/* Review gallery. Phone first; previous and this build sit side by side from
   768px (iPad portrait and phones held sideways), stacked below that. */

:root {
    --bg: #ffffff;
    --fg: #1d2330;
    --muted: #5f6b7a;
    --line: #dde2e8;
    --panel: #f5f7fa;
    --accent: #2457d6;
    --drift: #b42318;
    --drift-bg: #fde8e7;
    --edit: #8a5a00;
    --edit-bg: #fdf1d8;
    --new: #1f6f43;
    --new-bg: #dff3e7;
    --neutral-bg: #eceff3;
    --add-bg: #e3f6e9;
    --del-bg: #fde8e7;
    --pad: max(16px, env(safe-area-inset-left));
    --pad-r: max(16px, env(safe-area-inset-right));
    color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #12151b;
        --fg: #e6e9ee;
        --muted: #98a2b3;
        --line: #2a313c;
        --panel: #1a1f27;
        --accent: #7aa2ff;
        --drift: #ff8a80;
        --drift-bg: #3d1d1b;
        --edit: #f5c46b;
        --edit-bg: #3a2d12;
        --new: #7fd6a3;
        --new-bg: #163324;
        --neutral-bg: #232a34;
        --add-bg: #15301f;
        --del-bg: #3d1d1b;
    }
}

* {
    box-sizing: border-box;
}

[hidden] {
    display: none !important;
}

html,
body {
    margin: 0;
    background: var(--bg);
    color: var(--fg);
    font:
        15px/1.45 system-ui,
        -apple-system,
        'Segoe UI',
        sans-serif;
}

body {
    padding: 0 var(--pad-r) calc(120px + env(safe-area-inset-bottom)) var(--pad);
    overflow-x: hidden;
}

body.root-page,
body.build-page,
body.compare-page {
    padding-bottom: calc(72px + env(safe-area-inset-bottom));
}

a {
    color: var(--accent);
}

h1 {
    font-size: 1.35rem;
    margin: 0.4rem 0;
    overflow-wrap: anywhere;
}

h2 {
    font-size: 1.05rem;
    margin: 1.2rem 0 0.5rem;
}

.top {
    padding-top: max(12px, env(safe-area-inset-top));
}

.crumbs,
.muted,
.byline,
.meta.small {
    color: var(--muted);
    font-size: 0.85rem;
}

.meta {
    margin: 0.2rem 0;
    overflow-wrap: anywhere;
}

.meta .byline {
    display: block;
}

.sha {
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

.roadmap-title {
    margin: 0;
    font-weight: 600;
}

.description {
    margin: 0.3rem 0;
    max-width: 70ch;
}

.note {
    color: var(--muted);
}

.chip {
    display: inline-block;
    padding: 0.05rem 0.5rem;
    border-radius: 999px;
    background: var(--neutral-bg);
    font-size: 0.78rem;
    font-weight: 500;
    vertical-align: middle;
    white-space: nowrap;
}

.status-drift,
.status-removed {
    background: var(--drift-bg);
    color: var(--drift);
}

.status-edit {
    background: var(--edit-bg);
    color: var(--edit);
}

.status-new {
    background: var(--new-bg);
    color: var(--new);
}

.summary .chip {
    margin: 0 0.25rem 0.25rem 0;
}

.button,
button,
select {
    font: inherit;
    border: 1px solid var(--line);
    background: var(--panel);
    color: var(--fg);
    border-radius: 8px;
    padding: 0.35rem 0.75rem;
    text-decoration: none;
    display: inline-block;
}

.button {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--bg);
    font-weight: 600;
}

/* --- Compare widget -------------------------------------------------------- */

.compare {
    margin: 0.75rem 0;
}

.compare img.fallback {
    max-width: 100%;
    height: auto;
}

.compare-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-bottom: 0.5rem;
}

.seg {
    display: inline-flex;
    border: 1px solid var(--line);
    border-radius: 8px;
    overflow: hidden;
}

.seg button {
    border: 0;
    border-radius: 0;
    padding: 0.3rem 0.6rem;
    font-size: 0.82rem;
    background: var(--panel);
}

