/* ============================================================
   LM体育·CN官网 — /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 页头 / 页脚 / 通用组件
   ============================================================ */

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

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

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

ul, ol { padding: 0; }

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

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

button { background: none; border: 0; }

a { color: inherit; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

/* ---------- 2. design tokens ---------- */
:root {
  /* 色彩 */
  --ink: #06120F;
  --panel: #0B1E19;
  --ridge: #14403A;
  --cyan: #34F5C5;
  --cyan-soft: #8FF3E0;
  --amber: #FFB020;
  --violet: #9C8CFF;
  --chalk: #EAF6F1;
  --ash: #8FA9A2;
  --glass: rgba(15, 42, 36, 0.92);
  --ink-deep: #04211A;

  /* 字体 */
  --font-display: "Barlow Condensed", "Archivo Narrow", "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: Inter, "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-data: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", "Courier New", monospace;

  /* 字号 */
  --fs-display: clamp(2.6rem, 7vw, 5.4rem);
  --fs-h2: clamp(1.5rem, 2.4vw, 2.2rem);
  --fs-h3: clamp(1.15rem, 1.5vw, 1.4rem);
  --fs-body: clamp(1rem, 0.6vw + 0.85rem, 1.0625rem);
  --fs-small: 0.875rem;
  --fs-data: 0.95rem;

  /* 形状与节奏 */
  --r-xl: 28px;
  --r-lg: 22px;
  --r-md: 16px;
  --r-sm: 12px;
  --r-pill: 999px;

  --header-h: 68px;
  --header-offset: 92px;
  --gutter: clamp(16px, 4vw, 40px);
  --shell: 1240px;
  --shell-wide: 1440px;

  --shadow-soft: 0 18px 44px rgba(0, 0, 0, 0.45);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

@media (max-width: 900px) {
  :root {
    --header-h: 56px;
    --header-offset: 72px;
  }
}

/* ---------- 3. 基础排版 ---------- */
body {
  background-color: var(--ink);
  color: var(--chalk);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.005em;
  min-height: 100vh;
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

/* 夜间球场灯光：极低透明度的分区光晕，撑起整体色彩节奏 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(58vw 38vw at 10% -10%, rgba(52, 245, 197, 0.10), transparent 62%),
    radial-gradient(46vw 32vw at 94% 2%, rgba(156, 140, 255, 0.075), transparent 66%),
    radial-gradient(72vw 46vw at 50% 112%, rgba(255, 176, 32, 0.055), transparent 70%);
}

main {
  position: relative;
  z-index: 1;
  padding-top: var(--header-offset);
}

main[data-hero="overlay"] { padding-top: 0; }

#main-content:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 6px;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.16;
  text-wrap: balance;
}

p { text-wrap: pretty; }

::selection {
  background: var(--cyan);
  color: var(--ink-deep);
}

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

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 10px 20px;
  border-radius: var(--r-pill);
  background: var(--cyan);
  color: var(--ink-deep);
  font-weight: 700;
  text-decoration: none;
  transform: translateY(-180%);
  transition: transform 0.2s var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
}

/* ---------- 4. 容器与段落节奏 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.shell--wide { max-width: var(--shell-wide); }

.section {
  position: relative;
  padding-block: clamp(44px, 6.5vw, 92px);
}

.section--tight { padding-block: clamp(26px, 3.6vw, 52px); }

.section--panel {
  background: linear-gradient(180deg, rgba(11, 30, 25, 0.78), rgba(11, 30, 25, 0.24));
  border-block: 1px solid var(--ridge);
}

.section-head {
  display: grid;
  gap: 14px;
  max-width: 70ch;
  margin-bottom: clamp(20px, 3vw, 38px);
}

.section-title {
  font-size: var(--fs-h2);
  margin: 0;
}

.section-lead {
  color: var(--ash);
  max-width: 34em;
  margin: 0;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 2px;
  border-radius: 2px;
  background: var(--cyan);
  box-shadow: 0 0 10px rgba(52, 245, 197, 0.7);
}

.display-1 {
  font-family: var(--font-display);
  font-size: var(--fs-display);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 0.98;
  margin: 0;
}

