/* ==========================================================================
   华体育CN · 共享样式表  /assets/site.css
   夜间赛场指挥中心：暗夜蓝基底 + 暖纸档案 + 荧光青 / 琥珀橙数据高亮
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 104px;
}

body, h1, h2, h3, h4, h5, h6, p, ul, ol, li, figure, blockquote, dl, dd, pre { margin: 0; }
ul, ol { padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
img, svg, video { display: block; max-width: 100%; }
table { border-collapse: collapse; width: 100%; }
hr { border: 0; border-top: 1px solid rgba(169, 183, 181, .2); }

/* ---------- 2. 变量 ---------- */
:root {
  --night:    #071A2B;
  --deep:     #0E2233;
  --paper:    #F2E8D5;
  --teal:     #0F7B6C;
  --cyan:     #3DF5D4;
  --amber:    #FFB347;
  --moss:     #1F5F4B;
  --mist:     #A9B7B5;
  --electric: #2D9CDB;
  --bronze:   #C9893B;

  --ink:      #E9F2F0;
  --ink-soft: #B6C6C3;
  --ink-dim:  #7E928F;
  --on-paper: #2C4149;

  --font-head: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --shell: 1280px;
  --gutter: clamp(16px, 4vw, 48px);

  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 22px;

  --line: rgba(61, 245, 212, .16);
  --line-soft: rgba(169, 183, 181, .18);
  --line-amber: rgba(255, 179, 71, .38);

  --shadow-lift: 0 20px 44px -24px rgba(0, 0, 0, .88);
  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  background: var(--night);
  color: var(--ink-soft);
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: .005em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--ink);
  font-family: var(--font-head);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -.02em;
}
h1 { font-size: clamp(2rem, 5.2vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3.2vw, 2.1rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.4rem); letter-spacing: -.012em; }
h4 { font-size: 1.05rem; letter-spacing: 0; line-height: 1.35; }

p { max-width: 42em; }

.num,
.stat__value,
[data-num] {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  letter-spacing: -.03em;
}

/* ---------- 4. 焦点与无障碍 ---------- */
:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}
a:focus-visible,
button:focus-visible { border-radius: 8px; }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- 5. 布局容器 ---------- */
.container {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container--wide { max-width: 1480px; }

.section { padding-block: clamp(48px, 7vw, 110px); }
.section--tight { padding-block: clamp(28px, 4vw, 56px); }
.section--paper {
  background: var(--paper);
  color: var(--on-paper);
}
.section--paper h1,
.section--paper h2,
.section--paper h3,
.section--paper h4 { color: var(--deep); }
.section--paper .eyebrow { color: var(--teal); }
.section--paper .eyebrow::before { background: var(--bronze); }

.grid { display: grid; gap: clamp(16px, 2.4vw, 28px); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); }

.bevel {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

/* ---------- 6. 章节标题与标签 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .6em;
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cyan);
}
.eyebrow::before {
  content: "";
  width: 24px;
  height: 2px;
  background: var(--amber);
  flex: 0 0 auto;
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px 32px;
  margin-bottom: clamp(20px, 3vw, 38px);
}
.section-head__title { font-size: clamp(1.4rem, 3vw, 2rem); }
.section-head__desc {
  font-size: .86rem;
  color: var(--ink-dim);
  max-width: 34em;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(61, 245, 212, .08);
  color: var(--cyan);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .04em;
  white-space: nowrap;
}
.tag--amber {
  color: var(--amber);
  border-color: var(--line-amber);
  background: rgba(255, 179, 71, .1);
}

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .6em;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: 10px;
  font-family: var(--font-head);
  font-size: .9rem;
  font-weight: 800;
  letter-spacing: .02em;
  line-height: 1.2;
  cursor: pointer;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: transform .18s var(--ease), background-color .18s var(--ease),
              color .18s var(--ease), border-color .18s var(--ease),
              box-shadow .18s var(--ease);
}
.btn--amber { background: var(--amber); color: var(--night); }
.btn--amber:hover {
  background: #FFC978;
  transform: translateY(-2px);
  box-shadow: 0 14px 28px -16px rgba(255, 179, 71, .95);
}
.btn--cyan { background: var(--cyan); color: var(--night); }
.btn--cyan:hover { background: #74FAE2; transform: translateY(-2px); }
.btn--ghost {
  background: rgba(15, 123, 108, .14);
  border-color: var(--line);
  color: var(--ink);
}
.btn--ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  transform: translateY(-2px);
}
.btn--paper { background: var(--paper); color: var(--deep); }
.btn--paper:hover { background: #FFF6E4; transform: translateY(-2px); }

