/* TSL lab — chrome aligned with Talesmith reader palette */

:root {
    --lab-bg: #e5e0d4;
    --lab-bg-subtle: linear-gradient(180deg, #ebe6dc 0%, #e0dbd0 100%);
    --lab-surface: #fffcf7;
    --lab-surface-elevated: #ffffff;
    --lab-ink: #1c1917;
    --lab-ink-muted: #57534e;
    --lab-ink-faint: #78716c;
    --lab-border: rgba(28, 25, 23, 0.1);
    --lab-border-strong: rgba(28, 25, 23, 0.16);
    --lab-accent: #3d5a73;
    --lab-accent-hover: #2f4759;
    --lab-accent-soft: #e4edf4;
    --lab-accent-ring: rgba(61, 90, 115, 0.35);
    --lab-shadow-sm: 0 1px 2px rgba(28, 25, 23, 0.06);
    --lab-shadow-md: 0 8px 24px rgba(28, 25, 23, 0.1), 0 2px 6px rgba(28, 25, 23, 0.04);
    --lab-shadow-menu: 0 16px 40px rgba(28, 25, 23, 0.14), 0 4px 12px rgba(28, 25, 23, 0.06);
    --lab-tint: rgba(28, 25, 23, 0.06);
    --lab-tint-strong: rgba(28, 25, 23, 0.12);
    --lab-mark-bg: linear-gradient(145deg, #4a6278 0%, #2f4759 100%);
    --lab-mark-ink: #fffcf7;
    --lab-error: #9f2c2c;
    color-scheme: light;
    --lab-radius-sm: 8px;
    --lab-radius-md: 12px;
    --lab-radius-pill: 999px;
    --lab-font-ui: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
    --lab-font-display: Georgia, "Iowan Old Style", "Palatino Linotype", Palatino, "Times New Roman", serif;
    --lab-header-max: 56rem;
    --tsl-lab-header-block: 0px;
    --tsl-lab-contents-width: min(16.5rem, 42vw);
    /* 16px avoids iOS Safari focus-zoom on selects and inputs */
    --lab-control-font-size: 1rem;
    --lab-read-progress: #2f8f52;
    --lab-read-progress-track: color-mix(in srgb, var(--lab-border-strong) 85%, transparent);
}

/* —— Reader theme → lab chrome ——
   The T menu "Page colour" (reader:prefs theme) is stamped on <html> as
   data-tsl-reader-theme (inline script in lab/index.html before paint, then lab.js on
   tsl:readingprefs), so header, menu, contents and stage follow the page palette
   (player/tsl.css .tsl-root[data-tsl-reader-theme]). Light = the :root defaults. */

html[data-tsl-reader-theme="sepia"] {
    --lab-bg: #e8dfd0;
    --lab-bg-subtle: linear-gradient(180deg, #ece4d6 0%, #e2d8c6 100%);
    --lab-surface: #f4ecdd;
    --lab-surface-elevated: #f9f3e8;
    --lab-ink: #433a2e;
    --lab-ink-muted: #6e6150;
    --lab-ink-faint: #8a7a64;
    --lab-border: rgba(67, 58, 46, 0.14);
    --lab-border-strong: rgba(67, 58, 46, 0.22);
    --lab-accent: #8a6440;
    --lab-accent-hover: #6f4f31;
    --lab-accent-soft: #ead9c1;
    --lab-accent-ring: rgba(138, 100, 64, 0.35);
    --lab-shadow-sm: 0 1px 2px rgba(67, 58, 46, 0.08);
    --lab-shadow-md: 0 8px 24px rgba(67, 58, 46, 0.12), 0 2px 6px rgba(67, 58, 46, 0.05);
    --lab-shadow-menu: 0 16px 40px rgba(67, 58, 46, 0.16), 0 4px 12px rgba(67, 58, 46, 0.07);
    --lab-tint: rgba(67, 58, 46, 0.07);
    --lab-tint-strong: rgba(67, 58, 46, 0.14);
    --lab-mark-bg: linear-gradient(145deg, #9a7550 0%, #6f4f31 100%);
    --lab-mark-ink: #f9f3e8;
    --lab-error: #9a3324;
    color-scheme: light;
}

