/* 重置和基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
}

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

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid #e5e7eb;
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo a {
    font-size: 1.5rem;
    font-weight: 700;
    color: #1f2937;
    text-decoration: none;
    transition: color 0.3s ease;
}

.nav-logo a:hover {
    color: #3b82f6;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    color: #6b7280;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: #1f2937;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: #3b82f6;
    transition: width 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background: #1f2937;
    margin: 3px 0;
    transition: 0.3s;
}

/* 英雄区域 */
.hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    min-height: 100vh;
    padding: 120px 20px 80px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.hero-content {
    max-width: 500px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    line-height: 1.6;
}

.cta-button {
    display: inline-block;
    background: white;
    color: #667eea;
    padding: 15px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-placeholder {
    width: 300px;
    height: 300px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: rgba(255, 255, 255, 0.8);
}

/* 特色文章区域 */
.featured-posts {
    padding: 80px 0;
    background: #f9fafb;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    color: #1f2937;
}

.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.post-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.post-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.post-card.featured {
    grid-column: span 2;
}

.post-image {
    height: 200px;
    overflow: hidden;
}

.post-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.post-card:hover .post-image img {
    transform: scale(1.05);
}

.post-content {
    padding: 1.5rem;
}

.post-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

.post-category {
    background: #3b82f6;
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-weight: 500;
}

.post-date {
    color: #6b7280;
}

.post-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #1f2937;
    line-height: 1.4;
}

.post-excerpt {
    color: #6b7280;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.read-more {
    color: #3b82f6;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.read-more:hover {
    color: #1d4ed8;
}

/* 关于我区域 */
.about-section {
    padding: 80px 0;
    background: white;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-text h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: #1f2937;
}

.about-text p {
    font-size: 1.125rem;
    color: #6b7280;
    margin-bottom: 2rem;
    line-height: 1.7;
}

.about-link {
    display: inline-block;
    background: #3b82f6;
    color: white;
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

.about-link:hover {
    background: #1d4ed8;
    transform: translateY(-2px);
}

.about-image img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

/* 订阅区域 */
.newsletter {
    padding: 80px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
}

.newsletter-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.newsletter-content p {
    font-size: 1.125rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.newsletter-form {
    display: flex;
    max-width: 500px;
    margin: 0 auto;
    gap: 1rem;
}

.newsletter-form input {
    flex: 1;
    padding: 15px 20px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    outline: none;
}

.newsletter-form button {
    background: white;
    color: #667eea;
    border: none;
    padding: 15px 30px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.newsletter-form button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

/* 页脚 */
.footer {
    background: #1f2937;
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.footer-section p {
    color: #9ca3af;
    line-height: 1.6;
}

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

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: #9ca3af;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: white;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    display: inline-block;
    width: 40px;
    height: 40px;
    background: #374151;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: all 0.3s ease;
}

.social-links a:hover {
    background: #3b82f6;
    transform: translateY(-2px);
}

.footer-bottom {
    border-top: 1px solid #374151;
    padding-top: 2rem;
    text-align: center;
    color: #9ca3af;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: 2rem 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .hero {
        grid-template-columns: 1fr;
        text-align: center;
        padding: 100px 20px 60px;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-placeholder {
        width: 200px;
        height: 200px;
        font-size: 3rem;
    }

    .posts-grid {
        grid-template-columns: 1fr;
    }

    .post-card.featured {
        grid-column: span 1;
    }

    .about-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .newsletter-form {
        flex-direction: column;
    }

    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .about-text h2 {
        font-size: 2rem;
    }

    .newsletter-content h2 {
        font-size: 2rem;
    }
}