/* Mind Boot Academy — CodeDex-inspired learning UI */
@import url("https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;600&family=Press+Start+2P&family=Inter:wght@400;500;600;700&display=swap");

:root {
  --learn-bg: #0a0e1a;
  --learn-surface: #12182b;
  --learn-surface-2: #1a2240;
  --learn-border: rgba(94, 184, 255, 0.2);
  --learn-text: #e8edf7;
  --learn-muted: #8b9bb8;
  --learn-accent: #42d392;
  --learn-accent-2: #5eb8ff;
  --learn-purple: #c084fc;
  --learn-gold: #fbbf24;
  --learn-danger: #f87171;
  --learn-mono: "JetBrains Mono", monospace;
  --learn-pixel: "Press Start 2P", monospace;
  --learn-font: "Inter", system-ui, sans-serif;
  --learn-radius: 12px;
  --learn-nav-h: 64px;
}

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

html { scroll-behavior: smooth; }

body.learn-body {
  margin: 0;
  min-height: 100vh;
  background: var(--learn-bg);
  color: var(--learn-text);
  font-family: var(--learn-font);
  line-height: 1.6;
}

body.learn-body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 20% -10%, rgba(66, 211, 146, 0.12), transparent),
    radial-gradient(ellipse 60% 40% at 80% 100%, rgba(124, 156, 255, 0.1), transparent);
  pointer-events: none;
  z-index: 0;
}

.learn-wrap { position: relative; z-index: 1; }

/* ── Nav ── */
.learn-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--learn-nav-h);
  background: rgba(10, 14, 26, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--learn-border);
  display: flex;
  align-items: center;
  padding: 0 clamp(16px, 4vw, 32px);
  gap: 16px;
}

.learn-nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--learn-text);
  font-weight: 700;
  font-size: 0.95rem;
  flex-shrink: 0;
}

.learn-nav-logo img { width: 32px; height: 32px; }

.learn-nav-logo span.accent { color: var(--learn-accent); }

.learn-nav-spacer { flex: 1; }

.learn-stats {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.85rem;
}

.learn-stat {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--learn-surface);
  border: 1px solid var(--learn-border);
  border-radius: 999px;
  padding: 4px 12px;
}

.learn-stat-xp { color: var(--learn-gold); font-weight: 600; }

.learn-stat-streak { color: #fb923c; }

.learn-level-badge {
  background: linear-gradient(135deg, var(--learn-accent), var(--learn-accent-2));
  color: #0a0e1a;
  font-weight: 700;
  font-size: 0.75rem;
  padding: 4px 10px;
  border-radius: 999px;
}

.learn-nav-link {
  color: var(--learn-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.15s;
}

.learn-nav-link:hover { color: var(--learn-accent); }

/* ── XP bar ── */
.learn-xp-bar-wrap {
  height: 4px;
  background: var(--learn-surface-2);
  position: sticky;
  top: var(--learn-nav-h);
  z-index: 99;
}

.learn-xp-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--learn-accent), var(--learn-accent-2));
  transition: width 0.5s ease;
  box-shadow: 0 0 8px rgba(66, 211, 146, 0.5);
}

/* ── Hero ── */
.learn-hero {
  text-align: center;
  padding: clamp(48px, 8vw, 80px) 24px 40px;
  max-width: 720px;
  margin: 0 auto;
}

.learn-hero-eyebrow {
  font-family: var(--learn-pixel);
  font-size: clamp(0.5rem, 2vw, 0.65rem);
  color: var(--learn-accent);
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

.learn-hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  margin: 0 0 12px;
  background: linear-gradient(135deg, #fff 30%, var(--learn-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.learn-hero p {
  color: var(--learn-muted);
  font-size: 1.1rem;
  margin: 0 0 32px;
}

/* ── Buttons ── */
.learn-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--learn-radius);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: transform 0.15s, box-shadow 0.15s;
  font-family: var(--learn-font);
}

.learn-btn:active { transform: scale(0.97); }

.learn-btn-primary {
  background: linear-gradient(135deg, var(--learn-accent), #3ecfb6);
  color: #0a0e1a;
  box-shadow: 0 4px 20px rgba(66, 211, 146, 0.35);
}

