/* ==========================================================================
   k8体育赛场 — /assets/site.css
   共享外壳：reset / tokens / 排版 / 刊头 / 页脚 / 基础组件
   ========================================================================== */

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

html,
body,
h1, h2, h3, h4, h5, h6,
p, figure, blockquote, dl, dd, ul, ol {
  margin: 0;
  padding: 0;
}

ul, ol { list-style: none; }

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

button, input, select, textarea { font: inherit; color: inherit; }

button { background: none; border: 0; cursor: pointer; }

[hidden] { display: none !important; }

a { color: inherit; }

table { border-collapse: collapse; width: 100%; }

/* ---------- 2. Tokens ---------- */
:root {
  color-scheme: dark;

  --pitch:        #0C1F1A;
  --shadow-green: #071310;
  --cyan:         #35E8C0;
  --orange:       #FF6A2B;
  --violet:       #7A5CFF;
  --cream:        #F4EFE3;
  --data-white:   #E8F1EC;
  --mist:         #6E8C82;
  --ink:          #14201C;
  --glass:        rgba(244, 239, 227, 0.08);
  --rule:         rgba(232, 241, 236, 0.16);
  --rule-soft:    rgba(232, 241, 236, 0.08);

  --accent:       var(--cyan);
  --accent-2:     var(--orange);

  --font-display: "Oswald", "Barlow Condensed", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body:    "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-data:    "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --font-index:   "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;

  --shell:        1280px;
  --gutter:       24px;
  --grid-gap:     24px;

  --ease:         cubic-bezier(0.22, 1, 0.36, 1);
  --radius:       2px;
}

/* 页面级强调色轮换 */
[data-theme="brand"]   { --accent: var(--cream);  --accent-2: var(--cyan); }
[data-theme="data"]    { --accent: var(--orange); --accent-2: var(--cyan); }
[data-theme="topics"]  { --accent: var(--violet); --accent-2: var(--orange); }
[data-theme="help"]    { --accent: var(--cyan);   --accent-2: var(--mist); }
[data-theme="contact"] { --accent: var(--orange); --accent-2: var(--cyan); }

/* ---------- 3. 基础排版 ---------- */
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  background-color: var(--pitch);
  color: var(--cream);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 夜场胶片颗粒 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 9999;
  pointer-events: none;
  opacity: 0.55;
  background-image:
    radial-gradient(rgba(232, 241, 236, 0.055) 0.5px, transparent 0.5px),
    radial-gradient(rgba(232, 241, 236, 0.038) 0.5px, transparent 0.5px),
    radial-gradient(rgba(53, 232, 192, 0.03) 0.5px, transparent 0.5px);
  background-size: 5px 5px, 9px 9px, 13px 13px;
  background-position: 0 0, 3px 5px, 7px 2px;
}

/* 灯光暗角 */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 9998;
  pointer-events: none;
  background: radial-gradient(135% 105% at 50% 0%, transparent 46%, rgba(4, 10, 8, 0.5) 100%);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.04;
  letter-spacing: 0.015em;
  text-transform: uppercase;
}

p, li { text-wrap: pretty; }

strong { font-weight: 600; color: var(--cream); }

#main-content { scroll-margin-top: 128px; }

/* ---------- 4. 焦点 ---------- */
:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: var(--radius);
}

.skip-link {
  position: fixed;
  left: 16px;
  top: -80px;
  z-index: 200;
  padding: 12px 20px;
  background: var(--accent);
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  border-radius: var(--radius);
  transition: top 0.22s var(--ease);
}
.skip-link:focus { top: 16px; }

/* ---------- 5. 刊头 ---------- */
.masthead {
  position: sticky;
  top: 0;
  z-index: 60;
  color: var(--cream);
  background: linear-gradient(180deg, rgba(7, 19, 16, 0.97) 0%, rgba(12, 31, 26, 0.92) 100%);
  backdrop-filter: blur(16px) saturate(1.15);
  -webkit-backdrop-filter: blur(16px) saturate(1.15);
  border-bottom: 1px solid var(--rule);
}

.masthead__progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: rgba(232, 241, 236, 0.07);
  overflow: hidden;
  pointer-events: none;
}
.masthead__progress-bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
  transition: transform 0.1s linear;
}

