/* Custom SweetAlert2 Dark Theme */
        .swal2-popup {
            background: #1e293b !important;
            border: 2px solid #334155 !important;
            border-radius: 24px !important;
            padding: 30px !important;
        }
        
        .swal2-title {
            color: #f1f5f9 !important;
            font-family: 'Inter', sans-serif !important;
            font-weight: 800 !important;
            font-size: 28px !important;
        }
        
        .swal2-html-container {
            color: #cbd5e1 !important;
            font-family: 'Inter', sans-serif !important;
            font-size: 16px !important;
            line-height: 1.6 !important;
        }
        
        .swal2-confirm {
            background: linear-gradient(135deg, #1a56db, #6366f1) !important;
            border-radius: 12px !important;
            padding: 12px 32px !important;
            font-weight: 700 !important;
            font-size: 16px !important;
            box-shadow: 0 4px 12px rgba(26, 86, 219, 0.4) !important;
        }
        
        .swal2-confirm:hover {
            transform: translateY(-2px) !important;
            box-shadow: 0 6px 16px rgba(26, 86, 219, 0.5) !important;
        }
        
        .swal2-cancel {
            background: #334155 !important;
            border-radius: 12px !important;
            padding: 12px 32px !important;
            font-weight: 700 !important;
            font-size: 16px !important;
        }
        
        .swal2-icon {
            border-width: 3px !important;
        }
        
        .swal2-timer-progress-bar {
            background: linear-gradient(90deg, #1a56db, #6366f1) !important;
        }
        
        :root {
            --primary-color: #1a56db;
            --primary-hover: #1e429f;
            --secondary-color: #6366f1;
            --success-color: #10b981;
            --danger-color: #ef4444;
            --warning-color: #f59e0b;
            --info-color: #3b82f6;
            --dark-bg: #0f172a;
            --darker-bg: #020617;
            --card-bg: #1e293b;
            --border-color: #334155;
            --text-primary: #f1f5f9;
            --text-secondary: #94a3b8;
            --text-muted: #64748b;
        }

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

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
            background: var(--darker-bg);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 20px;
            position: relative;
            overflow-x: hidden;
        }

        body::before {
            content: '';
            position: absolute;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(26, 86, 219, 0.15), transparent);
            border-radius: 50%;
            top: -250px;
            right: -250px;
            animation: float 20s infinite ease-in-out;
        }

        body::after {
            content: '';
            position: absolute;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(99, 102, 241, 0.1), transparent);
            border-radius: 50%;
            bottom: -200px;
            left: -200px;
            animation: float 25s infinite ease-in-out reverse;
        }

        @keyframes float {
            0%, 100% { transform: translateY(0) rotate(0deg); }
            50% { transform: translateY(20px) rotate(5deg); }
        }

        .container {
            max-width: 600px;
            width: 100%;
            position: relative;
            z-index: 1;
        }

        .auth-card {
            background: var(--dark-bg);
            border-radius: 32px;
            padding: 60px 50px;
            box-shadow: 0 25px 80px rgba(0, 0, 0, 0.6);
            border: 2px solid var(--border-color);
            position: relative;
            overflow: hidden;
        }

        .auth-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 6px;
            background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
        }

        .logo-container {
            text-align: center;
            margin-bottom: 40px;
        }

        .logo-icon {
            width: 100px;
            height: 100px;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 25px;
            box-shadow: 0 10px 20px rgba(26, 86, 219, 0.5);
            animation: pulse 2s infinite;
        }

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

        .logo-icon i {
            font-size: 48px;
            color: var(--text-primary);
        }

        h1 {
            font-size: 42px;
            font-weight: 900;
            color: var(--text-primary);
            margin-bottom: 10px;
            letter-spacing: -1px;
        }

        .subtitle {
            color: var(--text-secondary);
            font-size: 17px;
            font-weight: 600;
        }

