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

:root {
    /* Primary Colors */
    --primary-50: #eff6ff;
    --primary-100: #dbeafe;
    --primary-200: #bfdbfe;
    --primary-300: #93c5fd;
    --primary-400: #60a5fa;
    --primary-500: #3b82f6;
    --primary-600: #2563eb;
    --primary-700: #1d4ed8;
    --primary-800: #1e40af;
    --primary-900: #1e3a8a;
    
    /* Secondary Colors */
    --secondary-50: #f8fafc;
    --secondary-100: #f1f5f9;
    --secondary-200: #e2e8f0;
    --secondary-300: #cbd5e1;
    --secondary-400: #94a3b8;
    --secondary-500: #64748b;
    --secondary-600: #475569;
    --secondary-700: #334155;
    --secondary-800: #1e293b;
    --secondary-900: #0f172a;
    
    /* Success Colors */
    --success-50: #f0fdf4;
    --success-100: #dcfce7;
    --success-500: #22c55e;
    --success-600: #16a34a;
    --success-700: #15803d;
    
    /* Warning Colors */
    --warning-50: #fffbeb;
    --warning-100: #fef3c7;
    --warning-500: #f59e0b;
    --warning-600: #d97706;
    --warning-700: #b45309;
    
    /* Error Colors */
    --error-50: #fef2f2;
    --error-100: #fee2e2;
    --error-500: #ef4444;
    --error-600: #dc2626;
    --error-700: #b91c1c;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: var(--secondary-700);
    background-color: var(--secondary-50);
    overflow-x: hidden;
}

/* Main App Layout */
.main-app {
    display: grid;
    grid-template-areas: 
        "header header"
        "sidebar main";
    grid-template-columns: 280px 1fr;
    grid-template-rows: 70px 1fr;
    height: 100vh;
    background: var(--secondary-50);
}

/* Header Styles */
.main-header {
    grid-area: header;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-lg);
    background: white;
    border-bottom: 1px solid var(--secondary-200);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.25rem;
    color: var(--secondary-600);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.menu-toggle:hover {
    background: var(--secondary-100);
    color: var(--secondary-700);
}

.logo-small {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--primary-600);
}

.logo-small i {
    font-size: 1.5rem;
}

.header-center {
    flex: 1;
    max-width: 500px;
    margin: 0 var(--spacing-xl);
}

.search-bar {
    position: relative;
    width: 100%;
}

.search-bar i {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--secondary-400);
    font-size: 0.875rem;
}

.search-bar input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md) var(--spacing-sm) 2.5rem;
    border: 1px solid var(--secondary-200);
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    background: var(--secondary-50);
    transition: var(--transition-fast);
}

.search-bar input:focus {
    outline: none;
    border-color: var(--primary-500);
    background: white;
    box-shadow: 0 0 0 3px var(--primary-100);
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.notifications {
    position: relative;
}

.notification-btn {
    position: relative;
    background: none;
    border: none;
    font-size: 1.25rem;
    color: var(--secondary-600);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.notification-btn:hover {
    background: var(--secondary-100);
    color: var(--secondary-700);
}

.notification-badge {
    position: absolute;
    top: -2px;
    right: -2px;
    background: var(--error-500);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 2px 6px;
    border-radius: 10px;
    min-width: 18px;
    text-align: center;
}

.user-menu {
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.user-menu:hover {
    background: var(--secondary-100);
}

.user-avatar img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
}

.user-info {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.user-name {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--secondary-700);
}

.user-role {
    font-size: 0.75rem;
    color: var(--secondary-500);
}

.user-menu-btn {
    background: none;
    border: none;
    color: var(--secondary-400);
    cursor: pointer;
    transition: var(--transition-fast);
}

.user-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background: white;
    border: 1px solid var(--secondary-200);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    min-width: 200px;
    padding: var(--spacing-sm) 0;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition-fast);
}

.user-dropdown.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.user-dropdown a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--secondary-700);
    text-decoration: none;
    transition: var(--transition-fast);
}

.user-dropdown a:hover {
    background: var(--secondary-50);
}

.user-dropdown hr {
    border: none;
    border-top: 1px solid var(--secondary-200);
    margin: var(--spacing-sm) 0;
}

