:root {
    --primary: #1890ff;
    --success: #52c41a;
    --warning: #faad14;
    --danger: #f5222d;
    --text: #262626;
    --text-secondary: #595959;
    --bg: #f5f7fa;
    --card-bg: #ffffff;
    --border: #d9d9d9;
    --header-green: #d9ead3;
    --sidebar-width: 260px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
a {
    color: var(--primary);
    text-decoration: none;
}
a:hover {
    text-decoration: underline;
}
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
}

/* 左侧目录侧边栏 */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--card-bg);
    border-right: 1px solid var(--border);
    box-shadow: 2px 0 8px rgba(0,0,0,0.04);
    z-index: 100;
    display: flex;
    flex-direction: column;
}
.sidebar-header {
    padding: 20px 20px 16px;
    border-bottom: 1px solid #f0f0f0;
}
.sidebar-header h2 {
    margin: 0;
    font-size: 16px;
    color: var(--primary);
    font-weight: 600;
}
.sidebar-header p {
    margin: 6px 0 0;
    font-size: 12px;
    color: var(--text-secondary);
}
.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: 12px 0;
}
.sidebar-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
}
.sidebar-nav li {
    margin: 0;
}
.sidebar-nav a {
    display: flex;
    align-items: center;
    padding: 10px 20px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    border-left: 3px solid transparent;
    transition: all 0.2s;
}
.sidebar-nav a:hover {
    color: var(--primary);
    background: #f6ffed;
}
.sidebar-nav a.active {
    color: var(--primary);
    background: #e6f7ff;
    border-left-color: var(--primary);
    font-weight: 500;
}

/* 一级目录项 */
.nav-item > a {
    position: relative;
}
.toggle-icon,
.toggle-placeholder {
    width: 14px;
    height: 14px;
    margin-right: 8px;
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}
.toggle-icon {
    cursor: pointer;
    color: var(--text-secondary);
    transition: transform 0.2s;
}
.toggle-icon::before {
    content: '▸';
    font-size: 14px;
    font-weight: bold;
}
.nav-item.expanded > a .toggle-icon::before {
    content: '▾';
}
.toggle-icon:hover {
    color: var(--primary);
}
.nav-text {
    flex: 1;
}

/* 二级子目录 */
.sub-nav {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    background: #fafafa;
}
.nav-item.expanded > .sub-nav {
    max-height: 500px;
}
.sub-nav a {
    padding: 8px 20px 8px 42px;
    font-size: 13px;
    color: var(--text-secondary);
    border-left: 3px solid transparent;
}
.sub-nav a:hover {
    color: var(--primary);
    background: #f0f5ff;
}
.sub-nav a.active {
    color: var(--primary);
    background: #e6f7ff;
    border-left-color: var(--primary);
    font-weight: 500;
}
.sub-index {
    display: inline-block;
    min-width: 22px;
    color: var(--text-secondary);
    font-weight: 500;
    margin-right: 6px;
    opacity: 0.7;
}
.sub-nav a.active .sub-index {
    color: var(--primary);
    opacity: 1;
}
.sidebar-footer {
    padding: 12px 20px;
    border-top: 1px solid #f0f0f0;
    font-size: 12px;
    color: var(--text-secondary);
}
.sidebar-footer a {
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 4px;
}
.sidebar-footer a:hover {
    color: var(--primary);
    text-decoration: none;
}

/* 移动端目录按钮 */
.menu-toggle {
    display: none;
    position: fixed;
    top: 16px;
    left: 16px;
    z-index: 200;
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 8px;
    background: var(--primary);
    color: #fff;
    font-size: 18px;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

/* 遮罩层 */
.overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.4);
    z-index: 99;
}

