/* ============================================================
   VizLearn — Main Stylesheet
   Author: Adewale Samson Adeagbo
   ============================================================ */

:root {
  --bg:        #0b0f1a;
  --bg2:       #111827;
  --bg3:       #1a2236;
  --surface:   #1e2a3a;
  --border:    #2a3a52;
  --accent:    #00e5a0;
  --accent2:   #00b4d8;
  --accent3:   #f4a261;
  --text:      #e8f0fe;
  --text-muted:#8b9ab5;
  --text-dim:  #4a5a7a;
  --danger:    #ef4444;
  --warning:   #f59e0b;
  --success:   #10b981;
  --radius:    12px;
  --radius-lg: 20px;
  --shadow:    0 4px 24px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 48px rgba(0,0,0,0.6);
  --font-head: 'Syne', sans-serif;
  --font-body: 'DM Sans', sans-serif;
  --font-mono: 'DM Mono', monospace;
  --transition: 0.25s cubic-bezier(0.4,0,0.2,1);
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; }

/* ── SCROLLBAR ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg2); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

/* ── CONTAINER ── */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ══════════════════════════════════════
   NAVBAR
══════════════════════════════════════ */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(11,15,26,0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}
.navbar.scrolled { background: rgba(11,15,26,0.97); }

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-head);
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  flex-shrink: 0;
}
.brand-icon { font-size: 1.4rem; color: var(--accent); }
.accent { color: var(--accent); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}
.nav-links a {
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: var(--transition);
}
.nav-links a:hover, .nav-links a.active {
  color: var(--text);
  background: var(--surface);
}
.nav-links a.active { color: var(--accent); }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

/* ══════════════════════════════════════
   HERO
══════════════════════════════════════ */
.hero {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 48px;
  padding: 100px 48px 60px;
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
}

.hero-bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,229,160,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,229,160,0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
  z-index: -1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(0,229,160,0.08);
  border: 1px solid rgba(0,229,160,0.2);
  color: var(--accent);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.3px;
  margin-bottom: 24px;
}

.hero-title {
  font-family: var(--font-head);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -2px;
  margin-bottom: 20px;
}
.hero-title-accent {
  color: var(--accent);
  position: relative;
}
.hero-title-accent::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), transparent);
  border-radius: 2px;
}

.hero-sub {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 480px;
  line-height: 1.75;
  margin-bottom: 32px;
}

.hero-cta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  text-decoration: none;
}
.btn-primary {
  background: var(--accent);
  color: var(--bg);
}
.btn-primary:hover {
  background: #00ffb3;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,229,160,0.35);
}
.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}
.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover {
  background: var(--bg3);
  border-color: var(--accent2);
  color: var(--accent2);
}
.btn-danger {
  background: var(--danger);
  color: #fff;
}
.btn-sm { padding: 7px 14px; font-size: 0.8rem; }
.btn-full { width: 100%; justify-content: center; }

.hero-stats {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.stat { display: flex; flex-direction: column; align-items: center; }
.stat-num {
  font-family: var(--font-head);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
}
.stat-label {
  font-size: 0.7rem;
  color: var(--text-dim);
  letter-spacing: 1px;
  text-transform: uppercase;
}
.stat-sep { color: var(--border); font-size: 1.4rem; }

/* Code Mockup */
.code-mockup {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  animation: float 4s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-8px); }
}

.mockup-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 12px 16px;
  background: var(--bg3);
  border-bottom: 1px solid var(--border);
}
.dot {
  width: 12px; height: 12px;
  border-radius: 50%;
}
.dot.red { background: #ff5f57; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #28c840; }
.mockup-title {
  margin-left: 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.mockup-code {
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.8;
  color: #c9d1d9;
  overflow-x: auto;
}
.mockup-code .kw  { color: #ff7b72; }
.mockup-code .str { color: #a5d6ff; }
.mockup-code .cm  { color: #6e7681; font-style: italic; }

.mockup-run {
  padding: 10px 16px;
  background: rgba(0,229,160,0.08);
  border-top: 1px solid rgba(0,229,160,0.15);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  cursor: pointer;
  transition: var(--transition);
}
.mockup-run:hover { background: rgba(0,229,160,0.15); }

/* ══════════════════════════════════════
   SECTIONS
══════════════════════════════════════ */
.section {
  padding: 96px 0;
}
.section--dark {
  background: var(--bg2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 12px;
}
.section-title {
  font-family: var(--font-head);
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 48px;
  line-height: 1.15;
}

/* ── FEATURES GRID ── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.feature-card--large {
  grid-column: span 2;
}

.feature-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  transform: scaleX(0);
  transform-origin: left;
  transition: var(--transition);
}
.feature-card:hover { border-color: var(--accent); transform: translateY(-3px); box-shadow: var(--shadow); }
.feature-card:hover::before { transform: scaleX(1); }

.feature-icon { font-size: 2rem; margin-bottom: 14px; }
.feature-card h3 {
  font-family: var(--font-head);
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
}
.feature-card p { color: var(--text-muted); font-size: 0.9rem; line-height: 1.7; margin-bottom: 16px; }
.feature-link {
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
  transition: var(--transition);
}
.feature-link:hover { color: #00ffb3; }

/* ── PATHS GRID ── */
.paths-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.path-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}
.path-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: rgba(255,255,255,0.15); }

.path-header {
  padding: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.path-logo {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 500;
  color: rgba(255,255,255,0.9);
  letter-spacing: 2px;
}

.path-body { padding: 20px; flex: 1; display: flex; flex-direction: column; }
.path-body h3 {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.path-body p { font-size: 0.82rem; color: var(--text-muted); margin-bottom: 14px; line-height: 1.6; }

.path-topics { margin-bottom: 16px; display: flex; flex-direction: column; gap: 4px; }
.path-topics li {
  font-size: 0.78rem;
  color: var(--text-dim);
  padding-left: 14px;
  position: relative;
}
.path-topics li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 0.7rem;
}

.path-badge {
  margin-top: auto;
  display: inline-block;
  background: rgba(0,229,160,0.08);
  border: 1px solid rgba(0,229,160,0.2);
  color: var(--accent);
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 600;
}

