:root {
  --bg: #fdf6ec;
  --surface: #ffffff;
  --text: #2d2a26;
  --text-muted: #706a61;
  --primary: #e8734a;
  --primary-dark: #c85a34;
  --accent-tile: #ffd166;
  --tile-border: #e4dcd0;
  --shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
  --radius: 16px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  padding: 24px;
}

.app {
  width: 100%;
  max-width: 480px;
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px 24px 32px;
  text-align: center;
}

h1 {
  margin: 0 0 24px;
  font-size: 1.6rem;
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-bottom: 28px;
}

.start-btn {
  font-size: 1.1rem;
  font-weight: 600;
  padding: 14px 24px;
  border: none;
  border-radius: 999px;
  background: var(--primary);
  color: white;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.1s ease;
}

.start-btn:hover {
  background: var(--primary-dark);
}

.start-btn:active {
  transform: scale(0.97);
}

.start-btn.running {
  background: var(--text);
}

.control {
  display: flex;
  flex-direction: column;
  gap: 6px;
  text-align: left;
}

.control span {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.bpm-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.bpm-row input[type="range"] {
  flex: 1;
}

.bpm-row input[type="number"] {
  width: 64px;
  padding: 6px 8px;
  border-radius: 8px;
  border: 1px solid var(--tile-border);
  font-size: 1rem;
  text-align: center;
}

select {
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--tile-border);
  background: var(--surface);
  font-size: 1rem;
}

.beat-tiles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(90px, 1fr));
  gap: 12px;
}

.beat-tile {
  border: 2px solid var(--tile-border);
  border-radius: var(--radius);
  padding: 14px 8px 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  background: var(--surface);
  transition: border-color 0.1s ease, background 0.1s ease;
}

.beat-tile.accent {
  border-color: var(--primary);
}

.beat-tile .beat-number {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
}

.beat-tile.accent .beat-number {
  color: var(--primary);
}

.beat-tile .beat-emoji {
  font-size: 2.2rem;
  line-height: 1;
}

.beat-tile select {
  width: 100%;
  padding: 6px 4px;
  font-size: 0.85rem;
  border-radius: 8px;
}

.beat-tile.beat-active {
  background: var(--accent-tile);
  border-color: var(--accent-tile);
  animation: beat-bounce 0.22s ease-out;
}

@keyframes beat-bounce {
  0% {
    transform: scale(1);
  }
  35% {
    transform: scale(1.18);
  }
  100% {
    transform: scale(1);
  }
}

.status {
  margin: 24px 0 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}