nav-list a {
    display: block;
    padding: 15px 4px;
    font-size: 1.0625rem;
    font-weight: 700;
    color: var(--paper);
    border-bottom: 1px solid rgba(44, 66, 87, .55);
  }

  .nav-list a::after { display: none; }

  .nav-list a[aria-current="page"] {
    color: var(--aqua-soft);
    padding-inline-start: 16px;
  }

  .nav-list a[aria-current="page"]::before {
    content: "";
    position: absolute;
    inset-inline-start: 0;
    inset-block-start: 50%;
    width: 8px;
    height: 8px;
    margin-top: -4px;
    border-radius: 50%;
    background: var(--lime);
    box-shadow: 0 0 0 4px rgba(184, 242, 74, .18);
  }

  .nav-list li { position: relative; }

  .nav-utility {
    display: block;
    margin-top: 30px;
    padding-top: 24px;
    border-top: 1px solid var(--line-soft);
  }

  .nav-utility ul {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    list-style: none;
  }

  .nav-utility ul a {
    display: inline-block;
    padding: 7px 13px;
    font-size: .8125rem;
    font-weight: 650;
    letter-spacing: .04em;
    color: var(--aqua-soft);
    background: rgba(35, 181, 224, .11);
    border: 1px solid rgba(35, 181, 224, .26);
    border-radius: var(--radius-pill);
    text-decoration: none;
  }

  .nav-utility-cta {
    width: 100%;
    margin-top: 20px;
  }

  body.nav-open { overflow: hidden; }

  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-meta { grid-column: auto; }
}

@media (max-width: 860px) {
  .brand-sub { display: none; }
}

@media (max-width: 640px) {
  :root { --shell-pad: 20px; }

  body { font-size: 15.5px; }

  .brand-mark { width: 36px; height: 36px; border-radius: 11px 11px 11px 4px; }
  .brand-name { font-size: 1rem; }

  .nav-toggle-label { display: none; }
  .nav-toggle { padding: 10px 12px; }

  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-base { flex-direction: column; align-items: flex-start; }
  .header-progress { height: 2px; }
}

@media (max-width: 420px) {
  .footer-cols { grid-template-columns: minmax(0, 1fr); }
}

/* ==================================================== 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;
  }

  html.js .reveal,
  html.js .reveal.is-visible {
    opacity: 1 !important;
    transform: none !important;
  }

  .primary-nav { transition: none !important; }
  .btn:hover { transform: none; }
}