/* ============================================================
   Prism Playground — design system
   Dark-first, IDE-flavoured, light theme supported.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&family=Space+Grotesk:wght@500;600;700&display=swap');

:root {
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-head: 'Space Grotesk', 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, monospace;

  --bg: #0a0d12;
  --bg-panel: #11161e;
  --bg-panel-2: #161c26;
  --bg-raised: #1c2431;
  --bg-input: #0e1319;

  --text: #e6edf3;
  --text-dim: #9aa6b5;
  --text-faint: #626e7e;

  --border: #1f2733;
  --border-strong: #2b3543;

  --gold: #c9903a;
  --gold-soft: #e0aa50;
  --blue: #2e7eb4;
  --blue-soft: #4a9fd6;

  --green: #22c55e;
  --amber: #eab308;
  --orange: #f97316;
  --red: #ef4444;
  --purple: #a855f7;

  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 18px;
  --radius-full: 999px;

  --shadow-md: 0 6px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.5);

  --sidebar-w: 232px;
  --topbar-h: 60px;

  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

:root[data-theme='light'] {
  --bg: #f7f8fa;
  --bg-panel: #ffffff;
  --bg-panel-2: #f2f4f7;
  --bg-raised: #e9edf2;
  --bg-input: #ffffff;

  --text: #0f1720;
  --text-dim: #4a5563;
  --text-faint: #7c8794;

  --border: #e2e6ec;
  --border-strong: #cdd4dd;

  --shadow-md: 0 6px 24px rgba(15, 23, 32, 0.08);
  --shadow-lg: 0 18px 48px rgba(15, 23, 32, 0.12);
}

/* ---------------------------------------------------------------- reset */

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

html, body { height: 100%; }

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  font-size: 15px;
  line-height: 1.55;
}

h1, h2, h3, h4 { font-family: var(--font-head); margin: 0; line-height: 1.2; letter-spacing: -0.015em; }
p { margin: 0; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; border: none; background: none; }
code, pre, kbd { font-family: var(--font-mono); }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 99px; border: 2px solid var(--bg); }
::-webkit-scrollbar-thumb:hover { background: var(--text-faint); }

:focus-visible { outline: 2px solid var(--blue-soft); outline-offset: 2px; border-radius: 4px; }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* ---------------------------------------------------------------- layout */

.app {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: 100vh;
}

/* ---- sidebar ---- */

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  background: var(--bg-panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 18px 12px;
  gap: 4px;
  overflow-y: auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 10px 18px;
}

.brand-mark { flex-shrink: 0; filter: drop-shadow(0 0 8px rgba(201, 144, 58, 0.3)); }

.brand-text { font-family: var(--font-head); font-weight: 700; font-size: 1.02rem; letter-spacing: -0.02em; }
.brand-text span { color: var(--gold); }
.brand-sub { display: block; font-family: var(--font-sans); font-size: 0.66rem; font-weight: 500; color: var(--text-faint); letter-spacing: 0.09em; text-transform: uppercase; }

.nav-group-label {
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--text-faint);
  padding: 16px 12px 6px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  font-size: 0.885rem;
  font-weight: 500;
  transition: background var(--ease) 150ms, color var(--ease) 150ms;
  position: relative;
}

.nav-item:hover { background: var(--bg-panel-2); color: var(--text); }

.nav-item.active { background: var(--bg-raised); color: var(--text); font-weight: 600; }
.nav-item.active::before {
  content: '';
  position: absolute; left: 0; top: 20%; bottom: 20%;
  width: 3px; border-radius: 0 3px 3px 0;
  background: linear-gradient(180deg, var(--gold-soft), var(--blue));
}

.nav-glyph {
  width: 22px; height: 22px; flex-shrink: 0;
  display: grid; place-items: center;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.6rem; font-weight: 700; letter-spacing: 0.02em;
  background: var(--bg-raised);
  color: var(--text-dim);
}

.nav-item.active .nav-glyph { color: #fff; }

.nav-meter { margin-left: auto; font-size: 0.7rem; font-family: var(--font-mono); color: var(--text-faint); }

.sidebar-foot { margin-top: auto; padding-top: 16px; display: flex; flex-direction: column; gap: 4px; }

/* ---- topbar ---- */

.main { display: flex; flex-direction: column; min-width: 0; }

.topbar {
  height: var(--topbar-h);
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg-panel) 88%, transparent);
  backdrop-filter: blur(14px);
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 22px;
  position: sticky;
  top: 0;
  z-index: 40;
}

.topbar-title { font-family: var(--font-head); font-weight: 600; font-size: 0.98rem; }
.topbar-spacer { margin-left: auto; }

.stat-chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 11px;
  border-radius: var(--radius-full);
  background: var(--bg-panel-2);
  border: 1px solid var(--border);
  font-size: 0.78rem;
  font-weight: 600;
  white-space: nowrap;
}

.stat-chip .label { color: var(--text-faint); font-weight: 500; }
.stat-chip .value { font-family: var(--font-mono); }

.level-orb {
  width: 26px; height: 26px; border-radius: 50%;
  display: grid; place-items: center;
  font-size: 0.68rem; font-weight: 700; font-family: var(--font-mono);
  background: conic-gradient(var(--gold-soft) var(--p, 0%), var(--bg-raised) 0);
  color: var(--text);
  position: relative;
}
.level-orb::after {
  content: ''; position: absolute; inset: 3px; border-radius: 50%; background: var(--bg-panel);
}
.level-orb span { position: relative; z-index: 1; }

.icon-btn {
  width: 34px; height: 34px;
  display: grid; place-items: center;
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  transition: background var(--ease) 150ms, color var(--ease) 150ms;
}
.icon-btn:hover { background: var(--bg-panel-2); color: var(--text); }

/* ---- view ---- */

.view { padding: 30px 34px 64px; max-width: 1240px; width: 100%; }
.view.wide { max-width: none; padding: 0; }

.page-head { margin-bottom: 26px; }
.page-head h1 { font-size: 1.75rem; margin-bottom: 6px; }
.page-head p { color: var(--text-dim); font-size: 0.93rem; max-width: 68ch; }

