styles.css

/* ===================================
   Vehicle Maintenance Management System
   Complete CSS Stylesheet
   =================================== */

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

html, body {
    height: 100%;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: #333;
    background-color: #f5f7fa;
    overflow-x: hidden;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: #c1c1c1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #a8a8a8;
}

/* ===================================
   SIDEBAR NAVIGATION
   =================================== */

.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: 280px;
    height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 0;
    z-index: 1000;
    box-shadow: 4px 0 20px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.sidebar.mobile-hidden {
    transform: translateX(-100%);
}

.logo {
    text-align: center;
    padding: 30px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(255, 255, 255, 0.05);
}

.logo h2 {
    font-size: 1.6rem;
    font-weight: 700;
    margin: 0;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.nav-menu {
    list-style: none;
    padding: 20px 0;
    margin: 0;
}

.nav-menu li {
    margin: 0;
}

.nav-link {
    display: block;
    padding: 18px 25px;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: all 0.3s ease;
    font-weight: 500;
    font-size: 1rem;
    position: relative;
    border-left: 4px solid transparent;
}

.nav-link::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 4px;
    background: linear-gradient(135deg, #ff6b6b, #4ecdc4);
    transform: scaleY(0);
    transition: transform 0.3s ease;
}

.nav-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
    padding-left: 35px;
}

.nav-link:hover::before {
    transform: scaleY(1);
}

.nav-link.active {
    background-color: rgba(255, 255, 255, 0.15);
    color: white;
    border-left-color: #4ecdc4;
    font-weight: 600;
}

.nav-link.active::before {
    transform: scaleY(1);
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 1001;
    background: #667eea;
    color: white;
    border: none;
    padding: 12px;
    border-radius: 8px;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transition: all 0.3s ease;
}

.menu-toggle:hover {
    background: #5a6fd8;
    transform: translateY(-2px);
}

/* ===================================
   MAIN CONTENT AREA
   =================================== */

.main-content {
    margin-left: 280px;
    padding: 40px;
    min-height: 100vh;
    background: #f5f7fa;
    transition: margin-left 0.3s ease;
}

/* ===================================
   PAGE MANAGEMENT
   =================================== */

.page {
    display: none;
    animation: fadeIn 0.4s ease-in-out;
}

.page.active {
    display: block;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 2px solid #e1e8ed;
}

.page-header h1 {
    color: #2d3748;
    font-size: 2.5rem;
    font-weight: 700;
    margin: 0;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.page-controls {
    display: flex;
    gap: 15px;
    align-items: center;
    flex-wrap: wrap;
}

/* ===================================
   DASHBOARD STYLES
   =================================== */

.dashboard-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin-bottom: 50px;
}

.card {
    background: white;
    padding: 30px;
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.8);
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(135deg, #667eea, #764ba2);
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.12);
}

.card.overdue::before {
    background: linear-gradient(135deg, #ff6b6b, #ee5a52);
}

.card.upcoming::before {
    background: linear-gradient(135deg, #ffa726, #ff7043);
}

.card h3 {
    color: #718096;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    margin-bottom: 15px;
    font-weight: 600;
}

.card .stat {
    font-size: 3rem;
    font-weight: 800;
    color: #2d3748;
    margin: 10px 0;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.card.overdue .stat {
    color: #e53e3e;
}

.card.upcoming .stat {
    color: #ff7043;
}

/* Alerts Section */
.alerts-section {
    background: white;
    border-radius: 16px;
    padding: 35px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.8);
}

.alerts-section h2 {
    color: #2d3748;
    margin-bottom: 25px;
    font-size: 1.5rem;
    font-weight: 600;
}

.alert-item {
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 20px;
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

.alert-item:hover {
    transform: translateX(8px);
}

.alert-item.overdue {
    background: linear-gradient(135deg, #fed7d7, #feb2b2);
    border-left: 5px solid #e53e3e;
    color: #742a2a;
}

.alert-item.upcoming {
    background: linear-gradient(135deg, #feebc8, #fbd38d);
    border-left: 5px solid #ff7043;
    color: #7b341e;
}

