:root {
    --reading-font: "Source Serif 4", Georgia, serif;
    --ui-font: "Source Sans 3", system-ui, sans-serif;
    --text-scale: 1;

    --bg-page: #161412;
    --bg-surface: #221f1b;
    --bg-elevated: #2a2621;
    --border: #3a342c;
    --text: #e8e0d4;
    --text-muted: #9a9084;
    --accent: #c4a36a;
    --accent-hover: #d4b57e;
    --on-accent: #161412;
    --focus-ring: #c4a36a;
    --danger: #d16b5a;
    --shadow: 0 12px 32px rgba(0, 0, 0, 0.35);

    --primary-accent: var(--accent);
    --primary-hover: var(--accent-hover);

    --header-height: 64px;
    --radius: 8px;
    --radius-sm: 6px;
}

html.light-mode,
body.light-mode {
    --bg-page: #f6f1e8;
    --bg-surface: #fffdf8;
    --bg-elevated: #ffffff;
    --border: #e4dccb;
    --text: #2c2416;
    --text-muted: #6b6258;
    --accent: #9a7b4f;
    --accent-hover: #7d623d;
    --on-accent: #fffdf8;
    --focus-ring: #9a7b4f;
    --danger: #b54538;
    --shadow: 0 12px 32px rgba(44, 36, 22, 0.12);
}

@media (prefers-color-scheme: light) {
    html:not(.theme-dark) {
        --bg-page: #f6f1e8;
        --bg-surface: #fffdf8;
        --bg-elevated: #ffffff;
        --border: #e4dccb;
        --text: #2c2416;
        --text-muted: #6b6258;
        --accent: #9a7b4f;
        --accent-hover: #7d623d;
        --on-accent: #fffdf8;
        --focus-ring: #9a7b4f;
        --danger: #b54538;
        --shadow: 0 12px 32px rgba(44, 36, 22, 0.12);
        color-scheme: light;
    }
}

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

html {
    color-scheme: dark;
}

html.light-mode,
body.light-mode {
    color-scheme: light;
}

body {
    background-color: var(--bg-page);
    color: var(--text);
    font-family: var(--reading-font);
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header.app-header,
.chrome-nav,
.toolbar,
#picker-modal {
    user-select: none;
    -webkit-user-select: none;
}

#quick-jump {
    user-select: text !important;
    -webkit-user-select: text !important;
}

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

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

/* ---------- Header ---------- */

.app-header {
    position: sticky;
    top: 0;
    z-index: 200;
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 10px 20px;
    min-height: var(--header-height);
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    font-family: var(--ui-font);
}

.logo {
    font-family: var(--reading-font);
    font-weight: 600;
    font-size: 1.15rem;
    letter-spacing: 0.08em;
    color: var(--accent);
    text-transform: none;
    font-variant: small-caps;
    cursor: pointer;
    white-space: nowrap;
    flex-shrink: 0;
}

.logo i {
    margin-right: 8px;
    font-variant: normal;
    text-transform: none;
}

.hamburger {
    display: none;
    background: transparent;
    border: none;
    color: var(--accent);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 8px 10px;
    border-radius: var(--radius-sm);
}

.hamburger:hover {
    background: var(--bg-elevated);
    color: var(--accent-hover);
}

.chrome-nav {
    display: flex;
    align-items: center;
    gap: 10px;
    flex: 1;
    min-width: 0;
}

.jump-group {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 1;
    min-width: 0;
    max-width: 280px;
}

.toolbar {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-left: auto;
    flex-shrink: 0;
}

.tool-group {
    position: relative;
}

.toolbar-btn {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    background: transparent;
    color: var(--text-muted);
    border: 1px solid transparent;
    padding: 7px 11px;
    border-radius: var(--radius-sm);
    font-family: var(--ui-font);
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    cursor: pointer;
}

.toolbar-btn:hover,
.tool-group.open .toolbar-btn {
    color: var(--text);
    background: var(--bg-elevated);
    border-color: var(--border);
}