.eyebrow {
  font-size: 0.68rem; font-weight: 700; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--gold); margin-bottom: 8px;
}

/* ---------------------------------------------------------------- pieces */

.card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

.card-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 14px; }
.card-head h3 { font-size: 0.95rem; }
.card-head .hint { font-size: 0.76rem; color: var(--text-faint); }

.grid { display: grid; gap: 16px; }
.grid.cols-2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid.cols-3 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.grid.cols-4 { grid-template-columns: repeat(auto-fit, minmax(178px, 1fr)); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.855rem;
  font-weight: 600;
  background: var(--bg-raised);
  border: 1px solid var(--border-strong);
  color: var(--text);
  transition: transform var(--ease) 120ms, background var(--ease) 150ms, border-color var(--ease) 150ms, opacity var(--ease) 150ms;
  white-space: nowrap;
}
.btn:hover:not(:disabled) { background: var(--bg-panel-2); border-color: var(--text-faint); }
.btn:active:not(:disabled) { transform: translateY(1px); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }

.btn.primary {
  background: linear-gradient(135deg, var(--gold), #b87f2c);
  border-color: transparent;
  color: #12100b;
}
.btn.primary:hover:not(:disabled) { background: linear-gradient(135deg, var(--gold-soft), var(--gold)); border-color: transparent; }

.btn.accent {
  background: linear-gradient(135deg, var(--blue-soft), var(--blue));
  border-color: transparent;
  color: #061119;
}

.btn.ghost { background: transparent; border-color: var(--border); color: var(--text-dim); }
.btn.ghost:hover:not(:disabled) { color: var(--text); background: var(--bg-panel-2); }

.btn.sm { padding: 6px 11px; font-size: 0.78rem; }
.btn.block { width: 100%; }

.pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 3px 9px; border-radius: var(--radius-full);
  font-size: 0.7rem; font-weight: 600;
  background: var(--bg-raised); color: var(--text-dim);
  border: 1px solid var(--border);
  white-space: nowrap;
}
.pill.solid { border-color: transparent; }
.pill .dot { width: 6px; height: 6px; border-radius: 50%; background: currentColor; }

.progress-track { height: 6px; border-radius: 99px; background: var(--bg-raised); overflow: hidden; }
.progress-fill { height: 100%; border-radius: 99px; background: linear-gradient(90deg, var(--gold), var(--blue-soft)); transition: width 500ms var(--ease); }

.empty-state { text-align: center; padding: 48px 20px; color: var(--text-faint); }
.empty-state h3 { color: var(--text-dim); margin-bottom: 8px; font-size: 1rem; }

/* ---------------------------------------------------------------- dashboard */

.hero {
  background:
    radial-gradient(900px 320px at 12% -20%, rgba(201, 144, 58, 0.14), transparent 62%),
    radial-gradient(700px 300px at 88% 0%, rgba(46, 126, 180, 0.16), transparent 60%),
    var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 30px 32px;
  margin-bottom: 22px;
}

.hero h1 { font-size: 1.9rem; margin-bottom: 8px; }
.hero p { color: var(--text-dim); max-width: 62ch; font-size: 0.94rem; }
.hero-stats { display: flex; flex-wrap: wrap; gap: 26px; margin-top: 24px; }

.hero-stat .n { font-family: var(--font-mono); font-size: 1.55rem; font-weight: 600; line-height: 1.1; }
.hero-stat .k { font-size: 0.72rem; color: var(--text-faint); text-transform: uppercase; letter-spacing: 0.08em; font-weight: 600; margin-top: 3px; }

.xp-bar { margin-top: 22px; max-width: 460px; }
.xp-bar-head { display: flex; justify-content: space-between; font-size: 0.76rem; color: var(--text-dim); margin-bottom: 7px; }

/* track cards */

.track-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 13px;
  transition: transform var(--ease) 180ms, border-color var(--ease) 180ms, box-shadow var(--ease) 180ms;
  position: relative;
  overflow: hidden;
}
.track-card::after {
  content: ''; position: absolute; inset: 0 0 auto 0; height: 2px;
  background: var(--accent, var(--gold)); opacity: 0.85;
}
.track-card:hover { transform: translateY(-3px); border-color: var(--border-strong); box-shadow: var(--shadow-md); }

.track-card-head { display: flex; align-items: center; gap: 11px; }
.track-glyph {
  width: 38px; height: 38px; border-radius: 10px;
  display: grid; place-items: center;
  font-family: var(--font-mono); font-weight: 700; font-size: 0.8rem;
  color: #fff;
}
.track-card h3 { font-size: 1.06rem; }
.track-card .tagline { font-size: 0.74rem; color: var(--text-faint); }
.track-card .blurb { font-size: 0.845rem; color: var(--text-dim); flex: 1; }
.track-meta { display: flex; justify-content: space-between; font-size: 0.74rem; color: var(--text-faint); font-family: var(--font-mono); }

/* radar */

.radar-wrap { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; }
.radar-legend { display: flex; flex-direction: column; gap: 5px; font-size: 0.76rem; flex: 1; min-width: 150px; }
.radar-legend-row { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.radar-legend-row .n { font-family: var(--font-mono); color: var(--text-dim); }

/* heatmap */

.heatmap { display: grid; grid-auto-flow: column; grid-template-rows: repeat(7, 11px); gap: 3px; overflow-x: auto; padding-bottom: 4px; }
.heat-cell { width: 11px; height: 11px; border-radius: 2px; background: var(--bg-raised); }
.heat-cell[data-level='1'] { background: rgba(201, 144, 58, 0.32); }
.heat-cell[data-level='2'] { background: rgba(201, 144, 58, 0.55); }
.heat-cell[data-level='3'] { background: rgba(201, 144, 58, 0.78); }
.heat-cell[data-level='4'] { background: var(--gold-soft); }
.heat-legend { display: flex; align-items: center; gap: 6px; font-size: 0.7rem; color: var(--text-faint); margin-top: 10px; justify-content: flex-end; }

/* ---------------------------------------------------------------- track view */