html[data-tsl-reader-theme="dark"] {
    --lab-bg: #121110;
    --lab-bg-subtle: linear-gradient(180deg, #171614 0%, #0f0e0d 100%);
    --lab-surface: #1e1c19;
    --lab-surface-elevated: #2a2723;
    --lab-ink: #d2cdc4;
    --lab-ink-muted: #a39d92;
    --lab-ink-faint: #857f75;
    --lab-border: rgba(210, 205, 196, 0.12);
    --lab-border-strong: rgba(210, 205, 196, 0.2);
    --lab-accent: #8fb0cb;
    --lab-accent-hover: #abc5da;
    --lab-accent-soft: rgba(143, 176, 203, 0.16);
    --lab-accent-ring: rgba(143, 176, 203, 0.4);
    --lab-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --lab-shadow-md: 0 8px 24px rgba(0, 0, 0, 0.45), 0 2px 6px rgba(0, 0, 0, 0.3);
    --lab-shadow-menu: 0 16px 40px rgba(0, 0, 0, 0.55), 0 4px 12px rgba(0, 0, 0, 0.35);
    --lab-tint: rgba(210, 205, 196, 0.07);
    --lab-tint-strong: rgba(210, 205, 196, 0.18);
    --lab-mark-bg: linear-gradient(145deg, #5b7790 0%, #3d5a73 100%);
    --lab-mark-ink: #f1ede6;
    --lab-error: #e08a7e;
    color-scheme: dark;
}

html[data-tsl-reader-theme] {
    background: var(--lab-bg);
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    height: 100dvh;
    max-height: 100dvh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    font-family: var(--lab-font-ui);
    font-size: 0.875rem;
    line-height: 1.45;
    color: var(--lab-ink);
    background: var(--lab-bg-subtle);
    -webkit-font-smoothing: antialiased;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

/* —— Floating lab shell (T) —— */

.tsl-lab-fab-root {
    position: fixed;
    z-index: 300;
    top: max(0.65rem, env(safe-area-inset-top, 0));
    right: max(0.65rem, env(safe-area-inset-right, 0));
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    pointer-events: none;
    transition: opacity 0.28s ease, transform 0.28s ease;
}

@media (max-width: 899px) {
    .tsl-lab-fab-root.is-collapsed:not(.is-open) {
        opacity: 0;
        transform: translateY(-0.4rem);
        pointer-events: none;
    }

    .tsl-lab-fab-root.is-collapsed:not(.is-open) .tsl-lab-fab {
        pointer-events: none;
    }
}

.tsl-lab-fab {
    position: relative;
    z-index: 3;
    pointer-events: auto;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.75rem;
    height: 2.75rem;
    padding: 0;
    border: 2px solid var(--lab-read-progress-track);
    border-radius: var(--lab-radius-md);
    background: color-mix(in srgb, var(--lab-surface) 94%, transparent);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    cursor: pointer;
    box-shadow: var(--lab-shadow-md);
    transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.22s ease;
    --tsl-lab-read-progress: 0;
}

/* Reading progress: clockwise from 12 o'clock (6 o'clock ≈ 50%). */
.tsl-lab-fab::before {
    content: "";
    position: absolute;
    inset: -2px;
    border-radius: inherit;
    padding: 2px;
    box-sizing: border-box;
    background: conic-gradient(
        from 0deg,
        var(--lab-read-progress) calc(var(--tsl-lab-read-progress, 0) * 1turn),
        transparent 0
    );
    -webkit-mask:
        linear-gradient(#000 0 0) content-box,
        linear-gradient(#000 0 0);
    -webkit-mask-composite: xor;
    mask:
        linear-gradient(#000 0 0) content-box,
        linear-gradient(#000 0 0);
    mask-composite: exclude;
    pointer-events: none;
    z-index: 0;
    transition: opacity 0.2s ease;
}

.tsl-lab-fab-icon {
    position: relative;
    z-index: 1;
    font-family: var(--lab-font-display);
    font-size: 1.35rem;
    font-weight: 600;
    line-height: 1;
    color: var(--lab-accent-hover);
}

.tsl-lab-fab:hover {
    border-color: var(--lab-accent);
}

.tsl-lab-fab.is-open {
    border-color: var(--lab-accent);
    box-shadow: 0 0 0 3px var(--lab-accent-ring), var(--lab-shadow-md);
    transform: rotate(-4deg) scale(1.02);
}