.toolbar-btn[aria-expanded="true"] {
    color: var(--accent);
    border-color: var(--accent);
}

.popover {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 240px;
    padding: 8px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    z-index: 250;
}

.tool-group.open .popover {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.menu-label {
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
    padding: 8px 10px 4px;
}

.menu-item {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    background: transparent;
    color: var(--text);
    border: none;
    border-radius: var(--radius-sm);
    padding: 8px 10px;
    font-family: var(--ui-font);
    font-size: 0.9rem;
    font-weight: 500;
    text-align: left;
    cursor: pointer;
    text-decoration: none;
}

button.menu-item,
button.toolbar-btn,
button.hamburger,
button.close-modal,
button.picker-tab {
    background: transparent;
    box-shadow: none;
}

.menu-item i,
.menu-item .menu-icon {
    width: 18px;
    text-align: center;
    color: var(--text-muted);
}

.menu-item:hover {
    background: var(--bg-surface);
    color: var(--text);
}

.menu-item.is-on,
.menu-item[aria-pressed="true"] {
    color: var(--accent);
}

.menu-item.is-on i,
.menu-item[aria-pressed="true"] i {
    color: var(--accent);
}

.menu-item.is-hidden {
    display: none !important;
}

.menu-row {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 10px;
}

.size-btns {
    display: flex;
    gap: 6px;
    margin-left: auto;
}

.size-btns .menu-item {
    width: auto;
    padding: 6px 10px;
}

/* ---------- Forms ---------- */

select,
input[type="text"] {
    background-color: var(--bg-elevated);
    color: var(--text);
    border: 1px solid var(--border);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-family: var(--ui-font);
    font-size: 0.95rem;
    transition: border-color 0.15s, box-shadow 0.15s;
}

select {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 512 512'%3e%3cpath fill='%23c4a36a' d='M233.4 406.6c12.5 12.5 32.8 12.5 45.3 0l192-192c12.5-12.5 12.5-32.8 0-45.3s-32.8-12.5-45.3 0L256 338.7 86.6 169.4c-12.5-12.5-32.8-12.5-45.3 0s-12.5 32.8 0 45.3l192 192z'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 12px;
    padding-right: 32px;
}

html.light-mode select,
body.light-mode select {
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 512 512'%3e%3cpath fill='%239a7b4f' d='M233.4 406.6c12.5 12.5 32.8 12.5 45.3 0l192-192c12.5-12.5 12.5-32.8 0-45.3s-32.8-12.5-45.3 0L256 338.7 86.6 169.4c-12.5-12.5-32.8-12.5-45.3 0s-12.5 32.8 0 45.3l192 192z'/%3e%3c/svg%3e");
}

select:focus,
input[type="text"]:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--focus-ring) 25%, transparent);
}

select:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

#version-select {
    width: 96px;
    font-weight: 600;
    color: var(--accent);
    flex-shrink: 0;
}

#parallel-version-select {
    display: none;
    width: 96px;
    font-weight: 600;
    color: var(--text-muted);
    border-color: var(--accent);
    flex-shrink: 0;
}

#parallel-version-select.is-visible {
    display: inline-block;
}

#quick-jump {
    flex: 1;
    min-width: 0;
    width: 100%;
}

.picker-btn {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    min-width: 170px;
    background: var(--bg-elevated);
    color: var(--accent);
    border: 1px solid var(--border);
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    font-family: var(--ui-font);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    flex-shrink: 0;
}

.picker-btn:hover {
    border-color: var(--accent);
    background: var(--bg-elevated);
    color: var(--accent-hover);
}

button {
    background-color: var(--accent);
    color: var(--on-accent);
    cursor: pointer;
    font-weight: 600;
    font-family: var(--ui-font);
    border: none;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    transition: background-color 0.15s, color 0.15s, border-color 0.15s;
}

button:hover {
    background-color: var(--accent-hover);
}

.btn-secondary,
#go-btn {
    background: var(--accent);
    color: var(--on-accent);
}

