:root {
    --primary: #2563eb;
    --secondary: #64748b;
    --danger: #ef4444;
    --success: #22c55e;
    --warning: #f59e0b;
    --bg: #f8fafc;
    --text: #0f172a;
}

body {
    font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.8;
    margin: 0;
    display: flex;
}

/* 侧边导航 */
.sidebar-nav {
    width: 260px;
    height: 100vh;
    background: #ffffff;
    border-right: 1px solid #e2e8f0;
    position: fixed;
    padding: 20px;
    overflow-y: auto;
    top: 0;
    left: 0;
    z-index: 100;
}

.sidebar-nav h2 { 
    font-size: 1.2rem; 
    color: var(--primary); 
    margin-top: 20px; /* 留出面包屑导航空间 */
}

.sidebar-nav a {
    display: block;
    padding: 10px;
    color: var(--secondary);
    text-decoration: none;
    border-radius: 6px;
    transition: 0.2s;
    font-size: 0.95rem;
}

.sidebar-nav a:hover { 
    background: #f1f5f9; 
    color: var(--primary); 
}

/* 主体内容 */
main {
    flex: 1;
    margin-left: 300px;
    max-width: calc(100% - 320px);
    padding: 40px;
    box-sizing: border-box;
}

.section {
    background-color: white;
    border-left: 5px solid #3498db;
    border-radius: 5px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
    max-width: 1000px;
    margin-left: 0;
    margin-right: auto;
}

/* 确保所有内容元素都填充容器的宽度 */
.section > * {
    max-width: 100%;
    width: 100%;
    box-sizing: border-box;
}

h1 { font-size: 2.5rem; margin-bottom: 10px; }
h2 { border-left: 5px solid var(--primary); padding-left: 15px; margin-top: 40px; }
h3 { color: var(--primary); margin-top: 30px; }

.prep-list { 
    background: #f1f5f9; 
    padding: 20px; 
    border-radius: 8px; 
}
.prep-list ul { padding-left: 20px; }

.media-box {
    background: #e2e8f0;
    border: 2px dashed #cbd5e1;
    padding: 40px;
    text-align: center;
    margin: 20px 0;
    border-radius: 8px;
    color: #64748b;
}

.logic-box {
    background: #fff7ed;
    border-left: 4px solid var(--warning);
    padding: 15px;
    margin: 15px 0;
}

.solution {
    background: #f0fdf4;
    border: 1px solid #bbf7d0;
    padding: 15px;
    border-radius: 8px;
    margin-top: 15px;
}

.solution strong { color: var(--success); }

.log-demo {
    background: #1e293b;
    color: #38bdf8;
    padding: 15px;
    border-radius: 6px;
    font-family: monospace;
    margin: 10px 0;
}

.error-text { color: var(--danger); font-weight: bold; }

/* 提示框样式 */
/* 提示框样式 - 优化版 */
.tip-box {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    border: 1px solid rgba(37, 99, 235, 0.2);
    border-left: 4px solid var(--primary);
    padding: 24px;
    margin: 24px 0;
    border-radius: 12px;
    color: var(--text);
    font-size: 1rem;
    line-height: 1.7;
    box-sizing: border-box;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.tip-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--primary);
    border-radius: 4px 0 0 4px;
}

.tip-box:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.1);
    border-color: rgba(37, 99, 235, 0.3);
}

/* 提示标题样式 */
.tip-box h3 {
    color: var(--primary);
    margin-top: 0;
    margin-bottom: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* 添加提示图标 */
.tip-box h3::before {
    content: '💡';
    font-size: 1.2rem;
    opacity: 0.8;
}

/* 提示框内段落 */
.tip-box p {
    margin: 8px 0;
    color: #334155;
}

/* 提示框内列表 */
.tip-box ul {
    margin: 12px 0;
    padding-left: 20px;
}

.tip-box li {
    margin-bottom: 6px;
    color: #475569;
}

/* 引用样式（如果有的话） */
.tip-box blockquote {
    border-left: 3px solid #94a3b8;
    margin: 16px 0;
    padding-left: 16px;
    color: #64748b;
    font-style: italic;
}

/* 代码样式 */
.tip-box code {
    background: rgba(37, 99, 235, 0.1);
    color: #1e40af;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
    font-size: 0.9em;
}

/* 不同类型的提示框变体 */
.tip-box.warning {
    background: linear-gradient(135deg, #fefce8 0%, #fef3c7 100%);
    border-left-color: #f59e0b;
}

.tip-box.warning::before {
    background: #f59e0b;
}

.tip-box.warning h3 {
    color: #d97706;
}

.tip-box.warning h3::before {
    content: '⚠️';
}

.tip-box.success {
    background: linear-gradient(135deg, #f0fdf4 0%, #dcfce7 100%);
    border-left-color: #22c55e;
}

.tip-box.success::before {
    background: #22c55e;
}

.tip-box.success h3 {
    color: #16a34a;
}

.tip-box.success h3::before {
    content: '✅';
}

/* 移动端优化 */
@media (max-width: 768px) {
    .tip-box {
        padding: 20px;
        margin: 20px 0;
        border-radius: 10px;
    }
    
    .tip-box h3 {
        font-size: 1rem;
    }
}

/* 宽屏优化 */
@media (min-width: 1600px) {
    .section {
        max-width: 1200px;
    }
}

/* 中等屏幕调整 */
@media (max-width: 1300px) {
    main {
        margin-left: 280px;
        max-width: calc(100% - 300px);
    }
    nav {
        width: 240px;
    }
}

/* 移动端隐藏侧边栏 */
@media (max-width: 768px) {
    .sidebar-nav { 
        display: none; 
    }
    
    main { 
        margin-left: 0; 
        max-width: 100%;
        padding: 20px;
    }
}