/* ==========================================================================
   安博赛场 · 共享样式表  /assets/site.css
   赛场信号系统：炭黑舞台 + 红黄信号 + 纸张叠层
   ========================================================================== */

/* ---------- 1. 变量 ---------- */
:root {
  --ink: #0B0F0E;
  --bos: #0F2A22;
  --pitch: #173B2E;
  --red: #E33A2E;
  --red-deep: #8E241C;
  --yellow: #F6C445;
  --paper: #F1E9DA;
  --chalk: #F7F4EC;
  --steel: #6E8390;
  --rule: #C9C0AE;
  --focus: #5B8FA8;

  --chalk-dim: rgba(247, 244, 236, 0.74);
  --rule-soft: rgba(201, 192, 174, 0.24);
  --rule-hair: rgba(201, 192, 174, 0.14);

  --font-display: "Oswald", "Arial Narrow", "Noto Sans SC", "PingFang SC", sans-serif;
  --font-editorial: "Noto Serif SC", "Songti SC", "SimSun", serif;
  --font-body: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Noto Sans SC", monospace;

  --radius-pill: 999px;
  --radius-card: 16px;
  --gutter: clamp(16px, 3.4vw, 48px);
  --section-y: clamp(48px, 7vw, 96px);
}

/* ---------- 2. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background-color: var(--ink);
  color: var(--chalk);
  font-family: var(--font-body);
  font-size: clamp(16px, 0.3vw + 15.2px, 17.6px);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

a {
  color: inherit;
  text-decoration: none;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

p { margin: 0; }

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: 0.005em;
  text-wrap: balance;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

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

/* ---------- 3. 通用工具 ---------- */
.container {
  width: 100%;
  max-width: 1416px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.stack { display: grid; gap: var(--stack-gap, 16px); }

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* 跳至主要内容 */
.skip-link {
  position: fixed;
  top: -120px;
  left: var(--gutter);
  z-index: 220;
  padding: 0.7em 1.2em;
  border-radius: 10px;
  background: var(--yellow);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.5);
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 14px;
}

/* 阅读进度信号条 */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 130;
  background: linear-gradient(90deg, var(--red) 0%, var(--yellow) 100%);
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}

/* ---------- 4. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  padding: 0.74em 1.35em;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease,
              border-color 0.18s ease, transform 0.18s ease;
}

.btn--primary {
  background: var(--red);
  color: var(--chalk);
  border-color: var(--red);
}
.btn--primary:hover {
  background: var(--red-deep);
  border-color: var(--red-deep);
  transform: translateY(-2px);
}

.btn--yellow {
  background: var(--yellow);
  color: var(--ink);
  border-color: var(--yellow);
}
.btn--yellow:hover {
  background: #FFD75E;
  border-color: #FFD75E;
  transform: translateY(-2px);
}

.btn--ghost {
  background: transparent;
  color: var(--chalk);
  border-color: var(--rule-soft);
}
.btn--ghost:hover {
  color: var(--yellow);
  border-color: var(--yellow);
  transform: translateY(-2px);
}

.btn--quiet {
  background: rgba(247, 244, 236, 0.08);
  color: var(--chalk);
  border-color: transparent;
}
.btn--quiet:hover {
  background: rgba(247, 244, 236, 0.16);
  transform: translateY(-2px);
}

/* ---------- 5. 页头：悬浮胶囊 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  padding: 14px var(--gutter) 0;
  transition: padding-top 0.28s ease;
}

.header-shell {
  position: relative;
  display: flex;
  align-items: center;
  gap: clamp(8px, 1.2vw, 18px);
  width: 100%;
  max-width: 1416px;
  margin-inline: auto;
  padding: 8px 10px 8px 8px;
  background: linear-gradient(118deg, rgba(15, 42, 34, 0.96) 0%, rgba(11, 15, 14, 0.93) 100%);
  border: 1px solid var(--rule-soft);
  border-radius: var(--radius-pill);
  box-shadow: 0 16px 42px rgba(0, 0, 0, 0.46);
  -webkit-backdrop-filter: blur(14px) saturate(1.15);
  backdrop-filter: blur(14px) saturate(1.15);
  transition: border-radius 0.28s ease, padding 0.28s ease,
              background 0.28s ease, box-shadow 0.28s ease;
}

