/* ============================================================
   九博体育中心 · /assets/site.css
   蓝图网格框架 · 深空蓝 / 霓虹青 / 珠宝色分区
   ============================================================ */

/* ---------- 1. RESET ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; }
h1, h2, h3, h4, h5, p, ul, ol, li, figure, blockquote, dl, dd { margin: 0; padding: 0; }
ul, ol { list-style: none; }
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }

/* ---------- 2. TOKENS ---------- */
:root {
  --ink: #050B1F;
  --ink-2: #0A142E;
  --zone-teal: #062F35;
  --zone-indigo: #1A1038;
  --zone-wine: #3B0E1F;
  --cyan: #00E5D0;
  --orange: #FF7A1A;
  --violet: #8B5CF6;
  --text: #E6EEFF;
  --text-2: #93A6C9;
  --line: #16305A;
  --line-2: #1E3E72;
  --r: 2px;
  --maxw: 1280px;
  --pad: clamp(18px, 3.4vw, 44px);
  --head-h: 132px;
  --font-head: "PingFang SC", "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-editorial: "Noto Serif SC", "Source Han Serif SC", "Songti SC", Georgia, serif;
  --font-mono: ui-monospace, "JetBrains Mono", "SFMono-Regular", Consolas, "Courier New", monospace;
}

/* ---------- 3. BASE / 中文排版 ---------- */
body {
  background-color: var(--ink);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  letter-spacing: 0.01em;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(22, 48, 90, 0.42) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(22, 48, 90, 0.42) 1px, transparent 1px);
  background-size: 88px 88px;
  -webkit-mask-image: radial-gradient(130% 90% at 72% 0%, #000 0%, rgba(0, 0, 0, 0.35) 58%, transparent 100%);
  mask-image: radial-gradient(130% 90% at 72% 0%, #000 0%, rgba(0, 0, 0, 0.35) 58%, transparent 100%);
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(60% 40% at 12% 8%, rgba(139, 92, 246, 0.16), transparent 70%),
    radial-gradient(50% 35% at 92% 22%, rgba(0, 229, 208, 0.12), transparent 72%),
    radial-gradient(40% 30% at 50% 100%, rgba(255, 122, 26, 0.08), transparent 70%);
}
body > * { position: relative; z-index: 1; }

.num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; letter-spacing: 0.02em; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
h1, h2, h3, h4 { font-family: var(--font-head); font-weight: 800; letter-spacing: -0.02em; line-height: 1.18; }
::selection { background: var(--cyan); color: #04121A; }

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

.skip-link {
  position: absolute; left: 16px; top: -70px; z-index: 200;
  padding: 10px 18px; background: var(--orange); color: #14060A;
  font-family: var(--font-head); font-weight: 800; font-size: 14px;
  border-radius: var(--r); transition: top 0.18s ease;
}
.skip-link:focus { top: 12px; }

/* ---------- 4. 头部框架 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: linear-gradient(180deg, rgba(5, 11, 31, 0.97), rgba(5, 11, 31, 0.9));
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.site-header[data-nav-open="true"] { border-bottom-color: var(--cyan); }

/* 坐标条 */
.coord-strip {
  display: flex;
  align-items: center;
  gap: 18px;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 7px var(--pad);
  max-height: 42px;
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-2);
  border-bottom: 1px solid rgba(22, 48, 90, 0.75);
  transition: max-height 0.22s ease, opacity 0.18s ease, padding 0.22s ease;
}
.coord-strip__item { white-space: nowrap; }
.coord-strip__item--mark { color: var(--cyan); }
.coord-strip__item--ver { color: var(--violet); }
.coord-strip__spacer { flex: 1 1 auto; }
.site-header[data-scrolled="true"] .coord-strip {
  max-height: 0; opacity: 0; padding-top: 0; padding-bottom: 0;
  border-bottom-color: transparent;
}

