/* ===== TOPPING BASE CSS FRAMEWORK ===== */

/* CSS Variables for Consistent Theming */
:root {
    /* Brand Colors */
    --primary-color: #87604f;
    --primary-hover: #6f4f41;
    --primary-light: #f5eeec;
    
    --secondary-color: #2d3748;
    --secondary-hover: #1a202c;
    --secondary-light: #f7fafc;
    
    /* Status Colors */
    --success-color: #059669;
    --success-light: #f0fdf4;
    --success-border: #bbf7d0;
    
    --error-color: #dc2626;
    --error-light: #fef2f2;
    --error-border: #fecaca;
    
    --warning-color: #856404;
    --warning-light: #fff3cd;
    --warning-border: #ffeaa7;
    
    --info-color: #2563eb;
    --info-light: #eff6ff;
    --info-border: #bfdbfe;
    
    /* Neutral Colors */
    --gray-50: #f8f9fa;
    --gray-100: #f1f3f4;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-400: #ced4da;
    --gray-500: #adb5bd;
    --gray-600: #6c757d;
    --gray-700: #495057;
    --gray-800: #343a40;
    --gray-900: #212529;
    
    /* Typography */
    --font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 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-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --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);
    
    /* Layout */
    --sidebar-width: 160px;
    --header-height: 60px;
    --footer-height: 200px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Z-indexes */
    --z-sidebar: 1000;
    --z-dropdown: 1010;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* ===== RESET & BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    line-height: 1.5;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--gray-800);
    background-color: var(--gray-50);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== LAYOUT SYSTEM ===== */

/* Skip Link for Accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--primary-color);
    color: white;
    padding: 8px;
    text-decoration: none;
    text-decoration-color: #cccccc;
    border-radius: var(--radius-md);
    z-index: var(--z-tooltip);
}

.skip-link:focus {
    top: 6px;
}

/* Navbar Fragment Fix - Neutralize empty div wrapper */
div[th\\:replace*="navbar"] {
    display: none !important;
}

/* Main Layout */
.main-content {
    margin-left: var(--sidebar-width);
    min-height: calc(100vh - var(--footer-height));
    padding: var(--spacing-xl);
    transition: margin-left var(--transition-normal);
}

/* Content Wrapper for Main Layout */
.content-wrapper {
    margin-left: var(--sidebar-width);
    min-height: calc(100vh - var(--footer-height));
    transition: margin-left var(--transition-normal);
}

.page-header {
    background: white;
    padding: var(--spacing-lg) var(--spacing-xl);
    border-bottom: 1px solid var(--gray-200);
    margin-bottom: var(--spacing-xl);
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.25;
    margin-bottom: var(--spacing-md);
    color: var(--gray-900);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
    margin-bottom: var(--spacing-md);
    color: var(--gray-700);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover, a:focus {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* ===== FORM ELEMENTS ===== */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: var(--spacing-sm);
}

.form-control {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-base);
    line-height: 1.5;
    color: var(--gray-800);
    background-color: white;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.1);
}

.form-control::placeholder {
    color: var(--gray-500);
}

.form-control:disabled {
    background-color: var(--gray-100);
    color: var(--gray-500);
    cursor: not-allowed;
}

/* Form Validation States */
.form-control.is-valid {
    border-color: var(--success-color);
}

.form-control.is-invalid {
    border-color: var(--error-color);
}

.valid-feedback {
    color: var(--success-color);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-xs);
}

.invalid-feedback {
    color: var(--error-color);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-xs);
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-base);
    font-weight: 500;
    line-height: 1.5;
    text-align: center;
    text-decoration: none;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    user-select: none;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

/* Button Variants */
.btn-primary {
    color: white;
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-primary:hover, .btn-primary:focus {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
    text-decoration: none;
}

.btn-secondary {
    color: var(--primary-color);
    background-color: white;
    border-color: var(--primary-color);
}

.btn-secondary:hover, .btn-secondary:focus {
    color: white;
    background-color: var(--primary-color);
    text-decoration: none;
}

.btn-outline {
    color: var(--gray-600);
    background-color: white;
    border-color: var(--gray-300);
}

.btn-outline:hover, .btn-outline:focus {
    color: var(--gray-800);
    background-color: var(--gray-50);
    border-color: var(--gray-400);
    text-decoration: none;
}

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

.btn-danger {
    color: white;
    background-color: var(--error-color);
    border-color: var(--error-color);
}

/* Button Sizes */
.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);
}

.btn-block {
    width: 100%;
}

/* ===== CARDS ===== */
.card {
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.card-header {
    padding: var(--spacing-lg) var(--spacing-xl);
    background-color: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
}

.card-body {
    padding: var(--spacing-xl);
}

.card-footer {
    padding: var(--spacing-lg) var(--spacing-xl);
    background-color: var(--gray-50);
    border-top: 1px solid var(--gray-200);
}

/* ===== MODALS ===== */
.modal {
    display: none;
    position: fixed;
    z-index: var(--z-modal);
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    background-color: white;
    margin: 5% auto;
    border: none;
    border-radius: var(--radius-xl);
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    animation: modalFadeIn 0.3s ease;
}

@keyframes modalFadeIn {
    from {
        opacity: 0;
        transform: translateY(-50px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-xl);
    border-bottom: 1px solid var(--gray-200);
    background-color: var(--gray-50);
}

.modal-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--gray-900);
    margin: 0;
}

.modal-close {
    color: var(--gray-500);
    font-size: 24px;
    font-weight: bold;
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.modal-close:hover, .modal-close:focus {
    color: var(--gray-800);
    background-color: var(--gray-100);
}

