/* ============================================================
   Elegant TOC v1.7.0 — Adaptive Layout
   桌面端：左侧悬浮侧边栏
   移动端/空间不足：左下角触发按钮 + 底部浮层面板
   ============================================================ */

html { scroll-behavior: smooth; }

.elegant-toc-heading {
  scroll-margin-top: var(--et-scroll-offset, 5.5rem);
}

/* ---------- 基础变量 ---------- */
#elegant-toc.elegant-toc {
  --et-accent: #1a1a1a;
  --et-accent-light: #666;
  --et-border: #e0e0e0;
  --et-bg: #ffffff;
  --et-text: #1a1a1a;
  --et-muted: #555;
  --et-faint: #999;
  --et-hover-bg: #f8f9fa;
  --et-active-bg: #f0f2f5;
  --et-radius: 12px;
  --et-font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  /* 基准字号：默认回退值，运行时会由 JS 同步为文章正文的实际字号 */
  --et-base-font-size: 1rem;

  all: initial;
  display: block;
  box-sizing: border-box;
  font-family: var(--et-font);
  position: fixed;
  left: 20px;
  bottom: 20px;
  z-index: 9999;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

#elegant-toc.elegant-toc *,
#elegant-toc.elegant-toc *::before,
#elegant-toc.elegant-toc *::after {
  box-sizing: border-box;
}

/* ---------- 触发按钮（小屏/空间不足时左下角悬浮） ---------- */
#elegant-toc .elegant-toc-trigger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
  border: 1px solid rgba(0, 0, 0, 0.08);
  color: var(--et-text);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.06);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  appearance: none;
  -webkit-appearance: none;
  padding: 0;
  line-height: 0;
  position: relative;
}

#elegant-toc .elegant-toc-trigger::before {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(26, 26, 26, 0.05) 0%, rgba(26, 26, 26, 0.02) 100%);
  opacity: 0;
  transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: -1;
}

#elegant-toc .elegant-toc-trigger:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15), 0 2px 6px rgba(0, 0, 0, 0.08);
  background: linear-gradient(135deg, #ffffff 0%, #fafbfc 100%);
  border-color: rgba(0, 0, 0, 0.12);
}

#elegant-toc .elegant-toc-trigger:hover::before {
  opacity: 1;
}

/* 触发按钮鼠标悬浮提示 */
#elegant-toc .elegant-toc-trigger::after {
  content: attr(data-tooltip);
  position: absolute;
  left: 50%;
  bottom: calc(100% + 12px);
  transform: translateX(-50%) translateY(8px);
  padding: 6px 12px;
  background: rgba(0, 0, 0, 0.85);
  color: #fff;
  font-size: 13px;
  font-weight: 500;
  line-height: 1.4;
  border-radius: 6px;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: opacity 220ms cubic-bezier(.22,1,.36,1), transform 260ms cubic-bezier(.22,1,.36,1);
  pointer-events: none;
  z-index: 10000;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

#elegant-toc .elegant-toc-trigger:hover::after {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

/* 在键盘聚焦或 JS 标注的可见状态下也展示提示 */
#elegant-toc .elegant-toc-trigger.et-tooltip-visible::after {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

#elegant-toc .elegant-toc-trigger:active {
  transform: translateY(0) scale(0.98);
}

#elegant-toc .elegant-toc-trigger svg {
  display: block;
  width: 24px;
  height: 24px;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

#elegant-toc .elegant-toc-trigger:hover svg {
  transform: scale(1.1);
}

/* ---------- 目录面板（默认隐藏） ---------- */
/* 面板：更丰富的玻璃质感 + 更流畅的变换过渡 */
#elegant-toc .elegant-toc-panel {
  position: fixed;
  left: 20px;
  bottom: 88px;
  z-index: 1;
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px) scale(0.985);
  transform-origin: left bottom;
  transition: opacity 240ms cubic-bezier(.22,1,.36,1),
              transform 300ms cubic-bezier(.22,1,.36,1);
  will-change: transform, opacity;

  background: linear-gradient(180deg, rgba(255,255,255,0.9) 0%, rgba(250,250,252,0.85) 100%);
  border: 1px solid rgba(17,24,39,0.06);
  border-radius: calc(var(--et-radius) + 2px);
  padding: 1.25rem 1.35rem;
  width: 260px;
  max-width: calc(100vw - 40px);
  overflow: hidden;
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--et-text);
  box-shadow: 0 18px 54px rgba(10, 15, 25, 0.12),
              0 6px 20px rgba(10, 15, 25, 0.06);
  backdrop-filter: blur(10px) saturate(120%);
  -webkit-backdrop-filter: blur(10px) saturate(120%);
  /* 关键：让目录整体字号跟随文章正文 */
  font-size: var(--et-base-font-size);
}

