/* --- Theme --- */
:root {
  --bg: #0b0d12;
  --panel: #111520;
  --panel-2: #0e1220;
  --text: #e6e9ef;
  --muted: #9aa4b2;
  --brand: #5b9cff;
  --border: #202633;
  --shadow: 0 10px 30px rgba(0,0,0,.35);
  --radius: 16px;
}
@media (prefers-color-scheme: light) {
  :root { --bg: #f6f7fb; --panel:#ffffff; --panel-2:#f3f5f9; --text:#0d1220; --muted:#5b6676; --border:#e7eaf0; }
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0; background: radial-gradient(1200px 900px at 20% -10%, rgba(91,156,255,.08), transparent 60%), var(--bg);
  color: var(--text); font: 14px/1.45 system-ui, -apple-system, Segoe UI, Roboto, Inter, "Helvetica Neue", Arial, "Apple Color Emoji", "Segoe UI Emoji";
}
.app { display: grid; grid-template-columns: 280px 1fr; height: 100dvh; overflow: hidden; }
/* Sidebar */
.sidebar { border-right: 1px solid var(--border); background: linear-gradient(180deg, var(--panel), var(--panel-2)); padding: 12px; overflow: auto; }
.brand { display: flex; align-items: center; gap: 10px; padding: 10px; border-radius: 12px; background: linear-gradient(180deg, rgba(91,156,255,.10), rgba(91,156,255,.04)); margin-bottom: 8px; }
.brand b{ font-size: 16px }
.muted { color: var(--muted); }
.row { display: flex; align-items: center; gap: 8px; }
.search { position: sticky; top: 0; background: inherit; padding: 8px 0 10px; z-index: 2; }
.search input { width: 100%; padding: 10px 12px; border-radius: 12px; border: 1px solid var(--border); background: var(--panel-2); color: var(--text); outline: none; }
.search input::placeholder{ color: var(--muted); }
.cat { margin: 12px 0; }
.cat-header { cursor: pointer; user-select: none; padding: 10px 12px; border-radius: 12px; display: flex; align-items: center; justify-content: space-between; border: 1px solid var(--border); background: rgba(255,255,255,.02); }
.cat-title { display: flex; align-items: flex-start; gap: 10px; }
.cat-name { font-weight: 600; }
.cat-desc { margin-top: 2px; color: var(--muted); font-size: 12px; }
.pages { margin-top: 8px; display: grid; gap: 6px; padding-left: 6px; }
.page-link { text-decoration: none; color: inherit; padding: 10px; border: 1px solid var(--border); border-radius: 12px; display: grid; grid-template-columns: 28px 1fr; gap: 10px; align-items: center; background: var(--panel-2); }
.page-link:hover{ border-color: rgba(91,156,255,.6); box-shadow: var(--shadow); }
.page-emoji { font-size: 18px; line-height: 1; text-align: center; }
.page-meta { display: grid; gap: 4px; }
.page-title { font-weight: 600; }
.page-desc { color: var(--muted); font-size: 12px; }
/* Main */
.main { position: relative; overflow: hidden; }
.topbar { display: none; align-items: center; justify-content: space-between; gap: 8px; padding: 12px 14px; border-bottom: 1px solid var(--border); background: linear-gradient(180deg, rgba(255,255,255,.02), transparent); }
.btn { appearance: none; border: 1px solid var(--border); background: var(--panel); color: var(--text); border-radius: 12px; padding: 10px 12px; cursor: pointer; }
.btn:hover { border-color: rgba(91,156,255,.6); }
.content { height: 100%; display: grid; grid-template-rows: auto 1fr; position: relative; }
.welcome { padding: 18px; display: grid; gap: 8px; border-bottom: 1px dashed var(--border); }
.grid { padding: 14px; overflow: auto; }
.hint { color: var(--muted); font-size: 12px; }
/* Page viewer */
.viewer { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; background: #fff; display: none; }
.viewer.active { display: block; }
/* Mobile */
.menu-toggle { display: none; }
@media (max-width: 1024px) {
  .app { grid-template-columns: 1fr; }
  .sidebar { position: fixed; inset: 0 30% 0 0; max-width: 420px; transform: translateX(-100%); transition: transform .25s ease; z-index: 10; box-shadow: 30px 0 80px rgba(0,0,0,.4); }
  .sidebar.open { transform: translateX(0); }
  .menu-toggle { display: inline-flex; align-items: center; gap: 8px; }
  .backdrop { display:none; position: fixed; inset: 0; background: rgba(0,0,0,.4); z-index: 9; }
  .backdrop.show { display:block; }
}