.tier {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-panel);
  margin-bottom: 16px;
  overflow: hidden;
}

.tier-head {
  display: flex; align-items: center; gap: 14px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-panel-2);
}
.tier-index {
  width: 30px; height: 30px; border-radius: 8px;
  display: grid; place-items: center;
  background: var(--bg-raised); color: var(--text-dim);
  font-family: var(--font-mono); font-size: 0.78rem; font-weight: 700;
  flex-shrink: 0;
}
.tier-head h3 { font-size: 0.98rem; }
.tier-head p { font-size: 0.79rem; color: var(--text-faint); }
.tier-progress { margin-left: auto; font-size: 0.76rem; font-family: var(--font-mono); color: var(--text-dim); white-space: nowrap; }

.difficulty-section { }
.difficulty-label {
  padding: 8px 20px;
  font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em;
  color: var(--text-faint);
  border-bottom: 1px solid var(--border);
}
.difficulty-label[data-level="beginner"]     { color: var(--green); }
.difficulty-label[data-level="intermediate"] { color: #eab308; }
.difficulty-label[data-level="advanced"]     { color: #f97316; }

.challenge-row {
  display: flex; align-items: center; gap: 14px;
  padding: 13px 20px;
  border-bottom: 1px solid var(--border);
  transition: background var(--ease) 140ms;
}
.challenge-row:last-child { border-bottom: none; }
.challenge-row:hover { background: var(--bg-panel-2); }

.challenge-status {
  width: 26px; height: 26px; border-radius: 50%;
  display: grid; place-items: center; flex-shrink: 0;
  border: 2px solid var(--border-strong);
  font-size: 0.7rem; font-weight: 700;
}
.challenge-status.done { background: var(--green); border-color: var(--green); color: #04140a; }
.challenge-status.partial { border-color: var(--amber); color: var(--amber); }

.challenge-main { flex: 1; min-width: 0; }
.challenge-main .t { font-weight: 600; font-size: 0.9rem; }
.challenge-main .m { font-size: 0.75rem; color: var(--text-faint); display: flex; gap: 10px; flex-wrap: wrap; margin-top: 2px; }

.diff-dots { display: inline-flex; gap: 2px; align-items: center; }
.diff-dot { width: 5px; height: 5px; border-radius: 50%; background: var(--border-strong); }
.diff-dot.on { background: var(--d, var(--amber)); }

.score-badge {
  font-family: var(--font-mono); font-size: 0.78rem; font-weight: 700;
  padding: 3px 9px; border-radius: var(--radius-full);
  border: 1px solid currentColor;
  flex-shrink: 0;
}

/* ---------------------------------------------------------------- challenge */

.workspace {
  display: grid;
  grid-template-columns: minmax(300px, 27%) 1fr minmax(300px, 30%);
  height: calc(100vh - var(--topbar-h));
  overflow: hidden;
}

.pane { display: flex; flex-direction: column; min-width: 0; overflow: hidden; border-right: 1px solid var(--border); }
.pane:last-child { border-right: none; }

.pane-head {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-panel);
  min-height: 44px;
  flex-shrink: 0;
}
.pane-head h2 { font-size: 0.86rem; font-weight: 600; }
.pane-head .spacer { margin-left: auto; }

.pane-body { flex: 1; overflow-y: auto; min-height: 0; }
.pane-body.pad { padding: 18px; }

/* brief */

.brief h1 { font-size: 1.22rem; margin-bottom: 10px; }
.brief-meta { display: flex; flex-wrap: wrap; gap: 7px; margin-bottom: 18px; }
.brief-body { font-size: 0.885rem; color: var(--text-dim); }
.brief-body p { margin-bottom: 11px; }
.brief-body ul { margin: 0 0 12px; padding-left: 20px; }
.brief-body li { margin-bottom: 5px; }
.brief-body code {
  background: var(--bg-raised); padding: 1.5px 5px; border-radius: 4px;
  font-size: 0.85em; color: var(--gold-soft);
}
.brief-body pre {
  background: var(--bg-input); border: 1px solid var(--border);
  padding: 12px 14px; border-radius: var(--radius-sm);
  overflow-x: auto; font-size: 0.8rem; margin: 0 0 12px;
}
.brief-body pre code { background: none; padding: 0; color: var(--text); }
.brief-body strong { color: var(--text); font-weight: 600; }

.section-label {
  font-size: 0.68rem; font-weight: 700; letter-spacing: 0.11em;
  text-transform: uppercase; color: var(--text-faint);
  margin: 22px 0 10px;
  display: flex; align-items: center; gap: 8px;
}
.section-label::after { content: ''; flex: 1; height: 1px; background: var(--border); }

.requirement { display: flex; gap: 9px; align-items: flex-start; font-size: 0.81rem; padding: 5px 0; color: var(--text-dim); }
.requirement .mark { flex-shrink: 0; width: 15px; font-family: var(--font-mono); font-size: 0.78rem; }

.hint-box {
  background: var(--bg-panel-2); border: 1px solid var(--border);
  border-left: 3px solid var(--gold);
  padding: 11px 14px; border-radius: var(--radius-sm);
  font-size: 0.82rem; color: var(--text-dim); margin-bottom: 9px;
}

/* editor */

.editor-host { flex: 1; min-height: 0; position: relative; }
.editor-host .monaco-editor { position: absolute; inset: 0; }

.fallback-editor {
  width: 100%; height: 100%;
  background: var(--bg-input); color: var(--text);
  border: none; padding: 14px 16px;
  font-family: var(--font-mono); font-size: 13.5px; line-height: 1.6;
  resize: none; outline: none; tab-size: 4;
}

.tabs { display: flex; gap: 2px; }
.tab {
  padding: 5px 13px; border-radius: 6px;
  font-size: 0.78rem; font-weight: 600; color: var(--text-faint);
  transition: background var(--ease) 140ms, color var(--ease) 140ms;
}
.tab:hover { color: var(--text-dim); background: var(--bg-panel-2); }
.tab.active { background: var(--bg-raised); color: var(--text); }