.divider {
  height: 1px;
  border: 0;
  margin: clamp(24px, 4vw, 48px) 0;
  background: linear-gradient(90deg, var(--ridge), rgba(20, 64, 58, 0));
}

/* ---------- 5. 按钮 / 胶囊 / 标签 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: transform 0.18s var(--ease), background-color 0.2s, border-color 0.2s, color 0.2s;
}

.btn-primary {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink-deep);
}

.btn-primary:hover {
  background: var(--cyan-soft);
  transform: translateY(-2px);
}

.btn-ghost {
  background: rgba(52, 245, 197, 0.08);
  border-color: var(--ridge);
  color: var(--cyan);
}

.btn-ghost:hover {
  background: rgba(52, 245, 197, 0.14);
  border-color: var(--cyan);
  color: var(--chalk);
  transform: translateY(-2px);
}

.btn-quiet {
  background: transparent;
  border-color: var(--ridge);
  color: var(--ash);
}

.btn-quiet:hover {
  border-color: var(--cyan);
  color: var(--chalk);
  transform: translateY(-2px);
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border: 1px solid var(--ridge);
  border-radius: var(--r-pill);
  background: rgba(20, 64, 58, 0.32);
  color: var(--chalk);
  font-family: var(--font-data);
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  text-decoration: none;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s, background-color 0.2s;
}

.chip:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(52, 245, 197, 0.1);
}

.chip[aria-pressed="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink-deep);
  font-weight: 700;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  border: 1px solid rgba(156, 140, 255, 0.35);
  border-radius: var(--r-pill);
  background: rgba(156, 140, 255, 0.14);
  color: var(--violet);
  font-family: var(--font-data);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.tag--cyan {
  border-color: rgba(52, 245, 197, 0.35);
  background: rgba(52, 245, 197, 0.12);
  color: var(--cyan);
}

.tag--amber {
  border-color: rgba(255, 176, 32, 0.35);
  background: rgba(255, 176, 32, 0.12);
  color: var(--amber);
}

.link-more {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--cyan);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
}

.link-more::after {
  content: "→";
  transition: transform 0.2s var(--ease);
}

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

/* ---------- 6. Bento / 卡片 / 栅格 ---------- */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(14px, 1.8vw, 22px);
}

.auto-grid {
  display: grid;
  gap: clamp(14px, 2vw, 22px);
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.grid-2 {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

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

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(18px, 2.2vw, 26px);
  border: 1px solid var(--ridge);
  border-radius: var(--r-lg);
  background: var(--panel);
  transition: border-color 0.24s var(--ease), transform 0.24s var(--ease), background-color 0.24s;
}

.card:hover {
  border-color: var(--cyan);
  background: #0D231D;
  transform: translateY(-2px);
}

.card--focus {
  border-color: rgba(52, 245, 197, 0.42);
  background: linear-gradient(160deg, rgba(52, 245, 197, 0.1), rgba(11, 30, 25, 0.92) 62%);
}

.card--amber { border-color: rgba(255, 176, 32, 0.38); }
.card--violet { border-color: rgba(156, 140, 255, 0.38); }

.card-title {
  font-size: var(--fs-h3);
  font-weight: 800;
  margin: 0;
}

.card-text {
  color: var(--ash);
  font-size: 0.95rem;
  margin: 0;
}

.card-meta {
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ash);
  margin: 0;
}

/* ---------- 7. 数据轨道 / 指标 / 表格 ---------- */
.layout-split {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: clamp(18px, 2.6vw, 34px);
  align-items: start;
}

.layout-split__rail {
  position: sticky;
  top: calc(var(--header-h) + 28px);
}

.data-rail {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 18px;
  border: 1px solid var(--ridge);
  border-radius: var(--r-lg);
  background: rgba(11, 30, 25, 0.72);
  font-family: var(--font-data);
  font-size: 0.8rem;
  color: var(--ash);
}

.data-rail-title {
  font-family: var(--font-data);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.rail-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(20, 64, 58, 0.7);
  color: var(--ash);
}

