/* ============================================================
   KAIYUN 体育入口 · 共享样式 /assets/site.css
   母题：高原夜空竞技控制台 / 框架式导航 / 纵向长卷 / 档案卡
   ============================================================ */

/* ---------- 01 设计令牌 ---------- */
:root {
  --ink: #0B1B2B;
  --ink-2: #132B45;
  --wine: #6E1B2E;
  --wine-deep: #3B0D18;
  --saffron: #B3252B;
  --saffron-hi: #C92C33;
  --barley: #E0A83A;
  --cyan: #35C4C8;
  --orange: #F08238;
  --mist: #9BB0C4;
  --glass: #E8F0F7;
  --paper: #F4F1E8;
  --paper-ink: #26313D;

  --rail-w: 264px;
  --top-h: 64px;
  --maxw: 1180px;
  --radius: 14px;

  --fs-1: 14px;
  --fs-2: 16px;
  --fs-3: 20px;
  --fs-4: 25px;
  --fs-5: 31px;
  --fs-6: 44px;
  --fs-7: 62px;
  --fs-8: 96px;

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

  --line: rgba(155, 176, 196, .28);
  --line-soft: rgba(155, 176, 196, .16);
  --progress: 0;
}

/* ---------- 02 Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  padding-top: var(--top-h);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  color: var(--glass);
  background-color: var(--ink);
  background-image:
    radial-gradient(900px 620px at 80% -8%, rgba(53, 196, 200, .14), transparent 62%),
    radial-gradient(720px 540px at 6% 16%, rgba(179, 37, 43, .16), transparent 64%),
    radial-gradient(640px 720px at 94% 86%, rgba(224, 168, 58, .10), transparent 62%);
  background-attachment: fixed;
}

body[data-nav-locked] { overflow: hidden; }

img, svg, video { max-width: 100%; display: block; }
figure { margin: 0; }
ul, ol { margin: 0; padding: 0; }

a { color: var(--barley); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: var(--glass); }

button { font: inherit; color: inherit; }

::selection { background: var(--saffron); color: var(--paper); }

:focus-visible {
  outline: 2px solid var(--barley);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 03 中文排版 ---------- */
h1, h2, h3, h4 {
  margin: 0 0 .45em;
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--glass);
}

h1 { font-size: clamp(40px, 7.2vw, var(--fs-8)); font-weight: 800; }
h2 { font-size: clamp(28px, 4.4vw, var(--fs-6)); }
h3 { font-size: clamp(21px, 2.6vw, var(--fs-4)); }
h4 { font-size: var(--fs-3); }

p { margin: 0 0 1em; max-width: 42ch; }
p:last-child { margin-bottom: 0; }

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .04em;
}

.eyebrow {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--barley);
}

.lead { font-size: var(--fs-3); color: var(--mist); max-width: 38ch; }

main { display: block; }
#main-content:focus { outline: none; }

/* ---------- 04 布局与容器 ---------- */
.shell {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(22px, 4.2vw, 60px);
}

.section { padding: clamp(36px, 6vw, 84px) 0; }

.stack { display: flex; flex-direction: column; gap: 22px; }
.cluster { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; }

.grid { display: grid; gap: clamp(18px, 2.6vw, 34px); grid-template-columns: 1fr; }

@media (min-width: 760px) {
  .grid--split { grid-template-columns: 1fr 1fr; }
  .grid--trio { grid-template-columns: repeat(3, 1fr); }
}

@media (min-width: 1000px) {
  .grid--asym { grid-template-columns: minmax(0, 7fr) minmax(0, 4fr); align-items: start; }
}

/* ---------- 05 章节（档案夹封面） ---------- */
.chapter {
  position: relative;
  padding: clamp(46px, 7vw, 104px) 0;
}

.chapter--paper {
  background: var(--paper);
  color: var(--paper-ink);
}
.chapter--paper h1,
.chapter--paper h2,
.chapter--paper h3 { color: var(--ink); }
.chapter--paper p { color: #3A4756; }
.chapter--paper a { color: var(--saffron); }
.chapter--paper .chapter__num { color: var(--saffron); }
.chapter--paper .chapter__label { color: #6B7C8C; }
.chapter--paper .lead { color: #4A5A6A; }

.chapter__band {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 18px;
  padding-top: 18px;
  border-top: 2px solid var(--saffron);
  margin-bottom: clamp(20px, 3vw, 38px);
}

.chapter__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(44px, 7vw, var(--fs-7));
  line-height: .9;
  font-weight: 700;
  color: var(--barley);
}

.chapter__title { margin: 0; flex: 1 1 260px; }

.chapter__label {
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mist);
  margin: 0;
}

