:root {
  /* Light Mode Variables */
  --bg-color: #f5f5f5;
  --text-color: #333;
  --header-bg: #333;
  --header-text: #fff;
  --card-bg: #ffffff;
  --card-shadow: rgba(0, 0, 0, 0.1);
  --footer-text: #777;
  --accent-color: #fbc02d;
}

[data-theme="dark"] {
  /* Dark Mode Variables */
  --bg-color: #1a1a1a;
  --text-color: #e0e0e0;
  --header-bg: #000;
  --header-text: #fbc02d;
  --card-bg: #2d2d2d;
  --card-shadow: rgba(0, 0, 0, 0.5);
  --footer-text: #aaa;
}

body {
  font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, 'Helvetica Neue', 'Segoe UI', 'Apple SD Gothic Neo', 'Noto Sans KR', 'Malgun Gothic', 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  text-align: center;
  margin: 0;
  padding: 0;
  transition: background-color 0.3s ease, color 0.3s ease;
}

header {
  background-color: var(--header-bg);
  color: var(--header-text);
  padding: 20px;
  position: relative;
  transition: background-color 0.3s ease;
}

.container {
  padding: 40px;
}

.character-img {
  width: 250px;
  border-radius: 20px;
  margin: 20px 0;
  box-shadow: 0 4px 8px var(--card-shadow);
}

.card {
  background: var(--card-bg);
  padding: 30px;
  border-radius: 20px;
  max-width: 500px;
  margin: 0 auto;
  box-shadow: 0 10px 30px var(--card-shadow);
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

footer {
  margin-top: 40px;
  padding: 20px;
  font-size: 14px;
  color: var(--footer-text);
}

/* Theme Toggle Button */
.theme-toggle {
  position: absolute;
  top: 20px;
  right: 20px;
  background: none;
  border: 2px solid var(--header-text);
  color: var(--header-text);
  padding: 8px 16px;
  border-radius: 20px;
  cursor: pointer;
  font-weight: bold;
  transition: all 0.3s ease;
}

.theme-toggle:hover {
  background-color: var(--header-text);
  color: var(--header-bg);
}