.rail-item:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.rail-item strong {
  color: var(--chalk);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.stat-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
}

.stat {
  padding: 14px 16px;
  border: 1px solid var(--ridge);
  border-radius: var(--r-md);
  background: rgba(6, 18, 15, 0.6);
}

.stat-value {
  display: block;
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.4rem, 2.4vw, 1.9rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--amber);
}

.stat-label {
  display: block;
  margin-top: 6px;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--ash);
}

.stat-unit {
  margin-left: 2px;
  font-size: 0.68em;
  color: var(--cyan-soft);
}

.table-scroll {
  overflow-x: auto;
  border: 1px solid var(--ridge);
  border-radius: var(--r-md);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-data);
  font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
}

.data-table caption {
  padding: 12px 14px;
  text-align: left;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--ash);
  text-transform: uppercase;
}

.data-table th,
.data-table td {
  padding: 11px 14px;
  text-align: left;
  border-bottom: 1px solid var(--ridge);
  white-space: nowrap;
}

.data-table thead th {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cyan);
  background: rgba(11, 30, 25, 0.72);
}

.data-table tbody tr:nth-child(odd) { background: rgba(20, 64, 58, 0.18); }
.data-table tbody tr:hover { background: rgba(52, 245, 197, 0.08); }
.data-table tbody tr:last-child td { border-bottom: 0; }

.data-table .is-key {
  color: var(--amber);
  font-weight: 700;
}

/* ---------- 8. 正文 / 提示 ---------- */
.prose {
  max-width: 38em;
  color: #D6E7E1;
  font-size: var(--fs-body);
}

.prose > * + * { margin-top: 1.05em; }
.prose h2 { font-size: var(--fs-h2); margin-top: 1.6em; }
.prose h3 { font-size: var(--fs-h3); margin-top: 1.4em; }
.prose ul, .prose ol { padding-left: 1.25em; }
.prose li + li { margin-top: 0.45em; }

.prose a {
  color: var(--cyan);
  text-underline-offset: 3px;
}

.prose strong { color: var(--chalk); }

.prose blockquote {
  padding: 14px 18px;
  border-left: 3px solid var(--cyan);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: rgba(52, 245, 197, 0.07);
  color: var(--chalk);
}

.callout {
  padding: 18px 20px;
  border: 1px solid var(--ridge);
  border-left: 3px solid var(--cyan);
  border-radius: var(--r-md);
  background: rgba(11, 30, 25, 0.7);
  color: #D6E7E1;
  font-size: 0.95rem;
}

.callout--amber { border-left-color: var(--amber); }

.breadcrumb { margin-bottom: 18px; }

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  font-family: var(--font-data);
  font-size: 0.78rem;
  color: var(--ash);
}

.breadcrumb-link {
  color: var(--ash);
  text-decoration: none;
  transition: color 0.2s;
}

.breadcrumb-link:hover { color: var(--cyan); }
.breadcrumb [aria-current="page"] { color: var(--chalk); }

/* ---------- 9. 图片容器（页面阶段放图 / 占位） ---------- */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid var(--ridge);
  border-radius: var(--r-lg);
  background:
    linear-gradient(135deg, rgba(52, 245, 197, 0.14), rgba(6, 18, 15, 0.92) 62%),
    var(--panel);
}

.media-frame img,
.media-frame video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(6, 18, 15, 0) 46%, rgba(6, 18, 15, 0.74) 100%);
}

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

.media-frame--cut::before {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 42%;
  z-index: 1;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(11, 30, 25, 0), rgba(11, 30, 25, 0.92));
  clip-path: polygon(0 30%, 100% 0, 100% 100%, 0 100%);
}

.media-placeholder {
  display: grid;
  place-items: center;
  height: 100%;
  padding: 20px;
  font-family: var(--font-data);
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ash);
  text-align: center;
}

.media-caption {
  margin-top: 10px;
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--ash);
}

/* ---------- 10. 页头 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 60;
  padding-block: 18px;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color 0.28s var(--ease), padding 0.28s var(--ease), border-color 0.28s var(--ease);
}