.masthead__ticker {
  max-width: var(--shell);
  max-height: 42px;
  margin: 0 auto;
  padding: 9px var(--gutter) 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  overflow: hidden;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mist);
  transition: max-height 0.32s var(--ease), padding 0.32s var(--ease), opacity 0.22s linear;
}
.masthead__tick { color: var(--accent); }
.masthead__note {
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.masthead__inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 6px var(--gutter) 12px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 10px 20px;
  transition: padding 0.3s var(--ease);
}

.masthead__rail {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
  white-space: nowrap;
}
.masthead__rail--end { text-align: right; }

.masthead__brand {
  grid-column: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  text-align: center;
}

.masthead__logo {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  text-decoration: none;
  color: var(--cream);
}

.masthead__mark {
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 500;
  line-height: 1;
  letter-spacing: 0.08em;
  padding: 4px 7px 3px;
  background: var(--accent);
  color: var(--ink);
  border-radius: var(--radius);
}

.masthead__wordmark {
  font-family: var(--font-display);
  font-size: clamp(24px, 3.2vw, 36px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.masthead__tagline {
  max-height: 26px;
  overflow: hidden;
  font-family: var(--font-index);
  font-size: 11px;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--mist);
  transition: max-height 0.3s var(--ease), opacity 0.2s linear;
}

.masthead__side {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 16px;
}

/* 滚动收缩态 */
.masthead[data-compact] .masthead__ticker {
  max-height: 0;
  padding-top: 0;
  opacity: 0;
}
.masthead[data-compact] .masthead__tagline {
  max-height: 0;
  opacity: 0;
}
.masthead[data-compact] .masthead__inner { padding-top: 6px; padding-bottom: 6px; }

/* ---------- 6. 导航 ---------- */
.nav-index {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--rule-soft);
}

.nav-index__list {
  grid-column: 2;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 2px;
}

.nav-index__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 11px 12px;
  color: rgba(232, 241, 236, 0.66);
  font-family: var(--font-index);
  font-size: 14px;
  letter-spacing: 0.04em;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s ease;
}
.nav-index__link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 5px;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: 50% 50%;
  transition: transform 0.26s var(--ease);
}
.nav-index__link:hover { color: var(--cream); }
.nav-index__link:hover::after { transform: scaleX(0.5); }
.nav-index__link[aria-current="page"] { color: var(--cream); }
.nav-index__link[aria-current="page"]::after { transform: scaleX(1); }

.nav-index__num {
  font-family: var(--font-data);
  font-size: 9px;
  letter-spacing: 0.1em;
  color: var(--accent);
  opacity: 0.65;
}

.nav-index__aside {
  grid-column: 3;
  display: flex;
  justify-content: flex-end;
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 8px 12px;
  background: var(--glass);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  color: var(--cream);
  font-family: var(--font-index);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  transition: border-color 0.2s ease, color 0.2s ease;
}
.nav-toggle:hover { border-color: var(--accent); color: var(--accent); }

.nav-toggle__glyph {
  position: relative;
  display: block;
  width: 16px;
  height: 12px;
}
.nav-toggle__glyph i {
  position: absolute;
  left: 0;
  right: 0;
  height: 1.5px;
  background: currentColor;
  border-radius: 1px;
  transition: transform 0.28s var(--ease), opacity 0.18s linear;
}
.nav-toggle__glyph i:nth-child(1) { top: 0; }
.nav-toggle__glyph i:nth-child(2) { top: 5px; }
.nav-toggle__glyph i:nth-child(3) { top: 10px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__glyph i:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__glyph i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__glyph i:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* 遮罩（仅移动端显示） */
.nav-scrim {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 55;
  background: rgba(4, 10, 8, 0.62);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  cursor: pointer;
}

/* ---------- 7. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: 100px;
  background: var(--shadow-green);
  border-top: 1px solid var(--rule);
  color: var(--data-white);
  overflow: hidden;
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(90% 60% at 8% 0%, rgba(53, 232, 192, 0.1), transparent 62%),
    radial-gradient(70% 55% at 92% 4%, rgba(255, 106, 43, 0.08), transparent 66%);
}

.footer-grid {
  position: relative;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 72px var(--gutter) 0;
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 44px 32px;
}