/* Sidebar Styles */
.sidebar {
    grid-area: sidebar;
    background: white;
    border-right: 1px solid var(--secondary-200);
    overflow-y: auto;
    transition: var(--transition-normal);
}

.sidebar-nav {
    padding: var(--spacing-lg) 0;
}

.nav-menu {
    list-style: none;
}

.nav-section {
    margin: var(--spacing-lg) 0 var(--spacing-sm) 0;
}

.nav-section-title {
    display: block;
    padding: 0 var(--spacing-lg);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--secondary-400);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.nav-item {
    margin: 2px var(--spacing-md);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--secondary-600);
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: var(--transition-fast);
}

.nav-link:hover {
    background: var(--primary-50);
    color: var(--primary-700);
}

.nav-item.active .nav-link {
    background: var(--primary-100);
    color: var(--primary-700);
    font-weight: 600;
}

.nav-link i {
    font-size: 1.125rem;
    width: 20px;
    text-align: center;
}

/* Main Content */
.main-content {
    grid-area: main;
    padding: var(--spacing-xl);
    overflow-y: auto;
    background: var(--secondary-50);
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.loading-spinner {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-xl);
}

.loading-spinner i {
    font-size: 2rem;
    color: var(--primary-500);
    margin-bottom: var(--spacing-md);
}

.loading-spinner p {
    color: var(--secondary-600);
    font-weight: 500;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .main-app {
        grid-template-columns: 250px 1fr;
    }
    
    .header-center {
        max-width: 300px;
        margin: 0 var(--spacing-md);
    }
}

@media (max-width: 768px) {
    .main-app {
        grid-template-areas: 
            "header header"
            "main main";
        grid-template-columns: 1fr;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .sidebar {
        position: fixed;
        top: 70px;
        left: -280px;
        width: 280px;
        height: calc(100vh - 70px);
        z-index: 999;
        box-shadow: var(--shadow-lg);
    }
    
    .sidebar.show {
        left: 0;
    }
    
    .header-center {
        display: none;
    }
    
    .user-info {
        display: none;
    }
}

@media (max-width: 480px) {
    .main-content {
        padding: var(--spacing-md);
    }
    
    .header-right {
        gap: var(--spacing-sm);
    }
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.fade-in {
    animation: fadeIn var(--transition-normal) ease-in-out;
}

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

.slide-in-right {
    animation: slideInRight var(--transition-normal) ease-out;
}

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

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

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

.form-control {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--secondary-300);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    transition: var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px var(--primary-100);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-fast);
}

.btn-primary {
    background: var(--primary-600);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-700);
}

.btn-secondary {
    background: var(--secondary-200);
    color: var(--secondary-700);
}

.btn-secondary:hover {
    background: var(--secondary-300);
}

.btn-success {
    background: var(--success-600);
    color: white;
}

.btn-success:hover {
    background: var(--success-700);
}

.btn-warning {
    background: var(--warning-600);
    color: white;
}

.btn-warning:hover {
    background: var(--warning-700);
}

.btn-error {
    background: var(--error-600);
    color: white;
}

.btn-error:hover {
    background: var(--error-700);
}



/* Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.modal-overlay.show {
    opacity: 1;
}

.modal-content {
    background: white;
    border-radius: var(--radius-xl);
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    transform: scale(0.95);
    transition: transform var(--transition-normal);
}

.modal-overlay.show .modal-content {
    transform: scale(1);
}

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

.modal-header h3 {
    margin: 0;
    color: var(--secondary-800);
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.25rem;
    color: var(--secondary-400);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.modal-close:hover {
    background: var(--secondary-100);
    color: var(--secondary-600);
}

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

.modal-footer {
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--secondary-200);
    margin-top: var(--spacing-lg);
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.form-group label {
    font-weight: 500;
    color: var(--secondary-700);
    font-size: 0.875rem;
}

.form-group input,
.form-group select {
    padding: var(--spacing-md);
    border: 1px solid var(--secondary-300);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    transition: var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px var(--primary-100);
}

@media (max-width: 768px) {
    .modal-content {
        width: 95%;
        margin: var(--spacing-md);
    }
    
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .modal-footer {
        flex-direction: column-reverse;
    }
}