/* ============================================================
   /assets/site.css — 云顶游艺 · WELCOME PLUS 服务中心
   共享外壳：侧边轨道头部 / 深墨页脚 / 基础组件
   ============================================================ */

/* ---------- 1. 变量 ---------- */
:root {
  --ink: #07111C;
  --space: #0E1B2C;
  --space-2: #1B2E45;
  --gold: #F5A623;
  --gold-soft: #FFD98A;
  --jade: #3CB9A0;
  --jade-deep: #1F7F6E;
  --cloud: #F7F4EE;
  --mist: #D8DEE8;
  --coral: #E86A5C;

  --font-display: "Sora", "PingFang SC", "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --rail: 88px;
  --topbar: 64px;
  --max: 1280px;
  --gap: 24px;
  --radius: 16px;
  --ease: cubic-bezier(.2, .7, .2, 1);
  --shadow: 0 6px 12px rgba(14, 27, 44, .08);
}

/* ---------- 2. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, p, ul, ol, figure, blockquote, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; }
a { color: inherit; }

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  background: var(--cloud);
  color: var(--space);
  font-family: var(--font-body);
  font-size: clamp(16px, 1.05vw, 17px);
  line-height: 1.8;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: .04em;
  line-height: 1.24;
  color: var(--ink);
}
p { max-width: 42em; }
::selection { background: var(--gold); color: var(--ink); }

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

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
}
.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--jade-deep);
}
.text-link {
  color: var(--jade-deep);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}
.text-link:hover { color: var(--gold); }

/* ---------- 4. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 200;
  padding: 10px 18px;
  border-radius: 8px;
  background: var(--gold);
  color: var(--ink);
  font-weight: 700;
  font-size: 14px;
  text-decoration: none;
  transform: translateY(-180%);
  transition: transform .18s var(--ease);
}
.skip-link:focus { transform: translateY(0); }

#main-content { scroll-margin-top: calc(var(--topbar) + 16px); }

/* ---------- 5. 头部：移动顶栏 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: var(--topbar);
  padding: 10px clamp(14px, 4vw, 24px);
  background: var(--space);
  color: var(--cloud);
  border-bottom: 1px solid rgba(245, 166, 35, .32);
}

.brand-lockup { flex: 0 1 auto; min-width: 0; }
.brand-lockup__link {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: inherit;
  text-decoration: none;
}
.brand-lockup__mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
  border-radius: 11px;
  background: var(--gold);
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  box-shadow: inset 0 -3px 0 rgba(7, 17, 28, .16);
}
.brand-lockup__text {
  display: flex;
  flex-direction: column;
  gap: 1px;
  min-width: 0;
  line-height: 1.2;
}
.brand-lockup__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  letter-spacing: .14em;
  color: var(--cloud);
}
.brand-lockup__sub {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: .12em;
  color: rgba(247, 244, 238, .56);
  white-space: nowrap;
}

/* 菜单按钮 */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 9px 13px;
  border: 1px solid rgba(247, 244, 238, .28);
  border-radius: 10px;
  color: var(--cloud);
  cursor: pointer;
  transition: border-color .16s var(--ease), color .16s var(--ease);
}
.nav-toggle:hover { border-color: var(--gold); color: var(--gold-soft); }
.nav-toggle__bars { display: grid; gap: 4px; width: 18px; }
.nav-toggle__bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform .18s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:first-child { transform: translateY(3px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:last-child { transform: translateY(-3px) rotate(-45deg); }
.nav-toggle__text {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
}

/* ---------- 6. 导航：移动抽屉 ---------- */
.site-nav {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 80;
  display: flex;
  flex-direction: column;
  gap: 20px;
  width: min(340px, 86vw);
  padding: 24px 22px calc(24px + env(safe-area-inset-bottom));
  background: var(--space);
  color: var(--cloud);
  border-left: 1px solid rgba(245, 166, 35, .32);
  box-shadow: -18px 0 40px rgba(7, 17, 28, .42);
  overflow-y: auto;
  visibility: hidden;
  transform: translateX(103%);
  transition: transform 240ms var(--ease), visibility 240ms var(--ease);
}
.site-nav[data-open] { visibility: visible; transform: translateX(0); }