/* ---------- 8. 跳转链接 ---------- */
.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -72px;
  z-index: 200;
  padding: 10px 20px;
  background: var(--cyan);
  color: var(--night);
  font-size: .84rem;
  font-weight: 900;
  letter-spacing: .04em;
  border-radius: 0 0 10px 10px;
  transition: top .2s var(--ease);
}
.skip-link:focus { top: 0; }

/* ---------- 9. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 120;
  background: var(--night);
}

/* 9.1 上层状态带 */
.deck-bar {
  background: var(--deep);
  border-bottom: 1px solid rgba(45, 156, 219, .2);
  overflow: hidden;
  max-height: 160px;
  transition: max-height .3s var(--ease), opacity .2s linear;
}
.site-header[data-condensed="true"] .deck-bar {
  max-height: 0;
  opacity: 0;
}
.deck-bar__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 28px;
  padding-block: 10px;
}
.deck-brand {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 16px;
  min-width: 0;
  max-width: none;
}
.deck-brand__line {
  position: relative;
  padding-left: 14px;
  font-size: .86rem;
  font-weight: 900;
  letter-spacing: .02em;
  color: var(--ink);
}
.deck-brand__line::before {
  content: "";
  position: absolute;
  left: 0;
  top: .28em;
  bottom: .28em;
  width: 3px;
  background: var(--cyan);
}
.deck-brand__tagline {
  font-size: .76rem;
  line-height: 1.5;
  color: var(--ink-dim);
  max-width: none;
}
.deck-stage {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.deck-stage__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 13px 5px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(15, 123, 108, .14);
  font-size: .74rem;
  color: var(--ink-soft);
  white-space: nowrap;
}
.deck-stage__dot {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--cyan);
  animation: hs-pulse 2.6s var(--ease) infinite;
}
.deck-stage__item:nth-child(2) .deck-stage__dot { background: var(--amber); }
.deck-stage__item:nth-child(3) .deck-stage__dot { background: var(--electric); }
@keyframes hs-pulse {
  0%   { box-shadow: 0 0 0 0 rgba(61, 245, 212, .55); }
  70%  { box-shadow: 0 0 0 7px rgba(61, 245, 212, 0); }
  100% { box-shadow: 0 0 0 0 rgba(61, 245, 212, 0); }
}
.deck-stage__label { line-height: 1.2; }

/* 9.2 下层主导航 */
.masthead {
  position: relative;
  background: rgba(7, 26, 43, .96);
  border-bottom: 1px solid var(--line);
}
.masthead::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan) 24%, var(--amber) 72%, transparent);
  opacity: .55;
  pointer-events: none;
}
.masthead__inner {
  display: flex;
  align-items: center;
  gap: clamp(10px, 2.4vw, 36px);
  min-height: 68px;
  padding-block: 10px;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  padding: 4px;
  margin: -4px;
}
.wordmark__glyph {
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--cyan), var(--teal));
  color: var(--night);
  font-size: 1.15rem;
  font-weight: 900;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
}
.wordmark__text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.wordmark__cn {
  font-size: 1.06rem;
  font-weight: 900;
  letter-spacing: -.01em;
  color: var(--ink);
}
.wordmark__sub {
  font-family: var(--font-mono);
  font-size: .62rem;
  letter-spacing: .08em;
  color: var(--ink-dim);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  padding: 9px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(15, 123, 108, .16);
  color: var(--ink);
  font-size: .82rem;
  font-weight: 800;
  letter-spacing: .04em;
}
.nav-toggle__bars {
  display: grid;
  gap: 4px;
  width: 18px;
}
.nav-toggle__bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--cyan);
  transition: transform .22s var(--ease), opacity .16s linear;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
.nav-toggle__label { line-height: 1; }

.primary-nav { margin-left: auto; }
.primary-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(2px, .5vw, 8px);
}
.primary-nav__item { display: block; }
.primary-nav__link {
  position: relative;
  display: block;
  padding: 9px 12px;
  border-radius: 8px;
  color: var(--ink-soft);
  font-size: .9rem;
  font-weight: 700;
  letter-spacing: .01em;
  white-space: nowrap;
  transition: color .18s var(--ease), background-color .18s var(--ease), transform .18s var(--ease);
}
.primary-nav__link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 3px;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .22s var(--ease);
}
.primary-nav__link:hover {
  color: var(--ink);
  background: rgba(61, 245, 212, .09);
  transform: translateY(-1px);
}
.primary-nav__link:hover::after { transform: scaleX(1); }
.primary-nav__link[aria-current="page"] {
  background: var(--amber);
  color: var(--night);
  font-weight: 900;
}
.primary-nav__link[aria-current="page"]::after { transform: scaleX(0); }