        .form-group {
            margin-bottom: 24px;
        }

        label {
            display: block;
            margin-bottom: 12px;
            font-weight: 700;
            color: var(--text-primary);
            font-size: 16px;
            letter-spacing: 0.3px;
        }

        label i {
            margin-right: 10px;
            color: var(--secondary-color);
            width: 18px;
            text-align: center;
            font-size: 18px;
        }

        input, select {
            width: 100%;
            padding: 18px 20px;
            border: 2px solid var(--border-color);
            border-radius: 14px;
            font-size: 16px;
            font-family: inherit;
            transition: all 0.3s ease;
            background: var(--card-bg);
            color: var(--text-primary);
            font-weight: 500;
        }

        input:focus, select:focus {
            outline: none;
            border-color: var(--secondary-color);
            background: var(--dark-bg);
            box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
        }

        input::placeholder {
            color: var(--text-muted);
        }

        input.valid {
            border-color: var(--success-color);
            background: rgba(16, 185, 129, 0.05);
        }

        input.invalid {
            border-color: var(--danger-color);
            background: rgba(239, 68, 68, 0.05);
        }

        .password-field {
            position: relative;
        }

        .password-toggle {
            position: absolute;
            right: 16px;
            top: 50%;
            transform: translateY(-50%);
            cursor: pointer;
            color: var(--text-secondary);
            transition: color 0.3s;
        }

        .password-toggle:hover {
            color: var(--secondary-color);
        }

        .username-feedback {
            margin-top: 8px;
            font-size: 13px;
            font-weight: 500;
            padding: 8px 12px;
            border-radius: 8px;
            display: none;
        }

        .username-feedback.available {
            display: block;
            color: var(--success-color);
            background: rgba(16, 185, 129, 0.1);
            border-left: 3px solid var(--success-color);
        }

        .username-feedback.taken {
            display: block;
            color: var(--danger-color);
            background: rgba(239, 68, 68, 0.1);
            border-left: 3px solid var(--danger-color);
        }

        .username-feedback.checking {
            display: block;
            color: var(--text-secondary);
            background: rgba(148, 163, 184, 0.1);
            border-left: 3px solid var(--text-secondary);
        }

        .submit-btn {
            width: 100%;
            padding: 20px;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: var(--text-primary);
            border: none;
            border-radius: 14px;
            font-size: 18px;
            font-weight: 800;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 6px 16px rgba(26, 86, 219, 0.5);
            letter-spacing: 1px;
            text-transform: uppercase;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 12px;
        }

        .submit-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 24px rgba(26, 86, 219, 0.6);
        }

        .submit-btn:active {
            transform: translateY(0);
        }

        .auth-links {
            text-align: center;
            margin-top: 32px;
            padding-top: 24px;
            border-top: 1px solid var(--border-color);
        }

        .auth-links a {
            color: var(--secondary-color);
            text-decoration: none;
            font-weight: 700;
            font-size: 16px;
            transition: all 0.3s;
            position: relative;
        }

        .auth-links a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--secondary-color);
            transition: width 0.3s;
        }

        .auth-links a:hover::after {
            width: 100%;
        }

        .auth-links p {
            color: var(--text-secondary);
            margin-bottom: 16px;
            font-size: 16px;
            font-weight: 500;
        }

        .auth-link {
            text-align: center;
            padding-top: 24px;
        }

        .auth-link a {
            color: var(--secondary-color);
            text-decoration: none;
            font-weight: 700;
            font-size: 16px;
            transition: all 0.3s;
            position: relative;
        }

        .auth-link a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--secondary-color);
            transition: width 0.3s;
        }

        .auth-link a:hover::after {
            width: 100%;
        }

        .auth-link p {
            color: var(--text-secondary);
            margin-bottom: 16px;
            font-size: 16px;
            font-weight: 500;
        }

        .role-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
            margin-top: 32px;
        }

        .role-card {
            background: var(--card-bg);
            border: 2px solid var(--border-color);
            border-radius: 20px;
            padding: 32px 20px;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .role-card:hover {
            transform: translateY(-6px);
            border-color: var(--secondary-color);
            background: var(--dark-bg);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.4);
        }

