/* ═══════════════════════════════════════════════════════════
   VUC Component Library v1.0 — 虚拟宇宙公司共享组件
   依赖: vuc-tokens.css (提供所有 CSS 自定义属性)
   用途: 所有子页面统一引用，替代各页面重复的内联样式
   ═══════════════════════════════════════════════════════════ */

/* ═══ 1. Glassmorphism Card ─ 玻璃态卡片 ═══ */
.vuc-card {
  background: var(--vuc-glass-bg, rgba(16,16,32,0.85));
  border: 1px solid var(--vuc-glass-border, rgba(0,255,136,0.2));
  border-radius: var(--vuc-radius-lg, 16px);
  backdrop-filter: blur(var(--vuc-glass-blur, 12px));
  -webkit-backdrop-filter: blur(var(--vuc-glass-blur, 12px));
  transition: all .3s ease;
  overflow: hidden;
}
.vuc-card:hover {
  transform: translateY(-4px);
  border-color: var(--vuc-green, #00ff88);
  box-shadow: 0 12px 40px var(--vuc-glass-glow, rgba(0,255,136,0.15));
}
.vuc-card--dim {
  background: rgba(16,16,32,0.6);
  border-color: rgba(255,255,255,0.08);
}

/* ═══ 2. Hero Section ─ 英雄区 ═══ */
.vuc-hero {
  position: relative;
  min-height: 50vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--vuc-space-xl, 40px) var(--vuc-space-lg, 24px);
  overflow: hidden;
}
.vuc-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 30% 20%, rgba(0,255,136,0.08), transparent 60%),
    radial-gradient(ellipse at 70% 80%, rgba(124,92,255,0.06), transparent 50%);
  pointer-events: none;
  z-index: 0;
}
.vuc-hero__content {
  position: relative;
  z-index: 1;
  max-width: 800px;
}
.vuc-hero__title {
  font-size: clamp(28px, 5vw, 56px);
  font-weight: 900;
  line-height: 1.1;
  margin: 0 0 var(--vuc-space-md, 16px);
  color: #fff;
}
.vuc-hero__title span { color: var(--vuc-green, #00ff88); }
.vuc-hero__subtitle {
  font-size: clamp(15px, 2vw, 20px);
  color: var(--vuc-fg-dim, rgba(232,232,240,0.65));
  line-height: 1.7;
  max-width: 600px;
  margin: 0 auto;
}

/* ═══ 3. Buttons ─ 按钮体系 ═══ */
.vuc-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 26px;
  border: none;
  border-radius: var(--vuc-radius-md, 12px);
  font-family: inherit;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  transition: all .25s ease;
  letter-spacing: .02em;
}
.vuc-btn--primary {
  background: linear-gradient(135deg, #00ff88, #6ca0dc);
  color: #05101a;
  box-shadow: 0 8px 28px rgba(0,255,136,0.28);
}
.vuc-btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 36px rgba(0,255,136,0.38);
}
.vuc-btn--secondary {
  background: transparent;
  border: 1px solid var(--vuc-glass-border, rgba(0,255,136,0.2));
  color: var(--vuc-green, #00ff88);
}
.vuc-btn--secondary:hover {
  background: rgba(0,255,136,0.08);
  border-color: var(--vuc-green, #00ff88);
}
.vuc-btn--gold {
  background: linear-gradient(135deg, #c9a84c, #ffdc7a);
  color: #10131d;
  box-shadow: 0 8px 28px rgba(201,168,76,0.28);
}
.vuc-btn--gold:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 36px rgba(201,168,76,0.38);
}

/* ═══ 4. Grid Layouts ─ 布局辅助 ═══ */
.vuc-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--vuc-space-lg, 24px);
}
.vuc-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--vuc-space-lg, 24px);
}
.vuc-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--vuc-space-lg, 24px);
}
@media (max-width: 900px) {
  .vuc-grid-2, .vuc-grid-3, .vuc-grid-4 { grid-template-columns: 1fr; }
}
@media (min-width: 601px) and (max-width: 1200px) {
  .vuc-grid-3 { grid-template-columns: repeat(2, 1fr); }
  .vuc-grid-4 { grid-template-columns: repeat(2, 1fr); }
}