.learn-btn-primary:hover { box-shadow: 0 6px 28px rgba(66, 211, 146, 0.5); }

.learn-btn-ghost {
  background: transparent;
  color: var(--learn-text);
  border: 1px solid var(--learn-border);
}

.learn-btn-ghost:hover { border-color: var(--learn-accent); color: var(--learn-accent); }

.learn-btn-secondary {
  background: transparent;
  border: 1px solid var(--learn-border);
  color: var(--learn-muted);
}

.learn-btn-secondary:hover {
  border-color: var(--learn-accent);
  color: var(--learn-text);
}

.learn-btn-run {
  background: var(--learn-accent-2);
  color: #0a0e1a;
}

.learn-btn-submit {
  background: var(--learn-accent);
  color: #0a0e1a;
}

.learn-btn-sm { padding: 8px 16px; font-size: 0.85rem; }

.learn-btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ── Course cards ── */
.learn-courses {
  display: grid;
  gap: 20px;
  max-width: 800px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

.learn-course-card {
  background: var(--learn-surface);
  border: 1px solid var(--learn-border);
  border-radius: 16px;
  padding: 28px;
  display: flex;
  gap: 20px;
  align-items: flex-start;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s, transform 0.2s;
}

.learn-course-card:hover {
  border-color: var(--learn-accent);
  transform: translateY(-2px);
}

.learn-course-icon { font-size: 2.5rem; flex-shrink: 0; }

.learn-course-card h2 { margin: 0 0 6px; font-size: 1.25rem; }

.learn-course-card p { margin: 0 0 12px; color: var(--learn-muted); font-size: 0.9rem; }

.learn-course-meta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.learn-tag {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 3px 10px;
  border-radius: 999px;
  text-transform: uppercase;
}

.learn-tag-beginner { background: rgba(66, 211, 146, 0.15); color: var(--learn-accent); }
.learn-tag-intermediate { background: rgba(94, 184, 255, 0.15); color: var(--learn-accent-2); }
.learn-tag-advanced { background: rgba(192, 132, 252, 0.15); color: var(--learn-purple); }
.learn-tag-pro { background: rgba(245, 158, 11, 0.15); color: #f59e0b; }

/* ── Course map ── */
.learn-map-page { max-width: 900px; margin: 0 auto; padding: 32px 24px 80px; }

.learn-map-header { margin-bottom: 40px; }

.learn-map-header h1 { font-size: 1.75rem; margin: 0 0 8px; display: flex; align-items: center; gap: 12px; }

.learn-map-progress {
  color: var(--learn-muted);
  font-size: 0.9rem;
  margin-bottom: 8px;
}

.learn-track {
  margin-bottom: 48px;
}

.learn-track-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--learn-border);
}

.learn-track-header h2 { margin: 0; font-size: 1.1rem; }

.learn-region {
  margin-bottom: 28px;
}

.learn-region-name {
  font-family: var(--learn-pixel);
  font-size: 0.55rem;
  color: var(--learn-muted);
  letter-spacing: 0.08em;
  margin-bottom: 12px;
  text-transform: uppercase;
}

.learn-lesson-grid {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.learn-lesson-node {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  background: var(--learn-surface);
  border: 1px solid var(--learn-border);
  border-radius: var(--learn-radius);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s, background 0.15s;
  position: relative;
}

.learn-lesson-node:hover:not(.locked) {
  border-color: var(--learn-accent);
  background: var(--learn-surface-2);
}

.learn-lesson-node.complete {
  border-color: rgba(66, 211, 146, 0.4);
  background: rgba(66, 211, 146, 0.06);
}

.learn-lesson-node.locked {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}

.learn-lesson-node.current {
  border-color: var(--learn-accent-2);
  box-shadow: 0 0 0 1px rgba(94, 184, 255, 0.3);
}

.learn-node-num {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--learn-surface-2);
  border: 2px solid var(--learn-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  flex-shrink: 0;
}

.learn-lesson-node.complete .learn-node-num {
  background: var(--learn-accent);
  border-color: var(--learn-accent);
  color: #0a0e1a;
}

