/* nav.css */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f6f9;
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar {
    width: 100%;
    height: 100vh;
    background-color: #f4f6f9;
    border-right: 1px solid #ddd;
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    user-select: none;
    overflow: hidden;
}

/* 顶部返回链接容器 - 靠右显示 */
.sidebar-top-link {
    flex-shrink: 0;
    padding: 16px 20px 12px 20px;
    background-color: #f4f6f9;
    border-bottom: 1px solid #e0e0e0;
    display: flex;
    justify-content: flex-end;
}

.top-back-link {
    display: inline-block;
    padding: 8px 18px 8px 14px;
    font-size: 0.95rem;
    font-weight: 500;
    color: #11477c;
    background-color: #ffffff;
    border: 1px solid #b0c4de;
    border-radius: 30px;
    text-decoration: none;
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
    transition: all 0.2s ease;
    letter-spacing: 0.3px;
}

.top-back-link:hover {
    background-color: #11477c;
    color: #ffffff;
    border-color: #11477c;
    box-shadow: 0 4px 8px rgba(17,71,124,0.15);
    transform: translateY(-1px);
}

.top-back-link:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.sidebar-scroll {
    flex: 1;
    overflow-y: auto;
}

.sidebar-footer {
    flex-shrink: 0;
    padding: 20px 18px;
    background-color: #11477c;
    border-top: 2px solid #2c3e50;
    box-shadow: 0 -4px 8px rgba(0,0,0,0.02);
    margin: 0;
}

.feedback-card {
    background-color: transparent;
    padding: 0;
    border-radius: 0;
    box-shadow: none;
    border: none;
    transition: none;
    line-height: 1.5;
    color: #2c3e50;
    font-size: 0.95rem;
}

.feedback-card .back-link {
    font-size: 0.9rem;
    padding: 10px 16px;
    white-space: normal;
    text-align: left;
    display: inline-block;
    width: auto;
    color: #ecf0f1;
    text-decoration: none;
    border-radius: 18px;
    background-color: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    transition: all 0.2s;
}

.feedback-card .back-link:hover {
    background-color: rgba(255,255,255,0.2);
    border-color: rgba(255,255,255,0.3);
    color: white;
}

.category-group {
    border-bottom: 1px solid #e0e0e0;
}

.category-title {
    background-color: #e9ecef;
    padding: 15px 20px;
    font-weight: bold;
    color: #495057;
    cursor: default;
    font-size: 1.1rem;
    border-left: 5px solid #2c3e50;
}

.doc-list {
    list-style: none;
}

.doc-link {
    display: block;
    padding: 12px 20px 12px 35px;
    text-decoration: none;
    color: #555;
    transition: all 0.2s;
    border-bottom: 1px solid #eee;
    font-size: 0.95rem;
    background-color: transparent;
    cursor: pointer;
}

.doc-link:hover {
    background-color: #e2e6ea;
    color: #000;
}

/* 激活的导航链接样式 */
.doc-link.active {
    color: #1890ff !important;
    background: linear-gradient(90deg, rgba(24, 144, 255, 0.08) 0%, transparent 100%);
    border-left: 3px solid #1890ff;
    padding-left: 12px !important;
    font-weight: 500;
}

/* 可选：深色主题的激活样式 */
@media (prefers-color-scheme: dark) {
    .doc-link.active {
        color: #69c0ff !important;
        background: linear-gradient(90deg, rgba(105, 192, 255, 0.1) 0%, transparent 100%);
        border-left-color: #69c0ff;
    }
}

/* 响应式 */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        max-width: 768px;
        box-shadow: 2px 0 12px rgba(0,0,0,0.2);
    }

    .sidebar-top-link {
        padding: 12px 15px 8px 15px;
        display: flex;
        justify-content: flex-end;
    }

    .top-back-link {
        font-size: 0.85rem;
        padding: 6px 14px 6px 12px;
    }

    .sidebar-footer {
        padding: 12px 10px;
    }

    .feedback-card {
        font-size: 0.85rem;
        padding: 6px 10px;
        margin: 0;
    }

    .feedback-card .back-link {
        font-size: 0.8rem;
        padding: 6px 10px;
        white-space: normal;
        text-align: center;
    }
}