/* ============================================================
   This Car - 디자인 시스템 변수
   ============================================================
   모든 페이지에서 공통으로 사용하는 디자인 토큰
   ============================================================ */

:root {
    /* ========================================
       색상 시스템 (Color System)
       ======================================== */
    
    /* Primary - 브랜드 메인 컬러 */
    --color-primary: #5B4EE8;
    --color-primary-light: #7B6FFF;
    --color-primary-dark: #4A3DD6;
    --color-primary-50: #EEEDFC;
    --color-primary-100: #D4D1F9;
    --color-primary-200: #B5AFF5;
    
    /* Secondary - 보조 컬러 */
    --color-secondary: #6C5CE7;
    --color-secondary-light: #A29BFE;
    
    /* Accent - 강조 컬러 */
    --color-accent: #00D9A5;
    --color-accent-light: #55EFC4;
    --color-accent-dark: #00B894;
    
    /* Semantic Colors - 의미 색상 */
    --color-success: #00D68F;
    --color-success-light: #E6FBF4;
    --color-warning: #FFAA00;
    --color-warning-light: #FFF8E6;
    --color-error: #FF4757;
    --color-error-light: #FFE6E9;
    --color-info: #3B82F6;
    --color-info-light: #EBF3FF;
    
    /* Neutral Colors - 중성 색상 */
    --color-gray-50: #F9FAFB;
    --color-gray-100: #F3F4F6;
    --color-gray-200: #E5E7EB;
    --color-gray-300: #D1D5DB;
    --color-gray-400: #9CA3AF;
    --color-gray-500: #6B7280;
    --color-gray-600: #4B5563;
    --color-gray-700: #374151;
    --color-gray-800: #1F2937;
    --color-gray-900: #111827;
    
    /* Background Colors */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F8F9FC;
    --bg-tertiary: #F1F3F9;
    --bg-overlay: rgba(0, 0, 0, 0.5);
    --bg-overlay-light: rgba(0, 0, 0, 0.3);
    
    /* Text Colors */
    --text-primary: #1A1D26;
    --text-secondary: #4A5568;
    --text-tertiary: #718096;
    --text-muted: #A0AEC0;
    --text-inverse: #FFFFFF;
    
    /* Border Colors */
    --border-light: #E8ECF4;
    --border-default: #D4DAE6;
    --border-strong: #B8C2D6;
    
    /* ========================================
       그라데이션 (Gradients)
       ======================================== */
    --gradient-primary: linear-gradient(135deg, #5B4EE8 0%, #8B5CF6 100%);
    --gradient-primary-hover: linear-gradient(135deg, #4A3DD6 0%, #7C4DDB 100%);
    --gradient-accent: linear-gradient(135deg, #00D9A5 0%, #00B894 100%);
    --gradient-warning: linear-gradient(135deg, #FF9F43 0%, #F5A623 100%);
    --gradient-danger: linear-gradient(135deg, #FF4757 0%, #E84118 100%);
    --gradient-dark: linear-gradient(135deg, #2D3748 0%, #1A202C 100%);
    --gradient-card: linear-gradient(180deg, #FFFFFF 0%, #F8FAFC 100%);
    
    /* ========================================
       타이포그래피 (Typography)
       ======================================== */
    --font-family-base: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-family-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    
    /* Font Sizes */
    --font-size-xs: 0.75rem;     /* 12px */
    --font-size-sm: 0.8125rem;   /* 13px */
    --font-size-base: 0.875rem;  /* 14px */
    --font-size-md: 0.9375rem;   /* 15px */
    --font-size-lg: 1rem;        /* 16px */
    --font-size-xl: 1.125rem;    /* 18px */
    --font-size-2xl: 1.25rem;    /* 20px */
    --font-size-3xl: 1.5rem;     /* 24px */
    --font-size-4xl: 1.875rem;   /* 30px */
    --font-size-5xl: 2.25rem;    /* 36px */
    --font-size-6xl: 3rem;       /* 48px */
    
    /* Font Weights */
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;
    
    /* Line Heights */
    --line-height-tight: 1.25;
    --line-height-snug: 1.375;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.625;
    --line-height-loose: 2;
    
    /* Letter Spacing */
    --letter-spacing-tight: -0.025em;
    --letter-spacing-normal: 0;
    --letter-spacing-wide: 0.025em;
    
    /* ========================================
       간격 시스템 (Spacing)
       ======================================== */
    --space-0: 0;
    --space-1: 0.25rem;   /* 4px */
    --space-2: 0.5rem;    /* 8px */
    --space-3: 0.75rem;   /* 12px */
    --space-4: 1rem;      /* 16px */
    --space-5: 1.25rem;   /* 20px */
    --space-6: 1.5rem;    /* 24px */
    --space-8: 2rem;      /* 32px */
    --space-10: 2.5rem;   /* 40px */
    --space-12: 3rem;     /* 48px */
    --space-16: 4rem;     /* 64px */
    --space-20: 5rem;     /* 80px */
    --space-24: 6rem;     /* 96px */
    