/* ---------- 06 资料卡与标签 ---------- */
.file-card {
  position: relative;
  padding: clamp(20px, 2.4vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(232, 240, 247, .09), rgba(232, 240, 247, .03));
  backdrop-filter: blur(10px);
  transition: transform .2s ease, border-color .2s ease;
}
.file-card:hover { transform: translateY(-2px); border-color: rgba(224, 168, 58, .62); }

.chapter--paper .file-card {
  background: #FFFFFF;
  border-color: rgba(38, 49, 61, .16);
}

.file-card__tag {
  position: absolute;
  top: 0;
  right: clamp(16px, 2vw, 24px);
  transform: translateY(-50%);
  padding: 4px 11px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--ink-2);
  color: var(--barley);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  white-space: nowrap;
}
.chapter--paper .file-card__tag { background: var(--ink); color: var(--glass); border-color: transparent; }

.file-card__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 4vw, var(--fs-5));
  line-height: 1.1;
  color: var(--glass);
  margin-bottom: 6px;
}
.chapter--paper .file-card__num { color: var(--ink); }

.file-card__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: var(--fs-3);
  font-weight: 700;
  letter-spacing: -.01em;
}
.chapter--paper .file-card__title { color: var(--ink); }

.file-card__text { margin: 0; font-size: var(--fs-2); color: var(--mist); max-width: 40ch; }
.chapter--paper .file-card__text { color: #4A5A6A; }

.file-card__meta {
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--mist);
}

.tagrow { display: flex; flex-wrap: wrap; gap: 10px; }

.tag {
  padding: 6px 15px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: .06em;
  cursor: pointer;
  transition: background .2s ease, color .2s ease, border-color .2s ease;
}
.tag:hover { color: var(--glass); border-color: rgba(224, 168, 58, .6); }
.tag[aria-selected="true"],
.tag.is-active {
  background: linear-gradient(90deg, var(--cyan), var(--orange));
  border-color: transparent;
  color: #08131F;
  font-weight: 600;
}

/* ---------- 07 数据组件 ---------- */
.bar {
  height: 8px;
  border-radius: 999px;
  background: rgba(155, 176, 196, .16);
  overflow: hidden;
}
.bar__fill {
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
}
.bar__fill--cool { background: linear-gradient(90deg, #1E8E9E, var(--cyan)); }
.bar__fill--warm { background: linear-gradient(90deg, var(--saffron), var(--orange)); }

.matrix {
  width: 100%;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
}
.matrix th,
.matrix td {
  padding: 12px 14px;
  text-align: left;
  font-size: var(--fs-2);
  border-bottom: 1px solid var(--line-soft);
}
.matrix thead th {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--mist);
}
.matrix tbody tr:hover { background: rgba(232, 240, 247, .05); }
.matrix .num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.matrix .is-active { background: rgba(224, 168, 58, .14); }
.matrix--paper { color: var(--paper-ink); }
.matrix--paper thead th { color: #6B7C8C; }
.matrix--paper th,
.matrix--paper td { border-bottom-color: rgba(38, 49, 61, .16); }
.matrix--paper tbody tr:hover { background: rgba(38, 49, 61, .05); }
.matrix--paper .is-active { background: rgba(224, 168, 58, .22); }

.stat { display: flex; flex-direction: column; gap: 4px; }
.stat__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(44px, 8vw, var(--fs-8));
  line-height: .95;
  font-weight: 700;
  color: var(--glass);
  letter-spacing: -.03em;
}
.stat__label {
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: .16em;
  color: var(--mist);
}

/* ---------- 08 折叠问答 ---------- */
.qa {
  margin: 0 0 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(232, 240, 247, .04);
}
.qa__q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 20px;
  font-family: var(--font-display);
  font-size: var(--fs-3);
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}
.qa__q::-webkit-details-marker { display: none; }
.qa__q::after {
  content: "+";
  font-family: var(--font-mono);
  color: var(--barley);
  font-size: var(--fs-4);
  line-height: 1;
}
.qa[open] .qa__q::after { content: "–"; }
.qa__a {
  padding: 0 20px 18px;
  font-size: var(--fs-2);
  color: var(--mist);
}
.qa__a p { max-width: 60ch; }

.chapter--paper .qa { background: #FFFFFF; border-color: rgba(38, 49, 61, .16); }
.chapter--paper .qa__a { color: #4A5A6A; }

/* ---------- 09 图片容器（页面阶段放图） ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  aspect-ratio: 16 / 10;
  background: linear-gradient(160deg, var(--ink-2), var(--ink));
}
.media-frame img,
.media-frame svg,
.media-frame video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }

.media-frame--grid::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(155, 176, 196, .18) 1px, transparent 1px),
    linear-gradient(90deg, rgba(155, 176, 196, .18) 1px, transparent 1px);
  background-size: 48px 48px;
}