.btn-ghost {
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border);
}

.btn-ghost:hover {
    background: var(--bg-elevated);
    color: var(--text);
    border-color: var(--accent);
}

/* ---------- Audio ---------- */

.custom-audio-player {
    display: none;
    align-items: center;
    gap: 14px;
    width: calc(100% - 40px);
    max-width: 640px;
    margin: 16px auto 0;
    background-color: var(--bg-surface);
    border: 1px solid var(--border);
    padding: 10px 18px;
    border-radius: var(--radius);
}

.custom-audio-player button {
    background: transparent;
    border: none;
    color: var(--text);
    font-size: 1.1rem;
    padding: 4px;
}

.custom-audio-player button:hover {
    color: var(--accent);
    background: transparent;
    transform: none;
}

#audio-repeat-btn {
    color: var(--text-muted);
}

#audio-repeat-btn.is-on {
    color: var(--accent);
}

.custom-audio-player span {
    font-family: var(--ui-font);
    font-size: 0.8rem;
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
}

#audio-progress {
    flex-grow: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 5px;
    background: var(--border);
    border-radius: 3px;
    outline: none;
    border: none;
    padding: 0;
    margin: 0;
}

#audio-progress::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
}

#voice-select {
    padding: 4px 26px 4px 10px;
    font-size: 0.8rem;
    height: 30px;
    background-position: right 8px center;
    background-size: 10px;
}

/* ---------- Reading pane ---------- */

#reading-pane {
    width: 100%;
    max-width: 42em;
    margin: 40px auto 24px;
    padding: 0 24px;
    line-height: 1.85;
    font-size: calc(1.15rem * var(--text-scale));
    font-family: var(--reading-font);
    flex: 1;
    transition: max-width 0.3s;
}

#reading-pane.parallel-active {
    max-width: 1400px;
}

.parallel-layout {
    display: flex;
}

.parallel-col {
    flex: 1;
    min-width: 0;
}

.parallel-col:first-child {
    padding-right: 36px;
    border-right: 1px solid var(--border);
}

.parallel-col:last-child {
    padding-left: 36px;
}

.placeholder-text {
    text-align: center;
    color: var(--text-muted);
    font-family: var(--ui-font);
    margin-top: 80px;
}

.placeholder-text.is-error {
    color: var(--danger);
}

.chapter-title {
    text-align: center;
    margin: 0 0 2rem;
    letter-spacing: 0.04em;
    font-family: var(--reading-font);
    font-weight: 600;
    font-size: calc(1.85rem * var(--text-scale));
    color: var(--text);
}

.version-label {
    font-size: 0.72em;
    color: var(--text-muted);
    font-family: var(--ui-font);
    font-weight: 500;
    letter-spacing: 0.06em;
    vertical-align: middle;
    margin-left: 0.4em;
}

.verse-num {
    color: var(--accent);
    font-weight: 600;
    font-family: var(--ui-font);
    font-size: calc(0.72rem * var(--text-scale));
    margin-right: 0.2em;
    margin-left: 0.35em;
}

.single-verse .verse-num {
    font-size: calc(0.9rem * var(--text-scale));
    margin-left: 0;
    margin-right: 0.4em;
}

.section-header {
    text-align: center;
    color: var(--accent);
    margin: 2.6rem 0 1rem;
    font-family: var(--reading-font);
    font-size: calc(1.15rem * var(--text-scale));
    font-style: italic;
    font-weight: 500;
    letter-spacing: 0.02em;
}

.section-header.verse-view {
    text-align: left;
    font-style: normal;
    font-variant: small-caps;
    letter-spacing: 0.06em;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.4rem;
}

