/* ============================================================
   万博MAX中国站 /assets/site.css
   Site Kit — 共享样式
   ============================================================ */

/* ---------- 1. CSS Variables ---------- */
:root {
  --color-space: #0A1128;
  --color-deep-sea: #1C2541;
  --color-gold: #D4AF37;
  --color-neon-purple: #8A2BE2;
  --color-deep-purple: #4B0082;
  --color-lime: #C6FF00;
  --color-coral: #FF6B6B;
  --color-silver: #E0E4EB;
  --color-soft-blue-gray: #B0B7C3;
  --color-mint: #00D2A0;

  --font-heading: 'Exo 2', 'Noto Sans SC', sans-serif;
  --font-body: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --container: 1200px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --space-6: 48px;
  --space-7: 64px;

  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.3);
  --border-strong: 2px;
  --transition-fast: 0.2s ease;
}

/* ---------- 2. Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-silver);
  background-color: var(--color-space);
  min-height: 100vh;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.02em;
  margin: 0 0 var(--space-3) 0;
}

p {
  margin: 0 0 var(--space-3) 0;
}

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

a {
  color: var(--color-gold);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

ul, ol {
  padding: 0;
  margin: 0;
  list-style-position: inside;
}

button {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  border: none;
  background: none;
  cursor: pointer;
}

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

/* ---------- 3. 辅助工具 ---------- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

/* ---------- 4. 页眉 ---------- */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-3);
  z-index: 9999;
  background: var(--color-gold);
  color: var(--color-space);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 14px;
  padding: 10px 20px;
  border-radius: 0 0 6px 6px;
  text-decoration: none;
  transition: top var(--transition-fast);
}

.skip-link:focus-visible {
  top: 0;
  outline: none;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-neon-purple), var(--color-gold));
  z-index: 1001;
  pointer-events: none;
}

.site-header {
  position: relative;
  background: var(--color-space);
  border-bottom: 1px solid rgba(176, 183, 195, 0.15);
  z-index: 100;
}

.site-header::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: linear-gradient(90deg,
    transparent,
    rgba(138, 43, 226, 0.7) 30%,
    rgba(212, 175, 55, 0.7) 70%,
    transparent);
}

.header-inner {
  position: relative;
  max-width: var(--container);
  margin: 0 auto;
  padding: var(--space-4) var(--space-4) 0;
}

.masthead {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: var(--space-3);
  border-bottom: 1px solid rgba(176, 183, 195, 0.12);
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  text-decoration: none;
  line-height: 1;
}

.brand-symbol {
  font-family: var(--font-heading);
  font-size: 32px;
  font-weight: 800;
  letter-spacing: 2px;
  color: var(--color-silver);
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--color-gold);
}

.masthead-meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.lang-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 1px;
  color: var(--color-soft-blue-gray);
  border: 1px solid rgba(176, 183, 195, 0.5);
  padding: 3px 10px;
  border-radius: 2px;
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid rgba(176, 183, 195, 0.35);
  border-radius: 4px;
  padding: 8px 10px;
  color: var(--color-silver);
  transition: border-color var(--transition-fast);
}

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

.nav-toggle-icon {
  display: block;
  width: 20px;
  height: 2px;
  background: currentColor;
  position: relative;
  transition: background-color 0.2s ease;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: '';
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: currentColor;
  transition: transform 0.3s ease;
}

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

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

.nav-toggle[aria-expanded="true"] .nav-toggle-icon {
  background-color: transparent;
}

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

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

.site-nav {
  display: flex;
  justify-content: center;
}

.nav-list {
  display: flex;
  justify-content: center;
  align-items: center;
  list-style: none;
  flex-wrap: wrap;
  padding: 0;
  margin: 0;
}

.nav-list li {
  display: flex;
  align-items: center;
  position: relative;
}

.nav-list li + li::before {
  content: '/';
  color: rgba(176, 183, 195, 0.3);
  font-family: var(--font-mono);
  font-size: 12px;
  margin-right: 4px;
}

.nav-list a {
  display: block;
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.5px;
  color: var(--color-soft-blue-gray);
  text-decoration: none;
  transition: color var(--transition-fast), background-color var(--transition-fast);
  border-radius: 2px;
  position: relative;
}

