:root {
    --primary-color: #1a5276;
    --secondary-color: #2980b9;
    --accent-color: #e74c3c;
    --text-color: #2c3e50;
    --bg-color: #f8f9fa;
    --card-bg: #ffffff;
    --border-color: #e1e8ed;
}

* {
    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;
    line-height: 1.8;
    color: var(--text-color);
    background-color: var(--bg-color);
}

header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 60px 20px;
    text-align: center;
}

header h1 {
    font-size: 2.2em;
    margin-bottom: 15px;
    font-weight: 600;
}

header .subtitle {
    font-size: 1.1em;
    opacity: 0.9;
    margin-bottom: 10px;
}

header .meta {
    font-size: 0.9em;
    opacity: 0.8;
    margin-top: 20px;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 40px 20px;
}

.intro {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 10px;
    margin-bottom: 40px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.intro h2 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.4em;
}

.intro p {
    margin-bottom: 12px;
    color: #555;
}

.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin: 30px 0;
}

.stat-card {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--primary-color) 100%);
    color: white;
    padding: 25px;
    border-radius: 10px;
    text-align: center;
}

.stat-card .number {
    font-size: 2.5em;
    font-weight: bold;
    margin-bottom: 5px;
}

.stat-card .label {
    font-size: 0.95em;
    opacity: 0.9;
}

.article-list {
    display: grid;
    gap: 20px;
}

.article-card {
    background: var(--card-bg);
    border-radius: 10px;
    padding: 25px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    border-left: 4px solid var(--secondary-color);
    transition: transform 0.2s, box-shadow 0.2s;
}

.article-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.article-card.featured {
    border-left-color: var(--accent-color);
    background: linear-gradient(to right, #fff5f5 0%, #ffffff 100%);
}

.article-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
}

.article-number {
    background: var(--primary-color);
    color: white;
    width: 35px;
    height: 35px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 0.9em;
}

.article-type {
    background: #e8f4f8;
    color: var(--primary-color);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8em;
}

.article-card h3 {
    color: var(--primary-color);
    font-size: 1.2em;
    margin-bottom: 10px;
}

.article-card .summary {
    color: #666;
    font-size: 0.95em;
    margin-bottom: 15px;
    line-height: 1.6;
}

.article-meta-row {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    font-size: 0.85em;
    color: #888;
}

.article-meta-row span {
    display: flex;
    align-items: center;
    gap: 5px;
}

.read-more {
    display: inline-block;
    margin-top: 15px;
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: 600;
    padding: 8px 0;
}

.read-more:hover {
    color: var(--primary-color);
}

.categories {
    margin: 40px 0;
}

.categories h2 {
    color: var(--primary-color);
    margin-bottom: 20px;
    font-size: 1.4em;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
}

.category-card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.category-card h4 {
    color: var(--secondary-color);
    margin-bottom: 10px;
    font-size: 1em;
}

.category-card ul {
    list-style: none;
    padding: 0;
}

.category-card li {
    padding: 5px 0;
    font-size: 0.9em;
    color: #666;
}

.category-card li::before {
    content: "•";
    color: var(--secondary-color);
    margin-right: 8px;
}

footer {
    text-align: center;
    padding: 40px 20px;
    margin-top: 40px;
    color: #666;
    font-size: 0.9em;
    border-top: 1px solid var(--border-color);
}

footer a {
    color: var(--secondary-color);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}