:root {
  --bg: #0f172a; --card: #1e293b; --card-hover: #334155; --border: #334155;
  --accent: #3b82f6; --accent-light: #60a5fa; --accent-dim: #1e3a5f;
  --green: #22c55e; --green-dim: #14532d; --yellow: #eab308; --yellow-dim: #713f12;
  --red: #ef4444; --red-dim: #7f1d1d; --purple: #a855f7; --purple-dim: #581c87;
  --orange: #f97316; --orange-dim: #7c2d12; --cyan: #06b6d4; --cyan-dim: #164e63;
  --text: #f1f5f9; --text-dim: #94a3b8; --text-muted: #64748b;
  --emerald: #10b981;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif; background: var(--bg); color: var(--text); display: flex; height: 100vh; overflow: hidden; }

/* ═══════════════ Sidebar nav ═══════════════ */
nav { width: 240px; border-right: 1px solid var(--border); padding: 16px 10px; display: flex; flex-direction: column; gap: 2px; flex-shrink: 0; overflow-y: auto; }
.nav-brand { padding: 8px 14px; margin-bottom: 12px; }
.nav-brand h1 { font-weight: 800; font-size: 18px; color: var(--accent-light); letter-spacing: -0.5px; }
.nav-brand p { font-size: 11px; color: var(--text-muted); margin-top: 2px; }
.nav-btn { width: 100%; display: flex; align-items: center; gap: 10px; padding: 10px 14px; background: transparent; border: none; border-radius: 8px; color: var(--text-dim); cursor: pointer; text-align: left; font-size: 13px; font-weight: 500; transition: all 0.15s; }
.nav-btn:hover { background: var(--card); color: var(--text); }
.nav-btn.active { background: var(--accent-dim); color: var(--accent-light); }
.nav-btn svg { width: 16px; height: 16px; flex-shrink: 0; }
.nav-section { padding: 6px 14px; font-size: 10px; font-weight: 700; text-transform: uppercase; color: var(--text-muted); letter-spacing: 0.5px; margin-top: 10px; }
.nav-footer { margin-top: auto; padding: 10px 14px; font-size: 10px; color: var(--text-muted); border-top: 1px solid var(--border); }

/* ═══════════════ Main content ═══════════════ */
main { flex: 1; overflow-y: auto; padding: 28px; }
.view { display: none; }
.view.active { display: block; }

h2 { color: var(--text); font-size: 20px; font-weight: 700; margin-bottom: 4px; }
h3 { color: var(--text); font-size: 16px; font-weight: 600; margin-bottom: 10px; }
.subtitle { color: var(--text-dim); font-size: 13px; margin-bottom: 16px; }

.card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 20px; }
.badge { display: inline-block; padding: 2px 8px; border-radius: 9999px; font-size: 11px; font-weight: 600; white-space: nowrap; }

/* ═══════════════ Dashboard stats row ═══════════════ */
.stats-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 24px; }
.stats-row.stats-row-3 { grid-template-columns: repeat(3, 1fr); }
.stat-card { border-radius: 12px; padding: 18px; text-align: center; }
.stat-card .stat-num { font-size: 36px; font-weight: 800; }
.stat-card .stat-label { font-size: 12px; font-weight: 600; margin-top: 4px; }
.stat-total { background: var(--accent-dim); border: 1px solid rgba(59,130,246,0.3); }
.stat-total .stat-num { color: var(--accent-light); }
.stat-total .stat-label { color: var(--accent-light); opacity: 0.8; }
.stat-pass { background: var(--green-dim); border: 1px solid rgba(34,197,94,0.3); }
.stat-pass .stat-num { color: var(--green); }
.stat-pass .stat-label { color: var(--green); opacity: 0.8; }
.stat-partial { background: var(--purple-dim); border: 1px solid rgba(168,85,247,0.3); }
.stat-partial .stat-num { color: var(--purple); }
.stat-partial .stat-label { color: var(--purple); opacity: 0.8; }
.stat-gap { background: var(--yellow-dim); border: 1px solid rgba(234,179,8,0.3); }
.stat-gap .stat-num { color: var(--yellow); }
.stat-gap .stat-label { color: var(--yellow); opacity: 0.8; }

