/**
 * 산타 프로젝트 - 크리스마스 미니멀 디자인 시스템
 * Design System: Minimal Christmas Theme
 */

:root {
    /* === 색상 팔레트 (Christmas Minimal) === */
    /* Primary Colors - 딥 네이비 블루 기반 */
    --color-primary: #1a365d;
    --color-primary-light: #2d5a87;
    --color-primary-dark: #0f2744;
    
    /* Christmas Accent Colors */
    --color-christmas-red: #e53e3e;
    --color-christmas-gold: #f8e71c;
    --color-christmas-mint: #38b2ac;
    --color-christmas-warm-orange: #ed8936;
    
    /* Background Colors */
    --color-bg-white: #ffffff;
    --color-bg-light: #f7fafc;
    --color-bg-dark: rgba(20, 20, 20, 0.9);
    --color-bg-card: rgba(26, 54, 93, 0.05);
    
    /* Text Colors */
    --color-text-primary: #2d3748;
    --color-text-secondary: #4a5568;
    --color-text-light: #edf2f7;
    --color-text-muted: #a0aec0;
    
    /* Border Colors */
    --color-border-light: #e2e8f0;
    --color-border-medium: #cbd5e0;
    --color-border-dark: #4a5568;
    
    /* === 타이포그래피 === */
    /* Font Families */
    --font-primary: 'Inter', 'Noto Sans KR', 'Nanum Gothic', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-accent: 'Paperlogy-8ExtraBold', 'Inter', sans-serif;
    
    /* Font Sizes - rem 기반 */
    --font-size-xs: 0.75rem;      /* 12px */
    --font-size-sm: 0.875rem;     /* 14px */
    --font-size-base: 1rem;       /* 16px */
    --font-size-lg: 1.125rem;     /* 18px */
    --font-size-xl: 1.25rem;      /* 20px */
    --font-size-2xl: 1.5rem;      /* 24px */
    --font-size-3xl: 1.875rem;    /* 30px */
    --font-size-4xl: 2.25rem;     /* 36px */
    --font-size-5xl: 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-normal: 1.5;
    --line-height-relaxed: 1.75;
    --line-height-loose: 2;
    
    /* === 간격 (Spacing) === */
    --spacing-xs: 0.25rem;    /* 4px */
    --spacing-sm: 0.5rem;     /* 8px */
    --spacing-md: 1rem;       /* 16px */
    --spacing-lg: 1.5rem;     /* 24px */
    --spacing-xl: 2rem;       /* 32px */
    --spacing-2xl: 3rem;      /* 48px */
    --spacing-3xl: 4rem;      /* 64px */
    --spacing-4xl: 6rem;      /* 96px */
    
    /* === 반응형 브레이크포인트 === */
    --breakpoint-sm: 576px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 992px;
    --breakpoint-xl: 1200px;
    --breakpoint-2xl: 1400px;
    
    /* === 그림자 (Shadows) === */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 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);
    
    /* === 모서리 반경 (Border Radius) === */
    --radius-sm: 0.25rem;     /* 4px */
    --radius-md: 0.375rem;    /* 6px */
    --radius-lg: 0.5rem;      /* 8px */
    --radius-xl: 0.75rem;     /* 12px */
    --radius-2xl: 1rem;       /* 16px */
    --radius-full: 9999px;    /* 완전한 원형 */
    
    /* === 트랜지션 (Transitions) === */
    --transition-fast: 150ms;
    --transition-base: 200ms;
    --transition-slow: 300ms;
    --transition-slower: 500ms;
    
    /* === Z-Index 레이어 === */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

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

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

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg-white);
}

/* === 크리스마스 미니멀 애니메이션 === */
@keyframes twinkle {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

/* === 유틸리티 클래스 === */
.fade-in {
    animation: fadeIn var(--transition-slow) ease-in;
}

.fade-in-up {
    animation: fadeInUp var(--transition-slow) ease-out;
}

.twinkle {
    animation: twinkle 2s ease-in-out infinite;
}

.pulse {
    animation: pulse 2s ease-in-out infinite;
}

/* === 반응형 컨테이너 === */
.container-minimal {
    width: 100%;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
}

@media (min-width: 768px) {
    .container-minimal {
        padding-left: var(--spacing-xl);
        padding-right: var(--spacing-xl);
    }
}

/* === 카드 컴포넌트 === */
.card-minimal {
    background: var(--color-bg-white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-xl);
    transition: box-shadow var(--transition-base) ease;
}

.card-minimal:hover {
    box-shadow: var(--shadow-lg);
}

/* === 버튼 컴포넌트 === */
.btn-minimal {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    line-height: var(--line-height-tight);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-full);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base) ease;
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-text-light);
}

.btn-primary:hover {
    background-color: var(--color-primary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-accent {
    background-color: var(--color-christmas-red);
    color: var(--color-text-light);
}

.btn-accent:hover {
    background-color: #c53030;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* === 폼 요소 === */
.form-group-minimal {
    margin-bottom: var(--spacing-lg);
}

.form-label-minimal {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

.form-input-minimal {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg-white);
    border: 1px solid var(--color-border-medium);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-base) ease, box-shadow var(--transition-base) ease;
}

.form-input-minimal:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(26, 54, 93, 0.1);
}

/* === 크리스마스 장식 요소 === */
.christmas-star {
    display: inline-block;
    color: var(--color-christmas-gold);
    font-size: var(--font-size-xl);
    animation: twinkle 2s ease-in-out infinite;
}

.christmas-divider {
    height: 1px;
    background: linear-gradient(to right, transparent, var(--color-border-light), transparent);
    margin: var(--spacing-xl) 0;
}

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

/* === 링크 스타일 === */
a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-base) ease;
}

a:hover {
    color: var(--color-primary-light);
}

/* === 반응형 텍스트 === */
@media (max-width: 767px) {
    html {
        font-size: 14px;
    }
}

@media (min-width: 1200px) {
    html {
        font-size: 18px;
    }
}