.run-bar {
  display: flex; align-items: center; gap: 10px;
  padding: 11px 16px;
  border-top: 1px solid var(--border);
  background: var(--bg-panel);
  flex-shrink: 0;
}
.run-status { font-size: 0.77rem; color: var(--text-faint); flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.spinner {
  width: 13px; height: 13px; border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.2); border-top-color: currentColor;
  animation: spin 700ms linear infinite; display: inline-block;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* results */

.preview-frame { width: 100%; flex: 1; border: none; background: #fff; min-height: 220px; }

.result-row {
  display: flex; align-items: flex-start; gap: 10px;
  padding: 9px 14px;
  border-bottom: 1px solid var(--border);
  font-size: 0.815rem;
}
.result-row:last-child { border-bottom: none; }
.result-mark { flex-shrink: 0; font-family: var(--font-mono); font-weight: 700; font-size: 0.76rem; margin-top: 1px; }
.result-mark.pass { color: var(--green); }
.result-mark.fail { color: var(--red); }
.result-body { flex: 1; min-width: 0; }
.result-name { color: var(--text); }
.result-diff { font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-faint); margin-top: 3px; word-break: break-word; }
.result-diff .got { color: var(--red); }
.result-diff .want { color: var(--green); }

.console-out {
  font-family: var(--font-mono); font-size: 0.75rem;
  background: var(--bg-input); border-top: 1px solid var(--border);
  padding: 12px 14px; color: var(--text-dim);
  white-space: pre-wrap; word-break: break-word;
  max-height: 220px; overflow-y: auto;
}
.console-out.error { color: var(--red); }

/* scorecard */

.scorecard { padding: 18px; }

.score-hero { display: flex; align-items: center; gap: 18px; margin-bottom: 20px; }
.score-ring { position: relative; width: 84px; height: 84px; flex-shrink: 0; }
.score-ring svg { transform: rotate(-90deg); }
.score-ring .num {
  position: absolute; inset: 0; display: grid; place-items: center;
  font-family: var(--font-mono); font-size: 1.4rem; font-weight: 700;
}
.score-hero .grade-letter { font-family: var(--font-head); font-size: 2rem; font-weight: 700; line-height: 1; }
.score-hero .grade-label { font-size: 0.8rem; color: var(--text-dim); }
.score-hero .xp-gain { font-size: 0.78rem; color: var(--gold); font-weight: 600; margin-top: 5px; }

.dim-row { margin-bottom: 14px; }
.dim-head { display: flex; align-items: baseline; justify-content: space-between; font-size: 0.8rem; margin-bottom: 5px; }
.dim-head .name { font-weight: 600; }
.dim-head .w { color: var(--text-faint); font-size: 0.71rem; margin-left: 6px; font-weight: 500; }
.dim-head .v { font-family: var(--font-mono); font-weight: 600; }
.dim-track { height: 5px; border-radius: 99px; background: var(--bg-raised); overflow: hidden; }
.dim-fill { height: 100%; border-radius: 99px; transition: width 600ms var(--ease); }

.dim-detail { font-size: 0.74rem; color: var(--text-faint); margin-top: 5px; display: flex; flex-direction: column; gap: 2px; }
.dim-detail .ok { color: var(--text-faint); }
.dim-detail .no { color: var(--orange); }

.feedback-item {
  display: flex; gap: 9px; align-items: flex-start;
  font-size: 0.815rem; padding: 8px 11px;
  border-radius: var(--radius-sm); margin-bottom: 6px;
  background: var(--bg-panel-2);
}
.feedback-item .icon { flex-shrink: 0; font-family: var(--font-mono); font-weight: 700; font-size: 0.72rem; margin-top: 2px; }
.feedback-item.good { color: var(--text-dim); } .feedback-item.good .icon { color: var(--green); }
.feedback-item.warn { color: var(--text-dim); } .feedback-item.warn .icon { color: var(--amber); }
.feedback-item.bad  { color: var(--text-dim); } .feedback-item.bad .icon { color: var(--red); }

/* ---------------------------------------------------------------- assessment */

.exam-card {
  background: var(--bg-panel); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px;
  display: flex; flex-direction: column; gap: 12px;
  transition: transform var(--ease) 180ms, border-color var(--ease) 180ms;
}
.exam-card:hover { transform: translateY(-2px); border-color: var(--border-strong); }
.exam-card h3 { font-size: 1.02rem; }
.exam-card .blurb { font-size: 0.845rem; color: var(--text-dim); flex: 1; }
.exam-meta { display: flex; gap: 8px; flex-wrap: wrap; }

.exam-timer {
  font-family: var(--font-mono); font-size: 0.95rem; font-weight: 700;
  padding: 5px 12px; border-radius: var(--radius-full);
  background: var(--bg-raised); border: 1px solid var(--border-strong);
}
.exam-timer.warning { color: var(--amber); border-color: var(--amber); }
.exam-timer.danger { color: var(--red); border-color: var(--red); animation: pulse 1.1s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: 0.55; } }

.exam-nav { display: flex; gap: 6px; }
.exam-nav-item {
  width: 30px; height: 30px; border-radius: 7px;
  display: grid; place-items: center;
  font-family: var(--font-mono); font-size: 0.76rem; font-weight: 700;
  background: var(--bg-raised); color: var(--text-faint);
  border: 1px solid transparent;
}
.exam-nav-item:hover { color: var(--text); }
.exam-nav-item.active { border-color: var(--gold); color: var(--text); }
.exam-nav-item.answered { background: rgba(34, 197, 94, 0.16); color: var(--green); }

.report-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }

/* The exam adds its own bar above the workspace, so the panes lose that height. */
.exam-shell > .pane-head { border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 30; }
.exam-shell .workspace { height: calc(100vh - var(--topbar-h) - 53px); }
@media (max-width: 900px) { .exam-shell .workspace { height: auto; } }

