/* ============================================================
   博澳赛事 · 共享外壳样式 /assets/site.css
   夜场战术板：墨蓝画布 + 切角叠板 + 竞场绿 / 高亮橙红
   ============================================================ */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 96px; }
body, h1, h2, h3, h4, p, ul, ol, figure, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }
:focus-visible { outline: 2px solid #FFB020; outline-offset: 3px; border-radius: 2px; }
::selection { background: #16A46A; color: #04121F; }

/* ---------- 2. 变量 ---------- */
:root {
  --navy: #08182B;
  --navy-deep: #050E19;
  --board: #0F2A44;
  --pitch: #16A46A;
  --pitch-deep: #0C6B45;
  --flare: #FF5A2C;
  --amber: #FFB020;
  --cool: #E9EFF5;
  --mist: #F5F8FB;
  --steel: #8C9BAA;
  --ink: #0B1A2B;

  --line: rgba(140, 155, 170, .24);
  --line-soft: rgba(140, 155, 170, .13);
  --grid-line: rgba(140, 155, 170, .045);

  --font-head: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", Georgia, serif;
  --font-mono: ui-monospace, SFMono-Regular, "JetBrains Mono", "Roboto Mono", Menlo, Consolas, monospace;

  --shell: 1280px;
  --gutter: clamp(16px, 4.2vw, 40px);
  --cut: 16px;
  --ease: cubic-bezier(.2, .7, .2, 1);
}

/* ---------- 3. 基础画布与中文排版 ---------- */
body {
  min-height: 100vh;
  color: var(--cool);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  background-color: var(--navy);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px),
    radial-gradient(120% 80% at 88% -12%, rgba(22, 164, 106, .16), transparent 62%),
    radial-gradient(90% 70% at -6% 102%, rgba(255, 90, 44, .09), transparent 60%);
  background-size: 72px 72px, 72px 72px, 100% 100%, 100% 100%;
  background-attachment: fixed;
}
h1, h2, h3, h4 { font-family: var(--font-head); font-weight: 700; line-height: 1.16; }
p { line-height: 1.75; }
.site-main { display: block; }
#main-content { scroll-margin-top: 96px; }

/* ---------- 4. 容器与布局 ---------- */
.shell { width: min(var(--shell), 100% - var(--gutter) * 2); margin-inline: auto; }
.section { position: relative; padding-block: clamp(48px, 7vw, 96px); }
.grid { display: grid; gap: clamp(16px, 2vw, 28px); }
.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)); }
.split { display: grid; grid-template-columns: 7fr 5fr; gap: clamp(20px, 3vw, 48px); align-items: start; }
.split--reverse { grid-template-columns: 5fr 7fr; }
.divider { height: 1px; border: 0; margin: 0; background: var(--line-soft); }
.section-head { display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: 16px; margin-bottom: clamp(20px, 3vw, 36px); }

/* ---------- 5. 文字层级 ---------- */
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 12px; font-weight: 500;
  letter-spacing: .2em; text-transform: uppercase; color: var(--pitch);
}
.eyebrow::before { content: ""; width: 18px; height: 2px; background: var(--pitch); transform: skewX(-24deg); }
.section-title { font-size: clamp(26px, 3.2vw, 44px); font-weight: 700; letter-spacing: -.012em; }
.lede { font-family: var(--font-serif); font-weight: 500; font-size: clamp(18px, 1.7vw, 24px); line-height: 1.6; color: rgba(233, 239, 245, .88); }
.data-num { font-family: var(--font-mono); font-size: 15px; letter-spacing: .04em; color: var(--amber); text-transform: uppercase; }
.stamp { display: inline-flex; align-items: center; gap: 7px; font-family: var(--font-mono); font-size: 12px; letter-spacing: .06em; color: var(--steel); }
.stamp::before { content: ""; width: 7px; height: 7px; background: var(--flare); }

