/* ==========================================================================
   B体育看台 · /assets/site.css
   共享外壳：重置 / 变量 / 中文排版 / 头部 / 页脚 / 基础组件
   页面专属布局请写在页面 CSS 中，不要覆盖本文件的外壳规则
   ========================================================================== */

/* ---------- 01. 变量 ---------- */
:root {
  --ink: #071426;
  --ink-2: #0e2138;
  --paper: #f4ebdd;
  --ink-text: #101820;
  --lime: #a3ff3c;
  --orange: #ff7a1a;
  --cyan: #46d9ff;
  --mist: #8fa3b8;
  --line: #233b55;
  --red: #ff5d5d;

  --font-display: "Archivo Black", "Oswald", "Impact", "Haettenschweiler",
    "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "SimSun",
    Georgia, serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", system-ui, -apple-system,
    "Segoe UI", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", "Roboto Mono", "Noto Sans Mono", ui-monospace,
    SFMono-Regular, Menlo, Consolas, monospace;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --maxw: 1180px;
  --skew: -6deg;
  --radius: 18px;
  --shadow-soft: 0 26px 60px -38px rgba(0, 0, 0, 0.92);
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 110px;
}

body {
  margin: 0;
  background-color: var(--ink);
  background-image:
    linear-gradient(rgba(70, 217, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(70, 217, 255, 0.045) 1px, transparent 1px);
  background-size: 88px 88px;
  background-attachment: fixed;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  color: var(--cyan);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
  text-underline-offset: 0.25em;
}

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
}

hr,
.divider {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 0;
}

.divider {
  margin-block: clamp(28px, 4vw, 52px);
}

::selection {
  background: var(--lime);
  color: #071426;
}

:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
  border-radius: 6px;
}

main {
  display: block;
}

/* ---------- 03. 排版 ---------- */
h1,
h2,
h3,
h4,
h5 {
  margin: 0 0 0.45em;
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.015em;
  color: inherit;
}

h1 {
  font-size: clamp(34px, 6vw, 64px);
}

h2 {
  font-size: clamp(26px, 3.8vw, 42px);
}

h3 {
  font-size: clamp(19px, 2.2vw, 25px);
}

h4 {
  font-size: 17px;
  letter-spacing: 0;
  line-height: 1.35;
}

p {
  margin: 0 0 1.05em;
}

p:last-child {
  margin-bottom: 0;
}

strong,
b {
  font-weight: 700;
}

small {
  font-size: 13px;
}

.title-serif {
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: 0.01em;
  line-height: 1.2;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.7em;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--lime);
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: currentColor;
  opacity: 0.75;
}

.lede {
  max-width: 32em;
  font-family: var(--font-serif);
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.72;
  color: inherit;
}

.prose {
  max-width: 34em;
}

.prose p {
  margin-bottom: 1.15em;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- 04. 布局容器与网格 ---------- */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 40px);
}

.wrap-narrow {
  width: 100%;
  max-width: 820px;
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 40px);
}

.section {
  padding-block: clamp(48px, 8vw, 104px);
}

.grid {
  display: grid;
  gap: clamp(18px, 2.6vw, 34px);
}

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

.col-12 { grid-column: span 12; }
.col-9  { grid-column: span 9; }
.col-8  { grid-column: span 8; }
.col-7  { grid-column: span 7; }
.col-6  { grid-column: span 6; }
.col-5  { grid-column: span 5; }
.col-4  { grid-column: span 4; }
.col-3  { grid-column: span 3; }

@media (max-width: 900px) {
  .col-9,
  .col-8,
  .col-7,
  .col-6,
  .col-5 {
    grid-column: span 12;
  }
  .col-4,
  .col-3 {
    grid-column: span 6;
  }
}

@media (max-width: 620px) {
  .col-4,
  .col-3 {
    grid-column: span 12;
  }
}

/* ---------- 05. 表面区块 ---------- */
.surface-paper {
  position: relative;
  background: var(--paper);
  color: var(--ink-text);
  border-radius: clamp(20px, 3vw, 34px);
  padding: clamp(28px, 5vw, 68px);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

.surface-paper::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(rgba(16, 24, 32, 0.14) 1px, transparent 1px);
  background-size: 22px 22px;
  opacity: 0.28;
  mix-blend-mode: multiply;
}

.surface-paper > * {
  position: relative;
}

.surface-paper a {
  color: #0a567d;
}

.surface-paper hr,
.surface-paper .divider {
  border-color: rgba(16, 24, 32, 0.16);
}

.surface-paper .eyebrow {
  color: #1f6b2f;
}

.surface-paper .stat-cap,
.surface-paper .figure-cap {
  color: rgba(16, 24, 32, 0.62);
}