/* ---------------------------------------------------------------- lessons */

.lesson-wrap { max-width: 780px; margin: 0 auto; }

.lesson-head { margin-bottom: 30px; padding-bottom: 24px; border-bottom: 1px solid var(--border); }
.lesson-head h1 { font-size: 2rem; margin: 6px 0 10px; }
.lesson-summary { color: var(--text-dim); font-size: 1rem; }
.lesson-meta { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 14px; }

.objectives {
  margin-top: 20px; padding: 14px 18px;
  background: var(--bg-panel); border: 1px solid var(--border);
  border-radius: var(--radius); font-size: 0.86rem;
}
.objectives strong { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.07em; color: var(--text-faint); }
.objectives ul { margin: 8px 0 0; padding-left: 20px; color: var(--text-dim); }
.objectives li { margin-bottom: 4px; }

/* prose */

.lesson-prose { font-size: 1rem; line-height: 1.72; color: var(--text-dim); }
.lesson-prose p { margin-bottom: 15px; }
.lesson-prose h3 { font-size: 1.28rem; color: var(--text); margin: 34px 0 12px; }
.lesson-prose h4 { font-size: 1.06rem; color: var(--text); margin: 26px 0 10px; }
.lesson-prose strong { color: var(--text); font-weight: 600; }
.lesson-prose ul, .lesson-prose ol { margin: 0 0 16px; padding-left: 24px; }
.lesson-prose li { margin-bottom: 7px; }
.lesson-prose a { color: var(--blue-soft); text-decoration: underline; text-underline-offset: 2px; }
.lesson-prose code {
  background: var(--bg-raised); padding: 2px 6px; border-radius: 5px;
  font-size: 0.86em; color: var(--gold-soft);
}
.lesson-prose pre {
  background: var(--bg-input); border: 1px solid var(--border);
  padding: 14px 16px; border-radius: var(--radius-sm);
  overflow-x: auto; font-size: 0.82rem; margin: 0 0 16px; line-height: 1.6;
}
.lesson-prose pre code { background: none; padding: 0; color: var(--text); font-size: 1em; }

/* tables */

.table-scroll { overflow-x: auto; margin: 0 0 18px; }
.table-scroll table { border-collapse: collapse; width: 100%; font-size: 0.87rem; }
.table-scroll th, .table-scroll td {
  text-align: left; padding: 8px 12px; border-bottom: 1px solid var(--border);
}
.table-scroll th {
  color: var(--text); font-weight: 600; font-size: 0.76rem;
  text-transform: uppercase; letter-spacing: 0.06em;
  border-bottom-color: var(--border-strong);
}
.table-scroll td { color: var(--text-dim); }
.table-scroll code { white-space: nowrap; }

/* callouts */

.callout {
  border-radius: var(--radius); padding: 14px 18px; margin: 0 0 20px;
  border: 1px solid var(--border); border-left-width: 3px;
  background: var(--bg-panel); font-size: 0.92rem; line-height: 1.65; color: var(--text-dim);
}
.callout strong:first-child { display: block; color: var(--text); margin-bottom: 6px; font-size: 0.88rem; }
.callout p:last-child { margin-bottom: 0; }
.callout p { margin-bottom: 10px; }
.callout code { background: var(--bg-raised); padding: 2px 5px; border-radius: 4px; font-size: 0.86em; color: var(--gold-soft); }
.callout pre { background: var(--bg-input); border: 1px solid var(--border); padding: 12px 14px; border-radius: var(--radius-sm); overflow-x: auto; font-size: 0.8rem; }
.callout ul { margin: 0 0 10px; padding-left: 20px; }

.callout.tip { border-left-color: var(--blue-soft); }
.callout.warn { border-left-color: var(--orange); }
.callout.why { border-left-color: var(--gold); }
.callout.analogy { border-left-color: var(--purple); }

/* runnable code */

.code-run, .web-run {
  border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; margin: 0 0 20px; background: var(--bg-panel);
}
.code-run-head {
  display: flex; align-items: center; gap: 10px;
  padding: 7px 12px; background: var(--bg-panel-2); border-bottom: 1px solid var(--border);
}
.code-run-head .spacer { margin-left: auto; }
.code-lang {
  font-family: var(--font-mono); font-size: 0.7rem; color: var(--text-faint);
  text-transform: lowercase; letter-spacing: 0.04em;
}

.code-area {
  display: block; width: 100%; border: none; resize: vertical;
  background: var(--bg-input); color: var(--text);
  font-family: var(--font-mono); font-size: 0.82rem; line-height: 1.65;
  padding: 14px 16px; outline: none; tab-size: 4;
}
.code-area:focus { box-shadow: inset 0 0 0 2px rgba(74, 159, 214, 0.35); }

.code-out {
  margin: 0; padding: 12px 16px; border-top: 1px solid var(--border);
  background: var(--bg-panel-2); color: var(--text-dim);
  font-family: var(--font-mono); font-size: 0.78rem; line-height: 1.6;
  white-space: pre-wrap; word-break: break-word; max-height: 260px; overflow-y: auto;
}
.code-out.error { color: var(--red); }

.code-static {
  background: var(--bg-input); border: 1px solid var(--border);
  padding: 14px 16px; border-radius: var(--radius-sm);
  overflow-x: auto; font-size: 0.82rem; margin: 0 0 20px; line-height: 1.6;
}

.lesson-preview {
  width: 100%; height: 260px; border: none; border-top: 1px solid var(--border);
  background: #fff; display: block;
}

/* case study */

.case-study {
  border: 1px solid var(--border-strong); border-radius: var(--radius-lg);
  padding: 22px; margin: 0 0 24px;
  background: linear-gradient(180deg, rgba(201, 144, 58, 0.05), transparent 40%), var(--bg-panel);
}
.case-label {
  font-size: 0.66rem; font-weight: 700; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--gold); margin-bottom: 6px;
}
.case-study h3 { font-size: 1.2rem; margin-bottom: 12px; }

/* exercises */

.exercise {
  border: 1px solid var(--border-strong); border-radius: var(--radius-lg);
  padding: 20px; margin: 0 0 24px; background: var(--bg-panel);
  border-left: 3px solid var(--blue);
}
.exercise.solved { border-left-color: var(--green); }

