/* ============================================================
   酷游赛场 · 共享样式 /assets/site.css
   底卷：高原晨雾灰 → 深湖蓝页脚；强调：青海湖蓝 / 经幡橙 / 青稞金
   ============================================================ */

:root {
  --mist: #E9EDF0;
  --chalk: #F7F8F9;
  --lake: #0D7C8F;
  --deep: #0B3C49;
  --indigo: #4B3F92;
  --orange: #E4712A;
  --gold: #C9A227;
  --trace: #B9CBD3;
  --rock: #5C6A72;
  --ink: #12262E;

  --font-display: "Songti SC", "STSong", "Source Han Serif SC", "Noto Serif SC", Georgia, "Times New Roman", serif;
  --font-body: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;

  --wrap: 1280px;
  --prose: 730px;
  --gutter: clamp(18px, 4vw, 64px);
  --radius-pill: 999px;
  --shadow-island: 0 12px 34px -22px rgba(11, 60, 73, .58), 0 2px 10px -6px rgba(11, 60, 73, .22);
  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--ink);
  background-color: var(--mist);
  background-image:
    radial-gradient(1200px 620px at 92% -10%, rgba(13, 124, 143, .10), transparent 62%),
    radial-gradient(820px 520px at -8% 38%, rgba(75, 63, 146, .07), transparent 60%);
  background-repeat: no-repeat;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--deep);
  line-height: 1.24;
  letter-spacing: .01em;
  margin: 0 0 .55em;
}

h1 { font-size: clamp(34px, 5.4vw, 68px); line-height: 1.1; }
h2 { font-size: clamp(25px, 3.2vw, 40px); }
h3 { font-size: clamp(20px, 2.2vw, 26px); }
h4 { font-size: 18px; font-family: var(--font-body); letter-spacing: .02em; }
h5 { font-size: 16px; font-family: var(--font-body); letter-spacing: .02em; }

p { margin: 0 0 1.15em; }
ul, ol { margin: 0 0 1.15em; padding-left: 1.25em; }
li { margin-bottom: .4em; }

a { color: var(--lake); text-decoration: none; }
a:hover { color: var(--deep); }

img, svg, video { max-width: 100%; display: block; }
img { height: auto; }

button, input, select, textarea { font: inherit; color: inherit; }
dl, dd, figure { margin: 0; }

:focus-visible {
  outline: 2px solid var(--lake);
  outline-offset: 3px;
  border-radius: 3px;
}

#main-content { scroll-margin-top: 130px; }

/* ---------- 容器与文本工具 ---------- */
.wrap {
  width: min(var(--wrap), 100% - (var(--gutter) * 2));
  margin-inline: auto;
}

.prose { max-width: var(--prose); }
.prose > :last-child { margin-bottom: 0; }
.prose p { margin: 0 0 1.25em; }

.lede {
  font-size: clamp(17px, 1.35vw, 20px);
  line-height: 1.78;
  color: #22404A;
  max-width: var(--prose);
}

.display {
  font-family: var(--font-display);
  font-size: clamp(42px, 7.4vw, 106px);
  line-height: 1.02;
  letter-spacing: -.005em;
  color: var(--deep);
  margin: 0;
}

.meta {
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--rock);
  font-variant-numeric: tabular-nums;
}

.num { font-variant-numeric: tabular-nums; letter-spacing: .02em; }

.tag {
  display: inline-block;
  padding: 4px 13px;
  border: 1px solid var(--trace);
  border-radius: var(--radius-pill);
  background: rgba(247, 248, 249, .72);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--rock);
  margin: 0 6px 6px 0;
}

.rule { height: 1px; background: var(--trace); border: 0; margin: 0; }

.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;
}

/* ---------- 页头：双浮岛 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  padding: 12px 0 0;
  background: linear-gradient(180deg, rgba(233, 237, 240, .97) 0%, rgba(233, 237, 240, .78) 58%, rgba(233, 237, 240, 0) 100%);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}

.header-rail {
  position: relative;
  width: min(var(--wrap), 100% - (var(--gutter) * 2));
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 14px;
}