/* ---------- 6. 画板 ---------- */
.panel {
  position: relative;
  padding: clamp(20px, 3vw, 40px);
  background: var(--board);
  clip-path: polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));
}
.panel--deep { background: var(--navy-deep); }
.panel--pitch { background: linear-gradient(150deg, var(--pitch-deep), var(--board) 72%); }
.panel--mist { background: var(--mist); color: var(--ink); }
.panel--mist .section-title, .panel--mist .lede { color: var(--ink); }
.panel--bar { padding-left: calc(clamp(20px, 3vw, 40px) + 12px); }
.panel--bar::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px; background: var(--pitch); }

/* ---------- 7. 按钮与标签 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 20px; font-size: 15px; font-weight: 700; letter-spacing: .04em;
  text-decoration: none; border: 1px solid transparent;
  clip-path: polygon(12px 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%, 0 12px);
  transition: background-color .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease), transform .2s var(--ease);
}
.btn:hover { transform: translateY(-2px); }
.btn--primary { background: var(--flare); color: var(--navy-deep); }
.btn--primary:hover { background: var(--amber); }
.btn--ghost { background: transparent; border-color: var(--line); color: var(--cool); }
.btn--ghost:hover { border-color: var(--pitch); background: rgba(22, 164, 106, .14); }
.btn--quiet { background: rgba(22, 164, 106, .16); border-color: rgba(22, 164, 106, .42); color: var(--cool); }
.btn--quiet:hover { background: rgba(22, 164, 106, .28); }

.chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px; font-family: var(--font-mono); font-size: 12px; letter-spacing: .06em;
  color: var(--cool); background: rgba(15, 42, 68, .82); border: 1px solid var(--line-soft);
}
.chip--amber { color: var(--amber); background: rgba(255, 176, 32, .1); border-color: rgba(255, 176, 32, .38); }
.chip--pitch { color: #93ECC7; background: rgba(22, 164, 106, .16); border-color: rgba(22, 164, 106, .44); }

/* ---------- 8. 面包屑 / 正文 ---------- */
.breadcrumbs { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; padding: 14px 0; font-family: var(--font-mono); font-size: 12px; letter-spacing: .06em; color: var(--steel); }
.breadcrumbs li { display: flex; align-items: center; gap: 8px; }
.breadcrumbs li + li::before { content: "/"; color: rgba(140, 155, 170, .5); }
.breadcrumbs a { color: var(--steel); text-decoration: none; transition: color .2s var(--ease); }
.breadcrumbs a:hover { color: var(--pitch); }
.breadcrumbs [aria-current="page"] { color: var(--cool); }

.prose { max-width: 72ch; font-size: 17px; line-height: 1.8; }
.prose > * + * { margin-top: 18px; }
.prose h2 { margin-top: 44px; font-size: clamp(22px, 2.2vw, 30px); letter-spacing: -.01em; }
.prose h3 { margin-top: 32px; font-size: 19px; }
.prose a { color: var(--pitch); text-underline-offset: 4px; }
.prose strong { color: #fff; }
.prose ul, .prose ol { padding-left: 1.15em; list-style: disc; }
.prose li + li { margin-top: 8px; }
.prose blockquote { padding-left: 18px; border-left: 3px solid var(--pitch); color: rgba(233, 239, 245, .82); font-family: var(--font-serif); }

/* ---------- 9. 图片容器（页面阶段放图） ---------- */
.media {
  position: relative; overflow: hidden;
  background: linear-gradient(135deg, var(--board), var(--navy-deep));
  clip-path: polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));
}
.media img { width: 100%; height: 100%; object-fit: cover; }
.media::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(158deg, rgba(5, 14, 25, 0) 38%, rgba(5, 14, 25, .74) 100%);
}
.media--wide { aspect-ratio: 16 / 9; }
.media--portrait { aspect-ratio: 9 / 16; }
.media--square { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 3 / 4; }
.media__badge { position: absolute; left: 14px; top: 14px; z-index: 2; }
.media__caption {
  position: absolute; left: 0; right: 0; bottom: 0; z-index: 2;
  padding: 16px; font-size: 14px; line-height: 1.6; color: var(--cool);
}

