/* ============================================
   CS MULTIVERSE — Global Design System
   ============================================ */

:root {
  /* Base cosmic palette */
  --bg-void: #050410;
  --bg-deep: #0a0820;
  --bg-elevated: #14122c;
  --bg-glass: rgba(255, 255, 255, 0.04);
  --bg-glass-strong: rgba(255, 255, 255, 0.08);

  --ink-100: #f6f5ff;
  --ink-200: #d8d6f0;
  --ink-300: #a3a0c8;
  --ink-400: #6f6c95;
  --ink-500: #4a4775;
  --ink-line: rgba(255, 255, 255, 0.08);
  --ink-line-strong: rgba(255, 255, 255, 0.16);

  /* Iridescent platform accent */
  --iris-1: oklch(75% 0.18 300);
  --iris-2: oklch(78% 0.16 220);
  --iris-3: oklch(80% 0.16 160);
  --iris-warm: oklch(82% 0.16 60);

  /* Default active world (overridden per world via data-world) */
  --w-h: 300;
  --w-c: 0.2;
  --w-primary: oklch(75% var(--w-c) var(--w-h));
  --w-bright: oklch(85% var(--w-c) var(--w-h));
  --w-deep: oklch(40% 0.16 var(--w-h));
  --w-glow: oklch(75% var(--w-c) var(--w-h) / 0.35);
  --w-tint: oklch(75% var(--w-c) var(--w-h) / 0.12);

  /* Type */
  --font-display: "Space Grotesk", "Inter", system-ui, sans-serif;
  --font-body: "Inter", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;

  /* Density */
  --d: 1;          /* density multiplier — 1 cinematic, 0.7 compact */
  --space-1: calc(4px * var(--d));
  --space-2: calc(8px * var(--d));
  --space-3: calc(12px * var(--d));
  --space-4: calc(16px * var(--d));
  --space-5: calc(20px * var(--d));
  --space-6: calc(24px * var(--d));
  --space-8: calc(32px * var(--d));
  --space-10: calc(40px * var(--d));
  --space-12: calc(48px * var(--d));
  --space-16: calc(64px * var(--d));

  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 22px;
  --r-xl: 32px;
  --r-full: 999px;

  /* Theme presets — arcade & glass override these */
  --shell-bg: radial-gradient(ellipse 80% 60% at 20% -10%, oklch(35% 0.15 280 / 0.4), transparent 60%),
              radial-gradient(ellipse 60% 50% at 100% 100%, oklch(40% 0.18 200 / 0.3), transparent 60%),
              radial-gradient(ellipse 50% 40% at 50% 50%, oklch(30% 0.12 320 / 0.2), transparent 70%),
              var(--bg-void);
}

[data-theme="arcade"] {
  --bg-void: #0d0d10;
  --bg-deep: #16161c;
  --bg-elevated: #1f1f28;
  --shell-bg:
    linear-gradient(180deg, #0d0d10 0%, #0a0a0c 100%);
  --iris-1: oklch(72% 0.22 30);
}

[data-theme="glass"] {
  --bg-void: #1a1830;
  --bg-deep: #221f3c;
  --bg-elevated: rgba(255, 255, 255, 0.06);
  --bg-glass: rgba(255, 255, 255, 0.08);
  --bg-glass-strong: rgba(255, 255, 255, 0.16);
  --shell-bg:
    radial-gradient(ellipse 100% 70% at 50% 0%, oklch(60% 0.18 260 / 0.5), transparent 70%),
    radial-gradient(ellipse 80% 60% at 0% 100%, oklch(55% 0.18 320 / 0.4), transparent 70%),
    linear-gradient(180deg, #1a1830, #0e0c1e);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg-void);
  color: var(--ink-100);
  font-family: var(--font-body);
  font-feature-settings: "ss01", "cv11";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  height: 100%;
  overflow: hidden;
}

html { height: 100%; }

#root {
  position: relative;
  height: 100vh;
  height: 100dvh;
  width: 100vw;
}

/* App fills the real viewport. No fake-device bezel. */
.app-shell {
  position: relative;
  width: 100%;
  height: 100vh;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--shell-bg);
  overflow: hidden;
}

/* ===== STARFIELD ===== */
.stars {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}
.stars::before, .stars::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(1px 1px at 20% 30%, white, transparent),
    radial-gradient(1px 1px at 70% 60%, white, transparent),
    radial-gradient(1px 1px at 40% 80%, white, transparent),
    radial-gradient(2px 2px at 85% 15%, white, transparent),
    radial-gradient(1px 1px at 15% 75%, white, transparent),
    radial-gradient(1px 1px at 55% 25%, white, transparent),
    radial-gradient(2px 2px at 92% 88%, white, transparent),
    radial-gradient(1px 1px at 33% 55%, white, transparent);
  background-size: 400px 400px;
  background-repeat: repeat;
  opacity: 0.35;
}
.stars::after {
  background-size: 700px 700px;
  opacity: 0.5;
  /* animation: drift removed — animating background-position forces a full-viewport
     repaint every frame. Static starfield is visually equivalent at this opacity. */
}
/* @keyframes drift removed along with the animation above. */

/* ===== Noise overlay =====
   The SVG feTurbulence noise was re-rasterized every frame on every page
   that uses .noise (which is most of them). On phones and integrated GPUs
   this alone was burning ~5-8ms per frame. The aesthetic loss is ~0 at
   the 0.05 opacity we were drawing it at. Kept as an empty rule so any
   stray <div class="noise"> doesn't reflow the layout. */
.noise {
  display: none;
}

/* ===== Top Nav ===== */
.topnav {
  position: relative;
  z-index: 10;
  display: flex;
  align-items: center;
  padding: var(--space-4) var(--space-6);
  gap: var(--space-6);
  border-bottom: 1px solid var(--ink-line);
  /* Dropped backdrop-filter: blur(20px) — tanked frame rate on integrated GPUs.
     A slightly more opaque solid gives the same visual weight without GPU cost. */
  background: linear-gradient(180deg, rgba(10, 8, 32, 0.88), rgba(10, 8, 32, 0.78));
  flex-shrink: 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.01em;
}

.brand-mark {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background:
    conic-gradient(from 0deg,
      oklch(75% 0.2 300),
      oklch(75% 0.2 220),
      oklch(75% 0.2 160),
      oklch(75% 0.2 60),
      oklch(75% 0.2 300));
  position: relative;
  box-shadow: 0 0 20px oklch(75% 0.2 280 / 0.5);
}
.brand-mark::after {
  content: "";
  position: absolute;
  inset: 6px;
  border-radius: 4px;
  background: var(--bg-void);
}

.nav-pills {
  display: flex;
  gap: var(--space-1);
  margin-left: var(--space-8);
}