.footer-brand__logo {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 12px;
  text-decoration: none;
  color: var(--cream);
}
.footer-brand__mark {
  font-family: var(--font-data);
  font-size: 11px;
  line-height: 1;
  letter-spacing: 0.08em;
  padding: 4px 7px 3px;
  background: var(--accent);
  color: var(--ink);
  border-radius: var(--radius);
}
.footer-brand__name {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.footer-brand__tagline {
  margin-bottom: 16px;
  font-family: var(--font-index);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--mist);
}
.footer-brand__note {
  max-width: 34ch;
  font-size: 13px;
  line-height: 1.75;
  color: rgba(232, 241, 236, 0.5);
}

.footer-col__title {
  margin-bottom: 14px;
  font-family: var(--font-index);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}

.footer-col__link {
  position: relative;
  display: block;
  padding: 9px 0 9px 14px;
  font-size: 15px;
  color: rgba(232, 241, 236, 0.74);
  text-decoration: none;
  transition: color 0.2s ease;
}
.footer-col__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 2px;
  height: 16px;
  margin-top: -8px;
  background: var(--accent);
  transform: scaleY(0);
  transform-origin: 50% 50%;
  transition: transform 0.24s var(--ease);
}
.footer-col__link:hover,
.footer-col__link:focus-visible { color: var(--cream); }
.footer-col__link:hover::before,
.footer-col__link:focus-visible::before { transform: scaleY(1); }

.footer-contact {
  position: relative;
  max-width: var(--shell);
  margin: 56px auto 0;
  padding: 26px var(--gutter);
  border-top: 1px solid var(--rule-soft);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 10px 40px;
}
.footer-contact__line {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  font-family: var(--font-data);
  font-size: 13px;
  line-height: 1.6;
}
.footer-contact__key {
  font-family: var(--font-index);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist);
}
.footer-contact__val { color: var(--data-white); }

.footer-legal {
  position: relative;
  margin-top: 22px;
  border-top: 1px solid var(--rule-soft);
  background: rgba(0, 0, 0, 0.28);
}
.footer-legal__inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 18px var(--gutter) 26px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 28px;
  font-family: var(--font-index);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}
.footer-legal__icp { font-family: var(--font-data); letter-spacing: 0.1em; }

/* ---------- 8. 通用容器与区块 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.shell--slim { max-width: 820px; }
.shell--wide { max-width: 1480px; }

.section { position: relative; padding-block: 56px; }

.rule {
  height: 1px;
  border: 0;
  background: var(--rule);
}
.rule--accent { background: linear-gradient(90deg, var(--accent), transparent); }

.index-label {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-index);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist);
}
.index-label::before {
  content: "";
  flex: none;
  width: 18px;
  height: 2px;
  background: var(--accent);
}

.data-figure {
  font-family: var(--font-data);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
  color: var(--data-white);
}

/* ---------- 9. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 22px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius);
  color: var(--cream);
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.22s ease, color 0.22s ease, border-color 0.22s ease, transform 0.22s var(--ease);
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--accent { background: var(--accent); color: var(--ink); }
.btn--accent:hover { background: var(--cream); color: var(--ink); }

.btn--ghost {
  background: var(--glass);
  border-color: var(--rule);
  color: var(--cream);
}
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); }

.btn--line {
  background: transparent;
  border-color: var(--accent);
  color: var(--accent);
}
.btn--line:hover { background: var(--accent); color: var(--ink); }

/* ---------- 10. 面板 / 面包屑 / 标签 ---------- */
.panel {
  position: relative;
  padding: 22px 24px;
  background: var(--glass);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.breadcrumb {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 20px var(--gutter) 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--font-index);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
}
.breadcrumb a { text-decoration: none; transition: color 0.2s ease; }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb__sep { color: rgba(232, 241, 236, 0.28); }
.breadcrumb [aria-current="page"] { color: var(--cream); }