/* ---------- 10. 横向轨道 / 筛选 / 索引 / 目录 / 数据条 ---------- */
.rail {
  display: flex; gap: 18px; padding: 4px 0 18px;
  overflow-x: auto; scroll-snap-type: x proximity; -webkit-overflow-scrolling: touch;
  -webkit-mask-image: linear-gradient(90deg, transparent 0, #000 40px, #000 calc(100% - 40px), transparent 100%);
  mask-image: linear-gradient(90deg, transparent 0, #000 40px, #000 calc(100% - 40px), transparent 100%);
}
.rail > * { flex: 0 0 clamp(230px, 30vw, 340px); scroll-snap-align: start; }
.rail::-webkit-scrollbar { height: 6px; }
.rail::-webkit-scrollbar-thumb { background: rgba(140, 155, 170, .35); }

.filter-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; padding: 14px 0; border-bottom: 1px solid var(--line-soft); }
.filter-btn {
  padding: 8px 14px; font-size: 14px; font-weight: 600; letter-spacing: .02em;
  color: rgba(233, 239, 245, .74); background: rgba(15, 42, 68, .62); border: 1px solid var(--line-soft);
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
  transition: background-color .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}
.filter-btn:hover { color: #fff; border-color: rgba(22, 164, 106, .6); }
.filter-btn[aria-pressed="true"] { background: var(--pitch); border-color: var(--pitch); color: #04141F; }
.filter-count { margin-left: auto; font-family: var(--font-mono); font-size: 12px; letter-spacing: .06em; color: var(--steel); }
.filter-empty {
  display: none; margin-top: 20px; padding: 22px 24px;
  border: 1px dashed var(--line); color: var(--steel);
  font-family: var(--font-mono); font-size: 13px; letter-spacing: .04em;
}
.filter-empty[data-visible] { display: block; }
[data-filter-item][hidden] { display: none; }

.index-list { border-top: 1px solid var(--line-soft); }
.index-list__row {
  display: grid; grid-template-columns: minmax(76px, 108px) 1fr minmax(120px, 180px);
  gap: 16px; align-items: baseline; padding: 18px 0;
  border-bottom: 1px solid var(--line-soft); text-decoration: none;
  transition: background-color .2s var(--ease), padding-left .2s var(--ease);
}
.index-list__row:hover { background: rgba(22, 164, 106, .08); padding-left: 10px; }
.index-list__tag { font-family: var(--font-mono); font-size: 12px; letter-spacing: .08em; color: var(--pitch); }
.index-list__title { font-size: 17px; font-weight: 600; color: var(--cool); }
.index-list__meta { font-family: var(--font-mono); font-size: 12px; letter-spacing: .04em; color: var(--steel); text-align: right; }

.toc { position: sticky; top: 104px; font-size: 14px; }
.toc__title { font-family: var(--font-mono); font-size: 12px; letter-spacing: .18em; color: var(--pitch); margin-bottom: 10px; }
.toc a { display: block; padding: 8px 0 8px 14px; border-left: 2px solid var(--line-soft); color: var(--steel); text-decoration: none; transition: color .2s var(--ease), border-color .2s var(--ease); }
.toc a:hover { color: var(--cool); }
.toc a[aria-current="true"] { color: var(--cool); border-left-color: var(--pitch); }

.data-bar { position: relative; height: 8px; overflow: hidden; background: rgba(140, 155, 170, .16); }
.data-bar__fill { display: block; height: 100%; width: 100%; transform-origin: 0 50%; background: linear-gradient(90deg, var(--pitch), var(--amber)); }

