.mosaic-shell {
    display: grid;
    grid-template-columns: minmax(320px, 400px) minmax(360px, 1fr);
    gap: 22px;
    width: 100%;
    max-width: 1240px;
    min-height: calc(100vh - 84px);
    margin: 0 auto;
    padding: 26px 22px 40px;
}

.mosaic-settings {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.mosaic-panel {
    padding: 20px;
}

.mosaic-panel h2 {
    margin-bottom: 18px;
}

#mosaic-form {
    display: grid;
    gap: 16px;
}

#mosaic-payload {
    min-height: 56px;
}

/* Подпись с числовым значением справа */
.mosaic-panel .control-label {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 8px;
}

.mosaic-panel .control-label output {
    color: var(--accent);
    font-size: 13px;
    font-weight: 700;
    text-transform: none;
    letter-spacing: 0;
    font-variant-numeric: tabular-nums;
}

/* Слайдеры */
.slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    margin: 6px 0;
    border-radius: 6px;
    background: var(--border-strong);
    cursor: pointer;
}

.slider:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border: 3px solid #fff;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 2px 6px rgba(124, 58, 237, .4);
}

.slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border: 3px solid #fff;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 2px 6px rgba(124, 58, 237, .4);
}

/* Превью */
.mosaic-preview-region {
    display: flex;
    min-width: 0;
    flex-direction: column;
    padding: 20px;
}

.mosaic-canvas {
    position: relative;
    display: grid;
    flex: 1;
    place-items: center;
    min-height: 440px;
    padding: clamp(18px, 2.6vw, 36px);
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: 16px;
    background-color: var(--canvas);
    background-image:
        linear-gradient(var(--grid) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid) 1px, transparent 1px);
    background-size: 26px 26px;
    box-shadow: inset 0 1px 3px rgba(17, 38, 82, .05);
}

.mosaic-canvas img {
    position: relative;
    z-index: 1;
    display: block;
    width: min(100%, 560px);
    height: auto;
    border-radius: 16px;
    box-shadow: 0 16px 40px rgba(17, 38, 82, .14);
    animation: pop-in 220ms cubic-bezier(.34, 1.4, .5, 1);
}

.mosaic-canvas img[hidden] {
    display: none;
}

.mosaic-canvas.is-loading img {
    opacity: .35;
}

.mosaic-placeholder {
    color: #c4d2ea;
}

.mosaic-placeholder svg {
    width: clamp(120px, 24vw, 180px);
    height: auto;
}

.mosaic-canvas:not(.is-empty) .mosaic-placeholder {
    display: none;
}

#mosaic-loader {
    position: absolute;
    z-index: 2;
    width: 40px;
    height: 40px;
    border: 3px solid rgba(124, 58, 237, .18);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin .8s linear infinite;
}

#mosaic-loader[hidden] {
    display: none;
}

.mosaic-readability {
    display: flex;
    align-items: center;
    gap: 9px;
    margin-top: 12px;
    padding: 11px 14px;
    border-radius: 12px;
    font-size: 13px;
    font-weight: 650;
}

.mosaic-readability[hidden] {
    display: none;
}

.mosaic-readability::before {
    content: "";
    width: 10px;
    height: 10px;
    flex: 0 0 auto;
    border-radius: 50%;
    background: currentColor;
}

.mosaic-readability.is-ok {
    border: 1px solid rgba(22, 163, 74, .28);
    background: rgba(22, 163, 74, .1);
    color: var(--success);
}

.mosaic-readability.is-warn {
    border: 1px solid var(--warning-border);
    background: var(--warning-bg);
    color: #72510b;
}

.mosaic-messages {
    margin-top: 8px;
    font-size: 12.5px;
    color: var(--muted);
}

.mosaic-messages.is-error {
    padding: 11px 14px;
    border: 1px solid var(--danger-border);
    border-radius: 12px;
    background: var(--danger-bg);
    color: var(--danger);
    font-weight: 600;
}

.mosaic-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 16px;
}

.mosaic-actions .download-button {
    flex: 1 1 220px;
    margin-top: 0;
}

.mosaic-download {
    display: inline-flex;
    flex: 0 0 auto;
    align-items: center;
    justify-content: center;
    gap: 9px;
    min-height: 58px;
    padding: 0 22px;
    border: 1.5px solid var(--border-strong);
    border-radius: var(--radius-control);
    background: #fff;
    color: var(--text);
    font-size: 15px;
    font-weight: 700;
    text-decoration: none;
    transition: border-color var(--transition), color var(--transition), transform var(--transition);
}

.mosaic-download[hidden] {
    display: none;
}

.mosaic-download:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-1px);
}

.mosaic-download svg {
    width: 20px;
    height: 20px;
}

@media (max-width: 899px) {
    .mosaic-shell {
        display: flex;
        flex-direction: column;
        gap: 16px;
        min-height: 0;
        padding: 20px 16px 30px;
    }

    .mosaic-canvas {
        min-height: 320px;
    }

    .mosaic-actions .download-button,
    .mosaic-download {
        flex: 1 1 auto;
    }
}