.learn-node-info { flex: 1; min-width: 0; }

.learn-node-title { font-weight: 600; font-size: 0.95rem; }

.learn-node-xp { font-size: 0.8rem; color: var(--learn-gold); flex-shrink: 0; }

.learn-check { color: var(--learn-accent); font-size: 1.1rem; }

/* ── Lesson player ── */
.learn-lesson-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: calc(100vh - var(--learn-nav-h) - 4px);
}

@media (max-width: 900px) {
  .learn-lesson-layout { grid-template-columns: 1fr; }
}

.learn-panel {
  padding: 24px;
  overflow-y: auto;
  max-height: calc(100vh - var(--learn-nav-h) - 4px);
}

.learn-panel-instructions {
  background: var(--learn-bg);
  border-right: 1px solid var(--learn-border);
}

.learn-panel-code {
  background: var(--learn-surface);
  display: flex;
  flex-direction: column;
}

.learn-lesson-breadcrumb {
  font-size: 0.8rem;
  color: var(--learn-muted);
  margin-bottom: 16px;
}

.learn-lesson-breadcrumb a { color: var(--learn-accent-2); text-decoration: none; }

.learn-lesson-title {
  font-size: 1.4rem;
  font-weight: 700;
  margin: 0 0 8px;
}

.learn-lesson-track-tag { margin-bottom: 20px; }

.learn-instructions {
  font-size: 0.95rem;
  line-height: 1.7;
}

.learn-instructions code {
  background: var(--learn-surface-2);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--learn-mono);
  font-size: 0.85em;
  color: var(--learn-accent);
}

/* Structured lesson tutorials */
.learn-tutorial {
  margin-bottom: 8px;
}

.learn-tutorial-overview {
  font-size: 1rem;
  color: var(--learn-text);
  margin: 0 0 16px;
  line-height: 1.6;
}

.learn-tutorial-toc {
  background: rgba(94, 184, 255, 0.06);
  border: 1px solid rgba(94, 184, 255, 0.2);
  border-radius: 10px;
  padding: 12px 16px;
  margin-bottom: 20px;
}

.learn-tutorial-toc p {
  margin: 0 0 8px;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--learn-accent);
}

.learn-tutorial-toc ul {
  margin: 0;
  padding-left: 18px;
  font-size: 0.88rem;
}

.learn-tutorial-toc a {
  color: var(--learn-accent-2);
  text-decoration: none;
}

.learn-tutorial-toc a:hover {
  text-decoration: underline;
}

.learn-tutorial-section {
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--learn-border);
}

.learn-tutorial-section:last-of-type {
  border-bottom: none;
}

.learn-tutorial-section h3 {
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 10px;
  color: var(--learn-text);
}

.learn-tutorial-topics {
  margin: 0 0 12px;
  padding-left: 20px;
  font-size: 0.88rem;
  color: var(--learn-muted);
  line-height: 1.55;
}

.learn-tutorial-topics li {
  margin-bottom: 4px;
}

.learn-tutorial-example {
  margin-bottom: 12px;
}

.learn-tutorial-example pre {
  margin: 0;
  padding: 12px 14px;
  background: var(--learn-surface-2);
  border: 1px solid var(--learn-border);
  border-radius: 8px;
  overflow-x: auto;
}

.learn-tutorial-example pre code {
  background: none;
  padding: 0;
  color: var(--learn-accent-2);
  font-size: 0.82rem;
  white-space: pre;
}

.learn-tutorial-note {
  font-size: 0.78rem;
  color: var(--learn-muted);
  margin: 6px 0 0;
  font-style: italic;
}

.learn-tutorial-challenge {
  margin-top: 8px;
  padding: 16px;
  background: rgba(66, 211, 146, 0.08);
  border: 1px solid rgba(66, 211, 146, 0.25);
  border-radius: 10px;
}

.learn-tutorial-challenge h3 {
  margin: 0 0 10px;
  font-size: 1rem;
  color: var(--learn-accent-2);
}

.learn-tutorial-detail {
  margin: 14px 0 0;
  padding: 12px 14px;
  background: rgba(192, 132, 252, 0.06);
  border: 1px solid rgba(192, 132, 252, 0.2);
  border-radius: 8px;
  border-left: 3px solid #c084fc;
}

