:root {
  --bg: #f5f3ff;
  --text: #4c3d6b;
  --header-bg: #ffffff;
  --border: #ddd6fe;
  --accent: #a78bfa;
  --accent-dark: #8b5cf6;
  --error: #ef4444;

  --color-0: #ddd6fe;
  --color-1: #bfdbfe;
  --color-2: #fbcfe8;
  --color-3: #bbf7d0;
  --color-4: #fde68a;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

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

header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  background: var(--header-bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
}

#search-input {
  flex: 1;
  height: 38px;
  border-radius: 8px;
  border: 1px solid var(--border);
  padding: 0 14px;
  font-size: 15px;
  color: var(--text);
  background: var(--bg);
}

#search-input:focus {
  outline: 2px solid var(--accent);
}

.link-btn {
  background: none;
  border: none;
  color: var(--text);
  opacity: 0.7;
  font-size: 14px;
  cursor: pointer;
  text-decoration: underline;
  white-space: nowrap;
}

.link-btn:hover {
  opacity: 1;
}

.stop-btn {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 0 20px;
  height: 38px;
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  white-space: nowrap;
}

.stop-btn:hover {
  background: var(--accent-dark);
}

main {
  padding: 24px;
  max-width: 1100px;
  margin: 0 auto;
}

.message {
  text-align: center;
  font-size: 16px;
  opacity: 0.7;
  margin-top: 40px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 12px;
  margin-top: 20px;
}

.sound-btn {
  border: none;
  border-radius: 12px;
  padding: 18px 10px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  min-height: 64px;
  transition: transform 0.1s ease, box-shadow 0.15s ease;
}

.sound-btn:hover {
  transform: translateY(-2px);
}

.sound-btn.color-0 { background: var(--color-0); }
.sound-btn.color-1 { background: var(--color-1); }
.sound-btn.color-2 { background: var(--color-2); }
.sound-btn.color-3 { background: var(--color-3); }
.sound-btn.color-4 { background: var(--color-4); }

.sound-btn.is-active {
  box-shadow: 0 0 0 3px var(--accent-dark);
  animation: pulse 1.2s ease-in-out infinite;
}

.sound-btn.is-error {
  box-shadow: 0 0 0 3px var(--error);
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 3px var(--accent-dark); }
  50% { box-shadow: 0 0 0 5px var(--accent-dark); }
}