* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

body {
    background: linear-gradient(120deg, #2980b9, #8e44ad);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.login-box {
    position: relative;
    width: 350px;
    padding: 40px;
    background: rgba(0, 0, 0, 0.8);
    border-radius: 10px;
    box-shadow: 0 15px 25px rgba(0, 0, 0, 0.5);
    color: white;
}

.login-box h2 {
    margin-bottom: 30px;
    text-align: center;
}

.user-box {
    position: relative;
}

.user-box input {
    width: 100%;
    padding: 10px 0;
    font-size: 16px;
    color: white;
    margin-bottom: 30px;
    border: none;
    border-bottom: 1px solid #fff;
    background: transparent;
    outline: none;
}

.user-box label {
    position: absolute;
    top: 0;
    left: 0;
    padding: 10px 0;
    font-size: 16px;
    color: #aaa;
    pointer-events: none;
    transition: 0.5s;
}

.user-box input:valid~label {
    top: -20px;
    left: 0;
    color: #03e9f4;
    font-size: 12px;
}

a {
    position: relative;
    display: inline-block;
    padding: 10px 20px;
    color: #03e9f4;
    font-size: 16px;
    text-decoration: none;
    overflow: hidden;
    transition: 0.5s;
    margin-top: 20px;
    border: 1px solid #03e9f4;
}

a:hover {
    background: #03e9f4;
    color: #fff;
    box-shadow: 0 0 5px #03e9f4,
        0 0 25px #03e9f4,
        0 0 50px #03e9f4,
        0 0 100px #03e9f4;
}

a span {
    position: absolute;
    display: block;
}

a span:nth-child(1) {
    top: 0;
    left: -100%;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, #03e9f4);
    animation: btn-anim1 1s linear infinite;
}

a span:nth-child(2) {
    top: -100%;
    right: 0;
    width: 2px;
    height: 100%;
    background: linear-gradient(180deg, transparent, #03e9f4);
    animation: btn-anim2 1s linear infinite;
    animation-delay: 0.25s;
}

a span:nth-child(3) {
    bottom: 0;
    right: -100%;
    width: 100%;
    height: 2px;
    background: linear-gradient(270deg, transparent, #03e9f4);
    animation: btn-anim3 1s linear infinite;
    animation-delay: 0.5s;
}

a span:nth-child(4) {
    bottom: -100%;
    left: 0;
    width: 2px;
    height: 100%;
    background: linear-gradient(360deg, transparent, #03e9f4);
    animation: btn-anim4 1s linear infinite;
    animation-delay: 0.75s;
}

@keyframes btn-anim1 {
    0% {
        left: -100%;
    }

    50%,
    100% {
        left: 100%;
    }
}

@keyframes btn-anim2 {
    0% {
        top: -100%;
    }

    50%,
    100% {
        top: 100%;
    }
}

@keyframes btn-anim3 {
    0% {
        right: -100%;
    }

    50%,
    100% {
        right: 100%;
    }
}

@keyframes btn-anim4 {
    0% {
        bottom: -100%;
    }

    50%,
    100% {
        bottom: 100%;
    }
}

.signup-link {
    margin-top: 10px;
    margin-bottom: 20px;
    text-align: center;
    font-size: 14px;
    color: #ccc;
}

.signup-link a {
    color: #03e9f4;
    text-decoration: none;
}

.signup-link a:hover {
    text-decoration: underline;
}

.form-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.submit-btn {
    position: relative;
    display: inline-block;
    padding: 10px 20px;
    color: #03e9f4;
    font-size: 16px;
    text-decoration: none;
    overflow: hidden;
    transition: 0.5s;
    border: 1px solid #03e9f4;
}


.submit-btn:hover {
    background: #03e9f4;
    color: #fff;
    box-shadow: 0 0 5px #03e9f4,
        0 0 25px #03e9f4,
        0 0 50px #03e9f4,
        0 0 100px #03e9f4;
}

.signup-link-inline {
    color: #03e9f4;
    font-size: 14px;
    text-decoration: none;
}

.signup-link-inline:hover {
    text-decoration: underline;
}

.error-message {
    color: #ff4d4d;
    font-size: 12px;
    margin-top: -20px;
    margin-bottom: 20px;
    display: none;
}