/* ---------- 11. 动效协议 ---------- */
[data-reveal] { opacity: 1; }
.will-reveal { opacity: 0; transform: translate3d(24px, 24px, 0); }
.will-reveal.is-visible {
  opacity: 1; transform: none;
  transition: opacity .32s var(--ease), transform .32s var(--ease);
}

/* ---------- 12. 页头 ---------- */
.skip-link {
  position: fixed; top: 8px; left: 8px; z-index: 200;
  padding: 10px 16px; font-weight: 700; text-decoration: none;
  background: var(--amber); color: #1A0D00;
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
  transform: translateY(-180%);
  transition: transform .2s var(--ease);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky; top: 0; z-index: 60;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(100deg, rgba(5, 14, 25, .98) 0%, rgba(8, 24, 43, .97) 46%, rgba(15, 42, 68, .95) 100%);
  box-shadow: 0 20px 44px -30px rgba(0, 0, 0, .95);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}
.header-bar {
  position: relative;
  display: flex; align-items: center; justify-content: space-between;
  gap: 20px; min-height: 70px; padding-block: 10px;
}
.brand-block { display: flex; align-items: center; gap: 14px; min-width: 0; }
.brand { position: relative; display: flex; align-items: center; gap: 10px; padding-left: 13px; text-decoration: none; color: var(--cool); }
.brand::before { content: ""; position: absolute; left: 0; top: 2px; bottom: 2px; width: 3px; background: var(--pitch); transform: skewY(-12deg); }
.brand__mark {
  width: 26px; height: 26px; flex: 0 0 auto;
  background: linear-gradient(140deg, var(--pitch), var(--pitch-deep));
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
  box-shadow: inset 0 0 0 3px rgba(5, 14, 25, .55);
}
.brand__name { display: block; font-family: var(--font-head); font-size: 21px; font-weight: 800; letter-spacing: .02em; line-height: 1.05; }
.brand__sub { display: block; margin-top: 3px; font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .22em; color: var(--steel); }

.status-chip {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 5px 10px; font-family: var(--font-mono); font-size: 11px; letter-spacing: .12em;
  color: var(--amber); background: rgba(255, 176, 32, .08); border: 1px solid rgba(255, 176, 32, .34);
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
  white-space: nowrap;
}
.status-chip__dot { width: 6px; height: 6px; border-radius: 50%; background: var(--amber); animation: statusPulse 2.4s var(--ease) infinite; }
@keyframes statusPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(255, 176, 32, .55); opacity: 1; }
  50% { box-shadow: 0 0 0 6px rgba(255, 176, 32, 0); opacity: .55; }
}

.nav-toggle {
  display: none; align-items: center; gap: 9px;
  padding: 9px 13px; font-size: 14px; font-weight: 600;
  color: var(--cool); background: rgba(15, 42, 68, .7); border: 1px solid var(--line);
  clip-path: polygon(9px 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%, 0 9px);
}
.nav-toggle__bars { position: relative; display: block; width: 16px; height: 10px; }
.nav-toggle__bars::before, .nav-toggle__bars::after {
  content: ""; position: absolute; left: 0; right: 0; height: 2px; background: var(--pitch);
  transition: transform .24s var(--ease), top .24s var(--ease);
}
.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars::after { top: 8px; }
.site-header[data-open] .nav-toggle__bars::before { top: 4px; transform: rotate(45deg); }
.site-header[data-open] .nav-toggle__bars::after { top: 4px; transform: rotate(-45deg); }
.nav-toggle__label { font-family: var(--font-mono); font-size: 12px; letter-spacing: .16em; }

