*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --sidebar-w: 268px;
  --bg:        #0f172a;
  --bg2:       #1e293b;
  --bg3:       #111827;
  --bg4:       #0d1526;
  --border:    rgba(51,65,85,.8);
  --border2:   rgba(51,65,85,.4);
  --text:      #e2e8f0;
  --text2:     #94a3b8;
  --text3:     #475569;
  --accent:    #7c3aed;
  --accent2:   #a78bfa;
  --accent-bg: rgba(124,58,237,.15);
  --accent-brd:rgba(124,58,237,.3);
  --success:   #22c55e;
  --danger:    #ef4444;
  --warn:      #f59e0b;
  --gold:      #f59e0b;
  --sidebar-bg: #0d1117;
  --sidebar-brd: rgba(124,58,237,.15);
  --sidebar-active-bg: rgba(124,58,237,.18);
  --sidebar-active: #a78bfa;
  --sidebar-hover: rgba(255,255,255,.04);
  --content-bg: #0f172a;
  --code-bg:   #1e293b;
}

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--text); font-size: 15px; line-height: 1.7;
  background: #0f172a;
}

body::before {
  content: '';
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    radial-gradient(ellipse 80rem 50rem at 10% 0%, rgba(124,58,237,.09) 0%, transparent 60%),
    radial-gradient(ellipse 60rem 40rem at 90% 100%, rgba(109,40,217,.07) 0%, transparent 60%),
    linear-gradient(rgba(124,58,237,.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124,58,237,.03) 1px, transparent 1px);
  background-size: auto, auto, 40px 40px, 40px 40px;
  mask-image: radial-gradient(ellipse 100% 100% at 50% 50%, #000 30%, transparent 100%);
}

.app { position: relative; z-index: 1; }

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(124,58,237,.3); border-radius: 3px; }

/* ── Layout ── */
.app { display: flex; height: 100vh; overflow: hidden; }

/* ── Sidebar ── */
.sidebar {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  background: var(--sidebar-bg);
  border-right: 1px solid var(--sidebar-brd);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  z-index: 100;
}

.sidebar-header { padding: 20px 16px 14px; border-bottom: 1px solid var(--sidebar-brd); flex-shrink: 0; }

.sidebar-logo { display: flex; align-items: center; gap: 10px; text-decoration: none; margin-bottom: 14px; }
.sidebar-logo-icon {
  width: 30px; height: 30px;
  background: linear-gradient(135deg, #7c3aed, #4f46e5);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: 16px; flex-shrink: 0;
  box-shadow: 0 0 12px rgba(124,58,237,.4);
}
.sidebar-logo-name { font-size: 14px; font-weight: 800; color: var(--text); letter-spacing: -.01em; }

.search-box {
  display: flex; align-items: center; gap: 8px;
  background: rgba(124,58,237,.08);
  border: 1px solid var(--sidebar-brd);
  border-radius: 8px; padding: 7px 10px; cursor: pointer;
  transition: border-color .15s, background .15s;
}
.search-box:hover { border-color: var(--accent-brd); background: rgba(124,58,237,.12); }
.search-box svg { color: var(--text3); flex-shrink: 0; }
.search-box input { background: none; border: none; outline: none; color: var(--text2); font-size: 12px; flex: 1; cursor: pointer; }
.search-kbd { font-size: 10px; background: rgba(255,255,255,.06); border: 1px solid var(--border2); border-radius: 4px; padding: 1px 5px; color: var(--text3); }

.sidebar-nav { flex: 1; overflow-y: auto; padding: 6px 0 16px; }

.nav-section { padding: 18px 14px 4px; }
.nav-section-title {
  font-size: 10px; font-weight: 700; letter-spacing: .1em;
  text-transform: uppercase; color: var(--text3);
  display: flex; align-items: center; gap: 6px;
}
.nav-section-icon { font-size: 12px; }

