:root {
  --bg: #090e1a;
  --surface: #111a2e;
  --panel: #1a2744;
  --line: #293d66;
  --text: #f0f6fc;
  --muted: #94a3b8;
  --cyan: #38bdf8;
  --teal: #10b981;
  --gold: #f59e0b;
  --display: "Bricolage Grotesque", system-ui, sans-serif;
  --body: "Lexend", system-ui, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; user-select: none; }

body {
  font-family: var(--body);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  background: var(--surface);
  border-bottom: 2px solid var(--line);
  padding: 0.75rem 1.2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: inherit;
}

.brand-icon {
  font-size: 2rem;
  background: linear-gradient(135deg, #0284c7, #0369a1);
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.3);
}

.brand h1 {
  font-family: var(--display);
  font-size: 1.35rem;
  font-weight: 800;
  color: #fff;
}

.brand p {
  font-size: 0.8rem;
  color: var(--muted);
}

.controls-bar {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.controls-bar select {
  font-family: var(--body);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.5rem 0.8rem;
  border-radius: 10px;
  background: var(--panel);
  border: 1px solid var(--line);
  color: #fff;
  cursor: pointer;
  outline: none;
}

.btn-header {
  font-family: var(--body);
  font-size: 0.85rem;
  font-weight: 700;
  padding: 0.5rem 1rem;
  border-radius: 10px;
  background: var(--panel);
  border: 1px solid var(--line);
  color: #fff;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-header:hover {
  background: var(--cyan);
  color: #090e1a;
}

main {
  flex: 1;
  max-width: 900px;
  width: 100%;
  margin: 0 auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

/* Shape HUD */
.shape-hud {
  background: var(--surface);
  border: 2px solid var(--line);
  border-radius: 16px;
  padding: 0.8rem 1.4rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  box-shadow: 0 6px 20px rgba(0,0,0,0.3);
}

.hud-item {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hud-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--muted);
}

.hud-val {
  font-family: var(--display);
  font-size: 1.35rem;
  font-weight: 800;
  color: #fff;
}

.mission-box {
  flex: 1;
  text-align: center;
}

.topic-tag {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--cyan);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.mission-text {
  font-family: var(--display);
  font-size: 1.25rem;
  font-weight: 800;
  color: #fff;
}

.hud-streak {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  font-family: var(--display);
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--gold);
}

/* Arena Card */
.arena-card {
  background: var(--surface);
  border: 2px solid var(--line);
  border-radius: 22px;
  padding: 1.6rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.2rem;
  box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.visual-panel {
  position: relative;
  width: 100%;
  max-width: 520px;
  background: radial-gradient(circle at 50% 50%, #172a4c, #0a1324);
  border: 2px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
  box-shadow: inset 0 2px 16px rgba(0,0,0,0.5);
  display: flex;
  flex-direction: column;
  align-items: center;
}

canvas {
  width: 100%;
  max-height: 320px;
  display: block;
  cursor: grab;
}

canvas:active {
  cursor: grabbing;
}

.shape-hint-badge {
  position: absolute;
  bottom: 8px;
  background: rgba(9, 14, 26, 0.75);
  backdrop-filter: blur(4px);
  padding: 0.25rem 0.8rem;
  border-radius: 999px;
  font-size: 0.75rem;
  color: var(--muted);
  border: 1px solid var(--line);
}

/* Properties Panel */
.props-panel {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
  justify-content: center;
  width: 100%;
}

.prop-chip {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 0.5rem 1rem;
  border-radius: 12px;
  font-size: 0.9rem;
  color: #cbd5e1;
}

.prop-chip b {
  color: var(--cyan);
  font-family: var(--display);
  font-size: 1.1rem;
}

/* Choices Grid */
.choices-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.9rem;
  width: 100%;
  max-width: 680px;
}

.choice-btn {
  font-family: var(--body);
  font-size: 1.1rem;
  font-weight: 700;
  padding: 1.1rem 1.4rem;
  background: var(--panel);
  border: 2px solid var(--line);
  border-radius: 14px;
  color: #fff;
  cursor: pointer;
  text-align: left;
  transition: all 0.18s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.choice-btn:hover {
  transform: translateY(-3px) scale(1.02);
  border-color: var(--cyan);
  background: #23345a;
}

.choice-btn.correct {
  background: #064e3b;
  border-color: var(--teal);
  color: #a7f3d0;
}

.choice-btn.wrong {
  background: #7f1d1d;
  border-color: #ef4444;
  color: #fecaca;
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(9, 14, 26, 0.85);
  backdrop-filter: blur(6px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 1rem;
}

.modal-overlay.active {
  display: flex;
}

.modal-card {
  background: var(--surface);
  border: 2px solid var(--cyan);
  border-radius: 22px;
  padding: 2.2rem 2rem;
  max-width: 480px;
  width: 100%;
  text-align: center;
  box-shadow: 0 20px 50px rgba(0,0,0,0.6);
}

.modal-card h2 {
  font-family: var(--display);
  font-size: 1.7rem;
  font-weight: 800;
  color: #fff;
}

.modal-card p {
  color: var(--muted);
  margin: 0.6rem 0 1.2rem;
}

.badge-award {
  background: var(--panel);
  border: 2px solid var(--gold);
  padding: 0.8rem 1.4rem;
  border-radius: 12px;
  font-family: var(--display);
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--gold);
  margin-bottom: 1.5rem;
}

.modal-btn {
  font-family: var(--body);
  font-size: 1rem;
  font-weight: 700;
  padding: 0.8rem 1.8rem;
  border-radius: 999px;
  background: linear-gradient(135deg, #0284c7, #0369a1);
  color: #fff;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 15px rgba(2, 132, 199, 0.4);
}