/*
 * Shared interface for the quiz and flashcard tools.
 * Flat, typographic, token-driven: see docs/design-system.md.
 */

.la {
    --la-measure: 68ch;
    --la-gap: 24px;
    --la-tap: 48px;
    --la-ease: 160ms ease;
    max-width: 920px;
    margin: 0 auto 72px;
    padding: 0 16px;
    color: var(--g-ink);
    font-family: var(--g-font-sans);
}

/* The site styles bare elements generously; inside the app every element
   starts from zero so spacing is set here, once. */
.la :where(p, ul, ol, li, h2, h3, h4, dl, dd, figure, fieldset, legend, details, summary, table) {
    margin: 0;
    padding: 0;
    border: 0;
    color: inherit;
    text-align: left;
}

.la :where(ul, ol) {
    list-style: none;
}

.la :where(li)::before {
    content: none !important;
}

.la [hidden] {
    display: none !important;
}

.la-sr {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
}

/* Intro shrinks out of the way while a session runs. */
body.la-focus .learn-intro,
body.la-focus .breadcrumbs {
    display: none;
}

body.tool-page .learn-intro {
    max-width: 720px;
    margin: 0 auto 36px;
    padding: 0 16px;
    text-align: center;
}

.learn-intro .eyebrow {
    display: block;
    margin-bottom: 12px;
    font-family: var(--g-font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--g-gold);
}

body.tool-page .learn-intro .subtitle {
    max-width: 60ch;
    margin: 16px auto 0;
    padding: 0;
    font-size: 1.05rem;
    line-height: 1.65;
    color: var(--g-ink-2);
}

/* Section labels ------------------------------------------------------- */

.la-step {
    display: flex;
    align-items: baseline;
    gap: 12px;
    margin: 40px 0 14px !important;
    padding-top: 14px !important;
    font-family: var(--g-font-sans);
    font-size: 0.78rem !important;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--g-ink-3);
    border-top: 1px solid var(--g-rule) !important;
}

.la-step:first-child {
    margin-top: 0 !important;
}

.la-step-num {
    font-family: var(--g-font-mono);
    color: var(--g-gold);
}

/* Choice tiles (subjects and decks) ------------------------------------ */

.la-tiles {
    display: grid;
    grid-template-columns: repeat(var(--la-cols, 3), minmax(0, 1fr));
    gap: 12px;
}

@media (max-width: 860px) {
    .la-tiles {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 560px) {
    .la-tiles {
        grid-template-columns: minmax(0, 1fr);
    }

    .la-tile {
        min-height: 0;
    }
}

.la-tile-groups {
    display: grid;
    gap: 12px;
}

.la-tiles-heading {
    margin-top: 14px !important;
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--g-ink-3);
}

.la-tile {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 6px;
    min-height: 128px;
    padding: 18px 18px 16px;
    color: var(--g-ink);
    background: var(--g-panel);
    border: 1px solid var(--g-rule);
    cursor: pointer;
    transition: border-color var(--la-ease), background-color var(--la-ease);
}

.la-tile:hover {
    border-color: var(--g-rule-strong);
}

.la-tile input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.la-tile:has(input:checked) {
    background: var(--g-clasp), var(--g-panel);
    border-color: var(--g-gold);
}

.la-tile:has(input:focus-visible) {
    outline: 2px solid var(--g-gold);
    outline-offset: 2px;
}

.la-tile-name {
    font-family: var(--g-font-display);
    font-size: 1.35rem;
    font-weight: 600;
    line-height: 1.15;
    color: var(--g-ink);
}

.la-tile-desc {
    font-size: 0.88rem;
    line-height: 1.5;
    color: var(--g-ink-2);
}

.la-tile-facts {
    display: flex;
    flex-wrap: wrap;
    gap: 4px 14px;
    margin-top: auto;
    padding-top: 8px;
    font-family: var(--g-font-mono);
    font-size: 0.74rem;
    color: var(--g-ink-3);
}

.la-tile-facts .is-strong {
    color: var(--g-gold);
}

.la-tile-meter {
    height: 2px;
    margin-top: 10px;
    background: var(--g-rule);
}

.la-tile-meter span {
    display: block;
    height: 100%;
    background: var(--g-verdigris);
}

/* Setting rows --------------------------------------------------------- */

.la-settings {
    display: grid;
    grid-template-columns: 140px minmax(0, 1fr);
    border-top: 1px solid var(--g-rule);
}

.la-setting-label,
.la-setting-control {
    padding: 14px 0;
    border-bottom: 1px solid var(--g-rule);
}

.la-setting-label {
    padding-right: 16px;
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--g-ink-3);
    line-height: 36px;
}

.la-setting-control {
    min-width: 0;
}

.la-setting-hint {
    margin-top: 8px !important;
    font-size: 0.86rem;
    line-height: 1.5;
    color: var(--g-ink-3);
}