.learn-tutorial-detail h4 {
  margin: 0 0 8px;
  font-size: 0.9rem;
  font-weight: 700;
  color: #d8b4fe;
}

.learn-tutorial-detail .learn-tutorial-topics {
  font-size: 0.84rem;
}

.learn-tutorial-compare {
  width: 100%;
  border-collapse: collapse;
  margin: 10px 0 4px;
  font-size: 0.82rem;
}

.learn-tutorial-compare th,
.learn-tutorial-compare td {
  border: 1px solid var(--learn-border);
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
}

.learn-tutorial-compare th {
  background: rgba(255, 255, 255, 0.04);
  color: var(--learn-accent);
  font-weight: 600;
}

.learn-tutorial-compare td code {
  font-size: 0.8rem;
}

.learn-hint-box {
  margin-top: 20px;
  padding: 14px;
  background: rgba(251, 191, 36, 0.08);
  border: 1px solid rgba(251, 191, 36, 0.25);
  border-radius: var(--learn-radius);
  font-size: 0.9rem;
  display: none;
}

.learn-hint-box.visible { display: block; }

.learn-hint-box strong { color: var(--learn-gold); }

.learn-hint-intro { margin: 0 0 12px; }

.learn-hint-list { display: flex; flex-direction: column; gap: 12px; }

.learn-hint-item {
  background: rgba(0, 0, 0, 0.25);
  border-radius: 8px;
  padding: 10px 12px;
  border: 1px solid rgba(251, 191, 36, 0.15);
}

.learn-hint-item-title {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--learn-gold);
  margin-bottom: 6px;
}

.learn-hint-code {
  margin: 0;
  font-family: var(--learn-mono);
  font-size: 0.8rem;
  line-height: 1.5;
  color: #e6edf3;
  white-space: pre-wrap;
  word-break: break-word;
  overflow-x: auto;
}

.learn-editor-toolbar {
  display: flex;
  gap: 8px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--learn-border);
  align-items: center;
}

.learn-editor-toolbar span {
  font-family: var(--learn-mono);
  font-size: 0.8rem;
  color: var(--learn-muted);
  flex: 1;
}

.learn-editor-wrap {
  flex: 1;
  min-height: 240px;
  position: relative;
}

.learn-editor-wrap .CodeMirror {
  height: 100% !important;
  min-height: 240px;
  font-family: var(--learn-mono) !important;
  font-size: 14px !important;
  line-height: 1.6 !important;
  background: #0d1117 !important;
}

.learn-console {
  border-top: 1px solid var(--learn-border);
  background: #0d1117;
  min-height: 120px;
  max-height: 200px;
  overflow-y: auto;
  padding: 12px 16px;
  font-family: var(--learn-mono);
  font-size: 13px;
  white-space: pre-wrap;
  word-break: break-word;
}

.learn-console-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--learn-muted);
  margin-bottom: 6px;
}

.learn-console-output { color: #e6edf3; }

.learn-console-error { color: var(--learn-danger); }

.learn-console-success { color: var(--learn-accent); }

.learn-console-empty { color: var(--learn-muted); font-style: italic; }

.learn-pyodide-loading {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  background: var(--learn-surface-2);
  border-bottom: 1px solid var(--learn-border);
  font-size: 0.85rem;
  color: var(--learn-muted);
}

.learn-pyodide-loading.hidden { display: none; }

.learn-spinner {
  width: 16px;
  height: 16px;
  border: 2px solid var(--learn-border);
  border-top-color: var(--learn-accent);
  border-radius: 50%;
  animation: learn-spin 0.7s linear infinite;
}

@keyframes learn-spin { to { transform: rotate(360deg); } }

/* ── Success modal ── */
.learn-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s;
}

.learn-modal-overlay.visible {
  opacity: 1;
  pointer-events: auto;
}

.learn-modal {
  background: var(--learn-surface);
  border: 1px solid var(--learn-border);
  border-radius: 20px;
  padding: 40px;
  text-align: center;
  max-width: 400px;
  width: 90%;
  transform: scale(0.9);
  transition: transform 0.25s;
}