/* ── STEPS ── */
.steps-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
  align-items: start;
  gap: 12px;
}
.step-arrow {
  color: var(--accent);
  font-size: 1.5rem;
  margin-top: 16px;
  opacity: 0.5;
}
.step-num {
  font-family: var(--font-head);
  font-size: 3rem;
  font-weight: 800;
  color: var(--border);
  line-height: 1;
  margin-bottom: 10px;
}
.step h3 {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 8px;
}
.step p { font-size: 0.85rem; color: var(--text-muted); line-height: 1.7; }

/* ══════════════════════════════════════
   FOOTER
══════════════════════════════════════ */
.footer {
  background: var(--bg2);
  border-top: 1px solid var(--border);
  padding: 60px 0 30px;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-brand p {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-top: 10px;
  max-width: 280px;
}
.footer-links { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.footer-col { display: flex; flex-direction: column; gap: 10px; }
.footer-col h4 {
  font-family: var(--font-head);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 4px;
}
.footer-col a {
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: var(--transition);
}
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  text-align: center;
}
.footer-bottom p { font-size: 0.8rem; color: var(--text-dim); margin-bottom: 4px; }
.footer-bottom a { color: var(--accent); }
.footer-bottom strong { color: var(--text-muted); }

/* ══════════════════════════════════════
   LESSON PAGE
══════════════════════════════════════ */
.page-wrapper {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 100vh;
  padding-top: 64px;
}

/* Sidebar */
.sidebar {
  background: var(--bg2);
  border-right: 1px solid var(--border);
  padding: 24px 0;
  position: sticky;
  top: 64px;
  height: calc(100vh - 64px);
  overflow-y: auto;
}
.sidebar-header {
  padding: 0 20px 16px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 16px;
}
.sidebar-header h3 {
  font-family: var(--font-head);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-dim);
}

.lib-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 0 20px 16px;
}
.lib-btn {
  padding: 4px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font-mono);
}
.lib-btn.active, .lib-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(0,229,160,0.06);
}

.lesson-group { margin-bottom: 8px; }
.lesson-group-title {
  padding: 8px 20px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-dim);
}
.lesson-item {
  display: block;
  padding: 8px 20px;
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: var(--transition);
  cursor: pointer;
  border-left: 2px solid transparent;
}
.lesson-item:hover { color: var(--text); background: var(--surface); }
.lesson-item.active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: rgba(0,229,160,0.05);
  font-weight: 600;
}
.lesson-item .lesson-num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-dim);
  margin-right: 6px;
}

/* Main lesson content */
.lesson-main {
  padding: 40px 48px;
  max-width: 860px;
}

.lesson-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}
.badge {
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}
.badge-mpl   { background: rgba(46,134,193,0.15); color: #2e86c1; border: 1px solid rgba(46,134,193,0.3); }
.badge-sns   { background: rgba(30,132,73,0.15); color: #1e8449; border: 1px solid rgba(30,132,73,0.3); }
.badge-plotly{ background: rgba(155,89,182,0.15); color: #9b59b6; border: 1px solid rgba(155,89,182,0.3); }
.badge-pd    { background: rgba(211,84,0,0.15); color: #d35400; border: 1px solid rgba(211,84,0,0.3); }
.badge-beginner  { background: rgba(16,185,129,0.1); color: #10b981; border: 1px solid rgba(16,185,129,0.25); }
.badge-intermediate { background: rgba(245,158,11,0.1); color: #f59e0b; border: 1px solid rgba(245,158,11,0.25); }
.badge-advanced { background: rgba(239,68,68,0.1); color: #ef4444; border: 1px solid rgba(239,68,68,0.25); }

.lesson-title {
  font-family: var(--font-head);
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 12px;
  line-height: 1.2;
}

.lesson-intro {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 32px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border);
}

/* Lesson sections */
.lesson-section { margin-bottom: 40px; }
.lesson-section h2 {
  font-family: var(--font-head);
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.lesson-section h3 {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--accent2);
}
.lesson-section p {
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 12px;
  font-size: 0.93rem;
}

/* callout boxes */
.callout {
  border-radius: var(--radius);
  padding: 16px 20px;
  margin: 20px 0;
  border-left: 3px solid;
  font-size: 0.88rem;
  line-height: 1.7;
}
.callout-info  { background: rgba(0,180,216,0.08); border-color: var(--accent2); color: #a8d8ea; }
.callout-tip   { background: rgba(0,229,160,0.08); border-color: var(--accent); color: #a0f0d0; }
.callout-warn  { background: rgba(245,158,11,0.08); border-color: var(--warning); color: #fcd34d; }
.callout-label {
  font-weight: 700;
  font-size: 0.72rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 4px;
  display: block;
}

/* Code blocks */
.code-block {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin: 16px 0;
}
.code-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 14px;
  background: var(--bg3);
  border-bottom: 1px solid var(--border);
}
.code-block-title {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
}
.code-block-actions {
  display: flex;
  gap: 6px;
}
.copy-btn, .run-btn-inline {
  padding: 4px 10px;
  border-radius: 5px;
  border: none;
  font-size: 0.72rem;
  font-weight: 600;
  cursor: pointer;
  font-family: var(--font-mono);
  transition: var(--transition);
}
.copy-btn {
  background: var(--surface);
  color: var(--text-muted);
}
.copy-btn:hover { background: var(--bg3); color: var(--text); }
.run-btn-inline {
  background: rgba(0,229,160,0.12);
  color: var(--accent);
  border: 1px solid rgba(0,229,160,0.2);
}
.run-btn-inline:hover { background: rgba(0,229,160,0.2); }

.code-block pre {
  padding: 18px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.75;
  overflow-x: auto;
  color: #c9d1d9;
}

/* Annotated code */
.annotated-line {
  display: flex;
  gap: 0;
  position: relative;
}
.annotated-line:hover .line-annotation { display: block; }
.line-annotation {
  display: none;
  position: absolute;
  left: 100%;
  top: 0;
  margin-left: 12px;
  background: var(--surface);
  border: 1px solid var(--accent);
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 0.75rem;
  color: var(--text-muted);
  width: 240px;
  z-index: 10;
  line-height: 1.5;
  box-shadow: var(--shadow);
}