.nav-pill {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 13px;
  padding: 8px 14px;
  border-radius: var(--r-full);
  color: var(--ink-300);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: background-color 0.2s, color 0.2s;
  letter-spacing: 0.01em;
}
.nav-pill:hover {
  color: var(--ink-100);
  background: var(--bg-glass);
}
.nav-pill.active {
  color: var(--ink-100);
  background: var(--bg-glass-strong);
}

.teacher-brand-button {
  border: none;
  background: transparent;
  color: inherit;
  padding: 0;
  cursor: pointer;
  font: inherit;
  text-align: left;
}

.teacher-nav-badge {
  margin-left: 6px;
  padding: 1px 6px;
  border-radius: var(--r-full);
  background: oklch(75% 0.2 20);
  color: #0a0820;
  font-size: 10px;
  font-weight: 700;
}

.teacher-mobile-nav {
  display: none;
}

.nav-spacer { flex: 1; }

.nav-stats {
  display: flex;
  gap: var(--space-4);
  align-items: center;
}

.stat-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: var(--r-full);
  background: var(--bg-glass);
  border: 1px solid var(--ink-line);
  font-size: 12px;
  font-weight: 600;
  font-family: var(--font-mono);
}
.stat-chip svg { width: 14px; height: 14px; }
.stat-chip.streak { color: oklch(85% 0.16 60); }
.stat-chip.xp { color: oklch(85% 0.16 160); }
.stat-chip.gem { color: oklch(80% 0.16 280); }

.avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: conic-gradient(from 90deg, oklch(70% 0.2 280), oklch(70% 0.2 60));
  border: 1.5px solid rgba(255, 255, 255, 0.2);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 12px;
  color: white;
}

/* ===== Mobile bottom nav ===== */
.bottomnav {
  position: relative;
  z-index: 10;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 2px;
  padding: 10px 8px calc(20px + env(safe-area-inset-bottom));
  /* Dropped backdrop-filter — solid bottom on mobile reads better and frees the GPU. */
  background: linear-gradient(180deg, rgba(10, 8, 32, 0.92), rgba(10, 8, 32, 0.98));
  border-top: 1px solid var(--ink-line);
  flex-shrink: 0;
}
.bottomnav-btn {
  background: transparent;
  border: none;
  color: var(--ink-400);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  min-width: 0;
  padding: 6px 4px;
  cursor: pointer;
  font-size: 9.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  transition: color 0.2s;
}
.bottomnav-btn span {
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.bottomnav-btn.active { color: var(--ink-100); }
.bottomnav-btn svg { width: 22px; height: 22px; }
.bottomnav-btn.active svg { /* filter: drop-shadow removed — filter on animated/active elements triggers compositor skip. */ color: var(--w-primary); }

/* ===== Scroll area ===== */
.scroll-area {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  position: relative;
  z-index: 2;
  scrollbar-width: thin;
  scrollbar-color: var(--ink-line-strong) transparent;
}
.scroll-area::-webkit-scrollbar { width: 6px; height: 6px; }
.scroll-area::-webkit-scrollbar-thumb { background: var(--ink-line-strong); border-radius: 3px; }

/* ===== Buttons ===== */
.btn {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.005em;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
}
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: linear-gradient(135deg, var(--w-bright), var(--w-primary));
  color: #0a0820;
  padding: 14px 28px;
  border-radius: var(--r-full);
  font-size: 15px;
  box-shadow:
    0 10px 30px -10px var(--w-glow),
    inset 0 1px 0 rgba(255, 255, 255, 0.4);
}
.btn-primary:hover {
  box-shadow:
    0 14px 40px -8px var(--w-glow),
    inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.btn-ghost {
  background: var(--bg-glass);
  color: var(--ink-100);
  padding: 13px 26px;
  border-radius: var(--r-full);
  border: 1px solid var(--ink-line-strong);
  font-size: 15px;
  /* backdrop-filter dropped — too many .btn-ghost on screen at once to be free. */
}
.btn-ghost:hover { background: var(--bg-glass-strong); border-color: rgba(255, 255, 255, 0.3); }

.btn-sm { padding: 8px 14px; font-size: 12px; }

button:not(:disabled):focus-visible,
.btn:focus-visible,
.nav-pill:focus-visible {
  outline: 2px solid var(--w-bright);
  outline-offset: 3px;
}

/* ===== Cards / panels ===== */
.panel {
  /* backdrop-filter dropped: 10+ panels on screen at once was the single biggest
     paint cost on integrated GPUs. The slightly heavier solid (--bg-glass +
     border) reads the same at normal opacity. */
  background: var(--bg-glass);
  border: 1px solid var(--ink-line);
  border-radius: var(--r-lg);
}

.panel-bordered {
  background: linear-gradient(180deg, var(--bg-glass), transparent);
  border: 1px solid var(--ink-line);
  border-radius: var(--r-lg);
  position: relative;
  overflow: hidden;
}

/* Type ramps */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-300);
  font-weight: 500;
}

.display-xl { font-family: var(--font-display); font-weight: 700; font-size: clamp(40px, 6vw, 84px); line-height: 0.95; letter-spacing: -0.035em; }
.display-lg { font-family: var(--font-display); font-weight: 700; font-size: clamp(32px, 4vw, 56px); line-height: 1; letter-spacing: -0.03em; }
.display-md { font-family: var(--font-display); font-weight: 700; font-size: clamp(24px, 3vw, 36px); line-height: 1.05; letter-spacing: -0.02em; }
.display-sm { font-family: var(--font-display); font-weight: 600; font-size: 22px; line-height: 1.1; letter-spacing: -0.01em; }

.text-mono { font-family: var(--font-mono); }
.muted { color: var(--ink-300); }

/* Page transition */
.page {
  animation: pageIn 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}
@keyframes pageIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Utility */
.hidden { display: none !important; }
.row { display: flex; gap: var(--space-4); }
.col { display: flex; flex-direction: column; gap: var(--space-4); }
.center { display: flex; align-items: center; justify-content: center; }

/* Iridescent text */
.iridescent {
  background: linear-gradient(135deg,
    oklch(85% 0.15 300) 0%,
    oklch(85% 0.15 240) 30%,
    oklch(85% 0.15 180) 60%,
    oklch(88% 0.15 60) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* Glow ring (world card) */
.glow-ring {
  position: relative;
}
.glow-ring::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, var(--w-bright), transparent 50%, var(--w-primary));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

/* Progress bar */
.progress {
  height: 6px;
  background: var(--bg-glass);
  border-radius: var(--r-full);
  overflow: hidden;
  position: relative;
}
.progress-fill {
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--w-deep), var(--w-bright));
  border-radius: var(--r-full);
  position: relative;
  transform-origin: left center;
  transition: transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}
.progress-fill::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
  animation: shimmer 2.5s linear infinite;
  will-change: transform;
}
@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

@media (prefers-reduced-motion: reduce) {
  .progress-fill::after {
    animation: none;
  }
}

