:root {
            --primary-color: #1a56db;
            --secondary-color: #1e429f;
            --accent-color: #3f83f8;
            --success-color: #0e9f6e;
            --warning-color: #f59e0b;
            --danger-color: #e02424;
            --calibration-blue: #1e40af;
            --calibration-light: #3b82f6;
            --calibration-dark: #1e3a8a;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
           font-family: 'Century Gothic', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            color: #334155;
            height: 100vh;
            overflow: hidden;
            position: relative;
        }
        
        #background-container {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: -1;
        }
        
        .login-container {
            width: 100%;
            max-width: 450px;
            padding: 20px;
            position: relative;
            z-index: 10;
            margin: 0 auto;
            height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .login-card {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-radius: 20px;
            box-shadow: 0 25px 50px rgba(0, 0, 0, 0.25);
            overflow: hidden;
            transition: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
            border: 1px solid rgba(255, 255, 255, 0.3);
            width: 100%;
            transform-style: preserve-3d;
            perspective: 1000px;
        }
        
        .login-card:hover {
            transform: translateY(-10px) rotateX(2deg);
            box-shadow: 0 35px 70px rgba(0, 0, 0, 0.3);
        }
        
        .login-header {
            background: linear-gradient(135deg, var(--calibration-dark) 0%, var(--calibration-blue) 100%);
            color: white;
            padding: 35px 30px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        
        .login-header::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0) 70%);
            animation: pulse 8s infinite linear;
        }
        
        .logo-container {
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 15px;
            position: relative;
            z-index: 2;
        }
        
        .logo-icon {
            background: rgba(255, 255, 255, 0.2);
            width: 60px;
            height: 60px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 15px;
            font-size: 1.8rem;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
            transition: all 0.3s ease;
        }
        
        .logo-container:hover .logo-icon {
            transform: rotate(15deg) scale(1.1);
            background: rgba(255, 255, 255, 0.3);
        }
        
        .logo-text {
            font-weight: 700;
            font-size: 1.8rem;
            text-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
        }
        
        .login-subtitle {
            font-size: 1.1rem;
            opacity: 0.9;
            margin-bottom: 0;
            position: relative;
            z-index: 2;
        }
        
        .login-body {
            padding: 35px 30px;
            position: relative;
        }
        
        .form-group {
            margin-bottom: 25px;
            position: relative;
        }
        
        .form-label {
            font-weight: 600;
            color: #374151;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
        }
        
        .form-label i {
            margin-right: 8px;
            color: var(--calibration-blue);
        }
        
        .form-control {
            padding: 15px 20px;
            border: 2px solid #e5e7eb;
            border-radius: 12px;
            font-size: 1rem;
            transition: all 0.3s;
            background: rgba(255, 255, 255, 0.8);
            box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
        }
        
        .form-control:focus {
            border-color: var(--calibration-light);
            box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
            background: white;
            transform: translateY(-2px);
        }
        
        .input-group-text {
            background-color: #f9fafb;
            border: 2px solid #e5e7eb;
            border-right: none;
            border-radius: 12px 0 0 12px;
        }
        
        .input-group .form-control {
            border-left: none;
            border-radius: 0 12px 12px 0;
        }
        
        .btn-login {
            background: linear-gradient(135deg, var(--calibration-blue) 0%, var(--calibration-light) 100%);
            color: white;
            border: none;
            padding: 15px 20px;
            border-radius: 12px;
            font-weight: 600;
            font-size: 1.1rem;
            width: 100%;
            transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
            margin-top: 10px;
            position: relative;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(59, 130, 246, 0.4);
        }
        
        .btn-login::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: all 0.6s;
        }
        
        .btn-login:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 25px rgba(59, 130, 246, 0.6);
        }
        
        .btn-login:hover::before {
            left: 100%;
        }
        
        .btn-login:active {
            transform: translateY(0);
        }
        
        .login-options {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: 20px;
            font-size: 0.9rem;
        }
        
        .form-check-input:checked {
            background-color: var(--calibration-blue);
            border-color: var(--calibration-blue);
        }
        
        .forgot-password {
            color: var(--calibration-blue);
            text-decoration: none;
            font-weight: 500;
            transition: all 0.3s;
            position: relative;
        }
        
        .forgot-password::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--calibration-blue);
            transition: width 0.3s;
        }
        
        .forgot-password:hover {
            text-decoration: none;
        }
        
        .forgot-password:hover::after {
            width: 100%;
        }
        
        .divider {
            display: flex;
            align-items: center;
            margin: 30px 0;
        }
        
        .divider::before,
        .divider::after {
            content: "";
            flex: 1;
            border-bottom: 1px solid #e5e7eb;
        }
        
        .divider-text {
            padding: 0 15px;
            color: #6b7280;
            font-size: 0.9rem;
        }
        
        .login-footer {
            text-align: center;
            padding: 20px;
            background: rgba(249, 250, 251, 0.8);
            border-top: 1px solid rgba(229, 231, 235, 0.5);
            color: #6b7280;
            font-size: 0.85rem;
        }
        
        .alert {
            border-radius: 12px;
            padding: 15px;
            margin-bottom: 20px;
            border: none;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        
        .alert-danger {
            background: rgba(224, 36, 36, 0.1);
            color: var(--danger-color);
            border-left: 4px solid var(--danger-color);
        }
        
        /* Demo credentials box */
        .demo-credentials {
            background: rgba(240, 249, 255, 0.8);
            border: 1px solid rgba(186, 230, 253, 0.5);
            border-radius: 12px;
            padding: 20px;
            margin-top: 25px;
            font-size: 0.85rem;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: all 0.3s;
        }
        
        .demo-credentials:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
        }
        
        .demo-credentials h6 {
            color: var(--calibration-blue);
            margin-bottom: 12px;
            display: flex;
            align-items: center;
        }
        
        .demo-credentials p {
            margin-bottom: 8px;
            color: #475569;
        }
        
        /* Floating particles */
        .particles {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: -1;
        }
        
        .particle {
            position: absolute;
            background: rgba(255, 255, 255, 0.5);
            border-radius: 50%;
            animation: float 15s infinite linear;
        }
        
        /* Animations */
        @keyframes float {
            0% {
                transform: translateY(100vh) rotate(0deg);
                opacity: 0;
            }
            10% {
                opacity: 1;
            }
            90% {
                opacity: 1;
            }
            100% {
                transform: translateY(-100px) rotate(360deg);
                opacity: 0;
            }
        }
        
        @keyframes pulse {
            0% {
                transform: rotate(0deg);
            }
            100% {
                transform: rotate(360deg);
            }
        }
        
        /* Responsive adjustments */
        @media (max-width: 576px) {
            .login-container {
                padding: 15px;
            }
            
            .login-header {
                padding: 25px 20px;
            }
            
            .login-body {
                padding: 25px 20px;
            }
            
            .logo-text {
                font-size: 1.5rem;
            }
            
            .logo-icon {
                width: 50px;
                height: 50px;
                font-size: 1.5rem;
            }
        }
        
        /* Glass morphism effect */
        .glass-effect {
            background: rgba(255, 255, 255, 0.25);
            backdrop-filter: blur(10px);
            border-radius: 20px;
            border: 1px solid rgba(255, 255, 255, 0.18);
            box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
        }