.site-nav__eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: rgba(247, 244, 238, .42);
}
.site-nav__list { display: flex; flex-direction: column; gap: 0; }
.site-nav__item { position: relative; }
.site-nav__link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 13px 6px 13px 18px;
  border-bottom: 1px solid rgba(247, 244, 238, .12);
  color: rgba(247, 244, 238, .78);
  text-decoration: none;
  transition: color .16s var(--ease);
}
.site-nav__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 3px;
  height: 20px;
  border-radius: 2px;
  background: var(--gold);
  transform: translateY(-50%) scaleY(0);
  transform-origin: center;
  transition: transform .18s var(--ease);
}
.site-nav__link:hover { color: var(--gold-soft); }
.site-nav__link:hover::before,
.site-nav__link[aria-current="page"]::before { transform: translateY(-50%) scaleY(1); }
.site-nav__link[aria-current="page"] {
  color: var(--gold);
  border-bottom-color: rgba(245, 166, 35, .45);
}
.site-nav__idx {
  flex: 0 0 auto;
  min-width: 1.6em;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: rgba(247, 244, 238, .36);
}
.site-nav__link[aria-current="page"] .site-nav__idx { color: var(--gold); }
.site-nav__label {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: .08em;
}

.site-nav__foot {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: auto;
  padding-top: 20px;
  border-top: 1px solid rgba(247, 244, 238, .14);
}
.site-nav__foot .btn { width: 100%; }
.site-nav__status {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--jade);
}
.site-nav__status::before {
  content: "";
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--jade);
  box-shadow: 0 0 0 3px rgba(60, 185, 160, .2);
}
.site-nav__note {
  font-family: var(--font-mono);
  font-size: 10px;
  line-height: 1.9;
  letter-spacing: .05em;
  color: rgba(247, 244, 238, .44);
  word-break: break-all;
}

/* 抽屉遮罩 */
.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 70;
  background: rgba(7, 17, 28, .6);
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s var(--ease);
}
.nav-scrim[data-open] { opacity: 1; pointer-events: auto; }

html[data-nav-open] { overflow: hidden; }

/* ---------- 7. 头部：桌面侧边轨道 ---------- */
@media (min-width: 1024px) {
  body { padding-left: var(--rail); }
  html[data-nav-open] { overflow: auto; }

  .site-header {
    position: fixed;
    inset: 0 auto 0 0;
    width: var(--rail);
    min-height: 0;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    gap: 26px;
    padding: 22px 0 20px;
    border-bottom: 0;
    border-right: 1px solid rgba(245, 166, 35, .28);
    overflow-y: auto;
    overscroll-behavior: contain;
    scrollbar-width: none;
  }
  .site-header::-webkit-scrollbar { display: none; }

  .brand-lockup__link { flex-direction: column; gap: 14px; }
  .brand-lockup__mark { width: 42px; height: 42px; font-size: 19px; }
  .brand-lockup__name { writing-mode: vertical-rl; font-size: 16px; letter-spacing: .34em; }
  .brand-lockup__sub { display: none; }

  .nav-toggle { display: none; }
  .nav-scrim { display: none; }

  .site-nav {
    position: static;
    visibility: visible;
    transform: none;
    width: 100%;
    flex: 1 1 auto;
    align-items: center;
    justify-content: center;
    gap: 20px;
    padding: 0;
    background: none;
    border: 0;
    box-shadow: none;
    overflow: visible;
  }
  .site-nav__eyebrow {
    writing-mode: vertical-rl;
    font-size: 9px;
    letter-spacing: .3em;
    color: rgba(247, 244, 238, .34);
  }
  .site-nav__list { align-items: center; gap: 16px; }
  .site-nav__item { width: 100%; display: flex; justify-content: center; }
  .site-nav__link {
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 0;
    border-bottom: 0;
    color: rgba(247, 244, 238, .72);
  }
  .site-nav__link::before {
    left: 50%;
    top: -12px;
    width: 3px;
    height: 14px;
    transform: translateX(-50%) scaleY(0);
  }
  .site-nav__link:hover::before,
  .site-nav__link[aria-current="page"]::before { transform: translateX(-50%) scaleY(1); }
  .site-nav__label {
    writing-mode: vertical-rl;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: .2em;
    line-height: 1.1;
  }
  .site-nav__idx { min-width: 0; font-size: 9px; }