.learn-modal-overlay.visible .learn-modal { transform: scale(1); }

.learn-modal-icon { font-size: 3rem; margin-bottom: 12px; }

.learn-modal h2 { margin: 0 0 8px; font-size: 1.5rem; }

.learn-modal-xp {
  font-size: 1.25rem;
  color: var(--learn-gold);
  font-weight: 700;
  margin: 12px 0;
}

.learn-modal p { color: var(--learn-muted); margin: 0 0 24px; }

.learn-badges-section {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 24px 60px;
}

.learn-badges-section h2 { font-size: 1.1rem; margin-bottom: 16px; }

.learn-badges-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 12px;
}

.learn-badge {
  background: var(--learn-surface);
  border: 1px solid var(--learn-border);
  border-radius: var(--learn-radius);
  padding: 16px;
  text-align: center;
  opacity: 0.35;
  filter: grayscale(1);
  transition: opacity 0.2s, filter 0.2s;
}

.learn-badge.earned {
  opacity: 1;
  filter: none;
  border-color: rgba(251, 191, 36, 0.4);
}

.learn-badge-icon { font-size: 1.75rem; margin-bottom: 6px; }

.learn-badge-name { font-size: 0.8rem; font-weight: 600; }

.learn-badge-desc { font-size: 0.7rem; color: var(--learn-muted); margin-top: 4px; }

.learn-footer {
  text-align: center;
  padding: 24px;
  color: var(--learn-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--learn-border);
}

.learn-footer a { color: var(--learn-accent-2); }

/* ── Python Terminal ── */
.mbs-terminal {
  display: flex;
  flex-direction: column;
  background: #0a0e14;
  border-top: 1px solid var(--learn-border);
  min-height: 200px;
  flex: 1;
  font-family: var(--learn-mono);
  font-size: 13px;
}

.mbs-terminal-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  background: #111820;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  flex-shrink: 0;
}

.mbs-terminal-title {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--learn-muted);
}

.mbs-terminal-status {
  font-size: 0.75rem;
  color: var(--learn-accent);
  flex: 1;
}

.mbs-terminal-actions { display: flex; gap: 6px; }

.mbs-term-btn {
  background: transparent;
  border: 1px solid var(--learn-border);
  color: var(--learn-muted);
  font-size: 0.7rem;
  padding: 3px 8px;
  border-radius: 6px;
  cursor: pointer;
  font-family: var(--learn-font);
}

.mbs-term-btn:hover {
  border-color: var(--learn-accent-2);
  color: var(--learn-text);
}

.mbs-terminal-output {
  flex: 1;
  overflow-y: auto;
  padding: 10px 12px;
  min-height: 120px;
}

.mbs-terminal-line {
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.5;
  margin-bottom: 2px;
}

.mbs-term-system { color: #6b7a94; font-style: italic; }
.mbs-term-stdout { color: #e6edf3; }
.mbs-term-stderr { color: #fbbf24; }
.mbs-term-error { color: var(--learn-danger); }
.mbs-term-success { color: var(--learn-accent); font-weight: 600; }
.mbs-term-result { color: #7dd3fc; }
.mbs-term-input-echo { color: #c9d1d9; }

.mbs-terminal-prompt-inline {
  color: var(--learn-accent);
  user-select: none;
}

.mbs-terminal-input-row {
  display: flex;
  align-items: flex-start;
  padding: 8px 12px 10px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  background: #0d1117;
  flex-shrink: 0;
}

.mbs-terminal-prompt {
  color: var(--learn-accent);
  padding-top: 4px;
  user-select: none;
  flex-shrink: 0;
}

.mbs-terminal-input {
  flex: 1;
  background: transparent;
  border: none;
  color: #e6edf3;
  font-family: var(--learn-mono);
  font-size: 13px;
  line-height: 1.5;
  resize: none;
  outline: none;
  min-height: 22px;
  max-height: 120px;
}

.mbs-terminal-input:disabled { opacity: 0.5; }

.learn-lesson-layout {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  height: calc(100vh - var(--learn-nav-h) - 4px);
  overflow: hidden;
}

.learn-panel-code {
  display: flex;
  flex-direction: column;
  min-height: 0;
  padding: 0 !important;
}

