:root {
  --cb-bg: #0f1720;
  --cb-surface: #182634;
  --cb-surface-2: #223347;
  --cb-tile-border: var(--cb-surface-2);
  --cb-text: #eef3f8;
  --cb-text-dim: #9fb0c0;
  --cb-accent: #ffb84d;
  --cb-accent-text: #1a1300;
  --cb-marked: #2f9e6e;
  --cb-danger: #e2604f;
  --cb-radius: 14px;
}

@media (prefers-color-scheme: light) {
  :root {
    --cb-bg: #f4f6f9;
    --cb-surface: #ffffff;
    --cb-surface-2: #eef2f6;
    /* Distinct from --cb-surface-2 on purpose: that token sits too close to
       both white tiles and the page background to read as a border there. */
    --cb-tile-border: #d3dce4;
    --cb-text: #16212c;
    --cb-text-dim: #5b6b7a;
    --cb-accent: #e08b1f;
    --cb-accent-text: #ffffff;
    --cb-marked: #1f8f5f;
    --cb-danger: #c94a3a;
  }
}

* { box-sizing: border-box; }

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

.cb-screen { display: none; }
.cb-screen.cb-visible { display: block; }

/* --- Entry screen --- */

#screenEntry {
  display: none;
  min-height: 100vh;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
#screenEntry.cb-visible { display: flex; }

.cb-card {
  width: 100%;
  max-width: 420px;
  background: var(--cb-surface);
  border-radius: var(--cb-radius);
  padding: 28px 24px;
}

.cb-card h1 { margin: 0 0 4px; font-size: 1.6rem; }
.cb-tagline { margin: 0 0 24px; color: var(--cb-text-dim); }

.cb-field {
  display: block;
  margin-bottom: 18px;
}
.cb-field > span:first-child { display: block; font-weight: 600; margin-bottom: 2px; }
.cb-hint { display: block; font-size: 0.8rem; color: var(--cb-text-dim); margin-bottom: 8px; }

.cb-field input[type="text"],
.cb-field input[type="number"],
.cb-field select {
  width: 100%;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--cb-tile-border);
  background: var(--cb-surface-2);
  color: var(--cb-text);
  font-size: 1rem;
}

.cb-seed-row { display: flex; gap: 8px; }
.cb-seed-row input { flex: 1; }

.cb-boardset-actions, .cb-boardset-create {
  display: flex;
  gap: 8px;
  margin: -8px 0 18px;
}
.cb-boardset-actions button, .cb-boardset-create button { flex: 1; font-size: 0.85rem; padding: 8px 6px; }

.cb-btn-primary {
  width: 100%;
  padding: 14px;
  border: none;
  border-radius: 10px;
  background: var(--cb-accent);
  color: var(--cb-accent-text);
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
}

.cb-btn-ghost {
  padding: 10px 14px;
  border: 1px solid var(--cb-tile-border);
  border-radius: 10px;
  background: transparent;
  color: var(--cb-text);
  cursor: pointer;
  font-size: 0.95rem;
}

.cb-btn-danger { color: var(--cb-danger); border-color: var(--cb-danger); }

.cb-footnote {
  margin: 20px 0 0;
  font-size: 0.75rem;
  color: var(--cb-text-dim);
  text-align: center;
}

/* --- Board screen --- */

#screenBoard { padding: 16px; max-width: 520px; margin: 0 auto; }

.cb-board-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}
.cb-board-seed, .cb-board-player, .cb-board-set { font-size: 0.85rem; color: var(--cb-text-dim); }
.cb-board-seed strong, .cb-board-player strong, .cb-board-set strong { color: var(--cb-text); }

.cb-score { text-align: right; }
.cb-score-value { font-size: 1.8rem; font-weight: 800; line-height: 1; color: var(--cb-accent); }
.cb-score-label { font-size: 0.75rem; color: var(--cb-text-dim); }

.cb-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}

.cb-tile {
  aspect-ratio: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  border-radius: 12px;
  border: 1px solid var(--cb-tile-border);
  background: var(--cb-surface);
  color: var(--cb-text);
  cursor: pointer;
  padding: 4px;
  text-align: center;
  transition: transform 0.1s ease, background 0.15s ease, box-shadow 0.15s ease;
}
.cb-tile:active { transform: scale(0.96); }

.cb-tile-icon { font-size: 3.4rem; line-height: 1; }
.cb-tile-name { font-size: 0.68rem; line-height: 1.1; }
.cb-tile-points { font-size: 0.62rem; color: var(--cb-text-dim); }

.cb-tile.cb-marked {
  background: var(--cb-marked);
  border-color: var(--cb-marked);
  color: #fff;
}
.cb-tile.cb-marked .cb-tile-points { color: rgba(255,255,255,0.85); }

.cb-tile.cb-glow {
  box-shadow: 0 0 0 3px var(--cb-accent), 0 0 18px 2px var(--cb-accent);
}

.cb-board-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px;
  margin-top: 18px;
}
.cb-board-footer button { flex: 1 1 auto; min-width: 120px; font-size: 0.85rem; }

.cb-toast {
  position: fixed;
  left: 50%;
  bottom: -80px;
  transform: translateX(-50%);
  background: var(--cb-accent);
  color: var(--cb-accent-text);
  font-weight: 700;
  padding: 14px 22px;
  border-radius: 999px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.3);
  transition: bottom 0.3s ease;
}
.cb-toast.cb-toast-visible { bottom: 24px; }

/* --- Editor screen --- */

#screenEditor { padding: 24px 16px 60px; }

.cb-editor-card { max-width: 480px; margin: 0 auto; }

.cb-editor-rows {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 12px 0 20px;
}

.cb-editor-row {
  display: grid;
  grid-template-columns: 48px 1fr 64px;
  gap: 8px;
  align-items: center;
}

.cb-editor-icon-btn {
  width: 48px;
  height: 48px;
  font-size: 1.5rem;
  border-radius: 10px;
  border: 1px solid var(--cb-tile-border);
  background: var(--cb-surface-2);
  cursor: pointer;
}

.cb-editor-name-input, .cb-editor-points-input {
  padding: 10px;
  border-radius: 10px;
  border: 1px solid var(--cb-tile-border);
  background: var(--cb-surface-2);
  color: var(--cb-text);
  font-size: 0.9rem;
  width: 100%;
}
.cb-editor-points-input { text-align: center; }

.cb-editor-footer {
  display: flex;
  gap: 10px;
}
.cb-editor-footer button { flex: 1; }

/* --- Icon picker overlay --- */

.cb-icon-picker {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  align-items: center;
  justify-content: center;
  padding: 24px;
  z-index: 100;
}
.cb-icon-picker.cb-visible { display: flex; }

.cb-icon-picker-inner {
  background: var(--cb-surface);
  border-radius: var(--cb-radius);
  padding: 16px;
  max-width: 420px;
  width: 100%;
  max-height: 70vh;
  display: flex;
  flex-direction: column;
}

.cb-icon-picker-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 700;
  margin-bottom: 10px;
}
.cb-icon-picker-header button { padding: 4px 10px; }

.cb-icon-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 6px;
  overflow-y: auto;
}

.cb-icon-choice {
  aspect-ratio: 1;
  font-size: 1.5rem;
  border-radius: 8px;
  border: 1px solid var(--cb-tile-border);
  background: var(--cb-surface-2);
  cursor: pointer;
}
.cb-icon-choice:active { transform: scale(0.92); }