/* ============================================
   MODERN USERCP - Multi-platform Design
   ============================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Modern Color Palette */
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #8b5cf6;
    --accent: #ec4899;
    
    /* Status Colors */
    --success: #10b981;
    --success-light: #34d399;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;
    
    /* Neutral Colors */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* 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: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --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);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Sidebar */
    --sidebar-width: 320px;
    --sidebar-width-mobile: 280px;
}

/* ============================================
   Base Styles
   ============================================ */

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-attachment: fixed;
    color: var(--gray-900);
    line-height: 1.6;
    min-height: 100vh;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

/* ============================================
   Container & Layout
   ============================================ */

.container {
    display: flex;
    min-height: 100vh;
    max-width: 1600px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
    background: transparent;
    box-shadow: none;
}

/* ============================================
   Mobile Menu Toggle
   ============================================ */

.user-mobile-toggle,
.user-mobile-toggle-inline {
    display: none;
    position: fixed;
    top: var(--spacing-md);
    left: var(--spacing-md);
    z-index: 1001;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    border: none;
    width: 48px;
    height: 48px;
    border-radius: var(--radius-lg);
    cursor: pointer;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    box-shadow: var(--shadow-xl);
    transition: var(--transition-base);
    -webkit-tap-highlight-color: transparent;
    backdrop-filter: blur(10px);
}

.user-mobile-toggle:hover,
.user-mobile-toggle-inline:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-2xl);
}

.user-mobile-toggle:active,
.user-mobile-toggle-inline:active {
    transform: scale(0.95);
}

.user-mobile-toggle-inline {
    position: relative;
    top: auto;
    left: auto;
    margin-right: var(--spacing-md);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
}

.user-mobile-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.user-mobile-overlay.active {
    opacity: 1;
    visibility: visible;
}

.user-header-mobile {
    display: none;
    align-items: center;
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--gray-200);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

.user-page-title {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    flex: 1;
}

/* ============================================
   Sidebar (Left Column)
   ============================================ */

.left-column {
    width: var(--sidebar-width);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-right: 1px solid rgba(255, 255, 255, 0.2);
    color: white;
    padding: var(--spacing-xl);
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    z-index: 1000;
    box-shadow: var(--shadow-xl);
}

.left-column::-webkit-scrollbar {
    width: 6px;
}

.left-column::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
}

.left-column::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-full);
}

.left-column::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.5);
}

/* Mobile Sidebar */
@media (max-width: 991.98px) {
    .left-column {
        width: var(--sidebar-width-mobile);
        position: fixed;
        top: 0;
        left: 0;
        height: 100vh;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        will-change: transform;
        box-shadow: var(--shadow-2xl);
        z-index: 1000;
    }
    
    .left-column.active {
        transform: translateX(0);
    }
    
    /* Ẩn nút fixed, chỉ dùng nút inline trong header */
    .user-mobile-toggle {
        display: none;
    }
    
    .user-mobile-toggle-inline {
        display: flex;
    }
    
    .user-header-mobile {
        display: flex;
    }
    
    .right-column {
        width: 100%;
        padding-top: 0;
    }
}

/* ============================================
   Account Info Section
   ============================================ */

.account-info {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
}

.account-info:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.account-info h3 {
    color: #fff;
    margin-bottom: var(--spacing-md);
    font-size: 1.25rem;
    font-weight: 700;
    border-bottom: 2px solid rgba(255, 255, 255, 0.3);
    padding-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.account-info p {
    margin-bottom: var(--spacing-sm);
    font-size: 0.9rem;
    line-height: 1.6;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.account-info strong {
    font-weight: 600;
    min-width: 80px;
}

#balance {
    color: var(--success-light);
    font-weight: 700;
    font-size: 1.1rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* ============================================
   Menu Section
   ============================================ */

.menu-section {
    margin-bottom: var(--spacing-xl);
}

.menu-section h3 {
    color: #fff;
    margin-bottom: var(--spacing-md);
    font-size: 1.25rem;
    font-weight: 700;
    border-bottom: 2px solid rgba(255, 255, 255, 0.3);
    padding-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.menu {
    list-style: none;
    margin: 0;
    padding: 0;
}

.menu li {
    margin-bottom: var(--spacing-xs);
}

.menu-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    transition: var(--transition-base);
    border-left: 3px solid transparent;
    min-height: 48px;
    font-weight: 500;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    position: relative;
    overflow: hidden;
}

.menu-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left var(--transition-slow);
}

.menu-item:hover::before {
    left: 100%;
}

.menu-item:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateX(8px);
    border-left-color: var(--success-light);
    color: #fff;
}

.menu-item:active {
    transform: translateX(4px) scale(0.98);
}

.menu-item.active {
    background: rgba(255, 255, 255, 0.25);
    border-left-color: var(--success-light);
    font-weight: 600;
    color: #fff;
    box-shadow: var(--shadow-md);
}

.logout-link {
    color: #ff6b6b !important;
    border-left-color: #ff6b6b !important;
}

