* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Noto Sans JP', sans-serif;
  background: #000;
  color: #fff;
  height: 100vh;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  touch-action: manipulation;
}

.container {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  position: relative;
}

.idea-display {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: 600px;
}

.idea-text {
  font-size: clamp(1.5rem, 5vw, 2.5rem);
  font-weight: 700;
  text-align: center;
  line-height: 1.4;
  opacity: 0;
  animation: fadeIn 0.3s ease forwards;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.controls {
  display: flex;
  gap: 1rem;
  margin-bottom: 3rem;
}

.generate-btn,
.auto-btn {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  border: none;
  background: #fff;
  color: #000;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  box-shadow: 0 4px 20px rgba(255, 255, 255, 0.3);
}

.auto-btn.active {
  background: #000;
  color: #fff;
  border: 2px solid #fff;
}

.generate-btn:active,
.auto-btn:active {
  transform: scale(0.95);
  box-shadow: 0 2px 10px rgba(255, 255, 255, 0.2);
}

@media (hover: hover) {
  .generate-btn:hover,
  .auto-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 30px rgba(255, 255, 255, 0.4);
  }
}