/* ============================================================
   九游竞界 · 共享样式表 /assets/site.css
   设计基调：体育赛事数据面板 · 深蓝 × 橙 · 非对称 · 高密度分组
   ============================================================ */

/* ---------- 1. Reset & 基础 ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body {
  font-family: 'Roboto', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-ink);
  background: #eef1f6;
  min-height: 100vh;
}

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

ul,
ol {
  list-style: none;
}

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

a:hover {
  color: var(--color-orange);
}

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

button {
  background: none;
  border: none;
  cursor: pointer;
}

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

main,
#main-content {
  display: block;
  min-height: 60vh;
}

/* ---------- 2. CSS 变量 ---------- */
:root {
  /* 色彩 */
  --color-deep-blue: #0A1E3C;
  --color-deep-blue-light: #122a4f;
  --color-orange: #FF6A00;
  --color-orange-soft: #FF9E40;
  --color-light-gray: #F2F4F7;
  --color-ink: #0B0F14;
  --color-white: #FFFFFF;
  --color-cyan: #00C2FF;
  --color-success: #00D68F;
  --color-warning: #FFD200;
  --color-gray-blue: #8C9AA8;
  --border-color: #e2e7ef;

  /* 字体 */
  --font-heading: Impact, 'Bebas Neue', 'Arial Black', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Roboto', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Menlo', 'Courier New', monospace;

  /* 版式 */
  --container: 1200px;
  --container-narrow: 820px;
  --container-wide: 1420px;
  --header-h: 76px;
  --header-h-mobile: 62px;
  --header-h-scrolled: 62px;

  /* 圆角 / 阴影 */
  --radius-sm: 4px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 2px 10px rgba(10, 30, 60, 0.08);
  --shadow-md: 0 8px 30px rgba(10, 30, 60, 0.14);
  --shadow-header: 0 4px 24px rgba(2, 12, 30, 0.45);

  /* 动效 */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --transition-fast: 180ms ease;
  --transition-md: 320ms var(--ease-out);
  --transition-slow: 560ms var(--ease-out);
}

/* ---------- 3. 排版 ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 900;
  line-height: 1.12;
  color: var(--color-deep-blue);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  margin-bottom: 1rem;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 1.25rem;
}

h3 {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}

h4 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

h5 {
  font-size: 1.125rem;
  margin-bottom: 0.5rem;
}

h6 {
  font-size: 1rem;
  margin-bottom: 0.375rem;
}

p {
  margin-bottom: 1rem;
}

strong {
  font-weight: 700;
}

code,
.mono,
.data-number {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

blockquote {
  margin: 1.5rem 0;
  padding-left: 1.25rem;
  border-left: 4px solid var(--color-orange);
  color: #4a5568;
  font-style: italic;
}

/* ---------- 4. 容器 ---------- */
.container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(1rem, 3vw, 2rem);
}

.container-narrow {
  max-width: var(--container-narrow);
  margin-inline: auto;
  padding-inline: clamp(1rem, 3vw, 2rem);
}

.container-wide {
  max-width: var(--container-wide);
  margin-inline: auto;
  padding-inline: clamp(1rem, 3vw, 2rem);
}

/* ---------- 5. 章节 ---------- */
.section {
  position: relative;
  padding-block: clamp(3rem, 8vw, 5.5rem);
}

.section-dark {
  background: var(--color-deep-blue);
  color: rgba(255, 255, 255, 0.82);
}

.section-dark h1,
.section-dark h2,
.section-dark h3,
.section-dark h4,
.section-dark h5,
.section-dark h6 {
  color: var(--color-white);
}

.section-light {
  background: var(--color-light-gray);
}

.section-dark + .section-light {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

/* ---------- 6. 工具类 ---------- */
.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: -100%;
  left: 1rem;
  z-index: 10000;
  background: var(--color-orange);
  color: var(--color-white);
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.9rem;
  box-shadow: var(--shadow-md);
  transition: top var(--transition-md);
}

.skip-link:focus-visible {
  top: 0.75rem;
  color: var(--color-white);
}

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.5rem;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  line-height: 1.2;
  text-align: center;
  cursor: pointer;
  border: 2px solid transparent;
  transition: background var(--transition-fast),
              color var(--transition-fast),
              border-color var(--transition-fast),
              transform var(--transition-fast),
              box-shadow var(--transition-fast);
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: var(--color-orange);
  color: var(--color-white);
  box-shadow: 0 4px 14px rgba(255, 106, 0, 0.35);
}