  .site-nav__foot {
    width: 100%;
    align-items: center;
    gap: 16px;
    padding-top: 18px;
  }
  .site-nav__foot .btn {
    width: auto;
    padding: 13px 8px;
    border-radius: 12px;
    font-size: 11px;
    letter-spacing: .18em;
  }
  .site-nav__foot .btn__label { writing-mode: vertical-rl; line-height: 1.2; }
  .site-nav__status {
    writing-mode: vertical-rl;
    font-size: 10px;
    letter-spacing: .16em;
  }
  .site-nav__status::before { display: none; }
  .site-nav__note { display: none; }
}
@media (min-width: 1024px) and (max-height: 820px) {
  .site-nav__eyebrow { display: none; }
}
@media (max-width: 399px) {
  .brand-lockup__sub { display: none; }
}

/* ---------- 8. 页脚 ---------- */
.site-footer {
  margin-top: clamp(40px, 7vw, 88px);
  padding-top: clamp(36px, 6vw, 64px);
  background: var(--ink);
  color: rgba(247, 244, 238, .78);
  border-top: 3px solid var(--gold);
  background-image:
    radial-gradient(120% 90% at 8% 0%, rgba(245, 166, 35, .14), transparent 58%),
    radial-gradient(90% 80% at 96% 8%, rgba(60, 185, 160, .12), transparent 62%);
  background-repeat: no-repeat;
}
.site-footer__inner {
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 48px);
}
.site-footer__top {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  grid-template-columns: 1fr;
  padding-bottom: clamp(28px, 4vw, 44px);
}
.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
}
.footer-brand__mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--gold);
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  box-shadow: inset 0 -3px 0 rgba(7, 17, 28, .18);
}
.footer-brand__name {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 800;
  letter-spacing: .1em;
  color: var(--cloud);
}
.footer-brand__blurb {
  font-size: 13px;
  letter-spacing: .08em;
  color: rgba(247, 244, 238, .56);
}
.footer-col,
.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.footer-col__title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--gold);
  line-height: 1.6;
}
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-link {
  display: inline-block;
  font-size: 15px;
  color: rgba(247, 244, 238, .76);
  text-decoration: none;
  background: linear-gradient(var(--gold), var(--gold)) left bottom / 0 1px no-repeat;
  transition: color .16s var(--ease), background-size .18s var(--ease);
}
.footer-link:hover,
.footer-link:focus-visible {
  color: var(--gold-soft);
  background-size: 100% 1px;
}
.footer-contact__list { display: flex; flex-direction: column; gap: 12px; }
.footer-contact__item { display: flex; flex-direction: column; gap: 2px; }
.footer-contact__label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: rgba(247, 244, 238, .42);
}
.footer-contact__value {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(247, 244, 238, .86);
  word-break: break-word;
}
.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-block: 20px 28px;
  border-top: 1px solid rgba(247, 244, 238, .14);
}
.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 14px;
  font-size: 12px;
  color: rgba(247, 244, 238, .52);
}
.footer-legal__icp { color: rgba(247, 244, 238, .74); font-size: 12px; }
.footer-legal__sep { color: rgba(247, 244, 238, .24); }
.to-top {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border: 1px solid rgba(247, 244, 238, .26);
  border-radius: 999px;
  color: var(--cloud);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  cursor: pointer;
  transition: border-color .16s var(--ease), color .16s var(--ease);
}
.to-top::after { content: "↑"; font-family: var(--font-body); }
.to-top:hover { border-color: var(--gold); color: var(--gold-soft); }

@media (min-width: 720px) {
  .site-footer__top { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}
@media (min-width: 1024px) {
  .site-footer__top { grid-template-columns: 1.5fr .7fr .7fr 1.15fr; }
  .footer-brand { grid-column: auto; }
}

