* {
    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: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

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

/* Header */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    padding: 30px 0;
}

.logo {
    font-size: 2.5em;
    color: #764ba2;
    margin-bottom: 10px;
    font-weight: 700;
    letter-spacing: 2px;
}

.subtitle {
    color: #666;
    font-size: 1.1em;
    font-style: italic;
    text-align: center;
    margin-top: 15px;
}

/* Navigation */
.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.nav-logo {
    font-size: 2.5em;
    color: #764ba2;
    font-weight: 700;
    letter-spacing: 2px;
    text-decoration: none;
    transition: color 0.3s ease;
}

.nav-logo:hover {
    color: #667eea;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
    margin: 0;
    padding: 0;
}

.nav-link {
    color: #666;
    text-decoration: none;
    font-size: 1.1em;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.nav-link:hover {
    color: #764ba2;
    background: rgba(118, 75, 162, 0.1);
}

.nav-link.active {
    color: #764ba2;
    background: rgba(118, 75, 162, 0.15);
}

/* Main */
.main {
    padding: 40px 0;
}

/* Intro Section */
.intro {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 40px;
    margin-bottom: 40px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.intro h2 {
    color: #764ba2;
    font-size: 2em;
    margin-bottom: 20px;
    text-align: center;
}

.intro p {
    color: #555;
    font-size: 1.1em;
    line-height: 1.8;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

/* Articles Section */
.articles {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 40px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.section-title {
    color: #764ba2;
    font-size: 2em;
    margin-bottom: 30px;
    text-align: center;
    border-bottom: 3px solid #764ba2;
    padding-bottom: 15px;
}

.article-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
}

.article-card {
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(118, 75, 162, 0.3);
}

.article-image {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.placeholder-image {
    color: rgba(255, 255, 255, 0.8);
    font-size: 1.2em;
    font-weight: 500;
}

.article-content {
    padding: 25px;
}

.article-title {
    color: #764ba2;
    font-size: 1.4em;
    margin-bottom: 12px;
    font-weight: 600;
    line-height: 1.3;
}

.article-excerpt {
    color: #666;
    font-size: 0.95em;
    line-height: 1.7;
    margin-bottom: 15px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 15px;
    border-top: 1px solid #eee;
    font-size: 0.85em;
}

.article-date {
    color: #999;
}

.article-category {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 5px 12px;
    border-radius: 15px;
    font-size: 0.85em;
    font-weight: 500;
}

/* Footer */
.footer {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 25px 0;
    text-align: center;
    color: #666;
    margin-top: 40px;
}

.footer p {
    font-size: 0.9em;
}

/* About Page */
.about-content {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 40px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.about-section {
    margin-bottom: 40px;
}

.about-section:last-child {
    margin-bottom: 0;
}

.about-section h3 {
    color: #764ba2;
    font-size: 1.6em;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #eee;
}

.about-section p {
    color: #555;
    font-size: 1.05em;
    line-height: 1.8;
    margin-bottom: 15px;
}

.about-list {
    list-style: none;
    padding-left: 0;
    margin-top: 15px;
}

.about-list li {
    color: #555;
    font-size: 1.05em;
    line-height: 1.8;
    padding: 10px 0;
    padding-left: 30px;
    position: relative;
}

.about-list li::before {
    content: "✦";
    position: absolute;
    left: 0;
    color: #764ba2;
    font-size: 1.2em;
}

.contact-info {
    color: #764ba2;
    font-weight: 500;
    margin-top: 10px;
}

/* Responsive */
@media (max-width: 768px) {
    .header {
        padding: 20px 0;
    }

    .nav {
        flex-direction: column;
        gap: 20px;
    }

    .nav-logo {
        font-size: 2em;
    }

    .nav-menu {
        gap: 15px;
        flex-wrap: wrap;
        justify-content: center;
    }

    .nav-link {
        font-size: 1em;
        padding: 6px 12px;
    }

    .logo {
        font-size: 2em;
    }

    .subtitle {
        font-size: 1em;
    }

    .intro {
        padding: 25px;
    }

    .intro h2 {
        font-size: 1.6em;
    }

    .intro p {
        font-size: 1em;
    }

    .articles {
        padding: 25px;
    }

    .section-title {
        font-size: 1.6em;
    }

    .article-list {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .article-title {
        font-size: 1.2em;
    }

    .about-content {
        padding: 25px;
    }

    .about-section h3 {
        font-size: 1.4em;
    }

    .about-section p,
    .about-list li {
        font-size: 1em;
    }
}