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

        body {
            background: linear-gradient(135deg, #4361ee, #3a0ca3);
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            padding: 20px;
        }

        .container {
            display: flex;
            width: 100%;
            max-width: 900px;
            background: white;
            border-radius: 20px;
            overflow: hidden;
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
        }

        .illustration {
            flex: 1;
            background: linear-gradient(to bottom right, #4361ee, #3a0ca3);
            padding: 40px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            color: white;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .illustration::before {
            content: "";
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
            transform: rotate(30deg);
        }

        .illustration h2 {
            font-size: 2.2rem;
            margin-bottom: 15px;
            font-weight: 700;
            position: relative;
            z-index: 2;
        }

        .illustration p {
            font-size: 1.1rem;
            max-width: 300px;
            margin-bottom: 30px;
            line-height: 1.6;
            position: relative;
            z-index: 2;
        }

        .illustration-img {
            width: 100%;
            max-width: 300px;
            position: relative;
            z-index: 2;
        }

        .form-section {
            flex: 1;
            padding: 50px 40px;
            position: relative;
        }

        .logo {
            text-align: center;
            margin-bottom: 30px;
        }

        .logo h1 {
            font-size: 1.6rem;
            font-weight: 700;
            color: #3a0ca3;
            margin-bottom: 5px;
        }

        .logo .subtitle {
            color: #7f8c8d;
            font-size: 1rem;
        }

        .tabs {
            display: flex;
            background: #f5f7fa;
            border-radius: 50px;
            padding: 5px;
            margin-bottom: 30px;
        }

        .tab {
            flex: 1;
            padding: 12px;
            text-align: center;
            cursor: pointer;
            border-radius: 50px;
            transition: all 0.3s ease;
            font-weight: 600;
            color: #555;
        }

        .tab.active {
            background: #4361ee;
            color: white;
            box-shadow: 0 4px 10px rgba(67, 97, 238, 0.3);
        }

        .form-container {
            display: none;
        }

        .form-container.active {
            display: block;
            animation: fadeIn 0.5s ease;
        }

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

        .form-group {
            position: relative;
            margin-bottom: 20px;
        }

        .form-group i {
            position: absolute;
            left: 15px;
            top: 50%;
            transform: translateY(-50%);
            color: #777;
        }

        input {
            width: 100%;
            padding: 15px 15px 15px 45px;
            border: 1px solid #ddd;
            border-radius: 10px;
            font-size: 1rem;
            transition: all 0.3s ease;
        }

        input:focus {
            outline: none;
            border-color: #4361ee;
            box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.1);
        }

        .forgot-password {
            text-align: right;
            margin: 10px 0 20px;
        }

        .forgot-password a {
            color: #4361ee;
            text-decoration: none;
            font-size: 0.9rem;
            transition: all 0.3s ease;
        }

        .forgot-password a:hover {
            text-decoration: underline;
        }

        button {
            background: linear-gradient(to right, #4361ee, #3a0ca3);
            color: white;
            border: none;
            padding: 15px;
            width: 100%;
            border-radius: 10px;
            cursor: pointer;
            font-size: 1rem;
            font-weight: 600;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        button::after {
            content: "";
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: rgba(255, 255, 255, 0.1);
            transform: rotate(30deg);
            transition: all 0.5s ease;
        }

        button:hover::after {
            transform: rotate(30deg) translate(20px, 20px);
        }

        button:hover {
            transform: translateY(-2px);
            box-shadow: 0 7px 15px rgba(67, 97, 238, 0.3);
        }

        .error {
            background: #ffecec;
            color: #e74c3c;
            padding: 12px;
            border-radius: 8px;
            margin-bottom: 20px;
            font-size: 0.9rem;
            border-left: 4px solid #e74c3c;
            animation: shake 0.5s ease;
        }

        @keyframes shake {
            0%, 100% { transform: translateX(0); }
            25% { transform: translateX(-5px); }
            75% { transform: translateX(5px); }
        }

        .divider {
            display: flex;
            align-items: center;
            margin: 25px 0;
        }

        .divider::before, .divider::after {
            content: "";
            flex: 1;
            height: 1px;
            background: #ddd;
        }

        .divider span {
            padding: 0 15px;
            color: #777;
            font-size: 0.9rem;
        }

        .social-login {
            display: flex;
            justify-content: center;
            gap: 15px;
            margin-top: 20px;
        }

        .social-btn {
            width: 45px;
            height: 45px;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            color: white;
            font-size: 1.2rem;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .social-btn:hover {
            transform: translateY(-3px);
        }

        .facebook { background: #3b5998; }
        .google { background: #dd4b39; }
        .twitter { background: #1da1f2; }

        .register-text {
            text-align: center;
            margin-top: 25px;
            color: #555;
            font-size: 0.95rem;
        }

        .register-text a {
            color: #4361ee;
            text-decoration: none;
            font-weight: 600;
            transition: all 0.3s ease;
        }

        .register-text a:hover {
            text-decoration: underline;
        }

        @media (max-width: 768px) {
            .container {
                flex-direction: column;
            }
            
            .illustration {
                padding: 30px;
            }
            
            .form-section {
                padding: 30px;
            }
        }