/* 打开时显式类，便于 JS 控制进入/离开动画 */
#elegant-toc .elegant-toc-panel.et-open {
  visibility: visible;
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

#elegant-toc .elegant-toc-panel.et-closing {
  opacity: 0;
  transform: translateY(8px) scale(0.99);
  pointer-events: none;
}

/* ---------- 移动端展开：底部浮层面板 ---------- */
#elegant-toc.elegant-toc--mobile-open .elegant-toc-trigger {
  opacity: 0;
  transform: scale(0.8);
  pointer-events: none;
}

#elegant-toc.elegant-toc--mobile-open .elegant-toc-panel {
  left: 20px;
  bottom: 88px;
  width: calc(50% - 20px);
  max-width: 240px;
  max-height: 70vh;
  overflow-y: auto;
  /* 确保 JS 会加上 .et-open 类来触发统一的动画 */
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

@keyframes panelSlideIn {
  0% { opacity: 0; transform: translateY(16px) scale(0.92); }
  100% { opacity: 1; transform: translateY(0) scale(1); }
}

@media (min-width: 600px) and (max-width: 1023px) {
  #elegant-toc.elegant-toc--mobile-open .elegant-toc-panel {
    max-width: 240px;
    padding: 1.25rem 1.5rem;
    font-size: var(--et-base-font-size);
  }
}

/* ---------- 桌面端侧边栏 ---------- */
#elegant-toc.elegant-toc--sidebar .elegant-toc-trigger {
  display: none;
}

#elegant-toc.elegant-toc--sidebar .elegant-toc-panel {
  left: var(--et-sidebar-left, 20px);
  top: calc(var(--et-sidebar-top, 100px) + 10px);
  bottom: auto;
  transform: none;
  transform-origin: center top;
  visibility: visible;
  opacity: 1;
  pointer-events: auto;
  width: 240px;
  max-height: calc(100vh - var(--et-scroll-offset, 100px) - 40px);
  overflow-y: auto;
  box-shadow: none;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}

#elegant-toc.elegant-toc--sidebar.elegant-toc--hidden .elegant-toc-panel {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

/* ---------- 顶部装饰线（极细） ---------- */
#elegant-toc .elegant-toc-topbar {
  /* 已移除顶部细线装饰，视觉上更干净 */
  display: none !important;
}

/* ---------- Header ---------- */
#elegant-toc .elegant-toc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 0 0.85rem 0;
  margin: 0 0 0.75rem 0;
  border-bottom: 1px solid var(--et-border);
}

#elegant-toc .elegant-toc-header-left {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

/* 图标 — 极简线条风格 */
#elegant-toc .elegant-toc-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  height: 1.75rem;
  color: var(--et-text);
  flex-shrink: 0;
  line-height: 0;
  opacity: 0.7;
}

#elegant-toc .elegant-toc-icon svg {
  display: block;
  width: 16px;
  height: 16px;
}

#elegant-toc .elegant-toc-title {
  font-size: 1em;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--et-accent-light);
  white-space: nowrap;
}

/* 折叠按钮 */
#elegant-toc .elegant-toc-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  height: 1.75rem;
  background: transparent;
  border: none;
  border-radius: 4px;
  color: var(--et-faint);
  cursor: pointer;
  flex-shrink: 0;
  transition: color 0.2s ease, background 0.2s ease;
  line-height: 0;
  appearance: none;
  -webkit-appearance: none;
  padding: 0;
}

#elegant-toc .elegant-toc-toggle:hover {
  color: var(--et-text);
  background: var(--et-hover-bg);
}

#elegant-toc .elegant-toc-toggle svg {
  display: block;
  width: 14px;
  height: 14px;
  transition: transform 0.3s ease;
}

#elegant-toc.collapsed .elegant-toc-toggle svg {
  transform: rotate(180deg);
}

/* 移动端关闭按钮 */
#elegant-toc .elegant-toc-mobile-close {
  display: none;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  height: 1.75rem;
  background: transparent;
  border: none;
  border-radius: 4px;
  color: var(--et-faint);
  cursor: pointer;
  flex-shrink: 0;
  transition: color 0.2s ease, background 0.2s ease;
  line-height: 0;
  appearance: none;
  -webkit-appearance: none;
  padding: 0;
}