.learn-panel-instructions { max-height: calc(100vh - var(--learn-nav-h) - 4px); }

.learn-editor-wrap {
  min-height: 180px;
  max-height: 38vh;
  flex-shrink: 0;
}

.learn-editor-wrap .CodeMirror {
  min-height: 180px !important;
}

.learn-terminal-page {
  display: flex;
  flex-direction: column;
  height: calc(100vh - var(--learn-nav-h) - 4px);
}

.learn-terminal-page .mbs-terminal {
  flex: 1;
  border-top: none;
}

/* ── Projects ── */
.learn-map-sub {
  color: var(--learn-muted);
  font-size: 0.95rem;
  margin: 8px 0 16px;
  max-width: 600px;
}

.learn-project-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
}

.learn-filter-btn {
  padding: 8px 16px;
  border-radius: 20px;
  border: 1px solid var(--learn-border);
  background: var(--learn-surface);
  color: var(--learn-text);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.15s;
}

.learn-filter-btn:hover { border-color: var(--learn-accent); }

.learn-filter-btn.active {
  background: var(--learn-accent);
  color: #0a0e1a;
  border-color: var(--learn-accent);
  font-weight: 600;
}

.learn-project-section { margin-bottom: 36px; }

.learn-project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.learn-project-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px;
  background: var(--learn-surface);
  border: 1px solid var(--learn-border);
  border-radius: var(--learn-radius);
  text-decoration: none;
  color: inherit;
  transition: all 0.15s;
  position: relative;
}

.learn-project-card:hover:not(.locked) {
  border-color: var(--learn-accent);
  transform: translateY(-2px);
}

.learn-project-card.locked {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}

.learn-project-card.complete { border-color: rgba(74, 222, 128, 0.4); }

.learn-project-card.current {
  border-color: var(--learn-accent-2);
  box-shadow: 0 0 0 1px var(--learn-accent-2);
}

.learn-project-icon { font-size: 1.8rem; flex-shrink: 0; }

.learn-project-info { flex: 1; min-width: 0; }

.learn-project-title {
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 6px;
}

.learn-project-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.75rem;
  color: var(--learn-muted);
  align-items: center;
}

.learn-project-badge {
  position: absolute;
  top: 8px;
  right: 8px;
  font-size: 0.7rem;
  color: var(--learn-accent);
  font-weight: 600;
}

.learn-project-layout {
  display: grid;
  grid-template-columns: 220px 1fr 1fr;
  gap: 0;
  height: calc(100vh - var(--learn-nav-h) - 4px);
  overflow: hidden;
}

.learn-panel-steps {
  background: var(--learn-surface);
  border-right: 1px solid var(--learn-border);
  padding: 20px 16px;
  overflow-y: auto;
}

.learn-steps-header {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--learn-muted);
  margin-bottom: 16px;
}

.learn-step-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 8px;
  margin-bottom: 4px;
  font-size: 0.85rem;
  transition: background 0.15s;
}

.learn-step-item.active {
  background: rgba(94, 184, 255, 0.12);
  border: 1px solid rgba(94, 184, 255, 0.3);
}

.learn-step-item.done { color: var(--learn-accent); }

.learn-step-num {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--learn-surface-2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 700;
  flex-shrink: 0;
}

.learn-step-item.done .learn-step-num {
  background: rgba(74, 222, 128, 0.2);
  color: var(--learn-accent);
}

.learn-step-item.active .learn-step-num {
  background: var(--learn-accent-2);
  color: #0a0e1a;
}

.learn-step-name { line-height: 1.3; }

.learn-project-overview {
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--learn-border);
}

.learn-step-panel {
  background: rgba(94, 184, 255, 0.06);
  border: 1px solid rgba(94, 184, 255, 0.2);
  border-radius: var(--learn-radius);
  padding: 16px;
  margin-top: 12px;
}

.learn-step-panel h3 {
  margin: 0 0 10px;
  font-size: 1rem;
  color: var(--learn-accent-2);
}

.learn-step-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--learn-accent-2);
  margin-bottom: 8px;
}