.primary-nav { display: flex; align-items: center; gap: 16px; }
.primary-nav__list { display: flex; align-items: center; gap: 2px; }
.primary-nav__link {
  position: relative; display: block; padding: 9px 12px;
  font-size: 14.5px; font-weight: 600; letter-spacing: .02em;
  color: rgba(233, 239, 245, .76); text-decoration: none;
  transition: color .2s var(--ease); white-space: nowrap;
}
.primary-nav__link::after {
  content: ""; position: absolute; left: 12px; right: 12px; bottom: 4px; height: 2px;
  background: var(--pitch); transform: scaleX(0); transform-origin: left;
  transition: transform .24s var(--ease), background-color .2s var(--ease);
}
.primary-nav__link:hover { color: #fff; }
.primary-nav__link:hover::after { transform: scaleX(1); }
.primary-nav__link[aria-current="page"] { color: #fff; }
.primary-nav__link[aria-current="page"]::after { transform: scaleX(1); background: var(--amber); }

.nav-cta {
  display: inline-flex; align-items: center; white-space: nowrap;
  padding: 10px 16px; font-size: 14px; font-weight: 700; letter-spacing: .04em; text-decoration: none;
  color: var(--navy); background: var(--pitch);
  clip-path: polygon(11px 0, 100% 0, 100% calc(100% - 11px), calc(100% - 11px) 100%, 0 100%, 0 11px);
  transition: background-color .2s var(--ease), color .2s var(--ease);
}
.nav-cta:hover { background: var(--amber); color: #1A0D00; }

.scroll-progress { position: absolute; left: 0; right: 0; bottom: 0; height: 2px; overflow: hidden; background: rgba(140, 155, 170, .12); }
.scroll-progress__fill {
  display: block; height: 100%; width: 100%;
  transform: scaleX(0); transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--pitch), var(--amber) 62%, var(--flare));
}

/* ---------- 13. 页脚 ---------- */
.site-footer {
  position: relative; margin-top: clamp(48px, 8vw, 110px);
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, var(--navy-deep) 0%, #03090F 100%);
  color: var(--cool);
}
.site-footer::before {
  content: ""; position: absolute; top: -1px; left: 0;
  width: min(360px, 62%); height: 3px;
  background: linear-gradient(90deg, var(--pitch), var(--amber) 70%, transparent);
}
.footer-top {
  display: grid; grid-template-columns: 1.5fr repeat(4, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 36px);
  padding-block: clamp(36px, 5vw, 64px) clamp(26px, 4vw, 44px);
}
.footer-brand__name { font-family: var(--font-head); font-size: 20px; font-weight: 800; letter-spacing: .02em; }
.footer-brand__tag { margin-top: 8px; font-family: var(--font-mono); font-size: 11.5px; letter-spacing: .16em; color: var(--pitch); }
.footer-brand__meta { margin-top: 12px; font-size: 14px; line-height: 1.7; color: var(--steel); max-width: 34ch; }
.footer-brand__cta { margin-top: 18px; }
.footer-col__title { display: flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 700; letter-spacing: .08em; color: var(--cool); }
.footer-col__title::before { content: ""; width: 8px; height: 8px; background: var(--pitch); transform: skewX(-18deg); }
.footer-col__list { display: grid; gap: 10px; margin-top: 14px; }
.footer-col__list a {
  display: inline-block; font-size: 15px; color: rgba(233, 239, 245, .7); text-decoration: none;
  transition: color .2s var(--ease), transform .2s var(--ease);
}
.footer-col__list a:hover { color: var(--amber); transform: translateX(4px); }

.footer-contact {
  display: grid; gap: 14px;
  padding: clamp(18px, 2.5vw, 26px);
  background: rgba(15, 42, 68, .55); border-left: 3px solid var(--pitch);
  clip-path: polygon(14px 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%, 0 14px);
}
.footer-contact__label { font-family: var(--font-mono); font-size: 12px; letter-spacing: .18em; color: var(--pitch); }
.footer-contact__list { display: grid; gap: 10px; }
.footer-contact__item { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; font-size: 15px; }
.footer-contact__key { min-width: 64px; font-family: var(--font-mono); font-size: 12px; letter-spacing: .06em; color: var(--steel); }
.footer-contact__val { color: var(--cool); word-break: break-all; }
.footer-contact__note { font-size: 13.5px; line-height: 1.7; color: var(--steel); }

