/* ==================== 全局样式 ==================== */
:root {
    /* 主色调 - 柔和渐变色系 */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --green-gradient: linear-gradient(135deg, #84fab0 0%, #8fd3f4 100%);
    --blue-gradient: linear-gradient(135deg, #a1c4fd 0%, #c2e9fb 100%);
    --warm-gradient: linear-gradient(135deg, #ffecd2 0%, #fcb69f 100%);
    
    /* 颜色变量 */
    --bg-color: #f5f7fa;
    --card-bg: #ffffff;
    --text-primary: #2d3748;
    --text-secondary: #718096;
    --text-muted: #a0aec0;
    --border-color: #e2e8f0;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    
    /* 强调色 */
    --accent-blue: #667eea;
    --accent-green: #48bb78;
    --accent-orange: #ed8936;
    --accent-purple: #9f7aea;
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    display: grid;
    grid-template-columns: 260px 1fr 320px;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    min-height: 100vh;
}

/* ==================== 卡片基础样式 ==================== */
.card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

/* ==================== 左侧导航栏 ==================== */
.sidebar {
    position: sticky;
    top: var(--spacing-lg);
    height: fit-content;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.sidebar-header {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent-blue);
}

.logo i {
    font-size: 1.5rem;
}

.sidebar-nav {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
}

.nav-section {
    margin-bottom: var(--spacing-lg);
}

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

.nav-section h3 {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-sm);
    padding: 0 var(--spacing-sm);
}

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

.nav-section li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.nav-section li:hover {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    color: var(--accent-blue);
}

.nav-section li.active {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.nav-section li i {
    font-size: 1.1rem;
    width: 20px;
    text-align: center;
}

/* 社交链接特殊样式 */
.nav-section li.social-nav-link {
    cursor: pointer;
    position: relative;
}

.nav-section li.social-nav-link::after {
    content: '扫码';
    position: absolute;
    right: var(--spacing-sm);
    font-size: 0.7rem;
    padding: 2px 6px;
    background: var(--accent-green);
    color: white;
    border-radius: 10px;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.nav-section li.social-nav-link:hover::after {
    opacity: 1;
}

.sidebar-footer {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
}

.write-btn {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--green-gradient);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(132, 250, 176, 0.3);
}

.write-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(132, 250, 176, 0.4);
}

/* ==================== 主内容区 ==================== */
.main-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    max-width: 900px;
}

/* 欢迎卡片 */
.welcome-card {
    background: var(--blue-gradient);
    color: white;
    padding: var(--spacing-xl);
}

.welcome-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-lg);
}

.avatar-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    flex: 1;
}

.avatar {
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.welcome-text h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.95;
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

.description {
    font-size: 0.95rem;
    opacity: 0.9;
    line-height: 1.7;
    max-width: 500px;
}

.welcome-illustration {
    font-size: 6rem;
    opacity: 0.2;
}

/* 文章列表 */
.articles-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 var(--spacing-xs);
}

.section-header h2 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
}

.article-count {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
    gap: var(--spacing-lg);
}

.article-card {
    padding: var(--spacing-lg);
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.3s ease;
}

.article-card:hover {
    border-color: var(--accent-blue);
    box-shadow: var(--shadow-lg);
}

.article-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.article-meta .date {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.article-meta .tag {
    padding: 0.25rem 0.75rem;
    background: var(--blue-gradient);
    color: white;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.article-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    line-height: 1.4;
}

.article-excerpt {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
    font-size: 0.95rem;
}

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

.read-time {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-muted);
    font-size: 0.85rem;
}

.read-more {
    color: var(--accent-blue);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s ease;
}

.read-more:hover {
    color: var(--accent-purple);
    transform: translateX(4px);
}

/* ==================== 右侧边栏 ==================== */
.right-sidebar {
    position: sticky;
    top: var(--spacing-lg);
    height: fit-content;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* 时钟卡片 */
.clock-card {
    background: var(--primary-gradient);
    color: white;
    text-align: center;
    padding: var(--spacing-xl);
}

.clock-display .time {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    font-variant-numeric: tabular-nums;
}

.clock-display .date {
    font-size: 1rem;
    opacity: 0.9;
}

/* 日历卡片 */
.calendar-card {
    padding: var(--spacing-lg);
}

.calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.calendar-title {
    font-weight: 600;
    color: var(--text-primary);
}