.learn-project-done {
  margin-top: 16px;
  padding: 12px;
  background: rgba(74, 222, 128, 0.1);
  border-radius: 8px;
  color: var(--learn-accent);
  font-weight: 500;
}

.learn-project-hint {
  margin-top: 16px;
  font-size: 0.85rem;
  color: var(--learn-muted);
  line-height: 1.5;
}

.learn-project-hint strong { color: var(--learn-accent-2); }

/* ── Progress backup ── */
.learn-progress-card { cursor: default; }

.learn-progress-summary {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin: 16px 0 12px;
}

.learn-progress-stat {
  display: flex;
  flex-direction: column;
  min-width: 80px;
}

.learn-progress-stat strong {
  font-size: 1.4rem;
  color: var(--learn-accent);
}

.learn-progress-stat span {
  font-size: 0.75rem;
  color: var(--learn-muted);
}

.learn-progress-saved {
  font-size: 0.8rem;
  color: var(--learn-muted);
  margin: 0 0 12px;
}

.learn-progress-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.learn-btn-file {
  cursor: pointer;
  display: inline-flex;
  align-items: center;
}

.learn-progress-msg {
  margin-top: 12px;
  font-size: 0.85rem;
  font-weight: 500;
}

.learn-progress-msg.success { color: var(--learn-accent); }
.learn-progress-msg.error { color: #f87171; }

.learn-save-status {
  font-size: 0.75rem;
  color: var(--learn-accent);
  opacity: 0;
  transition: opacity 0.3s;
  margin-left: 8px;
}

.learn-save-status.visible { opacity: 1; }

/* ── Project prerequisite gate ── */
.learn-prereq-banner {
  border-radius: var(--learn-radius);
  padding: 20px 24px;
  margin-bottom: 24px;
}

.learn-prereq-locked {
  background: rgba(251, 191, 36, 0.08);
  border: 1px solid rgba(251, 191, 36, 0.3);
}

.learn-prereq-locked h3 {
  margin: 0 0 8px;
  font-size: 1.1rem;
  color: var(--learn-gold);
}

.learn-prereq-locked p {
  margin: 0 0 16px;
  color: var(--learn-muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

.learn-prereq-unlocked {
  background: rgba(74, 222, 128, 0.08);
  border: 1px solid rgba(74, 222, 128, 0.3);
  color: var(--learn-accent);
  font-size: 0.95rem;
}

.learn-prereq-progress {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  font-size: 0.85rem;
  color: var(--learn-muted);
}

.learn-prereq-bar {
  flex: 1;
  max-width: 200px;
  height: 8px;
  background: var(--learn-surface-2);
  border-radius: 4px;
  overflow: hidden;
}

.learn-prereq-fill {
  height: 100%;
  background: var(--learn-gold);
  border-radius: 4px;
  transition: width 0.3s;
}

.learn-concept-lesson-link {
  font-size: 0.8rem;
  color: var(--learn-accent-2);
  text-decoration: none;
  margin-left: 12px;
}

.learn-concept-lesson-link:hover { text-decoration: underline; }

.learn-concept-desc {
  font-size: 0.85rem;
  color: var(--learn-muted);
  margin: 0 0 12px;
}

.learn-project-scenario {
  font-size: 0.75rem;
  color: var(--learn-accent-2);
  margin-bottom: 4px;
  font-style: italic;
}

.learn-project-scenario-tag {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--learn-gold);
  background: rgba(251, 191, 36, 0.1);
  padding: 6px 12px;
  border-radius: 6px;
  margin-bottom: 12px;
}

.learn-project-concept-link {
  margin-top: 12px;
  font-size: 0.85rem;
}

.learn-project-concept-link a {
  color: var(--learn-accent-2);
  text-decoration: none;
}

.learn-project-concept-link a:hover { text-decoration: underline; }

.learn-project-level {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--learn-accent);
  background: rgba(94, 184, 255, 0.12);
  padding: 4px 10px;
  border-radius: 6px;
  margin-bottom: 12px;
}

.learn-beginner-tip {
  font-size: 0.88rem;
  color: var(--learn-accent-2);
  background: rgba(66, 211, 146, 0.08);
  border-left: 3px solid var(--learn-accent-2);
  padding: 10px 14px;
  border-radius: 0 8px 8px 0;
  margin: 12px 0 0;
}

