/* =========================================================
   博澳娱乐会馆 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 头部 / 页脚 / 通用组件
   ========================================================= */

:root {
  /* 色彩令牌 */
  --ink-900: #050B18;
  --ink-800: #0A1526;
  --ink-700: #102236;
  --steel-600: #1B3A55;
  --mist-400: #7FA0B8;
  --light-100: #E9F2F6;
  --violet-slate: #2E3A5C;
  --neon-cyan: #38E1D2;
  --coral: #FF7A54;
  --amber: #F2B24C;

  /* 结构与质感 */
  --line: 2px solid var(--steel-600);
  --line-thin: 1px solid var(--steel-600);
  --radius: 4px;
  --shadow-hard: 0 22px 48px -22px rgba(0, 0, 0, .92), 0 2px 0 0 rgba(56, 225, 210, .05);
  --shadow-lift: 0 30px 60px -26px rgba(0, 0, 0, .95);

  /* 排版 */
  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Heiti SC", sans-serif;
  --font-mono: "JetBrains Mono", "Source Han Mono SC", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  /* 栅格 */
  --container: 1240px;
  --gutter: clamp(18px, 4vw, 40px);
  --grid-gap: clamp(16px, 2.4vw, 28px);
  --chapter-gap: clamp(56px, 8vw, 112px);

  /* 动效 */
  --ease-hall: cubic-bezier(.2, .7, .2, 1);
}

/* ---------- reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--ink-900);
  background-image:
    radial-gradient(62vw 62vw at 86% -12%, rgba(56, 225, 210, .11), transparent 62%),
    radial-gradient(54vw 54vw at 4% 6%, rgba(46, 58, 92, .55), transparent 66%),
    radial-gradient(70vw 46vw at 50% 112%, rgba(242, 178, 76, .06), transparent 70%);
  background-attachment: fixed;
  background-repeat: no-repeat;
  color: var(--light-100);
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.85;
  letter-spacing: .01em;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--neon-cyan); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--coral); }

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

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

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

hr {
  height: 0;
  margin: var(--chapter-gap) 0;
  border: 0;
  border-top: 1px solid rgba(56, 225, 210, .28);
}

::selection { background: var(--neon-cyan); color: #04121A; }

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

.skip-link {
  position: absolute;
  left: 12px;
  top: -72px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--neon-cyan);
  color: #04121A;
  font-weight: 800;
  font-size: 15px;
  text-decoration: none;
  border-radius: 0 0 var(--radius) var(--radius);
  transition: top .18s var(--ease-hall);
}
.skip-link:focus { top: 0; color: #04121A; }

#main-content { display: block; scroll-margin-top: 96px; }

/* ---------- 中文排版基础 ---------- */
.display {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(34px, 5vw, 68px);
  line-height: 1.08;
  letter-spacing: -.02em;
}

.h2 {
  margin: 0;
  font-weight: 700;
  font-size: clamp(22px, 2.6vw, 34px);
  line-height: 1.25;
  letter-spacing: -.01em;
}

.h3 {
  margin: 0;
  font-weight: 700;
  font-size: clamp(18px, 1.8vw, 22px);
  line-height: 1.4;
}

.lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.8;
  color: var(--mist-400);
}

.mono {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  font-variant-numeric: tabular-nums;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--neon-cyan);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--neon-cyan);
}

.mono-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 1px solid var(--steel-600);
  border-radius: var(--radius);
  background: rgba(16, 34, 54, .85);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--amber);
}

.text-mist { color: var(--mist-400); }
.text-cyan { color: var(--neon-cyan); }
.text-amber { color: var(--amber); }

/* ---------- 布局容器 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.container--narrow { max-width: 820px; }