/* ═══════════════ Item cards ═══════════════ */
.items-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 12px; }
.item-card { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 14px; cursor: pointer; text-align: left; width: 100%; transition: all 0.15s; border-left-width: 3px; border-left-style: solid; }
.item-card:hover { border-color: var(--text-muted); background: var(--card-hover); }
.item-card.cat-tools { border-left-color: var(--accent); }
.item-card.cat-stack { border-left-color: var(--cyan); }
.item-card.cat-design { border-left-color: var(--green); }
.item-card .name { font-weight: 700; font-size: 14px; margin-bottom: 4px; }
.item-card .tag { display: inline-block; padding: 2px 8px; border-radius: 9999px; font-size: 10px; font-weight: 600; background: var(--bg); color: var(--text-dim); margin-bottom: 8px; }
.item-card .desc { color: var(--text-dim); font-size: 12px; line-height: 1.5; max-height: 0; overflow: hidden; transition: max-height 0.3s ease, margin-top 0.3s ease, padding-top 0.3s ease; }
.item-card.expanded .desc { max-height: 1200px; margin-top: 8px; padding-top: 10px; border-top: 1px solid var(--border); }
.item-card .expand-hint { color: var(--text-muted); font-size: 10px; margin-top: 6px; letter-spacing: 0.3px; text-transform: uppercase; }
.item-card.expanded .expand-hint { display: none; }

/* ═══════════════ Knowledge level bar ═══════════════ */
.level-row { display: flex; align-items: center; gap: 8px; margin: 8px 0 2px; }
.level-bar { flex: 1; height: 5px; background: var(--border); border-radius: 3px; overflow: hidden; }
.level-fill { height: 100%; border-radius: 3px; transition: width 0.5s ease; }
.level-pct { font-size: 11px; font-weight: 700; min-width: 34px; text-align: right; letter-spacing: 0.2px; }
.item-card.cat-tools .level-fill { background: linear-gradient(90deg, var(--accent), var(--accent-light)); }
.item-card.cat-tools .level-pct { color: var(--accent-light); }
.item-card.cat-stack .level-fill { background: linear-gradient(90deg, var(--cyan), #67e8f9); }
.item-card.cat-stack .level-pct { color: var(--cyan); }
.item-card.cat-design .level-fill { background: linear-gradient(90deg, var(--green), #86efac); }
.item-card.cat-design .level-pct { color: var(--green); }

/* ═══════════════ Mirror indicator (JS/TS parallel stack) ═══════════════ */
.item-card.mirror { border-left-color: var(--yellow) !important; background: linear-gradient(to right, rgba(234,179,8,0.03), var(--card) 30%); }
.mirror-badge { display: inline-block; font-size: 9px; font-weight: 800; letter-spacing: 0.8px; padding: 2px 6px; border-radius: 3px; background: var(--yellow-dim); color: var(--yellow); margin-left: 6px; text-transform: uppercase; }
.mirror-of { font-size: 11px; color: var(--yellow); margin-top: 4px; font-style: italic; }
.mirror-of::before { content: '🪞 '; }

/* ═══════════════ Knowledge bullets (expanded) ═══════════════ */
.knows-label { font-size: 10px; text-transform: uppercase; letter-spacing: 0.6px; color: var(--text-muted); margin: 10px 0 6px; font-weight: 700; }
.knows-list { list-style: none; padding: 0; margin: 0; }
.knows-list li { font-size: 12px; color: var(--text-dim); padding: 3px 0 3px 14px; position: relative; line-height: 1.5; }
.knows-list li::before { content: '▸'; position: absolute; left: 0; color: var(--text-muted); font-size: 10px; top: 4px; }

