/* ==========================================================================
   乐鱼手机赛场 · 共享样式 /assets/site.css
   基调：深海蓝底 / 荧光青（主场）/ 珊瑚橙（客场）/ 香槟金（数据与焦点）
   ========================================================================== */

/* --- 1. Reset ----------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 112px;
}
body, h1, h2, h3, h4, p, ul, ol, li, figure, blockquote, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
[hidden] { display: none !important; }

/* --- 2. 变量 ------------------------------------------------------------ */
:root {
  --c-deep: #071A2F;
  --c-panel: #0E2740;
  --c-panel-2: #0A2137;
  --c-ink: #030B16;
  --c-cyan: #35F2D6;
  --c-coral: #FF6B4A;
  --c-gold: #E8C77A;
  --c-mist: #A9C2D9;
  --c-white: #F2F7FB;
  --c-grad: #0F3A54;
  --c-grid: #5E7A93;

  --c-line: rgba(94, 122, 147, .28);
  --c-line-2: rgba(94, 122, 147, .5);
  --c-line-soft: rgba(94, 122, 147, .14);
  --c-text-soft: rgba(169, 194, 217, .78);

  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  --fs-display: clamp(40px, 6vw, 96px);
  --fs-h2: clamp(26px, 3.4vw, 46px);
  --fs-h3: clamp(18px, 1.5vw, 23px);
  --fs-body: 17px;
  --fs-small: 14px;
  --fs-micro: 12px;
  --lh-body: 1.75;
  --lh-tight: 1.08;

  --sp-1: 8px;
  --sp-2: 16px;
  --sp-3: 24px;
  --sp-4: 40px;
  --sp-5: 72px;
  --sp-6: 120px;

  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 24px;
  --r-pill: 999px;

  --shell: 1240px;
  --dur: 200ms;
  --ease: cubic-bezier(.2, .7, .3, 1);
  --z-progress: 90;
  --z-header: 80;
  --z-skip: 120;
}

/* --- 3. 中文排版基础 ---------------------------------------------------- */
body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  letter-spacing: .01em;
  color: var(--c-mist);
  background-color: var(--c-deep);
  background-image:
    radial-gradient(140% 55% at 82% 0%, rgba(15, 58, 84, .92), rgba(7, 26, 47, 0) 64%),
    radial-gradient(90% 40% at 4% 6%, rgba(53, 242, 214, .07), rgba(7, 26, 47, 0) 60%);
  background-repeat: no-repeat;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  color: var(--c-white);
  font-weight: 800;
  line-height: var(--lh-tight);
  letter-spacing: -.02em;
}

p { max-width: 74ch; }

main { display: block; }

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .01em;
}

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

/* --- 4. 布局骨架 -------------------------------------------------------- */
.container {
  width: min(100% - 32px, var(--shell));
  margin-inline: auto;
}

.section { padding-block: var(--sp-5); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--sp-3);
  margin-bottom: var(--sp-4);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--sp-3);
}
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-8 { grid-column: span 8; }
.col-12 { grid-column: span 12; }

.stack-panels {
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
}

.divider {
  height: 1px;
  border: 0;
  margin-block: var(--sp-4);
  background: linear-gradient(90deg, transparent, var(--c-line-2), transparent);
}

.rule-grid {
  position: relative;
  background-image:
    linear-gradient(var(--c-line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--c-line-soft) 1px, transparent 1px);
  background-size: 40px 40px;
}

/* --- 5. 文字层级 -------------------------------------------------------- */
.display-title {
  font-size: var(--fs-display);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.04;
  color: var(--c-white);
}

.section-title {
  font-size: var(--fs-h2);
  font-weight: 800;
  color: var(--c-white);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--c-cyan);
}
.eyebrow::before {
  content: "";
  width: 24px;
  height: 1px;
  background: currentColor;
}

.lede {
  font-size: 18px;
  line-height: 1.7;
  color: var(--c-text-soft);
  max-width: 68ch;
}

.annotation-vertical {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .3em;
  color: var(--c-mist);
}

.section-marker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .2em;
  color: var(--c-grid);
  padding: 4px 10px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-sm);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.scroll-section {
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.scroll-section[data-active] { color: var(--c-white); }
.scroll-section[data-active] .section-marker {
  color: var(--c-cyan);
  border-color: rgba(53, 242, 214, .5);
}

