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

:root {
    --primary: #165DFF;
    --primary-dark: #0E42D2;
    --bg: #F5F7FA;
    --card: #FFFFFF;
    --text: #1D2129;
    --text-secondary: #4E5969;
    --text-light: #86909C;
    --border: #E5E6EB;
    --success: #00B42A;
    --warning: #FF7D00;
    --danger: #F53F3F;
    --shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    --radius: 8px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: inherit;
}

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

/* 顶部导航 */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--card);
    box-shadow: var(--shadow);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary);
}

.nav-menu {
    display: flex;
    gap: 32px;
    list-style: none;
}

.nav-menu a {
    font-size: 15px;
    color: var(--text-secondary);
    transition: color 0.2s;
    padding: 8px 0;
    border-bottom: 2px solid transparent;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

/* Hero 区域 */
.hero {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: #fff;
    padding: 80px 0;
    text-align: center;
}

.hero h1 {
    font-size: 42px;
    margin-bottom: 16px;
}

.hero p {
    font-size: 18px;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

/* 区块通用 */
.section {
    padding: 60px 0;
}

.section-title {
    font-size: 28px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 40px;
    color: var(--text);
}

/* 卡片网格 */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

.card {
    background: var(--card);
    border-radius: var(--radius);
    padding: 28px;
    box-shadow: var(--shadow);
    transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.card-icon {
    width: 48px;
    height: 48px;
    background: rgba(22, 93, 255, 0.1);
    color: var(--primary);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 16px;
}

.card h3 {
    font-size: 18px;
    margin-bottom: 10px;
}

.card p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 16px;
}

.card-link {
    color: var(--primary);
    font-size: 14px;
    font-weight: 500;
}

/* 内容页面 */
.content-wrap {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 32px;
    padding: 40px 0;
}

.sidebar {
    position: sticky;
    top: 84px;
    align-self: start;
    background: var(--card);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
}

.sidebar h4 {
    font-size: 16px;
    margin-bottom: 12px;
    color: var(--text);
}

.sidebar-menu {
    list-style: none;
}

.sidebar-menu li {
    margin-bottom: 8px;
}

.sidebar-menu a {
    display: block;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 14px;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.sidebar-menu a:hover,
.sidebar-menu a.active {
    background: rgba(22, 93, 255, 0.1);
    color: var(--primary);
}

.main-content {
    background: var(--card);
    border-radius: var(--radius);
    padding: 36px;
    box-shadow: var(--shadow);
}

.main-content h2 {
    font-size: 24px;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}

.main-content h3 {
    font-size: 18px;
    margin: 28px 0 12px;
    color: var(--primary-dark);
}

.main-content p {
    margin-bottom: 12px;
    color: var(--text-secondary);
}

.main-content ul,
.main-content ol {
    margin: 12px 0 12px 24px;
    color: var(--text-secondary);
}

.main-content li {
    margin-bottom: 6px;
}

/* 表格样式 */
.data-table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0 24px;
    overflow-x: auto;
    display: block;
}

.data-table th,
.data-table td {
    border: 1px solid var(--border);
    padding: 10px 14px;
    text-align: left;
    font-size: 14px;
}

.data-table th {
    background: var(--bg);
    font-weight: 600;
    color: var(--text);
    white-space: nowrap;
}

.data-table tr:nth-child(even) {
    background: #FAFBFC;
}

/* 时间轴 */
.timeline {
    position: relative;
    padding-left: 32px;
    margin: 20px 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border);
}

.timeline-item {
    position: relative;
    margin-bottom: 28px;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -28px;
    top: 4px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--primary);
    border: 3px solid #fff;
    box-shadow: 0 0 0 2px var(--primary);
}

.timeline-item h4 {
    font-size: 16px;
    margin-bottom: 6px;
}

.timeline-item .time {
    font-size: 13px;
    color: var(--primary);
    font-weight: 500;
    margin-bottom: 6px;
}

.timeline-item p {
    font-size: 14px;
    color: var(--text-secondary);
}

/* 提示框 */
.alert {
    padding: 14px 18px;
    border-radius: 6px;
    margin: 16px 0;
    font-size: 14px;
}

.alert-warning {
    background: #FFF7E8;
    border-left: 4px solid var(--warning);
    color: #8A5300;
}

.alert-danger {
    background: #FFECE8;
    border-left: 4px solid var(--danger);
    color: #A81E1E;
}

.alert-success {
    background: #E8FFEA;
    border-left: 4px solid var(--success);
    color: #007A1F;
}

/* 清单复选框 */
.checklist {
    list-style: none;
    margin-left: 0 !important;
}

.checklist li {
    padding: 8px 0;
    padding-left: 28px;
    position: relative;
    border-bottom: 1px dashed var(--border);
}

.checklist li::before {
    content: '☐';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-size: 16px;
}

/* 页脚 */
.footer {
    background: #1D2129;
    color: var(--text-light);
    padding: 32px 0;
    text-align: center;
    font-size: 14px;
    margin-top: 60px;
}

/* 响应式 */
@media (max-width: 900px) {
    .content-wrap {
        grid-template-columns: 1fr;
    }
    .sidebar {
        position: static;
    }
    .nav-menu {
        gap: 16px;
    }
    .hero h1 {
        font-size: 32px;
    }
    .main-content {
        padding: 24px;
    }
}

@media (max-width: 600px) {
    .nav {
        flex-wrap: wrap;
        height: auto;
        padding: 12px 0;
    }
    .nav-menu {
        width: 100%;
        justify-content: space-between;
        margin-top: 8px;
        flex-wrap: wrap;
        gap: 8px;
    }
    .hero {
        padding: 48px 0;
    }
    .hero h1 {
        font-size: 26px;
    }
    .section {
        padding: 36px 0;
    }
    .section-title {
        font-size: 22px;
    }
}