:root {
            --primary: #4361ee;
            --primary-dark: #3a56d4;
            --secondary: #7209b7;
            --success: #4cc9f0;
            --danger: #f72585;
            --warning: #f8961e;
            --light: #f8f9fa;
            --dark: #212529;
            --gray: #6c757d;
            --border-radius: 8px;
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        body {
            background-color: #f5f7fb;
            color: var(--dark);
            line-height: 1.6;
        }

        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Header Styles */
        header {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: white;
            padding: 1rem 0;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 100;
        }

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

        .logo {
            font-size: 1.8rem;
            font-weight: 700;
            display: flex;
            align-items: center;
        }

        .logo i {
            margin-right: 10px;
        }

        nav ul {
            display: flex;
            list-style: none;
        }

        nav ul li {
            margin-left: 1.5rem;
        }

        nav ul li a {
            color: white;
            text-decoration: none;
            font-weight: 500;
            padding: 0.5rem 1rem;
            border-radius: var(--border-radius);
            transition: var(--transition);
        }

        nav ul li a:hover, 
        nav ul li a.active {
            background-color: rgba(255, 255, 255, 0.2);
        }

        /* Main Content */
        main {
            padding: 2rem 0;
        }

        .section-title {
            margin-bottom: 2rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--primary);
            color: var(--primary);
        }

        /* Dashboard */
        .dashboard {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 1.5rem;
            margin-bottom: 2rem;
        }

        .stat-card {
            background: white;
            border-radius: var(--border-radius);
            padding: 1.5rem;
            box-shadow: var(--shadow);
            text-align: center;
            transition: var(--transition);
        }

        .stat-card:hover {
            transform: translateY(-5px);
        }

        .stat-card h3 {
            font-size: 2rem;
            color: var(--primary);
            margin-bottom: 0.5rem;
        }

        .stat-card p {
            color: var(--gray);
            font-weight: 500;
        }

        /* Calendar */
        .calendar-container {
            background: white;
            border-radius: var(--border-radius);
            padding: 1.5rem;
            box-shadow: var(--shadow);
            margin-bottom: 2rem;
        }

        .calendar-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 1.5rem;
        }

        .calendar-nav button {
            background: var(--primary);
            color: white;
            border: none;
            padding: 0.5rem 1rem;
            border-radius: var(--border-radius);
            cursor: pointer;
            transition: var(--transition);
            margin: 0 0.5rem;
        }

        .calendar-nav button:hover {
            background: var(--primary-dark);
        }

        .calendar-grid {
            display: grid;
            grid-template-columns: repeat(7, 1fr);
            gap: 5px;
        }

        .calendar-day-header {
            text-align: center;
            font-weight: 600;
            padding: 0.5rem;
            background: var(--light);
            border-radius: var(--border-radius);
        }

        .calendar-day {
            min-height: 100px;
            border: 1px solid #e9ecef;
            padding: 0.5rem;
            border-radius: var(--border-radius);
            transition: var(--transition);
            cursor: pointer;
            position: relative;
        }

        .calendar-day:hover {
            background: var(--light);
        }

        .calendar-day.other-month {
            color: var(--gray);
            background: #f8f9fa;
        }

        .calendar-day.today {
            background: rgba(67, 97, 238, 0.1);
            border: 1px solid var(--primary);
        }

        .day-number {
            font-weight: 600;
            margin-bottom: 0.5rem;
        }

        .appointment-badge {
            background: var(--success);
            color: white;
            font-size: 0.7rem;
            padding: 2px 6px;
            border-radius: 10px;
            position: absolute;
            bottom: 5px;
            right: 5px;
        }

        /* Forms */
        .form-container {
            background: white;
            border-radius: var(--border-radius);
            padding: 1.5rem;
            box-shadow: var(--shadow);
            margin-bottom: 2rem;
        }

        .form-group {
            margin-bottom: 1.5rem;
        }

        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 500;
        }

        .form-control {
            width: 100%;
            padding: 0.75rem;
            border: 1px solid #ced4da;
            border-radius: var(--border-radius);
            font-size: 1rem;
            transition: var(--transition);
        }

        .form-control:focus {
            border-color: var(--primary);
            outline: none;
            box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.25);
        }

        .btn {
            display: inline-block;
            padding: 0.75rem 1.5rem;
            background: var(--primary);
            color: white;
            border: none;
            border-radius: var(--border-radius);
            font-size: 1rem;
            font-weight: 500;
            cursor: pointer;
            transition: var(--transition);
            text-align: center;
        }