.nav-list a:hover {
  color: var(--color-silver);
  background: rgba(176, 183, 195, 0.08);
}

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

.nav-list a[aria-current="page"]::after {
  content: '';
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-gold), var(--color-neon-purple));
  border-radius: 1px;
}

/* ---------- 5. 页脚 ---------- */
.site-footer {
  position: relative;
  z-index: 10;
  background: var(--color-deep-sea);
  border-top: 2px solid rgba(138, 43, 226, 0.4);
  margin-top: var(--space-7);
  padding: var(--space-6) 0 0;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg,
    transparent,
    var(--color-neon-purple),
    var(--color-gold),
    transparent);
}

.footer-grid {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-4) var(--space-5);
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: var(--space-5);
}

.footer-brand .brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  margin-bottom: var(--space-3);
}

.footer-brand .brand-symbol {
  font-size: 28px;
  color: var(--color-silver);
}

.footer-brand .brand-name {
  font-size: 16px;
  color: var(--color-gold);
}

.footer-tagline {
  font-size: 15px;
  line-height: 1.6;
  color: var(--color-soft-blue-gray);
  margin-bottom: var(--space-3);
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-soft-blue-gray);
  margin: 0;
}

.footer-heading {
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-gold);
  margin-bottom: var(--space-3);
}

.footer-link {
  display: block;
  width: fit-content;
  color: var(--color-silver);
  font-family: var(--font-mono);
  font-size: 14px;
  text-decoration: none;
  margin-bottom: var(--space-1);
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--color-gold);
}

.footer-note {
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-soft-blue-gray);
  margin-top: var(--space-2);
}

.footer-address p {
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-soft-blue-gray);
  margin-bottom: var(--space-1);
}

.footer-address p:last-child {
  font-family: var(--font-mono);
  font-size: 13px;
}

.footer-bottom {
  border-top: 1px solid rgba(176, 183, 195, 0.15);
  padding: var(--space-3) var(--space-4);
  max-width: var(--container);
  margin: 0 auto;
  display: flex;
  justify-content: center;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 14px;
}

.footer-links a {
  color: var(--color-soft-blue-gray);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-gold);
}

/* ---------- 6. 通用排版与内容组件 ---------- */
.page-header {
  padding: var(--space-6) 0 var(--space-4);
  border-bottom: 1px solid rgba(176, 183, 195, 0.15);
  margin-bottom: var(--space-5);
}

.page-title {
  font-family: var(--font-heading);
  font-size: 48px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--color-silver);
  margin: 0 0 var(--space-3);
}

.lead-para {
  font-size: 18px;
  line-height: 1.7;
  color: var(--color-soft-blue-gray);
  max-width: 720px;
}

.display-title {
  font-family: var(--font-heading);
  font-size: clamp(40px, 6vw, 72px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: 0.03em;
  color: var(--color-silver);
  margin: 0 0 var(--space-4);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-soft-blue-gray);
  margin-bottom: var(--space-3);
}

.breadcrumbs a {
  color: var(--color-mint);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.breadcrumbs a:hover {
  color: var(--color-gold);
}

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

.breadcrumbs span + span::before {
  content: '/';
  margin-right: var(--space-1);
  color: rgba(176, 183, 195, 0.4);
}

.section {
  padding: var(--space-6) 0;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 32px;
  font-weight: 700;
  color: var(--color-silver);
  padding-left: 18px;
  border-left: 4px solid var(--color-gold);
  margin-bottom: var(--space-4);
}

.card {
  background: linear-gradient(135deg, var(--color-deep-sea), rgba(28, 37, 65, 0.75));
  border: 1px solid rgba(176, 183, 195, 0.15);
  border-radius: 8px;
  box-shadow: var(--shadow-card);
  padding: var(--space-4);
}

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-block;
  padding: 12px 24px;
  border: 2px solid var(--color-gold);
  border-radius: 4px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--color-gold);
  background: transparent;
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.btn:hover,
.btn:focus-visible {
  background: var(--color-gold);
  color: var(--color-space);
  border-color: var(--color-gold);
}

.btn--primary {
  background: var(--color-gold);
  color: var(--color-space);
  border-color: var(--color-gold);
}

.btn--primary:hover,
.btn--primary:focus-visible {
  background: transparent;
  color: var(--color-gold);
}

