/* ==========================================================================
   三亿体育入口 · 共享站点样式 /assets/site.css
   墨蓝指挥中心基调：冷数据青绿渐变 + 热内容暖橙光晕
   ========================================================================== */

/* ---------- 1. 变量 ---------- */
:root {
  --s3-ink: #060B18;
  --s3-deep: #0C1730;
  --s3-panel: #12224A;
  --s3-cyan: #00E5D0;
  --s3-cyan-bright: #19F0C8;
  --s3-orange: #FF7A1A;
  --s3-amber: #FFC24D;
  --s3-text: #E8F1FF;
  --s3-muted: #8FA6C8;
  --s3-line: #2A3A5C;
  --s3-glass: rgba(232, 241, 255, 0.06);
  --s3-glass-strong: rgba(232, 241, 255, 0.12);
  --s3-radius: 3px;
  --s3-max: 1280px;
  --s3-gap: 20px;
  --s3-ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --s3-font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --s3-font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;
}

/* ---------- 2. 重置与基础 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--s3-ink);
  background-image:
    radial-gradient(1100px 700px at 86% -12%, rgba(255, 122, 26, 0.08), transparent 62%),
    radial-gradient(1200px 820px at 2% 6%, rgba(0, 229, 208, 0.07), transparent 60%);
  background-repeat: no-repeat;
  color: var(--s3-text);
  font-family: var(--s3-font-body);
  font-size: 16px;
  line-height: 1.65;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

button { font: inherit; color: inherit; }

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

p { margin: 0; }

::selection {
  background: rgba(0, 229, 208, 0.32);
  color: #FFFFFF;
}

:focus { outline: 2px solid var(--s3-cyan); outline-offset: 2px; }
:focus:not(:focus-visible) { outline: none; box-shadow: none; }
:focus-visible {
  outline: 2px solid var(--s3-cyan);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(0, 229, 208, 0.22);
}

/* ---------- 3. 排版 ---------- */
.s3-h1 {
  margin: 0;
  font-size: clamp(40px, 6.6vw, 96px);
  font-weight: 900;
  line-height: 0.98;
  letter-spacing: -0.02em;
}

.s3-h2 {
  margin: 0;
  font-size: clamp(26px, 3.2vw, 40px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.s3-h3 {
  margin: 0;
  font-size: clamp(18px, 1.8vw, 24px);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.005em;
}

.s3-lede {
  margin: 0;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.7;
  color: var(--s3-muted);
}

.s3-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--s3-cyan);
}

.s3-eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: currentColor;
}

.s3-num {
  font-family: var(--s3-font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.s3-link {
  color: var(--s3-cyan);
  border-bottom: 1px solid rgba(0, 229, 208, 0.4);
  transition: border-color 180ms var(--s3-ease);
}

.s3-link:hover { border-bottom-color: var(--s3-cyan); color: var(--s3-cyan-bright); }

/* ---------- 4. 布局工具 ---------- */
.s3-container {
  width: min(100% - 40px, var(--s3-max));
  margin-inline: auto;
}

.s3-section { padding-block: clamp(44px, 6.5vw, 96px); }
.s3-section--tight { padding-block: clamp(28px, 4vw, 56px); }

.s3-section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: clamp(20px, 3vw, 36px);
}

.s3-grid {
  display: grid;
  gap: var(--s3-gap);
}

.s3-grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.s3-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.s3-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.s3-span-4 { grid-column: span 4; }
.s3-span-5 { grid-column: span 5; }
.s3-span-6 { grid-column: span 6; }
.s3-span-7 { grid-column: span 7; }
.s3-span-8 { grid-column: span 8; }

.s3-rule {
  height: 1px;
  border: 0;
  margin: 0;
  background: var(--s3-line);
}

/* ---------- 5. 编号章节 ---------- */
.s3-chapter {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 10fr);
  gap: clamp(16px, 3vw, 40px);
  align-items: start;
}

