/* ============================================================
   博亚娱乐会馆 · /assets/site.css
   共享层：reset、变量、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;
  scroll-padding-top: calc(var(--header-h) + 20px);
}

body {
  margin: 0;
  background-color: #101A33;
  background-image:
    radial-gradient(900px 520px at 82% -6%, rgba(201, 162, 74, .10), transparent 62%),
    radial-gradient(720px 460px at 4% 10%, rgba(47, 143, 123, .07), transparent 60%);
  background-repeat: no-repeat;
  color: #F3EDE2;
  font-family: "Inter", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, p, figure, blockquote, dl, dd { margin: 0; }
[hidden] { display: none !important; }
::selection { background: rgba(201, 162, 74, .35); color: #F3EDE2; }

:focus-visible {
  outline: 2px solid #E8C77A;
  outline-offset: 3px;
}

/* ---------- 2. 变量 ---------- */
:root {
  --indigo: #101A33;
  --charcoal: #0A0C12;
  --slate: #1C2A46;
  --gold: #C9A24A;
  --gold-bright: #E8C77A;
  --vermilion: #B8392E;
  --jade: #2F8F7B;
  --cream: #F3EDE2;
  --mauve: #6E7691;

  --line: rgba(201, 162, 74, .26);
  --line-soft: rgba(201, 162, 74, .12);
  --line-strong: rgba(201, 162, 74, .58);
  --ink-soft: rgba(243, 237, 226, .74);
  --ink-faint: rgba(243, 237, 226, .48);

  --font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", serif;
  --font-body: "Inter", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --shell: 1360px;
  --gutter: clamp(16px, 4vw, 40px);
  --header-h: 76px;
  --radius-tag: 999px;

  --ease: cubic-bezier(.22, .61, .36, 1);
  --dur: .42s;
}

body.nav-open { overflow: hidden; }

/* ---------- 3. 中文排版 ---------- */
h1, h2, h3, .font-display {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: .01em;
  line-height: 1.32;
  color: var(--cream);
}

h1 { font-size: clamp(30px, 4.2vw, 54px); line-height: 1.22; }
h2 { font-size: clamp(24px, 3vw, 30px); }
h3 { font-size: clamp(19px, 2.2vw, 24px); }

p { text-wrap: pretty; }

/* ---------- 4. 布局工具 ---------- */
.shell {
  width: min(var(--shell), 100% - (var(--gutter) * 2));
  margin-inline: auto;
}

.content-shell {
  width: min(860px, 100% - (var(--gutter) * 2));
  margin-inline: auto;
}

.page-offset { padding-top: calc(var(--header-h) + clamp(28px, 5vw, 64px)); }

.section {
  position: relative;
  padding: clamp(56px, 8vw, 104px) 0;
}
.section + .section { border-top: 1px solid var(--line-soft); }

.section-head {
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-width: 780px;
  margin-bottom: clamp(28px, 4vw, 52px);
}

.section-title { font-family: var(--font-display); font-size: clamp(24px, 3vw, 32px); font-weight: 700; }
.section-lead { font-size: 17px; line-height: 1.85; color: var(--ink-soft); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--gold);
}
.eyebrow::before { content: ""; width: 28px; height: 1px; background: var(--gold); }

.index-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--gold);
}

.rule { height: 1px; background: var(--line); border: 0; margin: 0; }
.rule--gold { background: var(--line-strong); }

.grid { display: grid; gap: clamp(20px, 3vw, 36px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.asym-3 {
  display: grid;
  grid-template-columns: minmax(0, 58fr) minmax(0, 27fr) minmax(0, 15fr);
  gap: clamp(20px, 3vw, 40px);
  align-items: start;
}

/* ---------- 5. 通用组件 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 26px;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--cream);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .18em;
  text-align: center;
  transition: background-color .25s var(--ease), color .25s var(--ease), border-color .25s var(--ease);
}
.btn:hover { background: rgba(201, 162, 74, .12); border-color: var(--gold-bright); color: var(--gold-bright); }