.site-header[data-header-state="solid"] {
  padding-block: 8px;
  background: rgba(11, 30, 25, 0.96);
  border-bottom-color: var(--ridge);
}

.header-shell {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 26px);
  min-height: var(--header-h);
}

.header-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan), var(--amber));
  box-shadow: 0 0 12px rgba(52, 245, 197, 0.6);
  transition: transform 0.1s linear;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  padding: 6px 4px;
  border-radius: var(--r-pill);
  color: var(--chalk);
  text-decoration: none;
}

.brand-mark {
  position: relative;
  flex: none;
  width: 34px;
  height: 34px;
  overflow: hidden;
  border: 1px solid var(--ridge);
  border-radius: 11px;
  background: linear-gradient(150deg, rgba(52, 245, 197, 0.22), rgba(52, 245, 197, 0.04));
}

.brand-mark::before {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(52, 245, 197, 0.55);
  border-radius: 50%;
}

.brand-mark::after {
  content: "";
  position: absolute;
  left: -3px;
  bottom: 9px;
  width: calc(100% + 6px);
  height: 2px;
  background: var(--cyan);
  box-shadow: 0 0 12px rgba(52, 245, 197, 0.8);
  transform: rotate(-18deg);
}

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

.brand-name {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 900;
  letter-spacing: -0.02em;
}

.brand-suffix {
  font-family: var(--font-data);
  font-size: 0.64rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.brand-tagline {
  margin-left: 12px;
  padding-left: 12px;
  border-left: 1px solid var(--ridge);
  color: var(--ash);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

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

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

.nav-quick { display: none; }

.nav-link {
  position: relative;
  display: inline-block;
  padding: 10px 14px;
  border-radius: var(--r-pill);
  color: var(--chalk);
  font-size: 0.94rem;
  font-weight: 500;
  text-decoration: none;
  transition: color 0.2s, background-color 0.2s;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 4px;
  height: 2px;
  border-radius: 2px;
  background: var(--cyan);
  box-shadow: 0 0 10px rgba(52, 245, 197, 0.7);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.24s var(--ease);
}

.nav-link:hover {
  color: var(--cyan-soft);
  background: rgba(52, 245, 197, 0.07);
}

.nav-link:hover::after,
.nav-link:focus-visible::after { transform: scaleX(1); }

.nav-link[aria-current="page"] { color: var(--cyan); }
.nav-link[aria-current="page"]::after { transform: scaleX(1); }

/* 页头工具区与移动开关 */
.header-tools {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  border: 1px solid var(--ridge);
  border-radius: var(--r-pill);
  background: var(--glass);
  color: var(--chalk);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.5);
  transition: border-color 0.2s, color 0.2s, background-color 0.2s;
}

.nav-toggle:hover { border-color: var(--cyan); }

.nav-toggle[aria-expanded="true"] {
  border-color: var(--cyan);
  color: var(--cyan);
}

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.22s var(--ease);
}

.nav-toggle-bars::before { top: -6px; }
.nav-toggle-bars::after { top: 6px; }

.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { transform: translateY(-6px) rotate(-45deg); }

/* ---------- 11. 页脚 ---------- */
.site-footer {
  position: relative;
  z-index: 2;
  margin-top: clamp(48px, 8vw, 120px);
  padding-block: clamp(40px, 6vw, 72px) 28px;
  border-top: 1px solid var(--ridge);
  background: linear-gradient(180deg, var(--panel), #081814);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: min(420px, 60%);
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), rgba(52, 245, 197, 0));
}

.footer-shell {
  display: flex;
  flex-direction: column;
  gap: clamp(28px, 4vw, 46px);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 0.8fr 0.8fr 0.9fr 1.3fr;
  gap: clamp(20px, 3vw, 36px);
}

.footer-brand-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  color: var(--chalk);
  text-decoration: none;
}

.footer-brand-name {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 900;
  letter-spacing: -0.01em;
}

.footer-brand-line {
  max-width: 26em;
  color: var(--ash);
  font-size: 0.9rem;
}

.footer-closing {
  margin-top: 14px;
  font-family: var(--font-data);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--cyan-soft);
}