.s3-chapter__num {
  margin: 0;
  font-family: var(--s3-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(52px, 9vw, 132px);
  font-weight: 600;
  line-height: 0.78;
  letter-spacing: -0.04em;
  color: rgba(0, 229, 208, 0.18);
}

@supports (-webkit-text-stroke: 1px #000) {
  .s3-chapter__num {
    color: transparent;
    -webkit-text-stroke: 1px rgba(0, 229, 208, 0.55);
  }
}

/* ---------- 6. 面包屑 ---------- */
.s3-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--s3-muted);
}

.s3-breadcrumb a {
  color: var(--s3-muted);
  transition: color 180ms var(--s3-ease);
}

.s3-breadcrumb a:hover { color: var(--s3-cyan); }

.s3-breadcrumb__sep { color: var(--s3-line); }

/* ---------- 7. 按钮 ---------- */
.s3-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 18px;
  border: 1px solid transparent;
  border-radius: var(--s3-radius);
  font-family: inherit;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition:
    background-color 180ms var(--s3-ease),
    color 180ms var(--s3-ease),
    border-color 180ms var(--s3-ease),
    transform 180ms var(--s3-ease);
}

.s3-btn--ghost {
  color: var(--s3-text);
  border-color: var(--s3-line);
  background-color: rgba(232, 241, 255, 0.03);
}

.s3-btn--ghost:hover {
  color: var(--s3-cyan);
  border-color: rgba(0, 229, 208, 0.55);
  background-color: rgba(0, 229, 208, 0.08);
}

.s3-btn--solid {
  color: #04141B;
  background-color: var(--s3-cyan);
  background-image: linear-gradient(120deg, var(--s3-cyan), var(--s3-cyan-bright));
}

.s3-btn--solid:hover {
  color: #04141B;
  transform: translateY(-1px);
  filter: brightness(1.06);
}

.s3-btn--hot {
  color: #1A0A00;
  background-color: var(--s3-orange);
  background-image: linear-gradient(120deg, var(--s3-orange), var(--s3-amber));
}

.s3-btn--hot:hover {
  color: #1A0A00;
  transform: translateY(-1px);
  filter: brightness(1.06);
}

/* ---------- 8. 标签与进度 ---------- */
.s3-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  border: 1px solid var(--s3-line);
  border-radius: 999px;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--s3-muted);
}

.s3-tag--live {
  color: var(--s3-orange);
  border-color: rgba(255, 122, 26, 0.4);
  background-color: rgba(255, 122, 26, 0.08);
}

.s3-tag--live::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--s3-orange);
  box-shadow: 0 0 10px var(--s3-orange);
}

.s3-tag--data {
  color: var(--s3-cyan);
  border-color: rgba(0, 229, 208, 0.35);
  background-color: rgba(0, 229, 208, 0.07);
}

.s3-meter {
  position: relative;
  width: 100%;
  height: 4px;
  overflow: hidden;
  background-color: rgba(232, 241, 255, 0.1);
}

.s3-meter__fill {
  display: block;
  height: 100%;
  background-image: linear-gradient(90deg, var(--s3-cyan), var(--s3-cyan-bright));
}

/* ---------- 9. 卡片 ---------- */
.s3-card {
  position: relative;
  padding: clamp(18px, 2.2vw, 26px);
  background-color: var(--s3-deep);
  border: 1px solid var(--s3-line);
  border-radius: var(--s3-radius);
}

.s3-card--panel { background-color: var(--s3-panel); }

.s3-card--glass {
  background-color: var(--s3-glass);
  border-color: rgba(232, 241, 255, 0.14);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  backdrop-filter: blur(14px) saturate(140%);
  transition:
    background-color 180ms var(--s3-ease),
    border-color 180ms var(--s3-ease),
    transform 180ms var(--s3-ease);
}