/* 桅杆：品牌 + 工具 */
.masthead {
  display: flex;
  align-items: center;
  gap: 20px;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 10px var(--pad);
  transition: padding 0.22s ease;
}
.brand { display: flex; align-items: center; gap: 12px; flex: 0 0 auto; }
.brand__glyph {
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border: 1px solid var(--cyan);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 18px; font-weight: 700;
  background: linear-gradient(140deg, rgba(0, 229, 208, 0.18), rgba(139, 92, 246, 0.14));
  transition: width 0.22s ease, height 0.22s ease, font-size 0.22s ease, background 0.16s ease;
}
.brand:hover .brand__glyph { background: linear-gradient(140deg, rgba(0, 229, 208, 0.32), rgba(255, 122, 26, 0.2)); }
.brand__text { display: block; }
.brand__name {
  display: block;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 20px;
  letter-spacing: -0.02em;
  line-height: 1.15;
}
.brand__sub {
  display: block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  color: var(--text-2);
}
.masthead__tools { margin-left: auto; display: flex; align-items: center; gap: 12px; }
.site-header[data-scrolled="true"] .masthead { padding-top: 6px; padding-bottom: 6px; }
.site-header[data-scrolled="true"] .brand__glyph { width: 32px; height: 32px; font-size: 15px; }
.site-header[data-scrolled="true"] .brand__sub { display: none; }

/* 搜索 */
.search { position: relative; }
.search__input {
  width: 186px;
  padding: 8px 12px 8px 32px;
  background: rgba(10, 20, 46, 0.92);
  border: 1px solid var(--line);
  border-radius: var(--r);
  color: var(--text);
  font-size: 14px;
  transition: border-color 0.14s ease, width 0.2s ease;
}
.search__input::placeholder { color: var(--text-2); }
.search__input:hover { border-color: var(--line-2); }
.search__input:focus { outline: none; border-color: var(--cyan); }
.search::before {
  content: ""; position: absolute; left: 11px; top: 50%;
  width: 9px; height: 9px; margin-top: -7px;
  border: 1px solid var(--text-2); border-radius: 50%;
  pointer-events: none;
}
.search::after {
  content: ""; position: absolute; left: 19px; top: 50%;
  width: 6px; height: 1px; background: var(--text-2);
  transform: rotate(45deg); pointer-events: none;
}

/* 按钮 */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 20px;
  border: 1px solid var(--line-2);
  border-radius: var(--r);
  background: rgba(10, 20, 46, 0.7);
  color: var(--text);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 15px;
  line-height: 1.2;
  transition: border-color 0.14s ease, background 0.14s ease, color 0.14s ease, transform 0.16s ease;
}
.btn:hover { border-color: var(--cyan); color: #fff; transform: translateY(-2px); }
.btn--primary {
  background: linear-gradient(120deg, var(--orange), #FF9A45);
  border-color: transparent;
  color: #150704;
}
.btn--primary:hover { background: linear-gradient(120deg, #FF8C33, #FFB169); border-color: transparent; color: #150704; }
.btn--ghost { background: transparent; border-color: var(--line); color: var(--text-2); }
.btn--ghost:hover { color: var(--text); }
.btn--sm { padding: 8px 14px; font-size: 14px; }
.btn--block { width: 100%; }

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 9px 13px;
  border: 1px solid var(--line-2);
  border-radius: var(--r);
  color: var(--text);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 14px;
  transition: border-color 0.14s ease, color 0.14s ease;
}
.nav-toggle:hover { border-color: var(--cyan); color: var(--cyan); }
.nav-toggle__bar { display: block; width: 16px; height: 1px; background: currentColor; }
.nav-toggle__label { line-height: 1; }

/* 第二栏：活动查询 */
.activity-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 8px var(--pad);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-2);
  border-top: 1px solid rgba(22, 48, 90, 0.75);
  background: linear-gradient(90deg, rgba(0, 229, 208, 0.12), rgba(139, 92, 246, 0.09) 42%, transparent 80%);
}
.activity-bar__dot {
  width: 8px; height: 8px; flex: 0 0 auto;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(0, 229, 208, 0.18);
  animation: statusPulse 2.8s ease-in-out infinite;
}
@keyframes statusPulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.32; } }
.activity-bar__link {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--cyan);
  border-bottom: 1px solid rgba(0, 229, 208, 0.5);
  transition: border-color 0.14s ease, color 0.14s ease;
}
.activity-bar__link:hover { border-bottom-color: var(--cyan); color: #7CFFF1; }
.activity-bar__note { opacity: 0.82; }
.activity-bar__spacer { flex: 1 1 auto; }
.activity-bar__meta { white-space: nowrap; }
.activity-bar__meta .num { color: var(--text); }