.nav-item {
  display: flex; align-items: center; gap: 8px;
  padding: 6px 14px; font-size: 13px;
  color: var(--text2); text-decoration: none;
  cursor: pointer; transition: background .1s, color .1s;
  position: relative; border-left: 2px solid transparent;
}
.nav-item:hover { background: var(--sidebar-hover); color: var(--text); }
.nav-item.active {
  background: var(--sidebar-active-bg); color: var(--sidebar-active);
  font-weight: 600; border-left-color: var(--accent);
}

.nav-children { padding-left: 14px; }
.nav-children .nav-item { font-size: 12.5px; padding: 5px 14px; }

.sidebar-footer { padding: 12px 14px; border-top: 1px solid var(--sidebar-brd); font-size: 11px; color: var(--text3); flex-shrink: 0; }

/* ── Main ── */
.main { flex: 1; display: flex; flex-direction: column; overflow: hidden; }

.topbar {
  height: 48px; border-bottom: 1px solid var(--border2);
  display: flex; align-items: center; padding: 0 32px; gap: 8px;
  flex-shrink: 0; background: var(--bg4);
}

.breadcrumb { display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--text3); }
.breadcrumb a { color: var(--text3); text-decoration: none; }
.breadcrumb a:hover { color: var(--accent2); }
.breadcrumb-sep { color: var(--text3); }

.topbar-actions { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.btn-admin {
  font-size: 12px; padding: 5px 12px;
  background: var(--accent-bg); color: var(--accent2);
  border: 1px solid var(--accent-brd); border-radius: 6px;
  text-decoration: none; cursor: pointer; transition: background .15s;
  font-weight: 600;
}
.btn-admin:hover { background: rgba(124,58,237,.25); }

.hamburger { display: none; background: none; border: none; color: var(--text2); cursor: pointer; padding: 4px; }

.content-wrap { flex: 1; overflow-y: auto; padding: 52px 72px; max-width: 880px; width: 100%; margin: 0 auto; }

/* ── Loading ── */
.loading-page { display: flex; align-items: center; justify-content: center; height: 100%; color: var(--text2); gap: 12px; }
.spinner { width: 24px; height: 24px; border: 2px solid rgba(124,58,237,.2); border-top-color: var(--accent); border-radius: 50%; animation: spin .6s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Typography ── */
.page-content h1 { font-size: 2rem; font-weight: 800; margin-bottom: 24px; color: var(--text); line-height: 1.2; letter-spacing: -.02em; }
.page-content h2 { font-size: 1.4rem; font-weight: 700; margin: 40px 0 14px; padding-bottom: 10px; border-bottom: 1px solid var(--border2); color: var(--text); }
.page-content h3 { font-size: 1.15rem; font-weight: 600; margin: 28px 0 10px; color: var(--text); }
.page-content h4 { font-size: 1rem; font-weight: 600; margin: 20px 0 8px; color: var(--text2); }
.page-content p { margin-bottom: 16px; color: var(--text); }
.page-content a { color: var(--accent2); text-decoration: none; border-bottom: 1px solid rgba(167,139,250,.3); transition: border-color .15s; }
.page-content a:hover { border-bottom-color: var(--accent2); }
.page-content ul, .page-content ol { margin: 12px 0 16px 24px; }
.page-content li { margin-bottom: 6px; }
.page-content li input[type=checkbox] { margin-right: 6px; accent-color: var(--accent); }
.page-content strong { color: var(--text); font-weight: 700; }
.page-content em { color: var(--text2); }
.page-content del { color: var(--text3); }

.page-content blockquote {
  border-left: 3px solid var(--accent);
  padding: 12px 18px;
  background: var(--accent-bg);
  border-radius: 0 8px 8px 0;
  margin: 20px 0; color: var(--text2);
}

/* Callout boxes */
.page-content blockquote p:first-child strong:first-child { color: var(--accent2); }