.btn--coral {
  border-color: var(--color-coral);
  color: var(--color-coral);
}

.btn--coral:hover,
.btn--coral:focus-visible {
  background: var(--color-coral);
  color: var(--color-space);
  border-color: var(--color-coral);
}

/* ---------- 8. 布局与装饰组件 ---------- */
.layout-with-rail {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: var(--space-5);
  max-width: var(--container);
  margin: 0 auto;
  padding: var(--space-5) var(--space-4) var(--space-7);
}

.brand-rail {
  border-right: 1px solid rgba(176, 183, 195, 0.2);
  padding-right: var(--space-4);
  position: sticky;
  top: var(--space-4);
  align-self: start;
  min-width: 0;
}

.brand-rail__index {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 2px;
  color: var(--color-mint);
  margin-bottom: var(--space-3);
}

.data-stream {
  height: 4px;
  border-radius: 2px;
  background-image: linear-gradient(90deg, transparent, var(--color-neon-purple), var(--color-gold), transparent);
  background-size: 200% 100%;
  animation: dataFlow 3s linear infinite;
  opacity: 0.6;
}

@keyframes dataFlow {
  from { background-position: 0 0; }
  to { background-position: 200% 0; }
}

/* ---------- 9. 图片占位框架 ---------- */
.image-frame {
  display: block;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-deep-sea), #131a30);
  border: 1px solid rgba(176, 183, 195, 0.15);
  border-radius: 6px;
  box-shadow: var(--shadow-card);
  aspect-ratio: 16 / 9;
}

.image-frame[data-ratio="wide"] { aspect-ratio: 21 / 9; }
.image-frame[data-ratio="standard"] { aspect-ratio: 4 / 3; }
.image-frame[data-ratio="square"] { aspect-ratio: 1 / 1; }

.image-frame::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 30% 20%, rgba(138, 43, 226, 0.15), transparent 50%),
    radial-gradient(circle at 70% 80%, rgba(0, 210, 160, 0.12), transparent 50%);
  transition: opacity var(--transition-fast);
}

.image-frame:hover::before {
  opacity: 0.7;
}

.image-frame[data-label]::after {
  content: attr(data-label);
  position: absolute;
  left: 12px;
  bottom: 12px;
  padding: 4px 12px;
  background: rgba(10, 17, 40, 0.85);
  border-left: 2px solid var(--color-gold);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-soft-blue-gray);
  border-radius: 0 2px 2px 0;
}

/* ---------- 10. 响应式断点 ---------- */
@media (max-width: 960px) {
  .layout-with-rail {
    grid-template-columns: 1fr;
    padding-top: var(--space-4);
  }

  .brand-rail {
    border-right: none;
    border-bottom: 1px solid rgba(176, 183, 195, 0.2);
    padding-right: 0;
    padding-bottom: var(--space-3);
    position: static;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }
}

@media (max-width: 768px) {
  .header-inner {
    padding-top: var(--space-3);
  }

  .masthead {
    padding-bottom: var(--space-2);
  }

  .brand-symbol {
    font-size: 26px;
  }

  .brand-name {
    font-size: 16px;
  }

  .lang-badge {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .site-nav {
    display: block;
    width: 100%;
    margin-top: 0;
  }

  .site-nav .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    border-top: 1px solid rgba(176, 183, 195, 0.12);
    padding-top: var(--space-2);
  }

  .site-nav[data-open] .nav-list {
    display: flex;
  }

  .nav-list li {
    justify-content: center;
  }

  .nav-list li + li::before {
    content: none;
  }

  .nav-list a {
    padding: 12px 8px;
    text-align: center;
    font-size: 15px;
    border-bottom: 1px solid rgba(176, 183, 195, 0.06);
  }

  .nav-list a[aria-current="page"]::after {
    left: 40%;
    right: 40%;
  }

  .page-title {
    font-size: 36px;
  }

  .lead-para {
    font-size: 16px;
  }

  .footer-bottom {
    justify-content: flex-start;
  }

  .footer-links {
    flex-wrap: wrap;
    gap: var(--space-3);
  }
}

/* ---------- 11. 无障碍：减少动效 ---------- */
@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;
    scroll-behavior: auto !important;
  }
}