:root {
  --primary: #4A90D9;
  --secondary: #5BB5A8;
  --bg: #f7f9fc;
  --card-bg: #ffffff;
  --text: #2c3e50;
  --text-light: #7f8c8d;
  --border: #e8eef3;
  --shadow: 0 2px 8px rgba(74, 144, 217, 0.08);
  --shadow-hover: 0 10px 28px rgba(74, 144, 217, 0.18);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.site-header {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  padding: 56px 20px;
  text-align: center;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.site-title {
  font-size: 2.4rem;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: 2px;
}

.site-slogan {
  font-size: 1rem;
  opacity: 0.92;
  font-weight: 300;
}

.main-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px 20px;
}

.category {
  margin-bottom: 60px;
}

.category:last-child {
  margin-bottom: 0;
}

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

.category-icon {
  font-size: 1.8rem;
  line-height: 1;
}

.category-title {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--text);
}

.category-divider {
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--secondary), transparent);
  border: none;
  margin-bottom: 28px;
  border-radius: 2px;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

@media (max-width: 900px) {
  .cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .cards-grid {
    grid-template-columns: 1fr;
  }
  .site-title {
    font-size: 1.8rem;
  }
  .main-content {
    padding: 32px 16px;
  }
}

.card {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 24px;
  box-shadow: var(--shadow);
  transition: transform 0.3s ease, box-shadow 0.3s ease, opacity 0.5s ease;
  display: flex;
  flex-direction: column;
  opacity: 0;
  transform: translateY(20px);
  cursor: pointer;
}

.card.visible {
  opacity: 1;
  transform: translateY(0);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

.card-name {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text);
}

.card-desc {
  font-size: 0.875rem;
  color: var(--text-light);
  margin-bottom: 16px;
  flex-grow: 1;
  line-height: 1.7;
}

.card-tag {
  display: inline-block;
  background: rgba(91, 181, 168, 0.12);
  color: var(--secondary);
  font-size: 0.75rem;
  padding: 4px 12px;
  border-radius: 12px;
  margin-bottom: 18px;
  align-self: flex-start;
  font-weight: 500;
}

.card-btn {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  border: none;
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: opacity 0.2s ease, transform 0.2s ease;
  align-self: flex-start;
}

.card-btn:hover {
  opacity: 0.9;
  transform: scale(1.03);
}

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

.site-footer {
  text-align: center;
  padding: 36px 20px;
  color: var(--text-light);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
  margin-top: 48px;
  background: #fff;
}

.disclaimer {
  margin-bottom: 8px;
  color: var(--primary);
  font-weight: 500;
}

.toast {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.9);
  background: rgba(44, 62, 80, 0.94);
  color: #fff;
  padding: 18px 32px;
  border-radius: 10px;
  font-size: 0.95rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
  z-index: 1000;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  white-space: nowrap;
}

.toast.show {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}