.tsl-lab-fab:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--lab-accent-ring), var(--lab-shadow-md);
}

.tsl-lab-fab-backdrop {
    position: fixed;
    inset: 0;
    z-index: 1;
    background: rgba(28, 25, 23, 0.22);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease, visibility 0s linear 0.25s;
    pointer-events: none;
}

html[data-tsl-reader-theme="dark"] .tsl-lab-fab-backdrop {
    background: rgba(0, 0, 0, 0.45);
}

.tsl-lab-fab-root.is-open .tsl-lab-fab-backdrop {
    opacity: 1;
    visibility: visible;
    transition: opacity 0.25s ease;
    pointer-events: auto;
}

.tsl-lab-panel {
    position: absolute;
    top: calc(100% + 0.55rem);
    right: 0;
    z-index: 4;
    width: min(22rem, calc(100vw - 1.25rem));
    max-height: min(78dvh, calc(100dvh - 5rem));
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px) scale(0.94);
    transform-origin: top right;
    transition:
        opacity 0.24s ease,
        transform 0.24s cubic-bezier(0.22, 1, 0.36, 1),
        visibility 0s linear 0.24s;
    pointer-events: none;
}

.tsl-lab-fab-root.is-open .tsl-lab-panel {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
    transition:
        opacity 0.24s ease,
        transform 0.24s cubic-bezier(0.22, 1, 0.36, 1);
    pointer-events: auto;
}

.tsl-lab-panel-inner {
    max-height: inherit;
    overflow-x: hidden;
    overflow-y: auto;
    overscroll-behavior: contain;
    padding: 0.85rem 1rem 1rem;
    background: var(--lab-surface-elevated);
    border: 1px solid var(--lab-border);
    border-radius: var(--lab-radius-md);
    box-shadow: var(--lab-shadow-menu);
}

.tsl-lab-panel-title {
    margin: 0 0 0.65rem;
    font-family: var(--lab-font-display);
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--lab-ink);
}

.tsl-lab-toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.4rem 0.5rem;
    margin-bottom: 0.5rem;
}

.tsl-lab-toolbar .tsl-lab-sample-label {
    flex: 1 1 9rem;
    min-width: 0;
}

.tsl-lab-read-heading {
    margin: 0.75rem 0 0.65rem;
    padding-top: 0.65rem;
    border-top: 1px solid var(--lab-border);
    font-family: var(--lab-font-display);
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--lab-ink);
}

/* —— Lab panel tabs —— */

.tsl-lab-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
    margin: 0.5rem 0 0.65rem;
    padding: 0.2rem;
    border-radius: var(--lab-radius-sm);
    background: var(--lab-tint);
}

.tsl-lab-tab {
    flex: 1 1 auto;
    min-width: 0;
    margin: 0;
    padding: 0.4rem 0.45rem;
    border: 0;
    border-radius: calc(var(--lab-radius-sm) - 2px);
    background: transparent;
    font-family: var(--lab-font-ui);
    font-size: 0.78rem;
    font-weight: 600;
    line-height: 1.2;
    color: var(--lab-ink-muted);
    cursor: pointer;
    transition: background 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
}

.tsl-lab-tab:hover {
    color: var(--lab-ink);
}

.tsl-lab-tab:focus-visible {
    outline: 2px solid var(--lab-accent-ring);
    outline-offset: 1px;
}

.tsl-lab-tab.is-on {
    background: var(--lab-surface-elevated);
    color: var(--lab-ink);
    box-shadow: var(--lab-shadow-sm);
}

.tsl-lab-prefs-host {
    min-height: 0;
}

.tsl-lab-tab-panel {
    padding-top: 0.15rem;
}

.tsl-lab-tab-panel[hidden] {
    display: none !important;
}

.tsl-lab-tab-panel .tsl-lab-read-foot {
    margin-top: 0.75rem;
}

.tsl-lab-search-field {
    display: block;
    margin-bottom: 0.45rem;
}

.tsl-lab-search-input {
    box-sizing: border-box;
    width: 100%;
    padding: 0.45rem 0.55rem;
    border: 1px solid var(--lab-border-strong);
    border-radius: var(--lab-radius-sm);
    font: inherit;
    font-size: var(--lab-control-font-size);
    color: var(--lab-ink);
    background: var(--lab-surface);
}