.skip-link {
  position: absolute;
  left: var(--gutter);
  top: 10px;
  z-index: 90;
  transform: translateY(-180%);
  background: var(--deep);
  color: #FFFFFF;
  padding: 12px 22px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 600;
  transition: transform .22s var(--ease);
}
.skip-link:focus { transform: none; color: #FFFFFF; }

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 8px 20px 8px 12px;
  background: var(--chalk);
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-island);
  color: var(--deep);
  flex: 0 0 auto;
}
.brand:hover { color: var(--deep); }

.brand__mark {
  position: relative;
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  border-radius: 11px;
  background: linear-gradient(155deg, var(--lake), var(--deep) 78%);
  overflow: hidden;
}
.brand__mark::before {
  content: "";
  position: absolute;
  left: 6px; right: 6px; bottom: 10px;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), var(--orange));
  transform: rotate(-18deg);
}
.brand__mark::after {
  content: "";
  position: absolute;
  left: 8px; right: 10px; top: 12px;
  height: 1px;
  background: rgba(247, 248, 249, .6);
  transform: rotate(-18deg);
}

.brand__text { display: flex; flex-direction: column; line-height: 1.16; }
.brand__name {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--deep);
}
.brand__tagline {
  margin-top: 3px;
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--rock);
}

.nav-pill {
  background: rgba(247, 248, 249, .94);
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-island);
  transition: background .25s var(--ease), box-shadow .25s var(--ease);
  max-width: 100%;
}

.nav-pill__list {
  display: flex;
  align-items: center;
  gap: 2px;
  list-style: none;
  margin: 0;
  padding: 6px;
}

.nav-link {
  display: block;
  padding: 9px 16px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  letter-spacing: .02em;
  color: var(--deep);
  white-space: nowrap;
  transition: background .22s var(--ease), color .22s var(--ease);
}
.nav-link:hover { background: rgba(13, 124, 143, .12); color: var(--deep); }
.nav-link[aria-current="page"] { background: var(--deep); color: #FFFFFF; }
.nav-link[aria-current="page"]:hover { background: var(--deep); color: #FFFFFF; }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  background: var(--chalk);
  color: var(--deep);
  box-shadow: var(--shadow-island);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .06em;
  cursor: pointer;
  flex: 0 0 auto;
}
.nav-toggle__bars { display: inline-flex; flex-direction: column; gap: 4px; width: 16px; }
.nav-toggle__bars i {
  display: block;
  height: 2px;
  width: 16px;
  background: var(--lake);
  border-radius: 2px;
  transition: transform .25s var(--ease), width .25s var(--ease);
}
.nav-toggle__bars i:last-child { width: 10px; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:first-child { transform: translateY(3px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:last-child { transform: translateY(-3px) rotate(-45deg); width: 16px; }

.scroll-progress {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 3px;
  overflow: hidden;
  background: rgba(185, 203, 211, .35);
}
.scroll-progress span {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--lake), var(--indigo) 46%, var(--orange) 78%, var(--gold));
}

.site-header[data-scrolled] { padding-top: 8px; }
.site-header[data-scrolled] .header-rail { padding-bottom: 10px; }
.site-header[data-scrolled] .nav-pill { background: var(--chalk); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 28px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .03em;
  text-decoration: none;
  cursor: pointer;
  transition: transform .2s var(--ease), background .22s var(--ease), color .22s var(--ease), border-color .22s var(--ease);
}
.btn--primary { background: var(--deep); color: #FFFFFF; }
.btn--primary:hover { background: var(--lake); color: #FFFFFF; transform: translateY(-2px); }
.btn--ghost { background: transparent; color: var(--deep); border-color: var(--trace); }
.btn--ghost:hover { border-color: var(--lake); color: var(--lake); transform: translateY(-2px); }
.btn--quiet { background: var(--chalk); color: var(--deep); border-color: rgba(185, 203, 211, .6); }
.btn--quiet:hover { border-color: var(--lake); color: var(--lake); }