/* ═══════════════ Refresher (concepts + snippets) ═══════════════ */
.refresh-label { font-size: 10px; text-transform: uppercase; letter-spacing: 0.6px; color: var(--accent-light); margin: 12px 0 6px; font-weight: 700; }
.refresh-concept { font-size: 12px; color: var(--text-dim); line-height: 1.5; padding: 4px 0 4px 14px; position: relative; }
.refresh-concept::before { content: '💡'; position: absolute; left: -2px; top: 3px; font-size: 10px; }
.refresh-snippet { font-size: 11.5px; font-family: 'Consolas', 'Monaco', 'Courier New', monospace; color: var(--text); background: var(--bg); border-left: 2px solid var(--accent); padding: 6px 10px; border-radius: 0 4px 4px 0; margin: 4px 0; white-space: pre-wrap; word-break: break-word; }

/* ═══════════════ Sub-sections, search, misc ═══════════════ */
.sub-section { margin-bottom: 24px; }
.sub-section:last-child { margin-bottom: 0; }

.filter-bar { display: flex; gap: 6px; margin-bottom: 16px; flex-wrap: wrap; align-items: center; }
.search-input { flex: 1; min-width: 200px; background: var(--card); border: 1px solid var(--border); color: var(--text); padding: 7px 12px; border-radius: 999px; font-size: 12px; outline: none; transition: border-color 0.15s; }
.search-input:focus { border-color: var(--accent); }
.search-input::placeholder { color: var(--text-muted); }

.empty-state { text-align: center; padding: 40px; color: var(--text-muted); font-size: 13px; }
.hidden { display: none !important; }

.note-banner { border-left: 3px solid var(--yellow); background: linear-gradient(to right, #713f1222, transparent); padding: 14px 16px; border-radius: 8px; margin-bottom: 16px; }
.note-banner h3 { margin: 0 0 4px; color: var(--yellow); font-size: 14px; }
.note-banner p { color: var(--text-dim); font-size: 12px; }

/* ═══════════════════════════════════════════════════════════════════
   Custom scrollbars — subtle, rounded, theme-aware
   ═══════════════════════════════════════════════════════════════════ */
/* Firefox */
* { scrollbar-width: thin; scrollbar-color: rgba(148,163,184,0.22) transparent; }
nav, main { scrollbar-gutter: stable; }

/* WebKit / Blink */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: rgba(148,163,184,0.18);
  border-radius: 10px;
  border: 2px solid transparent;
  background-clip: padding-box;
  transition: background 0.15s;
}
::-webkit-scrollbar-thumb:hover { background: rgba(148,163,184,0.38); background-clip: padding-box; }
::-webkit-scrollbar-corner { background: transparent; }

/* ═══════════════════════════════════════════════════════════════════
   Top toolbar — back / home / breadcrumb
   ═══════════════════════════════════════════════════════════════════ */
.view-toolbar {
  display: flex; align-items: center; gap: 8px;
  margin: 0 0 18px;
  min-height: 14px;
}
.view-toolbar:empty,
.view-toolbar.is-empty { display: none; }
.back-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 7px 12px; border-radius: 8px; cursor: pointer;
  background: var(--card); border: 1px solid var(--border); color: var(--text-dim);
  font: inherit; font-size: 12.5px; font-weight: 600;
  transition: color 0.15s, background 0.15s, border-color 0.15s, transform 0.1s;
}
.back-btn svg { width: 14px; height: 14px; }
.back-btn:hover {
  background: var(--card-hover); color: var(--text); border-color: var(--text-muted);
}
.back-btn:active { transform: translateY(1px); }
.back-btn-home:hover { color: var(--accent-light); border-color: rgba(59,130,246,0.35); }
.view-breadcrumb {
  font-size: 12px; color: var(--text-muted); font-weight: 600;
  margin-left: 4px;
}
.view-breadcrumb:not(:empty)::before {
  content: '/'; margin-right: 8px; color: var(--text-muted); opacity: 0.6;
}