.exercise.debug   { border-left-color: var(--orange); }
.exercise.complete { border-left-color: #8b5cf6; }
.exercise.refactor { border-left-color: #06b6d4; }

.exercise.debug .exercise-badge   { color: var(--orange); }
.exercise.complete .exercise-badge { color: #8b5cf6; }
.exercise.refactor .exercise-badge { color: #06b6d4; }

.exercise-head { display: flex; align-items: center; gap: 8px; margin-bottom: 12px; flex-wrap: wrap; }
.exercise-head .spacer { margin-left: auto; }
.exercise-badge {
  font-size: 0.66rem; font-weight: 700; letter-spacing: 0.11em;
  text-transform: uppercase; color: var(--blue-soft);
}
.exercise.solved .exercise-badge { color: var(--green); }

.exercise-editor {
  height: 240px; border: 1px solid var(--border); border-radius: var(--radius-sm);
  overflow: hidden; margin-top: 12px; position: relative;
}
.exercise-editor .fallback-editor { font-size: 13px; }

.exercise .lesson-preview { border: 1px solid var(--border); border-radius: var(--radius-sm); margin-top: 10px; height: 220px; }

.exercise-result { margin-top: 12px; font-size: 0.86rem; }
.exercise-result:empty { display: none; }
.exercise-result.running { color: var(--text-faint); }
.exercise-result.pass { color: var(--green); }
.exercise-result.fail { color: var(--orange); }
.exercise-result ul { margin: 8px 0 0; padding-left: 20px; color: var(--text-dim); }
.exercise-result li { margin-bottom: 4px; }
.exercise-result code { background: var(--bg-raised); padding: 1px 5px; border-radius: 4px; font-size: 0.85em; }
.exercise-result pre { margin-top: 10px; border-radius: var(--radius-sm); border: 1px solid var(--border); }

.hint-zone:not(:empty) { margin: 12px 0 0; }
.hint-zone .callout { margin-bottom: 8px; font-size: 0.86rem; }

/* quiz */

.quiz {
  border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 20px; margin: 0 0 24px; background: var(--bg-panel-2);
}
.quiz-label {
  font-size: 0.66rem; font-weight: 700; letter-spacing: 0.11em;
  text-transform: uppercase; color: var(--text-faint); margin-bottom: 8px;
}
.quiz.answered .quiz-label { color: var(--green); }
.quiz-q { font-size: 0.98rem; font-weight: 600; margin-bottom: 14px; color: var(--text); }
.quiz-options { display: flex; flex-direction: column; gap: 7px; }

.quiz-option {
  text-align: left; padding: 11px 14px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); background: var(--bg-panel);
  font-size: 0.88rem; color: var(--text-dim); transition: all var(--ease) 140ms;
}
.quiz-option:hover:not(:disabled) { border-color: var(--text-faint); color: var(--text); }
.quiz-option:disabled { cursor: default; }
.quiz-option.correct { border-color: var(--green); background: rgba(34, 197, 94, 0.1); color: var(--text); }
.quiz-option.wrong { border-color: var(--red); background: rgba(239, 68, 68, 0.1); color: var(--text); }

.quiz-why {
  margin-top: 12px; padding: 11px 14px; border-radius: var(--radius-sm);
  background: var(--bg-raised); font-size: 0.85rem; color: var(--text-dim); line-height: 1.6;
}

/* lesson footer */

.lesson-foot { margin-top: 36px; padding-top: 22px; border-top: 1px solid var(--border); }
.lesson-progress-note { font-size: 0.84rem; color: var(--text-faint); margin-bottom: 14px; }
.lesson-nav { display: flex; gap: 10px; align-items: center; justify-content: space-between; flex-wrap: wrap; }
.lesson-nav .btn { max-width: 15rem; overflow: hidden; text-overflow: ellipsis; }

@media (max-width: 760px) {
  .lesson-head h1 { font-size: 1.55rem; }
  .lesson-nav { flex-direction: column; align-items: stretch; }
  .lesson-nav .btn { max-width: none; }
  .exercise, .quiz, .case-study { padding: 15px; }
}

/* ---------------------------------------------------------------- modal */

.modal-backdrop {
  position: fixed; inset: 0; z-index: 100;
  background: rgba(4, 6, 10, 0.72);
  backdrop-filter: blur(5px);
  display: grid; place-items: center;
  padding: 22px;
  animation: fade 180ms var(--ease);
}
@keyframes fade { from { opacity: 0; } }

.modal {
  background: var(--bg-panel);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  max-width: 620px; width: 100%;
  max-height: 84vh; overflow-y: auto;
  padding: 26px;
  animation: rise 220ms var(--ease);
}
@keyframes rise { from { opacity: 0; transform: translateY(14px); } }

.modal h2 { font-size: 1.2rem; margin-bottom: 10px; }
.modal-actions { display: flex; gap: 10px; justify-content: flex-end; margin-top: 22px; }

/* ---------------------------------------------------- forms & onboarding */

.field-label {
  display: block; font-size: 0.72rem; font-weight: 700;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--text-faint); margin-bottom: 6px;
}

.field-input {
  width: 100%; padding: 10px 13px;
  border-radius: var(--radius-sm); border: 1px solid var(--border);
  background: var(--bg-input); color: var(--text);
  font-size: 0.92rem; font-family: var(--font-sans); outline: none;
  transition: border-color var(--ease) 140ms;
}
.field-input:focus { border-color: var(--blue-soft); }

.field-error { font-size: 0.78rem; color: var(--orange); min-height: 1.1rem; margin-top: 5px; }

.course-picker { display: flex; flex-direction: column; gap: 8px; }

.course-pick {
  display: flex; align-items: center; gap: 12px; text-align: left;
  padding: 11px 13px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); background: var(--bg-panel-2);
  transition: border-color var(--ease) 140ms, background var(--ease) 140ms;
}
.course-pick:hover { border-color: var(--border-strong); }
.course-pick.picked { border-color: var(--accent, var(--gold)); background: var(--bg-raised); }