.alert-icon {
    font-size: 1.5rem;
    min-width: 24px;
}

.alert-content h4 {
    margin-bottom: 8px;
    font-weight: 600;
    font-size: 1.1rem;
}

.alert-content p {
    font-size: 0.95rem;
    opacity: 0.8;
}

.no-alerts {
    text-align: center;
    color: #a0aec0;
    font-style: italic;
    font-size: 1.1rem;
    padding: 40px 0;
}

/* ===================================
   TABLE STYLES
   =================================== */

.table-container {
    background: white;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.8);
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

th, td {
    padding: 18px 20px;
    text-align: left;
    border-bottom: 1px solid #e2e8f0;
}

th {
    background: linear-gradient(135deg, #f7fafc, #edf2f7);
    font-weight: 600;
    color: #4a5568;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    border-bottom: 2px solid #e2e8f0;
}

tbody tr {
    transition: all 0.3s ease;
}

tbody tr:hover {
    background: linear-gradient(135deg, #f0fff4, #f7fafc);
    transform: scale(1.01);
}

.no-data {
    text-align: center;
    color: #a0aec0;
    font-style: italic;
    padding: 60px 20px;
    font-size: 1.1rem;
}

/* ===================================
   BUTTON STYLES
   =================================== */

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    display: inline-block;
    transition: all 0.3s ease;
    min-width: 120px;
    text-align: center;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s ease;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #5a6fd8, #6a4190);
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(102, 126, 234, 0.3);
}

.btn-secondary {
    background: linear-gradient(135deg, #a0aec0, #718096);
    color: white;
}

.btn-secondary:hover {
    background: linear-gradient(135deg, #8fa4b3, #5f6c81);
    transform: translateY(-3px);
}

.btn-danger {
    background: linear-gradient(135deg, #ff6b6b, #ee5a52);
    color: white;
}

.btn-danger:hover {
    background: linear-gradient(135deg, #ff5252, #e04848);
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(255, 107, 107, 0.3);
}

.btn-warning {
    background: linear-gradient(135deg, #ffa726, #ff7043);
    color: white;
}

.btn-warning:hover {
    background: linear-gradient(135deg, #ff9800, #ff5722);
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(255, 167, 38, 0.3);
}

.btn-small {
    padding: 8px 16px;
    font-size: 0.85rem;
    min-width: 90px;
    border-radius: 8px;
}

.btn:disabled {
    background: #e2e8f0;
    color: #a0aec0;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn:disabled:hover {
    transform: none;
}

.action-buttons {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

/* ===================================
   MODAL STYLES
   =================================== */

.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    animation: fadeIn 0.3s ease;
}

.modal-content {
    background: white;
    margin: 3% auto;
    border-radius: 20px;
    width: 90%;
    max-width: 600px;
    box-shadow: 0 20px 80px rgba(0, 0, 0, 0.2);
    animation: slideInUp 0.4s ease;
    overflow: hidden;
    position: relative;
}

.modal-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(135deg, #667eea, #764ba2);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 25px 30px;
    background: linear-gradient(135deg, #f8fafc, #e2e8f0);
    border-bottom: 1px solid #e2e8f0;
}

.modal-header h2 {
    color: #2d3748;
    font-size: 1.4rem;
    font-weight: 600;
    margin: 0;
}

.close {
    color: #a0aec0;
    font-size: 32px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.close:hover {
    color: #e53e3e;
    background: rgba(229, 62, 62, 0.1);
    transform: rotate(90deg);
}

/* ===================================
   FORM STYLES
   =================================== */

form {
    padding: 30px;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    color: #2d3748;
    font-size: 1rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: #f7fafc;
    color: #2d3748;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
    background: white;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    transform: translateY(-2px);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
    font-family: inherit;
}

.form-group small {
    display: block;
    margin-top: 8px;
    color: #718096;
    font-size: 0.9rem;
    line-height: 1.4;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 15px;
    margin-top: 30px;
    padding-top: 25px;
    border-top: 1px solid #e2e8f0;
}

/* ===================================
   CONFIG PAGE STYLES
   =================================== */

.config-container {
    max-width: 700px;
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.8);
    position: relative;
    overflow: hidden;
}