/* Param table */
.param-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
  margin: 12px 0;
}
.param-table th, .param-table td {
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.param-table th {
  font-family: var(--font-head);
  font-size: 0.72rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-dim);
  background: var(--bg3);
}
.param-table td { color: var(--text-muted); }
.param-table td:first-child {
  font-family: var(--font-mono);
  color: var(--accent2);
  font-size: 0.78rem;
}
.param-table tr:hover td { background: var(--bg3); }

/* ══════════════════════════════════════
   PLAYGROUND
══════════════════════════════════════ */
.playground-wrapper {
  padding-top: 64px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
.playground-header {
  padding: 20px 24px;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.playground-header h1 {
  font-family: var(--font-head);
  font-size: 1.1rem;
  font-weight: 700;
}

.playground-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  flex: 1;
  min-height: calc(100vh - 130px);
}
.editor-panel, .output-panel {
  display: flex;
  flex-direction: column;
}
.panel-header {
  padding: 10px 16px;
  background: var(--bg3);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  gap: 8px;
}
.panel-title { font-weight: 600; color: var(--text); }

.output-panel { border-left: 1px solid var(--border); }

#editor {
  flex: 1;
  background: var(--bg);
  color: #c9d1d9;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.75;
  padding: 16px;
  border: none;
  outline: none;
  resize: none;
  min-height: 400px;
}
#editor:focus { background: var(--bg); }

#output-area {
  flex: 1;
  padding: 16px;
  overflow-y: auto;
  min-height: 400px;
  background: var(--bg);
}

.output-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-dim);
  gap: 12px;
  font-size: 0.9rem;
  text-align: center;
}
.output-placeholder-icon { font-size: 3rem; opacity: 0.3; }

.pyodide-status {
  padding: 8px 16px;
  background: var(--bg3);
  border-top: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 8px;
}
.status-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--warning);
  animation: pulse 1.5s infinite;
}
.status-dot.ready { background: var(--success); animation: none; }
.status-dot.error { background: var(--danger); animation: none; }
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.output-text {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: pre-wrap;
  margin-bottom: 12px;
}
.output-error {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--danger);
  white-space: pre-wrap;
  background: rgba(239,68,68,0.06);
  border: 1px solid rgba(239,68,68,0.2);
  border-radius: var(--radius);
  padding: 12px;
}
.output-image {
  max-width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

/* snippet selector */
.snippet-selector {
  padding: 12px 16px;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.snippet-selector label {
  font-size: 0.8rem;
  color: var(--text-muted);
  flex-shrink: 0;
}
.snippet-selector select {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 6px 10px;
  border-radius: 8px;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  cursor: pointer;
}
.snippet-selector select:focus { outline: none; border-color: var(--accent); }

/* ══════════════════════════════════════
   CHEAT SHEET
══════════════════════════════════════ */
.cheatsheet-header {
  padding: 60px 0 40px;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
}
.cheatsheet-header h1 {
  font-family: var(--font-head);
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 8px;
}
.cheatsheet-header p { color: var(--text-muted); font-size: 0.95rem; }

.cheatsheet-search-bar {
  margin: 24px 0 32px;
}
.search-input-wrap {
  position: relative;
  max-width: 480px;
}
.search-input-wrap input {
  width: 100%;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 40px 12px 16px;
  color: var(--text);
  font-size: 0.9rem;
  font-family: var(--font-body);
  transition: var(--transition);
}
.search-input-wrap input:focus { outline: none; border-color: var(--accent); }
.search-icon {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-dim);
}

.cheatsheet-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  padding: 40px 0 80px;
}
.cheat-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
}
.cheat-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.cheat-card-header {
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
}
.cheat-card-title {
  font-family: var(--font-head);
  font-size: 0.9rem;
  font-weight: 700;
}
.cheat-card-body { padding: 16px 18px; }
.cheat-card pre {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: #c9d1d9;
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-word;
}

/* ══════════════════════════════════════
   QUIZ
══════════════════════════════════════ */
.quiz-wrapper {
  padding-top: 64px;
  min-height: 100vh;
}
.quiz-hero {
  padding: 60px 0 48px;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
}
.quiz-hero h1 {
  font-family: var(--font-head);
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 8px;
}

.quiz-filters {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 24px 0;
}
.filter-btn {
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.filter-btn.active, .filter-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(0,229,160,0.06);
}

.quiz-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  padding: 40px 0 80px;
}
.quiz-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.quiz-card-header {
  padding: 18px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
}
.quiz-card-title {
  font-family: var(--font-head);
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1.4;
}
.quiz-card-body {
  padding: 16px 20px;
  flex: 1;
}
.quiz-card-body pre {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: #c9d1d9;
  line-height: 1.7;
  background: var(--bg);
  border-radius: 8px;
  padding: 12px;
  margin-bottom: 14px;
  overflow-x: auto;
  white-space: pre-wrap;
}
.quiz-options { display: flex; flex-direction: column; gap: 8px; }
.quiz-opt {
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: var(--transition);
  background: transparent;
  text-align: left;
  font-family: var(--font-body);
}
.quiz-opt:hover { border-color: var(--accent2); color: var(--text); background: var(--surface); }
.quiz-opt.correct { border-color: var(--success); background: rgba(16,185,129,0.08); color: var(--success); }
.quiz-opt.wrong { border-color: var(--danger); background: rgba(239,68,68,0.08); color: var(--danger); }
.quiz-opt.disabled { cursor: default; }

.quiz-feedback {
  margin-top: 12px;
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 0.83rem;
  display: none;
}
.quiz-feedback.show { display: block; }
.quiz-feedback.correct { background: rgba(16,185,129,0.08); color: var(--success); }
.quiz-feedback.wrong { background: rgba(239,68,68,0.08); color: var(--danger); }