.btn--ghost { border-color: var(--line); color: var(--ink-soft); }
.btn--ghost:hover { border-color: var(--gold-bright); color: var(--gold-bright); }

.btn--gold { background: var(--gold); border-color: var(--gold); color: var(--charcoal); }
.btn--gold:hover { background: var(--gold-bright); border-color: var(--gold-bright); color: var(--charcoal); }

.btn--primary { background: var(--vermilion); border-color: var(--vermilion); color: var(--cream); }
.btn--primary:hover { background: #C94236; border-color: #C94236; color: var(--cream); }

.btn--sm { padding: 9px 16px; font-size: 12px; letter-spacing: .14em; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-tag);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--ink-soft);
}
.tag--jade { border-color: rgba(47, 143, 123, .6); background: rgba(47, 143, 123, .12); color: #6FD3BC; }
.tag--gold { border-color: var(--line-strong); background: rgba(201, 162, 74, .10); color: var(--gold-bright); }
.tag--red { border-color: rgba(184, 57, 46, .6); background: rgba(184, 57, 46, .12); color: #EE8C80; }

.breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mauve);
}
.breadcrumb-list { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.breadcrumb-item { display: inline-flex; align-items: center; gap: 10px; }
.breadcrumb-item + .breadcrumb-item::before { content: "/"; color: var(--line-strong); }
.breadcrumb-link { color: var(--ink-soft); transition: color .2s var(--ease); }
.breadcrumb-link:hover { color: var(--gold-bright); }

.exhibit-label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 18px;
  border-left: 1px solid var(--gold);
  background: linear-gradient(90deg, rgba(201, 162, 74, .09), transparent 78%);
}
.exhibit-label__code { font-family: var(--font-mono); font-size: 11px; letter-spacing: .2em; color: var(--gold); }
.exhibit-label__title { font-family: var(--font-display); font-size: 18px; font-weight: 700; color: var(--cream); }
.exhibit-label__meta { font-size: 13px; color: var(--mauve); }

.panel {
  position: relative;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}
.panel-title { margin-top: 10px; font-family: var(--font-display); font-size: 19px; font-weight: 700; color: var(--cream); }
.panel-meta { margin-top: 8px; font-family: var(--font-mono); font-size: 11px; letter-spacing: .18em; color: var(--mauve); }
.panel p { margin-top: 10px; font-size: 15px; line-height: 1.8; color: var(--ink-soft); }

.accordion { border-top: 1px solid var(--line); }
.accordion-item { border-bottom: 1px solid var(--line); }
.accordion-trigger {
  display: flex;
  align-items: center;
  gap: 16px;
  width: 100%;
  padding: 20px 4px;
  text-align: left;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--cream);
  transition: color .25s var(--ease);
}
.accordion-trigger:hover { color: var(--gold-bright); }
.accordion-trigger::after {
  content: "";
  flex: none;
  margin-left: auto;
  width: 9px;
  height: 9px;
  border-right: 1px solid var(--gold-bright);
  border-bottom: 1px solid var(--gold-bright);
  transform: rotate(45deg);
  transition: transform .26s var(--ease);
}
.accordion-trigger[aria-expanded="true"]::after { transform: rotate(225deg); }
.accordion-index { font-family: var(--font-mono); font-size: 12px; letter-spacing: .14em; color: var(--gold); }
.accordion-panel { overflow: hidden; transition: height .26s var(--ease); }
.accordion-panel-inner { padding: 0 4px 24px; font-size: 16px; line-height: 1.85; color: var(--ink-soft); }

.media-frame {
  position: relative;
  overflow: hidden;
  background: var(--slate);
  border: 1px solid var(--line);
}
.media-frame::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 42px;
  height: 1px;
  background: var(--gold);
  z-index: 2;
}
.media-frame img,
.media-frame svg,
.media-frame video { width: 100%; height: 100%; object-fit: cover; }
.media-frame--banner { aspect-ratio: 21 / 9; }
.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 3 / 4; }

.media-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .24em;
  text-align: center;
  color: rgba(243, 237, 226, .4);
}
.media-caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--mauve);
}

