:root {
  --bg-color: #f8f9fa;
  --text-color: #212529;
  --primary-color: #4dabf7;
  --secondary-color: #ff922b;
  --card-bg: #ffffff;
  --border-color: #dee2e6;
  --slider-bg: #e9ecef;
}

[data-theme="dark"] {
  --bg-color: #1a1a1a;
  --text-color: #e9ecef;
  --primary-color: #339af0;
  --secondary-color: #ffa94d;
  --card-bg: #2d2d2d;
  --border-color: #404040;
  --slider-bg: #404040;
}

body {
  font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  margin: 0;
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: background-color 0.3s, color 0.3s;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

.container {
  width: 90%;
  max-width: 600px;
  background-color: var(--card-bg);
  padding: 40px;
  border-radius: 20px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.05);
  text-align: center;
  transition: background-color 0.3s;
  position: relative;
}

h1 { margin-bottom: 10px; font-size: 2rem; }
p.desc { color: #868e96; margin-bottom: 30px; }

.step { display: none; }
.step.active { display: block; animation: fadeIn 0.5s ease-in-out; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.trait-group {
  margin-bottom: 25px;
  text-align: left;
}

.trait-label {
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
  font-weight: 600;
}

input[type="range"] {
  width: 100%;
  height: 8px;
  background: var(--slider-bg);
  border-radius: 5px;
  outline: none;
  -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  background: var(--primary-color);
  border-radius: 50%;
  cursor: pointer;
  transition: transform 0.2s;
}

button {
  padding: 12px 30px;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: 10px;
  background-color: var(--primary-color);
  color: white;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.2s;
  margin-top: 20px;
}

button:hover { opacity: 0.9; transform: translateY(-2px); }
button.secondary { background-color: var(--secondary-color); }

#theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  background: var(--card-bg);
  color: var(--text-color);
  border: 1px solid var(--border-color);
  padding: 8px 15px;
  border-radius: 20px;
  cursor: pointer;
}

canvas {
  margin-top: 20px;
  max-width: 100%;
}

.result-summary {
  margin-top: 25px;
  padding: 20px;
  background: var(--slider-bg);
  border-radius: 12px;
  font-size: 0.95rem;
  line-height: 1.6;
}