/* Hover lift */
.lift {
  position: relative;
  transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}
.lift::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  opacity: 0;
  transition: opacity 0.3s cubic-bezier(0.22, 1, 0.36, 1);
  pointer-events: none;
  z-index: -1;
  will-change: opacity;
}
.lift:hover { transform: translateY(-3px); }
.lift:hover::before { opacity: 1; }

/* ===== Planet animations ===== */
@keyframes planet-slide {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}
@keyframes planet-wobble {
  0%, 100% { transform: translateX(-12%); }
  50% { transform: translateX(-38%); }
}
/* @keyframes nebula-drift removed — the nebula clouds are static now (see landing.jsx). */
/* @keyframes shooting-star removed — shooting-star elements were removed from JSX (see landing.jsx). */
@keyframes float-y {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}
@keyframes ring-shimmer {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 1; }
}

/* .shooting-star removed — element no longer exists in JSX (confirmed dead code). */

/* World-tinted glass */
.world-glass {
  background:
    radial-gradient(ellipse 80% 60% at 0% 0%, var(--w-tint), transparent 60%),
    var(--bg-glass);
  border: 1px solid var(--ink-line);
  position: relative;
  overflow: hidden;
}
.world-glass::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top right, var(--w-glow), transparent 60%);
  opacity: 0.4;
  pointer-events: none;
}

