/**
 * Utilities Collection - Unified Design System
 * 모든 서비스에서 공통으로 사용할 디자인 시스템
 */

:root {
    /* Primary Brand Colors */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --primary-light: #667eea;
    --primary-dark: #764ba2;
    --primary-alpha: rgba(102, 126, 234, 0.1);
    
    /* Secondary Colors */
    --secondary-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --accent-color: #00796b;
    --success-color: #4caf50;
    --warning-color: #ff9800;
    --error-color: #f44336;
    
    /* Dark Mode Colors */
    --dark-primary-gradient: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    --dark-bg-color: #2d3748;
    --dark-text-color: #e2e8f0;
    --dark-card-bg: rgba(45, 55, 72, 0.95);
    --dark-shadow: 0 20px 60px rgba(0,0,0,0.4);
    
    /* Light Mode Colors */
    --bg-color: #ffffff;
    --text-color: #2d3748;
    --text-secondary: #4a5568;
    --text-muted: #718096;
    --card-bg: rgba(255, 255, 255, 0.98);
    --border-color: #e2e8f0;
    --shadow: 0 20px 60px rgba(0,0,0,0.15);
    
    /* Typography */
    --font-family: 'Segoe UI', 'Noto Sans JP', 'Noto Sans KR', 'Pretendard', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease-out;
    --transition-base: 0.3s ease-out;
    --transition-slow: 0.5s ease-out;
    
    /* Z-Index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal: 1040;
    --z-popover: 1050;
    --z-tooltip: 1060;
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --primary-gradient: var(--dark-primary-gradient);
    --bg-color: var(--dark-bg-color);
    --text-color: var(--dark-text-color);
    --text-secondary: #a0aec0;
    --text-muted: #718096;
    --card-bg: var(--dark-card-bg);
    --border-color: #4a5568;
    --shadow: var(--dark-shadow);
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

*::before,
*::after {
    box-sizing: border-box;
}

html {
    font-size: 16px;
    line-height: 1.5;
    -webkit-text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-color);
    background: var(--primary-gradient);
    min-height: 100vh;
    transition: background var(--transition-base), color var(--transition-base);
}

/* Container System */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.container-sm {
    max-width: 640px;
}

.container-md {
    max-width: 768px;
}

.container-lg {
    max-width: 1024px;
}

/* Card Components */
.card {
    background: var(--card-bg);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all var(--transition-base);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 25px 70px rgba(0,0,0,0.25);
}

.card-compact {
    padding: var(--spacing-lg);
}

.card-header {
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.card-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: var(--spacing-sm);
}

.card-subtitle {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    font-weight: 500;
}

/* Button Components */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-base);
    font-weight: 600;
    line-height: 1;
    border: none;
    border-radius: var(--radius-lg);
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-base);
    user-select: none;
    white-space: nowrap;
}

.btn:focus {
    outline: 2px solid var(--primary-light);
    outline-offset: 2px;
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 4px 14px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: var(--card-bg);
    color: var(--text-color);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--primary-light);
    box-shadow: 0 4px 14px rgba(102, 126, 234, 0.2);
}

.btn-success {
    background: var(--success-color);
    color: white;
}

.btn-success:hover {
    background: #45a049;
    transform: translateY(-1px);
}

.btn-sm {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
}

.btn-lg {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: var(--font-size-lg);
}

/* Form Components */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: var(--spacing-sm);
}

.form-input,
.form-select {
    width: 100%;
    padding: var(--spacing-md);
    font-size: var(--font-size-base);
    line-height: 1.5;
    color: var(--text-color);
    background: var(--bg-color);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

/* Input Row Layout */
.input-row {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.input-row > * {
    flex: 1;
    min-width: 120px;
}

/* Result Components */
.result-box {
    background: var(--primary-alpha);
    border: 2px solid var(--primary-light);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
    text-align: center;
}