/* ---------- 9. 布局容器 ---------- */
.container {
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 48px);
}
.container--narrow { max-width: 880px; }
.section { padding-block: clamp(36px, 6vw, 80px); }
.section--space {
  background: var(--space);
  color: rgba(247, 244, 238, .82);
}
.section--space h2,
.section--space h3 { color: var(--cloud); }
.section--space .eyebrow { color: var(--gold); }
.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: clamp(22px, 3vw, 36px);
}
.prose {
  max-width: 720px;
  font-size: 17px;
  line-height: 1.8;
  color: var(--space);
}
.prose > * + * { margin-top: 1.2em; }
.prose h2, .prose h3 { margin-top: 1.8em; }
.prose ul, .prose ol { display: flex; flex-direction: column; gap: .5em; padding-left: 1.3em; list-style: disc; }
.prose ol { list-style: decimal; }
.prose strong { color: var(--ink); }
.section--space .prose { color: rgba(247, 244, 238, .8); }
.section--space .prose strong { color: var(--gold-soft); }

/* Bento 网格 */
.bento {
  display: grid;
  gap: var(--gap);
  grid-template-columns: repeat(12, minmax(0, 1fr));
  grid-auto-flow: row dense;
}
.bento > * { grid-column: span 12; min-width: 0; }
@media (min-width: 720px) {
  .bento > * { grid-column: span 6; }
  .bento > .bento__wide { grid-column: span 12; }
  .bento > .bento__tall { grid-row: span 2; }
}
@media (min-width: 1024px) {
  .bento > * { grid-column: span 4; }
  .bento > .bento__focus { grid-column: span 6; grid-row: span 2; }
  .bento > .bento__wide { grid-column: span 8; }
  .bento > .bento__narrow { grid-column: span 3; }
  .bento > .bento__tall { grid-row: span 2; }
}

/* ---------- 10. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: .06em;
  text-decoration: none;
  cursor: pointer;
  transition: background-color .16s var(--ease), color .16s var(--ease),
              border-color .16s var(--ease), transform .16s var(--ease),
              box-shadow .16s var(--ease);
}
.btn__label { display: inline-block; }
.btn--ticket {
  background: var(--gold);
  color: var(--ink);
  border-color: var(--gold);
  box-shadow: 0 4px 12px rgba(245, 166, 35, .26);
}
.btn--ticket:hover {
  background: var(--gold-soft);
  border-color: var(--gold-soft);
  transform: translateY(-1px);
}
.btn--line {
  background: transparent;
  color: var(--ink);
  border-color: var(--mist);
}
.btn--line:hover { border-color: var(--gold); }
.btn--ghost {
  background: transparent;
  color: var(--cloud);
  border-color: rgba(247, 244, 238, .34);
}
.btn--ghost:hover { border-color: var(--gold); color: var(--gold-soft); }

/* ---------- 11. 入口票根卡 ---------- */
.ticket {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 22px 22px 20px;
  border: 1px solid var(--mist);
  border-radius: var(--radius);
  background: var(--cloud);
  color: var(--space);
  text-decoration: none;
  box-shadow: var(--shadow);
  transition: transform .16s var(--ease), border-color .16s var(--ease), box-shadow .16s var(--ease);
}
.ticket:hover {
  transform: translateY(-2px);
  border-color: var(--gold);
  box-shadow: 0 12px 12px rgba(14, 27, 44, .12);
}
.ticket__no {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .22em;
  color: var(--jade-deep);
}
.ticket__no::after {
  content: "";
  flex: 1 1 auto;
  height: 1px;
  background: repeating-linear-gradient(to right, var(--mist) 0 6px, transparent 6px 12px);
}
.ticket__title {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: .04em;
  color: var(--ink);
  line-height: 1.4;
}
.ticket__text { font-size: 14px; line-height: 1.75; color: rgba(14, 27, 44, .74); }
.ticket__meta {
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px dashed var(--mist);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--jade-deep);
}
.section--space .ticket { background: var(--space-2); border-color: rgba(247, 244, 238, .16); color: var(--cloud); }
.section--space .ticket__title { color: var(--cloud); }
.section--space .ticket__text { color: rgba(247, 244, 238, .74); }
.section--space .ticket:hover { border-color: var(--gold); }

