/* Shared wiki sidebar — polished foldable learning path */
:root {
  --ew-nav-w: 280px;
  --ew-nav-green: #059669;
  --ew-nav-amber: #d97706;
  --ew-nav-violet: #6d28d9;
  --ew-nav-violet-2: #a855f7;
  --ew-nav-text: #0f172a;
  --ew-nav-muted: #64748b;
  --ew-nav-line: #e5e7eb;
  --ew-nav-panel: #ffffff;
  --ew-nav-soft: #f7f8ff;
}

.ew-wiki-shell {
  display: grid;
  grid-template-columns: var(--ew-nav-w) minmax(0, 1fr);
  gap: 32px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 18px 18px 48px;
  align-items: start;
}
.ew-wiki-shell > .ew-wiki-main { min-width: 0; }
.ew-wiki-shell > .ew-wiki-main > .wrap,
.ew-wiki-shell > .ew-wiki-main > main.wrap,
.ew-wiki-shell > .ew-wiki-main > main {
  max-width: 880px;
  margin-left: 0;
  margin-right: 0;
  padding-left: 0;
  padding-right: 0;
}
.ew-wiki-shell > .ew-wiki-main > footer.site {
  max-width: 880px;
  margin-top: 8px;
  padding: 16px 0 24px;
}

aside.ew-wiki-nav {
  position: sticky;
  top: 72px;
  max-height: calc(100dvh - 88px);
  overflow: auto;
  background: var(--ew-nav-panel);
  border: 1px solid var(--ew-nav-line);
  border-radius: 18px;
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.06);
  padding: 0 0 14px;
  font-family: Inter, system-ui, -apple-system, sans-serif;
  z-index: 20;
  scrollbar-width: thin;
  scrollbar-color: #d4d4d8 transparent;
}
aside.ew-wiki-nav::-webkit-scrollbar { width: 6px; }
aside.ew-wiki-nav::-webkit-scrollbar-thumb {
  background: #d4d4d8;
  border-radius: 99px;
}

/* Brand header */
.ew-wiki-nav .ew-nav-brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 16px 16px 14px;
  text-decoration: none;
  border-bottom: 1px solid var(--ew-nav-line);
  background:
    radial-gradient(420px 120px at 100% 0%, rgba(168, 85, 247, 0.14), transparent 70%),
    linear-gradient(180deg, #faf8ff, #fff);
  border-radius: 18px 18px 0 0;
  margin-bottom: 6px;
}
.ew-wiki-nav .ew-nav-brand:hover { text-decoration: none; }
.ew-wiki-nav .ew-nav-brand-kicker {
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ew-nav-violet);
}
.ew-wiki-nav .ew-nav-brand-sub {
  font-size: 12px;
  font-weight: 500;
  color: var(--ew-nav-muted);
}

.ew-wiki-nav .ew-nav-label {
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ew-nav-muted);
  padding: 12px 16px 6px;
}
.ew-wiki-nav hr {
  border: none;
  border-top: 1px solid var(--ew-nav-line);
  margin: 10px 14px;
}

/* Quick links */
.ew-wiki-nav a.ew-nav-link {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 1px 8px;
  padding: 8px 10px;
  border-radius: 10px;
  color: var(--ew-nav-text);
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  line-height: 1.3;
}
.ew-wiki-nav a.ew-nav-link:hover { background: var(--ew-nav-soft); }
.ew-wiki-nav a.ew-nav-link.active {
  background: linear-gradient(90deg, rgba(109, 40, 217, 0.12), transparent);
  font-weight: 700;
  color: var(--ew-nav-violet);
}
.ew-wiki-nav a.ew-nav-featured {
  position: relative;
  padding-right: 28px;
  font-weight: 600;
  background: rgba(109, 40, 217, 0.05);
}
.ew-wiki-nav a.ew-nav-featured::after {
  content: "★★";
  position: absolute;
  top: 8px;
  right: 10px;
  font-size: 10px;
  letter-spacing: 1px;
  color: var(--ew-nav-violet-2);
  opacity: 0.8;
  pointer-events: none;
}

/* Level groups */
.ew-wiki-nav .ew-nav-levels {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 0 8px;
}
.ew-wiki-nav details.ew-nav-group {
  margin: 0;
  border: 1px solid transparent;
  border-radius: 12px;
  background: transparent;
  overflow: hidden;
  transition: background 0.15s ease, border-color 0.15s ease;
}
.ew-wiki-nav details.ew-nav-group[open] {
  background: var(--ew-nav-soft);
  border-color: #ebe4ff;
}
.ew-wiki-nav details.ew-nav-group.level-b[open] {
  background: #f0fdf8;
  border-color: #bbf7d0;
}
.ew-wiki-nav details.ew-nav-group.level-i[open] {
  background: #fffbeb;
  border-color: #fde68a;
}
.ew-wiki-nav details.ew-nav-group.level-a[open] {
  background: #f5f3ff;
  border-color: #ddd6fe;
}
.ew-wiki-nav details.ew-nav-group.level-t[open] {
  background: #f8fafc;
  border-color: #e2e8f0;
}

.ew-wiki-nav details.ew-nav-group summary {
  list-style: none;
  cursor: pointer;
  padding: 10px 10px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
  user-select: none;
}
.ew-wiki-nav details.ew-nav-group summary::-webkit-details-marker { display: none; }
.ew-wiki-nav details.ew-nav-group summary:hover {
  background: rgba(255, 255, 255, 0.55);
}