/* ═══════════════════════════════════════════════════════════════════
   HOME / DASHBOARD — hero, learning, sections, feature cards
   ═══════════════════════════════════════════════════════════════════ */

body { background:
  radial-gradient(1200px 700px at 85% -10%, rgba(59,130,246,0.10), transparent 60%),
  radial-gradient(900px 600px at -10% 100%, rgba(6,182,212,0.08), transparent 60%),
  var(--bg);
}

main { padding: 32px 36px 56px; }

.home .home-section { margin-top: 28px; }
.home .home-section:first-of-type { margin-top: 0; }

.section-head {
  display: flex; align-items: flex-end; justify-content: space-between;
  gap: 12px; margin-bottom: 14px; flex-wrap: wrap;
}
.section-title { font-size: 17px; font-weight: 700; color: var(--text); margin: 0 0 2px; letter-spacing: -0.2px; }
.section-sub { font-size: 12px; color: var(--text-dim); margin: 0; }
.section-pill {
  font-size: 10px; font-weight: 700; letter-spacing: 0.6px; text-transform: uppercase;
  color: var(--accent-light); background: var(--accent-dim);
  padding: 5px 10px; border-radius: 9999px; border: 1px solid rgba(59,130,246,0.25);
}

/* ── HERO ────────────────────────────────────────────────────────── */
.hero {
  position: relative; overflow: hidden;
  border: 1px solid var(--border); border-radius: 20px;
  padding: 32px 32px 30px; margin-bottom: 8px;
  background:
    linear-gradient(135deg, rgba(59,130,246,0.12), rgba(168,85,247,0.06) 45%, rgba(6,182,212,0.08)) ,
    linear-gradient(180deg, #1a2236, #131a2a);
  box-shadow:
    0 1px 0 rgba(255,255,255,0.03) inset,
    0 20px 60px -20px rgba(0,0,0,0.6);
}
.hero-bg {
  position: absolute; inset: -20% -10% auto auto; width: 520px; height: 520px;
  background:
    radial-gradient(closest-side, rgba(59,130,246,0.35), transparent 70%),
    radial-gradient(closest-side at 70% 60%, rgba(168,85,247,0.18), transparent 75%);
  filter: blur(10px); pointer-events: none; z-index: 0;
  animation: heroFloat 14s ease-in-out infinite alternate;
}
@keyframes heroFloat {
  0%   { transform: translate3d(0,0,0) scale(1); }
  100% { transform: translate3d(-20px,10px,0) scale(1.05); }
}
.hero-inner {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: auto 1fr; gap: 24px; align-items: center;
}

.hero-avatar {
  position: relative;
  width: 108px; height: 108px; border-radius: 26px;
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 800; font-size: 40px; letter-spacing: -1px;
  background: linear-gradient(135deg, var(--accent) 0%, #7c3aed 60%, var(--cyan) 120%);
  box-shadow:
    0 18px 40px -10px rgba(59,130,246,0.55),
    0 0 0 1px rgba(255,255,255,0.06) inset;
  flex-shrink: 0;
}
.hero-avatar span { text-shadow: 0 2px 12px rgba(0,0,0,0.35); }
.hero-avatar-status {
  position: absolute; right: -2px; bottom: -2px;
  width: 22px; height: 22px; border-radius: 50%;
  background: var(--green);
  border: 3px solid #131a2a;
  box-shadow: 0 0 0 2px rgba(34,197,94,0.35), 0 0 14px rgba(34,197,94,0.6);
}

.hero-text { min-width: 0; }
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 11px; font-weight: 700; letter-spacing: 0.8px; text-transform: uppercase;
  color: var(--green);
  background: rgba(34,197,94,0.08); border: 1px solid rgba(34,197,94,0.25);
  padding: 5px 10px; border-radius: 9999px; margin-bottom: 12px;
}
.hero-dot {
  width: 7px; height: 7px; border-radius: 50%; background: var(--green);
  box-shadow: 0 0 0 3px rgba(34,197,94,0.25);
  animation: pulse 2.2s ease-in-out infinite;
}
@keyframes pulse {
  0%,100% { box-shadow: 0 0 0 3px rgba(34,197,94,0.25); }
  50%     { box-shadow: 0 0 0 6px rgba(34,197,94,0.08); }
}