#elegant-toc .elegant-toc-mobile-close:hover {
  color: var(--et-text);
  background: var(--et-hover-bg);
}

#elegant-toc .elegant-toc-mobile-close svg {
  display: block;
  width: 16px;
  height: 16px;
}

/* 移动端展开时显示关闭按钮、隐藏折叠按钮；桌面端侧边栏模式下保持折叠按钮 */
#elegant-toc.elegant-toc--mobile-open:not(.elegant-toc--sidebar) .elegant-toc-toggle {
  display: none;
}

#elegant-toc.elegant-toc--mobile-open:not(.elegant-toc--sidebar) .elegant-toc-mobile-close {
  display: inline-flex;
}

#elegant-toc.elegant-toc--sidebar .elegant-toc-mobile-close {
  display: none !important;
}

/* 可访问性 */
#elegant-toc .elegant-toc-link:focus-visible,
#elegant-toc .elegant-toc-toggle:focus-visible,
#elegant-toc .elegant-toc-trigger:focus-visible,
#elegant-toc .elegant-toc-mobile-close:focus-visible {
  outline: 2px solid var(--et-accent);
  outline-offset: 2px;
}

/* ---------- List ---------- */
#elegant-toc .elegant-toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: calc(100vh - 200px);
  overflow-y: auto;
  overflow-x: hidden;
  transition: max-height 0.4s ease, opacity 0.3s ease;
}

#elegant-toc.collapsed .elegant-toc-list {
  max-height: 0;
  opacity: 0;
  pointer-events: none;
  overflow: hidden;
}

/* 移动端展开时始终显示列表（不受桌面折叠状态影响） */
#elegant-toc.elegant-toc--mobile-open .elegant-toc-list {
  max-height: 60vh;
  opacity: 1;
  pointer-events: auto;
  overflow-y: auto;
}

#elegant-toc .elegant-toc-list::-webkit-scrollbar {
  width: 4px;
}
#elegant-toc .elegant-toc-list::-webkit-scrollbar-thumb {
  background: var(--et-border);
  border-radius: 4px;
}

/* ---------- Items ---------- */
#elegant-toc .elegant-toc-item {
  list-style: none;
  margin: 0;
  padding: 0;
}

#elegant-toc .elegant-toc-item::before,
#elegant-toc .elegant-toc-item::after {
  content: none;
  display: none;
}

/* ---------- Links ---------- */
#elegant-toc .elegant-toc-link {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.3rem 0.6rem;
  margin: 0.05rem 0;
  text-decoration: none;
  color: var(--et-muted);
  border: none !important;
  border-radius: 4px;
  background: transparent;
  font-family: inherit;
  font-size: 1em;
  font-weight: 400;
  line-height: 1.5;
  cursor: pointer;
  transition: color 0.2s ease, background 0.2s ease;
  box-shadow: none !important;
  outline: none;
}

#elegant-toc .elegant-toc-link:hover {
  color: var(--et-text);
  background: var(--et-hover-bg);
  text-decoration: none;
}

#elegant-toc .elegant-toc-link.active {
  color: var(--et-text);
  font-weight: 500;
  background: var(--et-active-bg);
}

/* ---------- Bullet（极简小圆点） ---------- */
#elegant-toc .elegant-toc-bullet {
  width: 4px;
  height: 4px;
  min-width: 4px;
  border-radius: 50%;
  background: var(--et-faint);
  flex-shrink: 0;
  display: inline-block;
  transition: background 0.2s ease, transform 0.2s ease;
}

#elegant-toc .elegant-toc-link:hover .elegant-toc-bullet {
  background: var(--et-text);
}

#elegant-toc .elegant-toc-link.active .elegant-toc-bullet {
  background: var(--et-accent);
  transform: scale(1.5);
}

#elegant-toc .elegant-toc-text {
  flex: 1 1 auto;
  min-width: 0;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  display: block;
}

/* ---------- 缩进层级 ---------- */
#elegant-toc .elegant-toc-level-1 { padding-left: 0.75rem; }
#elegant-toc .elegant-toc-level-1 .elegant-toc-text { font-size: 0.9em; }

#elegant-toc .elegant-toc-level-2 { padding-left: 1.5rem; }
#elegant-toc .elegant-toc-level-2 .elegant-toc-text { font-size: 0.875em; color: var(--et-faint); }