.surface-paper .stat-num {
  color: #14507a;
}

.surface-ink {
  background: linear-gradient(168deg, var(--ink-2) 0%, var(--ink) 78%);
  border: 1px solid var(--line);
  border-radius: clamp(18px, 2.6vw, 28px);
  padding: clamp(24px, 4vw, 52px);
}

/* ---------- 06. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  padding: 13px 24px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.01em;
  text-decoration: none;
  cursor: pointer;
  transition:
    transform 0.22s var(--ease),
    background-color 0.22s var(--ease),
    border-color 0.22s var(--ease),
    color 0.22s var(--ease),
    box-shadow 0.22s var(--ease);
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-2px);
}

.btn-primary {
  background: var(--orange);
  color: #180b00;
  box-shadow: 0 18px 36px -22px rgba(255, 122, 26, 0.95);
}

.btn-primary:hover {
  background: #ff8c3d;
}

.btn-lime {
  background: var(--lime);
  color: #071426;
  box-shadow: 0 18px 36px -24px rgba(163, 255, 60, 0.9);
}

.btn-lime:hover {
  background: #b6ff66;
}

.btn-ghost {
  border-color: var(--line);
  background: rgba(70, 217, 255, 0.06);
  color: var(--paper);
}

.btn-ghost:hover {
  border-color: var(--cyan);
  color: #ffffff;
}

.surface-paper .btn-ghost {
  border-color: rgba(16, 24, 32, 0.24);
  background: rgba(16, 24, 32, 0.04);
  color: var(--ink-text);
}

.surface-paper .btn-ghost:hover {
  border-color: #101820;
  color: #101820;
}

.btn-link {
  padding: 0;
  border-radius: 0;
  background: none;
  color: var(--cyan);
  font-weight: 600;
}

.btn-link::after {
  content: "→";
  transition: transform 0.22s var(--ease);
}

.btn-link:hover::after {
  transform: translateX(4px);
}

/* ---------- 07. 面包屑 ---------- */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55em;
  margin: 0 0 clamp(20px, 3vw, 34px);
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.crumbs li {
  display: inline-flex;
  align-items: center;
  gap: 0.55em;
}

.crumbs li + li::before {
  content: "/";
  color: var(--line);
}

.crumbs a {
  color: var(--mist);
}

.crumbs a:hover {
  color: var(--cyan);
  text-decoration: none;
}

.crumbs [aria-current="page"] {
  color: var(--paper);
}

.surface-paper .crumbs,
.surface-paper .crumbs a {
  color: rgba(16, 24, 32, 0.6);
}

.surface-paper .crumbs [aria-current="page"] {
  color: var(--ink-text);
}

/* ---------- 08. 标签 / 数字 / 面板 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.45em;
  padding: 3px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mist);
  white-space: nowrap;
}

.tag-lime {
  border-color: rgba(163, 255, 60, 0.45);
  background: rgba(163, 255, 60, 0.1);
  color: var(--lime);
}

.tag-orange {
  border-color: rgba(255, 122, 26, 0.5);
  background: rgba(255, 122, 26, 0.12);
  color: #ffa köp;
  color: #ffa45c;
}

.tag-cyan {
  border-color: rgba(70, 217, 255, 0.45);
  background: rgba(70, 217, 255, 0.1);
  color: var(--cyan);
}

.tag-red {
  border-color: rgba(255, 93, 93, 0.45);
  background: rgba(255, 93, 93, 0.1);
  color: var(--red);
}

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(14, 33, 56, 0.78), rgba(7, 20, 38, 0.78));
  padding: clamp(18px, 2.6vw, 30px);
  box-shadow: var(--shadow-soft);
}

.surface-paper .panel {
  border-color: rgba(16, 24, 32, 0.14);
  background: rgba(255, 255, 255, 0.52);
  box-shadow: none;
}

.stat {
  display: grid;
  gap: 2px;
}

.stat-num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--lime);
}

.stat-cap {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mist);
}

/* ---------- 09. 折叠面板 ---------- */
.acc {
  border-top: 1px solid var(--line);
}

.acc-item {
  border-bottom: 1px solid var(--line);
}

.acc-item > summary {
  position: relative;
  display: block;
  padding: 17px 34px 17px 0;
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  color: inherit;
  transition: color 0.2s var(--ease);
}

.acc-item > summary::-webkit-details-marker {
  display: none;
}

.acc-item > summary::after {
  content: "+";
  position: absolute;
  right: 2px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--lime);
  transition: transform 0.22s var(--ease);
}

.acc-item[open] > summary::after {
  transform: translateY(-50%) rotate(45deg);
}

.acc-item > summary:hover {
  color: var(--lime);
}

.surface-paper .acc,
.surface-paper .acc-item {
  border-color: rgba(16, 24, 32, 0.16);
}