.hero-name {
  font-size: 40px; font-weight: 800; letter-spacing: -1px; line-height: 1.05;
  color: var(--text);
  background: linear-gradient(120deg, #fff 10%, #93c5fd 60%, #67e8f9 95%);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
  margin-bottom: 8px;
}
.hero-role {
  font-size: 14px; font-weight: 600; color: var(--accent-light);
  margin-bottom: 10px;
}
.hero-tagline {
  font-size: 14px; line-height: 1.6; color: var(--text-dim);
  max-width: 640px; margin-bottom: 16px;
}

.hero-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.hero-chip {
  font-size: 11.5px; font-weight: 600; padding: 6px 12px; border-radius: 9999px;
  background: rgba(255,255,255,0.03); border: 1px solid var(--border); color: var(--text-dim);
}
.hero-chip.chip-primary { color: var(--accent-light); border-color: rgba(59,130,246,0.3); background: rgba(59,130,246,0.08); }
.hero-chip.chip-mirror  { color: var(--yellow);       border-color: rgba(234,179,8,0.3);  background: rgba(234,179,8,0.08); }
.hero-chip.chip-infra   { color: var(--cyan);         border-color: rgba(6,182,212,0.3);  background: rgba(6,182,212,0.08); }

.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 16px; border-radius: 10px;
  font-size: 13px; font-weight: 600; text-decoration: none;
  cursor: pointer; border: 1px solid transparent;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s;
}
.btn svg { width: 15px; height: 15px; }
.btn-primary {
  background: linear-gradient(135deg, var(--accent), #2563eb);
  color: #fff;
  box-shadow: 0 10px 24px -10px rgba(59,130,246,0.6);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 14px 28px -10px rgba(59,130,246,0.7); }
.btn-ghost {
  background: rgba(255,255,255,0.03); color: var(--text); border-color: var(--border);
}
.btn-ghost:hover { background: var(--card-hover); border-color: var(--text-muted); }

/* ── CURRENTLY LEARNING ──────────────────────────────────────────── */
.learning-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 12px;
}
.learning-item {
  background: var(--card); border: 1px solid var(--border); border-radius: 12px;
  padding: 16px; position: relative; overflow: hidden;
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
  font: inherit; color: inherit; text-align: left; cursor: pointer; width: 100%;
  display: flex; flex-direction: column;
}
.learning-cta {
  margin-top: auto; padding-top: 10px;
  font-size: 12px; font-weight: 700; color: var(--accent-light);
}
.learning-item::before {
  content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
  background: linear-gradient(180deg, var(--accent), var(--cyan));
}
.learning-item:hover { transform: translateY(-1px); border-color: var(--text-muted); box-shadow: 0 10px 24px -14px rgba(0,0,0,0.6); }
.learning-head {
  display: flex; justify-content: space-between; align-items: center; gap: 8px;
  margin-bottom: 6px;
}
.learning-head strong { font-size: 13.5px; color: var(--text); }
.learning-stage {
  font-size: 9.5px; font-weight: 800; letter-spacing: 0.7px; text-transform: uppercase;
  padding: 3px 8px; border-radius: 9999px; white-space: nowrap;
}
.learning-stage.stage-progress { color: var(--accent-light); background: var(--accent-dim); }
.learning-stage.stage-queued   { color: var(--yellow); background: var(--yellow-dim); }
.learning-item p { font-size: 12px; color: var(--text-dim); line-height: 1.55; margin-bottom: 10px; }

.level-fill.fill-accent { background: linear-gradient(90deg, var(--accent), var(--accent-light)); }
.level-fill.fill-cyan   { background: linear-gradient(90deg, var(--cyan), #67e8f9); }
.level-fill.fill-yellow { background: linear-gradient(90deg, var(--yellow), #fde047); }