#elegant-toc .elegant-toc-level-3 { padding-left: 2.25rem; }
#elegant-toc .elegant-toc-level-3 .elegant-toc-text { font-size: 0.85em; }

/* ---------- 深色模式 ---------- */
@media (prefers-color-scheme: dark) {
  #elegant-toc.elegant-toc {
    --et-accent: #f0f0f0;
    --et-accent-light: #c0c0c0;
    --et-border: #404040;
    --et-bg: #1a1a1a;
    --et-text: #f0f0f0;
    --et-muted: #c0c0c0;
    --et-faint: #9ca3af;
    --et-hover-bg: #2d2d2d;
    --et-active-bg: #333333;
  }
}

body.dark-mode #elegant-toc.elegant-toc,
body[data-theme="dark"] #elegant-toc.elegant-toc,
.dark #elegant-toc.elegant-toc,
html.dark #elegant-toc.elegant-toc {
  --et-accent: #f0f0f0;
  --et-accent-light: #c0c0c0;
  --et-border: #404040;
  --et-bg: #1a1a1a;
  --et-text: #f0f0f0;
  --et-muted: #c0c0c0;
  --et-faint: #9ca3af;
  --et-hover-bg: #2d2d2d;
  --et-active-bg: #333333;
}

/* ---------- 个性化色彩主题 ---------- */
#elegant-toc.elegant-toc.elegant-toc[data-et-theme="light"] {
  --et-accent: #1a1a1a;
  --et-accent-light: #666;
  --et-border: #e8e8e8;
  --et-bg: #fafafa;
  --et-text: #1a1a1a;
  --et-muted: #555;
  --et-faint: #999;
  --et-hover-bg: #f0f0f0;
  --et-active-bg: #f5f5f5;
}

#elegant-toc.elegant-toc.elegant-toc[data-et-theme="blue"] {
  --et-accent: #2563eb;
  --et-accent-light: #3b82f6;
  --et-border: #dbeafe;
  --et-bg: #eff6ff;
  --et-text: #1e3a8a;
  --et-muted: #475569;
  --et-faint: #60a5fa;
  --et-hover-bg: #dbeafe;
  --et-active-bg: #bfdbfe;
}

#elegant-toc.elegant-toc.elegant-toc[data-et-theme="green"] {
  --et-accent: #16a34a;
  --et-accent-light: #22c55e;
  --et-border: #dcfce7;
  --et-bg: #f0fdf4;
  --et-text: #14532d;
  --et-muted: #475569;
  --et-faint: #4ade80;
  --et-hover-bg: #dcfce7;
  --et-active-bg: #bbf7d0;
}

#elegant-toc.elegant-toc.elegant-toc[data-et-theme="purple"] {
  --et-accent: #9333ea;
  --et-accent-light: #a855f7;
  --et-border: #f3e8ff;
  --et-bg: #faf5ff;
  --et-text: #581c87;
  --et-muted: #475569;
  --et-faint: #c084fc;
  --et-hover-bg: #f3e8ff;
  --et-active-bg: #e9d5ff;
}

#elegant-toc.elegant-toc.elegant-toc[data-et-theme="orange"] {
  --et-accent: #ea580c;
  --et-accent-light: #f97316;
  --et-border: #ffedd5;
  --et-bg: #fff7ed;
  --et-text: #7c2d12;
  --et-muted: #475569;
  --et-faint: #fb923c;
  --et-hover-bg: #ffedd5;
  --et-active-bg: #fed7aa;
}

#elegant-toc.elegant-toc.elegant-toc[data-et-theme="dark"] {
  --et-accent: #f0f0f0;
  --et-accent-light: #c0c0c0;
  --et-border: #404040;
  --et-bg: #1a1a1a;
  --et-text: #f0f0f0;
  --et-muted: #c0c0c0;
  --et-faint: #9ca3af;
  --et-hover-bg: #2d2d2d;
  --et-active-bg: #333333;
}

/* ---------- 跳转目标闪烁 ---------- */
.elegant-toc-target-flash {
  animation: etFlash 1s ease;
}
@keyframes etFlash {
  0%   { background-color: rgba(0,0,0,0.06); }
  100% { background-color: transparent; }
}

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  #elegant-toc .elegant-toc-link,
  #elegant-toc .elegant-toc-toggle svg,
  #elegant-toc .elegant-toc-bullet,
  #elegant-toc .elegant-toc-trigger,
  #elegant-toc .elegant-toc-panel {
    transition: none;
  }
}