    /* ========================================
       Border Radius
       ======================================== */
    --radius-xs: 4px;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 20px;
    --radius-3xl: 24px;
    --radius-full: 9999px;
    
    /* ========================================
       그림자 (Shadows)
       ======================================== */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);
    
    /* Colored Shadows */
    --shadow-primary: 0 4px 14px rgba(91, 78, 232, 0.25);
    --shadow-primary-lg: 0 8px 24px rgba(91, 78, 232, 0.3);
    --shadow-accent: 0 4px 14px rgba(0, 217, 165, 0.25);
    --shadow-error: 0 4px 14px rgba(255, 71, 87, 0.25);
    
    /* Card Shadows */
    --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.06), 0 4px 16px rgba(0, 0, 0, 0.04);
    --shadow-card-hover: 0 8px 24px rgba(0, 0, 0, 0.1), 0 4px 8px rgba(0, 0, 0, 0.06);
    
    /* ========================================
       트랜지션 (Transitions)
       ======================================== */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
    --transition-slower: 400ms ease;
    
    /* Easing */
    --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-out: cubic-bezier(0, 0, 0.2, 1);
    --ease-in: cubic-bezier(0.4, 0, 1, 1);
    --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
    
    /* ========================================
       Z-Index
       ======================================== */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-popover: 600;
    --z-tooltip: 700;
    --z-toast: 800;
    
    /* ========================================
       컨테이너 (Container)
       ======================================== */
    --container-sm: 640px;
    --container-md: 768px;
    --container-lg: 1024px;
    --container-xl: 1280px;
    --container-2xl: 1536px;
    --container-max: 1800px;
    
    /* ========================================
       반응형 브레이크포인트 참조 (Reference)
       ======================================== */
    /* 
        Mobile: < 640px
        Tablet: 640px - 1023px  
        Desktop: 1024px - 1279px
        Large Desktop: >= 1280px
    */
}

/* ============================================================
   다크 모드 지원 (선택적)
   ============================================================ */
@media (prefers-color-scheme: dark) {
    :root.auto-dark {
        --bg-primary: #0D1117;
        --bg-secondary: #161B22;
        --bg-tertiary: #21262D;
        
        --text-primary: #F0F6FC;
        --text-secondary: #C9D1D9;
        --text-tertiary: #8B949E;
        --text-muted: #6E7681;
        
        --border-light: #30363D;
        --border-default: #484F58;
        --border-strong: #6E7681;
        
        --color-gray-50: #21262D;
        --color-gray-100: #30363D;
        --color-gray-200: #484F58;
        --color-gray-800: #C9D1D9;
        --color-gray-900: #F0F6FC;
    }
}

/* ============================================================
   기본 리셋 및 글로벌 스타일
   ============================================================ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    min-height: 100vh;
}

a {
    color: inherit;
    text-decoration: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input, textarea, select {
    font-family: inherit;
    font-size: inherit;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ============================================================
   유틸리티 클래스
   ============================================================ */

/* Text Colors */
.text-primary { color: var(--color-primary) !important; }
.text-success { color: var(--color-success) !important; }
.text-warning { color: var(--color-warning) !important; }
.text-error { color: var(--color-error) !important; }
.text-muted { color: var(--text-muted) !important; }

/* Background Colors */
.bg-primary { background-color: var(--color-primary) !important; }
.bg-success { background-color: var(--color-success) !important; }
.bg-warning { background-color: var(--color-warning) !important; }
.bg-error { background-color: var(--color-error) !important; }

/* Spacing */
.mt-0 { margin-top: 0 !important; }
.mt-2 { margin-top: var(--space-2) !important; }
.mt-4 { margin-top: var(--space-4) !important; }
.mt-6 { margin-top: var(--space-6) !important; }
.mb-0 { margin-bottom: 0 !important; }
.mb-2 { margin-bottom: var(--space-2) !important; }
.mb-4 { margin-bottom: var(--space-4) !important; }
.mb-6 { margin-bottom: var(--space-6) !important; }

/* Display */
.hidden { display: none !important; }
.block { display: block !important; }
.flex { display: flex !important; }
.grid { display: grid !important; }

/* Flex */
.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.flex-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Text */
.text-center { text-align: center !important; }
.text-left { text-align: left !important; }
.text-right { text-align: right !important; }

.font-medium { font-weight: var(--font-weight-medium) !important; }
.font-semibold { font-weight: var(--font-weight-semibold) !important; }
.font-bold { font-weight: var(--font-weight-bold) !important; }

/* Truncate */
.truncate {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Screen Reader Only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}