/* === 全局变量定义 === */
:root {
    /* 基础色彩 */
    --primary-color: #2563eb;
    --secondary-color: #7c3aed;
    --accent-color: #06b6d4;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    
    /* 主题色彩 */
    --smart-wearables-color: #3b82f6;
    --user-profile-color: #8b5cf6;
    --traffic-color: #10b981;
    --financial-color: #ef4444;
    --annual-color: #f59e0b;
    --enrollment-color: #06b6d4;
    
    /* 渐变色彩 */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-success: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-warning: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    
    /* 中性色彩 */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-tertiary: #94a3b8;
    --border-color: #e2e8f0;
    --shadow-color: rgba(0, 0, 0, 0.1);
    
    /* 字体大小 */
    --font-xs: 0.75rem;
    --font-sm: 0.875rem;
    --font-base: 1rem;
    --font-lg: 1.125rem;
    --font-xl: 1.25rem;
    --font-2xl: 1.5rem;
    --font-3xl: 1.875rem;
    
    /* 间距 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* 圆角 */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* 过渡 */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* === 暗色主题 === */
[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    --border-color: #475569;
    --shadow-color: rgba(0, 0, 0, 0.3);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: var(--font-base);
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    transition: background-color var(--transition-base), color var(--transition-base);
}

/* === 顶部导航栏 === */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--bg-primary);
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.8);
    border-bottom: 1px solid var(--border-color);
    transition: all var(--transition-base);
}

[data-theme="dark"] .header {
    background: rgba(15, 23, 42, 0.9);
}

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-xl);
    max-width: 1400px;
    margin: 0 auto;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-xl);
    font-weight: 700;
    color: var(--primary-color);
}

.nav-brand i {
    font-size: var(--font-2xl);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link:hover {
    color: var(--primary-color);
    background: var(--bg-tertiary);
}

.nav-link.active {
    color: var(--primary-color);
    background: var(--bg-tertiary);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width var(--transition-fast);
}

.nav-link.active::after {
    width: 80%;
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.theme-toggle,
.fullscreen-toggle {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.theme-toggle:hover,
.fullscreen-toggle:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* === 主容器 === */
.main-container {
    display: flex;
    margin-top: 70px;
    min-height: calc(100vh - 70px);
}

/* === 侧边栏 === */
.sidebar {
    width: 280px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    position: fixed;
    left: 0;
    top: 70px;
    height: calc(100vh - 70px);
    overflow-y: auto;
    transform: translateX(0);
    transition: transform var(--transition-base);
    z-index: 999;
}

.sidebar.collapsed {
    transform: translateX(-100%);
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg) var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
}

.sidebar-header h3 {
    font-size: var(--font-lg);
    font-weight: 600;
    color: var(--text-primary);
}

.sidebar-toggle {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: var(--font-lg);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.sidebar-toggle:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.sidebar-nav {
    padding: var(--spacing-md);
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    text-decoration: none;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    font-weight: 500;
}

.sidebar-link:hover {
    background: var(--bg-tertiary);
    color: var(--primary-color);
    transform: translateX(4px);
}

.sidebar-link.active {
    background: var(--primary-color);
    color: white;
}

.sidebar-link i {
    width: 20px;
    text-align: center;
}

/* === 内容区域 === */
.content {
    flex: 1;
    margin-left: 280px;
    padding: var(--spacing-xl);
    transition: margin-left var(--transition-base);
}

.content.expanded {
    margin-left: 0;
}

.mobile-menu-btn {
    display: none;
    position: fixed;
    top: 85px;
    left: var(--spacing-lg);
    z-index: 1001;
    background: var(--primary-color);
    color: white;
    border: none;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    box-shadow: var(--shadow-lg);
}

/* === 模块样式 === */
.module {
    margin-bottom: var(--spacing-2xl);
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

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

.module-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-xl);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.module-header h2 {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: var(--font-2xl);
    font-weight: 700;
    color: var(--text-primary);
}

.module-header h2 i {
    color: var(--primary-color);
}

.module-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.chart-type-selector select {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: var(--font-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.chart-type-selector select:hover {
    border-color: var(--primary-color);
}

.chart-type-selector select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.fullscreen-btn {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