.prose { font-size: 17px; line-height: 1.85; color: var(--ink-soft); }
.prose > * + * { margin-top: 1.1em; }
.prose h2 { margin-top: 2em; font-family: var(--font-display); font-size: clamp(22px, 2.6vw, 28px); color: var(--cream); }
.prose h3 { margin-top: 1.6em; font-family: var(--font-display); font-size: 19px; color: var(--cream); }
.prose strong { color: var(--cream); font-weight: 600; }
.prose li { position: relative; padding-left: 20px; }
.prose li + li { margin-top: .5em; }
.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .74em;
  width: 8px;
  height: 1px;
  background: var(--gold);
}
.prose a { color: var(--cream); border-bottom: 1px solid var(--line-strong); }
.prose a:hover { color: var(--gold-bright); border-color: var(--gold-bright); }

/* ---------- 6. 显现与返回顶部 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}
[data-reveal].is-visible { opacity: 1; transform: none; }

.to-top {
  position: fixed;
  right: clamp(16px, 3vw, 32px);
  bottom: clamp(16px, 3vw, 32px);
  z-index: 70;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  background: rgba(28, 42, 70, .92);
  border: 1px solid var(--line);
  color: var(--gold-bright);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity .3s var(--ease), transform .3s var(--ease), visibility .3s var(--ease), background-color .25s var(--ease), border-color .25s var(--ease);
}
.to-top::before {
  content: "";
  width: 9px;
  height: 9px;
  border-left: 1px solid currentColor;
  border-top: 1px solid currentColor;
  transform: rotate(45deg) translate(2px, 2px);
}
.to-top.is-visible { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { background: var(--slate); border-color: var(--gold-bright); }

/* ---------- 7. 头部 ---------- */
.skip-link {
  position: absolute;
  left: 16px;
  top: -72px;
  z-index: 120;
  padding: 10px 18px;
  background: var(--gold);
  color: var(--charcoal);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  transition: top .25s var(--ease);
}
.skip-link:focus { top: 12px; }

.site-header {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  z-index: 90;
  background: linear-gradient(to bottom, rgba(10, 12, 18, .66), rgba(10, 12, 18, 0));
  transition: background-color .35s var(--ease), box-shadow .35s var(--ease);
}
.site-header::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 1px;
  background: var(--line);
  opacity: 0;
  transition: opacity .35s var(--ease);
}
.site-header[data-scrolled="true"] {
  background: var(--indigo);
  background-image: none;
  box-shadow: 0 18px 40px rgba(0, 0, 0, .38);
}
.site-header[data-scrolled="true"]::after { opacity: 1; }
body.nav-open .site-header { background: var(--charcoal); background-image: none; }

.header-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  align-items: center;
  gap: clamp(12px, 2vw, 32px);
  width: min(1440px, 100% - (var(--gutter) * 2));
  min-height: var(--header-h);
  margin-inline: auto;
}

.brand { display: inline-flex; align-items: center; gap: 12px; padding: 6px 0; min-width: 0; }
.brand-mark {
  position: relative;
  flex: none;
  width: 15px;
  height: 15px;
  border: 1px solid var(--gold);
}
.brand-mark::after {
  content: "";
  position: absolute;
  inset: 3px;
  background: var(--gold);
}
.brand-text { display: flex; flex-direction: column; min-width: 0; }
.brand-name {
  display: block;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: .1em;
  line-height: 1.2;
  color: var(--cream);
  white-space: nowrap;
}
.brand-tagline {
  display: block;
  margin-top: 3px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .22em;
  color: var(--ink-faint);
  white-space: nowrap;
}