.config-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(135deg, #667eea, #764ba2);
}

.config-actions {
    display: flex;
    gap: 20px;
    justify-content: flex-end;
    margin-top: 40px;
    flex-wrap: wrap;
}

.config-help {
    margin-top: 40px;
    padding: 30px;
    background: linear-gradient(135deg, #f0fff4, #e6fffa);
    border-radius: 16px;
    border-left: 5px solid #48bb78;
    position: relative;
}

.config-help::before {
    content: '💡';
    position: absolute;
    top: 20px;
    left: 20px;
    font-size: 1.5rem;
}

.config-help h3 {
    color: #2d3748;
    margin-bottom: 20px;
    font-size: 1.2rem;
    padding-left: 40px;
}

.config-help ol {
    margin-left: 40px;
    color: #4a5568;
}

.config-help li {
    margin-bottom: 12px;
    line-height: 1.6;
    padding-left: 10px;
}

/* ===================================
   STATUS MESSAGES
   =================================== */

.status-message {
    padding: 20px 25px;
    border-radius: 12px;
    margin-top: 25px;
    font-weight: 500;
    border: 1px solid transparent;
    display: flex;
    align-items: center;
    gap: 15px;
}

.status-message::before {
    font-size: 1.2rem;
}

.status-message.success {
    background: linear-gradient(135deg, #f0fff4, #c6f6d5);
    color: #22543d;
    border-color: #9ae6b4;
}

.status-message.success::before {
    content: '✅';
}

.status-message.error {
    background: linear-gradient(135deg, #fed7d7, #feb2b2);
    color: #742a2a;
    border-color: #fc8181;
}

.status-message.error::before {
    content: '❌';
}

.status-message.info {
    background: linear-gradient(135deg, #bee3f8, #90cdf4);
    color: #2a4365;
    border-color: #63b3ed;
}

.status-message.info::before {
    content: 'ℹ️';
}

/* ===================================
   LOADING OVERLAY
   =================================== */

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 3000;
    animation: fadeIn 0.3s ease;
}

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

.spinner {
    border: 4px solid #f3f4f6;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

.loading-spinner p {
    color: #4a5568;
    font-weight: 500;
    font-size: 1.1rem;
}

/* ===================================
   TOAST NOTIFICATIONS
   =================================== */

.toast-container {
    position: fixed;
    top: 30px;
    right: 30px;
    z-index: 4000;
    max-width: 400px;
}

.toast {
    background: white;
    border-radius: 12px;
    padding: 20px 25px;
    margin-bottom: 15px;
    box-shadow: 0 12px 48px rgba(0, 0, 0, 0.15);
    border-left: 5px solid #667eea;
    animation: slideInRight 0.4s ease;
    position: relative;
    overflow: hidden;
    cursor: pointer;
    transition: all 0.3s ease;
}

.toast:hover {
    transform: translateX(-5px);
}

.toast::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 5px;
    height: 100%;
    background: linear-gradient(135deg, #667eea, #764ba2);
}

.toast.success {
    border-left-color: #48bb78;
}

.toast.success::before {
    background: linear-gradient(135deg, #48bb78, #38a169);
}

.toast.error {
    border-left-color: #e53e3e;
}

.toast.error::before {
    background: linear-gradient(135deg, #e53e3e, #c53030);
}

.toast.warning {
    border-left-color: #ed8936;
}

.toast.warning::before {
    background: linear-gradient(135deg, #ed8936, #dd6b20);
}

.toast-title {
    font-weight: 600;
    margin-bottom: 8px;
    color: #2d3748;
    font-size: 1rem;
}

.toast-message {
    color: #4a5568;
    font-size: 0.95rem;
    line-height: 1.4;
}

/* ===================================
   ANIMATIONS
   =================================== */

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

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

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

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

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

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

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

.text-success {
    color: #48bb78;
}

.text-danger {
    color: #e53e3e;
}

.text-warning {
    color: #ed8936;
}

.text-info {
    color: #4299e1;
}

.text-muted {
    color: #a0aec0;
}

.bg-success {
    background-color: #48bb78;
}

.bg-danger {
    background-color: #e53e3e;
}

.bg-warning {
    background-color: #ed8936;
}

.bg-info {
    background-color: #4299e1;
}

.mb-0 {
    margin-bottom: 0;
}

.mt-10 {
    margin-top: 10px;
}

.mt-20 {
    margin-top: 20px;
}

.p-0 {
    padding: 0;
}

.hidden {
    display: none;
}

.visible {
    display: block;
}

.flex {
    display: flex;
}

.flex-center {
    display: flex;
    justify-content: center;
    align-items: center;
}