.media-frame__cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 30px 16px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--glass);
  background: linear-gradient(180deg, transparent, rgba(11, 27, 43, .88));
}

/* ---------- 10 按钮与链接 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: 10px;
  font-family: var(--font-display);
  font-size: var(--fs-2);
  font-weight: 600;
  letter-spacing: .01em;
  text-decoration: none;
  cursor: pointer;
  transition: background .2s ease, color .2s ease, border-color .2s ease;
}
.btn--primary {
  background: var(--saffron);
  color: var(--paper);
  border-color: rgba(244, 241, 232, .18);
}
.btn--primary:hover { background: var(--saffron-hi); color: var(--paper); }
.btn--ghost {
  background: transparent;
  color: var(--glass);
  border-color: rgba(155, 176, 196, .45);
}
.btn--ghost:hover { color: var(--barley); border-color: var(--barley); }

.link-sweep {
  position: relative;
  color: var(--barley);
  text-decoration: none;
}
.link-sweep::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .25s ease;
}
.link-sweep:hover::after,
.link-sweep:focus-visible::after { transform: scaleX(1); }

/* ---------- 11 面包屑 ---------- */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  color: var(--mist);
}
.crumbs a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.crumbs a:hover { color: var(--barley); border-bottom-color: var(--barley); }
.crumbs [aria-current="page"] { color: var(--glass); }
.crumbs__sep { color: rgba(155, 176, 196, .5); }

/* ---------- 12 跳过链接 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 10px 16px;
  border-radius: 8px;
  background: var(--barley);
  color: #0B1B2B;
  font-weight: 700;
  text-decoration: none;
  transform: translateY(-180%);
  transition: transform .18s ease;
}
.skip-link:focus { transform: none; color: #0B1B2B; }

/* ---------- 13 页头：框架式导航 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 0;
  z-index: 120;
}

.scroll-progress {
  position: fixed;
  top: var(--top-h);
  left: 0;
  right: 0;
  height: 3px;
  z-index: 124;
  pointer-events: none;
  background: linear-gradient(90deg, var(--cyan), var(--barley), var(--saffron));
  transform: scaleX(var(--progress, 0));
  transform-origin: left center;
}

.rail-scrim {
  position: fixed;
  inset: 0;
  display: none;
  padding: 0;
  border: 0;
  background: rgba(11, 27, 43, .74);
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s ease;
  z-index: 128;
}

.site-rail {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--rail-w);
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding: 26px 22px 22px;
  overflow-y: auto;
  z-index: 132;
  background: linear-gradient(190deg, rgba(19, 43, 69, .95), rgba(11, 27, 43, .98));
  border-right: 1px solid var(--line);
  backdrop-filter: blur(14px);
  transition: transform .28s ease;
}

.rail-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}
.rail-head__ann {
  margin: 0;
  writing-mode: vertical-rl;
  max-height: 148px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .34em;
  color: var(--mist);
}
.rail-head__mono {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--barley);
}

.rail-close {
  display: none;
  align-self: flex-start;
  padding: 7px 14px;
  border: 1px solid rgba(155, 176, 196, .4);
  border-radius: 8px;
  background: transparent;
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 13px;
  cursor: pointer;
}
.rail-close:hover { color: var(--glass); border-color: var(--barley); }

.rail-nav { display: flex; flex-direction: column; }
.rail-nav__title {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--mist);
}
.rail-nav__list { list-style: none; display: flex; flex-direction: column; gap: 2px; }
.rail-nav__list a {
  position: relative;
  display: block;
  padding: 10px 12px 10px 18px;
  color: var(--mist);
  font-size: 17px;
  font-weight: 500;
  text-decoration: none;
  border-radius: 8px;
  transition: color .18s ease, background .18s ease;
}
.rail-nav__list a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 3px;
  height: 0;
  background: var(--barley);
  transform: translateY(-50%);
  transition: height .2s ease;
}
.rail-nav__list a:hover { color: var(--glass); background: rgba(232, 240, 247, .05); }
.rail-nav__list a:hover::before { height: 58%; }
.rail-nav__list a[aria-current="page"] {
  color: var(--glass);
  background: rgba(224, 168, 58, .12);
  font-weight: 600;
}
.rail-nav__list a[aria-current="page"]::before { height: 76%; }

.rail-meta {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}
.rail-meta__mono {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist);
}
.rail-meta__dim { font-size: 12px; color: rgba(155, 176, 196, .72); }

.site-topline {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--top-h);
  z-index: 126;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 0 clamp(14px, 3vw, 30px);
  background: linear-gradient(180deg, rgba(11, 27, 43, .95), rgba(11, 27, 43, .84));
  border-bottom: 2px solid var(--saffron);
  backdrop-filter: blur(12px);
}

