/* Ionosonde archive */
.ionosonde-page {
    background: var(--surface, #ffffff);
}

.ionosonde-lead {
    max-width: 760px;
    margin: 10px 0 0;
}

.ionosonde-contact-link {
    color: var(--teal-dark, #174f59);
    font-weight: 700;
    text-decoration: underline;
    text-decoration-thickness: 1.5px;
    text-underline-offset: 3px;
}

.ionosonde-contact-link:hover,
.ionosonde-contact-link:focus-visible {
    color: var(--ink, #202523);
}

.ionosonde-date-form {
    display: flex;
    align-items: end;
    gap: 12px;
    margin: 28px 0 18px;
}

.ionosonde-date-form label {
    display: grid;
    gap: 6px;
    color: var(--muted, #6d7478);
    font-size: .9rem;
}

.ionosonde-date-form select {
    min-width: 220px;
    min-height: 42px;
    border: 1px solid var(--line, #d9dddc);
    border-radius: 6px;
    padding: 0 12px;
    background: #fff;
    color: inherit;
    font: inherit;
}

.ionosonde-viewer {
    max-width: 940px;
    border: 1px solid var(--line, #d9dddc);
    border-radius: 8px;
    background: #fff;
    padding: clamp(18px, 3vw, 30px);
}

.ionosonde-viewer__head {
    display: flex;
    justify-content: space-between;
    align-items: start;
    gap: 18px;
    margin-bottom: 20px;
}

.ionosonde-viewer__head h3 {
    margin: 8px 0 4px;
    font-size: clamp(1.2rem, 2vw, 1.55rem);
}

.ionosonde-viewer__head p {
    margin: 0;
    color: var(--muted, #6d7478);
    font-size: .92rem;
}

.ionosonde-observation-line h3 {
    margin: 8px 0 0;
}

.ionosonde-observation-time {
    margin: 4px 0 0;
    color: var(--muted, #6d7478);
    font-size: .9rem;
    font-weight: 400;
    line-height: 1.4;
}

.ionosonde-image-stage {
    display: grid;
    grid-template-columns: 42px minmax(0, 700px) 42px;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    max-width: 100%;
    margin: 0 auto;
}

.ionosonde-image-frame {
    grid-column: 2;
    grid-row: 1;
    width: 100%;
    min-width: 0;
    max-width: 100%;
    margin: 0;
}

.ionosonde-image-frame img {
    display: block;
    width: 100%;
    max-width: 100%;
    height: auto;
    margin: 0 auto;
    background: #fff;
}

.ionosonde-image-arrow {
    display: inline-grid;
    place-items: center;
    width: 42px;
    height: 42px;
    border: 1px solid var(--line, #d9dddc);
    border-radius: 50%;
    background: #fff;
    color: var(--text, #202523);
    font-size: 1.35rem;
    line-height: 1;
    text-decoration: none;
    transition: border-color .2s ease, background-color .2s ease, color .2s ease;
}

.ionosonde-image-arrow:hover,
.ionosonde-image-arrow:focus-visible {
    border-color: var(--accent, #c77832);
    background: var(--accent, #c77832);
    color: #fff;
}

.ionosonde-image-arrow--previous {
    grid-column: 1;
    grid-row: 1;
}

.ionosonde-image-arrow--next {
    grid-column: 3;
    grid-row: 1;
}

.ionosonde-empty {
    max-width: 680px;
    padding: 24px;
    border-left: 4px solid var(--accent, #c77832);
    background: #f7f8f7;
}

.ionosonde-empty strong {
    display: block;
    margin-bottom: 6px;
}

.ionosonde-empty p {
    margin: 0;
    color: var(--muted, #6d7478);
}

@media (max-width: 640px) {
    .ionosonde-date-form {
        align-items: stretch;
        flex-direction: column;
    }

    .ionosonde-date-form select {
        width: 100%;
    }

    .ionosonde-viewer__head {
        flex-direction: column;
    }

    .ionosonde-image-stage {
        grid-template-columns: 34px minmax(0, auto) 34px;
        gap: 6px;
    }

    .ionosonde-image-arrow {
        width: 34px;
        height: 34px;
        font-size: 1.1rem;
    }


}