/* ==========================================================================
   8868体育官方版 · 共享样式 /assets/site.css
   设计基因：堆叠面板 · 斜向切割 · 玻璃层与实色层并置 · 高原双色节奏
   ========================================================================== */

/* ---------- 01. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-offset) + 24px);
}

body, h1, h2, h3, h4, h5, h6, p, ul, ol, li, figure, blockquote, dl, dd, fieldset {
  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, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }
:focus-visible { outline: 2px solid var(--c-gold); outline-offset: 3px; }

/* ---------- 02. Tokens ---------- */
:root {
  --c-red: #B01F24;
  --c-red-deep: #7A1216;
  --c-gold: #E8A33A;
  --c-gold-soft: #F7DCA8;
  --c-navy: #0D1B33;
  --c-navy-mid: #1B2E4E;
  --c-blue: #2F6FB5;
  --c-teal: #17958F;
  --c-snow: #FAF8F4;
  --c-rock: #6E6A63;
  --c-char: #16181D;

  --bg-page: #FAF8F4;
  --bg-solid: #FFFFFF;
  --bg-deep: var(--c-navy);
  --bg-deep-2: var(--c-navy-mid);
  --text: var(--c-char);
  --text-muted: var(--c-rock);
  --text-on-deep: #FAF8F4;
  --line: rgba(22, 24, 29, .14);
  --line-strong: rgba(22, 24, 29, .3);
  --glass: rgba(13, 27, 51, .58);
  --glass-line: rgba(232, 163, 58, .34);
  --on-deep-soft: rgba(250, 248, 244, .78);
  --on-deep-line: rgba(250, 248, 244, .16);

  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, "IBM Plex Mono", SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  --wrap: 1240px;
  --header-offset: 72px;
  --sp-1: 8px;
  --sp-2: 16px;
  --sp-3: 24px;
  --sp-4: 32px;
  --sp-5: 48px;
  --sp-6: 72px;
  --sp-7: 104px;
  --ease: cubic-bezier(.22, .61, .36, 1);
  --slant-rise: 44px;
}

[data-theme="night"] {
  --bg-page: #0A1425;
  --bg-solid: #152741;
  --text: #F2EFE8;
  --text-muted: #9FB0C6;
  --line: rgba(250, 248, 244, .18);
  --line-strong: rgba(250, 248, 244, .34);
}

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

/* ---------- 03. Base ---------- */
body {
  background: var(--bg-page);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  letter-spacing: .01em;
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color .3s var(--ease), color .3s var(--ease);
}

h1, h2, h3, h4 {
  font-weight: 900;
  line-height: 1.28;
  letter-spacing: -.02em;
  text-wrap: balance;
}

p { max-width: 40em; }

/* ---------- 04. 布局骨架 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: 24px;
}

.wrap--wide { max-width: 1440px; }

.site-main { padding-top: var(--header-offset); }
.bleed-top { margin-top: calc(var(--header-offset) * -1); }

.section { padding: var(--sp-6) 0; }
.section--tight { padding: var(--sp-5) 0; }
.section--deep {
  background: var(--c-navy);
  color: var(--c-snow);
  border-block: 1px solid rgba(232, 163, 58, .22);
}

.stack { display: flex; flex-direction: column; gap: var(--sp-3); }
.stack--tight { display: flex; flex-direction: column; gap: var(--sp-2); }

.grid { display: grid; gap: var(--sp-3); }
.grid--7-5 { grid-template-columns: 7fr 5fr; }
.grid--5-7 { grid-template-columns: 5fr 7fr; }
.grid--8-4 { grid-template-columns: 8fr 4fr; }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.hairline { height: 1px; border: 0; background: var(--line); }

.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;
}

.skip-link {
  position: fixed;
  top: 8px; left: 8px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--c-gold);
  color: var(--c-navy);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .06em;
  transform: translateY(-160%);
  transition: transform .2s var(--ease);
}
.skip-link:focus { transform: translateY(0); }

