:root {
  --bg: #FAF7F2;
  --ink: #2A2A2A;
  --muted: #6B6B6B;
  --accent: #4D6FA8;
  --accent-strong: #2E4F86;
  --card: #FFFFFF;
  --line: #DCD8D0;
  --radius: 14px;
  --shadow: 0 2px 10px rgba(0,0,0,0.06);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: 'Quicksand', system-ui, -apple-system, Segoe UI, sans-serif;
}

header {
  text-align: center;
  padding: 32px 16px 8px;
}

header h1 {
  margin: 0;
  font-weight: 700;
  letter-spacing: 0.5px;
  font-size: 28px;
}

.subtitle {
  color: var(--muted);
  margin: 6px 0 0;
  font-size: 14px;
}

main {
  max-width: 920px;
  margin: 0 auto;
  padding: 24px 16px 60px;
}

.slots {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 28px;
}

.slot {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  align-items: stretch;
  padding: 12px;
}

.slot-canvas-wrap {
  display: flex;
  justify-content: center;
  margin-bottom: 10px;
}

.slot canvas {
  width: 170px;
  height: auto;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: white;
  display: block;
}

.slot-controls {
  display: flex;
  gap: 6px;
  justify-content: center;
}

.slot-btn {
  flex: 1;
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  background: #F2EEE6;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 8px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.slot-btn:hover { background: #E8E2D4; }

.slot-btn.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent-strong);
}

.actions {
  display: flex;
  gap: 12px;
  justify-content: center;
}

.btn {
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  background: white;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 18px;
  cursor: pointer;
  transition: background 0.15s, transform 0.05s;
}

.btn:hover { background: #F2EEE6; }
.btn:active { transform: translateY(1px); }

.btn.primary {
  background: var(--accent);
  color: white;
  border-color: var(--accent-strong);
}

.btn.primary:hover { background: var(--accent-strong); }

.hint {
  margin-top: 28px;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
}

.hint p { margin: 0; }

@media (max-width: 720px) {
  .slots { grid-template-columns: 1fr; }
  .slot canvas { width: 200px; }
}