.seg button + button {
    border-left: 1px solid var(--line);
}

.seg button.on {
    background: var(--accent);
    color: var(--bg);
}

.source-toggle {
    font-size: 0.82rem;
    padding: 0.3rem 0.6rem;
}

.source-toggle.on {
    background: var(--accent);
    color: var(--bg);
}

.panes {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 0.75rem;
}

@media (min-width: 768px) {
    html[data-layout='auto'] .panes {
        grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    }
}

html[data-layout='side'] .panes {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
}

.panes:has(> .pane:only-child) {
    grid-template-columns: minmax(0, 1fr);
}

.pane {
    margin: 0;
    border: 1px solid var(--line);
    border-radius: 10px;
    overflow: hidden;
    background: var(--panel);
}

.pane figcaption,
.stage-caption {
    padding: 0.35rem 0.6rem;
    font-size: 0.8rem;
    border-bottom: 1px solid var(--line);
    overflow-wrap: anywhere;
}

.pane-prev figcaption strong {
    color: var(--muted);
}

.scroll {
    background: #fff;
}

.scroll img {
    display: block;
    max-width: 100%;
    height: auto;
}

html[data-size='actual'] .scroll {
    overflow: auto;
    max-height: 75vh;
}

html[data-size='actual'] .scroll img {
    max-width: none;
}

.stage {
    border: 1px solid var(--line);
    border-radius: 10px;
    overflow: hidden;
    background: var(--panel);
}

.stage-scroll {
    background: #fff;
    overflow: hidden;
    position: relative;
}

html[data-size='actual'] .stage-scroll {
    overflow: auto;
    max-height: 75vh;
}

.layer {
    position: relative;
    transform-origin: 0 0;
}

.layer > * {
    position: absolute;
    top: 0;
    left: 0;
}

.layer img {
    max-width: none;
}

.stage[data-mode='blink'] .layer-prev,
.stage[data-mode='diff'] .layer-prev,
.stage[data-mode='diff'] .layer-this {
    visibility: hidden;
}

.stage[data-mode='blink'].show-prev .layer-prev {
    visibility: visible;
}

.stage[data-mode='blink'].show-prev .layer-this {
    visibility: hidden;
}

.layer-diff {
    display: none;
}

.stage[data-mode='diff'] .layer-diff {
    display: block;
}

.wipe {
    width: 100%;
    margin: 0.5rem 0;
}

/* --- Source --------------------------------------------------------------- */

.source-row {
    margin-top: 0.75rem;
}

.compare[data-source='closed'] > .source-row,
body.collapsed .source-row {
    display: none;
}

.source-file > summary {
    cursor: pointer;
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 0.85rem;
    padding: 0.3rem 0;
}

pre {
    margin: 0.25rem 0 0.75rem;
    padding: 0.6rem 0.75rem;
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 8px;
    overflow-x: auto;
    font:
        0.8rem/1.45 ui-monospace,
        SFMono-Regular,
        Menlo,
        monospace;
    tab-size: 2;
}

.diff .line {
    display: block;
    white-space: pre;
}

.source-pair {
    display: none;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 0.5rem;
    margin: 0.25rem 0 0.75rem;
}

.source-col {
    min-width: 0;
    overflow-x: auto;
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 0.4rem 0;
    font:
        0.8rem/1.45 ui-monospace,
        SFMono-Regular,
        Menlo,
        monospace;
    tab-size: 2;
}

.source-col .cell {
    display: block;
    width: max-content;
    min-width: 100%;
    min-height: 1.45em;
    padding: 0 0.6rem;
    white-space: pre;
}

.source-col .cell.del {
    background: var(--del-bg);
}

.source-col .cell.add {
    background: var(--add-bg);
}

.source-unified {
    display: block;
}

/* Same rules as .panes: pair from 768px with layout auto, or whenever the
   layout is Side; the unified list otherwise. */
@media (min-width: 768px) {
    html[data-layout='auto'] .source-pair {
        display: grid;
    }
    html[data-layout='auto'] .source-unified {
        display: none;
    }
}

html[data-layout='side'] .source-pair {
    display: grid;
}

html[data-layout='side'] .source-unified {
    display: none;
}

.diff .op-add {
    background: var(--add-bg);
}

.diff .op-del {
    background: var(--del-bg);
}

.file-name {
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 0.8rem;
    color: var(--muted);
}

/* --- Navigation ------------------------------------------------------------ */

