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

        body {
            font-family: 'Arial', sans-serif;
            background: linear-gradient(135deg, #1a0033 0%, #0d001a 100%);
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            overflow: hidden;
            position: relative;
        }

        #particles {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: 1;
        }

        .particle {
            position: absolute;
            width: 4px;
            height: 4px;
            border-radius: 50%;
            pointer-events: none;
        }

        .container {
            position: relative;
            z-index: 2;
            background: rgba(30, 0, 50, 0.6);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: 20px;
            padding: 50px 40px;
            width: 90%;
            max-width: 400px;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
        }

        h1 {
            text-align: center;
            font-size: 2rem;
            margin-bottom: 40px;
            background: linear-gradient(90deg, #00d9ff 0%, #ff00ff 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            text-transform: uppercase;
            letter-spacing: 3px;
            font-weight: bold;
        }

        .input-group {
            margin-bottom: 25px;
        }

        input {
            width: 100%;
            padding: 15px 20px;
            background: rgba(50, 50, 70, 0.5);
            border: 2px solid rgba(100, 100, 120, 0.3);
            border-radius: 10px;
            color: #fff;
            font-size: 16px;
            transition: all 0.3s ease;
            outline: none;
        }

        input:focus {
            border-color: #00d9ff;
            box-shadow: 0 0 20px rgba(0, 217, 255, 0.3);
        }

        input::placeholder {
            color: rgba(255, 255, 255, 0.5);
        }

        .btn {
            width: 100%;
            padding: 15px;
            margin-top: 10px;
            background: linear-gradient(90deg, #00d9ff 0%, #ff00ff 100%);
            border: none;
            border-radius: 10px;
            color: #fff;
            font-size: 18px;
            font-weight: bold;
            text-transform: uppercase;
            letter-spacing: 2px;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 5px 25px rgba(0, 217, 255, 0.4);
        }

        .btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 35px rgba(0, 217, 255, 0.6);
        }

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

        .register-link {
            text-align: center;
            margin-top: 25px;
            color: rgba(255, 255, 255, 0.7);
            font-size: 14px;
        }

        .register-link a {
            color: #00d9ff;
            text-decoration: none;
            font-weight: bold;
            transition: all 0.3s ease;
        }

        .register-link a:hover {
            color: #ff00ff;
            text-shadow: 0 0 10px rgba(0, 217, 255, 0.5);
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .container {
                padding: 40px 30px;
                width: 95%;
            }

            h1 {
                font-size: 1.6rem;
                letter-spacing: 2px;
                margin-bottom: 30px;
            }

            input {
                padding: 12px 16px;
                font-size: 15px;
            }

            .btn {
                padding: 13px;
                font-size: 16px;
                letter-spacing: 1.5px;
            }

            .register-link {
                font-size: 13px;
            }
        }

        @media (max-width: 480px) {
            .container {
                padding: 30px 20px;
            }

            h1 {
                font-size: 1.4rem;
                letter-spacing: 1.5px;
                margin-bottom: 25px;
            }

            input {
                padding: 10px 14px;
                font-size: 14px;
            }

            .btn {
                padding: 12px;
                font-size: 15px;
                letter-spacing: 1px;
            }

            .register-link {
                font-size: 12px;
                margin-top: 20px;
            }
        }

        @media (max-width: 360px) {
            .container {
                padding: 25px 15px;
            }

            h1 {
                font-size: 1.2rem;
            }

            input {
                padding: 10px 12px;
                font-size: 13px;
            }

            .btn {
                font-size: 14px;
            }
        }