.s3-card--glass:hover {
  background-color: var(--s3-glass-strong);
  border-color: rgba(0, 229, 208, 0.4);
  transform: translateY(-4px);
}

.s3-card--accent::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 2px;
  background-image: linear-gradient(180deg, var(--s3-cyan), transparent);
}

/* ---------- 10. 图片容器基础规则 ---------- */
.s3-media {
  position: relative;
  display: block;
  overflow: hidden;
  isolation: isolate;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--s3-line);
  border-radius: var(--s3-radius);
  background-color: var(--s3-panel);
  background-image: linear-gradient(180deg, #12224A, #0C1730);
}

.s3-media > img,
.s3-media > video,
.s3-media > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.88) contrast(1.08) saturate(0.94);
}

.s3-media::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background-image: linear-gradient(180deg, rgba(6, 11, 24, 0) 42%, rgba(6, 11, 24, 0.82) 100%);
}

.s3-media--4x3 { aspect-ratio: 4 / 3; }
.s3-media--1x1 { aspect-ratio: 1 / 1; }
.s3-media--4x5 { aspect-ratio: 4 / 5; }

.s3-media--cool > img,
.s3-media--cool > video { filter: brightness(0.84) contrast(1.12) saturate(1.05) hue-rotate(-6deg); }

.s3-media--cool::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0.55;
  mix-blend-mode: screen;
  background-image: repeating-linear-gradient(
    180deg,
    rgba(0, 229, 208, 0.12) 0 1px,
    rgba(0, 229, 208, 0) 1px 4px
  );
}

.s3-media--hot::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background-image: radial-gradient(60% 55% at 76% 18%, rgba(255, 122, 26, 0.38), transparent 70%);
}

.s3-media__label {
  position: absolute;
  z-index: 2;
  left: 14px;
  right: 14px;
  bottom: 12px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--s3-text);
}

/* ---------- 11. 页头 ---------- */
.s3-skip {
  position: absolute;
  top: -80px;
  left: 16px;
  z-index: 200;
  padding: 10px 16px;
  border-radius: var(--s3-radius);
  background-color: var(--s3-cyan);
  color: #04141B;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  transition: top 160ms var(--s3-ease);
}

.s3-skip:focus { top: 12px; }

.s3-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background-image: linear-gradient(180deg, rgba(6, 11, 24, 0.94), rgba(6, 11, 24, 0.72));
  background-color: rgba(6, 11, 24, 0.8);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  backdrop-filter: blur(16px) saturate(140%);
  border-bottom: 1px solid var(--s3-line);
}

.s3-header__inner {
  width: min(100% - 40px, var(--s3-max));
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: 84px;
  transition: min-height 180ms var(--s3-ease);
}

.s3-header.is-compact .s3-header__inner { min-height: 68px; }

.s3-brand {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  flex: 0 0 auto;
  color: var(--s3-text);
}

.s3-brand__mark {
  font-size: 21px;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.01em;
  transition: color 180ms var(--s3-ease);
}

.s3-brand__sub {
  font-family: var(--s3-font-mono);
  font-size: 10px;
  line-height: 1;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--s3-cyan);
}

.s3-brand:hover .s3-brand__mark { color: var(--s3-cyan); }

.s3-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
}

.s3-nav__list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.s3-nav__item { list-style: none; }

.s3-nav__link {
  position: relative;
  display: inline-block;
  padding: 8px 12px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--s3-muted);
  transition: color 180ms var(--s3-ease);
}

.s3-nav__link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 2px;
  height: 1px;
  background-color: var(--s3-cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 180ms var(--s3-ease);
}

.s3-nav__link:hover { color: var(--s3-text); }
.s3-nav__link:hover::after { transform: scaleX(1); }

.s3-nav__link[aria-current="page"] { color: var(--s3-text); }

.s3-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  box-shadow: 0 0 10px rgba(0, 229, 208, 0.7);
}

.s3-header__actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  margin-left: 16px;
}