.logout-link:hover {
    background: rgba(255, 107, 107, 0.2) !important;
    border-left-color: #ff6b6b !important;
}

@media (max-width: 991.98px) {
    .menu-item:hover {
        transform: none;
    }
    
    .menu-item:active {
        transform: scale(0.98);
        background: rgba(255, 255, 255, 0.25);
    }
}

/* ============================================
   Information Section
   ============================================ */

.information {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow-md);
}

.information h3 {
    color: #fff;
    margin-bottom: var(--spacing-md);
    font-size: 1.25rem;
    font-weight: 700;
    border-bottom: 2px solid rgba(255, 255, 255, 0.3);
    padding-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.information p {
    margin-bottom: var(--spacing-sm);
    font-size: 0.9rem;
    line-height: 1.6;
}

.information a {
    color: var(--success-light);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition-base);
    border-bottom: 1px solid transparent;
}

.information a:hover {
    color: #fff;
    border-bottom-color: var(--success-light);
}

/* ============================================
   Right Column (Content Area)
   ============================================ */

.right-column {
    flex: 1;
    padding: var(--spacing-xl);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    overflow-y: auto;
    min-width: 0;
    min-height: 100vh;
}

@media (max-width: 767.98px) {
    .right-column {
        padding: var(--spacing-md);
    }
}

#content-area {
    min-height: 500px;
    animation: fadeIn var(--transition-base);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================
   Page Header
   ============================================ */

.page-header {
    border-bottom: 3px solid var(--primary);
    padding-bottom: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    animation: slideDown var(--transition-base);
}

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

.page-header h2 {
    color: var(--gray-900);
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-header p {
    color: var(--gray-600);
    font-size: 1rem;
}

/* ============================================
   Cards
   ============================================ */

.card {
    background: #fff;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    border: 1px solid var(--gray-200);
    transition: var(--transition-base);
    animation: fadeInUp var(--transition-base);
    position: relative;
    overflow: hidden;
}

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

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.card-header {
    padding: var(--spacing-md) 0;
    margin-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--gray-200);
}

.card-header h2,
.card-header h3 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
}

.card-body {
    padding: 0;
}

.bg-light {
    background: var(--gray-50) !important;
}

@media (max-width: 767.98px) {
    .card {
        padding: var(--spacing-md);
        border-radius: var(--radius-md);
    }
    
    .card-header h2,
    .card-header h3 {
        font-size: 1.25rem;
    }
}

/* ============================================
   Forms
   ============================================ */

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--gray-700);
    font-size: 0.9rem;
}

.form-control {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: 1rem;
    min-height: 48px;
    transition: var(--transition-base);
    -webkit-appearance: none;
    appearance: none;
    background: #fff;
    color: var(--gray-900);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-control::placeholder {
    color: var(--gray-400);
}

@media (max-width: 575.98px) {
    .form-control {
        font-size: 16px; /* Prevents zoom on iOS */
    }
}

/* ============================================
   Buttons
   ============================================ */

.btn {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    border: none;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition-base);
    min-height: 48px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn:active {
    transform: translateY(0) scale(0.98);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

.btn-success {
    background: linear-gradient(135deg, var(--success) 0%, #059669 100%);
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger) 0%, #dc2626 100%);
}

.btn-secondary {
    background: linear-gradient(135deg, var(--gray-600) 0%, var(--gray-700) 100%);
}

.btn-sm {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
    min-height: 36px;
}

@media (max-width: 575.98px) {
    .btn {
        width: 100%;
        margin-bottom: var(--spacing-sm);
    }
}

/* ============================================
   Tables
   ============================================ */

.table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin: 0 calc(-1 * var(--spacing-md));
    padding: 0 var(--spacing-md);
    border-radius: var(--radius-md);
}

.table {
    width: 100%;
    border-collapse: collapse;
    margin-top: var(--spacing-lg);
    background: white;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.table th,
.table td {
    padding: var(--spacing-md) var(--spacing-lg);
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

.table th {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    font-weight: 600;
    white-space: nowrap;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.table tbody tr {
    transition: var(--transition-fast);
}

.table tbody tr:hover {
    background-color: var(--gray-50);
    transform: scale(1.01);
}

.table tbody tr:last-child td {
    border-bottom: none;
}

@media (max-width: 767.98px) {
    .table {
        font-size: 0.875rem;
    }
    
    .table th,
    .table td {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .table-responsive {
        margin: 0 calc(-1 * var(--spacing-md));
        padding: 0 var(--spacing-md);
    }
    
    /* Stack table on mobile */
    .table-mobile-stack {
        display: block;
    }
    
    .table-mobile-stack thead {
        display: none;
    }
    
    .table-mobile-stack tbody,
    .table-mobile-stack tr,
    .table-mobile-stack td {
        display: block;
        width: 100%;
    }
    
    .table-mobile-stack tr {
        border: 1px solid var(--gray-300);
        border-radius: var(--radius-md);
        margin-bottom: var(--spacing-md);
        padding: var(--spacing-md);
        background: white;
        box-shadow: var(--shadow-md);
    }
    