.reader-paragraph {
    text-align: left;
    text-indent: 1.25em;
    font-family: var(--reading-font);
    font-size: calc(1.12rem * var(--text-scale));
    line-height: 1.85;
    margin: 0 0 1em;
}

.verse-block {
    margin: 0 0 1rem;
    font-family: var(--reading-font);
    font-size: calc(1.12rem * var(--text-scale));
    line-height: 1.75;
}

.single-verse {
    max-width: 36em;
    margin: 0 auto;
}

.single-verse p {
    font-size: calc(1.28rem * var(--text-scale));
    line-height: 1.8;
}

body:not(.show-interlinear) .interlinear-extra {
    display: none !important;
}

.interlinear-asterisk {
    color: var(--accent);
    cursor: pointer;
    font-weight: 700;
    font-size: 0.95em;
    margin-left: 3px;
}

.interlinear-asterisk:hover {
    color: var(--accent-hover);
}

.chapter-nav {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    margin-top: 3rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--border);
}

.chapter-nav button {
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border);
    font-weight: 500;
}

.chapter-nav button:hover {
    background: var(--bg-surface);
    color: var(--accent);
    border-color: var(--accent);
}

/* ---------- Landing ---------- */

.landing {
    max-width: 36em;
    margin: 48px auto 24px;
    text-align: center;
}

.landing h1 {
    font-family: var(--reading-font);
    font-weight: 600;
    font-size: 2.4rem;
    color: var(--text);
    margin: 0 0 0.6rem;
    letter-spacing: 0.02em;
}

.landing .lede {
    font-family: var(--reading-font);
    font-size: 1.15rem;
    line-height: 1.7;
    color: var(--text-muted);
    margin: 0 0 2rem;
}

.landing-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    margin-bottom: 2.5rem;
}

.landing details {
    text-align: left;
    font-family: var(--ui-font);
    border-top: 1px solid var(--border);
    padding-top: 1.25rem;
    color: var(--text-muted);
}

.landing summary {
    cursor: pointer;
    color: var(--text);
    font-weight: 600;
    list-style: none;
}

.landing summary::-webkit-details-marker {
    display: none;
}

.landing summary::after {
    content: " +";
    color: var(--accent);
}

.landing details[open] summary::after {
    content: " −";
}

.legend-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
    margin-top: 1.25rem;
}

.legend-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.legend-item i {
    width: 22px;
    margin-top: 3px;
    color: var(--accent);
    text-align: center;
}

.legend-item strong {
    display: block;
    color: var(--text);
    font-weight: 600;
    margin-bottom: 2px;
}

.legend-item span {
    font-size: 0.9rem;
    line-height: 1.45;
    color: var(--text-muted);
}

/* ---------- Modals / picker ---------- */

.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(22, 20, 18, 0.78);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

html.light-mode .modal-overlay,
body.light-mode .modal-overlay {
    background: rgba(44, 36, 22, 0.35);
}

.modal-content {
    background-color: var(--bg-surface);
    padding: 28px;
    border-radius: 12px;
    max-width: 800px;
    width: 92%;
    max-height: 82vh;
    overflow-y: auto;
    border: 1px solid var(--border);
    position: relative;
    box-shadow: var(--shadow);
}

.picker-modal-content {
    max-width: 720px;
    min-height: 400px;
}

.close-modal {
    position: absolute;
    top: 12px;
    right: 16px;
    font-size: 1.6rem;
    line-height: 1;
    cursor: pointer;
    color: var(--text-muted);
    background: none;
    border: none;
    padding: 4px 8px;
}

.close-modal:hover {
    color: var(--danger);
    background: none;
}

.picker-toolbar {
    position: relative;
    display: flex;
    justify-content: flex-start;
    align-items: center;
    margin-bottom: 18px;
    border-bottom: 1px solid var(--border);
    padding-bottom: 14px;
    min-height: 32px;
    font-family: var(--ui-font);
}

.picker-tabs {
    display: flex;
    gap: 18px;
    font-size: 1.05rem;
    font-weight: 600;
}