.s3-nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--s3-line);
  border-radius: var(--s3-radius);
  background-color: transparent;
  color: var(--s3-text);
  cursor: pointer;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  position: relative;
  z-index: 80;
  transition: border-color 180ms var(--s3-ease), color 180ms var(--s3-ease);
}

.s3-nav-toggle:hover { border-color: rgba(0, 229, 208, 0.5); color: var(--s3-cyan); }

.s3-nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  width: 16px;
}

.s3-nav-toggle__bars i {
  display: block;
  width: 100%;
  height: 1px;
  background-color: currentColor;
  transition: transform 180ms var(--s3-ease), opacity 180ms var(--s3-ease);
}

.s3-nav-toggle[aria-expanded="true"] .s3-nav-toggle__bars i:nth-child(1) { transform: translateY(4px) rotate(45deg); }
.s3-nav-toggle[aria-expanded="true"] .s3-nav-toggle__bars i:nth-child(2) { opacity: 0; }
.s3-nav-toggle[aria-expanded="true"] .s3-nav-toggle__bars i:nth-child(3) { transform: translateY(-4px) rotate(-45deg); }

.s3-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  transform: scaleX(0);
  transform-origin: left center;
  background-image: linear-gradient(90deg, var(--s3-cyan), var(--s3-cyan-bright) 45%, var(--s3-orange));
  pointer-events: none;
  will-change: transform;
}

/* ---------- 12. 页脚 ---------- */
.s3-footer {
  position: relative;
  margin-top: clamp(56px, 8vw, 120px);
  border-top: 1px solid var(--s3-line);
  background-color: var(--s3-deep);
  background-image:
    radial-gradient(760px 320px at 88% 0%, rgba(255, 122, 26, 0.1), transparent 70%),
    radial-gradient(700px 380px at 4% 100%, rgba(0, 229, 208, 0.08), transparent 70%);
  background-repeat: no-repeat;
  color: var(--s3-muted);
  font-size: 14px;
}

.s3-footer__inner {
  width: min(100% - 40px, var(--s3-max));
  margin-inline: auto;
  padding-block: clamp(44px, 6vw, 76px) clamp(24px, 3vw, 36px);
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 2fr);
  gap: clamp(32px, 5vw, 72px);
}

.s3-footer__mark {
  font-size: 22px;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--s3-text);
}

.s3-footer__tagline {
  margin-top: 12px;
  max-width: 28em;
  line-height: 1.7;
}

.s3-footer__nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.s3-footer__col { min-width: 0; }

.s3-footer__col-title {
  margin-bottom: 14px;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--s3-cyan);
}

.s3-footer__list {
  display: grid;
  gap: 10px;
}

.s3-footer__list a {
  display: inline-block;
  color: var(--s3-text);
  font-size: 14px;
  border-bottom: 1px solid transparent;
  transition: color 180ms var(--s3-ease), border-color 180ms var(--s3-ease);
}

.s3-footer__list a:hover {
  color: var(--s3-cyan);
  border-bottom-color: var(--s3-cyan);
}

.s3-footer__meta {
  grid-column: 1 / -1;
  padding-top: clamp(20px, 3vw, 30px);
  border-top: 1px solid var(--s3-line);
  display: grid;
  gap: 6px;
}

.s3-footer__contact {
  color: var(--s3-text);
  font-size: 14px;
  letter-spacing: 0.02em;
}

.s3-footer__note { max-width: 56em; line-height: 1.7; }

.s3-footer__address { line-height: 1.7; }

.s3-footer__legal {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--s3-muted);
}

.s3-footer__icp { color: var(--s3-muted); }

/* ---------- 13. 视口显现（仅 JS 可用时启用初始隐藏） ---------- */
.s3-js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 220ms var(--s3-ease), transform 220ms var(--s3-ease);
}