.site-header[data-condensed="true"] { padding-top: 7px; }

.site-header[data-condensed="true"] .header-shell {
  padding-block: 4px;
  border-radius: 12px;
  background: linear-gradient(118deg, rgba(15, 42, 34, 0.99) 0%, rgba(11, 15, 14, 0.99) 100%);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.6);
}

/* 品牌浮岛 */
.brand-island {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  padding: 5px 18px 5px 5px;
  border: 1px solid var(--rule-soft);
  border-radius: var(--radius-pill);
  background: rgba(23, 59, 46, 0.86);
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.brand-island:hover {
  border-color: var(--yellow);
  transform: translateY(-1px);
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--red);
  color: var(--chalk);
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  transform: rotate(-4deg);
  box-shadow: inset 0 0 0 2px rgba(247, 244, 236, 0.24);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  color: var(--chalk);
}

.brand-sub {
  margin-top: 3px;
  font-family: var(--font-mono);
  font-size: 0.55rem;
  letter-spacing: 0.22em;
  color: var(--steel);
  text-transform: uppercase;
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  padding: 9px 15px;
  border: 1px solid var(--rule-soft);
  border-radius: var(--radius-pill);
  background: rgba(23, 59, 46, 0.92);
  color: var(--chalk);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  cursor: pointer;
  transition: border-color 0.18s ease, color 0.18s ease;
}
.nav-toggle:hover {
  border-color: var(--yellow);
  color: var(--yellow);
}

.nav-toggle-mark {
  display: grid;
  gap: 4px;
  width: 16px;
}
.nav-toggle-mark span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-mark span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-mark span:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-mark span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* 主导航 */
.site-nav {
  display: block;
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-list a {
  display: block;
  padding: 9px 12px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  color: var(--chalk-dim);
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  white-space: nowrap;
  transition: color 0.18s ease, background-color 0.18s ease, border-color 0.18s ease;
}

.nav-list a:hover {
  color: var(--chalk);
  background: rgba(246, 196, 69, 0.12);
  border-color: rgba(246, 196, 69, 0.38);
}

.nav-list a[aria-current="page"] {
  color: var(--ink);
  background: var(--yellow);
  border-color: var(--yellow);
  font-weight: 700;
}

/* 页头工具区 */
.header-utility {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 0 0 auto;
  margin-left: 4px;
}

.utility-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 12px;
  border: 1px dashed transparent;
  border-radius: var(--radius-pill);
  color: var(--steel);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  transition: color 0.18s ease, border-color 0.18s ease;
}
.utility-link:hover {
  color: var(--yellow);
  border-color: rgba(246, 196, 69, 0.42);
}

.utility-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--red);
  box-shadow: 0 0 0 3px rgba(227, 58, 46, 0.24);
}

.header-cta {
  padding: 0.7em 1.15em;
  font-size: 0.82rem;
}

/* ---------- 6. 页脚 ---------- */
.site-footer {
  margin-top: clamp(48px, 8vw, 120px);
  padding-bottom: clamp(22px, 3.5vw, 44px);
  background: linear-gradient(180deg, var(--bos) 0%, var(--ink) 100%);
  border-top: 1px solid var(--rule-soft);
  color: var(--chalk);
}

.footer-signal {
  height: 5px;
  background: linear-gradient(90deg,
      var(--red) 0 22%,
      var(--yellow) 22% 30%,
      var(--pitch) 30% 100%);
}

.footer-main {
  display: grid;
  grid-template-columns:
    minmax(220px, 1.6fr)
    repeat(3, minmax(96px, 0.62fr))
    minmax(230px, 1.3fr);
  gap: clamp(22px, 3vw, 44px);
  padding-block: clamp(36px, 5.5vw, 68px) clamp(26px, 4vw, 46px);
}

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

.footer-lockup {
  font-family: var(--font-display);
  font-size: 1.32rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--chalk);
}

.footer-lockup-sub {
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--steel);
}

.footer-tagline {
  margin-top: 16px;
  font-family: var(--font-editorial);
  font-size: 1rem;
  letter-spacing: 0.06em;
  color: var(--yellow);
}

.footer-summary {
  margin-top: 10px;
  max-width: 34ch;
  color: var(--chalk-dim);
  font-size: 0.89rem;
  line-height: 1.75;
}