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

.footer-col-title {
  margin-bottom: 14px;
  font-family: var(--font-data);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
  list-style: none;
}

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--ash);
  font-size: 0.94rem;
  text-decoration: none;
  transition: color 0.2s, transform 0.2s var(--ease);
}

.footer-link::before {
  content: "";
  width: 9px;
  height: 1px;
  background: currentColor;
  opacity: 0.55;
}

.footer-link:hover,
.footer-link:focus-visible {
  color: var(--cyan);
  transform: translateX(3px);
}

.contact-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  list-style: none;
  margin-bottom: 14px;
}

.contact-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.contact-label {
  font-family: var(--font-data);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.contact-value {
  color: var(--chalk);
  font-size: 0.9rem;
  overflow-wrap: anywhere;
}

.contact-note {
  max-width: 30em;
  color: var(--ash);
  font-size: 0.8rem;
  line-height: 1.65;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 20px;
  padding-top: 22px;
  border-top: 1px solid var(--ridge);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.footer-icp,
.footer-copy {
  font-family: var(--font-data);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--ash);
}

.footer-copy [data-year] { color: var(--chalk); }

.to-top {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  border: 1px solid var(--ridge);
  border-radius: var(--r-pill);
  background: transparent;
  color: var(--ash);
  font-family: var(--font-body);
  font-size: 0.82rem;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, transform 0.2s var(--ease);
}

.to-top::before { content: "↑"; }

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

/* ---------- 12. 滚动显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 13. 响应式 ---------- */
@media (max-width: 1199px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 1100px) {
  .brand-tagline { display: none; }
  .layout-split { grid-template-columns: minmax(0, 1fr); }
  .layout-split__rail { position: static; }
  .data-rail {
    flex-direction: row;
    align-items: center;
    gap: 18px;
    overflow-x: auto;
  }
  .rail-item {
    flex: 0 0 auto;
    padding-bottom: 0;
    border-bottom: 0;
  }
}

@media (max-width: 1080px) {
  .span-3, .span-4 { grid-column: span 6; }
  .span-8, .span-6 { grid-column: span 12; }
}

@media (max-width: 900px) {
  .site-header { padding-block: 10px; }
  .site-header[data-header-state="solid"] { padding-block: 8px; }

  .header-cta { display: none; }

  .site-nav {
    position: fixed;
    left: 14px;
    right: 14px;
    bottom: 88px;
    z-index: 75;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
    max-height: min(68vh, 520px);
    overflow-y: auto;
    margin: 0;
    padding: 16px;
    border: 1px solid var(--ridge);
    border-radius: var(--r-xl);
    background: rgba(11, 30, 25, 0.98);
    box-shadow: 0 26px 60px rgba(0, 0, 0, 0.62);
    opacity: 0;
    visibility: hidden;
    transform: translateY(16px) scale(0.98);
    transition: opacity 0.22s var(--ease), transform 0.22s var(--ease), visibility 0.22s;
  }

  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
  }

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

  .nav-item { width: 100%; }

  .nav-link {
    display: block;
    width: 100%;
    padding: 13px 16px;
    border-radius: var(--r-sm);
    background: rgba(20, 64, 58, 0.28);
    font-size: 1rem;
  }

  .nav-link::after {
    left: 16px;
    right: auto;
    width: 26px;
    bottom: 9px;
  }

  .nav-quick {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding-top: 12px;
    border-top: 1px solid var(--ridge);
  }

  .nav-quick-label {
    width: 100%;
    font-family: var(--font-data);
    font-size: 0.7rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--ash);
  }

  .nav-toggle {
    display: inline-flex;
    position: fixed;
    left: 50%;
    bottom: 18px;
    z-index: 80;
    transform: translateX(-50%);
  }

  .site-footer { padding-bottom: 112px; }
}

@media (max-width: 760px) {
  .span-3, .span-4, .span-6, .span-8 { grid-column: span 12; }
  .bento-grid { gap: 14px; }
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-bottom { justify-content: flex-start; }
}

/* ---------- 14. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .header-progress { transition: none; }
}