/* 栏目导航带 */
.frame-nav {
  display: flex;
  align-items: stretch;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--pad);
  border-top: 1px solid rgba(22, 48, 90, 0.75);
  border-bottom: 1px solid rgba(22, 48, 90, 0.75);
  background: linear-gradient(90deg, rgba(10, 20, 46, 0.85), rgba(10, 20, 46, 0.35) 70%, transparent);
}
.frame-nav__list { display: flex; align-items: stretch; flex-wrap: wrap; }
.frame-nav__link {
  position: relative;
  display: block;
  padding: 13px 18px;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 15px;
  color: var(--text-2);
  border-right: 1px solid rgba(22, 48, 90, 0.55);
  transition: color 0.14s ease, background 0.14s ease;
}
.frame-nav__link::after {
  content: "";
  position: absolute; left: 0; bottom: -1px;
  width: 0; height: 2px;
  background: var(--cyan);
  transition: width 0.16s ease;
}
.frame-nav__link:hover { color: var(--text); background: rgba(0, 229, 208, 0.06); }
.frame-nav__link:hover::after { width: 100%; }
.frame-nav__link[aria-current="page"] { color: var(--cyan); }
.frame-nav__link[aria-current="page"]::after { width: 100%; }
.frame-nav__meta {
  margin-left: auto;
  align-self: center;
  padding-left: 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--line-2);
  white-space: nowrap;
}

/* 滚动进度 */
.scroll-meter {
  position: absolute; left: 0; bottom: -1px;
  width: 0; height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--violet) 70%, var(--orange));
  transition: width 0.1s linear;
}

/* 移动底部索引坞 */
.mobile-dock { display: none; }

/* ---------- 5. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: 0;
  padding: 60px 0 0;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(6, 47, 53, 0.6), rgba(5, 11, 31, 1) 60%);
}
.footer-frame { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--pad); }
.footer-top {
  display: grid;
  grid-template-columns: minmax(240px, 1.1fr) 2.6fr;
  gap: 44px;
  padding-bottom: 42px;
  border-bottom: 1px solid var(--line);
}
.footer-brand__mark {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--cyan);
  text-transform: uppercase;
}
.footer-brand__line {
  margin-top: 10px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 22px;
  letter-spacing: -0.02em;
  line-height: 1.4;
}
.footer-brand__note { margin-top: 12px; font-size: 14px; color: var(--text-2); max-width: 34ch; }
.footer-cols { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.footer-col__title {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.16em;
  color: var(--text-2);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 12px;
}
.footer-col__list li + li { margin-top: 4px; }
.footer-col__list a {
  position: relative;
  display: inline-block;
  padding: 3px 0;
  font-size: 15px;
  color: var(--text);
  transition: color 0.14s ease, padding-left 0.16s ease;
}
.footer-col__list a::before {
  content: "";
  position: absolute; left: 0; bottom: 3px;
  width: 0; height: 1px;
  background: var(--cyan);
  transition: width 0.16s ease;
}
.footer-col__list a:hover { color: var(--cyan); padding-left: 3px; }
.footer-col__list a:hover::before { width: 100%; }

.footer-contact {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}
.footer-contact__item { display: flex; flex-wrap: wrap; align-items: baseline; gap: 8px 12px; }
.footer-contact__item--wide { grid-column: 1 / -1; }
.footer-contact__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--text-2);
  text-transform: uppercase;
}
.footer-contact__v { font-size: 15px; color: var(--text); }
.footer-contact__v.num { font-size: 14px; }
.footer-contact__note { grid-column: 1 / -1; font-size: 13px; color: var(--text-2); }
.copy-btn {
  padding: 4px 10px;
  border: 1px solid var(--line-2);
  border-radius: var(--r);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--text-2);
  transition: border-color 0.14s ease, color 0.14s ease, background 0.14s ease;
}
.copy-btn:hover { border-color: var(--cyan); color: var(--cyan); }
.copy-btn[data-copied="true"] { border-color: var(--orange); color: var(--orange); }
.copy-note { font-family: var(--font-mono); font-size: 11px; color: var(--cyan); }