/* --- 6. 跳转链接 -------------------------------------------------------- */
.skip-link {
  position: fixed;
  top: -120px;
  left: 16px;
  z-index: var(--z-skip);
  padding: 12px 22px;
  border-radius: var(--r-pill);
  background: var(--c-gold);
  color: var(--c-ink);
  font-size: var(--fs-small);
  font-weight: 700;
  transition: top var(--dur) var(--ease);
}
.skip-link:focus { top: 14px; }

/* --- 7. 头部：悬浮胶囊浮岛 ---------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  padding: 12px 0 10px;
  background: linear-gradient(180deg, rgba(7, 26, 47, .97) 34%, rgba(7, 26, 47, .76) 72%, rgba(7, 26, 47, 0));
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: var(--z-progress);
  background: rgba(94, 122, 147, .18);
  pointer-events: none;
}
.scroll-progress-bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--c-cyan), var(--c-gold) 68%, var(--c-coral));
  transition: width 120ms linear;
}

.header-shell {
  position: relative;
  width: min(100% - 32px, var(--shell));
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  min-height: 60px;
  padding: 8px 10px 8px 14px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-pill);
  background: linear-gradient(120deg, rgba(14, 39, 64, .94), rgba(7, 26, 47, .86));
  box-shadow: 0 28px 44px -34px rgba(3, 11, 22, .95);
}

/* 品牌 */
.brand {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 4px 12px 4px 4px;
  border-radius: var(--r-pill);
  transition: background var(--dur) var(--ease);
}
.brand:hover { background: rgba(53, 242, 214, .07); }

.brand-mark {
  position: relative;
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  border-radius: 11px;
  background: linear-gradient(140deg, var(--c-cyan), var(--c-grad) 78%);
  box-shadow: inset 0 0 0 1px rgba(242, 247, 251, .2), 0 14px 26px -20px rgba(53, 242, 214, .95);
}
.brand-mark::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 10px;
  width: 13px;
  height: 13px;
  border-left: 1px solid rgba(3, 11, 22, .5);
  border-bottom: 1px solid rgba(3, 11, 22, .5);
}
.brand-mark::after {
  content: "";
  position: absolute;
  right: 8px;
  bottom: 8px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--c-ink);
}
.brand-mark-node {
  position: absolute;
  left: 8px;
  top: 8px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--c-ink);
}

.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name { font-size: 16px; font-weight: 800; color: var(--c-white); letter-spacing: .02em; }
.brand-sub {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--c-mist);
}

/* 主导航 */
.primary-nav {
  flex: 1 1 auto;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  height: 38px;
  padding: 0 14px;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  font-size: var(--fs-small);
  font-weight: 500;
  color: var(--c-mist);
  white-space: nowrap;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 6px;
  height: 1px;
  background: var(--c-cyan);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur) var(--ease);
}
.nav-link:hover { color: var(--c-white); }
.nav-link:hover::after { transform: scaleX(1); }
.nav-link[aria-current="page"] {
  color: var(--c-cyan);
  border-color: rgba(53, 242, 214, .45);
  background: rgba(53, 242, 214, .07);
}
.nav-link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 50%;
  width: 4px;
  height: 4px;
  margin-top: -2px;
  border-radius: 50%;
  background: var(--c-gold);
}

.nav-quick { display: none; }

.quick-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  height: 44px;
  padding: 0 14px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  font-size: var(--fs-small);
  color: var(--c-mist);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.quick-link::after {
  content: "→";
  font-family: var(--font-mono);
  color: var(--c-cyan);
}
.quick-link:hover { border-color: var(--c-cyan); color: var(--c-white); }

/* 头部右侧 */
.header-tail {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: var(--sp-1);
}

.season-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 38px;
  padding: 0 14px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-pill);
  background: rgba(3, 11, 22, .5);
  font-size: 13px;
  color: var(--c-mist);
  white-space: nowrap;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.season-pill:hover { border-color: var(--c-cyan); color: var(--c-white); }
.season-pill-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-coral);
  box-shadow: 0 0 0 4px rgba(255, 107, 74, .14);
}
.season-pill-label { letter-spacing: .04em; }
.season-pill-value { font-size: var(--fs-micro); color: var(--c-gold); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  height: 38px;
  padding: 0 14px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-pill);
  color: var(--c-white);
  font-size: var(--fs-small);
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.nav-toggle:hover { border-color: var(--c-cyan); }
.nav-toggle-bars { display: grid; gap: 5px; width: 16px; }
.nav-toggle-bars i {
  display: block;
  height: 1.5px;
  border-radius: 2px;
  background: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.nav-toggle[aria-expanded="true"] { color: var(--c-cyan); border-color: rgba(53, 242, 214, .5); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:first-child { transform: translateY(3.25px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:last-child { transform: translateY(-3.25px) rotate(-45deg); }
.nav-toggle-text { letter-spacing: .06em; }