/* ---------- 面包屑 ---------- */
.breadcrumb { padding: 6px 0 0; }
.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 13px;
  letter-spacing: .03em;
  color: var(--rock);
}
.breadcrumb__item { margin: 0; display: inline-flex; align-items: center; }
.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--trace);
}
.breadcrumb__list a {
  color: var(--rock);
  border-bottom: 1px solid var(--trace);
  padding-bottom: 1px;
}
.breadcrumb__list a:hover { color: var(--lake); border-color: var(--lake); }

/* ---------- 章节骨架 ---------- */
.section {
  position: relative;
  padding: clamp(52px, 8vw, 116px) 0;
}
.section--tight { padding: clamp(34px, 5vw, 72px) 0; }

.section__head {
  display: flex;
  align-items: flex-start;
  gap: clamp(14px, 2.4vw, 34px);
  margin-bottom: clamp(22px, 3vw, 44px);
}
.section__num {
  flex: 0 0 auto;
  min-width: 3.4em;
  padding-top: .55em;
  border-top: 2px solid var(--gold);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--lake);
  font-variant-numeric: tabular-nums;
}
.section__title { margin: 0; font-size: clamp(26px, 3.3vw, 40px); }
.section__lede {
  margin: 12px 0 0;
  max-width: var(--prose);
  font-size: 16px;
  color: var(--rock);
}

.band {
  height: 8px;
  width: 100%;
  background: var(--trace);
  transform-origin: left center;
}
.band--spectrum {
  background: linear-gradient(90deg, var(--lake), var(--indigo) 34%, var(--orange) 68%, var(--gold));
}
.band--hair { height: 1px; }

/* ---------- 网格 ---------- */
.grid { display: grid; gap: clamp(20px, 2.6vw, 34px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--sidebar { grid-template-columns: minmax(0, 1fr) minmax(220px, 300px); align-items: start; }
.grid--sidebar-left { grid-template-columns: minmax(200px, 260px) minmax(0, 1fr); align-items: start; }

/* ---------- 面板 ---------- */
.panel {
  position: relative;
  background: var(--chalk);
  padding: clamp(22px, 3vw, 38px);
  box-shadow: inset 0 0 0 1px rgba(185, 203, 211, .75);
}
.panel--notch {
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 0 100%);
  box-shadow: none;
  border-top: 1px solid var(--trace);
  border-left: 1px solid var(--trace);
  border-right: 1px solid var(--trace);
  border-bottom: 1px solid var(--trace);
}
.panel--accent {
  background: var(--deep);
  color: #DCE7EB;
  box-shadow: none;
}
.panel--accent h2, .panel--accent h3 { color: #F3F7F9; }
.panel--accent a { color: #F0C9AE; }
.panel--accent a:hover { color: #FFFFFF; }
.panel__label {
  display: block;
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--lake);
  margin-bottom: 10px;
}
.panel--accent .panel__label { color: var(--gold); }

/* ---------- 数据卡片 ---------- */
.data-card {
  background: var(--chalk);
  padding: clamp(20px, 2.4vw, 30px);
  border-top: 3px solid var(--gold);
}
.data-card__value {
  font-family: var(--font-display);
  font-size: clamp(32px, 3.8vw, 50px);
  line-height: 1;
  color: var(--deep);
  font-variant-numeric: tabular-nums;
}
.data-card__label {
  margin-top: 12px;
  font-size: 13.5px;
  letter-spacing: .04em;
  color: var(--rock);
}
.data-card__rule {
  width: 46px;
  height: 3px;
  margin-top: 14px;
  background: var(--gold);
}

/* ---------- 旁注 ---------- */
.aside-note {
  border-left: 2px solid var(--indigo);
  padding: 2px 0 2px 18px;
  font-size: 14px;
  line-height: 1.78;
  color: var(--rock);
}
.aside-note__label {
  display: block;
  margin-bottom: 8px;
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--indigo);
}
.aside-note p:last-child { margin-bottom: 0; }