.picker-tab {
    cursor: pointer;
    color: var(--text-muted);
    background: none;
    border: none;
    padding: 0;
    font: inherit;
}

.picker-tab:hover {
    color: var(--text);
    background: none;
}

.picker-tab.is-active {
    color: var(--accent);
}

#toggle-abbrev-btn {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border);
    padding: 4px 14px;
    font-size: 0.82rem;
    border-radius: 999px;
    font-weight: 500;
}

#toggle-abbrev-btn:hover {
    color: var(--accent);
    border-color: var(--accent);
    background: transparent;
}

#picker-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(85px, 1fr));
    gap: 10px;
}

.picker-section-label {
    grid-column: 1 / -1;
    font-family: var(--ui-font);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin: 8px 0 2px;
}

.grid-btn {
    background-color: var(--bg-elevated);
    color: var(--text);
    border: 1px solid var(--border);
    padding: 11px 4px;
    text-align: center;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-family: var(--ui-font);
    font-size: 0.9rem;
    transition: background-color 0.15s, border-color 0.15s, color 0.15s;
}

.grid-btn:hover,
.grid-btn.is-current {
    background-color: var(--accent);
    color: var(--on-accent);
    border-color: var(--accent);
}

.grid-btn-wide {
    grid-column: 1 / -1;
    margin-bottom: 6px;
    background: transparent;
    color: var(--accent);
    border: 1px solid var(--accent);
    font-weight: 600;
}

.grid-btn-wide:hover {
    background: var(--accent);
    color: var(--on-accent);
}

.picker-status.is-error {
    color: var(--danger);
}

.size-label {
    padding: 0;
}

/* ---------- Interlinear ---------- */

.modal-ref {
    text-align: center;
    margin: 0 0 2rem;
    letter-spacing: 0.04em;
    color: var(--accent);
    font-family: var(--reading-font);
    font-size: calc(1.45rem * var(--text-scale));
    font-weight: 600;
}

.interlinear-wrap {
    display: flex;
    flex-wrap: wrap;
    gap: 22px;
    justify-content: center;
    line-height: 1.4;
}

.word-stack {
    display: flex;
    flex-direction: column;
    text-align: center;
    align-items: center;
    min-width: 60px;
}

.strongs,
.strongs-link {
    font-size: calc(0.78rem * var(--text-scale));
    font-family: ui-monospace, "Courier New", monospace;
    margin-bottom: 4px;
    color: var(--text-muted);
}

.strongs-link {
    color: var(--accent);
    text-decoration: none;
    border-bottom: 1px dashed var(--accent);
}

.strongs-link:hover {
    opacity: 0.75;
}

.word-english {
    font-size: calc(1.35rem * var(--text-scale));
    font-family: var(--reading-font);
    color: var(--text);
}

.greek-text {
    font-size: calc(1rem * var(--text-scale));
    color: var(--accent);
    margin-top: 4px;
}

.word-translit {
    font-size: calc(0.82rem * var(--text-scale));
    color: var(--accent-hover);
}

.word-parsing {
    font-size: calc(0.65rem * var(--text-scale));
    color: var(--text-muted);
    margin-top: 4px;
    font-style: italic;
    font-family: var(--ui-font);
}

.crossref-text {
    font-size: calc(0.75rem * var(--text-scale));
    color: var(--text-muted);
    margin-top: 8px;
    font-style: italic;
    max-width: 120px;
    font-family: var(--reading-font);
}

.word-footnote {
    font-size: calc(0.7rem * var(--text-scale));
    color: var(--text-muted);
    margin-top: 6px;
    border-top: 1px solid var(--border);
    padding-top: 6px;
    max-width: 140px;
    line-height: 1.3;
    font-family: var(--reading-font);
}

/* ---------- Footer / toast ---------- */

#dynamic-footer {
    text-align: center;
    padding: 36px 20px 28px;
    font-family: var(--ui-font);
    font-size: 0.82rem;
    color: var(--text-muted);
    line-height: 1.65;
}