/* ---------- 05. Header ---------- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 90;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color .28s var(--ease), border-color .28s var(--ease);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 132px;
  background: linear-gradient(180deg, rgba(13, 27, 51, .88) 0%, rgba(13, 27, 51, .55) 55%, rgba(13, 27, 51, 0) 100%);
  pointer-events: none;
  transition: opacity .28s var(--ease);
}

.site-header.is-scrolled,
.site-header[data-open="true"] {
  background: var(--c-navy);
  border-bottom: 1px solid var(--c-gold);
}

.site-header.is-scrolled::before,
.site-header[data-open="true"]::before { opacity: 0; }

.site-header__inner {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  min-height: var(--header-offset);
  padding-block: 8px;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.site-brand__mark {
  width: 15px;
  height: 15px;
  background: var(--c-gold);
  clip-path: polygon(50% 0, 100% 100%, 0 100%);
}

.site-brand__name {
  font-size: 19px;
  font-weight: 900;
  letter-spacing: -.01em;
  color: var(--c-snow);
}

.site-brand__chip {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  padding: 3px 7px;
  color: var(--c-gold);
  border: 1px solid rgba(232, 163, 58, .45);
  background: rgba(232, 163, 58, .1);
}

.primary-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

.primary-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.primary-nav__link {
  position: relative;
  display: inline-block;
  padding: 10px 12px;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--on-deep-soft);
  transition: color .2s var(--ease), background-color .2s var(--ease);
}

.primary-nav__link:hover {
  color: var(--c-snow);
  background: rgba(250, 248, 244, .08);
}

.primary-nav__link[aria-current="page"] { color: var(--c-snow); font-weight: 700; }

.primary-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 12px; right: 12px; bottom: 3px;
  height: 2px;
  background: var(--c-red);
}

.primary-nav__utility {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-left: var(--sp-2);
  border-left: 1px solid var(--on-deep-line);
}

.utility-link {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-gold);
  padding: 8px 10px;
  border: 1px solid rgba(232, 163, 58, .42);
  transition: background-color .2s var(--ease), color .2s var(--ease);
}

.utility-link:hover { background: rgba(232, 163, 58, .16); color: var(--c-gold-soft); }

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--on-deep-soft);
  border: 1px solid var(--on-deep-line);
  transition: background-color .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}

.theme-toggle:hover { border-color: var(--c-gold); color: var(--c-snow); }

.theme-toggle__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--c-teal);
  box-shadow: 0 0 0 3px rgba(23, 149, 143, .26);
}

.theme-toggle[aria-pressed="true"] {
  background: var(--c-gold);
  border-color: var(--c-gold);
  color: var(--c-navy);
}

.theme-toggle[aria-pressed="true"] .theme-toggle__dot {
  background: var(--c-navy);
  box-shadow: none;
}

.nav-toggle {
  display: none;
  margin-left: auto;
  align-items: center;
  gap: 9px;
  padding: 10px 12px;
  color: var(--c-snow);
  border: 1px solid var(--on-deep-line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
}

.nav-toggle__icon {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  width: 16px;
}

.nav-toggle__bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--c-gold);
}

.nav-toggle[aria-expanded="true"] { background: var(--c-red); border-color: var(--c-red); }

/* ---------- 06. Footer ---------- */
.site-footer {
  position: relative;
  margin-top: var(--sp-7);
  background: var(--c-navy);
  color: var(--on-deep-soft);
}

.site-footer::before {
  content: "";
  position: absolute;
  left: 0; right: 0;
  top: calc(var(--slant-rise) * -1);
  height: var(--slant-rise);
  background: var(--c-navy);
  clip-path: polygon(0 100%, 100% 0, 100% 100%, 0 100%);
}

.site-footer__inner { padding-block: var(--sp-6) var(--sp-5); }

.site-footer__top {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: var(--sp-5);
  padding-bottom: var(--sp-5);
}

.site-footer__brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--sp-2);
}

.site-brand--footer .site-brand__name { font-size: 22px; }

.site-footer__tagline {
  max-width: 30em;
  font-size: 14.5px;
  color: var(--on-deep-soft);
  border-left: 2px solid var(--c-red);
  padding-left: 14px;
}

.site-footer__cta { margin-top: 4px; }

.site-footer__columns {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--sp-4);
}