.btn-primary:hover {
  background: var(--color-orange-soft);
  color: var(--color-white);
  box-shadow: 0 6px 20px rgba(255, 106, 0, 0.45);
}

.btn-outline {
  background: transparent;
  border-color: var(--color-orange);
  color: var(--color-orange);
}

.btn-outline:hover {
  background: var(--color-orange);
  color: var(--color-white);
}

.btn-ghost {
  background: transparent;
  border-color: var(--border-color);
  color: var(--color-deep-blue);
}

.btn-ghost:hover {
  border-color: var(--color-deep-blue);
  color: var(--color-deep-blue);
}

.btn-dark {
  background: var(--color-deep-blue);
  color: var(--color-white);
}

.btn-dark:hover {
  background: var(--color-deep-blue-light);
  color: var(--color-white);
}

.btn-sm {
  padding: 0.4rem 0.9rem;
  font-size: 0.78rem;
  border-width: 1px;
}

.btn-lg {
  padding: 0.95rem 2rem;
  font-size: 1.05rem;
}

.btn-block {
  display: flex;
  width: 100%;
}

/* ---------- 8. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  color: var(--color-gray-blue);
  padding: 0.9rem 0;
}

.breadcrumb a {
  color: var(--color-gray-blue);
  transition: color var(--transition-fast);
}

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

.breadcrumb-sep {
  opacity: 0.5;
  user-select: none;
}

.breadcrumb [aria-current="page"] {
  color: var(--color-ink);
  font-weight: 600;
}

/* ---------- 9. 网格 ---------- */
.grid {
  display: grid;
  gap: clamp(1rem, 2.5vw, 1.75rem);
}

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

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

.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.grid-gap-sm {
  gap: 0.75rem;
}

.grid-gap-lg {
  gap: clamp(1.5rem, 4vw, 3rem);
}

/* ---------- 10. 卡片 ---------- */
.card {
  background: var(--color-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow var(--transition-md),
              transform var(--transition-md);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem 1.4rem;
  border-bottom: 1px solid var(--border-color);
  background: rgba(242, 244, 247, 0.5);
}

.card-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  letter-spacing: 0.04em;
  margin: 0;
  color: var(--color-deep-blue);
}

.card-body {
  padding: 1.4rem;
}

.card-dark {
  background: var(--color-deep-blue);
  border-color: var(--color-deep-blue);
  color: rgba(255, 255, 255, 0.82);
}

.card-dark .card-title {
  color: var(--color-white);
}

.card-dark .card-header {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.1);
}

/* ---------- 11. 媒体容器 ---------- */
.media {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-deep-blue), #152f57);
  border-radius: var(--radius-md);
}

.media::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(-45deg, rgba(255, 255, 255, 0.035) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, 0.035) 50%, rgba(255, 255, 255, 0.035) 75%, transparent 75%);
  background-size: 16px 16px;
  pointer-events: none;
}

.media img,
.media picture,
.media video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-16-9 {
  aspect-ratio: 16 / 9;
}

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

.media-3-2 {
  aspect-ratio: 3 / 2;
}

.media-1-1 {
  aspect-ratio: 1 / 1;
}

.media-rounded {
  border-radius: var(--radius-lg);
}

/* ---------- 12. 徽章 ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.2rem 0.7rem;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--color-light-gray);
  color: var(--color-deep-blue);
  border: 1px solid var(--border-color);
}

.badge-live {
  background: rgba(0, 214, 143, 0.14);
  color: var(--color-success);
  border-color: rgba(0, 214, 143, 0.4);
}

.badge-orange {
  background: rgba(255, 106, 0, 0.12);
  color: var(--color-orange);
  border-color: rgba(255, 106, 0, 0.35);
}

.badge-cyan {
  background: rgba(0, 194, 255, 0.12);
  color: var(--color-cyan);
  border-color: rgba(0, 194, 255, 0.35);
}

.badge-warning {
  background: rgba(255, 210, 0, 0.14);
  color: var(--color-warning);
  border-color: rgba(255, 210, 0, 0.4);
}

/* ---------- 13. 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: linear-gradient(135deg, #081832, #0c2244 70%, #0e2850);
  color: var(--color-white);
  box-shadow: var(--shadow-header);
}

.site-header::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-orange) 0%, transparent 35%, var(--color-cyan) 100%);
  opacity: 0.65;
  pointer-events: none;
}