.flex-between {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.w-full {
    width: 100%;
}

.h-full {
    height: 100%;
}

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

@media (max-width: 1200px) {
    .main-content {
        padding: 30px;
    }
    
    .dashboard-cards {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 20px;
    }
}

@media (max-width: 992px) {
    .menu-toggle {
        display: block;
    }
    
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.mobile-open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
        padding: 80px 25px 25px;
    }
    
    .page-header {
        flex-direction: column;
        align-items: stretch;
        gap: 20px;
        text-align: center;
    }
    
    .page-header h1 {
        font-size: 2rem;
    }
    
    .page-controls {
        justify-content: center;
    }
    
    .modal-content {
        margin: 5% auto;
        width: 95%;
    }
    
    .config-actions {
        flex-direction: column;
    }
    
    .action-buttons {
        flex-direction: column;
        gap: 10px;
    }
    
    .btn {
        width: 100%;
    }
    
    .btn-small {
        min-width: auto;
    }
    
    .toast-container {
        right: 15px;
        left: 15px;
        max-width: none;
    }
}

@media (max-width: 768px) {
    .main-content {
        padding: 80px 20px 20px;
    }
    
    .dashboard-cards {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .card {
        padding: 25px 20px;
    }
    
    .card .stat {
        font-size: 2.5rem;
    }
    
    .alerts-section {
        padding: 25px 20px;
    }
    
    .alert-item {
        padding: 15px;
        gap: 15px;
    }
    
    th, td {
        padding: 12px 10px;
        font-size: 0.9rem;
    }
    
    .table-container {
        overflow-x: auto;
    }
    
    table {
        min-width: 600px;
    }
    
    form {
        padding: 25px 20px;
    }
    
    .modal-header {
        padding: 20px 25px;
    }
    
    .modal-header h2 {
        font-size: 1.3rem;
    }
    
    .config-container {
        padding: 30px 25px;
    }
    
    .config-help {
        padding: 25px 20px;
    }
}

@media (max-width: 480px) {
    .main-content {
        padding: 80px 15px 15px;
    }
    
    .page-header h1 {
        font-size: 1.8rem;
    }
    
    .card .stat {
        font-size: 2rem;
    }
    
    th, td {
        padding: 10px 8px;
        font-size: 0.85rem;
    }
    
    .btn {
        padding: 10px 16px;
        font-size: 0.9rem;
        min-width: 100px;
    }
    
    .btn-small {
        padding: 8px 12px;
        font-size: 0.8rem;
    }
    
    .modal-content {
        margin: 2% auto;
        width: 98%;
        border-radius: 12px;
    }
    
    .modal-header {
        padding: 15px 20px;
    }
    
    .modal-header h2 {
        font-size: 1.2rem;
    }
    
    form {
        padding: 20px 15px;
    }
    
    .form-group input,
    .form-group select,
    .form-group textarea {
        padding: 12px 15px;
        font-size: 0.95rem;
    }
    
    .config-container {
        padding: 25px 20px;
    }
    
    .config-help {
        padding: 20px 15px;
    }
    
    .config-help h3 {
        font-size: 1.1rem;
        padding-left: 35px;
    }
    
    .config-help ol {
        margin-left: 35px;
    }
    
    .alerts-section {
        padding: 20px 15px;
    }
    
    .alert-item {
        padding: 12px;
        gap: 12px;
        flex-direction: column;
        text-align: center;
    }
    