/* ---------- 10. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(40px, 7vw, 96px);
  padding-top: clamp(40px, 6vw, 72px);
  background: var(--deep);
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--teal) 42%, var(--amber));
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1.55fr) minmax(0, 1fr);
  gap: clamp(28px, 4vw, 48px);
  padding-bottom: clamp(32px, 5vw, 56px);
}

.footer-brand__line {
  max-width: none;
  font-size: 1.05rem;
  font-weight: 900;
  letter-spacing: -.01em;
  line-height: 1.35;
  color: var(--ink);
}
.footer-brand__note {
  margin-top: 10px;
  max-width: 26em;
  font-size: .84rem;
  line-height: 1.7;
  color: var(--ink-dim);
}
.footer-brand .btn { margin-top: 18px; }

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 34px);
}
.footer-group { min-width: 0; }
.footer-group__title {
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--cyan);
  line-height: 1.4;
}
.footer-group__list { display: grid; gap: 8px; }
.footer-group__link {
  display: inline-block;
  font-size: .9rem;
  color: var(--ink-soft);
  transition: color .18s var(--ease), transform .18s var(--ease);
}
.footer-group__link:hover {
  color: var(--amber);
  transform: translateX(4px);
}

.footer-contact { min-width: 0; }
.footer-contact__list { display: grid; gap: 12px; }
.footer-contact__row { display: flex; flex-direction: column; gap: 2px; }
.footer-contact__label {
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-dim);
}
.footer-contact__value {
  font-size: .86rem;
  line-height: 1.6;
  color: var(--ink);
  overflow-wrap: anywhere;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  padding-block: 18px 26px;
  border-top: 1px solid var(--line-soft);
  font-size: .78rem;
  color: var(--ink-dim);
}
.footer-bottom__legal { max-width: none; letter-spacing: .02em; }
.footer-bottom__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 18px;
  max-width: none;
}

/* ---------- 11. 面包屑 ---------- */
.breadcrumb {
  padding-block: 16px 4px;
  font-size: .78rem;
  color: var(--ink-dim);
}
.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 10px;
}
.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.breadcrumb__item::after {
  content: "/";
  color: rgba(169, 183, 181, .4);
}
.breadcrumb__item:last-child::after { display: none; }
.breadcrumb__link { color: var(--ink-soft); transition: color .18s var(--ease); }
.breadcrumb__link:hover { color: var(--cyan); }
.breadcrumb__current { color: var(--cyan); font-weight: 700; }

/* ---------- 12. 面板 / 档案卡 / 统计 ---------- */
.panel {
  padding: clamp(18px, 2.6vw, 28px);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(160deg, rgba(14, 34, 51, .96), rgba(7, 26, 43, .92));
}
.panel--teal {
  border-color: rgba(61, 245, 212, .3);
  background: linear-gradient(150deg, rgba(15, 123, 108, .42), rgba(7, 26, 43, .92));
}

.archive-card {
  position: relative;
  padding: clamp(20px, 3vw, 34px);
  border-radius: var(--r-md);
  background: var(--paper);
  color: var(--on-paper);
  box-shadow: var(--shadow-lift);
}
.archive-card h1,
.archive-card h2,
.archive-card h3,
.archive-card h4 { color: var(--deep); }
.archive-card p { color: var(--on-paper); }
.archive-card__index {
  position: absolute;
  top: 14px;
  right: 18px;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .16em;
  color: var(--bronze);
}

.stat {
  display: grid;
  gap: 4px;
  min-width: 0;
}
.stat__label {
  font-family: var(--font-mono);
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mist);
}
.stat__value {
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1;
  color: var(--cyan);
  overflow-wrap: anywhere;
}
.stat__value--amber { color: var(--amber); }
.stat__value--paper { color: var(--paper); }
.stat__note {
  font-size: .78rem;
  line-height: 1.6;
  color: var(--ink-dim);
}

/* ---------- 13. 密集索引表 ---------- */
.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(14, 34, 51, .55);
}
.index-table { min-width: 560px; font-size: .88rem; }
.index-table th {
  padding: 11px 14px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--mist);
  white-space: nowrap;
  border-bottom: 1px solid var(--line);
}
.index-table td {
  padding: 12px 14px;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--line-soft);
  vertical-align: middle;
}
.index-table tbody tr { transition: background-color .16s var(--ease); }
.index-table tbody tr:last-child td { border-bottom: 0; }
.index-table tbody tr:hover { background: rgba(15, 123, 108, .24); }
.index-table tbody tr:hover td { color: var(--ink); }
.index-table td.num {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--ink);
}