    .table-mobile-stack td {
        border: none;
        padding: var(--spacing-sm) 0;
        text-align: left !important;
    }
    
    .table-mobile-stack td:before {
        content: attr(data-label) ": ";
        font-weight: 600;
        color: var(--gray-600);
        display: inline-block;
        min-width: 100px;
    }
}

/* ============================================
   Modals
   ============================================ */

.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    animation: fadeIn var(--transition-base);
}

.modal-content {
    background-color: #fff;
    margin: 10% auto;
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    width: 90%;
    max-width: 500px;
    box-shadow: var(--shadow-2xl);
    animation: modalAppear var(--transition-base);
    position: relative;
}

@keyframes modalAppear {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(-20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.close {
    color: var(--gray-400);
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    line-height: 1;
    transition: var(--transition-base);
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
}

.close:hover {
    color: var(--gray-900);
    transform: rotate(90deg);
}

#notification-message {
    text-align: center;
    font-size: 1rem;
    color: var(--gray-900);
    margin-top: var(--spacing-md);
}

.success-notification {
    color: var(--success);
    background-color: #d1fae5;
    border: 2px solid var(--success);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
}

/* ============================================
   Status Indicators
   ============================================ */

.status {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    display: inline-block;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.status-active {
    background-color: #d1fae5;
    color: #065f46;
    border: 1px solid var(--success);
}

.status-inactive {
    background-color: #fee2e2;
    color: #991b1b;
    border: 1px solid var(--danger);
}

.status-pending {
    background-color: #fef3c7;
    color: #92400e;
    border: 1px solid var(--warning);
}

.status-completed {
    background-color: #d1fae5;
    color: #065f46;
    border: 1px solid var(--success);
}

/* ============================================
   Loading Spinner
   ============================================ */

.loading {
    display: inline-block;
    width: 24px;
    height: 24px;
    border: 3px solid var(--gray-200);
    border-top: 3px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 300px;
    gap: var(--spacing-lg);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--gray-200);
    border-top: 4px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* ============================================
   Copy Text & Buttons
   ============================================ */

.copy-text {
    background: var(--gray-50);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--gray-300);
    font-family: 'Courier New', monospace;
    word-break: break-all;
    margin: var(--spacing-sm) 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.copy-text span {
    flex: 1;
    min-width: 0;
    font-size: 0.9rem;
    color: var(--gray-900);
}

.copy-button {
    background: var(--success);
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 600;
    transition: var(--transition-base);
    white-space: nowrap;
    flex-shrink: 0;
}

.copy-button:hover {
    background: #059669;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.copy-button:active {
    transform: translateY(0) scale(0.98);
}

@media (max-width: 575.98px) {
    .copy-text {
        flex-direction: column;
        align-items: stretch;
    }
    
    .copy-text span {
        font-size: 0.875rem;
        margin-bottom: var(--spacing-sm);
    }
    
    .copy-button {
        width: 100%;
        margin-left: 0;
        margin-top: var(--spacing-sm);
    }
}

/* ============================================
   Grid System
   ============================================ */

.row {
    display: flex;
    flex-wrap: wrap;
    margin: calc(-1 * var(--spacing-sm));
}

.col-md-3,
.col-md-6 {
    padding: var(--spacing-sm);
}

.col-md-6 {
    flex: 0 0 50%;
    max-width: 50%;
}

.col-md-3 {
    flex: 0 0 25%;
    max-width: 25%;
}

@media (max-width: 768px) {
    .col-md-6,
    .col-md-3 {
        flex: 0 0 100%;
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    .col-md-3 {
        flex: 0 0 100%;
        max-width: 100%;
    }
}

/* ============================================
   Alerts & Notifications
   ============================================ */

.alert {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    border-left: 4px solid;
    animation: slideInRight var(--transition-base);
}

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

.alert-success {
    background-color: #d1fae5;
    color: #065f46;
    border-left-color: var(--success);
}

.alert-danger {
    background-color: #fee2e2;
    color: #991b1b;
    border-left-color: var(--danger);
}

.alert-warning {
    background-color: #fef3c7;
    color: #92400e;
    border-left-color: var(--warning);
}

.alert-info {
    background-color: #dbeafe;
    color: #1e40af;
    border-left-color: var(--info);
}

.alert-heading {
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

/* ============================================
   Utility Classes
   ============================================ */

.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }

/* ============================================
   Accessibility
   ============================================ */

*:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* Prevent text selection on UI elements */
.user-mobile-toggle,
.user-mobile-toggle-inline,
.menu-item {
    -webkit-user-select: none;
    user-select: none;
}

/* ============================================
   Print Styles
   ============================================ */

@media print {
    .left-column,
    .user-mobile-toggle,
    .user-mobile-toggle-inline,
    .user-header-mobile {
        display: none;
    }
    
    .right-column {
        width: 100%;
        padding: 0;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid var(--gray-300);
    }
}