:root {
  color-scheme: light;
  --bg: #fff7f0;
  --fg: #2b1d14;
  --accent: #ff6f91;
  --accent-dark: #e34d72;
  --card: #ffffff;
  --border: #f0ddd0;
}

* {
  box-sizing: border-box;
}

.splash-overlay {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #fff;
  opacity: 1;
  transition: opacity 0.5s ease;
}

.splash-overlay.is-hidden {
  opacity: 0;
  pointer-events: none;
}

.splash-overlay img {
  width: min(60vw, 260px);
  height: auto;
  animation: splash-logo-in 0.8s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

@keyframes splash-logo-in {
  0% {
    transform: scale(0.3) rotate(-15deg);
    opacity: 0;
  }
  50% {
    transform: scale(1.15) rotate(8deg);
    opacity: 1;
  }
  70% {
    transform: scale(0.95) rotate(-4deg);
  }
  85% {
    transform: scale(1.05) rotate(2deg);
  }
  100% {
    transform: scale(1) rotate(0deg);
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: "Hiragino Sans", "Helvetica Neue", Arial, sans-serif;
}

.page {
  max-width: 480px;
  margin: 0 auto;
  padding: 24px 16px 64px;
}

.page-header h1 {
  margin: 0 0 4px;
  font-size: 28px;
}

.page-header p {
  margin: 0 0 24px;
  color: #6b5648;
}

.cake-form,
.result {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
}

.field {
  display: block;
  margin-bottom: 16px;
}

.field span {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 6px;
}

.field input,
.field textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 16px;
  font-family: inherit;
}

.hint {
  display: block;
  font-size: 12px;
  color: #8a7668;
  margin: 4px 0 0;
}

.bgm-picker {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.bgm-row {
  display: flex;
  align-items: stretch;
  gap: 8px;
}

.bgm-play {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  flex: none;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  color: var(--fg);
  cursor: pointer;
}

.bgm-play-icon {
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 6px 0 6px 10px;
  border-color: transparent transparent transparent currentColor;
  margin-left: 2px;
}

.bgm-play.is-playing {
  border-color: var(--accent);
  color: var(--accent-dark);
}

.bgm-play.is-playing .bgm-play-icon {
  width: 10px;
  height: 10px;
  margin-left: 0;
  border-style: none;
  background: currentColor;
  border-radius: 2px;
}

.bgm-select {
  flex: 1;
  padding: 10px 4px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  color: var(--fg);
  font-size: 13px;
  cursor: pointer;
  text-align: left;
}

.bgm-select.is-selected {
  border-color: var(--accent);
  background: #fff1f5;
  color: var(--accent-dark);
  font-weight: 700;
}

.notice {
  font-size: 12px;
  color: #8a5a3f;
  background: #fff1e6;
  border-radius: 10px;
  padding: 10px 12px;
  margin: 0 0 16px;
}

.primary-button {
  width: 100%;
  padding: 14px;
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  background: var(--accent);
  border: none;
  border-radius: 999px;
  cursor: pointer;
}

.primary-button:active {
  background: var(--accent-dark);
}

.result {
  margin-top: 20px;
}

.result h2 {
  margin: 0 0 12px;
  font-size: 18px;
}

.share-url {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 13px;
  margin-bottom: 12px;
}

.result-actions {
  display: flex;
  gap: 8px;
}

.result-actions button {
  flex: 1;
  padding: 10px;
  border-radius: 10px;
  border: 1px solid var(--accent);
  background: #fff;
  color: var(--accent-dark);
  font-weight: 600;
  cursor: pointer;
}