/* ── FEATURE CARDS ───────────────────────────────────────────────── */
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 12px; }
.feature-card {
  background: var(--card); border: 1px solid var(--border); border-radius: 14px;
  padding: 20px; text-align: left; color: var(--text); cursor: pointer;
  font: inherit; position: relative; overflow: hidden;
  transition: transform 0.15s ease, border-color 0.15s, box-shadow 0.2s;
  display: flex; flex-direction: column; gap: 8px;
}
.feature-card:hover { transform: translateY(-2px); border-color: var(--text-muted); box-shadow: 0 18px 36px -20px rgba(0,0,0,0.7); }
.feature-icon {
  width: 40px; height: 40px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 6px;
}
.feature-icon svg { width: 20px; height: 20px; }
.feature-card h4 { font-size: 15px; font-weight: 700; margin: 0; }
.feature-card p  { font-size: 12.5px; line-height: 1.55; color: var(--text-dim); margin: 0; }
.feature-cta { margin-top: 6px; font-size: 12px; font-weight: 700; }

.feature-card.feat-tools  .feature-icon { background: var(--accent-dim); color: var(--accent-light); }
.feature-card.feat-tools  .feature-cta  { color: var(--accent-light); }
.feature-card.feat-stack  .feature-icon { background: var(--cyan-dim); color: var(--cyan); }
.feature-card.feat-stack  .feature-cta  { color: var(--cyan); }
.feature-card.feat-design .feature-icon { background: var(--green-dim); color: var(--green); }
.feature-card.feat-design .feature-cta  { color: var(--green); }

/* ── Stats / cards: soften on home ────────────────────────────────── */
.home .stat-card { padding: 20px 18px; border-radius: 14px; }
.home .stat-card .stat-num { font-size: 34px; }
.home .card { border-radius: 14px; }

/* ── Responsive ───────────────────────────────────────────────────── */
@media (max-width: 820px) {
  .hero { padding: 24px; }
  .hero-inner { grid-template-columns: 1fr; gap: 16px; }
  .hero-avatar { width: 84px; height: 84px; font-size: 32px; border-radius: 20px; }
  .hero-name { font-size: 30px; }
  main { padding: 20px; }
}

/* ═══════════════════════════════════════════════════════════════════
   Full-flow diagrams — SVG figures (architecture + sequence)
   ═══════════════════════════════════════════════════════════════════ */
.flow-figure {
  margin: 0 0 18px;
  padding: 18px;
  background:
    radial-gradient(900px 500px at 90% 0%, rgba(59,130,246,0.06), transparent 60%),
    var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
}
.flow-caption {
  font-size: 11px; font-weight: 800; letter-spacing: 0.8px; text-transform: uppercase;
  color: var(--text-muted); margin-bottom: 12px;
}
.flow-svg {
  display: block; width: 100%; height: auto;
}
.flow-svg text { font-family: 'Inter', 'Segoe UI', system-ui, sans-serif; }

/* ═══════════════════════════════════════════════════════════════════
   Legacy HTML-flow-diagram styles (kept for compatibility with
   non-SVG renderers; unused by the current Full Flow view).
   ═══════════════════════════════════════════════════════════════════ */
.flow-diagram {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(240px, 1fr);
  gap: 24px;
  margin: 8px 0 20px;
  padding: 20px;
  background:
    radial-gradient(800px 500px at 90% 0%, rgba(59,130,246,0.06), transparent 60%),
    var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
}
.flow-col { display: flex; flex-direction: column; gap: 10px; }
.flow-col-side { padding-top: 0; }
.flow-side-label {
  font-size: 10px; font-weight: 800; letter-spacing: 0.8px;
  text-transform: uppercase; color: var(--text-muted); margin-bottom: 4px;
}