/* ══════════════════════════════════════
   GALLERY
══════════════════════════════════════ */
.gallery-wrapper { padding-top: 64px; }
.gallery-hero {
  padding: 60px 0 40px;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
}
.gallery-hero h1 {
  font-family: var(--font-head);
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 8px;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  padding: 40px 0 80px;
}
.gallery-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
}
.gallery-card:hover { border-color: var(--accent); transform: translateY(-3px); box-shadow: var(--shadow); }
.gallery-preview {
  height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  font-size: 3rem;
  color: var(--text-dim);
}
.gallery-card-body { padding: 16px; }
.gallery-card-body h3 {
  font-family: var(--font-head);
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 6px;
}
.gallery-card-body p {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  line-height: 1.5;
}
.gallery-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ══════════════════════════════════════
   ABOUT
══════════════════════════════════════ */
.about-hero {
  padding: 100px 0 60px;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
}
.about-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.about-name {
  font-family: var(--font-head);
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -1.5px;
  margin-bottom: 8px;
}
.about-title {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  margin-bottom: 20px;
}
.about-bio { color: var(--text-muted); font-size: 0.93rem; line-height: 1.85; margin-bottom: 24px; }
.social-links { display: flex; flex-wrap: wrap; gap: 10px; }
.social-link {
  padding: 7px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.8rem;
  color: var(--text-muted);
  transition: var(--transition);
  font-family: var(--font-mono);
}
.social-link:hover { border-color: var(--accent); color: var(--accent); background: rgba(0,229,160,0.06); }

.about-stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.about-stat-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
}
.about-stat-num {
  font-family: var(--font-head);
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
}
.about-stat-label { font-size: 0.78rem; color: var(--text-dim); margin-top: 4px; }

/* ══════════════════════════════════════
   PROGRESS TRACKER
══════════════════════════════════════ */
.progress-bar-wrap {
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  margin: 16px 0;
}
.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius: 2px;
  transition: width 0.5s ease;
}

/* ══════════════════════════════════════
   UTILS & RESPONSIVE
══════════════════════════════════════ */
.text-accent { color: var(--accent); }
.text-muted  { color: var(--text-muted); }
.text-mono   { font-family: var(--font-mono); }
.mt-8  { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mb-8  { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.d-flex { display: flex; }
.align-center { align-items: center; }
.gap-8  { gap: 8px; }
.gap-12 { gap: 12px; }

@media (max-width: 1100px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-card--large { grid-column: span 1; }
  .paths-grid { grid-template-columns: repeat(2, 1fr); }
  .page-wrapper { grid-template-columns: 240px 1fr; }
}

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; padding: 90px 24px 48px; }
  .hero-visual { display: none; }
  .playground-body { grid-template-columns: 1fr; }
  .output-panel { border-left: none; border-top: 1px solid var(--border); }
  .steps-grid { grid-template-columns: 1fr; }
  .step-arrow { display: none; }
  .cheatsheet-grid { grid-template-columns: repeat(2, 1fr); }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
  .quiz-grid { grid-template-columns: 1fr; }
  .about-inner { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
}

@media (max-width: 700px) {
  .nav-links { display: none; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: var(--bg2); border-bottom: 1px solid var(--border); padding: 16px 0; gap: 0; }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 24px; }
  .hamburger { display: flex; }
  .page-wrapper { grid-template-columns: 1fr; }
  .sidebar { position: static; height: auto; }
  .features-grid { grid-template-columns: 1fr; }
  .paths-grid { grid-template-columns: 1fr; }
  .cheatsheet-grid { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: 1fr; }
}

/* ══════════════════════════════════════
   NEW PAGES — ENHANCED STYLES (v2)
══════════════════════════════════════ */

/* ── Shared page hero ── */
.page-hero {
  padding: 56px 0 36px;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
}
.page-hero h1 {
  font-family: var(--font-head);
  font-size: 2.2rem; font-weight: 800;
  letter-spacing: -1px; margin-bottom: 8px;
}

/* ── Run spinner (used in playground & params) ── */
.run-spinner {
  display: inline-block;
  width: 13px; height: 13px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  vertical-align: middle;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Toast notification ── */
.toast {
  position: fixed;
  bottom: 24px; right: 24px;
  background: var(--surface);
  border: 1px solid var(--accent);
  color: var(--text);
  padding: 10px 18px;
  border-radius: var(--radius);
  font-size: 0.84rem;
  font-weight: 600;
  z-index: 9999;
  box-shadow: var(--shadow-lg);
  animation: slideUp 0.25s ease;
  pointer-events: none;
}
@keyframes slideUp {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Back-to-top button ── */
.back-to-top {
  position: fixed;
  bottom: 24px; right: 24px;
  width: 40px; height: 40px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 50%;
  display: none;
  align-items: center; justify-content: center;
  cursor: pointer;
  font-size: 1rem;
  color: var(--text-muted);
  transition: var(--transition);
  z-index: 80;
  box-shadow: var(--shadow);
}
.back-to-top.visible { display: flex; }
.back-to-top:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }

/* ── Keyboard shortcut badge ── */
.kbd {
  display: inline-block;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 6px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  margin: 0 2px;
}

/* ── Lesson reading progress bar (top of page) ── */
.reading-progress {
  position: fixed;
  top: 64px; left: 0; right: 0;
  height: 3px;
  background: transparent;
  z-index: 99;
}
.reading-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  width: 0%;
  transition: width 0.1s linear;
}

/* ── Enhanced lesson sidebar search ── */
.sidebar-search {
  padding: 0 14px 12px;
}
.sidebar-search input {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 7px 12px;
  color: var(--text);
  font-size: 0.8rem;
  font-family: var(--font-body);
  transition: var(--transition);
}
.sidebar-search input:focus {
  outline: none;
  border-color: var(--accent);
}

/* ── Lesson difficulty indicator dots ── */
.difficulty-dots {
  display: inline-flex;
  gap: 3px;
  align-items: center;
}
.difficulty-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--border);
}
.difficulty-dot.filled { background: var(--accent); }

/* ── Callout enhancements ── */
.callout strong { color: inherit; font-weight: 700; }