/* ===== Student journey layer ===== */
.mentor-briefing {
  position: relative;
  display: grid;
  gap: 12px;
  padding: 14px;
  border-radius: 16px;
  background:
    radial-gradient(circle at 30% 0%, oklch(82% var(--w-c) var(--w-h) / 0.18), transparent 58%),
    rgba(0, 0, 0, 0.3);
  border: 1px solid var(--ink-line);
  overflow: hidden;
}
.mentor-briefing::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent, rgba(255, 255, 255, 0.05));
  pointer-events: none;
}
.mentor-portrait {
  position: relative;
  z-index: 1;
  width: 96px;
  height: 96px;
  margin: 0 auto;
  border-radius: 26px;
  background-image: url("assets/mentor-guide-talk.webp?v=2");
  background-repeat: no-repeat;
  background-size: 200% 200%;
  background-position: 0% 0%;
  animation:
    guide-talk 2.4s steps(1, end) infinite,
    guide-breathe 3.2s ease-in-out infinite;
  filter: drop-shadow(0 0 18px oklch(82% var(--w-c) var(--w-h) / 0.45));
}
.mentor-copy {
  position: relative;
  z-index: 1;
  min-width: 0;
}
.mentor-eyebrow {
  margin-bottom: 6px;
  color: var(--w-bright);
}
.mentor-title {
  font-family: var(--font-display);
  font-size: 18px;
  line-height: 1.05;
  font-weight: 700;
  margin-bottom: 8px;
}
.mentor-text {
  color: var(--ink-200);
  font-size: 12px;
  line-height: 1.45;
  margin-bottom: 12px;
}
.mentor-loop {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
  margin-bottom: 12px;
}
.mentor-loop span {
  min-width: 0;
  padding: 5px 7px;
  border-radius: 999px;
  border: 1px solid oklch(85% var(--w-c) var(--w-h) / 0.18);
  background: oklch(85% var(--w-c) var(--w-h) / 0.08);
  color: var(--ink-100);
  font-family: var(--font-mono);
  font-size: 9px;
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.mentor-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.learning-compass {
  padding: 18px;
}
.learning-compass-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 18px;
  margin-bottom: 16px;
}
.learning-compass-score {
  text-align: right;
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1;
}
.learning-compass-score span {
  display: block;
  font-size: 34px;
  color: var(--w-bright);
}
.learning-compass-score small {
  color: var(--ink-300);
  font-family: var(--font-mono);
  font-size: 10px;
}
.learning-stage-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 8px;
}
.learning-stage {
  min-width: 0;
  display: flex;
  gap: 9px;
  padding: 11px;
  border-radius: 13px;
  border: 1px solid var(--ink-line);
  background: rgba(255, 255, 255, 0.035);
}
.learning-stage.active {
  border-color: var(--w-primary);
  background: var(--w-tint);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}
.learning-stage.done {
  border-color: oklch(72% 0.16 160 / 0.32);
  background: oklch(72% 0.16 160 / 0.08);
}
.learning-stage.locked {
  opacity: 0.58;
}
.learning-stage-dot {
  width: 26px;
  height: 26px;
  flex: 0 0 26px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-glass-strong);
  color: var(--ink-100);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 11px;
}
.learning-stage.active .learning-stage-dot {
  color: #0a0820;
  background: var(--w-primary);
}
.learning-stage.done .learning-stage-dot {
  color: #061510;
  background: oklch(72% 0.16 160);
}
.learning-stage-body {
  min-width: 0;
}
.learning-stage-title {
  font-family: var(--font-display);
  font-size: 13px;
  line-height: 1.1;
  font-weight: 700;
  margin-bottom: 3px;
}
.learning-stage-range {
  color: var(--ink-300);
  font-family: var(--font-mono);
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 6px;
}
.learning-stage-promise {
  color: var(--ink-300);
  font-size: 11px;
  line-height: 1.35;
}
.next-move-lab {
  position: relative;
  display: grid;
  grid-template-columns: 116px minmax(0, 1fr) minmax(280px, 0.72fr);
  gap: 18px;
  align-items: center;
  padding: 18px;
  overflow: hidden;
  border-color: oklch(82% 0.14 205 / 0.22);
  background:
    radial-gradient(circle at 82px 52px, oklch(82% 0.18 205 / 0.18), transparent 44%),
    radial-gradient(circle at 72% 20%, oklch(86% 0.14 72 / 0.1), transparent 38%),
    var(--bg-glass);
}
.next-move-lab::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.045), transparent);
  opacity: 0.6;
  pointer-events: none;
}
.next-move-art,
.next-move-main,
.next-move-proof {
  position: relative;
  z-index: 1;
}
.next-move-art {
  width: 106px;
  height: 106px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 24px;
  background:
    radial-gradient(circle, oklch(82% 0.18 205 / 0.13), transparent 68%),
    rgba(255, 255, 255, 0.035);
  border: 1px solid oklch(82% 0.14 205 / 0.16);
}
.next-move-art img {
  width: 118px;
  height: 118px;
  object-fit: contain;
  filter: drop-shadow(0 0 18px oklch(82% 0.18 205 / 0.42));
}
.next-move-kicker {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  align-items: center;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.next-move-kicker span {
  color: oklch(84% 0.14 205);
}
.next-move-kicker strong {
  color: oklch(88% 0.14 72);
}
.next-move-title {
  max-width: 720px;
  color: var(--ink-100);
  font-family: var(--font-display);
  font-size: clamp(22px, 2.1vw, 34px);
  font-weight: 800;
  line-height: 1.05;
  margin-bottom: 9px;
}
.next-move-copy {
  max-width: 720px;
  margin: 0 0 12px;
  color: var(--ink-200);
  font-size: 14px;
  line-height: 1.48;
}
.next-move-loop {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 7px;
  max-width: 600px;
}
.next-move-loop span {
  min-width: 0;
  padding: 7px 9px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid var(--ink-line);
  color: var(--ink-200);
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 800;
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.next-move-proof {
  display: grid;
  gap: 8px;
}
.next-move-stat-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}
.next-move-stat-row > div,
.next-move-card {
  min-width: 0;
  padding: 9px 10px;
  border-radius: 12px;
  background: rgba(0, 0, 0, 0.24);
  border: 1px solid var(--ink-line);
}
.next-move-stat-row span,
.next-move-card span {
  display: block;
  margin-bottom: 4px;
  color: oklch(84% 0.14 205);
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.next-move-stat-row strong {
  display: block;
  color: var(--ink-100);
  font-family: var(--font-display);
  font-size: 16px;
  line-height: 1.05;
  overflow-wrap: anywhere;
}
.next-move-card p {
  margin: 0;
  color: var(--ink-200);
  font-size: 11.5px;
  line-height: 1.4;
}
.next-move-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.practice-coach {
  position: relative;
  display: grid;
  grid-template-columns: 88px minmax(0, 0.7fr) minmax(0, 1.4fr);
  gap: 16px;
  align-items: center;
  padding: 18px;
  margin-bottom: 28px;
  overflow: hidden;
  border-color: oklch(82% 0.14 205 / 0.22);
  background:
    radial-gradient(circle at 64px 46px, oklch(82% 0.18 205 / 0.14), transparent 46%),
    radial-gradient(circle at 74% 0%, oklch(86% 0.14 72 / 0.09), transparent 40%),
    var(--bg-glass);
}
.practice-coach::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.04), transparent);
  pointer-events: none;
}
.practice-coach-art,
.practice-coach-main,
.practice-coach-picks {
  position: relative;
  z-index: 1;
}
.practice-coach-art {
  width: 78px;
  height: 78px;
  border-radius: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(circle, oklch(82% 0.18 205 / 0.13), transparent 70%),
    rgba(255, 255, 255, 0.035);
  border: 1px solid oklch(82% 0.14 205 / 0.16);
}
.practice-coach-art img {
  width: 92px;
  height: 92px;
  object-fit: contain;
  filter: drop-shadow(0 0 16px oklch(82% 0.18 205 / 0.38));
}
.practice-coach-main h2 {
  margin: 6px 0 8px;
}
.practice-coach-main p {
  margin: 0;
  color: var(--ink-200);
  font-size: 13px;
  line-height: 1.45;
}
.practice-coach-picks {
  display: grid;
  gap: 8px;
}
.practice-pick {
  min-width: 0;
  width: 100%;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) 18px;
  gap: 10px;
  align-items: center;
  padding: 11px;
  border-radius: 13px;
  border: 1px solid oklch(78% var(--w-c) var(--w-h) / 0.24);
  background:
    radial-gradient(circle at 0% 0%, oklch(78% var(--w-c) var(--w-h) / 0.12), transparent 52%),
    rgba(255, 255, 255, 0.045);
  color: var(--ink-100);
  cursor: pointer;
  font-family: inherit;
  text-align: left;
}
.practice-pick-rank {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #080615;
  background: oklch(82% var(--w-c) var(--w-h));
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 800;
}
.practice-pick-body {
  min-width: 0;
}
.practice-pick-role {
  margin-bottom: 2px;
  color: oklch(86% var(--w-c) var(--w-h));
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.practice-pick-title {
  color: var(--ink-100);
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.12;
}
.practice-pick-meta {
  margin-top: 3px;
  color: var(--ink-300);
  font-size: 11px;
  line-height: 1.25;
}
.practice-pick-reason {
  margin-top: 5px;
  color: var(--ink-300);
  font-size: 11px;
  line-height: 1.35;
}
.skill-roadmap-brief {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(220px, 0.45fr);
  gap: 16px;
  align-items: center;
  padding: 18px;
  margin-bottom: 20px;
  background:
    radial-gradient(circle at 0% 0%, oklch(82% 0.18 205 / 0.1), transparent 55%),
    var(--bg-glass);
}
.skill-roadmap-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(72px, 1fr));
  gap: 8px;
}
.skill-roadmap-stats div,
.skill-roadmap-current {
  min-width: 0;
  padding: 10px 12px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid var(--ink-line);
}
.skill-roadmap-stats span {
  display: block;
  color: var(--ink-100);
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 800;
  line-height: 1;
}
.skill-roadmap-stats small {
  color: var(--ink-300);
  font-family: var(--font-mono);
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.skill-roadmap-current {
  cursor: pointer;
  color: var(--ink-100);
  font-family: inherit;
  text-align: left;
}
.skill-roadmap-current span {
  display: block;
  margin-bottom: 4px;
  color: oklch(84% 0.14 205);
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.skill-roadmap-current strong {
  display: block;
  font-family: var(--font-display);
  font-size: 16px;
  line-height: 1.12;
}
.skill-roadmap-current small {
  display: block;
  margin-top: 4px;
  color: var(--ink-300);
  font-size: 11px;
}
.mission-briefing {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 290px;
  gap: 18px;
  padding: 22px;
  border-color: oklch(85% var(--w-c) var(--w-h) / 0.18);
  background:
    radial-gradient(circle at 0% 0%, var(--w-tint), transparent 55%),
    var(--bg-glass);
}
.mission-briefing-title {
  margin: 8px 0 10px;
}
.mission-briefing-text {
  max-width: 720px;
  margin: 0 0 16px;
  color: var(--ink-200);
  font-size: 15px;
  line-height: 1.5;
}
.mission-loop-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}
.mission-loop-grid span {
  min-width: 0;
  padding: 9px 10px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid var(--ink-line);
  color: var(--ink-200);
  font-family: var(--font-mono);
  font-size: 10px;
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.python-mission-prep {
  margin-top: 12px;
  padding: 12px;
  border-radius: 14px;
  background:
    radial-gradient(circle at 0% 0%, oklch(82% 0.14 205 / 0.12), transparent 56%),
    rgba(0, 0, 0, 0.18);
  border: 1px solid oklch(82% 0.12 205 / 0.2);
}
.python-mission-prep-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 9px;
}
.python-mission-prep-head span {
  color: oklch(88% 0.14 72);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.07em;
}
.python-mission-prep-head strong {
  color: var(--ink-100);
  font-family: var(--font-display);
  font-size: 13px;
  line-height: 1.15;
  text-align: right;
}
.python-mission-prep-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}
.python-mission-prep-card {
  min-width: 0;
  padding: 9px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid var(--ink-line);
}
.python-mission-prep-card span {
  display: block;
  margin-bottom: 5px;
  color: oklch(86% 0.14 205);
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.07em;
}
.python-mission-prep-card p {
  margin: 0;
  color: var(--ink-200);
  font-size: 11.5px;
  line-height: 1.38;
}
.python-mission-prep-note {
  margin-top: 9px;
  color: var(--ink-300);
  font-size: 11.5px;
  line-height: 1.4;
}
.mission-briefing-side {
  padding: 16px;
  border-radius: 14px;
  background: rgba(0, 0, 0, 0.24);
  border: 1px solid var(--ink-line);
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.mission-vet-copy {
  color: var(--ink-200);
  font-size: 13px;
  line-height: 1.45;
}
.mission-reward-note {
  color: var(--ink-300);
  font-size: 11px;
  line-height: 1.4;
}
.victory-debrief {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 12px;
  text-align: left;
}
.victory-debrief-card {
  position: relative;
  overflow: hidden;
  padding: 15px;
  border-radius: 14px;
  background:
    radial-gradient(circle at 0% 0%, var(--w-tint), transparent 58%),
    rgba(255, 255, 255, 0.045);
  border: 1px solid var(--ink-line);
}
.victory-debrief-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(105deg, transparent 18%, rgba(255, 255, 255, 0.12) 45%, transparent 72%);
  transform: translateX(-120%);
  animation: fx-sweep 2.8s ease-in-out 0.3s both;
  pointer-events: none;
}
.victory-debrief-card.unlock {
  border-color: oklch(82% 0.16 60 / 0.28);
  background:
    radial-gradient(circle at 100% 0%, oklch(82% 0.16 60 / 0.16), transparent 58%),
    rgba(255, 255, 255, 0.045);
}
.victory-debrief-title {
  margin: 7px 0 6px;
  color: var(--w-bright);
  font-family: var(--font-display);
  font-size: 18px;
  line-height: 1.1;
  font-weight: 700;
}
.victory-debrief-copy {
  color: var(--ink-200);
  font-size: 12px;
  line-height: 1.42;
}

