.collage-page {
    max-width: min(1200px, calc(100vw - 1.5rem));
    padding-bottom: 2rem;
}

.collage-intro {
    max-width: 920px;
}

.collage-intro .section-note a {
    font-weight: 600;
}

.collage-edit-bar {
    position: sticky;
    top: var(--header-offset);
    z-index: 40;
    margin: 0 0 0.85rem;
    padding: 0.65rem 0.75rem 0.55rem;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: color-mix(in srgb, var(--bg-secondary) 94%, transparent);
    backdrop-filter: blur(6px);
}

.collage-edit-bar-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem 0.45rem;
    align-items: center;
}

.collage-edit-sep {
    width: 1px;
    height: 1.4rem;
    margin: 0 0.2rem;
    background: var(--border);
}

.collage-btn {
    appearance: none;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: "Manrope", "Segoe UI", sans-serif;
    font-weight: 700;
    font-size: 0.82rem;
    padding: 0.35rem 0.7rem;
    cursor: pointer;
    line-height: 1.3;
}

.collage-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.collage-btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.collage-btn-accent {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.collage-btn-accent:hover {
    filter: brightness(1.08);
    color: #fff;
}

.collage-btn-danger:hover {
    border-color: #c0392b;
    color: #c0392b;
}

.collage-btn.is-active {
    border-color: var(--accent);
    color: var(--accent);
    box-shadow: inset 0 0 0 1px var(--accent);
}

.collage-edit-hint {
    margin: 0.45rem 0 0;
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-family: "IBM Plex Mono", "JetBrains Mono", monospace;
}

.collage-edit-hint code {
    font-size: 0.92em;
}

.collage-viewport {
    width: 100%;
    /* View mode: flow with the page so mobile can scroll/pan normally */
    overflow: visible;
    border: 1px solid var(--border);
    border-radius: 12px;
    background:
        linear-gradient(135deg, color-mix(in srgb, var(--accent) 8%, var(--bg-primary)) 0%, var(--bg-primary) 42%, color-mix(in srgb, var(--text-secondary) 6%, var(--bg-primary)) 100%);
    padding: 0.75rem;
}

.collage-page.is-editing .collage-viewport {
    overflow: auto;
    min-height: min(70vh, 640px);
    -webkit-overflow-scrolling: touch;
}

.collage-scale-wrap {
    margin: 0 auto;
    overflow: hidden;
}

.collage-board {
    position: relative;
    background: var(--bg-secondary);
    box-shadow: 0 12px 40px color-mix(in srgb, #000 12%, transparent);
    transform-origin: top left;
}

.collage-page.is-editing .collage-board {
    touch-action: none;
    outline: 2px dashed color-mix(in srgb, var(--accent) 55%, transparent);
    outline-offset: -2px;
    background:
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 31px,
            color-mix(in srgb, var(--border) 55%, transparent) 31px,
            color-mix(in srgb, var(--border) 55%, transparent) 32px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 31px,
            color-mix(in srgb, var(--border) 55%, transparent) 31px,
            color-mix(in srgb, var(--border) 55%, transparent) 32px
        ),
        var(--bg-secondary);
}

.collage-sticker {
    position: absolute;
    left: 0;
    top: 0;
    margin: 0;
    padding: 0;
    border: none;
    background: transparent;
    transform-origin: top left;
    user-select: none;
    -webkit-user-drag: none;
    max-width: none;
    cursor: default;
}

.collage-page.is-editing .collage-sticker {
    cursor: grab;
    touch-action: none;
}

.collage-page.is-editing .collage-sticker.is-dragging {
    cursor: grabbing;
}

.collage-sticker img {
    display: block;
    width: auto;
    height: auto;
    max-width: none;
    pointer-events: none;
    user-select: none;
    -webkit-user-drag: none;
}

/* Nearest-neighbor upscale for sprites / pixel art */
.collage-sticker.is-pixel img {
    image-rendering: -moz-crisp-edges;
    image-rendering: crisp-edges;
    image-rendering: pixelated;
}

.collage-sticker.is-selected {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    z-index: 9999 !important;
}

.collage-resize-handle {
    display: none;
    appearance: none;
    position: absolute;
    right: -8px;
    bottom: -8px;
    width: 16px;
    height: 16px;
    padding: 0;
    margin: 0;
    border-radius: 3px;
    background: var(--accent);
    border: 2px solid #fff;
    box-shadow: 0 1px 4px color-mix(in srgb, #000 35%, transparent);
    cursor: nwse-resize;
    touch-action: none;
    z-index: 2;
}

.collage-page.is-editing .collage-sticker.is-selected .collage-resize-handle {
    display: block;
}

.collage-sticker.is-resizing {
    cursor: nwse-resize;
}

.collage-empty {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    padding: 2rem;
    text-align: center;
    color: var(--text-secondary);
    font-family: "Manrope", "Segoe UI", sans-serif;
    font-weight: 600;
    pointer-events: none;
}

@media (max-width: 700px) {
    .collage-edit-sep {
        display: none;
    }

    .collage-page.is-editing .collage-viewport {
        min-height: 50vh;
    }
}