/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #6366f1;
    --secondary-color: #8b5cf6;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --bg-color: #ffffff;
    --bg-light: #f9fafb;
    --border-color: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    color: var(--text-color);
    background-color: var(--bg-light);
    line-height: 1.6;
}

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

/* 导航栏 */
.navbar {
    background: var(--bg-color);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 1rem 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand a {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

.nav-brand a:hover {
    color: var(--secondary-color);
}

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

.nav-menu a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-menu a:hover {
    color: var(--primary-color);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

.nav-menu a:hover::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    gap: 4px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-color);
    transition: var(--transition);
}

/* 主要内容 */
.main-content {
    min-height: calc(100vh - 200px);
}

.page {
    display: none;
}

.page.active {
    display: block;
}

/* Hero区域 */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 80px 0;
    text-align: center;
    margin-bottom: 60px;
}

.hero-title {
    font-size: 3rem;
    margin-bottom: 1rem;
    animation: fadeInUp 0.6s ease;
}

.hero-subtitle {
    font-size: 1.25rem;
    opacity: 0.9;
    animation: fadeInUp 0.8s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 博客网格 */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
    margin-bottom: 60px;
}

.blog-card {
    background: var(--bg-color);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    cursor: pointer;
}

.blog-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.blog-card-image {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 3rem;
}

.blog-card-content {
    padding: 1.5rem;
}

.blog-card-date {
    color: var(--text-light);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.blog-card-title {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-color);
}

.blog-card-excerpt {
    color: var(--text-light);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.blog-card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    background: var(--bg-light);
    color: var(--primary-color);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.875rem;
}

/* 文章详情 */
.back-btn {
    background: var(--bg-color);
    border: 2px solid var(--border-color);
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    margin-bottom: 2rem;
    transition: var(--transition);
}

.back-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.article-detail {
    background: var(--bg-color);
    padding: 3rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    max-width: 800px;
    margin: 0 auto;
}

.article-header {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid var(--border-color);
}

.article-title {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.article-meta {
    display: flex;
    gap: 1.5rem;
    color: var(--text-light);
    font-size: 0.875rem;
}

.article-content {
    line-height: 1.8;
    font-size: 1.1rem;
}

.article-content h2 {
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--text-color);
    font-size: 1.75rem;
}

.article-content h3 {
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-color);
    font-size: 1.5rem;
}

.article-content p {
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

.article-content code {
    background: var(--bg-light);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

.article-content pre {
    background: var(--bg-light);
    padding: 1.5rem;
    border-radius: 8px;
    overflow-x: auto;
    margin-bottom: 1.5rem;
}

.article-content pre code {
    background: none;
    padding: 0;
}

.article-content ul, .article-content ol {
    margin-left: 2rem;
    margin-bottom: 1.5rem;
}

.article-content blockquote {
    border-left: 4px solid var(--primary-color);
    padding-left: 1.5rem;
    margin: 1.5rem 0;
    color: var(--text-light);
    font-style: italic;
}

/* 关于页面 */
.about-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 3rem 0;
}

.about-content h1 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    text-align: center;
}

.about-card {
    background: var(--bg-color);
    padding: 3rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    text-align: center;
}

.avatar {
    margin-bottom: 1.5rem;
}

.avatar-placeholder {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 3rem;
    margin: 0 auto;
}

.about-card h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.about-card p {
    color: var(--text-light);
    font-size: 1.1rem;
    margin-bottom: 2rem;
    line-height: 1.8;
}

.skills {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
}

.skill-tag {
    background: var(--bg-light);
    color: var(--primary-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-weight: 500;
}

/* 联系页面 */
.contact-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 3rem 0;
}

.contact-content h1 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    text-align: center;
}

.contact-card {
    background: var(--bg-color);
    padding: 3rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.contact-item {
    margin-bottom: 2.5rem;
}

.contact-item:last-child {
    margin-bottom: 0;
}

.contact-item h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.contact-item p {
    color: var(--text-light);
    font-size: 1.1rem;
}

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

.social-link {
    background: var(--bg-light);
    color: var(--primary-color);
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
}

.social-link:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.contact-form input,
.contact-form textarea {
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.submit-btn {
    background: var(--primary-color);
    color: white;
    padding: 1rem 2rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.submit-btn:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

/* 页脚 */
.footer {
    background: var(--text-color);
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 60px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: var(--bg-color);
        width: 100%;
        text-align: center;
        transition: var(--transition);
        box-shadow: var(--shadow);
        padding: 2rem 0;
    }

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

    .nav-toggle {
        display: flex;
    }

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

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

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

    .article-detail {
        padding: 1.5rem;
    }

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

    .about-card,
    .contact-card {
        padding: 2rem 1.5rem;
    }
}