body {
            background: linear-gradient(135deg, #2C3E50 0%, #34495E 100%);
            min-height: 100vh;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        .login-container {
            min-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 20px 40px rgba(0, 0, 0, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.2);
            overflow: hidden;
            max-width: 400px;
            width: 100%;
        }

        .login-header {
            background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
            padding: 2rem;
            text-align: center;
            color: white;
        }

        .logo {
            max-width: 120px;
            height: auto;
            margin-bottom: 1rem;
            filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2));
        }

        .login-title {
            font-size: 1.5rem;
            font-weight: 600;
            margin: 0;
        }

        .login-subtitle {
            font-size: 0.9rem;
            opacity: 0.9;
            margin: 0.5rem 0 0 0;
        }

        .login-body {
            padding: 2rem;
        }

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

        .form-control {
            border: 2px solid #e1e5e9;
            border-radius: 10px;
            transition: all 0.3s ease;
            height: 50px;
            font-size: 16px;
        }

        .form-control:focus {
            border-color: #4facfe;
            box-shadow: 0 0 0 0.2rem rgba(79, 172, 254, 0.25);
        }

        .btn-login {
            background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
            border: none;
            border-radius: 10px;
            padding: 0.75rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            transition: all 0.3s ease;
            width: 100%;
        }

        .btn-login:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 20px rgba(79, 172, 254, 0.3);
        }

        .alert-error {
            background: linear-gradient(135deg, #ff6b6b 0%, #ff8e8e 100%);
            border: none;
            border-radius: 10px;
            color: white;
            margin-bottom: 1rem;
        }

        .input-group-text {
            background: transparent;
            border: 2px solid #e1e5e9;
            border-right: none;
            border-radius: 10px 0 0 10px;
            width: 50px;
            height: 58px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .input-group-text i {
            font-size: 16px;
            color: #6c757d;
        }

        .input-group .form-control {
            border-left: none;
            border-radius: 0 10px 10px 0;
            height: 58px;
            padding: 12px 16px;
        }

        .form-floating > label {
            padding: 1rem 0.75rem;
        }

        .input-group:focus-within .input-group-text {
            border-color: #4facfe;
        }

        .input-group:focus-within .input-group-text i {
            color: #4facfe;
        }

        .floating-particles {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            overflow: hidden;
            z-index: -1;
        }

        .particle {
            position: absolute;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            animation: float 6s ease-in-out infinite;
        }

        @keyframes float {
            0%, 100% { transform: translateY(0px) rotate(0deg); }
            50% { transform: translateY(-20px) rotate(180deg); }
        }