@media (max-width: 980px) {
  .learning-stage-grid {
    grid-template-columns: 1fr;
  }
  .next-move-lab {
    grid-template-columns: 90px minmax(0, 1fr);
    align-items: start;
  }
  .next-move-art {
    width: 86px;
    height: 86px;
    border-radius: 20px;
  }
  .next-move-art img {
    width: 98px;
    height: 98px;
  }
  .next-move-proof {
    grid-column: 1 / -1;
  }
  .practice-coach {
    grid-template-columns: 76px minmax(0, 1fr);
  }
  .practice-coach-art {
    width: 72px;
    height: 72px;
  }
  .practice-coach-art img {
    width: 86px;
    height: 86px;
  }
  .practice-coach-picks {
    grid-column: 1 / -1;
  }
  .skill-roadmap-brief {
    grid-template-columns: 1fr;
  }
  .skill-roadmap-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .mission-briefing {
    grid-template-columns: 1fr;
  }
  .mission-loop-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .python-mission-prep-grid {
    grid-template-columns: 1fr;
  }
  .victory-debrief {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .teacher-topnav {
    flex-wrap: wrap;
    gap: 10px;
    padding: 12px 14px;
  }
  .teacher-topnav .brand {
    min-width: 0;
    flex: 1 1 auto;
  }
  .teacher-topnav .brand > span:first-of-type {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
  .teacher-topnav .nav-spacer {
    display: none;
  }
  .teacher-signout-btn {
    padding: 7px 10px;
    font-size: 11px;
    flex: 0 0 auto;
  }
  .teacher-avatar {
    width: 30px;
    height: 30px;
    flex: 0 0 auto;
    cursor: default;
  }
  .teacher-mobile-nav {
    flex: 0 0 100%;
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 4px;
    min-width: 0;
  }
  .teacher-mobile-nav .nav-pill {
    width: 100%;
    min-width: 0;
    padding: 8px 4px;
    border: 1px solid var(--ink-line);
    background: rgba(255, 255, 255, 0.035);
    font-size: 10.5px;
    line-height: 1.1;
    letter-spacing: 0;
  }
  .teacher-mobile-nav .nav-pill.active {
    border-color: var(--ink-line-strong);
    background: var(--bg-glass-strong);
  }
  .teacher-mobile-label {
    display: block;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
  .teacher-mobile-nav .teacher-nav-badge {
    margin-left: 4px;
    padding: 0 4px;
    font-size: 9px;
  }
  .learning-compass {
    padding: 14px;
  }
  .learning-compass-head {
    align-items: flex-start;
  }
  .next-move-lab {
    grid-template-columns: 72px minmax(0, 1fr);
    gap: 12px;
    padding: 14px;
  }
  .next-move-art {
    width: 68px;
    height: 68px;
    border-radius: 18px;
  }
  .next-move-art img {
    width: 82px;
    height: 82px;
  }
  .next-move-title {
    font-size: 21px;
  }
  .next-move-copy {
    font-size: 13px;
  }
  .next-move-loop {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .next-move-actions .btn {
    justify-content: center;
    flex: 1 1 120px;
  }
  .practice-coach {
    grid-template-columns: 62px minmax(0, 1fr);
    gap: 12px;
    padding: 14px;
    margin-bottom: 22px;
  }
  .practice-coach-art {
    width: 58px;
    height: 58px;
    border-radius: 17px;
  }
  .practice-coach-art img {
    width: 72px;
    height: 72px;
  }
  .practice-pick {
    grid-template-columns: 32px minmax(0, 1fr) 16px;
    padding: 10px;
  }
  .practice-pick-rank {
    width: 32px;
    height: 32px;
  }
  .skill-roadmap-brief {
    padding: 14px;
  }
  .skill-roadmap-stats {
    gap: 6px;
  }
  .skill-roadmap-stats div,
  .skill-roadmap-current {
    padding: 9px;
  }
  .skill-roadmap-stats span {
    font-size: 20px;
  }
  .mission-briefing {
    padding: 16px;
  }
  .mission-loop-grid {
    grid-template-columns: 1fr;
  }
  .python-mission-prep-head {
    align-items: flex-start;
    flex-direction: column;
  }
  .python-mission-prep-head strong {
    text-align: left;
  }
}

/* World icon (abstract glyph) */
.world-glyph {
  width: 56px;
  height: 56px;
  border-radius: var(--r-md);
  background:
    radial-gradient(circle at 30% 30%, var(--w-bright), var(--w-deep));
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 700;
  color: rgba(255, 255, 255, 0.9);
  position: relative;
  box-shadow: 0 6px 20px -6px var(--w-glow);
  flex-shrink: 0;
}
.world-glyph::after {
  content: "";
  position: absolute;
  inset: 1px;
  border-radius: inherit;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

/* Generic util scroll-snap row */
.snap-row {
  display: flex;
  gap: var(--space-4);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding-bottom: 8px;
}
.snap-row > * {
  scroll-snap-align: start;
  flex-shrink: 0;
}