.tsl-lab-search-input:focus-visible {
    outline: 2px solid var(--lab-accent-ring);
    outline-offset: 1px;
    border-color: var(--lab-accent);
}

.tsl-lab-search-run {
    width: 100%;
    margin-bottom: 0.5rem;
}

.tsl-lab-search-status {
    margin: 0 0 0.4rem;
    font-size: 0.8rem;
    color: var(--lab-ink-muted);
}

.tsl-lab-search-results {
    margin: 0;
    padding: 0;
    list-style: none;
}

.tsl-lab-search-results li {
    margin: 0 0 0.35rem;
}

.tsl-lab-search-hit {
    display: block;
    width: 100%;
    padding: 0.45rem 0.5rem;
    border: 1px solid var(--lab-border);
    border-radius: var(--lab-radius-sm);
    background: var(--lab-surface);
    font: inherit;
    font-size: 0.8rem;
    line-height: 1.35;
    text-align: left;
    color: var(--lab-ink);
    cursor: pointer;
}

.tsl-lab-search-hit:hover {
    border-color: var(--lab-border-strong);
    background: color-mix(in srgb, var(--lab-accent-soft) 35%, var(--lab-surface));
}

.tsl-lab-search-hit:focus-visible {
    outline: 2px solid var(--lab-accent-ring);
    outline-offset: 1px;
}

.tsl-lab-search-hit.is-active {
    border-color: var(--lab-accent);
    background: color-mix(in srgb, var(--lab-accent-soft) 55%, var(--lab-surface));
}

.tsl-lab-search-hit mark {
    padding: 0 0.1em;
    border-radius: 2px;
    background: color-mix(in srgb, var(--lab-accent-soft) 70%, transparent);
    font-weight: 600;
}

.tsl-lab-bookmark-add {
    width: 100%;
    margin-bottom: 0.35rem;
}

.tsl-lab-bookmark-hint {
    margin: 0 0 0.55rem;
}

.tsl-lab-bookmark-list {
    margin: 0;
    padding: 0;
    list-style: none;
}

.tsl-lab-bookmark-list li {
    display: flex;
    align-items: stretch;
    gap: 0.35rem;
    margin: 0 0 0.35rem;
}

.tsl-lab-bookmark-go {
    flex: 1 1 auto;
    min-width: 0;
    padding: 0.45rem 0.5rem;
    border: 1px solid var(--lab-border);
    border-radius: var(--lab-radius-sm);
    background: var(--lab-surface);
    font: inherit;
    font-size: 0.8rem;
    line-height: 1.35;
    text-align: left;
    color: var(--lab-ink);
    cursor: pointer;
}

.tsl-lab-bookmark-go:hover {
    border-color: var(--lab-border-strong);
    background: color-mix(in srgb, var(--lab-accent-soft) 35%, var(--lab-surface));
}

.tsl-lab-bookmark-remove {
    flex: 0 0 auto;
    margin: 0;
    padding: 0.35rem 0.55rem;
    border: 1px solid var(--lab-border);
    border-radius: var(--lab-radius-sm);
    background: var(--lab-surface);
    font: inherit;
    font-size: 0.75rem;
    color: var(--lab-ink-muted);
    cursor: pointer;
}

.tsl-lab-bookmark-remove:hover {
    color: var(--lab-error);
    border-color: color-mix(in srgb, var(--lab-error) 40%, var(--lab-border));
}

.tsl-lab-bookmark-empty {
    margin: 0;
    font-size: 0.8rem;
    color: var(--lab-ink-faint);
}

.tsl-root [data-tsl-block-id].tsl-lab-search-flash,
.studio-lean-tsl [data-tsl-block-id].tsl-lab-search-flash {
    outline: 2px solid var(--lab-accent);
    outline-offset: 2px;
}

.tsl-root mark.tsl-lab-doc-mark--search,
.studio-lean-tsl mark.tsl-lab-doc-mark--search {
    padding: 0 0.05em;
    border-radius: 2px;
    background: color-mix(in srgb, #e6c200 55%, transparent);
    color: inherit;
}