.page-content code {
  background: rgba(124,58,237,.12);
  border: 1px solid rgba(124,58,237,.2);
  padding: 2px 7px; border-radius: 5px;
  font-family: 'Fira Code', 'Cascadia Code', monospace;
  font-size: 13px; color: #c4b5fd;
}
.page-content pre {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: 10px; padding: 18px 22px;
  overflow-x: auto; margin: 18px 0; position: relative;
}
.page-content pre code { background: none; border: none; padding: 0; color: var(--text); font-size: 13.5px; }
.page-content table { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 14px; }
.page-content th { background: var(--bg2); padding: 10px 14px; text-align: left; font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; color: var(--text2); border: 1px solid var(--border); }
.page-content td { padding: 10px 14px; border: 1px solid var(--border2); }
.page-content tr:hover td { background: rgba(255,255,255,.02); }
.page-content img { max-width: 100%; border-radius: 10px; margin: 12px 0; border: 1px solid var(--border2); }
.page-content hr { border: none; border-top: 1px solid var(--border); margin: 36px 0; }

/* Hint/Callout boxes via HTML in markdown */
.hint { padding: 14px 18px; border-radius: 10px; margin: 20px 0; border-left: 4px solid; }
.hint-info    { background: rgba(79,110,247,.1); border-color: #4f6ef7; }
.hint-warning { background: rgba(245,158,11,.1); border-color: var(--warn); }
.hint-danger  { background: rgba(239,68,68,.1);  border-color: var(--danger); }
.hint-success { background: rgba(34,197,94,.1);  border-color: var(--success); }

/* ── Prev/Next ── */
.page-nav { display: flex; gap: 16px; margin-top: 72px; padding-top: 32px; border-top: 1px solid var(--border2); }
.page-nav-btn {
  flex: 1; display: flex; flex-direction: column; gap: 4px;
  padding: 16px 20px;
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: 10px; text-decoration: none; color: var(--text);
  transition: border-color .15s, background .15s;
}
.page-nav-btn:hover { border-color: var(--accent-brd); background: var(--accent-bg); }
.page-nav-btn.next { text-align: right; }
.page-nav-label { font-size: 11px; color: var(--text3); text-transform: uppercase; letter-spacing: .07em; font-weight: 700; }
.page-nav-title { font-size: 14px; font-weight: 600; color: var(--accent2); }

/* ── Search Overlay ── */
.search-overlay { display: none; position: fixed; inset: 0; z-index: 1000; background: rgba(0,0,0,.65); backdrop-filter: blur(6px); align-items: flex-start; justify-content: center; padding-top: 80px; }
.search-overlay.open { display: flex; }
.search-modal { background: var(--bg2); border: 1px solid var(--accent-brd); border-radius: 14px; width: 100%; max-width: 560px; overflow: hidden; box-shadow: 0 20px 60px rgba(0,0,0,.5), 0 0 0 1px rgba(124,58,237,.2); }
.search-input-wrap { display: flex; align-items: center; gap: 10px; padding: 14px 16px; border-bottom: 1px solid var(--border); }
.search-input-wrap svg { color: var(--accent2); }
.search-input-wrap input { flex: 1; background: none; border: none; outline: none; font-size: 16px; color: var(--text); }
.search-results { max-height: 380px; overflow-y: auto; }
.search-result-item { display: block; padding: 12px 16px; text-decoration: none; color: var(--text); border-bottom: 1px solid var(--border2); transition: background .1s; }
.search-result-item:hover { background: var(--accent-bg); }
.search-result-title { font-size: 14px; font-weight: 600; margin-bottom: 3px; color: var(--accent2); }
.search-result-excerpt { font-size: 12px; color: var(--text2); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.search-empty { padding: 28px 16px; text-align: center; color: var(--text3); font-size: 13px; }

/* ── 404 ── */
.not-found { text-align: center; padding: 80px 32px; }
.not-found h1 { font-size: 72px; font-weight: 900; background: linear-gradient(135deg, var(--accent), var(--accent2)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.not-found p { color: var(--text2); margin: 16px 0 24px; }
.not-found a { color: var(--accent2); }

/* ── Mobile ── */
@media (max-width: 768px) {
  .hamburger { display: flex; }
  .sidebar { position: fixed; left: -280px; top: 0; bottom: 0; transition: left .25s; z-index: 200; }
  .sidebar.open { left: 0; box-shadow: 4px 0 30px rgba(0,0,0,.6); }
  .content-wrap { padding: 32px 20px; }
}