/* Animated halo */
@keyframes halo {
  0%, 100% { opacity: 0.4; transform: scale(1); }
  50% { opacity: 0.7; transform: scale(1.05); }
}
.halo { animation: halo 4s ease-in-out infinite; will-change: transform, opacity; }

/* Compact mode tightens */
[data-density="compact"] {
  --d: 0.7;
}
[data-density="compact"] .display-xl { font-size: clamp(32px, 4.5vw, 60px); }
[data-density="compact"] .display-lg { font-size: clamp(26px, 3.5vw, 44px); }
[data-density="compact"] .display-md { font-size: clamp(20px, 2.5vw, 30px); }

/* ===== WorldMap perf: compositor-owned transitions =====
   These classes replace inline style objects rebuilt on every hover so that
   opacity and box-shadow transitions run on the compositor thread with zero
   JS overhead per frame. */

/* Nebula blobs — opacity is the only thing that changes on hover. */
.world-nebula {
  opacity: 0.5;
  transition: opacity 0.4s;
}
.world-nebula--active {
  opacity: 1;
}

/* World node inner square — box-shadow variant swapped via class toggle. */
.world-node-inner {
  box-shadow: none;
}
.world-node-inner--unlocked {
  box-shadow: 0 0 20px oklch(80% var(--node-chroma) var(--node-hue) / 0.4);
}
.world-node-inner--unlocked.world-node-inner--active {
  box-shadow: 0 0 40px oklch(80% var(--node-chroma) var(--node-hue) / 0.7);
}

/* =====================================================================
   Lesson FX — shared animation vocabulary for the ten lesson games.
   Consumed by lesson-fx.jsx and the per-lesson modules. Transform/opacity
   only (GPU-cheap); one-shot unless a lesson deliberately loops one.
   ===================================================================== */
@keyframes fx-spark {
  /* particle burst — --dx/--dy are set inline per spark */
  from { transform: translate(0, 0) scale(1); opacity: 1; }
  to   { transform: translate(var(--dx), var(--dy)) scale(0.25); opacity: 0; }
}
@keyframes fx-rise {
  from { opacity: 0; transform: translateY(9px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fx-pop {
  0%   { opacity: 0; transform: scale(0.82); }
  60%  { opacity: 1; transform: scale(1.05); }
  100% { opacity: 1; transform: scale(1); }
}
@keyframes fx-shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-7px); }
  40% { transform: translateX(7px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}
@keyframes fx-flash-fade {
  from { opacity: 1; }
  to   { opacity: 0; }
}
@keyframes fx-glow-pulse {
  0%, 100% { opacity: 0.45; }
  50%      { opacity: 1; }
}
@keyframes fx-float {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-6px); }
}
@keyframes fx-sweep {
  from { transform: translateX(-120%); }
  to   { transform: translateX(120%); }
}
@keyframes guide-talk {
  0%, 18% { background-position: 0% 0%; }
  24%, 42% { background-position: 100% 0%; }
  48%, 66% { background-position: 0% 100%; }
  72%, 100% { background-position: 100% 100%; }
}
@keyframes guide-breathe {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-2px) scale(1.02); }
}
@keyframes guide-scanline {
  0% { transform: translateY(-120%); opacity: 0; }
  15%, 75% { opacity: 0.45; }
  100% { transform: translateY(120%); opacity: 0; }
}

/* one-shot helper classes the lessons can drop straight onto an element */
.fx-shake     { animation: fx-shake 380ms cubic-bezier(.36,.07,.19,.97) both; }
.fx-pop       { animation: fx-pop 320ms cubic-bezier(.2,.7,.3,1) both; }
.fx-rise      { animation: fx-rise 380ms cubic-bezier(.2,.7,.3,1) both; }

.fx-flash-good, .fx-flash-bad {
  position: relative;
}
.fx-flash-good::after, .fx-flash-bad::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  will-change: opacity;
}
.fx-flash-good::after {
  background-color: oklch(72% 0.18 150 / 0.40);
  animation: fx-flash-fade 720ms ease-out forwards;
}
.fx-flash-bad::after {
  background-color: oklch(65% 0.21 25 / 0.40);
  animation: fx-flash-fade 720ms ease-out forwards;
}

@media (prefers-reduced-motion: reduce) {
  .fx-shake, .fx-pop, .fx-rise { animation: none; }
  .fx-flash-good::after, .fx-flash-bad::after { animation: none; }
}

/* --- Lesson guide portrait: generated 2x2 talking sprite sheet. --- */
.lesson-guide {
  position: relative;
  display: flex;
  align-items: center;
  gap: 9px;
  min-width: 152px;
  padding: 5px 12px 5px 6px;
  border: 1px solid oklch(85% var(--w-c) var(--w-h) / 0.22);
  border-radius: var(--r-full);
  background:
    radial-gradient(circle at 24px 22px, oklch(85% var(--w-c) var(--w-h) / 0.2), transparent 58%),
    rgba(255, 255, 255, 0.045);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.08);
  overflow: hidden;
}
.lesson-guide::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 0%, rgba(255,255,255,0.16) 50%, transparent 100%);
  animation: guide-scanline 3.4s ease-in-out infinite;
  pointer-events: none;
}
.lesson-guide-sprite {
  width: 42px;
  height: 42px;
  flex: 0 0 42px;
  border-radius: 50%;
  background-image: url("assets/mentor-guide-talk.webp?v=2");
  background-repeat: no-repeat;
  background-size: 200% 200%;
  background-position: 0% 0%;
  animation:
    guide-talk 2.2s steps(1, end) infinite,
    guide-breathe 3.2s ease-in-out infinite;
  filter: drop-shadow(0 0 10px oklch(82% var(--w-c) var(--w-h) / 0.45));
}
.lesson-guide-copy {
  position: relative;
  z-index: 1;
  display: grid;
  min-width: 0;
  line-height: 1;
}
.lesson-guide-kicker {
  color: var(--ink-400);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.lesson-guide-name {
  color: var(--ink-100);
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  max-width: 86px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
@media (max-width: 860px) {
  .lesson-guide { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  .lesson-guide::after,
  .lesson-guide-sprite {
    animation: none;
  }
}

/* --- Challenger World avatars: positioned imperatively by the rAF loop. --- */
.chal-avatar {
  position: absolute; left: 0; top: 0; width: 0; height: 0;
  will-change: transform;
}
.chal-nametag {
  position: absolute; left: 0; top: -56px;
  transform: translateX(-50%); white-space: nowrap;
  padding: 2px 8px; border-radius: 999px;
  font-family: var(--font-display); font-weight: 700; font-size: 11px;
}
.chal-sprite {
  position: absolute; left: 0; top: 0;
  transform: translate(-50%, -50%);
}
.chal-avatar[data-facing="left"] .chal-sprite {
  transform: translate(-50%, -50%) scaleX(-1);
}
.chal-bob { animation: chal-bob 2.6s ease-in-out infinite; }
@keyframes chal-bob {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-3px); }
}
@media (prefers-reduced-motion: reduce) {
  .chal-bob { animation: none; }
}

