:root {
  --bg: #f5f5f5;
  --surface: #ffffff;
  --sidebar: #ededed;
  --text: #171717;
  --muted: #6f6f6f;
  --faint: #a3a3a3;
  --border: #d9d9d9;
  --hover: #e3e3e3;
  --accent: #171717;
  --accent-soft: rgba(0, 0, 0, .08);
  --code: #ebebeb;
  --shadow: 0 18px 60px rgba(0, 0, 0, .16);
  color-scheme: light;
}

:root[data-theme="dark"] {
  --bg: #000000;
  --surface: #070707;
  --sidebar: #000000;
  --text: #f5f5f5;
  --muted: #a3a3a3;
  --faint: #666666;
  --border: #242424;
  --hover: #121212;
  --accent: #ffffff;
  --accent-soft: rgba(255, 255, 255, .10);
  --code: #090909;
  --shadow: 0 22px 70px rgba(0, 0, 0, .8);
  color-scheme: dark;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { width: 100%; height: 100dvh; min-height: 100dvh; max-height: 100dvh; overflow: hidden; }
html { background: var(--bg); }
body { margin: 0; color: var(--text); background: var(--bg); font: 15px/1.65 Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
.app-shell { position: relative; width: 100%; height: 100%; overflow: hidden; }
.sidebar { position: fixed; inset: 0 auto 0 0; z-index: 20; display: flex; width: 288px; height: 100%; flex-direction: column; border-right: 1px solid var(--border); background: var(--sidebar); }
.brand-row { display: flex; align-items: center; min-height: 64px; padding: 13px 16px; }
.brand-copy { display: flex; min-width: 0; flex: 1; flex-direction: column; line-height: 1.2; }
.brand-copy strong { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 14px; }
.sidebar-actions { display: flex; gap: 7px; padding: 5px 12px 13px; border-bottom: 1px solid var(--border); }
.action-button, .icon-button, .key-button { border: 0; color: var(--muted); background: transparent; cursor: pointer; }
.action-button { display: grid; width: 36px; height: 36px; flex: 0 0 auto; place-items: center; padding: 0; border-radius: 7px; }
.action-button:hover, .icon-button:hover, .key-button:hover { color: var(--text); background: var(--hover); }
.icon-button { display: grid; width: 36px; height: 36px; flex: 0 0 auto; place-items: center; border-radius: 7px; }
.page-tree { flex: 1; overflow: auto; padding: 12px 9px 24px; scrollbar-width: thin; }
.tree-group { margin: 1px 0; }
.tree-children { margin-left: 12px; padding-left: 8px; border-left: 1px solid var(--border); }
.tree-link { display: flex; width: 100%; min-height: 33px; align-items: center; gap: 7px; padding: 5px 9px; border: 0; border-radius: 6px; color: var(--muted); background: transparent; cursor: pointer; text-align: left; }
.tree-link:hover { color: var(--text); background: var(--hover); }
.tree-link.active { color: var(--text); background: var(--accent-soft); font-weight: 600; }
.tree-number { min-width: 26px; color: var(--faint); font: 10px ui-monospace, monospace; }
.tree-title { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.update-status { display: flex; min-height: 48px; align-items: center; gap: 9px; padding: 0 17px; border-top: 1px solid var(--border); color: var(--muted); font-size: 11px; }
.update-status i { width: 7px; height: 7px; border-radius: 50%; background: #55a96b; box-shadow: 0 0 0 3px rgba(85, 169, 107, .11); }
.update-status.syncing i { background: #d8a441; animation: pulse 1s infinite; }
.update-status.error i { background: #d75b5b; }
@keyframes pulse { 50% { opacity: .35; } }
.workspace { height: 100%; min-height: 0; margin-left: 288px; overflow-x: hidden; overflow-y: auto; overscroll-behavior-y: contain; scroll-behavior: smooth; -webkit-overflow-scrolling: touch; }
