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

html,
body {
    height: 100%;
    min-height: 100vh;
    width: 100%;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    background: url('https://your-image-url.com/gym-background.jpg') no-repeat center center fixed;
    background-size: cover;
    padding: 20px;
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 450px;
    background: rgba(255, 255, 255, 0.85);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    margin: auto;
}

.container h2 {
    text-align: center;
    margin-bottom: 20px;
    color: #2575fc;
    font-size: 26px;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    color: #333;
    font-size: 14px;
    font-weight: bold;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 10px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 14px;
    color: #333;
    outline: none;
    transition: all 0.3s ease;
}

.btn {
    width: 100%;
    padding: 12px;
    background: #2575fc;
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: bold;
    letter-spacing: 1px;
    transition: background-color 0.3s ease;
    position: relative;
    margin-top: 10px;
}

.btn:hover {
    background: #6a11cb;
}

.link {
    text-align: center;
    margin-top: 15px;
}

.link a {
    color: #2575fc;
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s ease-in-out;
}

.link a:hover {
    color: #6a11cb;
}

/* Animation for inputs */
@keyframes inputFocus {
    0% {
        border-color: #ddd;
    }

    100% {
        border-color: #2575fc;
    }
}

.form-group input:focus {
    animation: inputFocus 0.3s forwards;
}

.message-box {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    padding: 15px;
    border-radius: 5px;
    color: #fff;
    font-size: 16px;
    animation: fadeOut 5s forwards;
}

.message-box.success {
    background-color: #4caf50;
}

.message-box.error {
    background-color: #f44336;
}

@keyframes fadeOut {

    0%,
    80% {
        opacity: 1;
    }

    100% {
        opacity: 0;
        display: none;
    }
}

.loader {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid transparent;
    border-top: 2px solid #fff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-right: 10px;
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    visibility: hidden;
}

.btn.loading .loader {
    visibility: visible;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}