.surface-paper .acc-item > summary::after {
  color: #1f6b2f;
}

.surface-paper .acc-item > summary:hover {
  color: #1f6b2f;
}

.acc-body {
  padding: 0 0 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 34em;
}

.surface-paper .acc-body {
  color: rgba(16, 24, 32, 0.72);
}

/* ---------- 10. 图片容器 ---------- */
.figure {
  margin: 0;
}

.figure-media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: clamp(14px, 2vw, 22px);
  background:
    radial-gradient(120% 90% at 20% 0%, rgba(70, 217, 255, 0.18), transparent 62%),
    linear-gradient(158deg, #0e2138 0%, #071426 58%, #12263d 100%);
  aspect-ratio: 16 / 9;
}

.figure-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.figure-media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, transparent 46%, rgba(7, 20, 38, 0.7) 100%);
}

.figure-media[data-placeholder]::before {
  content: attr(data-placeholder);
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 16px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(143, 163, 184, 0.62);
}

.figure-cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.figure-tall .figure-media {
  aspect-ratio: 3 / 4;
}

.figure-wide .figure-media {
  aspect-ratio: 21 / 9;
}

@media (max-width: 640px) {
  .figure-tall .figure-media {
    aspect-ratio: 4 / 5;
  }
  .figure-wide .figure-media {
    aspect-ratio: 16 / 9;
  }
}

/* ---------- 11. 头部 ---------- */
.site-head {
  position: sticky;
  top: 0;
  z-index: 80;
  padding: 16px clamp(12px, 3vw, 30px) 0;
}

.skip-link {
  position: fixed;
  top: 0;
  left: 50%;
  z-index: 999;
  display: inline-flex;
  align-items: center;
  padding: 10px 22px;
  border-radius: 0 0 14px 14px;
  background: var(--lime);
  color: #071426;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  transform: translate(-50%, -160%);
  transition: transform 0.22s var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translate(-50%, 0);
  text-decoration: none;
  outline: none;
}

.head-shell {
  position: relative;
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.8vw, 24px);
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: 10px 12px 10px 14px;
  border: 1px solid rgba(163, 255, 60, 0.16);
  border-radius: 999px;
  background: rgba(7, 20, 38, 0.78);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  box-shadow:
    0 18px 40px -26px rgba(0, 0, 0, 0.95),
    inset 0 1px 0 rgba(244, 235, 221, 0.06);
  transition:
    padding 0.28s var(--ease),
    background-color 0.28s var(--ease),
    border-color 0.28s var(--ease);
}

.site-head[data-collapsed] .head-shell {
  padding: 6px 10px 6px 12px;
  background: rgba(7, 20, 38, 0.95);
  border-color: rgba(163, 255, 60, 0.26);
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  text-decoration: none;
  color: var(--paper);
}

.brand-mark:hover {
  text-decoration: none;
}

.brand-chip {
  position: relative;
  display: grid;
  place-items: center;
  width: 38px;
  height: 34px;
  isolation: isolate;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 900;
  line-height: 1;
  color: #071426;
}

.brand-chip::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  border-radius: 9px;
  background: linear-gradient(150deg, var(--lime) 0%, var(--cyan) 100%);
  transform: skewX(-8deg);
  box-shadow: 0 8px 18px -12px rgba(163, 255, 60, 0.95);
}

.brand-text {
  display: grid;
  gap: 1px;
  min-width: 0;
}

.brand-name {
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.2;
  color: var(--paper);
  white-space: nowrap;
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  line-height: 1.3;
  color: var(--mist);
  white-space: nowrap;
  transition: opacity 0.22s var(--ease);
}

.site-head[data-collapsed] .brand-sub {
  display: none;
}

.head-now {
  display: none;
  align-items: center;
  gap: 6px;
  padding-left: 14px;
  border-left: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  line-height: 1.4;
  color: var(--lime);
  white-space: nowrap;
}

.site-head[data-collapsed] .head-now {
  display: inline-flex;
}

.site-nav {
  margin-left: auto;
  min-width: 0;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list a {
  display: block;
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 13.5px;
  font-weight: 500;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  transition:
    color 0.2s var(--ease),
    background-color 0.2s var(--ease),
    transform 0.2s var(--ease);
}

.nav-list a:hover {
  color: var(--paper);
  background: rgba(70, 217, 255, 0.1);
  transform: translateY(-1px);
  text-decoration: none;
}

.nav-list a[aria-current="page"] {
  background: var(--lime);
  color: #071426;
  font-weight: 700;
}

.nav-list a[aria-current="page"]:hover {
  background: var(--lime);
  color: #071426;
  transform: none;
}

.head-cta {
  flex: 0 0 auto;
  padding: 9px 16px;
  border-radius: 999px;
  background: var(--orange);
  color: #180b00;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.01em;
  text-decoration: none;
  white-space: nowrap;
  box-shadow: 0 10px 22px -14px rgba(255, 122, 26, 1);
  transition:
    transform 0.22s var(--ease),
    background-color 0.22s var(--ease);
}

