:root {
  color-scheme: dark;
  --bg: #0b1020;
  --line: rgba(148, 163, 184, 0.18);
  --text: #e5eefc;
  --muted: #94a3b8;
  --accent: #7dd3fc;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.32);
}
* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; background: radial-gradient(circle at top left, #15203a 0, #0b1020 34%, #090d17 100%); color: var(--text); font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.app-shell { display: grid; grid-template-columns: 320px 1fr; min-height: 100vh; }
.sidebar { position: sticky; top: 0; height: 100vh; overflow: auto; background: linear-gradient(180deg, rgba(8,12,24,.95), rgba(9,14,28,.88)); border-right: 1px solid var(--line); padding: 20px 16px; backdrop-filter: blur(16px); }
.brand { display: flex; align-items: center; gap: 12px; margin-bottom: 20px; }
.brand-mark { width: 42px; height: 42px; border-radius: 14px; display: grid; place-items: center; font-weight: 800; background: linear-gradient(135deg, #38bdf8, #8b5cf6); color: white; box-shadow: var(--shadow); }
.brand-title { font-weight: 700; letter-spacing: .2px; }
.brand-sub { color: var(--muted); font-size: 12px; margin-top: 2px; }
.sidebar-page-title { margin-bottom: 16px; padding-bottom: 14px; border-bottom: 1px solid var(--line); }
.sidebar-current { font-size: 18px; font-weight: 700; line-height: 1.2; margin-top: 8px; }
.parent-link { display: inline-block; color: var(--muted); font-size: 12px; margin-bottom: 4px; }
.empty-nav { color: var(--muted); font-size: 13px; padding: 8px 2px; }
.section-summary, .nav-summary { list-style: none; cursor: pointer; display: block; padding: 9px 12px; border-radius: 12px; color: var(--text); }
.section-summary::-webkit-details-marker, .nav-summary::-webkit-details-marker { display: none; }
.section-summary { font-weight: 700; font-size: 15px; }
.section-summary:hover, .nav-summary:hover { background: rgba(125, 211, 252, 0.10); }
.nav-label, .section-label { display: block; }
.nav-tree { font-size: 14px; }
.nav-node { margin: 4px 0; }
.nav-link { display: block; padding: 9px 12px; border-radius: 12px; color: var(--text); background: transparent; }
.nav-link:hover { background: rgba(125, 211, 252, 0.10); text-decoration: none; }
.nav-link.active, .nav-node.active > .section-summary, .nav-node.active > .nav-summary { background: linear-gradient(90deg, rgba(125,211,252,0.18), rgba(167,139,250,0.16)); border: 1px solid rgba(125,211,252,0.28); }
.nav-link.leaf { margin-left: 4px; }
.nav-children { margin-left: 14px; padding-left: 10px; border-left: 1px dashed rgba(148,163,184,0.18); }
.content { padding: 28px; overflow: auto; }
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 16px; color: var(--muted); font-size: 13px; }
.breadcrumbs a { color: var(--muted); }
.sep { margin: 0 8px; color: rgba(148,163,184,.5); }
.page-id { border: 1px solid var(--line); padding: 6px 10px; border-radius: 999px; background: rgba(15,23,42,.7); }
.page-card { max-width: 980px; margin: 0 auto; background: linear-gradient(180deg, rgba(15,23,42,.80), rgba(15,23,42,.60)); border: 1px solid var(--line); border-radius: 26px; box-shadow: var(--shadow); overflow: hidden; }
.page-header { padding: 32px 34px 18px; border-bottom: 1px solid var(--line); background: linear-gradient(135deg, rgba(56,189,248,0.08), rgba(167,139,250,0.10)); }
.page-header h1 { margin: 0; font-size: clamp(30px, 4vw, 48px); line-height: 1.06; letter-spacing: -.03em; }
.page-meta { margin-top: 10px; color: var(--muted); font-size: 13px; }
.page-body { padding: 26px 34px 38px; font-size: 16px; line-height: 1.8; }
.page-body h2, .page-body h3, .page-body h4 { margin: 28px 0 12px; line-height: 1.2; }
.page-body h2 { font-size: 28px; }
.page-body h3 { font-size: 22px; }
.page-body h4 { font-size: 18px; }
.page-body p { margin: 12px 0; color: #d8e3f4; }
.page-body blockquote { margin: 18px 0; padding: 14px 18px; border-left: 4px solid var(--accent); background: rgba(125, 211, 252, 0.08); border-radius: 14px; color: #eef6ff; }
.page-body hr { border: 0; border-top: 1px solid var(--line); margin: 26px 0; }
.page-body ul.notion-list, .page-body ol.notion-list { padding-left: 24px; margin: 12px 0; }
.page-body li { margin: 8px 0; }
.nested-blocks { margin-top: 8px; margin-bottom: 4px; }
.callout { display: flex; gap: 14px; align-items: flex-start; padding: 16px 18px; border: 1px solid rgba(125,211,252,.18); background: rgba(125,211,252,.07); border-radius: 18px; margin: 16px 0; }
.callout .emoji { font-size: 20px; }
.todo { display: inline-flex; align-items: center; gap: 10px; }
.code-block, pre { background: #050816; border: 1px solid rgba(148,163,184,.16); border-radius: 16px; overflow: auto; }
pre { padding: 16px 18px; }
code { font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace; font-size: .95em; }
.code-lang { color: var(--muted); font-size: 12px; margin: 0 0 8px 2px; }
.image-block { margin: 18px 0; }
.image-block img { max-width: 100%; border-radius: 18px; border: 1px solid var(--line); box-shadow: var(--shadow); }
.columns { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin: 18px 0; }
.column { min-width: 0; }
.child-page-card { display: block; margin: 12px 0; padding: 16px 18px; border-radius: 18px; border: 1px solid rgba(167,139,250,.18); background: rgba(167,139,250,.08); }
.child-page-card span { display: block; color: var(--muted); font-size: 12px; margin-bottom: 4px; }
.child-page-card strong { color: var(--text); font-size: 16px; }
.toggle { margin: 14px 0; }
.unsupported { color: #fca5a5; }
@media (max-width: 980px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { position: relative; height: auto; }
  .content { padding: 16px; }
}