.main-nav { justify-self: center; }
.nav-list { display: flex; align-items: center; gap: 2px; counter-reset: nav-i; }
.nav-item { display: flex; }
.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 10px 14px;
  font-size: 14px;
  letter-spacing: .06em;
  color: var(--ink-soft);
  transition: color .25s var(--ease);
}
.nav-link::before {
  counter-increment: nav-i;
  content: "0" counter(nav-i);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .08em;
  color: var(--gold);
  opacity: .6;
  transition: opacity .25s var(--ease);
}
.nav-link::after {
  content: "";
  position: absolute;
  right: 14px;
  bottom: 3px;
  left: 14px;
  height: 1px;
  background: var(--gold-bright);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .3s var(--ease);
}
.nav-link:hover { color: var(--cream); }
.nav-link:hover::after { transform: scaleX(1); }
.nav-link[aria-current="page"] { color: var(--gold-bright); }
.nav-link[aria-current="page"]::before { opacity: 1; }
.nav-link[aria-current="page"]::after { transform: scaleX(1); }

.header-tools { display: flex; align-items: center; gap: 12px; justify-self: end; }
.header-cta { white-space: nowrap; }

.account { position: relative; }
.account-toggle {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 9px 14px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--cream);
  transition: border-color .25s var(--ease), background-color .25s var(--ease), color .25s var(--ease);
}
.account-toggle::after {
  content: "";
  width: 6px;
  height: 6px;
  border-right: 1px solid var(--gold-bright);
  border-bottom: 1px solid var(--gold-bright);
  transform: rotate(45deg) translate(-1px, -1px);
  transition: transform .25s var(--ease);
}
.account-toggle:hover { border-color: var(--line-strong); color: var(--gold-bright); }
.account-toggle[aria-expanded="true"] { background: var(--slate); border-color: var(--line-strong); color: var(--gold-bright); }
.account-toggle[aria-expanded="true"]::after { transform: rotate(225deg) translate(-1px, -1px); }

.account-panel {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  z-index: 6;
  width: 240px;
  padding: 16px;
  background: var(--slate);
  border: 1px solid var(--line);
  box-shadow: 0 24px 48px rgba(0, 0, 0, .48);
}
.account-panel-title {
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--gold);
}
.account-link {
  display: block;
  padding: 9px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 14px;
  color: var(--ink-soft);
  transition: color .2s var(--ease), padding-left .2s var(--ease);
}
.account-link:last-child { border-bottom: 0; }
.account-link:hover { color: var(--gold-bright); padding-left: 6px; }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--cream);
  transition: border-color .25s var(--ease), color .25s var(--ease);
}
.nav-toggle:hover { border-color: var(--line-strong); color: var(--gold-bright); }
.nav-toggle-label { line-height: 1; }
.nav-toggle-icon { position: relative; width: 18px; height: 10px; }
.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 1px;
  background: currentColor;
  transition: transform .3s var(--ease), top .3s var(--ease);
}
.nav-toggle-icon::before { top: 0; }
.nav-toggle-icon::after { top: 9px; }
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before { top: 4px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after { top: 4px; transform: rotate(-45deg); }

.scroll-progress {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), var(--gold-bright));
  transform: scaleX(0);
  transform-origin: left center;
  z-index: 3;
}

/* ---------- 8. 页脚 ---------- */
.site-footer {
  position: relative;
  background-color: var(--charcoal);
  background-image:
    linear-gradient(to right, var(--line-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-soft) 1px, transparent 1px);
  background-size: 120px 120px;
  border-top: 1px solid var(--line);
  color: var(--cream);
}

.footer-main {
  display: grid;
  grid-template-columns: minmax(220px, .9fr) 2.1fr;
  gap: clamp(32px, 5vw, 72px);
  width: min(var(--shell), 100% - (var(--gutter) * 2));
  margin-inline: auto;
  padding: clamp(48px, 7vw, 80px) 0 clamp(34px, 4vw, 52px);
}

.footer-brand-name {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--cream);
}
.footer-brand-tagline {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--ink-faint);
}
.footer-rule { display: block; width: 58px; height: 1px; margin: 22px 0; background: var(--gold); }
.footer-brand-meta { max-width: 300px; font-size: 14px; line-height: 1.8; color: var(--ink-soft); }