.tsl-root [data-tsl-block-id].tsl-lab-bookmark-target,
.studio-lean-tsl [data-tsl-block-id].tsl-lab-bookmark-target {
    border-radius: 3px;
    box-shadow: inset 0 0 0 2px color-mix(in srgb, var(--lab-read-progress, #2f8f52) 55%, transparent);
    background: color-mix(in srgb, var(--lab-read-progress, #2f8f52) 12%, transparent);
}

/* —— Toolbar controls (panel + legacy) —— */

.tsl-lab-bar {
    display: flex;
    flex-wrap: nowrap;
    align-items: center;
    gap: 0.45rem 0.65rem;
    overflow: visible;
    max-width: var(--lab-header-max);
    margin: 0 auto;
    min-height: 2.35rem;
    padding: 0.35rem 0.55rem;
    background: var(--lab-surface);
    border: 1px solid var(--lab-border);
    border-radius: var(--lab-radius-md);
    box-shadow: var(--lab-shadow-sm);
}

.tsl-lab-bar-scroll {
    display: flex;
    flex: 1 1 auto;
    flex-wrap: nowrap;
    align-items: center;
    gap: 0.45rem 0.65rem;
    min-width: 0;
    overflow-x: auto;
    overflow-y: visible;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
}

.tsl-lab-mark {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.85rem;
    height: 1.85rem;
    font-family: var(--lab-font-display);
    font-size: 0.62rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    color: var(--lab-mark-ink);
    background: var(--lab-mark-bg);
    border-radius: 6px;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.15), var(--lab-shadow-sm);
}

/* Segmented control */

.tsl-lab-seg {
    display: inline-flex;
    padding: 3px;
    gap: 2px;
    background: var(--lab-tint);
    border-radius: var(--lab-radius-pill);
    border: 1px solid var(--lab-border);
}

.tsl-lab-seg button {
    font: inherit;
    font-size: 0.78rem;
    font-weight: 500;
    padding: 0.35rem 0.85rem;
    border: none;
    border-radius: var(--lab-radius-pill);
    background: transparent;
    color: var(--lab-ink-muted);
    cursor: pointer;
    transition: background 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
}

.tsl-lab-seg button:hover {
    color: var(--lab-ink);
}

.tsl-lab-seg button.is-on,
.tsl-lab-seg button[aria-checked="true"] {
    background: var(--lab-surface-elevated);
    color: var(--lab-ink);
    box-shadow: var(--lab-shadow-sm);
}

.tsl-lab-sample-label {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    margin: 0;
    min-width: 0;
    flex: 1 1 12rem;
}

.tsl-lab-sample-text {
    flex-shrink: 0;
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--lab-ink-faint);
}

.tsl-lab-select-wrap {
    position: relative;
    display: block;
    min-width: 0;
    flex: 1;
}

.tsl-lab-select-wrap::after {
    content: "";
    position: absolute;
    right: 0.75rem;
    top: 50%;
    width: 0.45rem;
    height: 0.45rem;
    border-right: 2px solid var(--lab-ink-faint);
    border-bottom: 2px solid var(--lab-ink-faint);
    transform: translateY(-65%) rotate(45deg);
    pointer-events: none;
}

.tsl-lab-sample-label select {
    appearance: none;
    font-family: var(--lab-font-ui);
    font-size: var(--lab-control-font-size);
    font-weight: 500;
    line-height: 1.25;
    color: var(--lab-ink);
    width: 100%;
    min-width: 8rem;
    max-width: 100%;
    padding: 0.3rem 1.75rem 0.3rem 0.55rem;
    border: 1px solid var(--lab-border-strong);
    border-radius: var(--lab-radius-sm);
    background: var(--lab-surface-elevated);
    cursor: pointer;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.tsl-lab-sample-label select:hover {
    border-color: var(--lab-accent-ring);
}

.tsl-lab-sample-label select:focus {
    outline: none;
    border-color: var(--lab-accent);
    box-shadow: 0 0 0 3px var(--lab-accent-ring);
}

.tsl-lab-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font: inherit;
    font-size: 0.8125rem;
    font-weight: 500;
    padding: 0.35rem 0.7rem;
    border-radius: var(--lab-radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
    white-space: nowrap;
}

.tsl-lab-btn-secondary {
    color: var(--lab-ink);
    background: var(--lab-surface-elevated);
    border-color: var(--lab-border-strong);
}