.footer-col__title {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--c-gold);
  margin-bottom: 14px;
}

.footer-col__list { display: flex; flex-direction: column; gap: 10px; }

.footer-link {
  font-size: 14.5px;
  color: var(--on-deep-soft);
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.footer-link:hover { color: var(--c-snow); border-bottom-color: var(--c-gold); }

.site-footer__contact {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--sp-3);
  padding-block: var(--sp-4);
  border-top: 1px solid var(--on-deep-line);
  border-bottom: 1px solid var(--on-deep-line);
}

.footer-contact__row { display: flex; flex-direction: column; gap: 6px; }

.footer-contact__key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--c-gold);
}

.footer-contact__value {
  font-size: 14.5px;
  color: var(--c-snow);
  word-break: break-word;
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px var(--sp-4);
  padding-top: var(--sp-3);
  font-size: 13px;
  color: rgba(250, 248, 244, .62);
}

.footer-legal {
  font-family: var(--font-mono);
  letter-spacing: .08em;
  color: var(--c-gold-soft);
}

.footer-update { max-width: 46ch; }
.footer-copy { font-family: var(--font-mono); letter-spacing: .06em; }

/* ---------- 07. 章节与画板 ---------- */
.section__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--sp-2) var(--sp-3);
  align-items: start;
  margin-bottom: var(--sp-4);
}

.section-num {
  font-family: var(--font-mono);
  font-size: clamp(40px, 6vw, 64px);
  font-weight: 700;
  line-height: .84;
  letter-spacing: -.04em;
  color: var(--c-gold);
}

.section-title { font-size: clamp(23px, 3vw, 34px); }

.section-note {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--text-muted);
}

.section--deep .section-note { color: var(--on-deep-soft); }

.panel {
  position: relative;
  background: var(--bg-solid);
  border: 1px solid var(--line);
  padding: var(--sp-4);
}

.panel--deep {
  background: var(--c-navy-mid);
  color: var(--c-snow);
  border-color: rgba(232, 163, 58, .26);
}

.panel--slant {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 28px), 0 100%);
  padding-bottom: calc(var(--sp-4) + 20px);
}

.glass {
  background: var(--glass);
  border: 1px solid var(--glass-line);
  color: var(--c-snow);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  transition: background-color .2s var(--ease);
}

.glass:hover { background: rgba(13, 27, 51, .76); }

/* ---------- 08. 卡片与标签 ---------- */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: var(--sp-3);
  background: var(--bg-solid);
  border: 1px solid var(--line);
  border-left: 4px solid var(--c-red);
  transition: transform .16s var(--ease), border-color .16s var(--ease);
}

.card:hover { transform: translateY(-2px); border-color: var(--c-gold); border-left-color: var(--c-gold); }

.card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--text-muted);
}

.card__title { font-size: 18px; font-weight: 800; line-height: 1.42; }
.card__text { font-size: 14.5px; color: var(--text-muted); }
.card__foot { margin-top: auto; padding-top: 6px; display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  border: 1px solid currentColor;
}

.chip--red { color: var(--c-red); background: rgba(176, 31, 36, .08); }
.chip--gold { color: #8A5A10; background: var(--c-gold-soft); border-color: var(--c-gold); }
.chip--teal { color: #0D5F5B; background: rgba(23, 149, 143, .12); border-color: var(--c-teal); }
.chip--on-deep { color: var(--c-gold); background: rgba(232, 163, 58, .14); border-color: rgba(232, 163, 58, .5); }

/* ---------- 09. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .02em;
  border: 1px solid transparent;
  transition: background-color .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease), transform .18s var(--ease);
}

.btn--primary { background: var(--c-red); color: #FFFFFF; }
.btn--primary:hover { background: var(--c-red-deep); transform: translateY(-1px); }

.btn--gold { background: var(--c-gold); color: var(--c-navy); }
.btn--gold:hover { background: var(--c-gold-soft); }

.btn--ghost { border-color: var(--c-gold); color: var(--c-gold); background: transparent; }
.btn--ghost:hover { background: rgba(232, 163, 58, .16); }

.btn--sm { padding: 8px 14px; font-size: 13px; }

/* ---------- 10. 面包屑与页头 ---------- */
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--text-muted);
}

