body {
    background: #f6f8fa;
    font-family: 'Segoe UI', Arial, sans-serif;
    color: #333;
}

.title {
    text-align: center;
    font-size: 2.6rem;
    font-weight: 700;
    margin: 2rem 0 1rem 0;
    color: #293752;
    letter-spacing: 1px;
}

form[role="form"] {
    max-width: 440px;
    margin: 2rem auto;
    background: #fff;
    padding: 2.2rem 2rem 2rem 2rem;
    border-radius: 16px;
    box-shadow: 0 2px 24px rgba(40,60,80,0.12);
}

.form-group {
    margin-bottom: 1.4rem;
}

label {
    font-weight: 500;
    margin-bottom: 0.45rem;
    display: block;
    color: #1a202c;
}

input.form-control {
    background: #f9fafb;
    border: 1px solid #dbe0ea;
    border-radius: 6px;
    padding: 0.7rem 1rem;
    font-size: 1.07rem;
    transition: border-color 0.2s;
    margin-bottom: 0.2rem;
}

input.form-control:focus {
    border-color: #4669fa;
    box-shadow: 0 1px 4px rgba(70,105,250,0.11);
    outline: none;
}

.custom-link-text {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    margin: 0.7rem 0 0.9rem 0;
}

.site-url-field {
    font-size: 1.13rem;
    margin: 0;
    font-weight: 500;
    color: #4051b5;
}

.custom-url-field {
    flex: 1 1 60%;
    font-size: 1.05rem;
}

.btn,
button,
input[type="submit"] {
    border: none;
    border-radius: 5px;
    background: #4669fa;
    color: #fff;
    padding: 0.57rem 1.3rem;
    font-weight: 500;
    font-size: 1rem;
    margin: 0.25rem 0.15rem;
    transition: background 0.17s;
    cursor: pointer;
    box-shadow: 0 1px 5px rgba(70,105,250,0.08);
}

.btn-warning {
    background: #ffcb3c;
    color: #293752;
}

.btn-success {
    background: #43c57b;
}

.btn-info {
    background: #536dfe;
}

.btn-xs {
    padding: 0.35rem 0.7rem;
    font-size: 0.92rem;
}

.btn:hover,
button:hover,
input[type="submit"]:hover {
    background: #2a46c0;
    color: #fff;
}

.btn-group.btn-toggle {
    display: flex;
    gap: 0.45rem;
    margin-bottom: 0.8rem;
}

.btn-group label {
    /* For Bootstrap style toggle look */
    background: #e9eefa;
    color: #4669fa;
    border: 1px solid #b8c4e5;
    cursor: pointer;
    font-size: 0.98rem;
    padding: 0.38rem 1rem;
    border-radius: 4px;
    margin-right: 0.13rem;
    transition: background 0.17s, color 0.17s;
}

.btn-group .btn.active,
.btn-group .btn:active {
    background: #4669fa;
    color: #fff;
    box-shadow: 0 0.5px 3px rgba(70,105,250,0.11);
}

#tips {
    max-width: 420px;
    margin: 2rem auto 0 auto;
    background: #e9eefa;
    border-radius: 8px;
    padding: 1rem 1.2rem;
    font-size: 0.97rem;
    color: #4051b5;
    text-align: center;
}

#link-availability-status {
    min-height: 1.1em;
    margin-top: 0.3rem;
    font-size: 0.93rem;
}

/* Responsive Design */
@media (max-width: 600px) {
    form[role="form"] {
        padding: 1.4rem 0.8rem 1.3rem;
    }
    .title {
        font-size: 1.55rem;
    }
}