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 24px;
  padding: 20px 0 28px;
}
.footer-legal__line { font-size: 12.5px; color: var(--text-2); }
.footer-legal__line .num { color: var(--text-2); }
.footer-legal__links { display: flex; flex-wrap: wrap; gap: 18px; margin-left: auto; }
.footer-legal__links a {
  font-size: 13px;
  color: var(--text-2);
  border-bottom: 1px solid transparent;
  transition: color 0.14s ease, border-color 0.14s ease;
}
.footer-legal__links a:hover { color: var(--cyan); border-bottom-color: var(--cyan); }

/* ---------- 6. 页面通用容器与网格 ---------- */
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 var(--pad); }
.grid-12 { display: grid; grid-template-columns: repeat(12, 1fr); gap: 24px; }
.col-main { grid-column: span 7; }
.col-side { grid-column: span 4; }
.col-full { grid-column: 1 / -1; }

.breadcrumb { padding-top: 22px; font-family: var(--font-mono); font-size: 12px; color: var(--text-2); }
.breadcrumb__list { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.breadcrumb__list li + li::before { content: "/"; margin-right: 8px; color: var(--line-2); }
.breadcrumb a { transition: color 0.14s ease; }
.breadcrumb a:hover { color: var(--cyan); }

/* 分区 */
.zone { position: relative; padding: clamp(48px, 7vw, 100px) 0; border-top: 1px solid var(--line); }
.zone--ink { background: var(--ink); }
.zone--blueprint {
  background-color: var(--ink-2);
  background-image:
    linear-gradient(to right, rgba(22, 48, 90, 0.5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(22, 48, 90, 0.5) 1px, transparent 1px);
  background-size: 64px 64px;
}
.zone--teal { background: linear-gradient(180deg, var(--zone-teal), #04191E); border-top-color: rgba(0, 229, 208, 0.24); }
.zone--indigo { background: linear-gradient(180deg, var(--zone-indigo), #0C0722); border-top-color: rgba(139, 92, 246, 0.3); }
.zone--wine { background: linear-gradient(180deg, var(--zone-wine), #22070F); border-top-color: rgba(255, 122, 26, 0.26); }
.zone--slash { clip-path: polygon(0 4vw, 100% 0, 100% 100%, 0 100%); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 18px;
  padding-bottom: 16px;
  margin-bottom: 30px;
  border-bottom: 1px solid var(--line);
}
.section-head__idx { font-family: var(--font-mono); font-size: 13px; letter-spacing: 0.14em; color: var(--cyan); }
.section-head__title { font-size: clamp(26px, 3.4vw, 40px); }
.section-head__note { margin-left: auto; font-family: var(--font-mono); font-size: 12px; color: var(--text-2); }

.eyebrow { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.24em; text-transform: uppercase; color: var(--cyan); }
.lead {
  font-family: var(--font-editorial);
  font-size: clamp(17px, 1.7vw, 21px);
  line-height: 1.75;
  color: #C9D8F5;
  max-width: 46ch;
}
.rule { height: 1px; background: var(--line); border: 0; margin: 32px 0; }

.prose { max-width: 720px; font-size: 16px; line-height: 1.75; }
.prose p + p { margin-top: 16px; }
.prose h3 { font-size: 26px; margin: 34px 0 12px; }
.prose strong { color: #fff; font-weight: 700; }
.prose ul, .prose ol { margin: 14px 0; }
.prose li { position: relative; padding-left: 28px; margin-bottom: 8px; }
.prose li::before {
  content: ""; position: absolute; left: 0; top: 0.85em;
  width: 12px; height: 1px; background: var(--cyan);
}
.prose ol { counter-reset: pcount; }
.prose ol li { counter-increment: pcount; }
.prose ol li::before {
  content: counter(pcount, decimal-leading-zero);
  top: 0; width: auto; height: auto; background: none;
  font-family: var(--font-mono); font-size: 12px; color: var(--cyan); letter-spacing: 0.04em;
}

/* ---------- 7. 组件 ---------- */
.panel {
  position: relative;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: linear-gradient(150deg, rgba(10, 20, 46, 0.92), rgba(26, 16, 56, 0.6));
  transition: transform 0.16s ease, border-color 0.16s ease;
}
.panel:hover { transform: translateY(-2px); border-color: var(--cyan); }
.panel--flat:hover { transform: none; }
.panel__idx { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.14em; color: var(--cyan); }
.panel__title { font-family: var(--font-head); font-weight: 800; font-size: 20px; margin: 8px 0 10px; }
.panel__text { font-size: 15px; color: var(--text-2); }
.panel-stack { position: relative; display: grid; gap: 20px; }
.panel-stack--offset > *:nth-child(2) { margin-top: -22px; margin-left: 6%; }
.lift { box-shadow: 0 26px 60px -32px rgba(0, 0, 0, 0.95); }

