/* ===== 基础重置 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 明亮主题变量 */
    --primary-color: #4a6cf7;
    --secondary-color: #6c757d;
    --accent-color: #0d6efd;
    --text-color: #333;
    --text-light: #666;
    --bg-color: #ffffff;
    --bg-secondary: #f8f9fa;
    --border-color: #e9ecef;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.1);
    --radius: 8px;
    --transition: all 0.3s ease;
    
    /* 字体 */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SF Mono", Monaco, "Cascadia Mono", "Roboto Mono", monospace;
}

/* 暗色主题 */
[data-theme="dark"] {
    --primary-color: #5d7df7;
    --secondary-color: #adb5bd;
    --accent-color: #3d8bfd;
    --text-color: #e9ecef;
    --text-light: #adb5bd;
    --bg-color: #121212;
    --bg-secondary: #1e1e1e;
    --border-color: #343a40;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.3);
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    transition: var(--transition);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ===== 排版 ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 1rem;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: 1rem;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--accent-color);
}

/* ===== 导航栏 ===== */
.navbar {
    position: sticky;
    top: 0;
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    backdrop-filter: blur(10px);
    background-color: rgba(var(--bg-color-rgb), 0.9);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-color);
}

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

.nav-menu {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: var(--text-light);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.theme-toggle,
.menu-toggle {
    background: none;
    border: none;
    color: var(--text-light);
    cursor: pointer;
    font-size: 1.25rem;
    padding: 0.5rem;
    border-radius: var(--radius);
    transition: var(--transition);
}

.theme-toggle:hover,
.menu-toggle:hover {
    background-color: var(--bg-secondary);
    color: var(--text-color);
}

.menu-toggle {
    display: none;
}

/* ===== 英雄区域 ===== */
.hero-section {
    padding: 6rem 0 4rem;
    text-align: center;
    background: linear-gradient(135deg, var(--bg-color) 0%, var(--bg-secondary) 100%);
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.avatar-container {
    margin-bottom: 2rem;
}

.avatar {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--primary-color);
    box-shadow: var(--shadow-lg);
}

.hero-title {
    font-size: 3rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary-color), #6a11cb);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-light);
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    margin-bottom: 2rem;
}

.badge {
    background-color: var(--bg-secondary);
    color: var(--text-light);
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-size: 0.875rem;
    border: 1px solid var(--border-color);
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    font-weight: 500;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

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

.btn-primary:hover {
    background-color: var(--accent-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn-secondary {
    background-color: var(--bg-secondary);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

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

/* ===== 内容区块 ===== */
section {
    padding: 4rem 0;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
}

.section-title {
    position: relative;
    padding-bottom: 1rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 3rem;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 3px;
}

.section-more {
    color: var(--primary-color);
    font-weight: 500;
}

/* ===== 关于区域 ===== */
.about-content {
    max-width: 800px;
    font-size: 1.125rem;
    line-height: 1.8;
}

.about-content p {
    margin-bottom: 1.5rem;
}

.social-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 2rem;
}

.social-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background-color: var(--bg-secondary);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
}

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

/* ===== 文章网格 ===== */
.articles-grid,
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.article-card,
.project-card {
    background-color: var(--bg-secondary);
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.article-card:hover,
.project-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.card-header {
    padding: 1.5rem 1.5rem 1rem;
}

.card-category {
    display: inline-block;
    color: var(--primary-color);
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.card-title {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.card-title a {
    color: var(--text-color);
}

.card-title a:hover {
    color: var(--primary-color);
}

.card-excerpt {
    color: var(--text-light);
    font-size: 0.9375rem;
    line-height: 1.6;
    margin-bottom: 1rem;
}

.card-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

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

.tag {
    background-color: var(--bg-color);
    color: var(--text-light);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
}

/* ===== 统计区域 ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.stat-card {
    text-align: center;
    padding: 2rem;
    background-color: var(--bg-secondary);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--text-light);
    font-size: 1rem;
}

.site-stat-card .stat-number {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.site-stat-card .stat-number i {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.site-stat-card .stat-label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 0.9375rem;
}

#busuanzi_value_site_pv,
#busuanzi_value_site_uv {
    font-weight: 700;
    min-width: 4rem;
    display: inline-block;
}

/* Busuanzi 加载失败或超时样式 */
.busuanzi-loading {
    opacity: 0.6;
    font-size: 0.875rem;
}

/* ===== 页脚 ===== */
.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: 4rem;
    margin-bottom: 3rem;
}

.footer-info h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.footer-copyright {
    color: var(--text-light);
    font-size: 0.875rem;
    margin-top: 1.5rem;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.link-group h4 {
    font-size: 1rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.link-group a {
    display: block;
    color: var(--text-light);
    margin-bottom: 0.5rem;
    font-size: 0.9375rem;
}

.link-group a:hover {
    color: var(--primary-color);
    padding-left: 0.25rem;
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-light);
    font-size: 0.875rem;
}

.footer-bottom a {
    color: var(--text-light);
}

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

/* ===== 加载动画 ===== */
.loading {
    text-align: center;
    padding: 3rem;
    color: var(--text-light);
    grid-column: 1 / -1;
}

.loading::after {
    content: '';
    display: inline-block;
    width: 1em;
    height: 1em;
    border: 2px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-left: 0.5rem;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .nav-menu {
        display: none;
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background-color: var(--bg-color);
        padding: 1rem;
        flex-direction: column;
        border-bottom: 1px solid var(--border-color);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .articles-grid,
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .hero-badges {
        flex-direction: column;
        align-items: center;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
}