/* ============================================
   테마 시스템 - 다크모드 & 컬러 테마
   ============================================ */

:root {
    /* 라이트 모드 - 청소년 취향 그라데이션 */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --success-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --warm-gradient: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    
    /* 기본 색상 */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-card: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    
    /* 액센트 색상 */
    --accent-purple: #8b5cf6;
    --accent-pink: #ec4899;
    --accent-blue: #3b82f6;
    --accent-cyan: #06b6d4;
    --accent-orange: #f97316;
    --accent-green: #10b981;
    
    /* 그림자 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
    --shadow-glow: 0 0 20px rgba(139, 92, 246, 0.3);
    
    /* 애니메이션 속도 */
    --transition-fast: 0.2s;
    --transition-normal: 0.3s;
    --transition-slow: 0.5s;
}

/* 다크 모드 */
[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 30px rgba(139, 92, 246, 0.5);
}

/* 컬러 테마 - 민트 */
[data-color-theme="mint"] {
    --primary-gradient: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
    --accent-purple: #10b981;
    --accent-pink: #06b6d4;
}

/* 컬러 테마 - 선셋 */
[data-color-theme="sunset"] {
    --primary-gradient: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    --accent-purple: #f97316;
    --accent-pink: #ec4899;
}

/* 컬러 테마 - 오션 */
[data-color-theme="ocean"] {
    --primary-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --accent-purple: #0ea5e9;
    --accent-pink: #8b5cf6;
}

/* 컬러 테마 - 체리 */
[data-color-theme="cherry"] {
    --primary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --accent-purple: #ec4899;
    --accent-pink: #f43f5e;
}

/* 기본 스타일 적용 */
body {
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: background var(--transition-normal), color var(--transition-normal);
}

.card,
.stat-card,
.cute-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.card:hover,
.cute-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

/* 그라데이션 카드 */
.gradient-card {
    background: var(--primary-gradient);
    color: white;
    border: none;
}

.gradient-card.secondary {
    background: var(--secondary-gradient);
}

.gradient-card.success {
    background: var(--success-gradient);
}

.gradient-card.warm {
    background: var(--warm-gradient);
}

/* 테마 토글 버튼 */
.theme-controls {
    position: fixed;
    top: 80px;
    right: 20px;
    z-index: 1001;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.theme-toggle-btn {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.theme-toggle-btn:hover {
    transform: scale(1.1) rotate(15deg);
    box-shadow: var(--shadow-glow);
}

.theme-toggle-btn:active {
    transform: scale(0.95);
}

/* 컬러 테마 선택기 */
.color-theme-picker {
    position: fixed;
    top: 160px;
    right: 20px;
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: 16px;
    padding: 16px;
    box-shadow: var(--shadow-lg);
    z-index: 1001;
    display: none;
}

.color-theme-picker.active {
    display: block;
    animation: scaleIn 0.3s ease;
}

.color-theme-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.color-option {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    cursor: pointer;
    border: 3px solid transparent;
    transition: all var(--transition-fast);
    position: relative;
}

.color-option:hover {
    transform: scale(1.2);
}

.color-option.active {
    border-color: var(--text-primary);
}

.color-option.active::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 20px;
    font-weight: bold;
    text-shadow: 0 0 4px rgba(0, 0, 0, 0.5);
}

.color-option.purple { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
.color-option.mint { background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%); }
.color-option.sunset { background: linear-gradient(135deg, #fa709a 0%, #fee140 100%); }
.color-option.ocean { background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%); }
.color-option.cherry { background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%); }

/* 글래스모피즘 효과 */
.glass-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] .glass-card {
    background: rgba(30, 41, 59, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* 모바일 반응형 */
@media (max-width: 768px) {
    .theme-controls {
        top: 70px;
        right: 12px;
    }
    
    .theme-toggle-btn {
        width: 48px;
        height: 48px;
        font-size: 20px;
    }
    
    .color-theme-picker {
        right: 12px;
        padding: 12px;
    }
    
    .color-option {
        width: 40px;
        height: 40px;
    }
}

/* 네온 효과 (선택사항) */
.neon-text {
    text-shadow: 
        0 0 5px var(--accent-purple),
        0 0 10px var(--accent-purple),
        0 0 20px var(--accent-purple);
}

[data-theme="dark"] .neon-text {
    text-shadow: 
        0 0 10px var(--accent-purple),
        0 0 20px var(--accent-purple),
        0 0 40px var(--accent-purple),
        0 0 80px var(--accent-purple);
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}