.section {
  padding: var(--chapter-gap) 0 0;
}

.section--tight { padding-top: clamp(30px, 4vw, 56px); }

.stack > * + * { margin-top: clamp(12px, 1.6vw, 20px); }

/* ---------- 栅格 ---------- */
.grid {
  display: grid;
  gap: var(--grid-gap);
}
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.grid--split { grid-template-columns: minmax(0, 34fr) minmax(0, 66fr); }
.grid--even { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: span 12; }

/* ---------- 面板与媒体框 ---------- */
.panel {
  padding: clamp(18px, 2.6vw, 28px);
  background: var(--ink-700);
  border: var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard);
}

.panel--tint {
  background:
    linear-gradient(158deg, rgba(46, 58, 92, .62) 0%, rgba(16, 34, 54, .94) 58%, rgba(10, 21, 38, .98) 100%);
}

.panel--quiet { box-shadow: none; background: var(--ink-800); }

.media {
  position: relative;
  display: block;
  overflow: hidden;
  border: var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(150deg, var(--ink-700) 0%, var(--violet-slate) 100%);
  box-shadow: var(--shadow-hard);
  isolation: isolate;
}

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

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(70% 58% at 78% 6%, rgba(56, 225, 210, .22), transparent 62%),
    linear-gradient(180deg, rgba(5, 11, 24, 0) 42%, rgba(5, 11, 24, .72) 100%);
  z-index: 1;
}

.media__placeholder {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: rgba(233, 242, 246, .55);
  text-align: center;
}

.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 3 / 4; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 12px 22px;
  border: 2px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: .02em;
  text-decoration: none;
  line-height: 1.3;
  cursor: pointer;
  transition: transform .18s var(--ease-hall), box-shadow .18s var(--ease-hall),
              background-color .18s var(--ease-hall), color .18s var(--ease-hall),
              border-color .18s var(--ease-hall);
}

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

.btn--primary {
  background: var(--coral);
  border-color: #FFB097;
  color: #1A0D07;
  box-shadow: 0 12px 26px -12px rgba(255, 122, 84, .85);
}
.btn--primary:hover {
  background: #FF8E6E;
  color: #1A0D07;
  box-shadow: 0 18px 34px -14px rgba(255, 122, 84, .95);
}

.btn--ghost {
  background: rgba(16, 34, 54, .7);
  border-color: var(--steel-600);
  color: var(--neon-cyan);
}
.btn--ghost:hover {
  border-color: var(--neon-cyan);
  background: rgba(56, 225, 210, .1);
  color: var(--neon-cyan);
}

.btn--amber {
  background: rgba(242, 178, 76, .12);
  border-color: rgba(242, 178, 76, .65);
  color: var(--amber);
}
.btn--amber:hover {
  background: rgba(242, 178, 76, .22);
  border-color: var(--amber);
  color: var(--amber);
}

/* ---------- 面包屑 ---------- */
.breadcrumb { margin: clamp(18px, 3vw, 30px) 0 0; }

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mist-400);
}

.breadcrumb-list li { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumb-list li + li::before { content: "/"; color: var(--steel-600); }
.breadcrumb-list a {
  color: var(--mist-400);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease-hall), border-color .18s var(--ease-hall);
}
.breadcrumb-list a:hover { color: var(--neon-cyan); border-bottom-color: var(--neon-cyan); }
.breadcrumb-list [aria-current="page"] { color: var(--neon-cyan); }

/* =========================================================
   头部
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(5, 11, 24, .94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 0 rgba(56, 225, 210, .22);
}

/* 品牌说明层 */
.brand-bar {
  max-height: 200px;
  overflow: hidden;
  border-bottom: 1px solid rgba(56, 225, 210, .18);
  background:
    linear-gradient(180deg, rgba(16, 34, 54, .95) 0%, rgba(5, 11, 24, .98) 130%);
  transition: max-height .34s var(--ease-hall), opacity .24s var(--ease-hall),
              border-color .24s var(--ease-hall);
}

.site-header[data-condensed] .brand-bar {
  max-height: 0;
  opacity: 0;
  border-bottom-color: transparent;
}

