/* 自定义样式 */
:root {
    --primary: #1e88e5;
    --secondary: #64b5f6;
    --light: #e3f2fd;
    --dark: #0d47a1;
    --accent: #8e24aa;
}

/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', system-ui, sans-serif;
    line-height: 1.6;
    color: var(--dark);
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 网格背景 */
.bg-grid {
    background-image: 
        linear-gradient(rgba(30, 136, 229, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(30, 136, 229, 0.05) 1px, transparent 1px);
    background-size: 20px 20px;
}

/* 导航栏样式 */
.nav-link {
    position: relative;
    padding: 0.5rem 0;
    transition: all 0.3s ease;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    transition: width 0.3s ease;
}

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

/* 卡片悬停效果 */
.card-hover {
    transition: all 0.3s ease;
}

.card-hover:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px -10px rgba(30, 136, 229, 0.2);
}

/* 按钮样式 */
.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border: none;
    color: white;
    padding: 1rem 2rem;
    border-radius: 0.75rem;
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(30, 136, 229, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(30, 136, 229, 0.4);
}

.btn-secondary {
    background: white;
    border: 2px solid var(--primary);
    color: var(--primary);
    padding: 1rem 2rem;
    border-radius: 0.75rem;
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
}

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

/* 代码块样式 */
.code-block {
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid rgba(30, 136, 229, 0.2);
    border-radius: 0.75rem;
    padding: 1.5rem;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.875rem;
    color: var(--primary);
    overflow-x: auto;
    position: relative;
}

.code-block::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    border-radius: 0.75rem 0.75rem 0 0;
}

/* 渐变文字 */
.gradient-text {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 特色图标 */
.feature-icon {
    width: 4rem;
    height: 4rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 8px 20px rgba(30, 136, 229, 0.3);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-link {
        padding: 1rem 0;
        font-size: 1.125rem;
    }
    
    .feature-icon {
        width: 3rem;
        height: 3rem;
        font-size: 1.25rem;
    }
    
    .sidebar {
        position: fixed !important;
        left: -100%;
        top: 80px;
        width: 100%;
        height: calc(100vh - 80px);
        background: white;
        z-index: 40;
        transition: left 0.3s ease;
    }
    
    .sidebar.show {
        left: 0;
    }
    
    .content-area {
        margin-left: 0;
        padding: 1rem;
    }
    
    main {
        margin-left: 0 !important;
    }
}

@media (max-width: 640px) {
    .btn-primary, .btn-secondary {
        padding: 0.75rem 1.5rem;
        font-size: 0.875rem;
    }
    
    .code-block {
        font-size: 0.75rem;
        padding: 1rem;
    }
    
    .feature-icon {
        width: 2.5rem;
        height: 2.5rem;
        font-size: 1rem;
    }
}

/* 平板设备优化 */
@media (min-width: 768px) and (max-width: 1024px) {
    .container {
        padding-left: 2rem;
        padding-right: 2rem;
    }
    
    .sidebar {
        width: 250px;
    }
    
    main {
        margin-left: 250px;
    }
}

/* 大屏幕优化 */
@media (min-width: 1920px) {
    .container {
        max-width: 1400px;
    }
}

/* 打印样式 */
@media print {
    .sidebar, header, footer {
        display: none;
    }
    
    main {
        margin-left: 0 !important;
    }
    
    .code-block {
        border: 1px solid #ccc;
        page-break-inside: avoid;
    }
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* 滚动指示器 */
.scroll-indicator {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    transform-origin: left;
    transform: scaleX(0);
    transition: transform 0.3s ease;
    z-index: 1000;
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(30, 136, 229, 0.3);
    border-radius: 50%;
    border-top-color: var(--primary);
    animation: spin 1s ease-in-out infinite;
}

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

/* 工具提示 */
.tooltip {
    position: relative;
    cursor: help;
}

.tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--dark);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
}

.tooltip:hover::after {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(-5px);
}