/* 主内容区 */
.main {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
}
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 32px 32px 32px 40px;
}
header {
    background: linear-gradient(135deg, #2b4c8c 0%, #1890ff 100%);
    color: #fff;
    padding: 48px 32px;
    border-radius: 12px;
    margin-bottom: 32px;
    box-shadow: 0 8px 24px rgba(24,144,255,0.2);
}
header h1 {
    margin: 0 0 12px;
    font-size: 32px;
    font-weight: 600;
}
header p {
    margin: 0;
    font-size: 16px;
    opacity: 0.9;
    max-width: 900px;
}
section {
    background: var(--card-bg);
    border-radius: 10px;
    padding: 28px;
    margin-bottom: 24px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}
section h2 {
    margin: 0 0 20px;
    font-size: 22px;
    color: var(--primary);
    padding-bottom: 12px;
    border-bottom: 2px solid #e6f7ff;
}
section h3 {
    margin: 24px 0 12px;
    font-size: 17px;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}
section h3 .h3-text {
    flex: 1;
}
.tour-link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    border-radius: 16px;
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    color: #fff;
    font-size: 12px;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s ease;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.25);
    white-space: nowrap;
}
.tour-link:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}
.tour-link-icon {
    font-size: 10px;
}
section p {
    margin: 0 0 12px;
    color: var(--text-secondary);
}
.lead {
    font-size: 15px;
    color: var(--text);
    background: #f6ffed;
    border-left: 4px solid var(--success);
    padding: 16px 20px;
    border-radius: 0 8px 8px 0;
}
table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
    font-size: 14px;
}
th, td {
    border: 1px solid var(--border);
    padding: 12px 14px;
    text-align: left;
    vertical-align: top;
}
th {
    background: var(--header-green);
    color: var(--text);
    font-weight: 600;
    white-space: nowrap;
}
tr:nth-child(even) td {
    background: #fafafa;
}
.tag {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 12px;
    margin-right: 6px;
    font-weight: 500;
}
.tag-blue { background: #e6f7ff; color: #096dd9; }
.tag-green { background: #f6ffed; color: #389e0d; }
.tag-orange { background: #fff7e6; color: #d46b08; }
.tag-red { background: #fff1f0; color: #cf1322; }

/* 行内引导链接 */
.inline-tour-link {
    display: inline-flex;
    align-items: center;
    gap: 3px;
    padding: 2px 8px;
    border-radius: 12px;
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    color: #fff;
    font-size: 11px;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s ease;
    box-shadow: 0 1px 4px rgba(99, 102, 241, 0.25);
    white-space: nowrap;
    vertical-align: middle;
    margin-left: 6px;
}
.inline-tour-link:hover {
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.4);
}
.inline-tour-icon {
    font-size: 9px;
}

ul.feature-list li {
    display: flex;
    align-items: flex-start;
    gap: 8px;
}
ul.feature-list li .list-item-text {
    flex: 1;
}

th.tour-header,
td.tour-cell {
    width: 60px;
    text-align: center;
    white-space: nowrap;
}
td.tour-cell {
    padding: 8px 4px;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 10px;
}
.card-header h4 {
    margin: 0;
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-top: 16px;
}
.card {
    background: #fafafa;
    border-radius: 8px;
    padding: 18px;
    border: 1px solid #f0f0f0;
}
.card-header h4 {
    margin: 0;
    font-size: 15px;
    color: var(--primary);
}
.card p {
    margin: 0;
    font-size: 14px;
}
ul.feature-list {
    margin: 8px 0;
    padding-left: 20px;
}
ul.feature-list li {
    margin-bottom: 8px;
    color: var(--text-secondary);
}
footer {
    text-align: center;
    padding: 32px 0;
    color: var(--text-secondary);
    font-size: 13px;
}

@media (max-width: 768px) {
    .menu-toggle { display: block; }
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s;
    }
    .sidebar.open {
        transform: translateX(0);
    }
    .overlay.open { display: block; }
    .main { margin-left: 0; }
    .container { padding: 24px 20px; }
    header { padding: 32px 20px; }
    header h1 { font-size: 24px; }
    .grid-2 { grid-template-columns: 1fr; }
}