.brand-inner {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 13px var(--gutter);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px clamp(14px, 2.4vw, 30px);
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--light-100);
  text-decoration: none;
  flex: 0 0 auto;
}
.brand-mark:hover { color: var(--light-100); }

.brand-mark-glyph {
  position: relative;
  display: block;
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  border: 2px solid var(--neon-cyan);
  border-radius: 6px;
  background:
    radial-gradient(circle at 30% 24%, rgba(56, 225, 210, .62), rgba(56, 225, 210, 0) 62%),
    linear-gradient(145deg, var(--violet-slate), var(--ink-700));
  box-shadow: 0 0 0 1px rgba(5, 11, 24, .9), 0 0 20px -5px rgba(56, 225, 210, .7);
}
.brand-mark-glyph::after {
  content: "";
  position: absolute;
  inset: 9px;
  border: 1px solid rgba(242, 178, 76, .88);
  border-radius: 2px;
}

.brand-name {
  font-size: 20px;
  font-weight: 900;
  letter-spacing: .04em;
  white-space: nowrap;
}

.brand-descriptor {
  margin: 0;
  padding-left: clamp(0px, 1.2vw, 16px);
  border-left: 1px solid var(--steel-600);
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--mist-400);
  letter-spacing: .02em;
}

.brand-side {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.brand-meta {
  padding: 3px 9px;
  border: 1px solid var(--steel-600);
  border-radius: var(--radius);
  background: rgba(16, 34, 54, .8);
  color: var(--mist-400);
  font-size: 11.5px;
  letter-spacing: .08em;
  white-space: nowrap;
}

.brand-contact {
  padding: 5px 13px;
  border: 1px solid rgba(242, 178, 76, .55);
  border-radius: var(--radius);
  color: var(--amber);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .06em;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color .18s var(--ease-hall), border-color .18s var(--ease-hall);
}
.brand-contact:hover {
  color: var(--amber);
  background: rgba(242, 178, 76, .14);
  border-color: var(--amber);
}

/* 栏目轨道层 */
.nav-bar {
  background: linear-gradient(180deg, rgba(10, 21, 38, .96), rgba(5, 11, 24, .98));
  border-bottom: 1px solid var(--steel-600);
}

.nav-inner {
  position: relative;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.8vw, 22px);
  min-height: 64px;
}

.site-nav { flex: 1 1 auto; min-width: 0; }

.nav-track {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 2px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-item { flex: 0 0 auto; }

.nav-link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  color: var(--mist-400);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .02em;
  text-decoration: none;
  white-space: nowrap;
  transition: color .18s var(--ease-hall), background-color .18s var(--ease-hall),
              border-color .18s var(--ease-hall), box-shadow .18s var(--ease-hall);
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--steel-600);
  transition: color .18s var(--ease-hall);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--light-100);
  background: rgba(56, 225, 210, .09);
  border-color: rgba(56, 225, 210, .4);
}
.nav-link:hover .nav-index,
.nav-link:focus-visible .nav-index { color: var(--neon-cyan); }

.nav-link[aria-current="page"] {
  color: var(--light-100);
  background: rgba(56, 225, 210, .12);
  border-color: var(--neon-cyan);
  box-shadow: inset 0 -2px 0 var(--neon-cyan);
}
.nav-link[aria-current="page"] .nav-index { color: var(--neon-cyan); }

.nav-cta {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  background: var(--coral);
  border: 2px solid #FFB097;
  border-radius: var(--radius);
  color: #1A0D07;
  font-size: 15px;
  font-weight: 800;
  letter-spacing: .03em;
  text-decoration: none;
  white-space: nowrap;
  box-shadow: 0 10px 24px -10px rgba(255, 122, 84, .85);
  transition: transform .18s var(--ease-hall), box-shadow .18s var(--ease-hall),
              background-color .18s var(--ease-hall);
}
.nav-cta:hover {
  color: #1A0D07;
  background: #FF8E6E;
  transform: translateY(-2px);
  box-shadow: 0 16px 32px -12px rgba(255, 122, 84, .95);
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  background: var(--ink-700);
  border: 2px solid var(--steel-600);
  border-radius: var(--radius);
  color: var(--light-100);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .04em;
  cursor: pointer;
  transition: border-color .18s var(--ease-hall), color .18s var(--ease-hall);
}
.nav-toggle:hover { border-color: var(--neon-cyan); color: var(--neon-cyan); }