.course-pick-text { flex: 1; min-width: 0; }
.course-pick-text strong { display: block; font-size: 0.88rem; }
.course-pick-text small { display: block; font-size: 0.76rem; color: var(--text-faint); line-height: 1.45; margin-top: 2px; }

.course-tick { opacity: 0; color: var(--accent, var(--gold)); font-weight: 700; flex-shrink: 0; }
.course-pick.picked .course-tick { opacity: 1; }

/* --------------------------------------------------------- hall of fame */

.board-table { width: 100%; border-collapse: collapse; font-size: 0.87rem; }
.board-table th {
  text-align: left; padding: 10px 14px;
  font-size: 0.68rem; font-weight: 700; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--text-faint);
  border-bottom: 1px solid var(--border-strong);
  background: var(--bg-panel-2);
  white-space: nowrap;
}
.board-table td { padding: 11px 14px; border-bottom: 1px solid var(--border); vertical-align: middle; }
.board-table tr:last-child td { border-bottom: none; }
.board-table tr.is-me { background: rgba(201, 144, 58, 0.08); }
.board-table tr.is-me td { border-bottom-color: rgba(201, 144, 58, 0.2); }

.board-table .rank { font-family: var(--font-mono); font-size: 0.95rem; color: var(--text-faint); text-align: center; }

.athlete { display: flex; align-items: center; gap: 7px; }
.athlete-name { font-weight: 600; color: var(--text); }
.athlete-handle { font-size: 0.72rem; color: var(--text-faint); font-family: var(--font-mono); margin-top: 1px; }

.mini-glyphs { display: flex; gap: 4px; }
.mini-glyph {
  width: 20px; height: 20px; border-radius: 5px;
  display: grid; place-items: center;
  font-family: var(--font-mono); font-size: 0.55rem; font-weight: 700; color: #fff;
}

/* toast */

.toast-stack { position: fixed; right: 20px; bottom: 20px; z-index: 200; display: flex; flex-direction: column; gap: 9px; }
.toast {
  background: var(--bg-raised); border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm); padding: 11px 15px;
  font-size: 0.83rem; box-shadow: var(--shadow-md);
  animation: slide 220ms var(--ease); max-width: 330px;
}
.toast.good { border-left: 3px solid var(--green); }
.toast.bad { border-left: 3px solid var(--red); }
.toast.info { border-left: 3px solid var(--blue-soft); }
@keyframes slide { from { opacity: 0; transform: translateX(22px); } }

/* ---------------------------------------------------------------- responsive */

.mobile-toggle { display: none; }

@media (max-width: 1180px) {
  .workspace { grid-template-columns: minmax(260px, 32%) 1fr; grid-template-rows: 1fr 46vh; }
  .pane.results-pane { grid-column: 1 / -1; border-right: none; border-top: 1px solid var(--border); }
}

@media (max-width: 900px) {
  .app { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed; z-index: 90; left: 0; top: 0; width: 250px;
    transform: translateX(-100%); transition: transform 240ms var(--ease);
    box-shadow: var(--shadow-lg);
  }
  .sidebar.open { transform: none; }
  .mobile-toggle { display: grid; }
  .view { padding: 22px 18px 56px; }
  .workspace { grid-template-columns: 1fr; grid-template-rows: auto 60vh auto; height: auto; overflow: visible; }
  .pane { border-right: none; border-bottom: 1px solid var(--border); }
  .pane-body { overflow-y: visible; }
  .pane.brief-pane .pane-body { max-height: 44vh; overflow-y: auto; }
  .hero { padding: 24px 20px; }
  .hero h1 { font-size: 1.5rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* ============================================================== COACH PANEL */

.coach-panel {
  position: fixed; bottom: 24px; right: 24px;
  width: 340px; max-width: calc(100vw - 32px);
  background: var(--bg-panel); border: 1px solid var(--border-strong);
  border-radius: 16px; box-shadow: 0 16px 48px rgba(0,0,0,0.3);
  z-index: 1000; overflow: hidden;
}
.coach-panel.coach-enter { animation: coach-slide-in 300ms ease; }
.coach-panel.coach-exit  { animation: coach-slide-out 250ms ease forwards; }

.coach-close {
  position: absolute; top: 8px; right: 12px;
  background: none; border: none;
  font-size: 1.2rem; color: var(--text-faint); cursor: pointer;
  padding: 4px 8px; border-radius: 6px;
}
.coach-close:hover { background: var(--bg-raised); color: var(--text); }

.coach-header {
  display: flex; align-items: center; gap: 12px;
  padding: 18px 18px 12px;
  border-bottom: 1px solid var(--border);
}
.coach-avatar {
  width: 48px; height: 48px; border-radius: 50%;
  background: var(--coach-color, var(--blue));
  flex-shrink: 0; overflow: hidden;
  display: grid; place-items: center;
}
.coach-avatar svg { width: 40px; height: 40px; }
.coach-name {
  font-size: 0.9rem; font-weight: 700; color: var(--text);
}
.coach-tone {
  font-size: 0.76rem; color: var(--text-dim); font-style: italic;
  margin-top: 2px; line-height: 1.35;
}
.coach-body { padding: 14px 18px 18px; }
.coach-quote {
  font-size: 0.91rem; line-height: 1.55; color: var(--text);
  font-style: italic;
}
.coach-quote-mark { color: var(--coach-color, var(--blue)); font-weight: 700; }
.coach-source {
  font-size: 0.72rem; color: var(--text-faint);
  margin-top: 10px; font-weight: 600; letter-spacing: 0.03em;
}

@keyframes coach-slide-in {
  from { opacity: 0; transform: translateY(24px) scale(0.96); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes coach-slide-out {
  from { opacity: 1; transform: translateY(0) scale(1); }
  to   { opacity: 0; transform: translateY(16px) scale(0.97); }
}

/* ==================================================== CELEBRATION ANIMATIONS */

@media (prefers-reduced-motion: no-preference) {
  .xp-pulse {
    animation: xp-pulse 600ms ease;
  }
  @keyframes xp-pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(var(--gold-rgb), 0.4); }
    50%      { box-shadow: 0 0 0 8px rgba(var(--gold-rgb), 0); }
  }