/* Task 1: Short-viewport scroll fallback */
@media (max-height: 600px) {
  html, body {
    height: auto !important;
    overflow-y: auto !important;
    overflow-x: hidden !important;
  }
  #root {
    height: auto !important;
    min-height: 100vh !important;
    min-height: 100dvh !important;
  }
  .app-shell {
    height: auto !important;
    min-height: 100vh !important;
    min-height: 100dvh !important;
    overflow-y: visible !important;
    overflow-x: hidden !important;
  }
  .scroll-area {
    overflow-y: visible !important;
  }
}

/* Task 3: Circuit Board Sizing */
.circuit-board-svg {
  width: 100%;
  max-width: 460px;
}

/* ═══════════ Platform polish layer ═══════════
   Shared motion, focus, and layout utilities used across the student hub,
   teacher console, and lesson chrome. Everything here degrades gracefully:
   reduced-motion users get instant state changes, keyboard users get a
   consistent ring on every interactive element. */

/* Consistent focus ring on every interactive element (buttons already
   covered above — this extends the same treatment to form fields, links
   and anything made focusable with tabIndex). */
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
a:focus-visible,
[role="button"]:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--w-bright, oklch(80% 0.16 280));
  outline-offset: 2px;
  border-radius: 4px;
}

/* Entrance: sections rise in once as they mount. Cheap (opacity+transform),
   GPU-composited, and a single non-looping run. */
.rise-in {
  animation: riseIn 0.55s cubic-bezier(0.22, 1, 0.36, 1) both;
}
.stagger > * {
  animation: riseIn 0.5s cubic-bezier(0.22, 1, 0.36, 1) both;
}
.stagger > *:nth-child(1) { animation-delay: 0.03s; }
.stagger > *:nth-child(2) { animation-delay: 0.09s; }
.stagger > *:nth-child(3) { animation-delay: 0.15s; }
.stagger > *:nth-child(4) { animation-delay: 0.21s; }
.stagger > *:nth-child(5) { animation-delay: 0.27s; }
.stagger > *:nth-child(6) { animation-delay: 0.33s; }
@keyframes riseIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Student hub — journey path. A row of planet nodes per tier, connected by a
   line. The node ring is painted with a conic-gradient (progress %); cleared
   worlds go solid green with a check; locked ones dim out. */
.jpath-row {
  display: flex;
  align-items: flex-start;
  overflow-x: auto;
  padding: 10px 2px 6px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}
.jnode {
  position: relative;
  flex: 1 0 auto;
  min-width: 72px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 2px 4px 4px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--ink-200);
  font-family: inherit;
  transition: transform 0.2s cubic-bezier(0.22, 1, 0.36, 1);
}
/* Connector line between nodes, drawn behind the orbs. */
.jnode::before {
  content: "";
  position: absolute;
  top: 27px;
  right: 50%;
  width: 100%;
  height: 2px;
  background: var(--ink-line);
  z-index: 0;
  pointer-events: none;
}
.jnode:first-child::before { display: none; }
.jnode:not(.locked):hover { transform: translateY(-2px); color: var(--ink-100); }
.jnode-orb {
  position: relative;
  z-index: 1;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.jnode-core {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 17px;
  background:
    radial-gradient(circle at 32% 30%, oklch(45% calc(var(--w-c, 0.12) * 1.2) var(--w-h, 280) / 0.9), oklch(22% var(--w-c, 0.12) var(--w-h, 280))),
    #0a0820;
  color: var(--ink-100);
  border: 1px solid rgba(255,255,255,0.12);
}
.jnode.locked { cursor: not-allowed; opacity: 0.45; }
.jnode.locked .jnode-core { filter: grayscale(0.8); }
.jnode.current .jnode-orb {
  box-shadow: 0 0 18px oklch(75% 0.16 var(--w-h, 280) / 0.7);
  animation: halo 2.4s ease-in-out infinite;
}
.jnode.current .jnode-label { color: var(--ink-100); font-weight: 600; }
.jnode-label {
  font-size: 9.5px;
  line-height: 1.25;
  text-align: center;
  max-width: 76px;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}
.jnode-here {
  position: absolute;
  top: -7px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  font-family: var(--font-mono);
  font-size: 8px;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 2px 7px;
  border-radius: 999px;
  background: oklch(80% 0.15 var(--w-h, 280));
  color: #0a0820;
  white-space: nowrap;
}

/* ═══════════ Multiverse map — tier galaxies ═══════════
   Three calm sections (curriculum tiers), each a breathing grid of planets.
   The detail inspector docks as a sticky side panel. */
.map-grid {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 22px;
  align-items: start;
}
.map-inspector { position: sticky; top: 18px; }
@media (max-width: 980px) {
  .map-grid { grid-template-columns: 1fr; }
  .map-inspector { position: static; }
}

.galaxy {
  --gx-h: 280;
  border: 1px solid oklch(60% 0.1 var(--gx-h) / 0.28);
  border-radius: 18px;
  padding: 15px 18px 20px;
  background:
    radial-gradient(130% 150% at 0% 0%, oklch(50% 0.13 var(--gx-h) / 0.10), transparent 58%),
    var(--bg-glass);
}
.galaxy-head { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.galaxy-num {
  font-family: var(--font-display); font-weight: 700; font-size: 24px; line-height: 1;
  color: oklch(86% 0.13 var(--gx-h)); width: 24px; flex-shrink: 0; text-align: center;
}
.galaxy-name { font-family: var(--font-display); font-weight: 600; font-size: 15px; margin-bottom: 7px; }
.galaxy-bar {
  height: 4px; border-radius: 999px; max-width: 340px;
  background: rgba(255, 255, 255, 0.07); overflow: hidden;
}
.galaxy-bar > i {
  display: block; height: 100%; border-radius: inherit; transform-origin: left center;
  background: linear-gradient(90deg, oklch(60% 0.16 var(--gx-h)), oklch(82% 0.16 var(--gx-h)));
  transition: transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}
.galaxy-count {
  font-family: var(--font-mono); font-size: 14px; font-weight: 700; flex-shrink: 0;
  color: oklch(86% 0.12 var(--gx-h));
}
.galaxy-row {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(106px, 1fr));
  gap: 8px 2px;
  justify-items: center;
}