.flow-node {
  display: flex; gap: 12px; align-items: center;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  position: relative;
}
.flow-node .node-icon {
  width: 34px; height: 34px; border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.flow-node .node-icon svg { width: 18px; height: 18px; }
.flow-node .node-body { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.flow-node .node-body strong { font-size: 13px; color: var(--text); }
.flow-node .node-body small  { font-size: 11.5px; color: var(--text-dim); line-height: 1.45; }
.flow-node .side-wire {
  margin-top: 4px; font-size: 10.5px; font-weight: 600;
  color: var(--text-muted); letter-spacing: 0.2px;
}

/* Node color variants */
.node-client  { border-left: 3px solid var(--accent); }
.node-client  .node-icon { background: var(--accent-dim); color: var(--accent-light); }
.node-infra   { border-left: 3px solid var(--text-muted); }
.node-infra   .node-icon { background: rgba(148,163,184,0.15); color: var(--text-dim); }
.node-cache   { border-left: 3px solid var(--purple); }
.node-cache   .node-icon { background: var(--purple-dim); color: var(--purple); }
.node-db      { border-left: 3px solid var(--cyan); }
.node-db      .node-icon { background: var(--cyan-dim); color: var(--cyan); }
.node-worker  { border-left: 3px solid var(--green); }
.node-worker  .node-icon { background: var(--green-dim); color: var(--green); }
.node-obs     { border-left: 3px solid var(--yellow); }
.node-obs     .node-icon { background: var(--yellow-dim); color: var(--yellow); }

/* Vertical arrow between main-column nodes */
.flow-arrow {
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  color: var(--text-muted);
  position: relative; padding: 2px 0;
}
.flow-arrow::before,
.flow-arrow::after {
  content: ''; display: block;
  width: 2px; background: var(--border);
}
.flow-arrow::before { height: 14px; }
.flow-arrow::after  {
  height: 0; width: 0;
  border-left: 5px solid transparent; border-right: 5px solid transparent;
  border-top: 7px solid var(--border);
}
.flow-arrow-label {
  font-size: 10.5px; font-weight: 600; color: var(--text-muted);
  padding: 3px 10px; border: 1px dashed var(--border);
  border-radius: 999px; background: var(--card);
  white-space: nowrap;
}

/* FastAPI app container — layered sublayers */
.flow-app {
  background: linear-gradient(180deg, rgba(59,130,246,0.05), rgba(6,182,212,0.04));
  border: 1px solid rgba(59,130,246,0.25);
  border-radius: 12px; overflow: hidden;
}
.flow-app-title {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: 10px 14px;
  background: rgba(59,130,246,0.10);
  color: var(--accent-light); font-weight: 800; font-size: 13px;
  border-bottom: 1px solid rgba(59,130,246,0.2);
}
.flow-app-sub { font-weight: 500; font-size: 11px; color: var(--text-dim); letter-spacing: 0.3px; }
.flow-layer {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 14px;
  border-top: 1px solid rgba(59,130,246,0.15);
}
.flow-layer:first-of-type { border-top: 0; }
.flow-layer .layer-tag {
  font-size: 10px; font-weight: 800; letter-spacing: 0.6px; text-transform: uppercase;
  min-width: 130px; white-space: nowrap;
}
.flow-layer .layer-desc { font-size: 12px; color: var(--text-dim); line-height: 1.5; }
.flow-layer code {
  font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
  font-size: 11.5px; padding: 2px 8px; border-radius: 4px;
  background: var(--bg); color: var(--cyan);
  border: 1px solid rgba(6,182,212,0.15);
}
.flow-layer .layer-pills { display: flex; gap: 6px; flex-wrap: wrap; }
.flow-layer .pill {
  font-size: 11px; font-weight: 600; padding: 3px 8px; border-radius: 999px;
  background: var(--bg); border: 1px solid var(--border); color: var(--text-dim);
}
.layer-middleware .layer-tag { color: var(--yellow); }
.layer-endpoint   .layer-tag { color: var(--accent-light); }
.layer-schema     .layer-tag { color: var(--cyan); }
.layer-service    .layer-tag { color: var(--purple); }
.layer-repo       .layer-tag { color: var(--green); }
.layer-model      .layer-tag { color: #fb923c; }