.modal-body {
    padding: var(--spacing-xl);
    max-height: calc(80vh - 120px);
    overflow-y: auto;
}

.modal-description {
    color: var(--gray-600);
    margin-bottom: var(--spacing-lg);
}

/* Modal Variants */
.confirmation-modal-content .modal-body {
    text-align: center;
}

.confirmation-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-top: var(--spacing-lg);
}

.success-modal-content .modal-body,
.error-modal-content .modal-body {
    text-align: center;
    padding: var(--spacing-2xl);
}

.success-icon,
.error-icon {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-lg);
}

.loading-modal-content {
    max-width: 300px;
}

/* ===== ALERTS & MESSAGES ===== */
.alert {
    padding: var(--spacing-lg);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
}

.alert-success {
    color: var(--success-color);
    background-color: var(--success-light);
    border-color: var(--success-border);
}

.alert-error {
    color: var(--error-color);
    background-color: var(--error-light);
    border-color: var(--error-border);
}

.alert-warning {
    color: var(--warning-color);
    background-color: var(--warning-light);
    border-color: var(--warning-border);
}

.alert-info {
    color: var(--info-color);
    background-color: var(--info-light);
    border-color: var(--info-border);
}

.result-message {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-md);
}

/* ===== LOADING SPINNER ===== */
.loading-spinner {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    padding: var(--spacing-xl);
}

.spinner {
    width: 20px;
    height: 20px;
    border: 3px solid var(--gray-200);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ===== UTILITY CLASSES ===== */

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

/* Flexbox */
.flex-column { flex-direction: column !important; }
.flex-row { flex-direction: row !important; }
.justify-start { justify-content: flex-start !important; }
.justify-center { justify-content: center !important; }
.justify-end { justify-content: flex-end !important; }
.justify-between { justify-content: space-between !important; }
.align-start { align-items: flex-start !important; }
.align-center { align-items: center !important; }
.align-end { align-items: flex-end !important; }

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

/* Text Colors */
.text-primary { color: var(--primary-color) !important; }
.text-secondary { color: var(--secondary-color) !important; }
.text-success { color: var(--success-color) !important; }
.text-danger { color: var(--error-color) !important; }
.text-warning { color: var(--warning-color) !important; }
.text-info { color: var(--info-color) !important; }
.text-muted { color: var(--gray-500) !important; }

/* Background Colors */
.bg-primary { background-color: var(--primary-color) !important; }
.bg-secondary { background-color: var(--secondary-color) !important; }
.bg-success { background-color: var(--success-color) !important; }
.bg-danger { background-color: var(--error-color) !important; }
.bg-warning { background-color: var(--warning-color) !important; }
.bg-info { background-color: var(--info-color) !important; }
.bg-light { background-color: var(--gray-100) !important; }
.bg-white { background-color: white !important; }

/* Margins */
.m-0 { margin: 0 !important; }
.m-auto { margin: auto !important; }
.mt-auto { margin-top: auto !important; }
.mb-auto { margin-bottom: auto !important; }
.ml-auto { margin-left: auto !important; }
.mr-auto { margin-right: auto !important; }

/* Padding */
.p-0 { padding: 0 !important; }

/* Border Radius */
.rounded { border-radius: var(--radius-md) !important; }
.rounded-lg { border-radius: var(--radius-lg) !important; }
.rounded-full { border-radius: var(--radius-full) !important; }

/* Shadows */
.shadow-sm { box-shadow: var(--shadow-sm) !important; }
.shadow-md { box-shadow: var(--shadow-md) !important; }
.shadow-lg { box-shadow: var(--shadow-lg) !important; }

/* ===== RESPONSIVE DESIGN ===== */

/* Mobile First Breakpoints */
@media (max-width: 767.98px) {
    :root {
        --sidebar-width: 0px;
    }
    
    .main-content,
    .content-wrapper {
        margin-left: 0;
        padding: var(--spacing-lg);
    }
    
    .page-header {
        padding: var(--spacing-md) var(--spacing-lg);
    }
    
    .modal-content {
        margin: 10% auto;
        width: 95%;
        max-height: 70vh;
    }
    
    .modal-header,
    .modal-body {
        padding: var(--spacing-lg);
    }
    
    .btn {
        padding: var(--spacing-md) var(--spacing-lg);
    }
    
    h1 { font-size: var(--font-size-3xl); }
    h2 { font-size: var(--font-size-2xl); }
    h3 { font-size: var(--font-size-xl); }
}

@media (max-width: 575.98px) {
    .modal-content {
        margin: 15% auto;
        width: 98%;
        max-height: 60vh;
    }
    
    .confirmation-buttons {
        flex-direction: column;
    }
    
    .btn-block-mobile {
        width: 100%;
    }
}

/* Tablet */
@media (min-width: 768px) and (max-width: 1023.98px) {
    .main-content,
    .content-wrapper {
        padding: var(--spacing-xl);
    }
}

/* Desktop */
@media (min-width: 1024px) {
    .container {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 var(--spacing-xl);
    }
}

/* Print Styles */
@media print {
    .sidebar, .modal, .btn, .footer {
        display: none !important;
    }
    
    .main-content,
    .content-wrapper {
        margin-left: 0 !important;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    :root {
        --gray-200: #000000;
        --gray-500: #333333;
        --gray-700: #000000;
    }
}

/* Dark Mode Support (Future Enhancement) */
@media (prefers-color-scheme: dark) {
    /* Dark mode styles can be added here in the future */
}