/* ==================== 全局样式 ==================== */
:root {
    /* 颜色变量 */
    --primary-color: #10B981; /* 青绿色 */
    --primary-dark: #059669;
    --primary-light: #34D399;
    --text-primary: #1F2937;
    --text-secondary: #6B7280;
    --text-light: #9CA3AF;
    --bg-primary: #FFFFFF;
    --bg-secondary: #F9FAFB;
    --bg-dark: #111827;
    --border-color: #E5E7EB;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);

    /* 字体 */
    --font-heading: "Microsoft YaHei", "微软雅黑", sans-serif;
    --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

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

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

/* ==================== 导航栏 - 磨玻璃效果 ==================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    /* 磨玻璃半透明效果 */
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.9);
    box-shadow: var(--shadow-md);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-heading);
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
}

.logo svg {
    color: var(--primary-color);
}

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

.nav-link {
    display: flex;
    align-items: center;
    gap: 6px;
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 500;
    padding: 8px 12px;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.nav-link svg {
    transition: transform 0.3s ease;
}

.nav-link:hover {
    color: var(--primary-color);
    background: rgba(16, 185, 129, 0.1);
}

.nav-link:hover svg {
    transform: translateX(2px);
}

.nav-link.active {
    color: var(--primary-color);
    background: rgba(16, 185, 129, 0.1);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    color: var(--text-secondary);
    transition: all 0.3s ease;
}

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

/* ==================== 按钮样式 ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 4px 6px rgba(16, 185, 129, 0.2);
}

.btn-primary:hover {
    background: var(--primary-dark);
    box-shadow: 0 6px 12px rgba(16, 185, 129, 0.3);
    transform: translateY(-2px);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-large {
    padding: 14px 28px;
    font-size: 16px;
}

/* ==================== Hero 区域 ==================== */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    /* 背景图片 */
    background-image: url('../images/hero-bg.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    overflow: hidden;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    /* 半透明渐变遮罩 */
    background: linear-gradient(
        135deg,
        rgba(16, 185, 129, 0.3) 0%,
        rgba(5, 150, 105, 0.5) 50%,
        rgba(16, 185, 129, 0.3) 100%
    );
    backdrop-filter: blur(2px);
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: white;
    max-width: 800px;
    padding: 0 20px;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: clamp(36px, 6vw, 64px);
    font-weight: 700;
    margin-bottom: 20px;
    text-shadow: 2px 4px 8px rgba(0, 0, 0, 0.3);
    letter-spacing: 2px;
}

.hero-subtitle {
    font-size: clamp(18px, 2.5vw, 24px);
    margin-bottom: 40px;
    opacity: 0.95;
    text-shadow: 1px 2px 4px rgba(0, 0, 0, 0.2);
}

/* ==================== 文章区域 ==================== */
.articles-section {
    padding: 80px 0;
    background: var(--bg-secondary);
}

.section-title {
    font-family: var(--font-heading);
    font-size: 36px;
    font-weight: 700;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: 50px;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--primary-color);
    margin: 15px auto 0;
    border-radius: 2px;
}

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

/* ==================== 文章卡片 ==================== */
.article-card {
    background: var(--bg-primary);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    cursor: pointer;
}

.article-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.card-image {
    position: relative;
    width: 100%;
    height: 220px;
    overflow: hidden;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

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

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

.card-content {
    padding: 24px;
}

.card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.category {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(16, 185, 129, 0.1);
    color: var(--primary-color);
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.date {
    color: var(--text-light);
    font-size: 13px;
}

.card-title {
    font-family: var(--font-heading);
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-excerpt {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.read-more {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--primary-color);
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.read-more:hover {
    gap: 10px;
    color: var(--primary-dark);
}

/* ==================== 页脚 ==================== */
.footer {
    background: var(--bg-dark);
    color: white;
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    font-family: var(--font-heading);
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--primary-light);
}

.footer-section p {
    color: var(--text-light);
    font-size: 14px;
}

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

.footer-section ul li {
    margin-bottom: 8px;
}

.footer-section ul a {
    color: var(--text-light);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s ease;
}

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

.social-links {
    display: flex;
    gap: 15px;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-light);
    transition: all 0.3s ease;
}

.social-links a:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-3px);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: var(--text-light);
    font-size: 14px;
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }

    .hero-title {
        font-size: 36px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

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

    .section-title {
        font-size: 28px;
    }
}

/* ==================== 暗色模式（可选） ==================== */
body.dark-mode {
    --text-primary: #F9FAFB;
    --text-secondary: #D1D5DB;
    --text-light: #9CA3AF;
    --bg-primary: #1F2937;
    --bg-secondary: #111827;
    --border-color: #374151;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.2);
}

body.dark-mode .navbar {
    background: rgba(17, 24, 39, 0.8);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

body.dark-mode .article-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
}

body.dark-mode .footer {
    background: #0B1221;
}