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

:root {
    --primary-color: #10B981;
    --primary-light: #34D399;
    --primary-dark: #059669;
    --secondary-color: #1F2937;
    --secondary-light: #374151;
    --secondary-dark: #111827;
    --accent-color: #F59E0B;
    --text-primary: #FFFFFF;
    --text-secondary: #D1D5DB;
    --text-muted: #9CA3AF;
    --bg-gradient: linear-gradient(135deg, #111827 0%, #1F2937 50%, #111827 100%);
    --card-bg: rgba(31, 41, 55, 0.8);
    --border-color: rgba(16, 185, 129, 0.3);
}

body {
    font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg-gradient);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

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

header {
    background: rgba(17, 24, 39, 0.95);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 2px solid var(--primary-color);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.logo h1 {
    font-size: 28px;
    background: linear-gradient(90deg, var(--primary-light), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo .tagline {
    font-size: 12px;
    color: var(--text-muted);
    display: block;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 25px;
}

nav ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    padding: 8px 15px;
    border-radius: 5px;
}

nav ul li a:hover,
nav ul li.active a {
    color: var(--primary-color);
    background: rgba(16, 185, 129, 0.1);
}

.header-actions .btn {
    margin-left: 15px;
}

.btn {
    padding: 12px 28px;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    display: inline-block;
    border: none;
    cursor: pointer;
    font-size: 15px;
}

.btn.primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--text-primary);
}

.btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(16, 185, 129, 0.4);
}

.hero {
    position: relative;
    padding: 80px 0;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(245, 158, 11, 0.05));
}

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

.hero-content h2 {
    font-size: 42px;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.hero-content p {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 50px;
    flex-wrap: wrap;
}

.stat {
    text-align: center;
}

.stat .number {
    font-size: 36px;
    font-weight: 700;
    color: var(--accent-color);
    display: block;
}

.stat .label {
    font-size: 14px;
    color: var(--text-muted);
    margin-top: 5px;
}

.quick-links {
    padding: 40px 0;
    border-bottom: 1px solid var(--border-color);
}

.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 20px;
}

.link-card {
    background: var(--card-bg);
    padding: 25px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    text-align: center;
    text-decoration: none;
    transition: all 0.3s ease;
}

.link-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: 0 10px 30px rgba(16, 185, 129, 0.2);
}

.link-icon {
    font-size: 32px;
    display: block;
    margin-bottom: 10px;
}

.link-text {
    color: var(--text-primary);
    font-size: 15px;
    font-weight: 600;
}

.featured-content {
    padding: 50px 0;
}

.featured-content h3,
.content-categories h3,
.latest-news h3,
.trending-topics h3 {
    font-size: 26px;
    margin-bottom: 25px;
    color: var(--primary-color);
    padding-left: 15px;
    border-left: 4px solid var(--primary-color);
}

.featured-grid {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 30px;
}

.featured-main {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.featured-image {
    height: 300px;
    background: linear-gradient(135deg, var(--primary-dark), var(--secondary-dark));
}

.featured-info {
    padding: 30px;
}

.category {
    background: var(--primary-color);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    margin-bottom: 15px;
    display: inline-block;
}

.featured-info h4 {
    font-size: 24px;
    color: var(--text-primary);
    margin-bottom: 15px;
    line-height: 1.4;
}

.featured-info p {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.7;
    margin-bottom: 20px;
}

.meta {
    display: flex;
    gap: 20px;
}

.meta span {
    color: var(--text-muted);
    font-size: 14px;
}

.featured-side {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.side-item {
    display: flex;
    gap: 15px;
    background: var(--card-bg);
    padding: 20px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.side-item:hover {
    border-color: var(--primary-color);
}

.side-image {
    width: 100px;
    height: 70px;
    background: linear-gradient(135deg, var(--secondary-light), var(--secondary-dark));
    border-radius: 8px;
    flex-shrink: 0;
}

.side-info h5 {
    color: var(--text-primary);
    font-size: 16px;
    margin-bottom: 8px;
}

.side-info .time {
    color: var(--text-muted);
    font-size: 13px;
}

.content-categories {
    padding: 40px 0;
    border-top: 1px solid var(--border-color);
}

.categories-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.category-item {
    display: flex;
    align-items: center;
    gap: 15px;
    background: var(--card-bg);
    padding: 20px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.cat-icon {
    font-size: 28px;
}