.brand-mini {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--glass);
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -.01em;
  text-decoration: none;
}
.brand-mini:hover { color: var(--glass); }
.brand-mini__mark {
  padding: 3px 7px;
  border: 1px solid rgba(224, 168, 58, .55);
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--barley);
}
.brand-mini__name { font-size: 17px; }

.topline-note {
  margin: 0 0 0 auto;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--mist);
}
.topline-note + .btn { margin-left: 0; }

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border: 1px solid rgba(155, 176, 196, .4);
  border-radius: 10px;
  background: transparent;
  color: var(--glass);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  cursor: pointer;
}
.nav-toggle:hover { border-color: var(--barley); color: var(--barley); }
.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
}
.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }

/* 桌面端 */
@media (min-width: 1024px) {
  body { padding-left: var(--rail-w); }
  .scroll-progress { left: var(--rail-w); }
  .site-topline { left: var(--rail-w); }
  .nav-toggle { display: none; }
}

/* 平板与手机：抽屉式导航 */
@media (max-width: 1023px) {
  .rail-scrim { display: block; }
  .site-rail {
    width: min(86vw, 320px);
    transform: translateX(-102%);
    box-shadow: 0 24px 60px rgba(0, 0, 0, .45);
  }
  .rail-close { display: inline-flex; align-items: center; justify-content: center; }
  .site-header[data-open] .site-rail { transform: none; }
  .site-header[data-open] .rail-scrim { opacity: 1; pointer-events: auto; }
  .brand-mini__name { font-size: 16px; }
}

@media (max-width: 900px) {
  .topline-note { display: none; }
  .brand-mini { margin-right: auto; }
}

@media (max-width: 560px) {
  :root { --top-h: 58px; --fs-8: 58px; --fs-7: 42px; }
  body { font-size: 16px; }
  .brand-mini__mark { font-size: 11px; }
  .brand-mini__name { font-size: 15px; }
  .site-topline .btn { padding: 9px 13px; font-size: 14px; }
  p { max-width: 100%; }
}

/* ---------- 14 页脚 ---------- */
.site-footer {
  margin-top: clamp(40px, 6vw, 90px);
  border-top: 2px solid var(--saffron);
  background: linear-gradient(180deg, #5C1626, #36101B 62%, #240A12);
  color: var(--glass);
}

.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(36px, 5vw, 72px) clamp(20px, 4vw, 60px);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 48px);
}

@media (min-width: 760px) {
  .footer-grid { grid-template-columns: 1.4fr 1fr 1.2fr; }
}

.footer-col { min-width: 0; }

.footer-mark {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-4);
  letter-spacing: .22em;
  color: var(--barley);
}

.footer-claim {
  margin: 14px 0 0;
  font-size: var(--fs-2);
  line-height: 1.7;
  color: rgba(232, 240, 247, .86);
  max-width: 34ch;
}
.footer-claim--dim {
  margin-top: 8px;
  font-size: var(--fs-1);
  color: rgba(155, 176, 196, .92);
}

.footer-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .18em;
  color: var(--barley);
}

.footer-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: var(--fs-2);
}
.footer-list a {
  color: rgba(232, 240, 247, .84);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s ease, border-color .18s ease;
}
.footer-list a:hover { color: var(--barley); border-bottom-color: var(--barley); }
.footer-list--meta { font-size: 15px; color: rgba(232, 240, 247, .78); }
.footer-list--meta li { line-height: 1.6; }

.footer-base {
  margin-top: clamp(28px, 4vw, 48px);
  padding-top: 22px;
  border-top: 1px solid rgba(232, 240, 247, .22);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 26px;
}

.footer-base__legal {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--mist);
}

.footer-base__links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  font-size: 14px;
}
.footer-base__links a {
  color: rgba(232, 240, 247, .84);
  text-decoration: none;
}
.footer-base__links a:hover { color: var(--barley); text-decoration: underline; text-underline-offset: 3px; }

.to-top {
  margin-left: auto;
  padding: 10px 18px;
  border: 1px solid rgba(224, 168, 58, .5);
  border-radius: 999px;
  background: rgba(11, 27, 43, .9);
  color: var(--barley);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  cursor: pointer;
  backdrop-filter: blur(8px);
  transition: background .2s ease, color .2s ease;
}
.to-top:hover { background: var(--barley); color: #0B1B2B; }
.to-top[hidden] { display: none; }

@media (max-width: 560px) {
  .to-top { margin-left: 0; }
}

/* ---------- 15 显现动效与减弱动效 ---------- */
html.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
}
html.js-reveal [data-reveal].is-visible {
  opacity: 1;
  transform: none;
  transition: opacity .55s ease, transform .55s ease;
}

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