.learn-recap-box {
  background: rgba(94, 184, 255, 0.08);
  border: 1px solid rgba(94, 184, 255, 0.25);
  border-radius: 10px;
  padding: 14px 16px;
  margin-bottom: 16px;
}

.learn-recap-title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--learn-accent);
  margin-bottom: 10px;
}

.learn-recap-list {
  margin: 0;
  padding-left: 18px;
  font-size: 0.88rem;
  color: var(--learn-text);
  line-height: 1.55;
}

.learn-recap-list li {
  margin-bottom: 8px;
}

.learn-recap-list li:last-child {
  margin-bottom: 0;
}

.learn-recap-list code {
  font-size: 0.82rem;
  color: var(--learn-accent-2);
}

.learn-recap-hint {
  font-size: 0.8rem;
  color: var(--learn-muted);
  margin: 10px 0 0;
  font-style: italic;
}

.learn-project-skills,
.learn-project-skills-panel {
  font-size: 0.82rem;
  color: var(--learn-muted);
  margin-top: 8px;
}

.learn-project-skills-panel {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--learn-border);
  border-radius: 8px;
  padding: 10px 14px;
  margin-top: 12px;
}

.learn-project-skills-panel code {
  font-size: 0.8rem;
  color: var(--learn-accent-2);
  margin-right: 6px;
}

.learn-project-level-badge {
  position: absolute;
  top: 8px;
  right: 8px;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--learn-muted);
  background: rgba(255, 255, 255, 0.06);
  padding: 3px 7px;
  border-radius: 4px;
}

.learn-project-card { position: relative; }

.learn-project-lock-reason {
  font-size: 0.72rem;
  color: var(--learn-muted);
  margin-top: 6px;
}

.learn-concept-desc {
  font-size: 0.85rem;
  color: var(--learn-muted);
  margin: 0 0 12px;
}

.learn-concept-lesson-link {
  font-size: 0.8rem;
  color: var(--learn-accent-2);
  text-decoration: none;
  margin-left: 12px;
}

.learn-concept-lesson-link:hover { text-decoration: underline; }

.learn-lang-grid {
  display: grid;
  gap: 16px;
  margin-bottom: 40px;
}

.learn-lang-card .learn-course-icon {
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.learn-lang-progress {
  font-size: 0.85rem;
  color: var(--learn-accent-2);
  margin-bottom: 8px;
}

.learn-lang-soon {
  opacity: 0.85;
}

.learn-lang-soon-badge {
  font-size: 0.8rem;
  color: var(--learn-gold);
  margin-bottom: 8px;
}

.learn-lang-breadcrumb {
  font-size: 0.85rem;
  color: var(--learn-muted);
  margin-bottom: 8px;
}

.learn-lang-breadcrumb a {
  color: var(--learn-accent-2);
  text-decoration: none;
}

.learn-lang-breadcrumb a:hover { text-decoration: underline; }

.learn-hub-note {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--learn-border);
  border-radius: 12px;
  padding: 24px 28px;
  margin-top: 8px;
}

.learn-hub-note h2 {
  margin: 0 0 12px;
  font-size: 1.1rem;
}

.learn-hub-steps {
  margin: 0;
  padding-left: 20px;
  color: var(--learn-muted);
  line-height: 1.8;
}

.learn-node-build-link {
  font-size: 0.7rem;
  color: var(--learn-accent-2);
  margin-top: 2px;
}

.learn-modal-build-hint {
  font-size: 0.9rem;
  color: var(--learn-accent-2);
  margin: 0 0 12px;
}

.learn-modal .learn-btn-secondary {
  margin-top: 8px;
}

@media (max-width: 900px) {
  .learn-lesson-layout {
    grid-template-columns: 1fr;
    height: auto;
    overflow: visible;
  }

  .learn-project-layout {
    grid-template-columns: 1fr;
    height: auto;
    overflow: visible;
  }

  .learn-panel-steps {
    border-right: none;
    border-bottom: 1px solid var(--learn-border);
    max-height: 200px;
  }
}