.calendar-nav {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
}

.calendar-nav:hover {
    background: var(--bg-color);
    color: var(--accent-blue);
}

.calendar-body {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: var(--spacing-xs);
}

.calendar-day {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.calendar-day.header {
    font-weight: 600;
    color: var(--text-muted);
    cursor: default;
}

.calendar-day.other-month {
    color: var(--text-muted);
    opacity: 0.5;
}

.calendar-day:not(.header):not(.other-month):hover {
    background: var(--bg-color);
    color: var(--accent-blue);
}

.calendar-day.today {
    background: var(--accent-blue);
    color: white;
    font-weight: 600;
}

/* 工具卡片 */
.tools-card h3,
.recommend-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.social-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.social-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: all 0.3s ease;
    background: var(--bg-color);
}

.social-link:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-sm);
}

.social-link.wechat {
    background: linear-gradient(135deg, rgba(132, 250, 176, 0.1) 0%, rgba(143, 211, 244, 0.1) 100%);
}

.social-link.wechat:hover {
    background: linear-gradient(135deg, rgba(132, 250, 176, 0.2) 0%, rgba(143, 211, 244, 0.2) 100%);
}

.social-link.xiaohongshu {
    background: linear-gradient(135deg, rgba(255, 236, 210, 0.3) 0%, rgba(252, 182, 159, 0.3) 100%);
}

.social-link.xiaohongshu:hover {
    background: linear-gradient(135deg, rgba(255, 236, 210, 0.5) 0%, rgba(252, 182, 159, 0.5) 100%);
}

.social-link i {
    font-size: 1.75rem;
    color: var(--accent-green);
}

.social-link.xiaohongshu i {
    color: var(--accent-orange);
}

.social-info {
    display: flex;
    flex-direction: column;
}

.social-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.social-desc {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* 推荐工具 */
.tool-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.tool-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
}

.tool-list li:hover {
    background: var(--primary-gradient);
    color: white;
    transform: translateX(4px);
}

.tool-list li i {
    font-size: 1.25rem;
    color: var(--accent-purple);
}

.tool-list li:hover i {
    color: white;
}

/* ==================== 二维码弹窗 ==================== */
.qr-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    animation: fadeIn 0.3s ease;
}

.qr-modal.active {
    display: flex;
    justify-content: center;
    align-items: center;
}

.qr-modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
}

.qr-modal-content {
    position: relative;
    background: var(--card-bg);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    max-width: 400px;
    width: 90%;
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.qr-modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: 36px;
    height: 36px;
    border: none;
    background: var(--bg-color);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all 0.2s ease;
}

.qr-modal-close:hover {
    background: var(--accent-blue);
    color: white;
    transform: rotate(90deg);
}

.qr-modal-body {
    text-align: center;
}

.qr-modal-body h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.qr-modal-body img {
    width: 280px;
    height: 280px;
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-md);
}

.qr-modal-body p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* 头像样式优化 */
.avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 1400px) {
    body {
        grid-template-columns: 240px 1fr 280px;
        gap: var(--spacing-md);
        padding: var(--spacing-md);
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 1024px) {
    body {
        grid-template-columns: 1fr;
        padding: var(--spacing-sm);
    }
    
    .sidebar,
    .right-sidebar {
        display: none;
    }
    
    .main-content {
        max-width: 100%;
    }
    
    .welcome-content {
        flex-direction: column;
        text-align: center;
    }
    
    .avatar-section {
        flex-direction: column;
        text-align: center;
    }
    
    .welcome-illustration {
        display: none;
    }
}

@media (max-width: 640px) {
    .articles-grid {
        grid-template-columns: 1fr;
    }
    
    .welcome-card {
        padding: var(--spacing-lg);
    }
    
    .welcome-text h1 {
        font-size: 1.5rem;
    }
    
    .clock-display .time {
        font-size: 2rem;
    }
    
    .article-footer {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
}

/* ==================== 动画效果 ==================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card {
    animation: fadeIn 0.5s ease;
}

.article-card:nth-child(1) { animation-delay: 0.1s; }
.article-card:nth-child(2) { animation-delay: 0.2s; }
.article-card:nth-child(3) { animation-delay: 0.3s; }
.article-card:nth-child(4) { animation-delay: 0.4s; }
.article-card:nth-child(5) { animation-delay: 0.5s; }
.article-card:nth-child(6) { animation-delay: 0.6s; }