@charset "utf-8";
/* ============================================================
 * 苏玉博客 blog.suyu.uk - 文章悬浮目录树组件 (suyu-toc)
 * 日期: 2026-09-21
 * 说明: 独立组件，所有 class 均带 suyu-toc 前缀，不修改主题原有样式；
 *       色调跟随 echo 主题(亮: 白底/#1e9fff 主题蓝; 暗: #232323 深底)
 * ============================================================ */

/* 锚点定位时为固定顶部导航预留偏移 */
#preview h1,
#preview h2,
#preview h3,
#preview h4,
#preview h5,
#preview h6 {
    scroll-margin-top: 80px;
}

/* 悬浮面板：顶部与左缘均由 JS 按文章卡片实测位置写入，保证缩放不错位 */
.suyu-toc {
    position: fixed;
    top: var(--suyu-toc-top, 80px);
    left: var(--suyu-toc-left, 12px);
    z-index: 999;
    width: 210px;
    max-height: calc(100vh - var(--suyu-toc-top, 80px) - 20px);
    display: flex;
    flex-direction: column;
    background: rgba(255, 255, 255, 0.85);
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
    border: 1px solid #eee;
    border-radius: 8px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    opacity: 0.85;
    transition: opacity 0.25s ease;
    overflow: hidden;
    font-size: 13px;
    box-sizing: border-box;
}

/* 鼠标停留时完全不透明 */
.suyu-toc:hover {
    opacity: 1;
}

/* 标题栏（点击可折叠/展开） */
.suyu-toc__head {
    padding: 9px 12px;
    color: #333;
    font-weight: 600;
    border-bottom: 1px solid #f0f0f0;
    cursor: pointer;
    -webkit-user-select: none;
    user-select: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex: 0 0 auto;
}

.suyu-toc__toggle {
    color: #999;
    font-style: normal;
    line-height: 1;
    transition: transform 0.25s ease;
}

.suyu-toc--collapsed .suyu-toc__toggle {
    transform: rotate(-90deg);
}

/* 目录列表容器 */
.suyu-toc__body {
    padding: 8px 0;
    overflow-y: auto;
    flex: 1 1 auto;
}

.suyu-toc--collapsed .suyu-toc__body {
    display: none;
}

.suyu-toc ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.suyu-toc li {
    margin: 0;
    padding: 0;
}

.suyu-toc a {
    display: block;
    padding: 4px 12px;
    color: #666;
    line-height: 1.5;
    border-left: 2px solid transparent;
    word-break: break-word;
    text-decoration: none;
    transition: color 0.15s ease, background-color 0.15s ease;
}

.suyu-toc a:hover {
    color: #1e9fff;
    background: rgba(30, 159, 255, 0.06);
}

.suyu-toc a.is-active {
    color: #1e9fff;
    border-left-color: #1e9fff;
    background: rgba(30, 159, 255, 0.08);
    font-weight: 600;
}

/* 层级缩进（嵌套 ul 即更深一级标题） */
.suyu-toc ul ul {
    padding-left: 12px;
}

/* 滚动条美化 */
.suyu-toc__body::-webkit-scrollbar {
    width: 4px;
}

.suyu-toc__body::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.12);
    border-radius: 2px;
}

/* ---------------- 暗色模式（echo 主题 body.dark） ---------------- */
.dark .suyu-toc {
    background: rgba(35, 35, 35, 0.85);
    border-color: #414243;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.35);
}

.dark .suyu-toc__head {
    color: #ddd;
    border-bottom-color: #414243;
}

.dark .suyu-toc__toggle {
    color: #777;
}

.dark .suyu-toc a {
    color: #999;
}

.dark .suyu-toc a:hover {
    color: #1e9fff;
    background: rgba(30, 159, 255, 0.12);
}

.dark .suyu-toc a.is-active {
    color: #1e9fff;
    border-left-color: #1e9fff;
    background: rgba(30, 159, 255, 0.16);
}

.dark .suyu-toc__body::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.15);
}

/* ---------------- 响应式 ---------------- */
/* 中等屏幕：收窄（JS 默认折叠）；水平位置仍由 JS 实测，不写死 left */
@media (min-width: 1100px) and (max-width: 1499px) {
    .suyu-toc {
        width: 180px;
    }
}

/* 平板与手机：不显示 */
@media (max-width: 1099px) {
    .suyu-toc {
        display: none !important;
    }
}