.scroll-progress {
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-orange), var(--color-cyan));
  z-index: 2;
  transition: width 100ms linear;
}

.header-shell {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(1rem, 3vw, 2rem);
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 1.5rem;
  transition: height var(--transition-md);
}

.site-header[data-scrolled] .header-shell {
  height: var(--header-h-scrolled);
}

.site-header[data-scrolled] {
  box-shadow: 0 8px 32px rgba(2, 10, 26, 0.65);
}

/* 品牌 */
.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  flex-shrink: 0;
  color: var(--color-white);
}

.site-brand:hover {
  color: var(--color-white);
}

.brand-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--color-orange), var(--color-orange-soft));
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--color-white);
  line-height: 1;
  transition: transform var(--transition-md);
}

.site-brand:hover .brand-mark {
  transform: translateY(-2px) rotate(-3deg);
}

.brand-copy {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 1.45rem;
  font-weight: 900;
  letter-spacing: 0.05em;
  color: var(--color-white);
  border-bottom: 2px solid transparent;
  background: linear-gradient(90deg, var(--color-orange), var(--color-orange-soft));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.22em;
  color: rgba(255, 255, 255, 0.55);
  margin-top: 0.15rem;
}

/* 导航 */
.main-nav {
  flex: 1;
  display: flex;
  justify-content: center;
  min-width: 0;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.1rem;
  counter-reset: navCnt;
}

.nav-item {
  counter-increment: navCnt;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 0.3rem;
  padding: 0.55rem 0.7rem;
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast),
              background var(--transition-fast);
}

.nav-link::before {
  content: counter(navCnt, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 0.58rem;
  font-weight: 700;
  color: var(--color-orange);
  opacity: 0.75;
  letter-spacing: 0;
}

.nav-link:hover {
  color: var(--color-orange-soft);
  background: rgba(255, 255, 255, 0.06);
}

.nav-link[aria-current="page"] {
  color: var(--color-orange);
}

.nav-link[aria-current="page"]::after {
  content: '';
  position: absolute;
  left: 0.65rem;
  right: 0.65rem;
  bottom: 0.18rem;
  height: 2px;
  border-radius: 1px;
  background: var(--color-orange);
}

.site-header[data-scrolled] .nav-link {
  padding-block: 0.4rem;
  font-size: 0.8rem;
}

/* 状态区 */
.header-status {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  flex-shrink: 0;
}

.live-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  background: rgba(0, 214, 143, 0.12);
  border: 1px solid rgba(0, 214, 143, 0.4);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--color-success);
}

.live-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-success);
  animation: livePulse 1.8s ease-out infinite;
}

@keyframes livePulse {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(0, 214, 143, 0.55);
  }
  50% {
    box-shadow: 0 0 0 6px rgba(0, 214, 143, 0);
  }
}

.header-clock {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-cyan);
  letter-spacing: 0.08em;
  font-variant-numeric: tabular-nums;
}

/* 移动端导航开关 */
.nav-toggle {
  display: none;
  position: relative;
  width: 42px;
  height: 42px;
  flex-shrink: 0;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.04);
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.nav-toggle:hover {
  border-color: var(--color-orange);
  background: rgba(255, 106, 0, 0.12);
}

.nav-toggle-line {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 18px;
  height: 2px;
  background: var(--color-white);
  border-radius: 1px;
  transition: transform var(--transition-md),
              opacity var(--transition-fast);
}

.nav-toggle-line:nth-child(1) {
  transform: translate(-50%, calc(-50% - 5px));
}

.nav-toggle-line:nth-child(2) {
  transform: translate(-50%, -50%);
}

.nav-toggle-line:nth-child(3) {
  transform: translate(-50%, calc(-50% + 5px));
}

[data-nav-toggle][aria-expanded="true"] .nav-toggle-line:nth-child(1) {
  transform: translate(-50%, -50%) rotate(45deg);
}

[data-nav-toggle][aria-expanded="true"] .nav-toggle-line:nth-child(2) {
  transform: translate(-50%, -50%) scaleX(0);
  opacity: 0;
}

[data-nav-toggle][aria-expanded="true"] .nav-toggle-line:nth-child(3) {
  transform: translate(-50%, -50%) rotate(-45deg);
}

/* ---------- 14. 页脚 ---------- */
.site-footer {
  position: relative;
  background: linear-gradient(160deg, #071323, #0a1e3c 55%, #0d2547);
  color: rgba(255, 255, 255, 0.75);
  margin-top: auto;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-orange), var(--color-cyan), var(--color-orange-soft));
  opacity: 0.9;
}