.head-cta:hover {
  background: #ff8c3d;
  color: #180b00;
  text-decoration: none;
  transform: translateY(-1px);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  padding: 9px 15px 9px 13px;
  border: 1px solid rgba(163, 255, 60, 0.4);
  border-radius: 999px;
  background: rgba(163, 255, 60, 0.08);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  cursor: pointer;
  transition:
    background-color 0.2s var(--ease),
    border-color 0.2s var(--ease);
}

.nav-toggle:hover {
  background: rgba(163, 255, 60, 0.16);
  border-color: var(--lime);
}

.nav-toggle-bars {
  display: inline-grid;
  gap: 3px;
  width: 16px;
}

.nav-toggle-bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--lime);
  transition:
    transform 0.22s var(--ease),
    opacity 0.22s var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

.nav-toggle-text {
  line-height: 1;
}

.head-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 90;
  height: 3px;
  pointer-events: none;
  background: rgba(35, 59, 85, 0.5);
}

.head-progress-fill {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--lime) 0%, var(--cyan) 55%, var(--orange) 100%);
  transition: width 0.12s linear;
}

/* ---------- 12. 头部移动端 ---------- */
@media (max-width: 980px) {
  .head-cta {
    display: none;
  }

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

  .head-shell {
    padding: 9px 10px 9px 12px;
  }

  .site-head[data-collapsed] .head-shell {
    padding: 7px 9px 7px 11px;
  }

  .site-nav {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    display: none;
    margin: 0;
    padding: 10px;
    border: 1px solid rgba(163, 255, 60, 0.2);
    border-radius: 22px;
    background: rgba(10, 26, 46, 0.98);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: 0 30px 60px -30px rgba(0, 0, 0, 0.96);
  }

  .site-nav[data-open] {
    display: block;
    animation: navDrop 0.26s var(--ease) both;
  }

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

  .nav-list a {
    padding: 12px 15px;
    border-radius: 14px;
    font-size: 15px;
  }

  .site-head[data-collapsed] .head-now {
    display: none;
  }
}

@keyframes navDrop {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- 13. 页脚 ---------- */
.site-foot {
  position: relative;
  margin-top: clamp(60px, 9vw, 120px);
  background: linear-gradient(180deg, #071426 0%, #05101f 100%);
  border-top: 1px solid var(--line);
  overflow: hidden;
}

.site-foot::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--lime) 0%, var(--cyan) 46%, var(--orange) 100%);
  opacity: 0.9;
}

.foot-shell {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) repeat(3, minmax(0, 1fr));
  gap: clamp(26px, 4vw, 52px);
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: clamp(40px, 6vw, 76px) clamp(16px, 4vw, 40px) clamp(24px, 3.4vw, 40px);
}

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

.foot-line {
  max-width: 26em;
  margin: 18px 0 12px;
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 235, 221, 0.78);
}

.foot-meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  line-height: 1.7;
  color: var(--mist);
}

.foot-nav,
.foot-contact {
  min-width: 0;
}

.foot-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--lime);
}

.foot-list {
  display: grid;
  gap: 9px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.foot-list li {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--mist);
  overflow-wrap: break-word;
}

.foot-list a {
  display: inline-block;
  color: var(--mist);
  text-decoration: none;
  transition:
    color 0.2s var(--ease),
    transform 0.2s var(--ease);
}

.foot-list a:hover {
  color: var(--paper);
  text-decoration: none;
  transform: translateX(3px);
}

.foot-label {
  display: block;
  margin-bottom: 1px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #5b7597;
}

.foot-list .num {
  color: var(--paper);
}

.foot-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 18px;
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: 18px clamp(16px, 4vw, 40px) 28px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--mist);
}

.dot {
  color: var(--line);
}

.to-top {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  padding: 7px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  cursor: pointer;
  transition:
    border-color 0.2s var(--ease),
    color 0.2s var(--ease),
    transform 0.2s var(--ease);
}

.to-top:hover {
  border-color: var(--lime);
  color: var(--lime);
  transform: translateY(-2px);
}

@media (max-width: 900px) {
  .foot-shell {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .foot-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 560px) {
  .foot-shell {
    grid-template-columns: 1fr;
  }
  .foot-base {
    font-size: 11px;
  }
  .to-top {
    margin-left: 0;
  }
}

/* ---------- 14. 动效降级 ---------- */
@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;
    scroll-behavior: auto !important;
  }

  .head-progress-fill {
    transition: none;
  }

  .btn:hover,
  .head-cta:hover,
  .nav-list a:hover,
  .foot-list a:hover,
  .to-top:hover {
    transform: none;
  }
}