/* ============================================
   Free AI Hub - 主样式
   ============================================ */

/* CSS 变量 - 暗色主题（默认） */
:root {
  --bg-primary: #0a0e1a;
  --bg-secondary: #111627;
  --bg-card: #161c33;
  --bg-card-hover: #1c2340;
  --bg-nav: rgba(10, 14, 26, 0.85);
  --border-color: rgba(99, 102, 241, 0.15);
  --border-hover: rgba(99, 102, 241, 0.4);
  --text-primary: #e8eaf0;
  --text-secondary: #8b8fa3;
  --text-muted: #5c6072;
  --accent: #6366f1;
  --accent-light: #818cf8;
  --accent-glow: rgba(99, 102, 241, 0.15);
  --green: #22c55e;
  --yellow: #eab308;
  --red: #ef4444;
  --blue: #3b82f6;
  --cyan: #06b6d4;
  --purple: #a855f7;
  --pink: #ec4899;
  --orange: #f97316;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.4);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 亮色主题 */
[data-theme="light"] {
  --bg-primary: #f5f7fb;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f0f2f8;
  --bg-nav: rgba(255, 255, 255, 0.85);
  --border-color: rgba(99, 102, 241, 0.1);
  --border-hover: rgba(99, 102, 241, 0.3);
  --text-primary: #1a1d2e;
  --text-secondary: #5c6072;
  --text-muted: #9ca3af;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.1);
  --accent-glow: rgba(99, 102, 241, 0.08);
}

/* 全局重置 */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
}

a {
  color: inherit;
  text-decoration: none;
}

/* ============================================
   导航栏
   ============================================ */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-nav);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  transition: background var(--transition);
}

.navbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent-light);
  cursor: pointer;
  user-select: none;
}

.navbar-brand .logo-icon {
  font-size: 1.5rem;
}

.navbar-brand .badge {
  font-size: 0.6rem;
  background: var(--accent);
  color: white;
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 600;
  margin-left: 4px;
  letter-spacing: 0.5px;
}

.navbar-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.theme-toggle {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: all var(--transition);
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent-light);
  background: var(--bg-card-hover);
}

/* ============================================
   Hero 区域
   ============================================ */
.hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: 60px 20px 40px;
  text-align: center;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--accent-light), var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 32px;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.stat-number {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-light);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ============================================
   搜索和筛选
   ============================================ */
.controls {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px 24px;
}

.search-bar {
  position: relative;
  max-width: 500px;
  margin: 0 auto 20px;
}

.search-bar input {
  width: 100%;
  padding: 12px 16px 12px 44px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 0.95rem;
  outline: none;
  transition: all var(--transition);
}

.search-bar input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.search-bar input::placeholder {
  color: var(--text-muted);
}

.search-bar .search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 1.1rem;
}

/* 分类 Tabs */
.category-tabs {
  display: flex;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
}

.category-tab {
  padding: 8px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all var(--transition);
  user-select: none;
}

.category-tab:hover {
  border-color: var(--accent);
  color: var(--accent-light);
}

.category-tab.active {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

/* ============================================
   资源卡片网格
   ============================================ */
.resources-grid {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px 60px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 20px;
}

.resource-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 24px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
  cursor: default;
}

.resource-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

.resource-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-lg);
  background: var(--bg-card-hover);
}

.resource-card:hover::before {
  opacity: 1;
}

/* 状态指示器 */
.status-indicator {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.78rem;
  padding: 3px 10px;
  border-radius: 12px;
  margin-bottom: 12px;
}

.status-indicator.active {
  background: rgba(34, 197, 94, 0.12);
  color: var(--green);
}

.status-indicator.inactive {
  background: rgba(239, 68, 68, 0.12);
  color: var(--red);
}

.status-indicator.warning {
  background: rgba(234, 179, 8, 0.12);
  color: var(--yellow);
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  display: inline-block;
}

.status-dot.active {
  background: var(--green);
  box-shadow: 0 0 8px rgba(34, 197, 94, 0.5);
}