.copy-btn {
  padding: 6px 10px; font-family: var(--font-mono); font-size: 12px; letter-spacing: .06em;
  color: var(--cool); background: rgba(22, 164, 106, .12); border: 1px solid rgba(22, 164, 106, .42);
  clip-path: polygon(7px 0, 100% 0, 100% calc(100% - 7px), calc(100% - 7px) 100%, 0 100%, 0 7px);
  transition: background-color .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}
.copy-btn:hover { border-color: var(--pitch); background: rgba(22, 164, 106, .26); }
.copy-btn[data-copied] { background: var(--pitch); border-color: var(--pitch); color: #04141F; }
.copy-btn--mini { padding: 3px 8px; font-size: 11px; }

.footer-legal {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px 28px;
  margin-top: clamp(26px, 4vw, 44px); padding: 18px 0 30px;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono); font-size: 12px; letter-spacing: .04em; color: var(--steel);
}
.footer-legal__item { display: inline-flex; align-items: center; gap: 10px; }

.to-top {
  position: fixed; right: clamp(14px, 3vw, 28px); bottom: clamp(14px, 3vw, 28px); z-index: 70;
  padding: 10px 14px; font-family: var(--font-mono); font-size: 12px; letter-spacing: .08em;
  color: var(--cool); background: rgba(5, 14, 25, .92); border: 1px solid var(--line);
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
  opacity: 0; visibility: hidden; transform: translateY(10px);
  transition: opacity .24s var(--ease), transform .24s var(--ease), visibility .24s var(--ease), border-color .2s var(--ease);
}
.to-top[data-visible] { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { border-color: var(--pitch); color: #fff; }

/* ---------- 14. 响应式 ---------- */
@media (max-width: 1180px) {
  .status-chip { display: none; }
}
@media (max-width: 1100px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-top { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 980px) {
  .nav-toggle { display: inline-flex; }
  .primary-nav {
    position: absolute; left: 0; right: 0; top: 100%;
    flex-direction: column; align-items: stretch; gap: 12px;
    padding: 14px var(--gutter) 20px;
    background: linear-gradient(180deg, rgba(8, 24, 43, .99), rgba(5, 14, 25, .99));
    border-bottom: 1px solid var(--line);
    max-height: 0; overflow: hidden; opacity: 0; visibility: hidden;
    transition: max-height .3s var(--ease), opacity .22s var(--ease), visibility .22s var(--ease);
  }
  .site-header[data-open] .primary-nav { max-height: 72vh; overflow-y: auto; opacity: 1; visibility: visible; }
  .primary-nav__list {
    flex-wrap: nowrap; gap: 8px; overflow-x: auto; padding-bottom: 6px;
    scroll-snap-type: x proximity; -webkit-overflow-scrolling: touch;
  }
  .primary-nav__link {
    padding: 10px 14px; background: rgba(15, 42, 68, .72);
    border-left: 2px solid transparent; scroll-snap-align: start;
    clip-path: polygon(9px 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%, 0 9px);
  }
  .primary-nav__link::after { display: none; }
  .primary-nav__link[aria-current="page"] { background: rgba(22, 164, 106, .18); border-left-color: var(--pitch); }
  .nav-cta { justify-content: center; padding: 12px 16px; }
  .toc { position: static; }
}
@media (max-width: 860px) {
  .split, .split--reverse { grid-template-columns: 1fr; }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 720px) {
  body { background-attachment: scroll; }
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; }
  .footer-legal { justify-content: flex-start; }
  .index-list__row { grid-template-columns: 1fr; gap: 6px; }
  .index-list__meta { text-align: left; }
  .lede { font-size: 18px; }
}

/* ---------- 15. 无障碍动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .will-reveal { opacity: 1; transform: none; }
  .btn:hover, .footer-col__list a:hover, .index-list__row:hover { transform: none; }
  .scroll-progress__fill { transition: none; }
}