main.container {
    margin-top: 5%;
    padding: 0 20px;
}

.content {
    max-width: 500px;
    margin: 180px auto 0 auto;
    padding: 40px;
    background: var(--surface);
    border-radius: var(--radius);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
}

.signup-title {
    font-family: 'Satoshi', sans-serif;
    color: var(--brand);
    text-align: center;
    margin-bottom: 30px;
    font-weight: 300;
    font-size: clamp(24px, 5vw, 32px);
    /* Responsive font size */
}

.content h2 {
    font-family: 'Satoshi', sans-serif;
    color: var(--brand);
    text-align: center;
    font-weight: 600;
    font-size: clamp(24px, 5vw, 32px);
    /* Responsive font size */
}

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

.form-group label {
    font-family: 'Satoshi', sans-serif;
    font-weight: 500;
    color: var(--text);
    margin-bottom: 8px;
    display: block;
    font-size: clamp(14px, 2vw, 16px);
    /* Responsive label */
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-family: 'General Sans', sans-serif;
    font-size: 15px;
    transition: border-color 0.2s;
    box-sizing: border-box;
    /* Prevent overflow */
}

.form-control:focus {
    outline: none;
    border-color: var(--brand);
    box-shadow: 0 0 0 3px rgba(143, 0, 26, 0.1);
}

.form-control.is-invalid {
    border-color: #dc3545;
}

.invalid-feedback {
    color: #dc3545;
    font-size: 14px;
    margin-top: 5px;
}

.btn-primary {
    background-color: var(--brand);
    border: none;
    color: white;
    padding: 14px 32px;
    border-radius: 8px;
    font-family: 'Satoshi', sans-serif;
    font-weight: 500;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.2s;
    width: 100%;
    margin-top: 10px;
}

.btn-primary:hover {
    background-color: var(--brand-dark);
}

.btn-primary:active {
    transform: scale(0.98);
    /* Subtle press effect */
}

.text-center {
    text-align: center;
}

.text-muted {
    color: var(--text-muted);
    font-size: 14px;
}

.text-muted a {
    color: var(--brand);
    text-decoration: underline;
    transition: color 0.2s;
}

.text-muted a:hover {
    color: var(--brand);
}

.mt-3 {
    margin-top: 1rem;
}

/* Responsive breakpoints */
@media (max-width: 768px) {
    main.container {
        margin-top: 10%;
    }

    .content {
        margin: 100px auto 0 auto;
        padding: 32px 24px;
        /* Reduce padding */
        max-width: 100%;
        /* Allow full width with container padding */
    }
}

@media (max-width: 576px) {
    main.container {
        margin-top: 10%;
        padding: 0 16px;
        /* Tighter horizontal padding */
    }

    .content {
        margin: 60px auto 0 auto;
        /* Reduce top spacing */
        padding: 28px 20px;
        /* Compact padding */
        border-radius: 12px;
        /* Slightly smaller radius */
    }

    .signup-title,
    .content h2 {
        margin-bottom: 24px;
        /* Less spacing */
    }

    .form-group {
        margin-bottom: 16px;
    }

    .form-control {
        padding: 10px 14px;
        /* Slightly smaller input */
        font-size: 16px;
        /* Prevent iOS zoom on focus */
    }

    .btn-primary {
        padding: 12px 24px;
        /* Compact button */
        font-size: 15px;
    }

    .text-muted {
        font-size: 13px;
    }
}

@media (max-width: 375px) {
    main.container{
        margin-top: 25%;
    }
    .content {
        padding: 24px 16px;
        margin: 40px auto 0 auto;
    }
}