.tsl-lab-btn-secondary:hover {
    border-color: var(--lab-accent);
    background: var(--lab-accent-soft);
}

.tsl-lab-btn-ghost {
    color: var(--lab-accent);
    background: transparent;
    border-color: transparent;
    padding-left: 0.5rem;
    padding-right: 0.5rem;
}

.tsl-lab-btn-ghost:hover {
    background: var(--lab-accent-soft);
}

.tsl-lab-file-label {
    cursor: pointer;
    margin: 0;
}

.tsl-lab-file-label .tsl-lab-btn {
    pointer-events: none;
}

.tsl-lab-read {
    margin: 0;
    padding: 0;
    background: transparent;
    border: none;
}

.tsl-lab-read-row {
    display: grid;
    grid-template-columns: 5.25rem minmax(0, 1fr);
    align-items: center;
    gap: 0.5rem 0.75rem;
    margin-bottom: 0.65rem;
}

.tsl-lab-read-row[hidden] {
    display: none;
}

/* A pref that does not apply to the current layout (tsl.js readingPrefApplies). */
.tsl-lab-read-row[data-tsl-unavailable] .tsl-lab-read-label {
    opacity: 0.6;
}

.tsl-lab-read-row[data-tsl-unavailable] .tsl-lab-seg {
    opacity: 0.45;
}

.tsl-lab-read .tsl-lab-seg button:disabled,
.tsl-lab-read .tsl-lab-seg button[aria-disabled="true"] {
    cursor: not-allowed;
    color: var(--lab-ink-faint);
}

.tsl-lab-read .tsl-lab-seg button:disabled:hover {
    color: var(--lab-ink-faint);
}

.tsl-lab-read-note {
    grid-column: 2;
    margin-top: -0.25rem;
    font-size: 0.7rem;
    line-height: 1.3;
    color: var(--lab-ink-faint);
}

.tsl-lab-read-note[hidden] {
    display: none;
}

.tsl-lab-read-heading--sub {
    margin-top: 0.85rem;
    font-size: 0.72rem;
}

.tsl-lab-read-note--block {
    grid-column: 1 / -1;
    margin-top: 0.15rem;
}

.tsl-lab-read-row--toggle {
    align-items: center;
}

.tsl-lab-toggle {
    justify-self: end;
    min-width: 3.25rem;
    padding: 0.3rem 0.65rem;
    border: 1px solid var(--lab-border-strong);
    border-radius: var(--lab-radius-pill);
    background: var(--lab-surface-elevated);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--lab-ink-muted);
    cursor: pointer;
    transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.tsl-lab-toggle.is-on {
    border-color: var(--lab-accent);
    background: var(--lab-accent-soft);
    color: var(--lab-accent-hover);
}

.tsl-lab-toggle:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--lab-accent-ring);
}

.tsl-lab-read-row:last-of-type {
    margin-bottom: 0;
}

.tsl-lab-read-label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--lab-ink-faint);
}

.tsl-lab-read .tsl-lab-seg {
    width: fit-content;
    max-width: 100%;
    flex-wrap: wrap;
}

.tsl-lab-read .tsl-lab-seg button {
    font-size: 0.75rem;
    padding: 0.3rem 0.6rem;
}

.tsl-lab-sizes {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

.tsl-lab-size-step {
    font: inherit;
    font-size: 0.75rem;
    font-weight: 600;
    min-width: 2rem;
    height: 2rem;
    padding: 0;
    border: 1px solid var(--lab-border-strong);
    border-radius: var(--lab-radius-sm);
    background: var(--lab-surface);
    color: var(--lab-ink-muted);
    cursor: pointer;
}

.tsl-lab-size-step:hover {
    border-color: var(--lab-accent);
    color: var(--lab-ink);
}

.tsl-lab-steps {
    display: inline-flex;
    gap: 0.25rem;
    padding: 0 0.15rem;
}

.tsl-lab-steps button {
    width: 0.55rem;
    height: 0.55rem;
    padding: 0;
    border-radius: 50%;
    border: 1px solid var(--lab-border-strong);
    background: var(--lab-tint-strong);
    cursor: pointer;
    transition: transform 0.12s ease, background 0.12s ease, border-color 0.12s ease;
}