.status-dot.inactive {
  background: var(--red);
}

.status-dot.warning {
  background: var(--yellow);
}

/* 卡片头部 */
.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.card-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.3;
}

/* 分类 Badge */
.category-badge {
  font-size: 0.7rem;
  padding: 3px 10px;
  border-radius: 12px;
  font-weight: 600;
  white-space: nowrap;
  flex-shrink: 0;
  margin-top: 2px;
}

.category-badge.api {
  background: rgba(59, 130, 246, 0.12);
  color: var(--blue);
}

.category-badge.compute {
  background: rgba(6, 182, 212, 0.12);
  color: var(--cyan);
}

.category-badge.tutorial {
  background: rgba(168, 85, 247, 0.12);
  color: var(--purple);
}

.category-badge.tools {
  background: rgba(249, 115, 22, 0.12);
  color: var(--orange);
}

/* 描述 */
.card-description {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 免费额度 */
.quota-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: var(--accent-glow);
  color: var(--accent-light);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 8px;
  margin-bottom: 14px;
}

.quota-badge::before {
  content: '🎯';
  font-size: 0.85rem;
}

/* 标签列表 */
.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}

.tag {
  font-size: 0.75rem;
  padding: 3px 10px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  color: var(--text-muted);
  transition: all var(--transition);
}

.tag:hover {
  border-color: var(--accent);
  color: var(--accent-light);
}

/* 卡片底部 */
.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px solid var(--border-color);
}

.verified-time {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 4px;
}

.visit-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  background: var(--accent);
  color: white;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
}

.visit-btn:hover {
  background: var(--accent-light);
  transform: scale(1.04);
}

.visit-btn:active {
  transform: scale(0.97);
}

/* 热门标记 */
.popular-badge {
  position: absolute;
  top: 12px;
  right: 12px;
  background: linear-gradient(135deg, var(--orange), var(--pink));
  color: white;
  font-size: 0.68rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 10px;
  letter-spacing: 0.5px;
}

/* 弹出消息 */
.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--accent);
  color: white;
  padding: 10px 24px;
  border-radius: var(--radius);
  font-size: 0.9rem;
  opacity: 0;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 200;
  pointer-events: none;
  box-shadow: var(--shadow-lg);
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ============================================
   推广区
   ============================================ */
.promo-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px 40px;
}

.promo-section h3 {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 16px;
  text-align: center;
}

.promo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 16px;
}

.promo-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 18px 20px;
  display: flex;
  align-items: center;
  gap: 14px;
  transition: all var(--transition);
}

.promo-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.promo-icon {
  font-size: 1.8rem;
  flex-shrink: 0;
}

.promo-info h4 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 2px;
}

.promo-info p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ============================================
   页脚
   ============================================ */
.footer {
  border-top: 1px solid var(--border-color);
  padding: 30px 20px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer a {
  color: var(--accent-light);
  transition: color var(--transition);
}

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

.footer-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

/* ============================================
   空状态
   ============================================ */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
  grid-column: 1 / -1;
}

.empty-state .empty-icon {
  font-size: 3rem;
  margin-bottom: 16px;
}

/* ============================================
   响应式
   ============================================ */
@media (max-width: 768px) {
  .hero {
    padding: 40px 16px 30px;
  }

  .hero h1 {
    font-size: 1.8rem;
  }

  .hero-stats {
    gap: 24px;
  }

  .resources-grid {
    grid-template-columns: 1fr;
    padding: 0 16px 40px;
    gap: 16px;
  }

  .resource-card {
    padding: 18px;
  }

  .navbar-inner {
    padding: 0 16px;
  }

  .controls {
    padding: 0 16px 16px;
  }

  .category-tabs {
    gap: 6px;
  }

  .category-tab {
    padding: 6px 14px;
    font-size: 0.82rem;
  }

  .promo-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .resource-card .card-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .card-footer {
    flex-direction: column;
    gap: 10px;
    align-items: flex-start;
  }

  .stat-number {
    font-size: 1.2rem;
  }
}