/* ============================================
   首页样式 - Hero、空气质量监控、排行榜、科普文章
   ============================================ */

/* Hero Section */
.hero-section {
    position: relative;
    min-height: calc(100vh - 64px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: var(--space-3xl) var(--space-lg);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: var(--gradient-hero);
    z-index: 0;
}

.hero-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 30% 50%, rgba(255,255,255,0.1) 0%, transparent 50%),
                radial-gradient(circle at 70% 80%, rgba(0,180,216,0.2) 0%, transparent 40%);
}

#particlesCanvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
}

.hero-title {
    font-size: clamp(36px, 8vw, 64px);
    font-weight: 700;
    margin-bottom: var(--space-lg);
    line-height: 1.2;
}

.hero-title .gradient-text {
    background: linear-gradient(135deg, #ffffff 0%, #a5d8ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: clamp(16px, 3vw, 20px);
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--space-2xl);
    font-weight: 300;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-3xl);
    margin-bottom: var(--space-2xl);
    flex-wrap: wrap;
}

.stat-item {
    text-align: center;
    color: white;
}

.stat-item .stat-number {
    display: block;
    font-size: 36px;
    font-weight: 700;
    margin-bottom: var(--space-xs);
}

.stat-item .stat-label {
    font-size: 14px;
    opacity: 0.8;
}

.hero-cta {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    background: white;
    color: var(--primary-600);
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--radius-full);
    font-size: 16px;
    font-weight: 600;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-fast);
    animation: breathe 3s ease-in-out infinite;
}

.hero-cta:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.2);
}

.hero-cta svg {
    width: 20px;
    height: 20px;
    transition: transform var(--transition-fast);
}

.hero-cta:hover svg {
    transform: translateX(4px);
}

.hero-scroll {
    position: absolute;
    bottom: var(--space-xl);
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
}

.scroll-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    color: rgba(255, 255, 255, 0.7);
    font-size: 12px;
}

.scroll-arrow {
    width: 24px;
    height: 24px;
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-top: none;
    border-left: none;
    transform: rotate(45deg);
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% {
        transform: rotate(45deg) translateY(0);
    }
    50% {
        transform: rotate(45deg) translateY(8px);
    }
}

/* 空气质量监控区域 */
.air-quality-section {
    padding: var(--space-3xl) var(--space-lg);
    max-width: 1200px;
    margin: 0 auto;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-xl);
    flex-wrap: wrap;
    gap: var(--space-md);
}

.section-title {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
}

.section-title svg {
    width: 28px;
    height: 28px;
    color: var(--primary-500);
}

.update-time {
    font-size: 13px;
    color: var(--text-tertiary);
}

.location-selector {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.location-label {
    font-size: 14px;
    color: var(--text-secondary);
}

.city-select {
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    font-size: 14px;
    background: var(--bg-card);
    border: 1px solid var(--border-default);
    color: var(--text-primary);
    cursor: pointer;
}

/* 仪表盘网格 */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.metric-card {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: var(--space-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.metric-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.metric-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

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

.metric-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-md);
}

.metric-icon svg {
    width: 24px;
    height: 24px;
}

.aqi-card .metric-icon {
    background: var(--primary-100);
    color: var(--primary-500);
}

.pm25-card .metric-icon {
    background: rgba(0, 180, 120, 0.1);
    color: var(--success);
}

.pm10-card .metric-icon {
    background: rgba(255, 125, 0, 0.1);
    color: var(--warning);
}

.humidity-card .metric-icon {
    background: rgba(22, 119, 255, 0.1);
    color: var(--info);
}

.temp-card .metric-icon {
    background: rgba(245, 63, 63, 0.1);
    color: var(--danger);
}

.wind-card .metric-icon {
    background: rgba(0, 212, 255, 0.1);
    color: #00d4ff;
}

.metric-content {
    display: flex;
    align-items: baseline;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
}

.metric-label {
    display: block;
    font-size: 13px;
    color: var(--text-tertiary);
    margin-bottom: var(--space-xs);
}

.metric-value {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
}

.metric-unit {
    font-size: 14px;
    color: var(--text-secondary);
}

.metric-status {
    display: inline-block;
    padding: 2px 10px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 600;
    margin-left: auto;
}

.metric-status.excellent {
    background: rgba(0, 228, 0, 0.2);
    color: #00b578;
}

.metric-status.good {
    background: rgba(255, 255, 0, 0.2);
    color: #d4b200;
}

.metric-status.moderate {
    background: rgba(255, 126, 0, 0.2);
    color: #ff7d00;
}

.metric-status.unhealthy {
    background: rgba(255, 0, 0, 0.2);
    color: #f53f3f;
}

.metric-trend {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 13px;
    color: var(--danger);
}

.metric-trend.down {
    color: var(--success);
}

.metric-trend svg {
    width: 16px;
    height: 16px;
}

.metric-bar {
    position: relative;
    height: 6px;
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.bar-fill {
    height: 100%;
    border-radius: var(--radius-full);
    transition: width 0.5s ease;
}