.tsl-lab-steps button:hover {
    transform: scale(1.15);
}

.tsl-lab-steps button.is-on,
.tsl-lab-steps button[aria-checked="true"] {
    background: var(--lab-accent);
    border-color: var(--lab-accent);
    transform: scale(1.2);
}

.tsl-lab-read-foot {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 0.85rem;
    padding-top: 0.65rem;
    border-top: 1px solid var(--lab-border);
    font-size: 0.72rem;
    color: var(--lab-ink-faint);
}

.tsl-lab-read-foot button {
    font: inherit;
    font-size: 0.75rem;
    font-weight: 500;
    padding: 0.25rem 0.5rem;
    border: none;
    border-radius: 6px;
    background: transparent;
    color: var(--lab-accent);
    cursor: pointer;
}

.tsl-lab-read-foot button:hover {
    background: var(--lab-accent-soft);
}

/* Status */

.tsl-lab-status {
    margin: 0 0 0.35rem;
    min-width: 0;
    font-size: 0.72rem;
    color: var(--lab-ink-faint);
    line-height: 1.35;
    padding: 0;
}

.tsl-lab-status:empty {
    display: none;
}

.tsl-lab-status:not(:empty) {
    color: var(--lab-ink-muted);
}

.tsl-lab-status.is-error {
    color: var(--lab-error);
}

@media (max-width: 768px) {
    .tsl-lab-body[data-tsl-lab-contents-open] .tsl-lab-stage {
        margin-left: 0;
    }

    .tsl-lab-contents {
        top: env(safe-area-inset-top, 0);
        width: min(18rem, 92vw);
        max-width: min(18rem, 92vw);
        box-shadow: var(--lab-shadow-md);
    }

    .tsl-lab-read-row {
        grid-template-columns: 1fr;
        gap: 0.35rem;
        align-items: stretch;
    }

    .tsl-lab-read .tsl-lab-seg {
        width: 100%;
    }

    .tsl-lab-read .tsl-lab-seg button {
        flex: 1 1 0;
        min-width: 0;
    }

    .tsl-lab-sizes {
        flex-wrap: wrap;
        width: 100%;
    }

    .tsl-lab-float {
        padding: 0.35rem max(0.45rem, env(safe-area-inset-right, 0))
            max(0.35rem, env(safe-area-inset-bottom, 0)) 0.45rem;
    }
}

/* Document layout + contents panel */

.tsl-lab-body {
    flex: 1 1 0;
    min-height: 0;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.tsl-lab-contents {
    position: fixed;
    z-index: 90;
    top: max(0.5rem, env(safe-area-inset-top, 0));
    left: 0;
    bottom: 0;
    width: var(--tsl-lab-contents-width);
    max-width: var(--tsl-lab-contents-width);
    display: flex;
    flex-direction: column;
    min-height: 0;
    overflow: hidden;
    background: var(--lab-surface);
    border-right: 1px solid var(--lab-border);
    box-shadow: var(--lab-shadow-sm);
}

.tsl-lab-body[data-tsl-lab-contents-open] .tsl-lab-stage {
    margin-left: var(--tsl-lab-contents-width);
}

.tsl-lab-contents[hidden] {
    display: none !important;
}

.tsl-lab-contents-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    padding: 0.65rem 0.75rem;
    border-bottom: 1px solid var(--lab-border);
}

.tsl-lab-contents-title {
    margin: 0;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    color: var(--lab-ink-muted);
}

.tsl-lab-contents-close {
    border: 0;
    background: transparent;
    color: var(--lab-ink-muted);
    font-size: 1.25rem;
    line-height: 1;
    padding: 0.15rem 0.35rem;
    border-radius: var(--lab-radius-sm);
    cursor: pointer;
}

.tsl-lab-contents-close:hover {
    background: var(--lab-accent-soft);
    color: var(--lab-ink);
}

.tsl-lab-toc {
    flex: 1 1 auto;
    min-height: 0;
    overflow: auto;
    overscroll-behavior: contain;
    padding: 0.5rem 0.65rem 1rem;
    font-size: 0.8125rem;
}

.tsl-lab-toc-empty {
    margin: 0.75rem 0;
    color: var(--lab-ink-faint);
    font-style: italic;
}