.breadcrumb__list { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.breadcrumb__item { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumb__sep { color: var(--c-gold); }
.breadcrumb__link { border-bottom: 1px solid transparent; }
.breadcrumb__link:hover { color: var(--c-blue); border-bottom-color: currentColor; }

.page-head {
  position: relative;
  overflow: hidden;
  background: var(--c-navy);
  color: var(--c-snow);
  padding: var(--sp-6) 0 var(--sp-5);
}

.page-head::after {
  content: "";
  position: absolute;
  top: -34%;
  right: -12%;
  width: 54%;
  height: 190%;
  background: linear-gradient(120deg, rgba(176, 31, 36, .55), rgba(232, 163, 58, .1));
  transform: rotate(6deg);
  pointer-events: none;
}

.page-head__inner { position: relative; z-index: 2; display: grid; gap: 14px; }
.page-head__title { font-size: clamp(30px, 4.4vw, 52px); }
.page-head__lede { max-width: 42em; color: var(--on-deep-soft); }

/* ---------- 11. 正文 ---------- */
.prose { max-width: 42em; }
.prose p { margin-bottom: 1.1em; max-width: 36em; }
.prose h2 { font-size: 26px; margin: 1.8em 0 .6em; }
.prose h3 { font-size: 20px; margin: 1.5em 0 .5em; }
.prose ul, .prose ol { margin: 0 0 1.2em; padding-left: 0; display: flex; flex-direction: column; gap: 8px; }
.prose li { position: relative; padding-left: 20px; max-width: 36em; }
.prose li::before {
  content: "";
  position: absolute;
  left: 0; top: .72em;
  width: 9px; height: 9px;
  background: var(--c-gold);
}
.prose blockquote {
  border-left: 4px solid var(--c-red);
  padding: 12px 18px;
  background: rgba(232, 163, 58, .1);
  margin: 0 0 1.4em;
}
.prose a { color: var(--c-blue); border-bottom: 1px solid currentColor; }
.prose strong { font-weight: 700; }

/* ---------- 12. 索引栏与横向索引带 ---------- */
.index-rail {
  position: sticky;
  top: calc(var(--header-offset) + 24px);
  align-self: start;
}

.index-rail__title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--c-gold);
  margin-bottom: 12px;
}

.index-rail__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  border-left: 1px solid var(--line);
}

.index-rail__link {
  display: block;
  margin-left: -1px;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--text-muted);
  border-left: 2px solid transparent;
  transition: color .2s var(--ease), background-color .2s var(--ease), border-color .2s var(--ease);
}

.index-rail__link:hover { color: var(--text); background: rgba(232, 163, 58, .1); }

.index-rail__link.is-active {
  color: var(--text);
  font-weight: 700;
  border-left-color: var(--c-red);
  background: rgba(176, 31, 36, .06);
}

.rail-scroller {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding: 14px 0;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.rail-scroller__item {
  flex: 0 0 auto;
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  white-space: nowrap;
  border: 1px solid var(--line-strong);
  color: var(--text);
  transition: border-color .2s var(--ease), color .2s var(--ease);
}

.rail-scroller__item:hover { border-color: var(--c-gold); color: var(--c-red); }

/* ---------- 13. 筛选 ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 12px;
  background: var(--glass);
  border: 1px solid var(--glass-line);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}

.filter-btn {
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-snow);
  border: 1px solid var(--on-deep-line);
  transition: background-color .16s var(--ease), color .16s var(--ease), border-color .16s var(--ease);
}

.filter-btn:hover { border-color: var(--c-teal); }

.filter-btn[aria-pressed="true"] {
  background: var(--c-teal);
  border-color: var(--c-teal);
  color: #FFFFFF;
  font-weight: 700;
}

.is-filtered-out { display: none !important; }

.is-entering { animation: filterFadeIn .16s var(--ease) both; }

@keyframes filterFadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 14. 数据图形 ---------- */
.figure-num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--c-red);
}