/* ── Table of contents (lesson page) ── */
.lesson-toc {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 18px;
  margin-bottom: 28px;
  font-size: 0.82rem;
}
.lesson-toc-title {
  font-family: var(--font-head);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 8px;
}
.lesson-toc a {
  display: block;
  color: var(--text-muted);
  padding: 3px 0;
  transition: var(--transition);
}
.lesson-toc a:hover { color: var(--accent); }

/* ── Quiz score ring ── */
.score-ring {
  width: 80px; height: 80px;
  border-radius: 50%;
  background: conic-gradient(
    var(--accent) var(--pct, 0%),
    var(--border) var(--pct, 0%)
  );
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-head);
  font-size: 1.1rem; font-weight: 800;
  color: var(--accent);
  position: relative;
  flex-shrink: 0;
}
.score-ring::before {
  content: '';
  position: absolute;
  inset: 8px;
  background: var(--bg2);
  border-radius: 50%;
}
.score-ring span { position: relative; z-index: 1; }

/* ── Gallery live preview canvas ── */
.gallery-canvas-preview {
  height: 180px;
  display: flex; align-items: center; justify-content: center;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}
.gallery-canvas-preview img {
  max-height: 100%; max-width: 100%;
  object-fit: contain;
}

/* ── Feature tooltip on hover ── */
[data-tip] { position: relative; cursor: help; }
[data-tip]::after {
  content: attr(data-tip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.74rem;
  line-height: 1.5;
  padding: 6px 10px;
  border-radius: 7px;
  white-space: nowrap;
  max-width: 220px;
  white-space: normal;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s;
  z-index: 200;
  box-shadow: var(--shadow);
}
[data-tip]:hover::after { opacity: 1; }

/* ── Playground line numbers ── */
.editor-line-numbers {
  width: 36px;
  background: var(--bg3);
  border-right: 1px solid var(--border);
  padding: 16px 6px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.75;
  color: var(--text-dim);
  text-align: right;
  user-select: none;
  overflow: hidden;
  flex-shrink: 0;
}

/* ── Responsive fixes for new pages ── */
@media (max-width: 900px) {
  .pe-body { grid-template-columns: 1fr; }
  .compare-grid { grid-template-columns: repeat(2,1fr); }
}
@media (max-width: 600px) {
  .compare-grid { grid-template-columns: 1fr; }
  .pe-body { grid-template-columns: 1fr; }
  .about-stats-grid { grid-template-columns: repeat(2,1fr); }
}

/* ── Print styles ── */
@media print {
  .navbar, .hamburger, .btn, footer { display: none !important; }
  body { background: white; color: black; }
  .code-block pre, .term-example, .code-bad, .code-good {
    background: #f5f5f5;
    border: 1px solid #ccc;
    color: #333;
  }
}

/* ══════════════════════════════════════
   v3 ADDITIONS
══════════════════════════════════════ */

/* ── Progress Dashboard ── */
.stat-strip { display:grid; grid-template-columns:repeat(5,1fr); gap:16px; margin:32px 0; }
@media(max-width:900px){.stat-strip{grid-template-columns:repeat(3,1fr);}}
@media(max-width:560px){.stat-strip{grid-template-columns:repeat(2,1fr);}}
.stat-card { background:var(--bg2); border:1px solid var(--border); border-radius:var(--radius-lg); padding:20px 16px; text-align:center; transition:var(--transition); }
.stat-card:hover { border-color:var(--accent); transform:translateY(-2px); }
.stat-card-num { font-family:var(--font-head); font-size:2.2rem; font-weight:800; color:var(--accent); line-height:1; }
.stat-card-label { font-size:0.72rem; color:var(--text-dim); letter-spacing:1px; text-transform:uppercase; margin-top:5px; }
.stat-card-sub { font-size:0.72rem; color:var(--text-muted); margin-top:3px; }

.rings-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:16px; }
@media(max-width:700px){.rings-grid{grid-template-columns:repeat(2,1fr);}}
.ring-card { background:var(--bg2); border:1px solid var(--border); border-radius:var(--radius-lg); padding:24px 16px; display:flex; flex-direction:column; align-items:center; gap:10px; }
.ring-card h3 { font-family:var(--font-head); font-size:0.85rem; font-weight:700; text-align:center; }
.ring-canvas-wrap { position:relative; width:90px; height:90px; }
.ring-svg { width:90px; height:90px; transform:rotate(-90deg); }
.ring-bg { fill:none; stroke:var(--border); stroke-width:8; }
.ring-fill { fill:none; stroke-width:8; stroke-linecap:round; transition:stroke-dashoffset 1s ease; }
.ring-label { position:absolute; inset:0; display:flex; flex-direction:column; align-items:center; justify-content:center; font-family:var(--font-head); }
.ring-pct { font-size:1.1rem; font-weight:800; line-height:1; }
.ring-done { font-size:0.65rem; color:var(--text-dim); }

.dash-section { background:var(--bg2); border:1px solid var(--border); border-radius:var(--radius-lg); overflow:hidden; margin-bottom:20px; }
.dash-section-header { padding:14px 20px; border-bottom:1px solid var(--border); display:flex; align-items:center; justify-content:space-between; }
.dash-section-title { font-family:var(--font-head); font-size:0.95rem; font-weight:700; }
.dash-section-body { padding:20px; }

.activity-item { display:flex; align-items:center; gap:14px; padding:10px 16px; border-bottom:1px solid var(--border); font-size:0.83rem; transition:var(--transition); }
.activity-item:last-child { border-bottom:none; }
.activity-item:hover { background:var(--bg3); }
.activity-icon { font-size:1.1rem; flex-shrink:0; width:28px; text-align:center; }
.activity-text { flex:1; color:var(--text-muted); }
.activity-text strong { color:var(--text); }
.activity-time { font-family:var(--font-mono); font-size:0.7rem; color:var(--text-dim); flex-shrink:0; }

