:root {
  color-scheme: dark;
  --bg: #14181f;
  --panel: #1b2129;
  --border: #2a323e;
  --text: #e7ebf0;
  --muted: #8a94a3;
  --accent: #5fb3a3;
  --accent-2: #f4a261;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, 'Segoe UI', sans-serif;
  min-height: 100vh;
}

#app {
  max-width: 900px;
  margin: 0 auto;
  padding: 24px 16px 60px;
}

.app-header h1 {
  font-size: 2rem;
  margin-bottom: 4px;
}

.tagline {
  color: var(--muted);
  max-width: 60ch;
  line-height: 1.5;
}

.level-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
  margin-top: 24px;
}

.level-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  text-align: left;
  color: var(--text);
  cursor: pointer;
  transition: border-color 0.15s, transform 0.1s;
}

.level-card:hover:not(.locked) {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.level-card.locked {
  opacity: 0.45;
  cursor: not-allowed;
}

.level-card h3 { margin: 0 0 6px; font-size: 1.05rem; }
.card-sub { margin: 0; color: var(--muted); font-size: 0.8rem; letter-spacing: 0.04em; }
.card-score { margin: 8px 0 0; color: var(--accent); font-size: 0.85rem; }

.btn {
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 18px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.95rem;
}

.btn:hover { border-color: var(--accent); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }

.btn.primary {
  background: var(--accent);
  color: #0f1a17;
  border-color: var(--accent);
  font-weight: 600;
}

.btn.back { margin-bottom: 16px; }

.level-header h2 { margin-bottom: 6px; }
.intro-text, .outro-text {
  color: var(--muted);
  line-height: 1.55;
  max-width: 70ch;
}

.palette {
  display: flex;
  gap: 8px;
  margin: 12px 0;
}

.swatch {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  border: 3px solid transparent;
  cursor: pointer;
}
.swatch.active { border-color: var(--text); }

.grid-canvas {
  display: block;
  width: 100%;
  max-width: 560px;
  height: auto;
  border-radius: 8px;
  margin: 16px 0;
  cursor: pointer;
  border: 1px solid var(--border);
}

.status-bar {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 12px;
}

.action-bar { display: flex; gap: 10px; margin-bottom: 16px; }

.preview-wrap {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 16px;
}

.predict-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
  flex-wrap: wrap;
}

.predict-row select {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 8px;
}

.result-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px 20px;
  margin-top: 8px;
}

.reason-list {
  margin: 12px 0;
  padding-left: 20px;
  color: var(--muted);
  line-height: 1.6;
  font-size: 0.92rem;
}

.muted { color: var(--muted); }

.quiz-q {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
  margin-bottom: 14px;
}

.quiz-options {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 10px;
}

.quiz-opt.active {
  background: var(--accent);
  color: #0f1a17;
  border-color: var(--accent);
}