.footer-cols { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(20px, 3vw, 40px); }
.footer-col-title {
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .26em;
  color: var(--gold);
}
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  color: var(--ink-soft);
  transition: color .2s var(--ease), padding-left .2s var(--ease);
}
.footer-link::before {
  content: "";
  width: 10px;
  height: 1px;
  background: var(--gold);
  opacity: .6;
  transition: width .2s var(--ease), opacity .2s var(--ease);
}
.footer-link:hover { color: var(--gold-bright); }
.footer-link:hover::before { width: 18px; opacity: 1; }

.footer-service { background: var(--slate); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.footer-service-inner {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, auto)) minmax(0, 1fr);
  align-items: center;
  gap: clamp(18px, 3vw, 48px);
  width: min(var(--shell), 100% - (var(--gutter) * 2));
  margin-inline: auto;
  padding: 26px 0;
}
.service-item { display: flex; flex-direction: column; gap: 6px; }
.service-label { font-family: var(--font-mono); font-size: 10px; letter-spacing: .26em; color: var(--gold); }
.service-value { font-family: var(--font-mono); font-size: 16px; letter-spacing: .04em; color: var(--cream); }
.service-note { font-size: 13px; line-height: 1.75; color: var(--ink-soft); }

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 28px;
  width: min(var(--shell), 100% - (var(--gutter) * 2));
  margin-inline: auto;
  padding: 22px 0 34px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mauve);
}
.footer-copy, .footer-icp { margin: 0; }
.legal-links { display: flex; flex-wrap: wrap; gap: 22px; margin-left: auto; }
.legal-link {
  color: var(--ink-soft);
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.legal-link:hover { color: var(--gold-bright); border-color: var(--gold-bright); }

/* ---------- 9. 响应式 ---------- */
@media (max-width: 1180px) {
  .nav-link { padding: 10px 10px; font-size: 13px; }
  .nav-link::after { right: 10px; left: 10px; }
}

@media (max-width: 1080px) {
  :root { --header-h: 66px; }

  .header-inner { grid-template-columns: minmax(0, 1fr) auto; }
  .header-cta { display: none; }
  .nav-toggle { display: inline-flex; }

  .main-nav {
    position: fixed;
    top: var(--header-h);
    right: 0;
    left: 0;
    max-height: calc(100vh - var(--header-h));
    max-height: calc(100dvh - var(--header-h));
    overflow-y: auto;
    padding: 8px var(--gutter) 30px;
    background: var(--charcoal);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 30px 60px rgba(0, 0, 0, .55);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    pointer-events: none;
    transition: opacity .28s var(--ease), transform .28s var(--ease), visibility .28s var(--ease);
  }
  .main-nav[data-open="true"] { opacity: 1; visibility: visible; transform: none; pointer-events: auto; }

  .nav-list { flex-direction: column; align-items: stretch; gap: 0; }
  .nav-item { border-bottom: 1px solid var(--line-soft); }
  .nav-item:last-child { border-bottom: 0; }
  .nav-link { padding: 16px 0; font-size: 16px; color: var(--cream); }
  .nav-link::after { display: none; }
  .nav-link::before { margin-right: 4px; font-size: 11px; }

  .asym-3 { grid-template-columns: minmax(0, 1fr); }
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .footer-main { grid-template-columns: minmax(0, 1fr); }
  .footer-service-inner { grid-template-columns: minmax(0, 1fr); align-items: start; gap: 18px; }
}

@media (max-width: 760px) {
  body { font-size: 16px; }
  .grid--3, .grid--4 { grid-template-columns: minmax(0, 1fr); }
  .grid--2 { grid-template-columns: minmax(0, 1fr); }
  .footer-cols { grid-template-columns: minmax(0, 1fr); gap: 26px; }
  .legal-links { margin-left: 0; }
}

@media (max-width: 520px) {
  .brand-tagline { display: none; }
  .brand-name { font-size: 17px; letter-spacing: .06em; }
  .nav-toggle-label { display: none; }
  .account-toggle { padding: 9px 11px; letter-spacing: .1em; }
  .footer-brand-name { font-size: 21px; }
}

/* ---------- 10. 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; transform: none; }
  .scroll-progress { transition: none; }
}