.streak-grid { display:grid; grid-template-columns:repeat(7,1fr); gap:4px; }
.streak-day { height:28px; border-radius:4px; background:var(--border); display:flex; align-items:center; justify-content:center; font-size:0.6rem; color:var(--text-dim); transition:var(--transition); cursor:default; }
.streak-day.active { background:rgba(0,229,160,0.18); border:1px solid rgba(0,229,160,0.3); color:var(--accent); }
.streak-day.today { background:var(--accent); color:var(--bg); font-weight:700; }
.streak-labels { display:grid; grid-template-columns:repeat(7,1fr); gap:4px; margin-bottom:4px; }
.streak-label { text-align:center; font-size:0.62rem; color:var(--text-dim); font-family:var(--font-mono); }

.quiz-hist-row { display:grid; grid-template-columns:1fr auto auto; gap:12px; align-items:center; padding:8px 0; border-bottom:1px solid var(--border); font-size:0.82rem; }
.quiz-hist-row:last-child { border-bottom:none; }
.quiz-hist-label { color:var(--text-muted); }
.quiz-hist-score { font-family:var(--font-mono); font-weight:700; }
.quiz-hist-bar-wrap { width:80px; height:4px; background:var(--border); border-radius:2px; }
.quiz-hist-bar { height:100%; border-radius:2px; background:var(--accent); }

.badges-grid { display:flex; flex-wrap:wrap; gap:10px; }
.badge-item { display:flex; flex-direction:column; align-items:center; gap:5px; padding:14px 10px; background:var(--bg3); border:1px solid var(--border); border-radius:var(--radius); min-width:76px; text-align:center; transition:var(--transition); }
.badge-item.earned { border-color:var(--accent); background:rgba(0,229,160,0.05); }
.badge-item.locked { opacity:0.35; filter:grayscale(1); }
.badge-emoji { font-size:1.7rem; }
.badge-name { font-size:0.65rem; font-weight:700; color:var(--text-muted); }

.next-card { display:flex; align-items:center; gap:14px; padding:12px 16px; border-bottom:1px solid var(--border); cursor:pointer; transition:var(--transition); }
.next-card:last-child { border-bottom:none; }
.next-card:hover { background:var(--bg3); }
.next-icon { font-size:1.2rem; flex-shrink:0; }
.next-body { flex:1; }
.next-title { font-size:0.85rem; font-weight:600; color:var(--text); margin-bottom:2px; }
.next-sub { font-size:0.72rem; color:var(--text-muted); }
.next-arrow { color:var(--accent); font-size:0.9rem; flex-shrink:0; }

.danger-zone { border:1px solid rgba(239,68,68,0.25); border-radius:var(--radius-lg); padding:20px; margin-top:20px; background:rgba(239,68,68,0.03); }
.danger-zone h3 { font-family:var(--font-head); font-size:0.88rem; font-weight:700; color:var(--danger); margin-bottom:6px; }
.danger-zone p { font-size:0.78rem; color:var(--text-muted); margin-bottom:10px; }

/* ── Quick Reference ── */
.tab-strip { display:flex; gap:0; border-bottom:1px solid var(--border); background:var(--bg2); flex-wrap:wrap; }
.ts-btn { padding:9px 16px; border:none; border-bottom:2px solid transparent; background:transparent; color:var(--text-muted); font-size:0.82rem; font-weight:600; cursor:pointer; transition:var(--transition); font-family:var(--font-body); }
.ts-btn.active { color:var(--accent); border-bottom-color:var(--accent); background:rgba(0,229,160,0.04); }
.ts-btn:hover { color:var(--text); }

.qr-grid { columns:2; column-gap:14px; padding:0 0 80px; }
@media(max-width:780px){.qr-grid{columns:1;}}
.qr-card { break-inside:avoid; background:var(--bg2); border:1px solid var(--border); border-radius:var(--radius); margin-bottom:12px; overflow:hidden; transition:var(--transition); }
.qr-card:hover { border-color:var(--accent); }
.qr-card-head { padding:8px 14px; background:var(--bg3); border-bottom:1px solid var(--border); display:flex; align-items:center; justify-content:space-between; gap:8px; cursor:pointer; }
.qr-card-head:hover { background:var(--surface); }
.qr-card-title { font-family:var(--font-head); font-size:0.8rem; font-weight:700; }
.qr-card-lib { font-family:var(--font-mono); font-size:0.65rem; font-weight:700; padding:2px 7px; border-radius:4px; }
.qr-card pre { padding:10px 14px; font-family:var(--font-mono); font-size:0.72rem; line-height:1.65; color:#c9d1d9; overflow-x:auto; white-space:pre; margin:0; background:#0d1117; }
.qr-card-foot { padding:6px 14px; background:var(--bg3); border-top:1px solid var(--border); display:flex; gap:6px; }

/* ── Responsive additions ── */
@media(max-width:700px) {
  .stat-strip { grid-template-columns:repeat(2,1fr); }
  .rings-grid { grid-template-columns:repeat(2,1fr); }
  .badges-grid { justify-content:center; }
}

/* ── Print for quickref ── */
@media print {
  .navbar,.hamburger,.back-to-top,.btn,
  .qr-card-foot,.tab-strip,.qr-hero { display:none !important; }
  body { background:white; color:black; }
  .qr-grid { columns:3; padding:0; }
  .qr-card { border:1px solid #ccc; background:white; margin-bottom:6px; }
  .qr-card-head { background:#f5f5f5; }
  .qr-card-title { color:black; font-size:0.75rem; }
  .qr-card pre { background:#fafafa; color:#333; font-size:0.65rem; display:block !important; }
  .container { max-width:100%; padding:0 8px; }
}