/* ═══ 5. Timeline ─ 交替式时间线 ═══ */
.vuc-timeline {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  padding: var(--vuc-space-xl, 40px) 0;
}
.vuc-timeline::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom,
    transparent,
    var(--vuc-green, #00ff88),
    var(--vuc-purple, #7b5cff),
    transparent);
  transform: translateX(-50%);
}
.vuc-tl-item {
  position: relative;
  display: flex;
  gap: 30px;
  margin-bottom: var(--vuc-space-xl, 40px);
}
.vuc-tl-item:nth-child(odd) { flex-direction: row-reverse; }
.vuc-tl-dot {
  position: absolute;
  left: 50%;
  top: 20px;
  width: 14px;
  height: 14px;
  background: var(--vuc-green, #00ff88);
  border-radius: 50%;
  transform: translateX(-50%);
  box-shadow: 0 0 16px rgba(0,255,136,0.5);
  z-index: 2;
}
.vuc-tl-content {
  flex: 1;
  max-width: calc(50% - 50px);
}
@media (max-width: 768px) {
  .vuc-timeline::before { left: 20px; }
  .vuc-tl-item, .vuc-tl-item:nth-child(odd) { flex-direction: column; }
  .vuc-tl-dot { left: 20px; }
  .vuc-tl-content { max-width: 100%; padding-left: 50px; }
}

/* ═══ 6. Section Headers ─ 分区标题 ═══ */
.vuc-section {
  max-width: 1200px;
  margin: var(--vuc-space-xl, 40px) auto;
  padding: 0 var(--vuc-space-lg, 24px);
}
.vuc-section__header {
  text-align: center;
  margin-bottom: var(--vuc-space-xl, 40px);
}
.vuc-section__kicker {
  display: inline-block;
  padding: 5px 14px;
  border: 1px solid rgba(0,255,136,0.25);
  border-radius: 99px;
  color: var(--vuc-green, #00ff88);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  margin-bottom: var(--vuc-space-md, 16px);
}
.vuc-section__title {
  font-size: clamp(24px, 4vw, 42px);
  font-weight: 900;
  color: #fff;
  margin: 0 0 12px;
}
.vuc-section__desc {
  color: var(--vuc-fg-dim, rgba(232,232,240,0.65));
  font-size: 15px;
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ═══ 7. Stat Cards ─ 数据卡片 ═══ */
.vuc-stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: var(--vuc-space-md, 16px); }
.vuc-stat-card {
  text-align: center;
  padding: var(--vuc-space-lg, 24px);
  border-radius: var(--vuc-radius-lg, 16px);
  background: rgba(16,16,32,0.5);
  border: 1px solid rgba(255,255,255,0.06);
  transition: all .3s;
}
.vuc-stat-card:hover {
  background: rgba(16,16,32,0.8);
  border-color: var(--vuc-glass-border, rgba(0,255,136,0.2));
}
.vuc-stat-card__value {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 900;
  font-family: 'Orbitron', monospace;
  color: var(--vuc-green, #00ff88);
}
.vuc-stat-card__label {
  font-size: 13px;
  color: var(--vuc-fg-muted, rgba(232,232,240,0.4));
  margin-top: 6px;
}

/* ═══ 8. Tags & Badges ═══ */
.vuc-badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 99px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .06em;
}
.vuc-badge--green  { background: rgba(0,255,136,0.12); color: #00ff88; }
.vuc-badge--cyan   { background: rgba(108,160,220,0.12); color: #6ca0dc; }
.vuc-badge--purple { background: rgba(124,92,255,0.12); color: #7b5cff; }
.vuc-badge--gold   { background: rgba(201,168,76,0.12); color: #c9a84c; }
.vuc-badge--red    { background: rgba(255,77,77,0.12); color: #ff4d4d; }