/* 胶囊下方注释带 */
.header-tagline {
  width: min(100% - 32px, var(--shell));
  margin: 10px auto 0;
  display: flex;
  align-items: center;
  gap: 10px;
  padding-left: 20px;
  font-size: var(--fs-micro);
  letter-spacing: .08em;
  color: rgba(169, 194, 217, .72);
}
.header-tagline-mark {
  width: 18px;
  height: 1px;
  background: linear-gradient(90deg, var(--c-cyan), transparent);
}

/* --- 8. 通用按钮 -------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 46px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.btn--primary { background: var(--c-cyan); color: #04141F; }
.btn--primary:hover { background: #63F7E3; }
.btn--ghost { border-color: var(--c-line-2); color: var(--c-white); }
.btn--ghost:hover { border-color: var(--c-cyan); color: var(--c-cyan); }
.btn--quiet { padding: 0 12px; color: var(--c-mist); }
.btn--quiet:hover { color: var(--c-gold); }

/* --- 9. 面包屑 ---------------------------------------------------------- */
.breadcrumb {
  width: min(100% - 32px, var(--shell));
  margin: var(--sp-3) auto 0;
  font-size: 13px;
}
.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}
.breadcrumb-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--c-text-soft);
}
.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  font-family: var(--font-mono);
  color: var(--c-grid);
}
.breadcrumb-link {
  color: var(--c-mist);
  transition: color var(--dur) var(--ease);
}
.breadcrumb-link:hover { color: var(--c-cyan); }

/* --- 10. 面板与标签 ----------------------------------------------------- */
.panel {
  padding: var(--sp-3);
  border: 1px solid var(--c-line);
  border-radius: var(--r-lg);
  background: linear-gradient(160deg, var(--c-panel), rgba(10, 33, 55, .72));
}
.panel--stack {
  box-shadow: 0 32px 0 -30px rgba(3, 11, 22, .85), 0 0 0 1px rgba(94, 122, 147, .07);
}
.panel-title {
  font-size: var(--fs-h3);
  font-weight: 800;
  color: var(--c-white);
  margin-bottom: var(--sp-1);
}

.tag {
  display: inline-flex;
  align-items: center;
  height: 24px;
  padding: 0 10px;
  border: 1px solid var(--c-line);
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .06em;
  color: var(--c-mist);
}
.tag--round {
  color: var(--c-gold);
  border-color: rgba(232, 199, 122, .42);
}

.swatch {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .06em;
}
.swatch::before {
  content: "";
  width: 9px;
  height: 9px;
  border-radius: 2px;
  background: currentColor;
}
.swatch--home { color: var(--c-cyan); }
.swatch--away { color: var(--c-coral); }

/* --- 11. 数据块 --------------------------------------------------------- */
.data-block {
  padding-left: 14px;
  border-left: 2px solid var(--c-cyan);
}
.data-value {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(28px, 3.6vw, 48px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--c-white);
}
.data-label {
  display: block;
  margin-top: 4px;
  font-size: var(--fs-micro);
  letter-spacing: .14em;
  color: var(--c-mist);
}

/* --- 12. 时间轴 --------------------------------------------------------- */
.timeline {
  position: relative;
  padding-left: 28px;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-cyan), rgba(94, 122, 147, .35));
}
.timeline-item {
  position: relative;
  padding-bottom: var(--sp-3);
}
.timeline-item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 2px;
  background: var(--c-deep);
  border: 1px solid var(--c-grid);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.timeline-item[data-state="live"]::before {
  border-color: var(--c-cyan);
  background: var(--c-cyan);
}
.timeline-item:hover::before { border-color: var(--c-gold); }
.timeline-time {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-micro);
  letter-spacing: .14em;
  color: var(--c-gold);
  margin-bottom: 4px;
}
.timeline-text { color: var(--c-mist); font-size: 15px; }