/* === 图表网格 === */
.charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: var(--spacing-xl);
    padding: var(--spacing-xl);
}

.chart-container {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    border: 1px solid var(--border-color);
    transition: all var(--transition-base);
}

.chart-container:hover {
    box-shadow: var(--shadow-md);
}

.chart-container.full-width {
    grid-column: 1 / -1;
}

.chart-container h3 {
    font-size: var(--font-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.chart-wrapper {
    position: relative;
    height: 300px;
    margin-bottom: var(--spacing-lg);
}

.chart-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.stat-item {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.stat-item:hover {
    background: var(--bg-tertiary);
    transform: translateY(-2px);
}

.stat-label {
    display: block;
    font-size: var(--font-sm);
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-xs);
}

.stat-value {
    display: block;
    font-size: var(--font-lg);
    font-weight: 700;
    color: var(--primary-color);
}

/* === 返回顶部按钮 === */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    background: var(--primary-color);
    color: white;
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-lg);
    z-index: 998;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--secondary-color);
    transform: translateY(-4px);
}

/* === 全屏模式 === */
.fullscreen-mode {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 9999;
    background: var(--bg-primary);
    overflow: auto;
}

.fullscreen-mode .module {
    height: 100vh;
    display: flex;
    flex-direction: column;
}

.fullscreen-mode .module-header {
    flex-shrink: 0;
}

.fullscreen-mode .charts-grid {
    flex: 1;
    padding: var(--spacing-xl);
}

.fullscreen-mode .chart-wrapper {
    height: calc(100vh - 300px);
}

/* === 模块特定色彩 === */
#smart-wearables .module-header {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(147, 51, 234, 0.1) 100%);
    border-left: 4px solid var(--smart-wearables-color);
}

#user-profile .module-header {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1) 0%, rgba(236, 72, 153, 0.1) 100%);
    border-left: 4px solid var(--user-profile-color);
}

#traffic-data .module-header {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(6, 182, 212, 0.1) 100%);
    border-left: 4px solid var(--traffic-color);
}

#financial-data .module-header {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.1) 0%, rgba(245, 158, 11, 0.1) 100%);
    border-left: 4px solid var(--financial-color);
}

#annual-trends .module-header {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.1) 0%, rgba(251, 146, 60, 0.1) 100%);
    border-left: 4px solid var(--annual-color);
}

#enrollment .module-header {
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.1) 0%, rgba(59, 130, 246, 0.1) 100%);
    border-left: 4px solid var(--enrollment-color);
}

/* === 响应式设计 === */
@media (max-width: 1200px) {
    .charts-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .navbar {
        padding: var(--spacing-md) var(--spacing-lg);
    }
    
    .nav-menu {
        display: none;
    }
    
    .nav-controls {
        gap: var(--spacing-sm);
    }
    
    .sidebar {
        width: 100%;
        transform: translateX(-100%);
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .content {
        margin-left: 0;
        padding: var(--spacing-lg);
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .module-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
    
    .module-controls {
        width: 100%;
        justify-content: space-between;
    }
    
    .chart-stats {
        grid-template-columns: 1fr;
    }
    
    .chart-wrapper {
        height: 250px;
    }
}

@media (max-width: 480px) {
    .content {
        padding: var(--spacing-md);
    }
    
    .module {
        margin-bottom: var(--spacing-xl);
    }
    
    .module-header {
        padding: var(--spacing-lg);
    }
    
    .charts-grid {
        padding: var(--spacing-lg);
        gap: var(--spacing-lg);
    }
    
    .chart-container {
        padding: var(--spacing-md);
    }
    
    .chart-wrapper {
        height: 200px;
    }
}

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

.module {
    animation: fadeIn 0.6s ease forwards;
}

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

/* === 加载动画 === */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 300px;
    color: var(--text-tertiary);
}

.loading::after {
    content: '';
    width: 30px;
    height: 30px;
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-left: var(--spacing-md);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* === 打印样式 === */
@media print {
    .header,
    .sidebar,
    .module-controls,
    .back-to-top,
    .mobile-menu-btn {
        display: none;
    }
    
    .content {
        margin-left: 0;
        padding: 0;
    }
    
    .module {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ccc;
        margin-bottom: 1rem;
    }
    
    .chart-wrapper {
        height: 400px;
    }
}