.footer-shell {
  max-width: var(--container);
  margin-inline: auto;
  padding: clamp(2.5rem, 6vw, 4.5rem) clamp(1rem, 3vw, 2rem) 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.35fr 0.8fr 1fr 1.1fr;
  gap: clamp(1.5rem, 4vw, 3rem);
}

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

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--color-white);
}

.footer-logo:hover {
  color: var(--color-white);
}

.footer-logo-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-orange), var(--color-orange-soft));
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 900;
  color: var(--color-white);
  line-height: 1;
}

.footer-logo-text {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  background: linear-gradient(90deg, var(--color-orange), var(--color-orange-soft));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.footer-trust {
  font-size: 0.8rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.5);
  max-width: 30ch;
}

.footer-heading {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-orange-soft);
  margin-bottom: 1.1rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer-list a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.875rem;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.footer-list a:hover {
  color: var(--color-orange-soft);
  padding-left: 0.25rem;
}

.footer-list a[aria-current="page"] {
  color: var(--color-orange);
}

.footer-contact-list {
  gap: 0.9rem;
}

.footer-contact-item {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.footer-label {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.38);
}

.footer-value {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.82);
  line-height: 1.45;
}

.footer-note {
  font-size: 0.8rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.55);
  margin-bottom: 1.2rem;
}

.footer-legal {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 1rem;
  gap: 0.45rem;
}

.footer-legal a {
  color: var(--color-cyan);
}

.footer-legal a:hover {
  color: var(--color-orange-soft);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem 1.5rem;
  margin-top: 2.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.42);
}

.copyright {
  font-family: var(--font-mono);
  margin: 0;
}

.footer-disclaimer {
  margin: 0;
}

/* ---------- 15. 滚动显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-slow),
              transform var(--transition-slow);
}

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

/* ---------- 16. 响应式 ---------- */
@media (max-width: 1023px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (max-width: 899px) {
  .header-shell {
    height: var(--header-h-mobile);
    gap: 0.75rem;
  }

  .site-header[data-scrolled] .header-shell {
    height: 56px;
  }

  .nav-toggle {
    display: block;
  }

  .main-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 999;
    background: linear-gradient(to bottom, var(--color-deep-blue), #0d2547);
    border-bottom: 3px solid var(--color-orange);
    padding: 0.75rem 0 1rem;
    box-shadow: 0 20px 40px rgba(2, 10, 26, 0.55);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 280ms var(--ease-out),
                transform 280ms var(--ease-out),
                visibility 0s linear 280ms;
  }

  .main-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    transition: opacity 280ms var(--ease-out),
                transform 280ms var(--ease-out),
                visibility 0s linear 0s;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
  }

  .nav-item {
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }

  .nav-item:last-child {
    border-bottom: none;
  }

  .nav-link {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    padding: 0.95rem 1.5rem;
    font-size: 1rem;
    width: 100%;
    border-radius: 0;
  }

  .nav-link::before {
    font-size: 0.68rem;
  }

  .nav-link[aria-current="page"]::after {
    left: 0;
    right: auto;
    top: 0;
    bottom: 0;
    width: 4px;
    height: auto;
    border-radius: 0;
  }

  .site-header[data-scrolled] .nav-link {
    padding-block: 0.95rem;
    font-size: 1rem;
  }

  .brand-mark {
    width: 36px;
    height: 36px;
    font-size: 1.2rem;
  }

  .brand-name {
    font-size: 1.15rem;
  }

  .brand-sub {
    font-size: 0.5rem;
  }

  .header-status {
    gap: 0.5rem;
    margin-left: auto;
  }
}

@media (max-width: 599px) {
  .live-text {
    display: none;
  }

  .live-badge {
    padding: 0.25rem 0.55rem;
  }

  .header-clock {
    font-size: 0.7rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2.25rem;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: minmax(0, 1fr);
  }

  .card-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
}

@media (max-width: 419px) {
  .brand-name {
    font-size: 1.05rem;
  }

  .brand-mark {
    width: 32px;
    height: 32px;
    font-size: 1rem;
  }

  .header-clock {
    display: none;
  }

  .header-shell {
    gap: 0.5rem;
  }
}

/* ---------- 17. 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0ms !important;
  }

  .live-dot {
    animation: none !important;
    box-shadow: none !important;
  }

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

  .scroll-progress {
    transition: none !important;
  }
}