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: background-color .18s var(--ease-hall);
}
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform .22s var(--ease-hall);
}
.nav-toggle-bars::before { top: -5px; }
.nav-toggle-bars::after { top: 5px; }

.site-header[data-open] .nav-toggle { border-color: var(--neon-cyan); color: var(--neon-cyan); }
.site-header[data-open] .nav-toggle-bars { background: transparent; }
.site-header[data-open] .nav-toggle-bars::before { transform: translateY(5px) rotate(45deg); }
.site-header[data-open] .nav-toggle-bars::after { transform: translateY(-5px) rotate(-45deg); }

/* =========================================================
   页脚
   ========================================================= */
.site-footer {
  position: relative;
  margin-top: clamp(64px, 9vw, 120px);
  background: var(--ink-800);
  border-top: 1px solid var(--neon-cyan);
  box-shadow: inset 0 1px 0 0 rgba(56, 225, 210, .18);
}

.footer-inner {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: clamp(40px, 6vw, 72px) var(--gutter) clamp(20px, 3vw, 30px);
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(220px, 1.05fr) minmax(0, 2fr);
  gap: clamp(28px, 5vw, 64px);
  align-items: start;
}

.footer-brand-name {
  margin: 0 0 10px;
  font-size: clamp(20px, 2vw, 24px);
  font-weight: 900;
  letter-spacing: .04em;
  color: var(--light-100);
}

.footer-brand-desc {
  margin: 0 0 14px;
  max-width: 30ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist-400);
}

.footer-brand-meta {
  display: inline-block;
  margin: 0;
  padding: 3px 10px;
  border: 1px solid var(--steel-600);
  border-radius: var(--radius);
  background: rgba(16, 34, 54, .8);
  color: var(--amber);
  font-size: 11.5px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 40px);
}

.footer-col-title {
  margin: 0 0 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--steel-600);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--neon-cyan);
}

.footer-links {
  display: grid;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-links a {
  display: inline-block;
  font-size: 15px;
  color: var(--mist-400);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease-hall), border-color .18s var(--ease-hall);
}
.footer-links a:hover {
  color: var(--light-100);
  border-bottom-color: var(--neon-cyan);
}

.footer-contact {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 14px;
  margin-top: clamp(30px, 4.5vw, 52px);
  padding-top: clamp(22px, 3vw, 34px);
  border-top: 1px solid var(--steel-600);
}

.contact-cell {
  padding: 14px 16px;
  border: 1px solid var(--steel-600);
  border-radius: var(--radius);
  background: linear-gradient(158deg, rgba(16, 34, 54, .95), rgba(10, 21, 38, .98));
  box-shadow: 0 14px 26px -20px rgba(0, 0, 0, .95);
}

.contact-label {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--amber);
}

.contact-value {
  display: block;
  font-size: 15px;
  line-height: 1.65;
  color: var(--light-100);
  word-break: break-word;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  margin-top: clamp(26px, 3.5vw, 40px);
  padding-top: 18px;
  border-top: 1px solid var(--steel-600);
}

.footer-legal {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--mist-400);
}

.footer-legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
}
.footer-legal-links a {
  color: var(--mist-400);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease-hall), border-color .18s var(--ease-hall);
}
.footer-legal-links a:hover { color: var(--neon-cyan); border-bottom-color: var(--neon-cyan); }