.topbar { position: sticky; top: 0; z-index: 10; display: flex; min-height: 58px; align-items: center; gap: 10px; padding: 0 30px; border-bottom: 1px solid color-mix(in srgb, var(--border), transparent 18%); background: color-mix(in srgb, var(--bg), transparent 7%); backdrop-filter: blur(16px); }
.breadcrumbs { min-width: 0; flex: 1; overflow: hidden; color: var(--muted); text-overflow: ellipsis; white-space: nowrap; font-size: 12px; }
.breadcrumbs span + span::before { margin: 0 8px; color: var(--faint); content: "/"; }
.header-actions { display: flex; max-width: 55%; align-items: center; }
.header-buttons { display: flex; align-items: center; gap: 8px; overflow-x: auto; scrollbar-width: none; }
.header-buttons::-webkit-scrollbar { display: none; }
.header-link { padding: 5px 10px; border: 1px solid var(--border); border-radius: 7px; color: var(--muted); text-decoration: none; font-size: 12px; }
.header-link:hover { color: var(--text); border-color: var(--faint); background: var(--surface); }
.header-link.active { color: var(--accent); border-color: color-mix(in srgb, var(--accent), transparent 45%); background: var(--accent-soft); }
.content { width: min(820px, calc(100% - 64px)); min-height: calc(100dvh - 180px); margin: 0 auto; padding: 62px 0 70px; outline: none; }
.content > :first-child { margin-top: 0; }
.content h1 { margin: 0 0 1.4rem; font-size: clamp(2rem, 5vw, 3.1rem); line-height: 1.1; letter-spacing: -.04em; }
.content h2 { margin: 2.4rem 0 .75rem; padding-bottom: .35rem; border-bottom: 1px solid var(--border); font-size: 1.55rem; letter-spacing: -.02em; }
.content h3 { margin: 1.8rem 0 .5rem; font-size: 1.15rem; }
.content p { margin: .7rem 0 1rem; }
.content a { color: var(--accent); text-underline-offset: 3px; }
.content img { display: block; max-width: 100%; height: auto; margin: 1.35rem auto; border-radius: 8px; box-shadow: 0 7px 25px rgba(0, 0, 0, .12); }
.content figure { margin: 1.5rem 0; }
.content figure img { margin-bottom: .55rem; }
.content figcaption { color: var(--muted); text-align: center; font-size: 12px; }
.content pre { overflow: auto; margin: 1.2rem 0; padding: 17px 19px; border: 1px solid var(--border); border-radius: 9px; background: var(--code); line-height: 1.55; }
.content code { padding: .12em .32em; border-radius: 4px; background: var(--code); font: .88em/1.5 "SFMono-Regular", Consolas, monospace; }
.content pre code { padding: 0; background: transparent; }
.content blockquote { margin: 1.3rem 0; padding: .3rem 1.2rem; border-left: 3px solid var(--accent); color: var(--muted); }
.content blockquote footer { font-size: 12px; }
.content hr { margin: 2.5rem 0; border: 0; border-top: 1px solid var(--border); }
.content details { margin: 1rem 0; padding: .8rem 1rem; border: 1px solid var(--border); border-radius: 8px; background: var(--surface); }
.content summary { cursor: pointer; font-weight: 650; }
.callout { margin: 1.25rem 0; padding: 13px 16px; border: 1px solid color-mix(in srgb, var(--accent), transparent 68%); border-left: 4px solid var(--accent); border-radius: 7px; background: var(--accent-soft); }
.callout strong { display: block; margin-bottom: 3px; }
.badge { display: inline-block; padding: 1px 7px; border-radius: 999px; color: var(--accent); background: var(--accent-soft); font-size: .8em; font-weight: 700; }
.table-wrap { overflow-x: auto; margin: 1.2rem 0; }
.content table { width: 100%; border-collapse: collapse; }
.content th, .content td { padding: 9px 12px; border: 1px solid var(--border); text-align: left; }
.content th { background: var(--sidebar); font-size: 12px; }