.s3-js [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* ---------- 14. 响应式 ---------- */
@media (max-width: 1180px) and (min-width: 961px) {
  .s3-nav__list { gap: 0; }
  .s3-nav__link { padding: 8px 9px; font-size: 13px; }
  .s3-nav__link::after { left: 9px; right: 9px; }
  .s3-header__actions { margin-left: 8px; }
}

@media (max-width: 960px) {
  .s3-header__inner {
    width: min(100% - 32px, var(--s3-max));
    gap: 12px;
    min-height: 68px;
  }

  .s3-header.is-compact .s3-header__inner { min-height: 56px; }

  .s3-nav-toggle { display: inline-flex; }

  .s3-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 70;
    width: min(86vw, 340px);
    margin: 0;
    padding: 96px 26px 32px;
    flex-direction: column;
    align-items: stretch;
    overflow-y: auto;
    background-color: rgba(6, 11, 24, 0.97);
    background-image: linear-gradient(160deg, rgba(12, 23, 48, 0.98), rgba(6, 11, 24, 0.99));
    -webkit-backdrop-filter: blur(18px);
    backdrop-filter: blur(18px);
    border-left: 1px solid var(--s3-line);
    box-shadow: -24px 0 60px rgba(0, 0, 0, 0.55);
    transform: translateX(102%);
    visibility: hidden;
    transition: transform 220ms var(--s3-ease), visibility 0s linear 220ms;
  }

  .s3-nav[data-open] {
    transform: translateX(0);
    visibility: visible;
    transition: transform 220ms var(--s3-ease), visibility 0s linear 0s;
  }

  .s3-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .s3-nav__item { border-bottom: 1px solid var(--s3-line); }

  .s3-nav__link {
    display: block;
    padding: 16px 2px;
    font-size: 19px;
    font-weight: 700;
    letter-spacing: 0.02em;
    color: var(--s3-text);
  }

  .s3-nav__link::after { display: none; }
  .s3-nav__link:hover { color: var(--s3-cyan); }

  .s3-nav__link[aria-current="page"] { color: var(--s3-cyan); }

  .s3-nav__link[aria-current="page"]::before {
    content: "";
    display: inline-block;
    width: 6px;
    height: 6px;
    margin-right: 10px;
    border-radius: 50%;
    background-color: var(--s3-cyan);
    box-shadow: 0 0 10px var(--s3-cyan);
    vertical-align: middle;
  }

  .s3-header[data-open] { background-color: rgba(6, 11, 24, 0.99); }

  body.s3-nav-open { overflow: hidden; }

  .s3-btn { padding: 10px 14px; font-size: 12px; }
}

@media (max-width: 880px) {
  .s3-footer__inner { grid-template-columns: minmax(0, 1fr); }
  .s3-footer__nav { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  .s3-span-4,
  .s3-span-5,
  .s3-span-6,
  .s3-span-7,
  .s3-span-8 { grid-column: span 6; }

  .s3-grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 760px) {
  .s3-chapter { grid-template-columns: minmax(0, 1fr); }
  .s3-chapter__num { font-size: clamp(48px, 16vw, 92px); }
}

@media (max-width: 720px) {
  .s3-container { width: min(100% - 28px, var(--s3-max)); }
  .s3-footer__inner { width: min(100% - 28px, var(--s3-max)); }
}

@media (max-width: 640px) {
  .s3-span-4,
  .s3-span-5,
  .s3-span-6,
  .s3-span-7,
  .s3-span-8 { grid-column: 1 / -1; }

  .s3-grid--2,
  .s3-grid--3 { grid-template-columns: minmax(0, 1fr); }

  .s3-grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
}

@media (max-width: 540px) {
  .s3-footer__nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px 16px;
  }

  .s3-footer__legal { flex-direction: column; }
}

/* ---------- 15. 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;
    transition-delay: 0ms !important;
  }

  .s3-js [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }

  .s3-card--glass:hover { transform: none; }
}