.tag {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 3px 10px;
  border: 1px solid var(--line-2);
  border-radius: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-2);
}
.tag--cyan { color: var(--cyan); border-color: rgba(0, 229, 208, 0.5); }
.tag--violet { color: var(--violet); border-color: rgba(139, 92, 246, 0.55); }
.tag--orange { color: var(--orange); border-color: rgba(255, 122, 26, 0.55); }

.table-scroll { overflow-x: auto; border: 1px solid var(--line); }
.spec-table { min-width: 560px; font-size: 15px; }
.spec-table caption {
  text-align: left; padding: 12px 14px;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.12em; color: var(--text-2);
  border-bottom: 1px solid var(--line);
}
.spec-table th, .spec-table td { padding: 12px 16px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); }
.spec-table th {
  font-family: var(--font-head); font-weight: 700; font-size: 14px; color: var(--text);
  background: rgba(10, 20, 46, 0.9); white-space: nowrap;
}
.spec-table td { color: var(--text-2); }
.spec-table td.num { font-family: var(--font-mono); color: var(--text); }
.spec-table tbody tr { transition: background 0.14s ease; }
.spec-table tbody tr:hover { background: rgba(0, 229, 208, 0.06); }
.spec-table tbody tr:last-child td { border-bottom: 0; }

.index-list { display: flex; flex-direction: column; border-top: 1px solid var(--line); }
.index-list__link {
  display: flex; align-items: baseline; gap: 12px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
  color: var(--text-2);
  transition: color 0.14s ease, padding-left 0.16s ease;
}
.index-list__link:hover { color: var(--text); padding-left: 4px; }
.index-list__link[aria-current="true"] { color: var(--cyan); }
.index-list__num { font-family: var(--font-mono); font-size: 12px; color: var(--cyan); }
.sticky-index { position: sticky; top: calc(var(--head-h) + 24px); }

.accordion { border-top: 1px solid var(--line); }
.accordion__item { border-bottom: 1px solid var(--line); }
.accordion__trigger {
  display: flex; align-items: center; gap: 14px;
  width: 100%;
  padding: 18px 0;
  text-align: left;
  font-family: var(--font-head); font-weight: 700; font-size: 17px; color: var(--text);
  transition: color 0.14s ease;
}
.accordion__trigger:hover { color: var(--cyan); }
.accordion__trigger::after {
  content: "+"; margin-left: auto;
  font-family: var(--font-mono); color: var(--cyan); font-size: 18px;
}
.accordion__item[data-open="true"] .accordion__trigger::after { content: "–"; }
.accordion__panel {
  max-height: 0; overflow: hidden;
  color: var(--text-2); font-size: 15px;
  transition: max-height 0.22s ease;
}
.accordion__panel > div { padding: 0 0 20px; max-width: 720px; }

.kpi { display: flex; flex-direction: column; gap: 6px; padding: 18px; border-left: 2px solid var(--cyan); background: linear-gradient(90deg, rgba(0, 229, 208, 0.09), transparent); }
.kpi__value { font-family: var(--font-mono); font-size: 28px; letter-spacing: -0.02em; color: var(--text); }
.kpi__label { font-size: 13px; color: var(--text-2); }

/* 图片容器（供页面阶段使用） */
.figure { position: relative; margin: 0; border: 1px solid var(--line); background: var(--ink-2); overflow: hidden; }
.figure__media {
  position: relative;
  aspect-ratio: 16 / 9;
  display: grid; place-items: center;
  background:
    linear-gradient(135deg, rgba(0, 229, 208, 0.16), rgba(139, 92, 246, 0.16) 58%, rgba(255, 122, 26, 0.12)),
    repeating-linear-gradient(90deg, rgba(22, 48, 90, 0.65) 0 1px, transparent 1px 48px),
    repeating-linear-gradient(0deg, rgba(22, 48, 90, 0.65) 0 1px, transparent 1px 48px),
    var(--ink-2);
}
.figure__media img { width: 100%; height: 100%; object-fit: cover; }
.figure__caption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-2);
}
.figure--wide .figure__media { aspect-ratio: 21 / 9; }
.figure--tall .figure__media { aspect-ratio: 4 / 5; }