.tsl-lab-toc-link {
    display: block;
    padding: 0.28rem 0.35rem;
    border-radius: var(--lab-radius-sm);
    color: var(--lab-ink);
    text-decoration: none;
}

.tsl-lab-toc-link:hover {
    background: var(--lab-accent-soft);
}

.tsl-lab-toc-link--h2 {
    padding-left: 0.85rem;
}

.tsl-lab-toc-link--h3 {
    padding-left: 1.35rem;
    font-size: 0.95em;
}

@media (max-width: 900px) {
    .tsl-lab-contents {
        width: min(18rem, 88vw);
        max-width: min(18rem, 88vw);
    }

    .tsl-lab-body[data-tsl-lab-contents-open] .tsl-lab-stage {
        margin-left: min(18rem, 88vw);
    }
}

/* Reader mount */

.tsl-lab-stage {
    flex: 1 1 auto;
    min-height: 0;
    min-width: 0;
    height: 100%;
    max-height: 100%;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-sizing: border-box;
    transition: margin-left 0.2s ease;
}

.tsl-lab-mount {
    flex: 1 1 auto;
    min-height: 0;
    display: flex;
    flex-direction: column;
}

.tsl-lab-mount .tsl-root[data-tsl-layout="pages"] {
    flex: 1 1 auto;
    min-height: 0;
    max-height: 100%;
    height: auto;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    padding-bottom: 0.5rem;
}

.tsl-lab-mount .tsl-root[data-tsl-compact-pager="1"][data-tsl-layout="pages"] {
    flex: 1 1 0;
    height: 100%;
    padding-bottom: 0;
    padding-top: 0;
}

.tsl-lab-mount .tsl-pager-wrap {
    flex: 1 1 auto;
    min-height: 0;
}

/* Scroll layout: continuous lean HTML — stage scrolls, not the pages pager */
.tsl-lab-stage[data-tsl-lab-scroll="1"],
.tsl-lab-stage:has(.document-tsl[data-tsl-layout="scroll"]) {
    overflow-x: hidden;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
}

.tsl-lab-mount:has(.document-tsl[data-tsl-layout="scroll"]),
[data-tsl-mount][data-tsl-layout="scroll"] {
    overflow: visible;
    min-height: 0;
    flex: 1 1 auto;
}

.tsl-lab-mount .document-tsl[data-tsl-layout="scroll"] {
    flex: none;
    width: 100%;
    max-width: 100%;
    padding: max(0.75rem, env(safe-area-inset-top, 0)) max(0.75rem, env(safe-area-inset-right, 0)) 2rem
        max(0.75rem, env(safe-area-inset-left, 0));
    box-sizing: border-box;
}

/* Floating footer (GitHub + Liberapay) */

.tsl-lab-float {
    position: fixed;
    bottom: 0;
    right: 0;
    z-index: 50;
    display: flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.45rem 0.55rem;
}

.tsl-lab-float-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    border-radius: var(--lab-radius-sm);
    color: var(--lab-ink-muted);
    background: color-mix(in srgb, var(--lab-surface) 88%, transparent);
    border: 1px solid var(--lab-border);
    box-shadow: var(--lab-shadow-sm);
    transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.tsl-lab-float-link:hover {
    color: var(--lab-ink);
    border-color: var(--lab-border-strong);
    background: var(--lab-surface-elevated);
}

.tsl-lab-float-link:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--lab-accent-ring);
}

.tsl-lab-float-icon {
    display: block;
    width: 1.25rem;
    height: 1.25rem;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

@media print {
    .tsl-lab-fab-root,
    .tsl-lab-float,
    .tsl-lab-contents {
        display: none !important;
    }

    html,
    body {
        height: auto !important;
        max-height: none !important;
        overflow: visible !important;
        background: #fff !important;
    }

    body {
        min-height: auto;
        display: block !important;
    }

    .tsl-lab-body,
    .tsl-lab-stage,
    .tsl-lab-mount {
        flex: none !important;
        height: auto !important;
        max-height: none !important;
        min-height: 0 !important;
        overflow: visible !important;
    }

    .tsl-lab-mount .tsl-root[data-tsl-layout="pages"],
    .tsl-lab-mount .tsl-pager-wrap {
        flex: none !important;
        max-height: none !important;
        overflow: visible !important;
    }

    .tsl-lab-mount {
        min-height: auto;
    }
}