/* Grain. Layout only — every colour below is one of css/style.css's shared
   custom properties, so this file is not a sixth place
   scripts/check_palette.py would have to track. */

/* Neither section on this page ever gets the `hidden` attribute — encode and
   decode are both always present — but the sample-carrier <img> and the
   result panels do, and the browser's own `[hidden]` rule is too low
   specificity to survive this file's other selectors. Same fix as
   css/iris.css and css/game.css. */
[hidden] {
    display: none !important;
}

.skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
    background: var(--bg-alt);
    color: var(--text);
    padding: 0.5rem 1rem;
    border-radius: 0 0 8px 0;
    z-index: 10;
}

.skip-link:focus {
    left: 0;
}

.grain--page {
    display: block;
    max-width: var(--measure);
    margin: 0 auto;
    padding: 0 1.5rem 3rem;
}

.grain--head {
    max-width: var(--measure);
    margin: 0 auto;
    padding: 2rem 1.5rem 1rem;
}

.grain--sub {
    max-width: var(--measure);
    color: var(--text-muted);
}

.grain--sub a {
    color: var(--accent-text);
    text-decoration: underline;
}

.grain--honest {
    font-size: 0.9rem;
}

.grain--notice {
    color: var(--text-muted);
    min-height: 1.25em;
}

.grain--section {
    margin: 2rem 0;
    padding: 1.25rem 1.5rem;
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: 8px;
}

.grain--section h2 {
    margin-top: 0;
}

.grain--field {
    margin: 0 0 1.5rem;
}

.grain--field-heading {
    margin: 0 0 0.35rem;
}

.grain--field-hint {
    margin: 0 0 0.75rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.grain--drop {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    background: var(--bg);
    border: 1px dashed var(--border);
    border-radius: 6px;
}

.grain--drop.grain--drop-over {
    border-color: var(--accent-text);
}

.grain--file-label {
    font: inherit;
    font-weight: 600;
    cursor: pointer;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    color: var(--bg);
    background: var(--accent-text);
    border: 2px solid var(--accent-text);
}

.grain--file-label:hover {
    color: var(--accent-text);
    background: var(--bg);
}

.grain--file-input {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
}

.grain--file-input:focus-visible + .grain--file-label,
.grain--file-label:has(+ .grain--file-input:focus-visible) {
    outline: 3px solid var(--accent-text);
    outline-offset: 2px;
}

.grain--or {
    margin: 0.75rem 0;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.grain--sample {
    font: inherit;
    cursor: pointer;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    color: var(--accent-text);
    background: var(--bg);
    border: 2px solid var(--accent-text);
}

.grain--sample:hover {
    color: var(--bg);
    background: var(--accent-text);
}

.grain--sample:focus-visible {
    outline: 3px solid var(--accent-text);
    outline-offset: 2px;
}

.grain--carrier-preview,
.grain--stego-preview {
    display: block;
    margin: 1rem 0;
    max-width: 100%;
    max-height: 240px;
    border: 1px solid var(--border);
    border-radius: 6px;
}

.grain--capacity {
    margin: 0.75rem 0 0;
    font-size: 0.9rem;
}

.grain--label {
    display: block;
    margin: 0 0 0.25rem;
    font-weight: 600;
}

.grain--pass-row {
    margin: 0 0 0.75rem;
}

.grain--input {
    font: inherit;
    width: 100%;
    max-width: 24rem;
    padding: 0.5rem 0.75rem;
    color: var(--text);
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 6px;
}

.grain--input:focus-visible {
    outline: 3px solid var(--accent-text);
    outline-offset: 2px;
}

.grain--pass-show-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0 0 0.75rem;
}

.grain--checkbox:focus-visible {
    outline: 3px solid var(--accent-text);
    outline-offset: 2px;
}

.grain--pass-hint {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.grain--action {
    font: inherit;
    font-weight: 600;
    cursor: pointer;
    padding: 0.6rem 1.25rem;
    border-radius: 6px;
    color: var(--bg);
    background: var(--accent-text);
    border: 2px solid var(--accent-text);
}

.grain--action:hover {
    color: var(--accent-text);
    background: var(--bg);
}

.grain--action:focus-visible {
    outline: 3px solid var(--accent-text);
    outline-offset: 2px;
}

.grain--action[aria-disabled='true'] {
    cursor: progress;
    opacity: 0.6;
}

.grain--result {
    margin-top: 1.5rem;
}

.grain--download {
    display: inline-block;
    font-weight: 600;
    color: var(--accent-text);
    text-decoration: underline;
}

.grain--download:focus-visible {
    outline: 3px solid var(--accent-text);
    outline-offset: 2px;
}

@media (max-width: 750px) {
    .grain--head {
        padding: 1.5rem 1rem 0.75rem;
    }

    .grain--page {
        padding: 0 1rem 2rem;
    }

    .grain--drop {
        flex-direction: column;
        align-items: flex-start;
    }
}