/* ---------- 图片容器 ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: linear-gradient(150deg, var(--chalk) 0%, var(--mist) 55%, #D8E1E7 100%);
  color: var(--rock);
}
.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(112deg, rgba(13, 124, 143, .16) 0 1px, transparent 1px 44px);
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(120% 92% at 10% 112%, rgba(11, 60, 73, .22), transparent 62%);
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame__slot {
  position: absolute;
  inset: auto 0 0 0;
  z-index: 2;
  padding: 16px 20px;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--rock);
}
.media-frame__caption {
  position: absolute;
  left: 0; bottom: 0;
  z-index: 3;
  max-width: 100%;
  padding: 9px 18px;
  background: rgba(11, 60, 73, .88);
  color: #EAF1F4;
  font-size: 13px;
  letter-spacing: .03em;
}

/* ---------- 折叠问答 ---------- */
.accordion { border-top: 1px solid var(--trace); }
.accordion__item { border-bottom: 1px solid var(--trace); }
.accordion__summary {
  position: relative;
  display: block;
  padding: 20px 46px 20px 0;
  cursor: pointer;
  list-style: none;
  font-size: 17px;
  font-weight: 600;
  color: var(--deep);
}
.accordion__summary::-webkit-details-marker { display: none; }
.accordion__summary::after {
  content: "";
  position: absolute;
  right: 10px;
  top: 50%;
  width: 11px;
  height: 11px;
  margin-top: -7px;
  border-right: 2px solid var(--lake);
  border-bottom: 2px solid var(--lake);
  transform: rotate(45deg);
  transition: transform .25s var(--ease), margin-top .25s var(--ease);
}
.accordion__item[open] .accordion__summary::after {
  transform: rotate(-135deg);
  margin-top: -2px;
}
.accordion__body {
  padding: 0 0 24px;
  max-width: var(--prose);
  font-size: 16px;
  color: #24404A;
}
.accordion__body > :last-child { margin-bottom: 0; }

/* ---------- 主题筛选 ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  width: fit-content;
  max-width: 100%;
  padding: 7px;
  border: 1px solid var(--trace);
  border-radius: var(--radius-pill);
  background: rgba(247, 248, 249, .88);
}
.filter-btn {
  appearance: none;
  border: 1px solid transparent;
  background: transparent;
  border-radius: var(--radius-pill);
  padding: 8px 18px;
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--deep);
  cursor: pointer;
  transition: background .2s var(--ease), color .2s var(--ease);
}
.filter-btn:hover { background: rgba(13, 124, 143, .12); }
.filter-btn[aria-pressed="true"] { background: var(--deep); color: #FFFFFF; }

.filter-item[hidden] { display: none; }
[data-filter-empty] {
  padding: 26px 0;
  font-size: 15px;
  color: var(--rock);
  letter-spacing: .03em;
}

/* ---------- 显现 ---------- */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .72s var(--ease), transform .72s var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}
html.js [data-reveal].is-revealed { opacity: 1; transform: none; }

html.js .band {
  transform: scaleX(0);
  transition: transform .9s var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}
html.js .band.is-revealed { transform: scaleX(1); }

/* ---------- 返回顶部 ---------- */
.to-top {
  position: fixed;
  right: clamp(16px, 2.6vw, 34px);
  bottom: clamp(16px, 2.6vw, 34px);
  z-index: 70;
  width: 50px;
  height: 50px;
  display: grid;
  place-items: center;
  border: 1px solid var(--trace);
  border-radius: 50%;
  background: var(--chalk);
  color: var(--deep);
  box-shadow: var(--shadow-island);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity .25s var(--ease), transform .25s var(--ease), visibility .25s, background .22s var(--ease), color .22s var(--ease);
}
.to-top[data-visible] { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { background: var(--deep); color: #FFFFFF; }
.to-top span { font-size: 17px; line-height: 1; }