        .btn:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
        }

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

        .btn-secondary:hover {
            background: #6511a0;
        }

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

        .btn-success:hover {
            background: #3ab3d6;
        }

        .btn-danger {
            background: var(--danger);
        }

        .btn-danger:hover {
            background: #e11573;
        }

        /* Tabs */
        .tabs {
            display: flex;
            border-bottom: 1px solid #dee2e6;
            margin-bottom: 1.5rem;
        }

        .tab {
            padding: 0.75rem 1.5rem;
            cursor: pointer;
            border-bottom: 3px solid transparent;
            transition: var(--transition);
        }

        .tab.active {
            border-bottom: 3px solid var(--primary);
            color: var(--primary);
            font-weight: 600;
        }

        .tab-content {
            display: none;
        }

        .tab-content.active {
            display: block;
            animation: fadeIn 0.5s;
        }

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

        /* Tables */
        .table-container {
            overflow-x: auto;
        }

        table {
            width: 100%;
            border-collapse: collapse;
            margin-bottom: 1.5rem;
        }

        th, td {
            padding: 0.75rem;
            text-align: left;
            border-bottom: 1px solid #dee2e6;
        }

        th {
            background: var(--light);
            font-weight: 600;
        }

        tr:hover {
            background: rgba(67, 97, 238, 0.05);
        }

        .status-badge {
            display: inline-block;
            padding: 0.25rem 0.5rem;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 500;
        }

        .status-pending {
            background: rgba(248, 150, 30, 0.2);
            color: var(--warning);
        }

        .status-confirmed {
            background: rgba(76, 201, 240, 0.2);
            color: var(--success);
        }

        .status-cancelled {
            background: rgba(247, 37, 133, 0.2);
            color: var(--danger);
        }

        .status-completed {
            background: rgba(67, 97, 238, 0.2);
            color: var(--primary);
        }

        /* Modal */
        .modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            z-index: 1000;
            align-items: center;
            justify-content: center;
        }

        .modal.active {
            display: flex;
            animation: fadeIn 0.3s;
        }

        .modal-content {
            background: white;
            border-radius: var(--border-radius);
            width: 90%;
            max-width: 500px;
            padding: 2rem;
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
            animation: slideUp 0.3s;
        }

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

        .modal-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 1.5rem;
        }

        .modal-close {
            background: none;
            border: none;
            font-size: 1.5rem;
            cursor: pointer;
            color: var(--gray);
        }

        /* Time Slots */
        .time-slots {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
            gap: 10px;
            margin-top: 1rem;
        }

        .time-slot {
            padding: 0.5rem;
            text-align: center;
            border: 1px solid #dee2e6;
            border-radius: var(--border-radius);
            cursor: pointer;
            transition: var(--transition);
        }

        .time-slot:hover {
            background: var(--light);
        }

        .time-slot.selected {
            background: var(--primary);
            color: white;
            border-color: var(--primary);
        }

        .time-slot.unavailable {
            background: #f8d7da;
            color: #721c24;
            cursor: not-allowed;
        }

        /* Notifications */
        .notification {
            position: fixed;
            top: 20px;
            right: 20px;
            padding: 1rem 1.5rem;
            border-radius: var(--border-radius);
            color: white;
            box-shadow: var(--shadow);
            z-index: 1100;
            display: flex;
            align-items: center;
            animation: slideInRight 0.3s, fadeOut 0.3s 2.7s forwards;
        }

        .notification.success {
            background: var(--success);
        }

        .notification.error {
            background: var(--danger);
        }

        .notification.warning {
            background: var(--warning);
        }

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

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

        /* Responsive */
        @media (max-width: 768px) {
            .header-content {
                flex-direction: column;
            }

            nav ul {
                margin-top: 1rem;
                flex-wrap: wrap;
                justify-content: center;
            }

            nav ul li {
                margin: 0.25rem;
            }

            .dashboard {
                grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            }

            .calendar-day {
                min-height: 80px;
            }

            .tabs {
                flex-wrap: wrap;
            }
        }

        /* Loading Spinner */
        .spinner {
            display: inline-block;
            width: 20px;
            height: 20px;
            border: 3px solid rgba(255, 255, 255, 0.3);
            border-radius: 50%;
            border-top-color: white;
            animation: spin 1s ease-in-out infinite;
        }

        @keyframes spin {
            to { transform: rotate(360deg); }
        }