/* ═══ 9. Table ─ 规格/数据表 ═══ */
.vuc-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 14px;
}
.vuc-table th {
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  color: var(--vuc-green, #00ff88);
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.vuc-table td {
  padding: 12px 16px;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  color: var(--vuc-fg, #e8e8f0);
}
.vuc-table tr:hover td { background: rgba(0,255,136,0.04); }

/* ═══ 10. Nav Dropdown ─ 导航下拉菜单 ═══ */
.vuc-dropdown {
  position: relative;
  display: inline-block;
}
.vuc-dropdown__menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 180px;
  background: var(--vuc-glass-bg, rgba(16,16,32,0.92));
  border: 1px solid var(--vuc-glass-border, rgba(0,255,136,0.2));
  border-radius: var(--vuc-radius-md, 12px);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
  padding: 8px;
  z-index: 100;
}
.vuc-dropdown:hover .vuc-dropdown__menu { display: block; }
.vuc-dropdown__menu a {
  display: block;
  padding: 10px 14px;
  border-radius: 8px;
  color: var(--vuc-fg-dim, rgba(232,232,240,0.65));
  text-decoration: none;
  font-size: 14px;
  transition: all .2s;
}
.vuc-dropdown__menu a:hover {
  background: rgba(0,255,136,0.08);
  color: var(--vuc-green, #00ff88);
}

/* ═══ 11. Page Container ─ 页面通用容器 ═══ */
.vuc-page {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--vuc-space-lg, 24px);
  position: relative;
  z-index: 2;
}

/* ═══ 12. Back to Top ─ 品牌条 / 页脚链接 ═══ */
.vuc-brand-bar {
  text-align: center;
  padding: 40px 0 20px;
  position: relative;
  z-index: 2;
}
.vuc-brand-bar a {
  color: rgba(255,255,255,0.25);
  font-size: 11px;
  text-decoration: none;
  letter-spacing: .1em;
  transition: color .3s;
}
.vuc-brand-bar a:hover { color: var(--vuc-green, #00ff88); }
.vuc-brand-bar span {
  color: var(--vuc-green, #00ff88);
  font-weight: 600;
}

/* ═══ 13. Skeleton ─ 骨架屏 ═══ */
.vuc-skeleton {
  background: linear-gradient(90deg,
    rgba(255,255,255,0.04) 25%,
    rgba(255,255,255,0.08) 50%,
    rgba(255,255,255,0.04) 75%);
  background-size: 200% 100%;
  animation: vuc-shimmer 1.5s infinite;
  border-radius: var(--vuc-radius-md, 12px);
}
.vuc-skeleton--text { height: 16px; margin-bottom: 10px; }
.vuc-skeleton--title { height: 28px; width: 60%; margin-bottom: 16px; }
.vuc-skeleton--card { height: 200px; }
@keyframes vuc-shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ═══ 14. Toast ─ 提示弹窗 ═══ */
.vuc-toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  padding: 12px 24px;
  border-radius: var(--vuc-radius-md, 12px);
  background: var(--vuc-glass-bg, rgba(16,16,32,0.95));
  border: 1px solid var(--vuc-green, #00ff88);
  backdrop-filter: blur(16px);
  color: var(--vuc-green, #00ff88);
  font-size: 14px;
  z-index: 9999;
  animation: vuc-toast-in .3s ease;
}
@keyframes vuc-toast-in {
  from { opacity: 0; transform: translateX(-50%) translateY(20px); }
  to   { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* ═══ 15. Starfield ═══ */
#vuc-stars, .vuc-stars { position: fixed; inset: 0; z-index: 0; pointer-events: none; }
.vuc-star { position: absolute; border-radius: 50%; background: #fff; animation: vuc-star-twinkle 3s ease-in-out infinite; }
@keyframes vuc-star-twinkle { 0%,100% { opacity: .25; transform: scale(1); } 50% { opacity: .9; transform: scale(1.4); } }

/* ═══ 16. Utility: hidden until JS loads ═══ */
.vuc-js-hidden { display: none; }
html.js-loaded .vuc-js-hidden { display: revert; }
html.js-loaded .vuc-nojs-only { display: none; }