.ew-wiki-nav .ew-nav-lvl-badge {
  flex: 0 0 auto;
  width: 26px;
  height: 26px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 800;
  color: #fff;
  background: #94a3b8;
}
.ew-wiki-nav details.level-b .ew-nav-lvl-badge { background: var(--ew-nav-green); }
.ew-wiki-nav details.level-i .ew-nav-lvl-badge { background: var(--ew-nav-amber); }
.ew-wiki-nav details.level-a .ew-nav-lvl-badge { background: var(--ew-nav-violet); }
.ew-wiki-nav details.level-t .ew-nav-lvl-badge {
  background: #334155;
  font-size: 11px;
}

.ew-wiki-nav .ew-nav-lvl-copy {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 1px;
}
.ew-wiki-nav .ew-nav-lvl-title {
  font-size: 13.5px;
  font-weight: 800;
  color: var(--ew-nav-text);
  line-height: 1.2;
}
.ew-wiki-nav .ew-nav-lvl-meta {
  font-size: 11px;
  font-weight: 500;
  color: var(--ew-nav-muted);
}
.ew-wiki-nav details.ew-nav-group.has-active .ew-nav-lvl-title {
  color: inherit;
}
.ew-wiki-nav details.level-b.has-active .ew-nav-lvl-title { color: var(--ew-nav-green); }
.ew-wiki-nav details.level-i.has-active .ew-nav-lvl-title { color: var(--ew-nav-amber); }
.ew-wiki-nav details.level-a.has-active .ew-nav-lvl-title { color: var(--ew-nav-violet); }

.ew-wiki-nav .ew-nav-chevron {
  flex: 0 0 auto;
  width: 20px;
  height: 20px;
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--ew-nav-muted);
  background: rgba(255, 255, 255, 0.7);
  transition: transform 0.18s ease;
}
.ew-wiki-nav .ew-nav-chevron svg {
  width: 12px;
  height: 12px;
  display: block;
}
.ew-wiki-nav details.ew-nav-group[open] .ew-nav-chevron {
  transform: rotate(90deg);
  color: var(--ew-nav-text);
}

/* Article links */
.ew-wiki-nav .ew-nav-children {
  padding: 0 8px 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.ew-wiki-nav .ew-nav-children a {
  display: block;
  position: relative;
  padding: 7px 10px 7px 14px;
  border-radius: 9px;
  color: #334155;
  font-size: 12.5px;
  font-weight: 500;
  text-decoration: none;
  line-height: 1.35;
  border-left: 2px solid transparent;
}
.ew-wiki-nav .ew-nav-children a:hover {
  background: rgba(255, 255, 255, 0.85);
  color: var(--ew-nav-text);
}
.ew-wiki-nav details.level-b .ew-nav-children a:hover { border-left-color: #6ee7b7; }
.ew-wiki-nav details.level-i .ew-nav-children a:hover { border-left-color: #fcd34d; }
.ew-wiki-nav details.level-a .ew-nav-children a:hover { border-left-color: #c4b5fd; }

.ew-wiki-nav .ew-nav-children a.active {
  background: #fff;
  font-weight: 700;
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.06);
}
.ew-wiki-nav details.level-b .ew-nav-children a.active {
  color: var(--ew-nav-green);
  border-left-color: var(--ew-nav-green);
}
.ew-wiki-nav details.level-i .ew-nav-children a.active {
  color: #b45309;
  border-left-color: var(--ew-nav-amber);
}
.ew-wiki-nav details.level-a .ew-nav-children a.active {
  color: var(--ew-nav-violet);
  border-left-color: var(--ew-nav-violet);
}

/* Ticker chips */
.ew-wiki-nav .ew-nav-chips {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
  padding: 0 10px 12px;
}
.ew-wiki-nav .ew-nav-chips a {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 7px 4px;
  border-radius: 8px;
  border: 1px solid var(--ew-nav-line);
  background: #fff;
  color: #334155;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  line-height: 1;
}
.ew-wiki-nav .ew-nav-chips a:hover {
  border-color: #c4b5fd;
  color: var(--ew-nav-violet);
  background: #faf8ff;
}
.ew-wiki-nav .ew-nav-chips a.active {
  border-color: var(--ew-nav-violet);
  background: rgba(109, 40, 217, 0.08);
  color: var(--ew-nav-violet);
}
.ew-wiki-nav .ew-nav-chips a.wide {
  grid-column: span 3;
  font-weight: 600;
  letter-spacing: 0;
  justify-content: flex-start;
  padding-left: 10px;
  color: #475569;
}

/* Mobile */
.ew-nav-toggle {
  display: none;
  position: fixed;
  bottom: 18px;
  left: 18px;
  z-index: 60;
  border: none;
  border-radius: 999px;
  padding: 12px 16px;
  font-weight: 700;
  font-size: 13px;
  font-family: inherit;
  color: #fff;
  background: linear-gradient(135deg, #7c3aed, #a855f7);
  box-shadow: 0 10px 24px rgba(124, 58, 237, 0.35);
  cursor: pointer;
}
.ew-nav-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.4);
  z-index: 45;
}

@media (max-width: 960px) {
  .ew-wiki-shell {
    grid-template-columns: 1fr;
    padding: 12px 14px 72px;
  }
  .ew-nav-toggle { display: inline-flex; align-items: center; gap: 6px; }
  aside.ew-wiki-nav {
    position: fixed;
    inset: 0 auto 0 0;
    width: min(88vw, 310px);
    max-height: 100dvh;
    top: 0;
    border-radius: 0 18px 18px 0;
    z-index: 55;
    transform: translateX(-105%);
    transition: transform 0.22s ease;
  }
  body.ew-nav-open aside.ew-wiki-nav { transform: translateX(0); }
  body.ew-nav-open .ew-nav-backdrop { display: block; }
}