/* 테마 변수 정의 */
:root {
  /* 라이트 모드 */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-glass: rgba(255, 255, 255, 0.1);
  --bg-glass-hover: rgba(255, 255, 255, 0.2);
  --text-primary: #1a1a1a;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;
  --border-color: rgba(255, 255, 255, 0.2);
  --shadow-color: rgba(0, 0, 0, 0.1);
  --accent-color: #3b82f6;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --error-color: #ef4444;
  --cursor-color: rgba(0, 0, 0, 0.35);
}

/* 다크 모드 */
[data-theme="dark"] {
  --bg-primary: #0a0a0a;
  --bg-secondary: #1a1a1a;
  --bg-glass: rgba(0, 0, 0, 0.3);
  --bg-glass-hover: rgba(0, 0, 0, 0.5);
  --text-primary: #ffffff;
  --text-secondary: #d1d5db;
  --text-muted: #9ca3af;
  --border-color: rgba(255, 255, 255, 0.1);
  --shadow-color: rgba(0, 0, 0, 0.3);
  --accent-color: #60a5fa;
  --success-color: #34d399;
  --warning-color: #fbbf24;
  --error-color: #f87171;
  --cursor-color: rgba(255,255,255,.35);
}

/* 시스템 테마 감지 */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --bg-glass: rgba(0, 0, 0, 0.3);
    --bg-glass-hover: rgba(0, 0, 0, 0.5);
    --text-primary: #ffffff;
    --text-secondary: #d1d5db;
    --text-muted: #9ca3af;
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-color: rgba(0, 0, 0, 0.3);
    --accent-color: #60a5fa;
    --success-color: #34d399;
    --warning-color: #fbbf24;
    --error-color: #f87171;
  }
}

/* 테마 토글 버튼 */
.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  width: 50px;
  height: 50px;
  border: none;
  border-radius: 50%;
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  transition: all 0.3s ease;
  z-index: 1000;
}

.theme-toggle:hover {
  background: var(--bg-glass-hover);
  transform: scale(1.1);
}

.theme-toggle .dark-icon {
  display: none;
}

[data-theme="dark"] .theme-toggle .light-icon {
  display: none;
}

[data-theme="dark"] .theme-toggle .dark-icon {
  display: block;
}

/* 테마 전환 애니메이션 */
* {
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}