.cat-name {
    flex: 1;
    color: var(--text-primary);
    font-size: 16px;
    font-weight: 600;
}

.cat-count {
    color: var(--text-muted);
    font-size: 14px;
}

.latest-news {
    padding: 40px 0;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
}

.section-header a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.news-card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.news-card {
    background: var(--card-bg);
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.news-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
}

.news-card .news-image {
    width: 100%;
    height: 180px;
    background: linear-gradient(135deg, var(--secondary-light), var(--secondary-dark));
}

.news-content {
    padding: 20px;
}

.news-content h4 {
    color: var(--text-primary);
    margin-bottom: 10px;
    font-size: 18px;
}

.news-content p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 10px;
}

.news-content .time {
    color: var(--text-muted);
    font-size: 13px;
}

.trending-topics {
    padding: 40px 0;
    background: var(--secondary-dark);
}

.topics-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.topic-item {
    display: flex;
    align-items: center;
    gap: 20px;
    background: var(--card-bg);
    padding: 20px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.topic-rank {
    width: 35px;
    height: 35px;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    font-size: 16px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
}

.topic-item:nth-child(1) .topic-rank { background: #EF4444; }
.topic-item:nth-child(2) .topic-rank { background: #F97316; }
.topic-item:nth-child(3) .topic-rank { background: #F59E0B; color: #111827; }

.topic-tag {
    flex: 1;
    color: var(--text-primary);
    font-size: 16px;
}

.topic-trend {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 14px;
}

.subscribe-section {
    padding: 50px 0;
    text-align: center;
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.15), rgba(245, 158, 11, 0.1));
    margin: 30px 0;
    border-radius: 12px;
}

.subscribe-section h3 {
    border: none;
    padding: 0;
    color: var(--text-primary);
}

.subscribe-section p {
    color: var(--text-secondary);
    margin-bottom: 25px;
}

.subscribe-form {
    display: flex;
    gap: 10px;
    max-width: 500px;
    margin: 0 auto;
}

.subscribe-form input {
    flex: 1;
    padding: 14px 20px;
    border-radius: 8px;
    border: 1px solid var(--secondary-light);
    background: var(--secondary-dark);
    color: var(--text-primary);
    font-size: 15px;
}

.subscribe-form button {
    padding: 14px 30px;
}

.page-hero {
    padding: 50px 0;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.page-hero h2 {
    font-size: 32px;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.page-hero p {
    color: var(--text-muted);
}

.hot-content {
    padding: 40px 0;
}

.hot-ranking h3,
.hot-topics h3 {
    font-size: 24px;
    margin-bottom: 25px;
    color: var(--primary-color);
}

.ranking-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.ranking-item {
    display: flex;
    gap: 20px;
    background: var(--card-bg);
    padding: 25px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.ranking-item:hover {
    border-color: var(--primary-color);
}

.ranking-item.top {
    border-color: var(--accent-color);
    background: rgba(245, 158, 11, 0.1);
}

.rank {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    background: var(--secondary-light);
    color: var(--text-secondary);
    font-size: 20px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.ranking-item.top .rank {
    background: var(--accent-color);
    color: #111827;
}

.item-content h4 {
    color: var(--text-primary);
    margin-bottom: 10px;
    font-size: 18px;
}

.item-content p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 15px;
    line-height: 1.6;
}

.item-meta {
    display: flex;
    gap: 20px;
}

.item-meta span {
    color: var(--text-muted);
    font-size: 13px;
}

.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

.topic-card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    text-align: center;
}

.topic-card .topic-tag {
    color: var(--primary-color);
    font-size: 15px;
    display: block;
    margin-bottom: 8px;
}

.topic-card .topic-count {
    color: var(--text-muted);
    font-size: 13px;
}

.tips-content {
    padding: 40px 0;
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin-bottom: 40px;
}

.tip-card {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.tip-icon {
    font-size: 42px;
    margin-bottom: 15px;
}

.tip-card h3 {
    color: var(--primary-color);
    margin-bottom: 20px;
    font-size: 20px;
}

.tip-card ul {
    padding-left: 20px;
}

.tip-card li {
    color: var(--text-secondary);
    margin-bottom: 10px;
    font-size: 14px;
}

.advanced-tips h3 {
    font-size: 24px;
    color: var(--primary-color);
    margin-bottom: 25px;
}