/* ══════════════════════════════════════
   v4 FREE ENHANCEMENTS — Roadmap, Dataset Lab, Story Builder, Project Studio
══════════════════════════════════════ */
.vl-note{background:rgba(0,229,160,.06);border:1px solid rgba(0,229,160,.18);border-left:4px solid var(--accent);border-radius:var(--radius);padding:14px 18px;color:var(--text-muted);font-size:.9rem;line-height:1.7}.vl-note code{font-family:var(--font-mono);color:var(--accent2)}
.vl-progress-mini{height:8px;background:var(--border);border-radius:999px;overflow:hidden;max-width:520px;margin:22px 0 8px}.vl-progress-mini span{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--accent),var(--accent2));transition:width .5s ease}
.vl-panel{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius-lg);padding:22px;box-shadow:var(--shadow)}.vl-panel-head{display:flex;justify-content:space-between;gap:16px;align-items:flex-start;margin-bottom:14px}.vl-panel h2{font-family:var(--font-head);font-size:1.18rem;font-weight:800;letter-spacing:-.3px}.vl-panel h3,.vl-card h3,.vl-dataset-card h3,.vl-project-card h3{font-family:var(--font-head);font-size:.9rem;font-weight:700;margin:16px 0 8px;color:var(--accent2)}
.vl-cards-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.vl-card{background:var(--bg3);border:1px solid var(--border);border-radius:var(--radius);padding:18px}.vl-card p{font-size:.86rem;color:var(--text-muted)}
.vl-timeline{display:flex;flex-direction:column;gap:20px;margin-top:28px}.vl-timeline-item{display:grid;grid-template-columns:54px 1fr;gap:14px}.vl-timeline-dot{width:42px;height:42px;border-radius:50%;display:flex;align-items:center;justify-content:center;background:var(--surface);border:1px solid var(--accent);color:var(--accent);font-family:var(--font-head);font-weight:800;position:sticky;top:86px}.vl-task-list{display:flex;flex-direction:column;gap:10px;margin-top:16px}.vl-task{display:grid;grid-template-columns:auto 1fr auto;gap:12px;align-items:center;background:var(--bg);border:1px solid var(--border);border-radius:10px;padding:11px 14px;color:var(--text-muted);font-size:.88rem}.vl-task.done{border-color:rgba(0,229,160,.35);background:rgba(0,229,160,.04)}.vl-task input{accent-color:var(--accent)}.vl-task a{color:var(--accent);font-weight:700;font-size:.8rem}
.vl-toolbar{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:22px}.vl-input{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:11px 13px;color:var(--text);font-family:var(--font-body);font-size:.9rem;width:100%;transition:var(--transition)}.vl-toolbar .vl-input{width:auto;min-width:210px}.vl-input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(0,229,160,.08)}.vl-label{display:block;font-size:.76rem;text-transform:uppercase;letter-spacing:1px;color:var(--text-dim);font-weight:700;margin:14px 0 6px}
.vl-dataset-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}.vl-dataset-card,.vl-project-card{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius-lg);padding:22px;transition:var(--transition);position:relative;overflow:hidden}.vl-dataset-card:hover,.vl-project-card:hover{border-color:var(--accent);transform:translateY(-2px)}.vl-dataset-card h2,.vl-project-card h2{font-family:var(--font-head);font-size:1.15rem;font-weight:800;margin:12px 0 8px}.vl-dataset-card ol,.vl-dataset-card ul,.vl-project-card ol,.vl-project-card ul{padding-left:20px;color:var(--text-muted);font-size:.88rem}.vl-card-top{display:flex;justify-content:space-between;align-items:center;gap:10px}.vl-chip-row{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0}.vl-chip{display:inline-flex;align-items:center;border:1px solid var(--border);background:var(--bg3);color:var(--text-muted);font-size:.74rem;border-radius:999px;padding:4px 9px}.vl-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
.vl-split{display:grid;grid-template-columns:420px 1fr;gap:22px}.vl-advice{min-height:240px}.vl-result-card{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:18px}.vl-result-card h3{font-size:1.25rem;color:var(--accent);margin-top:0}.vl-result-card ol{padding-left:20px;color:var(--text-muted);font-size:.88rem}.vl-form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:14px}.vl-form-grid label{font-size:.8rem;color:var(--text-muted);font-weight:700}.vl-form-grid textarea{resize:vertical}.vl-pre{background:#0d1117;border:1px solid var(--border);border-radius:var(--radius);padding:16px;color:#c9d1d9;font-family:var(--font-mono);font-size:.8rem;white-space:pre-wrap;overflow:auto}
.vl-project-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}.vl-project-card.done{border-color:rgba(0,229,160,.45);background:linear-gradient(180deg,rgba(0,229,160,.05),var(--bg2))}.vl-step-num{font-family:var(--font-head);font-size:2rem;font-weight:800;color:var(--border);line-height:1}.vl-project-card.done .vl-step-num{color:var(--accent)}
@media(max-width:950px){.vl-split{grid-template-columns:1fr}.vl-dataset-grid,.vl-project-grid,.vl-cards-3{grid-template-columns:1fr}.vl-form-grid{grid-template-columns:1fr}.vl-toolbar .vl-input{width:100%}.vl-timeline-item{grid-template-columns:1fr}.vl-timeline-dot{position:static}}

/* Keep large navigation usable as feature count grows */
@media (min-width:701px){
  .nav-links{flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none;max-width:calc(100vw - 230px);padding-bottom:2px;}
  .nav-links::-webkit-scrollbar{display:none;}
  .nav-links a{white-space:nowrap;padding:5px 9px;font-size:.8rem;}
}