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

.footer-heading {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--yellow);
}

.footer-heading::after {
  content: "";
  flex: 1 1 auto;
  height: 1px;
  background: var(--rule-soft);
}

.footer-list li + li { margin-top: 10px; }

.footer-list a {
  display: inline-block;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  color: var(--chalk-dim);
  font-size: 0.92rem;
  transition: color 0.18s ease, border-color 0.18s ease;
}
.footer-list a:hover {
  color: var(--yellow);
  border-color: var(--yellow);
}

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

.contact-list li {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px dashed var(--rule-hair);
}

.contact-label {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel);
}

.contact-value {
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--chalk);
  word-break: break-word;
}

.contact-note {
  margin-top: 14px;
  padding-left: 11px;
  border-left: 2px solid var(--yellow);
  font-size: 0.76rem;
  line-height: 1.7;
  color: var(--steel);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding-top: clamp(16px, 2.2vw, 26px);
  border-top: 1px solid var(--rule-soft);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 20px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--steel);
}

.footer-legal a {
  color: var(--chalk-dim);
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}
.footer-legal a:hover {
  color: var(--yellow);
  border-color: var(--yellow);
}

.footer-icp {
  padding: 3px 10px;
  border: 1px solid var(--rule-soft);
  border-radius: var(--radius-pill);
  color: var(--steel);
  letter-spacing: 0.1em;
}

/* ---------- 7. 版面与章节 ---------- */
.section {
  padding-block: var(--section-y);
}

.section--paper {
  background: var(--paper);
  color: var(--ink);
}
.section--paper .section-head__note { color: #4A4A42; }
.section--paper .card {
  background: #FBF6EC;
  border-color: rgba(11, 15, 14, 0.14);
  box-shadow: 6px 6px 0 -1px rgba(11, 15, 14, 0.12);
  color: var(--ink);
}
.section--paper .card__label { color: var(--red-deep); }
.section--paper .card__meta { color: #5B625F; }

.section--pit {
  background: var(--pitch);
}

.section-head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(24px, 3vw, 40px);
}

.section-head__index {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--yellow);
}

.section-head__title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.6rem);
  line-height: 1.1;
}

.section-head__note {
  max-width: 56ch;
  color: var(--chalk-dim);
  font-size: 0.95rem;
}

/* 栅格 */
.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 32px);
}

.grid--split { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }
.grid--halves { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--trio { grid-template-columns: repeat(3, minmax(0, 1fr)); }

/* 正文 */
.prose {
  max-width: 68ch;
}
.prose > * + * { margin-top: 1.05em; }
.prose h2 {
  margin-top: 1.9em;
  font-size: clamp(1.4rem, 2.4vw, 2rem);
}
.prose ul,
.prose ol {
  list-style: disc;
  padding-left: 1.25em;
}
.prose ol { list-style: decimal; }
.prose li + li { margin-top: 0.45em; }
.prose a {
  color: var(--yellow);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.section--paper .prose a { color: var(--red-deep); }

/* ---------- 8. 组件 ---------- */
/* 面包屑 */
.breadcrumb {
  margin: 0 0 clamp(14px, 2vw, 24px);
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--steel);
}

.breadcrumb-list li {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.breadcrumb-list li::after {
  content: "/";
  color: rgba(201, 192, 174, 0.4);
}

.breadcrumb-list li:last-child::after { content: ""; }

.breadcrumb-list a { color: var(--chalk-dim); }
.breadcrumb-list a:hover { color: var(--yellow); }
.breadcrumb-list [aria-current="page"] { color: var(--yellow); }

/* 内页首屏 */
.page-hero {
  padding-block: clamp(32px, 5vw, 76px) clamp(20px, 3.5vw, 44px);
}

.page-hero__eyebrow {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--yellow);
}

.page-hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 5vw, 4.5rem);
  line-height: 1.02;
  letter-spacing: -0.005em;
  margin: 0;
}

.page-hero__lede {
  max-width: 62ch;
  margin-top: clamp(14px, 2vw, 22px);
  color: var(--chalk-dim);
  font-size: clamp(1rem, 1.2vw, 1.08rem);
}