/* =========================================================
   JS 注入的全局小件
   ========================================================= */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--neon-cyan) 0%, var(--amber) 68%, var(--coral) 100%);
  box-shadow: 0 0 14px rgba(56, 225, 210, .7);
  z-index: 90;
  pointer-events: none;
}

.to-top {
  position: fixed;
  right: clamp(14px, 3vw, 30px);
  bottom: clamp(14px, 3vw, 30px);
  z-index: 75;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border: 2px solid var(--neon-cyan);
  border-radius: var(--radius);
  background: rgba(10, 21, 38, .94);
  color: var(--neon-cyan);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity .24s var(--ease-hall), transform .24s var(--ease-hall),
              background-color .18s var(--ease-hall);
  box-shadow: 0 14px 30px -16px rgba(56, 225, 210, .9);
}
.to-top[data-visible] { opacity: 1; pointer-events: auto; transform: none; }
.to-top:hover { background: rgba(56, 225, 210, .14); }

/* 入场 */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .32s var(--ease-hall), transform .32s var(--ease-hall);
  will-change: opacity, transform;
}
.js [data-reveal].is-visible { opacity: 1; transform: none; }

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

@media (max-width: 900px) {
  body { font-size: 16.5px; }

  .site-header { position: sticky; }

  .brand-bar { max-height: 220px; }
  .brand-inner { padding: 12px var(--gutter); }
  .brand-descriptor { display: none; }
  .brand-meta { display: none; }
  .brand-side { gap: 8px; }

  .nav-inner { min-height: 60px; justify-content: space-between; gap: 10px; }
  .nav-toggle { display: inline-flex; order: 1; }
  .nav-cta { order: 3; margin-left: auto; padding: 8px 14px; font-size: 14px; }

  .site-nav {
    order: 2;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    flex: 0 0 100%;
    width: 100%;
    padding: 14px var(--gutter) 20px;
    background: var(--ink-800);
    border-top: 1px solid var(--steel-600);
    border-bottom: 2px solid var(--neon-cyan);
    box-shadow: 0 28px 50px -22px rgba(0, 0, 0, .95);
    max-height: calc(100vh - 72px);
    overflow-y: auto;
  }
  .site-header[data-open] .site-nav { display: block; }

  .nav-track { flex-direction: column; align-items: stretch; gap: 8px; }
  .nav-item { width: 100%; }
  .nav-link {
    width: 100%;
    padding: 13px 15px;
    border-color: var(--steel-600);
    background: var(--ink-700);
    font-size: 15px;
  }
  .nav-link[aria-current="page"] { background: rgba(56, 225, 210, .16); }
  .nav-index { min-width: 24px; }

  .span-4, .span-5, .span-6, .span-7, .span-8 { grid-column: span 12; }
  .grid--12 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .span-12 { grid-column: span 4; }
  .span-5, .span-7 { grid-column: span 4; }
  .span-4, .span-8 { grid-column: span 4; }
  .span-6 { grid-column: span 4; }
}

@media (max-width: 720px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-contact { grid-template-columns: minmax(0, 1fr); }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .grid--12 { grid-template-columns: minmax(0, 1fr); }
  .span-4, .span-5, .span-6, .span-7, .span-8, .span-12 { grid-column: span 1; }
}

@media (max-width: 520px) {
  .brand-name { font-size: 17px; }
  .brand-mark-glyph { width: 30px; height: 30px; }
  .brand-contact { padding: 4px 10px; font-size: 12.5px; }
  .nav-cta { padding: 8px 12px; font-size: 13px; }
  .nav-toggle { padding: 8px 11px; font-size: 13px; }
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-legal-links { gap: 14px; }
  .btn { width: 100%; }
}

/* =========================================================
   降低动态偏好
   ========================================================= */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    transition-delay: 0ms !important;
  }

  .btn:hover,
  .nav-cta:hover { transform: none; }

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

  .brand-bar { transition: none; }
}