.mono { font-family: var(--font-mono); letter-spacing: .08em; }

.score-bar {
  display: grid;
  grid-template-columns: minmax(58px, auto) minmax(0, 1fr) minmax(40px, auto);
  align-items: center;
  gap: 12px;
}

.score-bar__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--text-muted);
}

.score-bar__track { height: 8px; background: var(--line); overflow: hidden; }

.score-bar__fill {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--c-red), var(--c-gold));
  transition: width .6s var(--ease);
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--text-muted);
}

.legend__item { display: inline-flex; align-items: center; gap: 8px; }

.legend__mark { width: 12px; height: 12px; background: var(--c-gold); }
.legend__mark--triangle { clip-path: polygon(50% 0, 100% 100%, 0 100%); background: var(--c-red); }
.legend__mark--square { background: var(--c-gold); }
.legend__mark--circle { border-radius: 50%; background: var(--c-teal); }

/* ---------- 15. 图片容器 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, var(--c-navy) 0%, var(--c-navy-mid) 58%, var(--c-red-deep) 100%);
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame__fill {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(135deg, rgba(176, 31, 36, .55) 0%, rgba(13, 27, 51, 0) 55%),
    repeating-linear-gradient(115deg, rgba(250, 248, 244, .07) 0 2px, rgba(250, 248, 244, 0) 2px 14px);
}

.media-frame__img { width: 100%; height: 100%; object-fit: cover; }

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(13, 27, 51, 0) 42%, rgba(13, 27, 51, .78) 100%);
  pointer-events: none;
}

.media-frame__caption {
  position: absolute;
  left: 16px; right: 16px; bottom: 12px;
  z-index: 2;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--c-snow);
  max-width: none;
}

/* ---------- 16. 显现场景 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .32s var(--ease), transform .32s var(--ease);
}

.reveal.is-visible { opacity: 1; transform: none; }

/* ---------- 17. 响应式 ---------- */
@media (max-width: 1100px) {
  .grid--7-5, .grid--5-7, .grid--8-4 { grid-template-columns: minmax(0, 1fr); }
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 980px) {
  :root { --header-offset: 62px; }

  .site-header__inner { padding-block: 6px; }

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

  .primary-nav {
    position: fixed;
    inset: var(--header-offset) 0 0 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--sp-4) 24px var(--sp-6);
    background: var(--c-navy);
    border-top: 1px solid rgba(232, 163, 58, .35);
    overflow-y: auto;
    transform: translateY(-14px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: transform .3s var(--ease), opacity .3s var(--ease), visibility .3s var(--ease);
  }

  .site-header[data-open="true"] .primary-nav {
    transform: none;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .primary-nav__list { flex-direction: column; align-items: stretch; gap: 0; }

  .primary-nav__item + .primary-nav__item { border-top: 1px solid var(--on-deep-line); }

  .primary-nav__link { display: block; padding: 16px 4px; font-size: 17px; }

  .primary-nav__link[aria-current="page"]::after {
    left: 4px; right: auto; top: 16px; bottom: 16px;
    width: 3px; height: auto;
  }

  .primary-nav__utility {
    margin-top: var(--sp-4);
    padding: var(--sp-3) 0 0;
    border-left: 0;
    border-top: 1px solid var(--on-deep-line);
    flex-wrap: wrap;
  }

  .site-footer__top { grid-template-columns: minmax(0, 1fr); gap: var(--sp-4); }
  .site-footer__columns { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .site-footer__contact { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 760px) {
  .wrap { padding-inline: 16px; }
  .section { padding: var(--sp-5) 0; }
  .grid--3 { grid-template-columns: minmax(0, 1fr); }
  .panel, .panel--slant { padding: var(--sp-3); }
  .page-head { padding: var(--sp-5) 0 var(--sp-4); }
  .site-footer__columns { grid-template-columns: minmax(0, 1fr); }
  .site-footer__contact { grid-template-columns: minmax(0, 1fr); }
  .site-footer__bottom { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 560px) {
  .site-brand__chip { display: none; }
  .site-brand__name { font-size: 17px; }
  .grid--4 { grid-template-columns: minmax(0, 1fr); }
  .section__head { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 18. 无障碍与减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

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

  .reveal { opacity: 1; transform: none; }
}