/* 档案卡 */
.card {
  position: relative;
  padding: clamp(18px, 2.2vw, 26px);
  border: 1px solid var(--rule-soft);
  border-radius: var(--radius-card);
  background: var(--pitch);
  box-shadow: 6px 6px 0 -1px rgba(201, 192, 174, 0.16);
  transition: transform 0.18s ease, border-color 0.18s ease;
}
.card:hover {
  transform: translateY(-2px);
  border-color: rgba(246, 196, 69, 0.5);
}

.card__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--yellow);
}

.card__title {
  margin: 0.45em 0 0.35em;
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 1.7vw, 1.4rem);
  line-height: 1.15;
}

.card__meta {
  color: var(--chalk-dim);
  font-size: 0.85rem;
}

/* 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.42em;
  padding: 0.28em 0.72em;
  border: 1px solid var(--rule-soft);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--chalk-dim);
}

.tag--red {
  background: var(--red);
  border-color: var(--red);
  color: var(--chalk);
}

.tag--yellow {
  background: var(--yellow);
  border-color: var(--yellow);
  color: var(--ink);
}

.tag--steel {
  color: var(--steel);
  border-color: rgba(110, 131, 144, 0.55);
}

/* 数据字段 */
.data-key {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--steel);
}

.data-value {
  display: block;
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 0.98rem;
  letter-spacing: 0.02em;
  color: var(--chalk);
}

.section--paper .data-key { color: #5B625F; }
.section--paper .data-value { color: var(--ink); }

/* 图片容器（页面阶段放占位图） */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--rule-soft);
  border-radius: var(--radius-card);
  background: var(--pitch);
}

.media-frame > img,
.media-frame > picture,
.media-frame > picture > img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame > img {
  filter: contrast(1.06) saturate(0.94);
}

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

.media-frame--angled {
  clip-path: polygon(0 0, 100% 0, 100% 88%, 0 100%);
}

.media-frame__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  padding: 0.55em 1em;
  background: rgba(11, 15, 14, 0.8);
  color: var(--chalk);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

/* 折叠档案 */
.disclosure {
  border-bottom: 1px solid var(--rule-soft);
}

.disclosure summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.disclosure summary::-webkit-details-marker { display: none; }

.disclosure summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--yellow);
  transition: transform 0.2s ease;
}

.disclosure[open] summary::after {
  content: "–";
}

.disclosure__body {
  padding-bottom: 18px;
  color: var(--chalk-dim);
  font-size: 0.94rem;
}

/* ---------- 9. 滚动显现 ---------- */
.js-ready [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.js-ready [data-reveal][data-revealed="true"] {
  opacity: 1;
  transform: none;
}

/* ---------- 10. 响应式 ---------- */
@media (max-width: 1079.98px) {
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: calc(100% + 10px);
    display: none;
    margin-left: 0;
    padding: 10px;
    background: linear-gradient(160deg, var(--bos) 0%, var(--ink) 100%);
    border: 1px solid var(--rule-soft);
    border-radius: 20px;
    box-shadow: 0 24px 54px rgba(0, 0, 0, 0.6);
  }

  .site-nav[data-open="true"] { display: block; }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }

  .nav-list a {
    padding: 13px 15px;
    border-radius: 12px;
    font-size: 0.95rem;
    white-space: normal;
  }

  .header-utility { margin-left: 0; }
  .utility-link { display: none; }
}

@media (max-width: 900px) {
  .grid--split,
  .grid--halves,
  .grid--trio {
    grid-template-columns: minmax(0, 1fr);
  }

  .footer-main {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-brand,
  .footer-contact {
    grid-column: 1 / -1;
  }
}

@media (max-width: 680px) {
  .header-cta { display: none; }
  .brand-sub { display: none; }
  .brand-island { padding-right: 14px; }
  .site-header { padding-top: 10px; }
  .footer-legal { font-size: 0.68rem; }
}

@media (max-width: 600px) {
  .footer-main { grid-template-columns: minmax(0, 1fr); }
  .footer-base { flex-direction: column; align-items: flex-start; }
  .contact-list li { grid-template-columns: 40px minmax(0, 1fr); }
}

/* ---------- 11. 动效偏好 ---------- */
@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;
  }

  .js-ready [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .btn:hover,
  .card:hover,
  .brand-island:hover {
    transform: none;
  }
}