.advanced-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.advanced-card {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.advanced-card h4 {
    color: var(--text-primary);
    margin-bottom: 15px;
    font-size: 18px;
}

.advanced-card p {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.7;
}

.reading-content {
    padding: 40px 0;
}

.featured-article {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    margin-bottom: 30px;
}

.article-image {
    height: 300px;
    background: linear-gradient(135deg, var(--primary-dark), var(--secondary-dark));
}

.article-content {
    padding: 30px;
}

.article-content h3 {
    color: var(--text-primary);
    font-size: 24px;
    margin-bottom: 20px;
}

.article-content p {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.8;
    margin-bottom: 15px;
}

.reading-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.reading-card {
    background: var(--card-bg);
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.reading-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
}

.card-image {
    height: 150px;
    background: linear-gradient(135deg, var(--secondary-light), var(--secondary-dark));
}

.card-content {
    padding: 20px;
}

.card-content h4 {
    color: var(--text-primary);
    margin-bottom: 10px;
    font-size: 18px;
}

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

.latest-content {
    padding: 40px 0;
}

.filter-bar {
    display: flex;
    gap: 10px;
    margin-bottom: 25px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 10px 20px;
    background: var(--secondary-light);
    color: var(--text-secondary);
    border: none;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 14px;
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--primary-color);
    color: white;
}

.latest-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.latest-item {
    display: flex;
    gap: 20px;
    background: var(--card-bg);
    padding: 25px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.item-time {
    width: 100px;
    text-align: center;
    padding: 10px;
    background: var(--primary-color);
    color: white;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    flex-shrink: 0;
}

.item-content h3 {
    color: var(--text-primary);
    margin-bottom: 10px;
    font-size: 18px;
}

.item-content p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 15px;
    line-height: 1.6;
}

.pagination {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 40px;
}

.page-btn {
    padding: 10px 18px;
    background: var(--secondary-light);
    color: var(--text-secondary);
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.page-btn:hover,
.page-btn.active {
    background: var(--primary-color);
    color: white;
}

.qa-content {
    padding: 40px 0;
}

.faq-section h3,
.ask-section h3,
.recent-questions h3 {
    font-size: 24px;
    color: var(--primary-color);
    margin-bottom: 25px;
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.faq-item {
    background: var(--card-bg);
    padding: 25px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.faq-item h4 {
    color: var(--text-primary);
    margin-bottom: 10px;
    font-size: 18px;
}

.faq-item p {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.6;
}

.ask-form {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    color: var(--text-secondary);
    margin-bottom: 8px;
    font-size: 14px;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px;
    border-radius: 8px;
    border: 1px solid var(--secondary-light);
    background: var(--secondary-dark);
    color: var(--text-primary);
    font-size: 15px;
}

.form-group textarea {
    height: 100px;
    resize: vertical;
}

.recent-questions {
    margin-top: 40px;
}

.questions-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.question-item {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.question-item h4 {
    color: var(--text-primary);
    margin-bottom: 8px;
    font-size: 16px;
}

.question-item .author {
    color: var(--text-muted);
    font-size: 13px;
    margin-bottom: 10px;
    display: block;
}

.question-item .answer {
    color: var(--secondary-color);
    font-size: 14px;
}

footer {
    background: var(--secondary-dark);
    padding: 40px 0;
    border-top: 2px solid var(--primary-color);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    margin-bottom: 30px;
}

.footer-brand h4 {
    font-size: 20px;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.footer-brand p {
    color: var(--text-muted);
    font-size: 14px;
}

.footer-links h5 {
    color: var(--text-primary);
    margin-bottom: 15px;
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s ease;
}

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

.footer-contact h5 {
    color: var(--text-primary);
    margin-bottom: 15px;
}

.footer-contact p {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 8px;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 13px;
}

@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        gap: 15px;
    }
    
    nav ul {
        flex-wrap: wrap;
        justify-content: center;
        gap: 10px;
    }
    
    .hero-content h2 {
        font-size: 32px;
    }
    
    .hero-stats {
        gap: 30px;
    }
    
    .featured-grid {
        grid-template-columns: 1fr;
    }
    
    .side-item {
        flex-direction: column;
    }
    
    .side-image {
        width: 100%;
        height: 150px;
    }
    
    .latest-item {
        flex-direction: column;
    }
    
    .item-time {
        width: 100%;
        text-align: left;
    }
}