.mplanet {
  --w-h: 280;
  position: relative;
  display: flex; flex-direction: column; align-items: center; gap: 5px;
  width: 100%; padding: 16px 4px 10px;
  border: none; background: none; cursor: pointer;
  color: var(--ink-100); font-family: inherit; border-radius: 14px;
  transition: transform 0.25s cubic-bezier(0.22, 1, 0.36, 1), background-color 0.2s;
  animation: mplanetIn 0.5s cubic-bezier(0.22, 1, 0.36, 1) backwards;
}
.mplanet:hover { background: rgba(255, 255, 255, 0.04); }
.mplanet.active { transform: translateY(-3px); }
.mplanet.locked { cursor: default; }
@keyframes mplanetIn {
  from { opacity: 0; transform: translateY(10px) scale(0.92); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
.mplanet-orb {
  position: relative; display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.mplanet-ring { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); }
.mplanet-body {
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-size: 22px; color: rgba(255, 255, 255, 0.95);
  filter: drop-shadow(0 1px 3px rgba(0, 0, 0, 0.5));
  box-shadow: inset -6px -8px 16px rgba(5, 2, 18, 0.7), 0 0 22px oklch(72% 0.16 var(--w-h) / 0.42);
  transition: box-shadow 0.3s;
}
.mplanet.active .mplanet-body { box-shadow: inset -6px -8px 16px rgba(5, 2, 18, 0.7), 0 0 32px oklch(74% 0.16 var(--w-h) / 0.65); }
.mplanet.locked .mplanet-body {
  color: rgba(255, 255, 255, 0.32); filter: none;
  box-shadow: inset -6px -8px 16px rgba(0, 0, 0, 0.72);
}
.mplanet-badge {
  position: absolute; left: -2px; bottom: -2px;
  width: 21px; height: 21px; border-radius: 50%; border: 2px solid #07060f;
  display: flex; align-items: center; justify-content: center;
  font: 700 10px/1 var(--font-mono);
}
.mplanet-py {
  position: absolute; right: -8px; top: -7px; min-width: 26px; height: 20px; padding: 0 6px;
  border-radius: 999px; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, oklch(84% 0.15 205), oklch(88% 0.15 72));
  color: #07101d; border: 2px solid #07060f; font: 900 9px/1 var(--font-mono); letter-spacing: 0.02em;
}
.mplanet.current .mplanet-orb::before {
  content: ""; position: absolute; left: 50%; top: 50%; width: 138%; height: 138%;
  transform: translate(-50%, -50%); border-radius: 50%; pointer-events: none; z-index: -1;
  background: radial-gradient(circle, oklch(85% 0.16 75 / 0.4), transparent 70%);
  animation: halo 3s ease-in-out infinite;
}
.mplanet-here {
  position: absolute; top: 0; left: 50%; transform: translateX(-50%); z-index: 3;
  padding: 2px 8px; border-radius: 999px; white-space: nowrap;
  background: oklch(85% 0.15 75); color: #0a0820;
  font: 700 8px/1 var(--font-mono); letter-spacing: 0.08em; text-transform: uppercase;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.4);
}
.mplanet-name {
  font-family: var(--font-display); font-weight: 600; font-size: 11.5px; margin-top: 3px;
  max-width: 100px; text-align: center; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.mplanet.locked .mplanet-name { color: var(--ink-300); }
.mplanet-sub {
  font-family: var(--font-mono); font-size: 8.5px; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--ink-400); max-width: 100px; text-align: center;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.mplanet.current .mplanet-sub { color: oklch(86% 0.15 75); }

/* Teacher console — tab rail */
.tab-rail {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  gap: 4px;
  align-items: flex-end;
  background: linear-gradient(180deg, rgba(10, 8, 32, 0.97), rgba(10, 8, 32, 0.94));
  border-bottom: 1px solid var(--ink-line);
  margin-bottom: 18px;
}
.seg-tab {
  position: relative;
  padding: 11px 20px 13px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 14px;
  color: var(--ink-300);
  background: transparent;
  border: none;
  cursor: pointer;
  border-radius: 10px 10px 0 0;
  transition: color 0.2s, background-color 0.2s;
}
.seg-tab:hover { color: var(--ink-100); background: var(--bg-glass); }
.seg-tab.active { color: var(--ink-100); }
.seg-tab.active::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: -1px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--iris-1), var(--iris-2));
}
.tab-badge {
  margin-left: 8px;
  padding: 1px 7px;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  background: var(--bg-glass-strong);
  color: var(--ink-200);
}
.tab-badge.alert {
  background: oklch(75% 0.2 20);
  color: #0a0820;
}

/* Teacher console — action queue cards */
.queue-card {
  --act-h: 60;
  border-radius: 14px;
  border: 1px solid oklch(72% 0.15 var(--act-h) / 0.3);
  background: oklch(60% 0.15 var(--act-h) / 0.07);
  overflow: hidden;
  transition: border-color 0.25s, box-shadow 0.25s;
}
.queue-card.expanded {
  border-color: oklch(78% 0.16 var(--act-h) / 0.6);
  box-shadow: 0 0 24px -10px oklch(70% 0.18 var(--act-h) / 0.5);
}
.queue-head {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 12px 14px;
  background: transparent;
  border: none;
  color: var(--ink-100);
  font-family: inherit;
  font-size: 13px;
  cursor: pointer;
  text-align: left;
  min-height: 44px;
}
.queue-count {
  min-width: 24px;
  height: 24px;
  padding: 0 7px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 12px;
  background: oklch(75% 0.17 var(--act-h) / 0.9);
  color: #0a0820;
  flex-shrink: 0;
}
.queue-body {
  padding: 2px 14px 14px;
}

/* Teacher insights — vertical bar columns (activity, histogram) */
.pulse-cols {
  display: flex;
  align-items: flex-end;
  gap: 6px;
  height: 56px;
}
.pulse-cols > i {
  flex: 1;
  display: block;
  border-radius: 4px 4px 2px 2px;
  background: linear-gradient(180deg, oklch(78% 0.14 200), oklch(55% 0.13 230));
  min-height: 3px;
  transition: height 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

/* Reduced-motion: collapse the polish-layer motion to instant state changes. */
@media (prefers-reduced-motion: reduce) {
  .rise-in, .stagger > * { animation: none; }
  .page { animation: none; }
  .jnode, .queue-card, .seg-tab, .lift { transition: none; }
  .jnode.current .jnode-orb { animation: none; }
  .mplanet { animation: none; }
  .mplanet.current .mplanet-orb::before { animation: none; }
  .galaxy-bar > i { transition: none; }
  .pulse-cols > i, .progress-fill { transition: none; }
}

/* ── Print: Class Report → PDF ──────────────────────────────────────────
   When the teacher prints the Class Report we hide the entire app and show
   only the light-themed .report-sheet, full-page on white. The report is
   styled with its own light tokens so it reads correctly even when the
   browser's "background graphics" option is off. */
@media print {
  body * { visibility: hidden !important; }
  .report-sheet, .report-sheet * { visibility: visible !important; }
  .report-sheet {
    position: absolute !important;
    left: 0; top: 0;
    width: 100% !important;
    margin: 0 !important;
    padding: 0 6mm !important;
    box-shadow: none !important;
    border-radius: 0 !important;
  }
  .no-print { display: none !important; }
  @page { margin: 12mm; }
}