  .sparkle {
    position: fixed; pointer-events: none; z-index: 1001;
    width: 6px; height: 6px; border-radius: 50%; background: var(--gold);
    animation: sparkle-fly 700ms ease-out forwards;
  }
  @keyframes sparkle-fly {
    0%   { opacity: 1; transform: translate(0, 0) scale(1); }
    100% { opacity: 0; transform: translate(var(--sx), var(--sy)) scale(0); }
  }

  .ring-expand {
    position: absolute; inset: -4px; border-radius: 50%;
    border: 2px solid var(--green);
    animation: ring-expand 600ms ease-out forwards;
    pointer-events: none;
  }
  @keyframes ring-expand {
    0%   { opacity: 1; transform: scale(1); }
    100% { opacity: 0; transform: scale(1.6); }
  }

  .banner-slide {
    position: fixed; top: 0; left: 0; right: 0; z-index: 999;
    background: var(--gold); color: #111;
    text-align: center; padding: 10px 16px;
    font-size: 0.82rem; font-weight: 700; letter-spacing: 0.04em;
    animation: banner-slide-in 400ms ease, banner-slide-out 300ms ease 2.5s forwards;
  }
  @keyframes banner-slide-in  { from { transform: translateY(-100%); } to { transform: translateY(0); } }
  @keyframes banner-slide-out { from { transform: translateY(0); }  to { transform: translateY(-100%); } }
}

/* ================================================================ ROADMAP */

.roadmap-wrap {
  padding: 8px 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.roadmap-wrap svg {
  display: block;
  min-width: 800px;
  width: 100%;
}
.roadmap-wrap .station-dot {
  transition: r 200ms ease, fill 200ms ease;
}
.roadmap-wrap .station-dot:hover {
  r: 9;
}
.roadmap-wrap .station-label {
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 10px;
}
.roadmap-wrap .station-sublabel {
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 8px;
}

/* ============================================================
   MOBILE & SMALL-SCREEN FIXES
   ============================================================ */

/* --- iOS Safari dvh fallback --- */
@supports (height: 100dvh) {
  .sidebar { height: 100dvh; }
  .workspace { height: calc(100dvh - var(--topbar-h)); }
  .exam-shell .workspace { height: calc(100dvh - var(--topbar-h) - 53px); }
}

/* --- Sidebar backdrop overlay on mobile --- */
@media (max-width: 900px) {
  .sidebar::before {
    content: '';
    position: fixed;
    inset: 0;
    background: rgba(4, 6, 10, 0.65);
    z-index: -1;
    opacity: 0;
    pointer-events: none;
    transition: opacity 240ms ease;
  }
  .sidebar.open::before {
    opacity: 1;
    pointer-events: auto;
  }

  .workspace {
    grid-template-rows: minmax(180px, 32vh) minmax(280px, 52vh) auto;
  }
  .pane.brief-pane .pane-body { max-height: none; }
  .run-bar { flex-wrap: wrap; gap: 8px; }
  .run-status { flex: auto; }

  .topbar {
    gap: 8px;
    padding: 0 12px;
    flex-wrap: wrap;
    height: auto;
    min-height: var(--topbar-h);
    padding-top: 6px;
    padding-bottom: 6px;
  }
  .topbar-spacer { display: none; }
}

/* --- Landscape workspace on phones --- */
@media (max-width: 900px) and (orientation: landscape) {
  .workspace {
    grid-template-columns: minmax(200px, 30%) 1fr;
    grid-template-rows: 1fr;
    height: calc(100dvh - var(--topbar-h));
  }
  .pane.results-pane {
    grid-column: auto;
    border-top: none;
    border-left: 1px solid var(--border);
  }
}

/* --- Very small phones (<480px) --- */
@media (max-width: 480px) {
  .view { padding: 16px 12px 48px; }
  .page-head h1 { font-size: 1.35rem; }
  .page-head p { font-size: 0.84rem; }

  .topbar { gap: 6px; padding: 0 10px; overflow-x: auto; }
  .topbar-title { font-size: 0.84rem; white-space: nowrap; }
  .stat-chip { font-size: 0.68rem; padding: 3px 8px; gap: 4px; }

  .hero { padding: 18px 14px; border-radius: var(--radius); }
  .hero h1 { font-size: 1.25rem; }
  .hero p { font-size: 0.82rem; }
  .hero-stats { gap: 16px; }
  .hero-stat .n { font-size: 1.3rem; }

  .modal { padding: 16px; max-height: 90vh; }
  .modal h2 { font-size: 1.05rem; }
  .modal-actions { flex-direction: column; }
  .modal-actions .btn { width: 100%; }

  .coach-panel { width: auto; left: 12px; right: 12px; bottom: 10px; max-width: none; }
  .toast-stack { right: 8px; bottom: 10px; left: 8px; }
  .toast { max-width: none; }

  .icon-btn { width: 40px; height: 40px; }
  .exam-nav-item { width: 36px; height: 36px; font-size: 0.78rem; }
  .track-card-head { flex-wrap: wrap; }

  .brush-brief-pane .brush-brief-body { max-height: none; }
}

/* --- Exercise editor responsive height --- */
@media (max-width: 760px) {
  .exercise-editor { height: clamp(180px, 40vh, 240px); }
  .exercise .lesson-preview { height: clamp(160px, 32vh, 220px); }
  .lesson-wrap .lesson-prose { font-size: 0.92rem; }
}

/* --- Roadmap SVG scaling --- */
@media (max-width: 900px) {
  .roadmap-wrap svg { min-width: 600px; }
}
@media (max-width: 640px) {
  .roadmap-wrap svg { min-width: 440px; }
}

/* --- Board table scroll wrapper --- */
.board-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 0 -12px;
  padding: 0 12px;
}

/* --- Hover-only for touch devices --- */
@media (hover: hover) {
  .track-card:hover { transform: translateY(-3px); border-color: var(--border-strong); box-shadow: var(--shadow-md); }
  .exam-card:hover { transform: translateY(-2px); border-color: var(--border-strong); }
}