/* ---------- 14. 媒体容器（供页面阶段放置图片） ---------- */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: var(--r-md);
  background:
    linear-gradient(150deg, rgba(15, 123, 108, .38), rgba(7, 26, 43, .92) 62%),
    var(--deep);
  isolation: isolate;
}
.media-frame img,
.media-frame video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, rgba(61, 245, 212, .07) 0 1px, transparent 1px 48px),
    repeating-linear-gradient(0deg, rgba(61, 245, 212, .07) 0 1px, transparent 1px 48px);
  mix-blend-mode: screen;
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--bevel {
  border-radius: 0;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}
.media-frame__caption {
  margin-top: 8px;
  font-size: .75rem;
  line-height: 1.6;
  color: var(--ink-dim);
}

/* ---------- 15. 长文阅读区 ---------- */
.prose { max-width: 38em; }
.prose > * + * { margin-top: 1.1em; }
.prose h2 { margin-top: 1.8em; }
.prose h3 { margin-top: 1.5em; }
.prose ul,
.prose ol { padding-left: 1.25em; }
.prose ul { list-style: square; }
.prose ol { list-style: decimal; }
.prose li + li { margin-top: .4em; }
.prose strong { color: var(--ink); font-weight: 800; }
.prose a,
.link {
  color: var(--cyan);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color .18s var(--ease);
}
.prose a:hover,
.link:hover { color: var(--amber); }
.prose blockquote {
  padding: 4px 0 4px 18px;
  border-left: 3px solid var(--amber);
  color: var(--ink-soft);
}

/* ---------- 16. 滚动进度与返回顶部（由 JS 注入） ---------- */
.scroll-progress {
  position: fixed;
  left: 0;
  right: 0;
  top: 0;
  height: 3px;
  z-index: 200;
  pointer-events: none;
  background: transparent;
}
.scroll-progress__bar {
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--teal), var(--cyan) 55%, var(--amber));
  box-shadow: 0 0 12px rgba(61, 245, 212, .5);
  transition: width .1s linear;
}

.to-top {
  position: fixed;
  right: clamp(14px, 3vw, 32px);
  bottom: clamp(14px, 3vw, 32px);
  z-index: 150;
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--deep);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: .8rem;
  font-weight: 700;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity .22s var(--ease), transform .22s var(--ease),
              visibility .22s linear, border-color .18s var(--ease),
              background-color .18s var(--ease);
}
.to-top[data-visible="true"] {
  opacity: 1;
  visibility: visible;
  transform: none;
}
.to-top:hover {
  border-color: var(--cyan);
  background: rgba(15, 123, 108, .32);
}

/* ---------- 17. 滚动显现协议 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .5s var(--ease), transform .5s var(--ease);
}
[data-reveal][data-revealed="true"] {
  opacity: 1;
  transform: none;
}

/* ---------- 18. 响应式 ---------- */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-contact { grid-column: 1 / -1; }
}

@media (max-width: 1023px) {
  html { scroll-padding-top: 84px; }

  .nav-toggle { display: inline-flex; }

  .primary-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    z-index: 10;
    display: none;
    margin-left: 0;
    max-height: min(72vh, 560px);
    overflow-y: auto;
    padding: 10px var(--gutter) 20px;
    background: var(--deep);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-lift);
  }
  .primary-nav[data-open="true"] { display: block; }

  .primary-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }
  .primary-nav__link {
    padding: 13px 16px;
    border-radius: 10px;
    font-size: 1rem;
  }
  .primary-nav__link::after { display: none; }
  .primary-nav__link:hover { transform: none; }

  .deck-brand__tagline { display: none; }
}

@media (max-width: 900px) {
  .deck-bar__inner { justify-content: flex-start; }
  .deck-stage { width: 100%; }
}

@media (max-width: 640px) {
  body { font-size: 15.5px; }

  .footer-grid { grid-template-columns: 1fr; }
  .footer-contact { grid-column: auto; }
  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .deck-stage__item { font-size: .7rem; padding: 4px 10px; }
  .wordmark__sub { display: none; }
  .btn { padding: 11px 18px; font-size: .86rem; }
  .to-top { width: 44px; height: 44px; }
}

/* ---------- 19. 减少动态效果 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

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

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

  .deck-stage__dot { animation: none !important; }
  .to-top { transform: none; }
  .site-header[data-condensed="true"] .deck-bar { max-height: 160px; opacity: 1; }
}