/* Legend */
.flow-legend {
  display: flex; flex-wrap: wrap; gap: 14px;
  padding: 10px 14px; margin-bottom: 20px;
  font-size: 11.5px; color: var(--text-dim);
  border: 1px solid var(--border); border-radius: 10px;
  background: var(--card);
}
.flow-legend span { display: inline-flex; align-items: center; gap: 6px; }
.sw { width: 10px; height: 10px; border-radius: 3px; display: inline-block; }
.sw-client    { background: var(--accent); }
.sw-infra     { background: var(--text-muted); }
.sw-mw        { background: var(--yellow); }
.sw-endpoint  { background: var(--accent-light); }
.sw-schema    { background: var(--cyan); }
.sw-service   { background: var(--purple); }
.sw-repo      { background: var(--green); }
.sw-model     { background: #fb923c; }
.sw-db        { background: var(--cyan); }
.sw-cache     { background: var(--purple); }
.sw-worker    { background: var(--green); }
.sw-obs       { background: var(--yellow); }
.sw-app       { background: linear-gradient(135deg, var(--accent), var(--cyan)); }
.legend-dashed {
  color: var(--green); font-weight: 600;
  letter-spacing: 0.3px;
}

/* Responsive: stack columns on narrow screens */
@media (max-width: 900px) {
  .flow-diagram { grid-template-columns: 1fr; }
  .flow-layer { flex-direction: column; align-items: flex-start; gap: 4px; }
  .flow-layer .layer-tag { min-width: 0; }
}

/* ═══════════════════════════════════════════════════════════════════
   Learning doc rendering — prose, headings, tables
   ═══════════════════════════════════════════════════════════════════ */
.learning-doc {
  font-size: 13.5px; line-height: 1.65; color: var(--text);
  max-width: 1100px;
}
.learning-doc .learning-heading {
  font-size: 15px; font-weight: 700; color: var(--accent-light);
  margin: 24px 0 10px; letter-spacing: -0.1px;
  padding-bottom: 6px; border-bottom: 1px solid var(--border);
}
.learning-doc .learning-heading:first-child { margin-top: 0; }

.learning-doc .learning-para {
  color: var(--text-dim); margin: 8px 0;
}
.learning-doc .learning-list {
  list-style: none; padding: 0; margin: 8px 0 12px;
}
.learning-doc .learning-list li {
  position: relative; padding: 3px 0 3px 18px; color: var(--text-dim);
}
.learning-doc .learning-list li::before {
  content: '▸'; position: absolute; left: 2px; top: 3px;
  color: var(--accent); font-size: 11px;
}
.learning-doc code {
  font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
  font-size: 0.9em; padding: 1px 6px; border-radius: 4px;
  background: rgba(255,255,255,0.04); color: var(--cyan);
  border: 1px solid rgba(6,182,212,0.12);
}
.learning-doc strong { color: var(--text); font-weight: 700; }

/* Tables inside learning docs */
.learning-table-wrap {
  overflow-x: auto; margin: 12px 0 20px;
  border: 1px solid var(--border); border-radius: 10px;
  background: var(--card);
}
.learning-table {
  width: 100%; border-collapse: collapse; font-size: 12.5px;
}
.learning-table thead th {
  text-align: left; padding: 10px 14px;
  background: rgba(59,130,246,0.08);
  color: var(--accent-light); font-weight: 700;
  font-size: 11px; text-transform: uppercase; letter-spacing: 0.5px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.learning-table tbody td {
  padding: 10px 14px; vertical-align: top;
  border-top: 1px solid var(--border);
  color: var(--text-dim); line-height: 1.55;
}
.learning-table tbody tr:first-child td { border-top: 0; }
.learning-table tbody tr:hover { background: rgba(255,255,255,0.02); }
.learning-table tbody td:first-child { color: var(--text); font-weight: 600; white-space: nowrap; }
.learning-table tbody td code { white-space: normal; }