* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  padding-bottom: 60px;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.navbar {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
  padding: 20px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 28px;
  font-weight: 700;
  color: #667eea;
}

.search-box {
  display: flex;
  gap: 10px;
}

.search-box input {
  padding: 10px 20px;
  border: 2px solid #e0e0e0;
  border-radius: 25px;
  font-size: 16px;
  width: 320px;
  outline: none;
  transition: all 0.3s;
}

.search-box input:focus {
  border-color: #667eea;
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.search-box button {
  padding: 10px 20px;
  background: #667eea;
  border: none;
  border-radius: 25px;
  cursor: pointer;
  font-size: 18px;
  transition: all 0.3s;
}

.search-box button:hover {
  background: #5568d3;
  transform: translateY(-2px);
}

main {
  margin-top: 28px;
}

.category {
  margin-bottom: 44px;
}

.category-title {
  font-size: 32px;
  color: white;
  margin-bottom: 18px;
  font-weight: 700;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 22px;
}

.card {
  background: white;
  border-radius: 16px;
  padding: 22px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, #667eea, #764ba2);
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
}

.card:hover::before {
  transform: scaleX(1);
}

.card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}

.card-favicon {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  object-fit: contain;
  flex-shrink: 0;
}

.card h3 {
  font-size: 20px;
  color: #333;
  margin: 0;
  font-weight: 600;
  line-height: 1.2;
}

.card p {
  font-size: 14px;
  color: #666;
  margin-bottom: 14px;
  line-height: 1.5;
}

.card-link {
  display: inline-block;
  padding: 8px 22px;
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: white;
  text-decoration: none;
  border-radius: 20px;
  font-weight: 500;
  transition: transform 0.3s, box-shadow 0.3s;
}

.card-link:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

/* 滑动入场特效：每次进入视口都会触发（通过 in-view 类切换） */
.card-anim {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.45s ease, transform 0.45s ease;
  will-change: opacity, transform;
}

.card-anim.in-view {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .card-anim {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

.footer {
  background: rgba(255, 255, 255, 0.95);
  text-align: center;
  padding: 20px;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  box-shadow: 0 -2px 20px rgba(0, 0, 0, 0.1);
}

.footer p {
  color: #666;
  font-size: 14px;
}

@media (max-width: 768px) {
  body { padding-bottom: 80px; }
  .container { padding: 0 12px; }
  .navbar { padding: 12px 0; }
  .navbar .container { flex-direction: column; gap: 12px; }
  .logo { font-size: 22px; }

  .search-box { width: 100%; gap: 8px; }
  .search-box input { width: 100%; padding: 8px 16px; font-size: 14px; }
  .search-box button { padding: 8px 16px; font-size: 16px; }

  main { margin-top: 18px; }
  .category { margin-bottom: 28px; }
  .category-title { font-size: 22px; margin-bottom: 14px; }

  .cards-grid { grid-template-columns: 1fr; gap: 12px; }
  .card { padding: 14px; border-radius: 12px; }
  .card-header { gap: 10px; margin-bottom: 8px; }

  .card-favicon { width: 32px; height: 32px; border-radius: 6px; }
  .card h3 { font-size: 17px; }
  .card p { font-size: 13px; margin-bottom: 12px; line-height: 1.4; }

  .card-link { padding: 6px 18px; font-size: 14px; border-radius: 16px; }
  .footer { padding: 15px; }
  .footer p { font-size: 12px; }
}

@media (max-width: 375px) {
  .card { padding: 12px; }
  .card-favicon { width: 28px; height: 28px; }
  .card h3 { font-size: 16px; }
  .card p { font-size: 12px; margin-bottom: 10px; }
  .card-link { padding: 5px 16px; font-size: 13px; }
}