/* ══════════════════════════════════════
   v5 FINAL EXPERT LAYER — Learning Tools + Accessibility
══════════════════════════════════════ */
.vl-search-results{display:grid;gap:10px}.vl-search-item{display:grid;grid-template-columns:180px 1fr auto;gap:14px;align-items:center;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:14px;transition:var(--transition)}.vl-search-item:hover{border-color:var(--accent);transform:translateY(-1px)}.vl-search-item strong{color:var(--accent);font-family:var(--font-head)}.vl-search-item span{color:var(--text-muted);font-size:.88rem}.vl-search-item em{color:var(--accent2);font-style:normal;font-size:.8rem;font-weight:700}.vl-note-card{display:grid;grid-template-columns:1fr auto;gap:16px;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:14px;margin-bottom:10px}.vl-note-card p{color:var(--text-muted);font-size:.88rem;margin:6px 0;white-space:pre-wrap}.vl-note-card small{color:var(--text-dim);font-family:var(--font-mono)}.vl-flashcard{background:linear-gradient(135deg,var(--bg),var(--bg3));border:1px solid var(--border);border-radius:var(--radius-lg);padding:28px;min-height:270px;display:flex;flex-direction:column;justify-content:center}.vl-flashcard h2{font-family:var(--font-head);font-size:1.45rem;line-height:1.3;margin:18px 0;color:var(--text)}.vl-flash-answer{font-size:1.05rem;color:var(--accent);background:rgba(0,229,160,.06);border:1px solid rgba(0,229,160,.18);border-radius:var(--radius);padding:16px}.vl-certificate{background:#f8fafc;color:#0f172a;border:8px solid #00e5a0;padding:18px;border-radius:8px}.cert-inner{border:2px solid #0f172a;padding:42px 28px;text-align:center;background:radial-gradient(circle at top,#fff,#eef2f7)}.cert-brand{font-family:var(--font-head);font-weight:800;color:#047857;font-size:1.2rem;letter-spacing:2px;text-transform:uppercase}.cert-inner h2{font-family:serif;font-size:2.2rem;margin:12px 0;color:#0f172a}.cert-inner h1{font-family:var(--font-head);font-size:2.6rem;color:#047857;border-bottom:2px solid #cbd5e1;display:inline-block;padding:6px 30px;margin:8px 0}.cert-inner h3{font-size:1.25rem;color:#0f172a}.cert-row{display:flex;justify-content:space-between;gap:14px;margin:26px 0;color:#334155;font-weight:700}.cert-sign{margin-top:30px;font-weight:800;color:#0f172a}.cert-sign small{font-weight:400;color:#64748b}.cert-small{font-size:.72rem;color:#64748b;margin-top:22px}
.vl-a11y-toggle{position:fixed;left:18px;bottom:18px;z-index:9998;width:42px;height:42px;border-radius:50%;border:1px solid var(--accent);background:var(--surface);color:var(--accent);font-weight:800;box-shadow:var(--shadow);cursor:pointer}.vl-a11y-panel{position:fixed;left:18px;bottom:68px;z-index:9998;width:280px;background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius-lg);padding:16px;box-shadow:var(--shadow-lg);display:none}.vl-a11y-panel.open{display:block}.vl-a11y-panel h3{font-family:var(--font-head);font-size:1rem;margin-bottom:10px}.vl-a11y-panel label{display:flex;align-items:center;justify-content:space-between;gap:10px;color:var(--text-muted);font-size:.84rem;margin:10px 0}.vl-a11y-panel input[type=range]{width:120px}.a11y-large{font-size:18px}.a11y-xlarge{font-size:20px}.a11y-contrast{--bg:#05070c;--bg2:#000;--bg3:#111;--surface:#111827;--border:#64748b;--text:#fff;--text-muted:#e5e7eb;--text-dim:#cbd5e1;--accent:#7cffcb;--accent2:#7dd3fc}.a11y-reduce-motion *, .a11y-reduce-motion *::before, .a11y-reduce-motion *::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
@media(max-width:700px){.vl-search-item{grid-template-columns:1fr}.cert-row{flex-direction:column}.cert-inner h1{font-size:1.8rem}.vl-a11y-panel{left:12px;right:12px;width:auto}}
@media print{.navbar,.footer,.tab-strip,.vl-actions,.vl-a11y-toggle,.vl-a11y-panel{display:none!important}.vl-certificate{border:8px solid #00a36c;box-shadow:none}.tool-section{display:block!important}.tool-section:not(#tool-certificate){display:none!important}}

/* ══════════════════════════════════════
   v6 ENTERPRISE FEATURES — Static Admin Console
══════════════════════════════════════ */
.ent-brand-card{border:1px solid var(--border);border-radius:var(--radius-lg);padding:24px;background:linear-gradient(135deg,rgba(0,229,160,.08),var(--bg3));}.ent-brand-card h2{font-family:var(--font-head);font-size:1.6rem;color:var(--accent);margin-bottom:6px}.ent-brand-card p{color:var(--text);font-weight:700}.ent-brand-card small{color:var(--text-muted)}
.ent-cohort-card,.ent-issue{display:grid;grid-template-columns:1fr auto;gap:16px;align-items:start;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:16px;margin-bottom:12px}.ent-cohort-card h3,.ent-issue h3{font-family:var(--font-head);font-size:1rem;color:var(--accent2);margin:0 0 6px}.ent-cohort-card p,.ent-issue p{font-size:.86rem;color:var(--text-muted);margin:4px 0}.ent-issue.high{border-left:4px solid var(--danger)}.ent-issue.critical{border-left:4px solid #dc2626;background:rgba(239,68,68,.04)}.ent-issue.medium{border-left:4px solid var(--warning)}.ent-issue.low{border-left:4px solid var(--accent2)}
.ent-section .param-table td,.ent-section .param-table th{white-space:nowrap}.ent-section hr{border-color:var(--border)}
@media(max-width:700px){.ent-cohort-card,.ent-issue{grid-template-columns:1fr}.ent-section .stat-strip{grid-template-columns:repeat(2,1fr)}}

/* ══════════════════════════════════════
   v7 CURRICULUM + TRAINING PACK — Beginner to Expert Pathway
══════════════════════════════════════ */
.curriculum-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}.curr-card{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius-lg);padding:22px;transition:var(--transition)}.curr-card:hover{border-color:var(--accent);transform:translateY(-2px)}.curr-card.done{background:linear-gradient(180deg,rgba(0,229,160,.05),var(--bg2));border-color:rgba(0,229,160,.45)}.curr-card h2{font-family:var(--font-head);font-size:1.14rem;line-height:1.3;margin:14px 0;color:var(--text)}.curr-card h3{font-family:var(--font-head);font-size:.86rem;color:var(--accent2);margin:14px 0 7px}.curr-card ul,.curr-card ol{padding-left:20px;color:var(--text-muted);font-size:.86rem}.curr-card li{margin-bottom:4px}@media(max-width:900px){.curriculum-grid{grid-template-columns:1fr}}