/* ---------- 12. 展览说明牌 ---------- */
.plaque {
  display: grid;
  gap: 4px;
  padding: 14px 16px;
  border: 1px solid var(--mist);
  border-left: 3px solid var(--gold);
  border-radius: 10px;
  background: #fff;
}
.plaque__label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--jade-deep);
}
.plaque__value {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: .04em;
  color: var(--ink);
}

/* ---------- 13. 筛选芯片 ---------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 15px;
  border: 1px solid var(--mist);
  border-radius: 999px;
  background: #fff;
  color: var(--space);
  font-size: 13px;
  letter-spacing: .06em;
  cursor: pointer;
  transition: background-color .16s var(--ease), border-color .16s var(--ease), color .16s var(--ease);
}
.chip:hover { border-color: var(--gold); }
.chip[aria-pressed="true"] {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--ink);
  font-weight: 700;
}

/* ---------- 14. 折叠面板 ---------- */
.accordion { display: flex; flex-direction: column; border-top: 1px solid var(--mist); }
.accordion__item { border-bottom: 1px solid var(--mist); }
.accordion__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  padding: 18px 2px;
  text-align: left;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .03em;
  color: var(--ink);
  cursor: pointer;
  transition: color .16s var(--ease);
}
.accordion__trigger:hover { color: var(--jade-deep); }
.accordion__icon {
  position: relative;
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  border: 1px solid var(--mist);
  border-radius: 50%;
  transition: background-color .16s var(--ease), border-color .16s var(--ease);
}
.accordion__icon::before,
.accordion__icon::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 8px;
  height: 1.5px;
  background: var(--space);
  transform: translate(-50%, -50%);
  transition: transform .22s var(--ease), background-color .16s var(--ease);
}
.accordion__icon::after { transform: translate(-50%, -50%) rotate(90deg); }
.accordion__item[data-open] .accordion__icon { background: var(--gold); border-color: var(--gold); }
.accordion__item[data-open] .accordion__icon::before,
.accordion__item[data-open] .accordion__icon::after { background: var(--ink); }
.accordion__item[data-open] .accordion__icon::after { transform: translate(-50%, -50%) rotate(0deg); }
.accordion__panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows .22s var(--ease);
}
.accordion__item[data-open] .accordion__panel { grid-template-rows: 1fr; }
.accordion__body { min-height: 0; overflow: hidden; font-size: 15px; line-height: 1.8; color: rgba(14, 27, 44, .78); }
.accordion__body > * { margin: 0 0 18px; }
.accordion__body > *:last-child { margin-bottom: 20px; }

/* ---------- 15. 图片容器 ---------- */
.frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--mist);
  border-radius: var(--radius);
  isolation: isolate;
  background:
    radial-gradient(120% 80% at 16% 6%, rgba(245, 166, 35, .5), transparent 62%),
    radial-gradient(90% 70% at 90% 94%, rgba(60, 185, 160, .36), transparent 60%),
    linear-gradient(155deg, var(--space), var(--space-2) 58%, #22405C);
}
.frame img, .frame svg, .frame video { width: 100%; height: 100%; object-fit: cover; }
.frame--square { aspect-ratio: 1 / 1; }
.frame--tall { aspect-ratio: 3 / 4; }
.frame--wide { aspect-ratio: 21 / 9; }
.frame__tag {
  position: absolute;
  left: 14px;
  bottom: 14px;
  z-index: 2;
  padding: 6px 12px;
  border: 1px solid rgba(247, 244, 238, .24);
  border-radius: 999px;
  background: rgba(7, 17, 28, .72);
  color: var(--cloud);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .18em;
}

/* ---------- 16. 面包屑 ---------- */
.breadcrumb {
  margin-bottom: 20px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--jade-deep);
}
.breadcrumb__list { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.breadcrumb__item { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumb__item:not(:first-child)::before { content: "/"; color: var(--mist); }
.breadcrumb__link {
  color: var(--jade-deep);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}
.breadcrumb__link:hover { color: var(--gold); border-bottom-color: currentColor; }
.breadcrumb__current { color: var(--space); }

/* ---------- 17. 减少动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .site-nav { transition: none; }
  .ticket:hover { transform: none; }
  .btn--ticket:hover { transform: none; }
}