/* ---------- 11. 图片容器（页面阶段放置占位） ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  isolation: isolate;
  background: linear-gradient(155deg, #0F2A23 0%, #071310 74%);
  border: 1px solid var(--rule-soft);
  border-radius: var(--radius);
}
.media > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.7) contrast(1.08) brightness(0.82);
}
.media::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(12, 31, 26, 0.1) 0%, rgba(7, 19, 16, 0.62) 100%),
    radial-gradient(70% 55% at 50% 12%, rgba(53, 232, 192, 0.14), transparent 70%);
}
.media::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  opacity: 0.5;
  background-image:
    radial-gradient(rgba(232, 241, 236, 0.05) 0.5px, transparent 0.5px),
    radial-gradient(rgba(232, 241, 236, 0.035) 0.5px, transparent 0.5px);
  background-size: 5px 5px, 8px 8px;
}
.media__caption {
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 14px;
  z-index: 3;
  font-family: var(--font-index);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(232, 241, 236, 0.82);
}

.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3  { aspect-ratio: 4 / 3; }
.media--3x4  { aspect-ratio: 3 / 4; }
.media--1x1  { aspect-ratio: 1 / 1; }
.media--hero { aspect-ratio: 21 / 9; }

/* ---------- 12. 主题筛选 ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 18px;
}
.filter-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: transparent;
  border: 1px solid var(--rule);
  border-radius: 999px;
  color: rgba(232, 241, 236, 0.72);
  font-family: var(--font-index);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}
.filter-chip:hover { color: var(--cream); border-color: var(--accent); }
.filter-chip[aria-pressed="true"] {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--ink);
}
.filter-chip__count {
  font-family: var(--font-data);
  font-size: 11px;
  opacity: 0.72;
}

/* ---------- 13. 进入动画 ---------- */
[data-js="on"] [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.32s var(--ease), transform 0.32s var(--ease);
}
[data-js="on"] [data-reveal][data-visible] {
  opacity: 1;
  transform: none;
}

/* ---------- 14. 响应式 ---------- */
@media (max-width: 1080px) {
  .footer-grid {
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 40px 28px;
  }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 899px) {
  .masthead__rail { display: none; }
  .nav-toggle { display: inline-flex; }

  .masthead__inner {
    grid-template-columns: 1fr auto;
    align-items: center;
  }
  .masthead__brand {
    grid-column: 1;
    align-items: flex-start;
    text-align: left;
  }
  .masthead__side { grid-column: 2; }

  .nav-index {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: block;
    padding: 0 var(--gutter);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    background: rgba(7, 19, 16, 0.97);
    backdrop-filter: blur(20px) saturate(1.2);
    -webkit-backdrop-filter: blur(20px) saturate(1.2);
    border-top: 1px solid var(--accent);
    border-bottom: 1px solid var(--rule);
    transition: max-height 0.42s var(--ease), padding 0.42s var(--ease), opacity 0.26s linear, visibility 0.26s linear;
  }
  .nav-index[data-open] {
    max-height: 78vh;
    overflow-y: auto;
    padding: 14px var(--gutter) 26px;
    opacity: 1;
    visibility: visible;
  }

  .nav-index__list {
    display: block;
    grid-column: auto;
  }
  .nav-index__item { border-bottom: 1px solid var(--rule-soft); }
  .nav-index__link {
    display: flex;
    justify-content: flex-start;
    padding: 15px 4px;
    font-family: var(--font-display);
    font-size: 18px;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
  }
  .nav-index__link::after {
    left: 0;
    right: auto;
    bottom: 0;
    width: 100%;
    transform-origin: 0 50%;
  }
  .nav-index__num { font-size: 11px; }

  .nav-index__aside {
    grid-column: auto;
    justify-content: stretch;
    padding-top: 18px;
  }
  .nav-index__aside .btn { width: 100%; }

  .nav-scrim { display: block; }

  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 34px 22px;
    padding-top: 56px;
  }
  .footer-brand,
  .footer-col:last-child { grid-column: 1 / -1; }

  .site-footer { margin-top: 72px; }
}

@media (max-width: 560px) {
  :root { --gutter: 18px; --grid-gap: 16px; }

  .masthead__inner { padding-top: 8px; padding-bottom: 10px; }
  .masthead__wordmark { font-size: 22px; }
  .masthead__ticker { font-size: 10px; letter-spacing: 0.08em; }

  .section { padding-block: 40px; }
  .media--hero { aspect-ratio: 4 / 3; }

  .footer-contact { margin-top: 40px; }
  .footer-legal__inner { justify-content: flex-start; }
}

/* ---------- 15. 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  [data-js="on"] [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
    transition: opacity 0.2s linear !important;
  }

  .masthead__progress-bar { transition: none !important; }
}