        .role-card i {
            font-size: 48px;
            margin-bottom: 16px;
            color: var(--secondary-color);
        }

        .role-card h3 {
            font-size: 16px;
            font-weight: 800;
            color: var(--text-primary);
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        .alert {
            padding: 16px 20px;
            border-radius: 12px;
            margin-bottom: 24px;
            font-size: 14px;
            font-weight: 500;
            display: flex;
            align-items: flex-start;
            gap: 12px;
            animation: slideIn 0.3s ease;
            line-height: 1.6;
        }

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

        .alert-success {
            background: rgba(16, 185, 129, 0.1);
            color: var(--success-color);
            border-left: 4px solid var(--success-color);
        }

        .alert-error {
            background: rgba(239, 68, 68, 0.1);
            color: var(--danger-color);
            border-left: 4px solid var(--danger-color);
        }

        .alert i {
            font-size: 18px;
            margin-top: 2px;
        }

        .modal {
            display: none;
            position: fixed;
            z-index: 1000;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.8);
            backdrop-filter: blur(4px);
            animation: fadeIn 0.3s ease;
        }

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

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

        .modal-content {
            background-color: var(--dark-bg);
            border-radius: 32px;
            box-shadow: 0 25px 80px rgba(0, 0, 0, 0.6);
            border: 2px solid var(--border-color);
            max-width: 650px;
            width: 90%;
            max-height: 90vh;
            overflow-y: auto;
            animation: slideUp 0.3s ease;
            position: relative;
        }

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

        .modal-content::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 6px;
            background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
            border-radius: 32px 32px 0 0;
        }

        .modal-header {
            padding: 40px 40px 28px;
            text-align: center;
        }

        .modal-header h2 {
            font-size: 32px;
            font-weight: 900;
            color: var(--text-primary);
            margin-bottom: 10px;
            letter-spacing: -1px;
        }

        .modal-header p {
            color: var(--text-secondary);
            font-size: 16px;
            font-weight: 500;
        }

        .modal-body {
            padding: 0 40px 40px;
        }

        .close {
            position: absolute;
            right: 20px;
            top: 20px;
            width: 36px;
            height: 36px;
            background: var(--card-bg);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all 0.3s;
            z-index: 1;
            color: var(--text-secondary);
            font-size: 20px;
        }

        .close:hover {
            background: var(--danger-color);
            color: var(--text-primary);
            transform: rotate(90deg);
        }

        .modal-footer {
            margin-top: 24px;
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid var(--border-color);
        }

        .modal-footer a {
            color: var(--text-secondary);
            text-decoration: none;
            font-size: 14px;
            font-weight: 600;
            transition: color 0.3s;
        }

        .modal-footer a:hover {
            color: var(--secondary-color);
        }

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

        ::-webkit-scrollbar-track {
            background: var(--card-bg);
        }

        ::-webkit-scrollbar-thumb {
            background: var(--border-color);
            border-radius: 4px;
        }

        ::-webkit-scrollbar-thumb:hover {
            background: var(--secondary-color);
        }

        @media (max-width: 768px) {
            .auth-card {
                padding: 40px 30px;
            }

            h1 {
                font-size: 36px;
            }

            .logo-icon {
                width: 90px;
                height: 90px;
            }

            .logo-icon i {
                font-size: 42px;
            }

            input, select {
                padding: 16px 18px;
                font-size: 15px;
            }

            .submit-btn {
                padding: 18px;
                font-size: 17px;
            }

            .role-grid {
                grid-template-columns: 1fr;
            }

            .modal-content {
                width: 95%;
                max-height: 95vh;
                border-radius: 24px;
            }

            .modal-header, .modal-body {
                padding: 28px 24px;
            }

            .modal-header h2 {
                font-size: 26px;
            }

            .container {
                max-width: 95%;
            }
        }