.navbar {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    background: color-mix(in srgb, var(--bg) 92%, transparent);
    backdrop-filter: blur(8px);
    border-top: 1px solid var(--line);
    padding: 0.35rem var(--pad-r) calc(0.35rem + env(safe-area-inset-bottom)) var(--pad);
    z-index: 10;
}

.nav-row {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    min-height: 2.2rem;
    white-space: nowrap;
}

.nav-row + .nav-row {
    border-top: 1px solid var(--line);
}

.nav-row a,
.nav-row .disabled {
    padding: 0.3rem 0.2rem;
    text-decoration: none;
    font-weight: 500;
}

.disabled {
    color: var(--muted);
    opacity: 0.5;
}

.item-row .counter {
    flex: 1;
    text-align: center;
    color: var(--muted);
    font-size: 0.85rem;
}

.item-row .prev-item,
.item-row .next-item {
    font-size: 1.05rem;
}

.changed-only {
    font-size: 0.82rem;
}

.history-row {
    font-size: 0.82rem;
}

.history-strip {
    flex: 1;
    display: flex;
    gap: 3px;
    overflow-x: auto;
    align-items: center;
    min-width: 0;
    padding: 0.3rem 0;
}

.history-strip .dot {
    flex: none;
    width: 9px;
    height: 9px;
    padding: 0;
    border-radius: 50%;
    border: 1.5px solid var(--muted);
}

.history-strip .dot.changed {
    background: var(--drift);
    border-color: var(--drift);
}

.history-strip .dot.current {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.navbar.static .nav-row {
    justify-content: space-between;
}

/* Narrow phones: drop the long labels so both rows fit. */
@media (max-width: 420px) {
    .index-link {
        display: none;
    }
}

/* Phones held sideways: little height, so one compact bar and no strip. */
@media (max-height: 500px) {
    body.entry-page {
        padding-bottom: calc(56px + env(safe-area-inset-bottom));
    }
    .entry-page .top .description,
    .entry-page .top .params,
    .entry-page .top .roadmap-title,
    .entry-page .top .meta {
        display: none;
    }
    .entry-page h1 {
        font-size: 1.05rem;
        margin: 0.2rem 0;
    }
    .navbar {
        display: flex;
        gap: 0.75rem;
        align-items: center;
    }
    .nav-row + .nav-row {
        border-top: 0;
    }
    .history-row {
        order: 2;
    }
    .history-strip {
        display: none;
    }
    .item-row {
        flex: 1;
    }
    html[data-size='actual'] .scroll,
    html[data-size='actual'] .stage-scroll {
        max-height: 62vh;
    }
    .source-row {
        max-height: 50vh;
        overflow: auto;
    }
}

/* --- Grids, lists, cards --------------------------------------------------- */

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 0.75rem;
}

.tile {
    display: flex;
    flex-direction: column;
    border: 1px solid var(--line);
    border-radius: 10px;
    overflow: hidden;
    text-decoration: none;
    color: var(--fg);
    background: var(--panel);
}

.tile .thumbs {
    display: flex;
    background: #fff;
    height: 110px;
    align-items: flex-start;
    overflow: hidden;
}

.tile .thumbs img {
    flex: 1;
    min-width: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
    object-position: top left;
}

.tile.pair .thumbs img + img {
    border-left: 2px solid var(--line);
}

.tile-label {
    padding: 0.35rem 0.5rem;
    font-size: 0.82rem;
    overflow-wrap: anywhere;
}

.card {
    border-top: 1px solid var(--line);
    padding-top: 0.25rem;
}

.card h2 {
    margin: 0.6rem 0 0.3rem;
}

body.collapsed .compare-toolbar,
body.collapsed .pane figcaption,
body.collapsed .stage {
    display: none;
}

body.collapsed .panes {
    display: grid !important;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
}

body.collapsed .scroll {
    max-height: 140px;
    overflow: hidden;
}

.builds {
    list-style: none;
    padding: 0;
    margin: 0;
}

.build-row {
    display: grid;
    gap: 0.1rem;
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--line);
}

.build-link {
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-weight: 600;
}

.range {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: end;
}

.range label {
    display: grid;
    font-size: 0.8rem;
    color: var(--muted);
    min-width: 0;
}

.range select {
    max-width: 80vw;
}

.toolbar {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.pr-number {
    font-weight: 600;
}

.line-name {
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}