    .alert-content h4 {
        font-size: 1rem;
    }
    
    .alert-content p {
        font-size: 0.9rem;
    }
    
    .toast {
        padding: 15px 20px;
        margin-bottom: 10px;
    }
    
    .toast-title {
        font-size: 0.95rem;
    }
    
    .toast-message {
        font-size: 0.9rem;
    }
}

/* ===================================
   PRINT STYLES
   =================================== */

@media print {
    .sidebar,
    .menu-toggle,
    .btn,
    .modal,
    .loading-overlay,
    .toast-container {
        display: none !important;
    }
    
    .main-content {
        margin-left: 0;
        padding: 0;
        background: white;
    }
    
    .page {
        display: block !important;
    }
    
    .page:not(.active) {
        display: none !important;
    }
    
    .card {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ddd;
    }
    
    .table-container {
        box-shadow: none;
        border: 1px solid #ddd;
    }
    
    .alerts-section {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}

/* ===================================
   DARK MODE SUPPORT (Optional)
   =================================== */

@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #1a202c;
        --bg-secondary: #2d3748;
        --text-primary: #f7fafc;
        --text-secondary: #e2e8f0;
        --border-color: #4a5568;
    }
    
    /* Uncomment below to enable dark mode */
    /*
    body {
        background-color: var(--bg-primary);
        color: var(--text-primary);
    }
    
    .card,
    .table-container,
    .alerts-section,
    .modal-content,
    .config-container {
        background-color: var(--bg-secondary);
        border-color: var(--border-color);
        color: var(--text-primary);
    }
    
    th {
        background: #374151;
        color: var(--text-secondary);
    }
    
    .form-group input,
    .form-group select,
    .form-group textarea {
        background-color: var(--bg-primary);
        border-color: var(--border-color);
        color: var(--text-primary);
    }
    
    .form-group input:focus,
    .form-group select:focus,
    .form-group textarea:focus {
        background-color: var(--bg-secondary);
    }
    */
}

/* ===================================
   ACCESSIBILITY IMPROVEMENTS
   =================================== */

/* Focus indicators */
button:focus,
input:focus,
select:focus,
textarea:focus,
.nav-link:focus {
    outline: 3px solid rgba(102, 126, 234, 0.5);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .btn-primary {
        background: #000;
        border: 2px solid #fff;
    }
    
    .btn-secondary {
        background: #666;
        border: 2px solid #fff;
    }
    
    .card {
        border: 2px solid #333;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .btn:hover {
        transform: none;
    }
    
    .card:hover {
        transform: none;
    }
}

/* ===================================
   CUSTOM SCROLLBAR FOR WEBKIT
   =================================== */

.sidebar::-webkit-scrollbar {
    width: 6px;
}

.sidebar::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.1);
}

.sidebar::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.3);
    border-radius: 3px;
}

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

/* ===================================
   ADDITIONAL COMPONENT STYLES
   =================================== */

/* Loading states for buttons */
.btn.loading {
    position: relative;
    color: transparent;
    pointer-events: none;
}

.btn.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

/* Badges and indicators */
.badge {
    display: inline-block;
    padding: 4px 8px;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-success {
    background-color: #c6f6d5;
    color: #22543d;
}

.badge-danger {
    background-color: #fed7d7;
    color: #742a2a;
}

.badge-warning {
    background-color: #feebc8;
    color: #7b341e;
}

.badge-info {
    background-color: #bee3f8;
    color: #2a4365;
}

/* Empty states */
.empty-state {
    text-align: center;
    padding: 60px 40px;
    color: #a0aec0;
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: 20px;
    opacity: 0.5;
}

.empty-state-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: #4a5568;
}

.empty-state-description {
    font-size: 1rem;
    line-height: 1.6;
    max-width: 400px;
    margin: 0 auto;
}

/* Progress indicators */
.progress {
    width: 100%;
    height: 8px;
    background-color: #e2e8f0;
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 4px;
    transition: width 0.3s ease;
}

/* Tooltips */
.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip::before {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    background-color: #2d3748;
    color: white;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.85rem;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
}

.tooltip::after {
    content: '';
    position: absolute;
    bottom: 117%;
    left: 50%;
    transform: translateX(-50%);
    border: 5px solid transparent;
    border-top-color: #2d3748;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.tooltip:hover::before,
.tooltip:hover::after {
    opacity: 1;
    visibility: visible;
}

/* End of VMMS CSS */