/* ===== CSS 变量与公共样式 ===== */
:root {
  /* 主色调 */
  --primary: #4facfe;
  --primary-dark: #00f2fe;
  --accent: #ff6b6b;
  --accent-warm: #ffa726;
  --success: #43e97b;
  --warning: #f9d423;

  /* 背景 */
  --bg-dark: #0a0e27;
  --bg-card: rgba(255, 255, 255, 0.08);
  --bg-glass: rgba(255, 255, 255, 0.12);
  --bg-glass-strong: rgba(255, 255, 255, 0.18);

  /* 文字 */
  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.75);
  --text-muted: rgba(255, 255, 255, 0.5);

  /* 边框 */
  --border-glass: rgba(255, 255, 255, 0.15);
  --border-active: rgba(255, 255, 255, 0.3);

  /* 阴影 */
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 20px rgba(79, 172, 254, 0.3);

  /* 圆角 */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  /* 动画 */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.35s ease;
  --transition-slow: 0.6s ease;
}

/* ===== 玻璃态卡片 ===== */
.glass {
  background: var(--bg-glass);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
}

.glass-strong {
  background: var(--bg-glass-strong);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border: 1px solid var(--border-active);
  border-radius: var(--radius-lg);
}

/* ===== 渐变文字 ===== */
.gradient-text {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 24px;
  border-radius: 50px;
  font-weight: 500;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 28px rgba(79, 172, 254, 0.5);
}

.btn-glass {
  background: var(--bg-glass);
  color: var(--text-primary);
  border: 1px solid var(--border-glass);
}

.btn-glass:hover,
.btn-glass.active {
  background: var(--bg-glass-strong);
  border-color: var(--border-active);
}

/* ===== 标签 ===== */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 500;
  background: var(--bg-glass);
  color: var(--text-secondary);
}

.tag--outdoor {
  background: rgba(67, 233, 123, 0.2);
  color: var(--success);
}

.tag--indoor {
  background: rgba(79, 172, 254, 0.2);
  color: var(--primary);
}

/* ===== 滚动条 ===== */
::-webkit-scrollbar {
  width: 4px;
  height: 4px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 2px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.3);
}

/* ===== 加载动画 ===== */
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.skeleton {
  animation: pulse 1.5s ease-in-out infinite;
  background: var(--bg-glass);
  border-radius: var(--radius-sm);
}

/* ===== 响应式布局 ===== */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

@media (max-width: 768px) {
  :root {
    --radius-md: 12px;
    --radius-lg: 20px;
  }

  .container {
    padding: 0 16px;
  }
}