/* 显现动画 */
html.js [data-reveal] { opacity: 0; transform: translateY(10px); transition: opacity 0.42s ease, transform 0.42s ease; }
html.js [data-reveal].is-visible { opacity: 1; transform: none; }

/* ---------- 8. 响应式 ---------- */
@media (max-width: 1080px) {
  .footer-top { grid-template-columns: 1fr; gap: 32px; }
  .col-main, .col-side { grid-column: 1 / -1; }
  .sticky-index { position: static; }
}

@media (max-width: 900px) {
  :root { --head-h: 96px; }
  body { padding-bottom: 62px; }

  .nav-toggle { display: inline-flex; }
  .frame-nav {
    position: absolute;
    left: 0; right: 0; top: 100%;
    display: block;
    max-width: none;
    padding: 0;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    background: linear-gradient(180deg, rgba(6, 14, 34, 0.99), rgba(5, 11, 31, 0.99));
    transition: max-height 0.26s ease, opacity 0.2s ease, visibility 0.2s;
  }
  .frame-nav[data-open="true"] { max-height: min(72vh, 520px); overflow-y: auto; opacity: 1; visibility: visible; }
  .frame-nav__list { display: block; }
  .frame-nav__link {
    padding: 15px var(--pad);
    border-right: 0;
    border-bottom: 1px solid rgba(22, 48, 90, 0.6);
    font-size: 16px;
  }
  .frame-nav__meta {
    display: block;
    margin: 0;
    padding: 12px var(--pad) 16px;
    border-top: 1px solid rgba(22, 48, 90, 0.6);
  }

  .grid-12 { grid-template-columns: repeat(6, 1fr); gap: 20px; }
  .col-main, .col-side { grid-column: 1 / -1; }
  .section-head__note { margin-left: 0; width: 100%; }
  .panel-stack--offset > *:nth-child(2) { margin: 0; }

  .mobile-dock {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    position: fixed;
    left: 0; right: 0; bottom: 0;
    z-index: 70;
    padding-bottom: env(safe-area-inset-bottom);
    border-top: 1px solid var(--line-2);
    background: linear-gradient(180deg, rgba(6, 14, 34, 0.95), rgba(5, 11, 31, 0.99));
    backdrop-filter: blur(12px);
  }
  .mobile-dock__link {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1px;
    padding: 9px 2px 8px;
    border-right: 1px solid rgba(22, 48, 90, 0.55);
    color: var(--text-2);
    font-size: 12px;
    line-height: 1.4;
    transition: color 0.14s ease, background 0.14s ease;
  }
  .mobile-dock__link:last-child { border-right: 0; }
  .mobile-dock__link:hover, .mobile-dock__link:active { color: var(--cyan); background: rgba(0, 229, 208, 0.08); }
  .mobile-dock__idx { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.1em; color: var(--cyan); }
  .mobile-dock__text { font-family: var(--font-head); font-weight: 700; }

  .footer-cols { grid-template-columns: repeat(2, 1fr); gap: 26px; }
  .footer-legal__links { margin-left: 0; }
}

@media (max-width: 700px) {
  .coord-strip { display: none; }
  .activity-bar__note { display: none; }
  .activity-bar { justify-content: space-between; }
  .masthead { gap: 12px; padding-top: 9px; padding-bottom: 9px; }
  .brand__glyph { width: 34px; height: 34px; font-size: 16px; }
  .brand__name { font-size: 18px; }
  .brand__sub { display: none; }
  .zone--slash { clip-path: none; }
  .lead { max-width: none; }
}

@media (max-width: 560px) {
  .search { display: none; }
  .btn--sm { padding: 8px 12px; font-size: 13px; }
  .footer-cols { grid-template-columns: 1fr; }
  .footer-brand__line { font-size: 20px; }
}

/* ---------- 9. 无障碍偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  html.js [data-reveal] { opacity: 1; transform: none; }
  .activity-bar__dot { animation: none; }
  .panel:hover, .btn:hover { transform: none; }
}