.page-navigation { display: grid; width: min(820px, calc(100% - 64px)); grid-template-columns: 1fr 1fr; gap: 14px; margin: 0 auto; padding: 0 0 58px; }
.nav-card { min-height: 66px; padding: 11px 15px; border: 1px solid var(--border); border-radius: 9px; color: var(--muted); background: var(--surface); cursor: pointer; text-align: left; }
.nav-card:last-child { text-align: right; }
.nav-card:hover:not(:disabled) { color: var(--text); border-color: var(--accent); transform: translateY(-1px); }
.nav-card:disabled { visibility: hidden; }
.nav-card small { display: block; margin-bottom: 2px; color: var(--faint); font-size: 10px; text-transform: uppercase; letter-spacing: .08em; }
.search-dialog { width: min(650px, calc(100% - 28px)); max-height: min(650px, calc(100dvh - 40px)); margin-top: 9dvh; padding: 0; border: 1px solid var(--border); border-radius: 12px; color: var(--text); background: var(--surface); box-shadow: var(--shadow); }
.search-dialog::backdrop { background: rgba(0, 0, 0, .38); backdrop-filter: blur(2px); }
.search-box { display: flex; align-items: center; gap: 9px; padding: 11px; border-bottom: 1px solid var(--border); }
.search-box label { display: flex; flex: 1; align-items: center; gap: 9px; }
.search-box input { width: 100%; border: 0; outline: 0; color: var(--text); background: transparent; }
.key-button { padding: 4px 7px; border: 1px solid var(--border); border-radius: 5px; font-size: 10px; }
.search-results { max-height: 480px; overflow: auto; padding: 7px; }
.search-result { display: block; width: 100%; padding: 10px 12px; border: 0; border-radius: 7px; color: var(--text); background: transparent; cursor: pointer; text-align: left; }
.search-result:hover, .search-result:focus { outline: 0; background: var(--hover); }
.search-result strong { display: block; }
.search-result span { display: block; overflow: hidden; margin-top: 3px; color: var(--muted); text-overflow: ellipsis; white-space: nowrap; font-size: 12px; }
.empty-state { padding: 48px 20px; color: var(--muted); text-align: center; }
.sidebar-overlay, .actions-overlay, .mobile-only { display: none; }

@media (max-width: 800px) {
  .mobile-only { display: grid; }
  .sidebar { transform: translateX(-102%); transition: transform .22s ease; box-shadow: var(--shadow); }
  body.sidebar-open .sidebar { transform: none; }
  .sidebar-overlay, .actions-overlay { position: fixed; inset: 0; z-index: 15; background: rgba(0, 0, 0, .58); }
  body.sidebar-open .sidebar-overlay { display: block; }
  .header-actions { position: fixed; inset: 0 0 0 auto; z-index: 30; display: flex; width: min(88vw, 420px); max-width: none; height: 100dvh; flex-direction: column; align-items: stretch; padding: max(12px, env(safe-area-inset-top)) max(12px, env(safe-area-inset-right)) max(12px, env(safe-area-inset-bottom)) 12px; border-left: 1px solid var(--border); background: var(--sidebar); box-shadow: var(--shadow); transform: translateX(102%); transition: transform .22s ease; }
  body.actions-open .header-actions { transform: none; }
  body.actions-open .actions-overlay { display: block; }
  .actions-close { align-self: flex-end; margin-bottom: 8px; }
  .header-buttons { flex: 1; flex-direction: column; align-items: stretch; gap: 6px; overflow-y: auto; }
  .header-link { width: 100%; padding: 11px 13px; border-color: transparent; font-size: 14px; }
  .workspace { margin-left: 0; }
  .topbar { padding: 0 14px; }
  .content, .page-navigation { width: min(100% - 34px, 820px); }
  .content { padding-top: 42px; }
}

@media print {
  .sidebar, .topbar, .page-navigation { display: none; }
  .workspace { margin: 0; }
  .content { width: 100%; padding: 0; }
}