.bar-fill {
    background: var(--primary-500);
}

.bar-fill.blue {
    background: var(--info);
}

.bar-fill.orange {
    background: var(--warning);
}

.bar-fill.cyan {
    background: #00d4ff;
}

/* 健康建议 */
.health-advice {
    background: linear-gradient(135deg, var(--primary-50) 0%, rgba(22, 119, 255, 0.05) 100%);
    border: 1px solid var(--primary-200);
    border-radius: var(--radius-xl);
    padding: var(--space-lg);
    display: flex;
    gap: var(--space-md);
    align-items: flex-start;
}

.advice-icon {
    width: 48px;
    height: 48px;
    background: var(--primary-500);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.advice-icon svg {
    width: 24px;
    height: 24px;
    color: white;
}

.advice-content h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.advice-content p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 排行榜区域 */
.ranking-section {
    padding: var(--space-3xl) var(--space-lg);
    max-width: 1200px;
    margin: 0 auto;
    background: var(--bg-secondary);
}

.ranking-tabs {
    display: flex;
    gap: var(--space-sm);
    background: var(--bg-card);
    padding: 4px;
    border-radius: var(--radius-full);
}

.tab-btn {
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-full);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.tab-btn.active {
    background: var(--primary-500);
    color: white;
}

.tab-btn:not(.active):hover {
    color: var(--text-primary);
    background: var(--bg-hover);
}

.ranking-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-xl);
    margin-top: var(--space-xl);
}

.ranking-table-wrapper {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.ranking-table {
    width: 100%;
}

.ranking-table th,
.ranking-table td {
    padding: var(--space-md) var(--space-lg);
    text-align: left;
    font-size: 14px;
}

.ranking-table th {
    background: var(--bg-tertiary);
    font-weight: 600;
    color: var(--text-secondary);
}

.ranking-table tr {
    border-bottom: 1px solid var(--border-light);
    transition: background var(--transition-fast);
}

.ranking-table tr:last-child {
    border-bottom: none;
}

.ranking-table tr:hover {
    background: var(--bg-hover);
}

.ranking-table td {
    color: var(--text-primary);
}

.rank-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 13px;
}

.rank-badge.top3 {
    background: linear-gradient(135deg, #ffd700, #ffaa00);
    color: white;
}

.rank-badge.normal {
    background: var(--bg-secondary);
    color: var(--text-secondary);
}

.aqi-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 600;
}

.aqi-badge.excellent {
    background: rgba(0, 228, 0, 0.15);
    color: #00b578;
}

.aqi-badge.good {
    background: rgba(255, 255, 0, 0.2);
    color: #d4b200;
}

.aqi-badge.moderate {
    background: rgba(255, 126, 0, 0.15);
    color: #ff7d00;
}

.aqi-badge.poor {
    background: rgba(255, 0, 0, 0.15);
    color: #f53f3f;
}

.ranking-chart {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: var(--space-lg);
    box-shadow: var(--shadow-sm);
}

.chart-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
}

.chart-bars {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.chart-bar-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.chart-label {
    width: 60px;
    font-size: 12px;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.chart-bar {
    flex: 1;
    height: 24px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    overflow: hidden;
    position: relative;
}

.chart-fill {
    height: 100%;
    border-radius: var(--radius-md);
    transition: width 0.8s ease;
}

.chart-value {
    width: 40px;
    font-size: 12px;
    color: var(--text-primary);
    font-weight: 500;
    text-align: right;
}

/* 科普文章区域 */
.articles-section {
    padding: var(--space-3xl) var(--space-lg);
    max-width: 1200px;
    margin: 0 auto;
}

.view-all {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    color: var(--primary-500);
    font-size: 14px;
    font-weight: 500;
    transition: gap var(--transition-fast);
}

.view-all:hover {
    gap: var(--space-sm);
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--space-lg);
}

.article-card {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    transition: all var(--transition-fast);
}

.article-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.article-image {
    width: 100%;
    height: 180px;
    object-fit: cover;
    background: var(--bg-secondary);
}

.article-content {
    padding: var(--space-lg);
}

.article-category {
    display: inline-block;
    padding: 2px 10px;
    background: var(--primary-100);
    color: var(--primary-600);
    font-size: 12px;
    font-weight: 500;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-sm);
}

.article-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-excerpt {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--space-md);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    font-size: 12px;
    color: var(--text-tertiary);
}

.article-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* 响应式适配 */
@media (max-width: 1024px) {
    .ranking-content {
        grid-template-columns: 1fr;
    }
    
    .dashboard-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .hero-stats {
        gap: var(--space-xl);
    }
    
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    
    .health-advice {
        flex-direction: column;
        text-align: center;
    }
    
    .advice-icon {
        margin: 0 auto;
    }
    
    .ranking-table th,
    .ranking-table td {
        padding: var(--space-sm);
        font-size: 13px;
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
    }
}