.serial-validation {
    background: #f5f7fa;
    min-height: 70vh;
    /* Keep content clear of the fixed global navbar. */
    padding: calc(3rem + 80px) 6% 3rem;
}

.serial-validation__hero {
    max-width: 900px;
    margin: 0 auto 2rem;
    text-align: center;
}

.serial-validation__hero h1 {
    color: #0f2f5b;
    margin-top: 0;
    margin-bottom: 0.75rem;
    font-size: clamp(1.8rem, 3.5vw, 2.6rem);
    line-height: 1.2;
}

.serial-validation__hero p {
    color: #43526a;
    margin: 0;
}

.serial-validation__grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(260px, 1fr));
    gap: 1.5rem;
    max-width: 1150px;
    margin: 0 auto;
}

.serial-validation__card {
    background: #ffffff;
    border-radius: 14px;
    padding: 1.5rem;
    box-shadow: 0 6px 18px rgba(7, 24, 52, 0.08);
}

.serial-validation__card h2 {
    margin-top: 0;
    margin-bottom: 0.35rem;
    color: #0f2f5b;
}

.serial-validation__card p {
    color: #46566e;
}

.serial-validation__form {
    display: grid;
    gap: 0.85rem;
}

.serial-validation__form label {
    display: grid;
    gap: 0.35rem;
    color: #0e274a;
    font-weight: 600;
    font-size: 0.95rem;
}

.serial-validation__form input,
.serial-validation__form textarea,
.serial-validation__form button {
    border-radius: 8px;
    border: 1px solid #d4dbe7;
    font-size: 0.95rem;
    padding: 0.68rem 0.75rem;
}

.serial-validation__form input:focus,
.serial-validation__form textarea:focus {
    border-color: #0f2f5b;
    outline: none;
    box-shadow: 0 0 0 2px rgba(15, 47, 91, 0.14);
}

.serial-validation__form button {
    background: #0f2f5b;
    color: #ffffff;
    font-weight: 700;
    cursor: pointer;
    border: none;
}

.serial-validation__form button:hover {
    background: #143f78;
}

.serial-validation__hint {
    margin: -0.2rem 0 0.2rem;
    font-size: 0.85rem;
    color: #6d7f99;
}

.serial-validation__message {
    margin: 0.3rem 0 0;
    font-weight: 600;
}

.serial-validation__message.success {
    color: #177245;
}

.serial-validation__message.error {
    color: #ae1c1c;
}

.serial-validation__status {
    margin-top: 1rem;
    border-radius: 10px;
    border: 1px solid #dbe2ef;
    background: #f9fbff;
    min-height: 70px;
    padding: 0.9rem;
    color: #1f3049;
}

.serial-validation__status.empty {
    color: #667792;
}

.serial-validation__status strong {
    color: #0f2f5b;
}

.serial-validation__status a {
    color: #0f2f5b;
    font-weight: 700;
}

.serial-validation__contact-btn {
    display: inline-block;
    margin-top: 0.85rem;
    border-radius: 8px;
    background: #0f2f5b;
    color: #ffffff;
    font-weight: 700;
    text-decoration: none;
    padding: 0.68rem 0.95rem;
}

.serial-validation__contact-btn:hover {
    background: #143f78;
}

.serial-validation__modal {
    position: fixed;
    inset: 0;
    background: rgba(7, 20, 38, 0.55);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 999;
    padding: 1rem;
}

.serial-validation__modal[hidden] {
    display: none;
}

.serial-validation__modal-panel {
    width: min(520px, 100%);
    background: #ffffff;
    border-radius: 12px;
    padding: 1.1rem;
    box-shadow: 0 8px 30px rgba(7, 24, 52, 0.22);
}

.serial-validation__modal-panel h3 {
    margin: 0 0 0.25rem;
    color: #0f2f5b;
}

.serial-validation__modal-actions {
    display: flex;
    gap: 0.6rem;
    margin-top: 0.2rem;
}

.serial-validation__secondary-btn {
    background: #e8edf6;
    color: #0f2f5b;
}

.serial-validation__secondary-btn:hover {
    background: #dbe5f4;
}

@media (max-width: 920px) {
    .serial-validation__grid {
        grid-template-columns: 1fr;
    }

    .serial-validation {
        padding: calc(2rem + 72px) 1rem 2rem;
    }
}