:root {
  --md-toc-w: 280px;
  --md-toc-bg: var(--color-body, #fff);
  --md-toc-fg: var(--color-text, #24292f);
  --md-toc-muted: var(--color-text-light-2, #6e7781);
  --md-toc-border: var(--color-secondary-alpha, #d0d7de);
  --md-toc-active: var(--color-primary, #0969da);
  --md-toc-active-bg: var(--color-primary-alpha, rgba(9,105,218,0.08));
}

.theme-arc-green ~ .md-toc,
[data-theme="arc-green"] .md-toc {
  --md-toc-bg: var(--color-body, #1f2329);
  --md-toc-fg: var(--color-text, #d0d7de);
  --md-toc-muted: var(--color-text-light-2, #7a828c);
  --md-toc-border: var(--color-secondary-alpha, #2d333b);
  --md-toc-active: var(--color-primary, #4183c4);
  --md-toc-active-bg: var(--color-primary-alpha, rgba(65,131,196,0.15));
}

@media (prefers-color-scheme: dark) {
  :root:not(.theme-light) {
    --md-toc-bg: #1f2329;
    --md-toc-fg: #d0d7de;
    --md-toc-muted: #7a828c;
    --md-toc-border: #2d333b;
    --md-toc-active: #4183c4;
    --md-toc-active-bg: rgba(65,131,196,0.15);
  }
}

.md-toc-toggle {
  display: none;
  position: fixed;
  top: 80px;
  right: 20px;
  z-index: 1000;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  border: 1px solid var(--md-toc-border);
  background: var(--md-toc-bg);
  color: var(--md-toc-fg);
  font-size: 18px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  transition: all 0.2s;
}

.md-toc-toggle:hover {
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.md-toc-toggle.active {
  display: flex;
}

.md-toc.collapsed ~ .md-toc-toggle {
  display: flex;
}

.md-toc-toggle.active {
  display: flex;
}

.md-toc {
  position: fixed;
  top: 60px;
  right: 16px;
  width: var(--md-toc-w);
  max-height: calc(100vh - 80px);
  display: flex;
  flex-direction: column;
  z-index: 999;
  background: var(--md-toc-bg);
  border: 1px solid var(--md-toc-border);
  border-radius: 8px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.08);
  overflow: hidden;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.md-toc.collapsed {
  transform: translateX(calc(100% + 24px));
  opacity: 0;
  pointer-events: none;
}

.md-toc:not(.collapsed) ~ .md-toc-toggle {
  display: flex;
}

.md-toc-header {
  padding: 10px 16px;
  font-weight: 600;
  font-size: 14px;
  color: var(--md-toc-fg);
  border-bottom: 1px solid var(--md-toc-border);
  flex-shrink: 0;
  letter-spacing: 0.02em;
}

.md-toc-body {
  overflow-y: auto;
  padding: 8px 0;
  flex: 1;
  scrollbar-width: thin;
  scrollbar-color: var(--md-toc-border) transparent;
}

.md-toc-body::-webkit-scrollbar { width: 5px; }
.md-toc-body::-webkit-scrollbar-track { background: transparent; }
.md-toc-body::-webkit-scrollbar-thumb { background: var(--md-toc-border); border-radius: 3px; }

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

.md-toc-list .md-toc-list {
  margin-left: 14px;
}

.md-toc-item {
  margin: 0;
  padding: 0;
}

.md-toc-link {
  display: block;
  padding: 5px 16px;
  font-size: 13px;
  line-height: 1.4;
  color: var(--md-toc-muted);
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: all 0.15s;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.md-toc-link:hover {
  color: var(--md-toc-fg);
  background: var(--md-toc-active-bg);
  text-decoration: none;
}

.md-toc-item.active > .md-toc-link {
  color: var(--md-toc-active);
  border-left-color: var(--md-toc-active);
  background: var(--md-toc-active-bg);
  font-weight: 600;
}

.md-toc-level-1 .md-toc-link { font-size: 14px; font-weight: 500; }
.md-toc-level-2 .md-toc-link { font-size: 13px; padding-left: 28px; }
.md-toc-level-3 .md-toc-link { font-size: 12px; padding-left: 42px; }
.md-toc-level-4 .md-toc-link { font-size: 12px; padding-left: 56px; color: var(--md-toc-muted); opacity: 0.85; }
.md-toc-level-5 .md-toc-link { font-size: 11px; padding-left: 70px; opacity: 0.7; }
.md-toc-level-6 .md-toc-link { font-size: 11px; padding-left: 84px; opacity: 0.6; }

@media (max-width: 1280px) {
  .md-toc { width: 250px; }
  :root { --md-toc-w: 250px; }
}

@media (max-width: 1024px) {
  .md-toc { display: none; }
  .md-toc-toggle { display: none !important; }
}