/* --- 13. 签表树 --------------------------------------------------------- */
.bracket {
  display: flex;
  gap: var(--sp-3);
  overflow-x: auto;
  padding-bottom: var(--sp-1);
  scrollbar-width: thin;
}
.bracket-round {
  flex: 0 0 auto;
  min-width: 208px;
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  gap: var(--sp-2);
}
.bracket-round-title {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .18em;
  color: var(--c-mist);
  padding-bottom: 6px;
  border-bottom: 1px solid var(--c-line);
}
.bracket-node {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--c-line);
  border-left-width: 2px;
  border-left-color: var(--c-grid);
  border-radius: var(--r-sm);
  background: rgba(14, 39, 64, .72);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.bracket-node:hover { border-color: var(--c-cyan); background: rgba(53, 242, 214, .06); }
.bracket-node[data-side="home"] { border-left-color: var(--c-cyan); }
.bracket-node[data-side="away"] { border-left-color: var(--c-coral); }
.bracket-team { font-size: 14px; color: var(--c-white); }
.bracket-score {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  color: var(--c-gold);
}

/* --- 14. 折叠面板 ------------------------------------------------------- */
.fold {
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  background: rgba(14, 39, 64, .6);
  overflow: hidden;
  transition: border-color var(--dur) var(--ease);
}
.fold:hover { border-color: var(--c-line-2); }
.fold[data-open] { border-color: rgba(53, 242, 214, .45); }
.fold-head {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 18px;
  text-align: left;
  cursor: pointer;
  transition: color var(--dur) var(--ease);
}
.fold-title { font-size: 16px; font-weight: 700; color: var(--c-white); }
.fold-cue {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--c-grid);
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.fold[data-open] .fold-head .fold-title { color: var(--c-cyan); }
.fold[data-open] .fold-cue { color: var(--c-cyan); transform: rotate(45deg); }
.fold-body {
  padding: 0 18px 18px;
  font-size: 15px;
  color: var(--c-mist);
}

/* --- 15. 图片容器 ------------------------------------------------------- */
.media-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  display: grid;
  place-items: center;
  overflow: hidden;
  border: 1px solid var(--c-line);
  border-radius: var(--r-lg);
  background: linear-gradient(150deg, var(--c-grad), var(--c-ink));
}
.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; border-radius: var(--r-md); }
.media-frame--square { aspect-ratio: 1 / 1; border-radius: var(--r-md); }

.media-frame-placeholder {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(94, 122, 147, .16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(94, 122, 147, .16) 1px, transparent 1px);
  background-size: 32px 32px;
}
.media-frame-placeholder::after {
  content: "";
  position: absolute;
  left: 10%;
  top: 20%;
  width: 36%;
  height: 58%;
  border: 1px solid rgba(53, 242, 214, .5);
  border-radius: var(--r-sm);
  box-shadow: inset 0 0 0 1px rgba(255, 107, 74, .28);
}

.media-caption {
  margin-top: var(--sp-1);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .06em;
  color: var(--c-text-soft);
}

/* --- 16. 页脚 ----------------------------------------------------------- */
.site-footer {
  position: relative;
  margin-top: var(--sp-6);
  padding: var(--sp-6) 0 var(--sp-4);
  border-top: 1px solid var(--c-line);
  background:
    linear-gradient(180deg, rgba(3, 11, 22, 0), var(--c-ink) 20%),
    var(--c-ink);
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--c-cyan), var(--c-coral), transparent);
  opacity: .5;
}

.footer-shell {
  position: relative;
  width: min(100% - 32px, var(--shell));
  margin-inline: auto;
  display: grid;
  grid-template-columns: 1.7fr 1fr 1fr 1.4fr;
  gap: var(--sp-4);
}

.footer-brand { display: flex; flex-direction: column; align-items: flex-start; }

.footer-mark {
  position: relative;
  width: 48px;
  height: 48px;
  border-radius: var(--r-md);
  background: linear-gradient(140deg, var(--c-cyan), var(--c-grad) 80%);
  box-shadow: inset 0 0 0 1px rgba(242, 247, 251, .18);
  margin-bottom: var(--sp-2);
}
.footer-mark::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 13px;
  width: 20px;
  height: 20px;
  border-left: 1px solid rgba(3, 11, 22, .5);
  border-bottom: 1px solid rgba(3, 11, 22, .5);
}
.footer-mark::after {
  content: "";
  position: absolute;
  right: 11px;
  bottom: 11px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-ink);
}
.footer-mark-node {
  position: absolute;
  left: 11px;
  top: 11px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-ink);
}