.result-success {
    background: rgba(76, 175, 80, 0.1);
    border-color: var(--success-color);
    color: var(--success-color);
}

.result-error {
    background: rgba(244, 67, 54, 0.1);
    border-color: var(--error-color);
    color: var(--error-color);
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-xs { font-size: var(--font-size-xs); }
.text-sm { font-size: var(--font-size-sm); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }
.text-2xl { font-size: var(--font-size-2xl); }

.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }

.text-primary { color: var(--primary-light); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }
.text-success { color: var(--success-color); }
.text-error { color: var(--error-color); }

.mb-xs { margin-bottom: var(--spacing-xs); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.mt-xs { margin-top: var(--spacing-xs); }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

/* Page Layout */
.page-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.page-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.page-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: var(--spacing-sm);
}

.page-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* Navigation */
.nav-back {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.9);
    color: var(--text-color);
    text-decoration: none;
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
    font-weight: 600;
    transition: all var(--transition-base);
    margin-bottom: var(--spacing-lg);
}

.nav-back:hover {
    background: white;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .card {
        padding: var(--spacing-lg);
    }
    
    .input-row {
        flex-direction: column;
    }
    
    .input-row > * {
        width: 100%;
        min-width: unset;
    }
    
    .page-title {
        font-size: var(--font-size-2xl);
    }
    
    .btn {
        width: 100%;
    }
}

/* Dark Mode Specific Adjustments */
[data-theme="dark"] .card {
    border: 1px solid rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .form-input,
[data-theme="dark"] .form-select {
    background: rgba(45, 55, 72, 0.8);
    border-color: #4a5568;
}

[data-theme="dark"] .nav-back {
    background: rgba(45, 55, 72, 0.9);
    color: var(--dark-text-color);
}

[data-theme="dark"] .nav-back:hover {
    background: rgba(45, 55, 72, 1);
}

/* Animation Classes */
.fade-in {
    animation: fadeInUp 0.6s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Loading States */
.loading {
    opacity: 0.7;
    cursor: not-allowed;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    right: var(--spacing-md);
    width: 16px;
    height: 16px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    transform: translateY(-50%);
}

@keyframes spin {
    from { transform: translateY(-50%) rotate(0deg); }
    to { transform: translateY(-50%) rotate(360deg); }
}

/* Result Highlighting */
.highlight-result {
    font-weight: 700;
    font-size: 1.1em;
    color: var(--primary-dark);
    background: var(--primary-alpha);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    border: 1px solid var(--primary-light);
    display: inline-block;
    margin: 0 var(--spacing-xs);
    transition: all var(--transition-base);
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.15);
}

.highlight-result:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.25);
}

[data-theme="dark"] .highlight-result {
    color: var(--primary-light);
    background: rgba(102, 126, 234, 0.2);
    border-color: var(--primary-light);
}

/* Text-only highlighting (no background box) */
.highlight-text {
    font-weight: 700;
    font-size: 1.1em;
    color: #2563eb;
    text-shadow: 1px 1px 3px rgba(37, 99, 235, 0.4);
    text-decoration: underline;
    text-decoration-color: #3b82f6;
    text-decoration-thickness: 2px;
    text-underline-offset: 3px;
    transition: all var(--transition-base);
}

.highlight-text:hover {
    color: #1d4ed8;
    text-shadow: 2px 2px 5px rgba(29, 78, 216, 0.5);
    text-decoration-thickness: 3px;
    text-underline-offset: 2px;
    text-decoration-color: #2563eb;
}

[data-theme="dark"] .highlight-text {
    color: #60a5fa;
    text-shadow: 1px 1px 3px rgba(96, 165, 250, 0.6);
    text-decoration-color: #93c5fd;
}

[data-theme="dark"] .highlight-text:hover {
    color: #93c5fd;
    text-shadow: 2px 2px 5px rgba(147, 197, 253, 0.8);
    text-decoration-color: #dbeafe;
}