#dynamic-footer a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
}

#dynamic-footer a:hover {
    text-decoration: underline;
}

.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(12px);
    background: var(--bg-elevated);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 12px 18px;
    font-family: var(--ui-font);
    font-size: 0.9rem;
    box-shadow: var(--shadow);
    z-index: 2000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s, transform 0.2s;
    max-width: min(90vw, 420px);
    text-align: center;
}

.toast.is-visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ---------- Print ---------- */

@media print {
    .app-header,
    .custom-audio-player,
    #dynamic-footer,
    .interlinear-asterisk,
    .chapter-nav,
    .toast {
        display: none !important;
    }

    body {
        background-color: #ffffff !important;
        color: #000000 !important;
        margin: 0 !important;
        padding: 0 !important;
    }

    #reading-pane {
        max-width: 100% !important;
        margin: 0 !important;
        padding: 10px !important;
    }

    p,
    div {
        page-break-inside: auto;
    }

    #reading-pane.parallel-active {
        max-width: 100% !important;
    }

    .parallel-layout {
        display: table !important;
        width: 100% !important;
        table-layout: fixed !important;
    }

    .parallel-col {
        display: table-cell !important;
        width: 50% !important;
        vertical-align: top;
    }

    .parallel-col:first-child {
        padding-right: 20px !important;
        border-right: 1px solid #ccc !important;
    }

    .parallel-col:last-child {
        padding-left: 20px !important;
    }

    .chapter-title,
    .section-header,
    .verse-num,
    .modal-ref {
        color: #000 !important;
    }
}

/* ---------- Mobile ---------- */

@media (max-width: 960px) {
    .app-header {
        display: grid;
        grid-template-columns: auto minmax(0, 1fr) auto;
        grid-template-rows: auto auto;
        gap: 8px 10px;
        padding: 10px 12px;
        align-items: center;
    }

    .logo {
        grid-column: 1;
        grid-row: 1;
        font-size: 1.05rem;
    }

    .hamburger {
        display: block;
        grid-column: 3;
        grid-row: 1;
        justify-self: end;
    }

    .chrome-nav {
        display: contents;
    }

    .picker-btn {
        grid-column: 2;
        grid-row: 1;
        min-width: 0;
        width: 100%;
    }

    #version-select,
    #parallel-version-select,
    .jump-group,
    .toolbar {
        display: none;
        grid-column: 1 / -1;
        grid-row: auto;
        width: 100%;
        max-width: none;
        margin: 0;
    }

    .app-header.is-open #version-select,
    .app-header.is-open #parallel-version-select.is-visible {
        display: inline-block;
    }

    .app-header.is-open .jump-group,
    .app-header.is-open .toolbar {
        display: flex;
    }

    .app-header.is-open .jump-group {
        max-width: none;
    }

    .toolbar {
        flex-direction: column;
        align-items: stretch;
        gap: 4px;
        padding: 4px 0 8px;
        border-top: 1px solid var(--border);
    }

    .toolbar-btn {
        display: none;
    }

    .popover {
        display: flex;
        flex-direction: column;
        position: static;
        min-width: 0;
        box-shadow: none;
        border: none;
        background: transparent;
        padding: 0 0 8px;
    }

    .tool-group.open .popover,
    .tool-group .popover {
        display: flex;
    }

    .parallel-layout {
        flex-direction: column;
    }

    .parallel-col:first-child {
        padding-right: 0;
        border-right: none;
        padding-bottom: 32px;
        border-bottom: 1px solid var(--border);
        margin-bottom: 32px;
    }

    .parallel-col:last-child {
        padding-left: 0;
    }

    .landing h1 {
        font-size: 1.9rem;
    }

    .chapter-nav {
        flex-direction: column;
    }

    .chapter-nav button {
        width: 100%;
    }
}