.footer-name {
  font-size: 22px;
  font-weight: 800;
  color: var(--c-white);
  letter-spacing: -.01em;
}
.footer-sub {
  margin-top: 4px;
  font-size: var(--fs-micro);
  letter-spacing: .2em;
  color: var(--c-gold);
}
.footer-lede {
  margin-top: var(--sp-2);
  max-width: 34ch;
  font-size: 15px;
  color: var(--c-text-soft);
}

.to-top {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: var(--sp-3);
  height: 40px;
  padding: 0 16px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-pill);
  font-size: 13px;
  color: var(--c-mist);
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.to-top:hover { border-color: var(--c-gold); color: var(--c-gold); }

.footer-col { min-width: 0; }
.footer-col-title {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  font-weight: 500;
  letter-spacing: .24em;
  color: var(--c-grid);
  padding-bottom: 10px;
  margin-bottom: var(--sp-2);
  border-bottom: 1px solid var(--c-line);
}
.footer-links { display: flex; flex-direction: column; gap: 6px; }
.footer-link {
  position: relative;
  display: inline-block;
  padding: 3px 0;
  font-size: 15px;
  color: var(--c-mist);
  transition: color var(--dur) var(--ease);
}
.footer-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--c-cyan);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur) var(--ease);
}
.footer-link:hover { color: var(--c-white); }
.footer-link:hover::after { transform: scaleX(1); }

.footer-contact-list { display: flex; flex-direction: column; gap: var(--sp-2); }
.footer-contact-item { display: flex; flex-direction: column; gap: 2px; }
.footer-contact-key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--c-grid);
}
.footer-contact-value {
  font-size: 14px;
  color: var(--c-white);
  word-break: break-word;
}
.footer-contact-note {
  font-size: 12px;
  line-height: 1.7;
  color: var(--c-text-soft);
  padding-top: var(--sp-1);
  border-top: 1px dashed var(--c-line);
}

.footer-meta {
  width: min(100% - 32px, var(--shell));
  margin: var(--sp-4) auto 0;
  padding-top: var(--sp-3);
  border-top: 1px solid var(--c-line);
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--sp-2);
}
.footer-statement {
  max-width: 62ch;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-text-soft);
}
.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-micro);
  color: var(--c-mist);
}
.footer-dot { color: var(--c-grid); }

/* --- 17. 响应式 --------------------------------------------------------- */
@media (max-width: 1080px) {
  .footer-shell { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: span 2; }
}

@media (max-width: 960px) {
  :root { --sp-5: 56px; --sp-6: 80px; }

  .primary-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: calc(100% + 10px);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: var(--sp-2);
    padding: var(--sp-2);
    border: 1px solid var(--c-line);
    border-radius: var(--r-lg);
    background: linear-gradient(160deg, rgba(14, 39, 64, .99), rgba(3, 11, 22, .99));
    box-shadow: 0 34px 50px -34px rgba(3, 11, 22, .95);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility var(--dur) var(--ease);
  }
  .primary-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .nav-list { flex-direction: column; align-items: stretch; gap: 4px; }
  .nav-link {
    width: 100%;
    height: 46px;
    justify-content: flex-start;
    padding: 0 14px;
    border-radius: var(--r-md);
    font-size: 15px;
  }
  .nav-link::after { display: none; }
  .nav-link[aria-current="page"]::before { left: 4px; }

  .nav-quick { display: grid; gap: var(--sp-1); }

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

  .header-tagline { display: none; }

  .col-3, .col-4, .col-5, .col-6, .col-8 { grid-column: span 12; }
}

@media (max-width: 720px) {
  body { font-size: 16px; }
  .grid-12 { gap: var(--sp-2); }
  .footer-shell { grid-template-columns: 1fr; gap: var(--sp-3); }
  .footer-brand { grid-column: span 1; }
  .section-head { align-items: flex-start; }
}

@media (max-width: 520px) {
  .brand-sub { display: none; }
  .season-pill { display: none; }
  .header-shell { padding: 6px 8px 6px 10px; }
  .bracket-round { min-width: 168px; }
  .media-frame--wide { aspect-ratio: 16 / 9; }
}

/* --- 18. 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;
    scroll-behavior: auto !important;
  }
  .scroll-progress-bar { transition: none; }
}