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(64px, 10vw, 132px);
  padding: clamp(44px, 6vw, 82px) 0 34px;
  background: var(--deep);
  background-image:
    radial-gradient(900px 460px at 88% 0%, rgba(13, 124, 143, .30), transparent 62%),
    radial-gradient(680px 420px at 4% 100%, rgba(75, 63, 146, .26), transparent 66%);
  background-repeat: no-repeat;
  color: #D6E2E7;
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--lake), var(--indigo) 34%, var(--orange) 68%, var(--gold));
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: clamp(24px, 4vw, 72px);
  align-items: end;
  padding-bottom: clamp(34px, 4.6vw, 58px);
  border-bottom: 1px solid rgba(185, 203, 211, .26);
}

.footer-lede {
  margin: 0;
  max-width: 20em;
  font-family: var(--font-display);
  font-size: clamp(21px, 2.3vw, 33px);
  line-height: 1.5;
  letter-spacing: .01em;
  color: #F1F6F8;
}

.footer-lines { display: flex; flex-direction: column; }
.footer-line {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 4px;
  border-top: 1px solid rgba(185, 203, 211, .22);
  color: #E4EDF1;
  transition: color .2s var(--ease), padding-left .26s var(--ease), border-color .2s var(--ease);
}
.footer-line:last-child { border-bottom: 1px solid rgba(185, 203, 211, .22); }
.footer-line:hover { color: #FFFFFF; padding-left: 16px; border-color: var(--orange); }
.footer-line__num {
  flex: 0 0 auto;
  font-size: 12.5px;
  letter-spacing: .12em;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}
.footer-line__label { font-size: 16px; letter-spacing: .03em; }

.footer-mid { padding: clamp(30px, 4vw, 52px) 0; }
.footer-nav { display: flex; flex-wrap: wrap; gap: clamp(32px, 6vw, 104px); }
.footer-nav__title {
  margin: 0 0 14px;
  font-family: var(--font-body);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: .2em;
  color: var(--trace);
}
.footer-nav__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.footer-nav__list li { margin: 0; }
.footer-nav__list a { color: #C9D8DF; font-size: 14.5px; letter-spacing: .02em; }
.footer-nav__list a:hover { color: #FFFFFF; text-decoration: underline; text-underline-offset: 5px; }

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 22px 48px;
  padding-top: 28px;
  border-top: 1px solid rgba(185, 203, 211, .24);
}
.footer-meta { display: flex; flex-wrap: wrap; gap: 18px 52px; }
.footer-meta__item { max-width: 22em; }
.footer-meta dt {
  margin-bottom: 6px;
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--trace);
}
.footer-meta dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.6;
  color: #EAF1F4;
  word-break: break-word;
}
.footer-legal {
  margin: 0;
  align-self: flex-end;
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--trace);
}

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .nav-toggle { display: inline-flex; }

  .nav-pill {
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    right: 0;
    padding: 10px;
    border-radius: 24px;
    background: var(--chalk);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity .22s var(--ease), transform .22s var(--ease), visibility .22s;
  }
  .nav-pill[data-open] {
    opacity: 1;
    visibility: visible;
    transform: none;
  }
  .nav-pill__list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 0;
  }
  .nav-link {
    padding: 13px 16px;
    border-radius: 16px;
    font-size: 16px;
    white-space: normal;
  }
  .nav-link[aria-current="page"] { background: var(--deep); }
}

@media (max-width: 960px) {
  .footer-top { grid-template-columns: minmax(0, 1fr); align-items: start; }
  .footer-lede { max-width: 24em; }
}

@media (max-width: 900px) {
  .grid--2, .grid--3, .grid--sidebar, .grid--sidebar-left {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 680px) {
  body { font-size: 16px; }
  .brand__tagline { display: none; }
  .brand { padding: 8px 16px 8px 10px; }
  .footer-meta { flex-direction: column; gap: 16px; }
  .footer-legal { align-self: flex-start; }
  .panel { padding: 20px; }
  .filter-bar { border-radius: 20px; }
  .filter-btn { padding: 8px 14px; font-size: 13.5px; }
}

@media (min-width: 900px) {
  body { background-attachment: fixed; }
}

/* ---------- 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  html.js [data-reveal] { opacity: 1; transform: none; }
  html.js .band { transform: none; }
}