/* Segmented control built from radio inputs. */
.la-segmented {
    display: inline-flex;
    flex-wrap: wrap;
    border: 1px solid var(--g-rule-strong);
}

.la-segmented label {
    position: relative;
    display: inline-flex;
    cursor: pointer;
}

.la-segmented input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.la-segmented span {
    display: inline-flex;
    align-items: center;
    min-height: 36px;
    padding: 0 16px;
    font-size: 0.88rem;
    font-variant-numeric: tabular-nums;
    color: var(--g-ink-2);
    transition: color var(--la-ease), background-color var(--la-ease);
}

.la-segmented label+label span {
    border-left: 1px solid var(--g-rule-strong);
}

.la-segmented label:hover span {
    color: var(--g-gold);
}

.la-segmented input:checked+span {
    color: var(--g-on-gold);
    background: var(--g-gold);
}

.la-segmented input:focus-visible+span {
    outline: 2px solid var(--g-gold);
    outline-offset: 2px;
}

.la-check {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    min-height: 36px;
    font-size: 0.92rem;
    color: var(--g-ink-2);
    cursor: pointer;
}

.la-check input {
    width: 16px;
    height: 16px;
    margin: 0;
    accent-color: var(--g-gold);
}

/* Topic picker --------------------------------------------------------- */

.la-topics summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    min-height: 36px;
    font-size: 0.95rem;
    color: var(--g-ink);
    cursor: pointer;
    list-style: none;
}

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

.la-topics summary::after {
    content: attr(data-change) !important;
    font-size: 0.82rem;
    color: var(--g-gold);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.la-topics[open] summary::after {
    content: attr(data-done) !important;
}

.la-topics[open] {
    padding-bottom: 4px;
}

.la-topic-tools {
    display: flex;
    gap: 16px;
    margin: 12px 0 6px;
}

.la-topic-group {
    margin-top: 14px;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--g-ink-3);
}

.la-topic-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 0 24px;
    margin-top: 4px;
}

.la-topic {
    display: flex;
    align-items: center;
    gap: 10px;
    min-height: 40px;
    font-size: 0.92rem;
    line-height: 1.3;
    color: var(--g-ink);
    border-bottom: 1px solid var(--g-rule);
    cursor: pointer;
}

.la-topic input {
    flex: none;
    width: 16px;
    height: 16px;
    margin: 0;
    accent-color: var(--g-gold);
}

.la-topic-name {
    flex: 1;
    min-width: 0;
}

.la-topic-count {
    font-family: var(--g-font-mono);
    font-size: 0.74rem;
    color: var(--g-ink-3);
}

/* Text buttons and links --------------------------------------------- */

body.tool-page .la-link {
    min-height: 0 !important;
    padding: 0 !important;
    font-size: 0.86rem !important;
    color: var(--g-gold) !important;
    background: none !important;
    border: 0 !important;
    text-decoration: underline;
    text-underline-offset: 3px;
    cursor: pointer;
}

body.tool-page .la-link:hover {
    color: var(--g-ink) !important;
}

.la a {
    color: var(--g-gold);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
}

.la a:hover {
    color: var(--g-ink);
}

body.tool-page .la .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    min-height: var(--la-tap);
    padding: 0 22px !important;
    font-size: 0.92rem !important;
}

body.tool-page .la .btn-quiet {
    border-color: var(--g-rule) !important;
    color: var(--g-ink-2) !important;
}

body.tool-page .la .btn-quiet:hover {
    border-color: var(--g-gold) !important;
    color: var(--g-gold) !important;
}

.la kbd,
.la-kbd {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 20px;
    height: 20px;
    padding: 0 5px;
    font-family: var(--g-font-mono);
    font-size: 0.7rem;
    line-height: 1;
    color: inherit;
    background: transparent;
    border: 1px solid currentColor;
    opacity: 0.7;
}

/* Start bar ------------------------------------------------------------ */

.la-start {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-top: 28px;
    padding: 18px 20px;
    background: var(--g-panel);
    border: 1px solid var(--g-rule);
}

.la-start-summary {
    font-size: 0.95rem;
    line-height: 1.45;
    color: var(--g-ink-2);
}

.la-start-summary strong {
    color: var(--g-ink);
    font-weight: 600;
}

.la-banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 28px;
    padding: 16px 20px;
    background: var(--g-gold-soft);
    border: 1px solid var(--g-gold);
}

.la-banner p {
    font-size: 0.95rem;
    line-height: 1.45;
}

.la-banner-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

/* Session chrome ------------------------------------------------------- */

.la-topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    min-height: 44px;
    padding-bottom: 12px;
}

.la-crumb {
    min-width: 0;
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--g-ink-3);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.la-crumb b {
    font-weight: 600;
    color: var(--g-ink);
}

.la-topbar-meta {
    display: flex;
    flex: none;
    align-items: center;
    gap: 18px;
    font-family: var(--g-font-mono);
    font-size: 0.85rem;
    font-variant-numeric: tabular-nums;
    color: var(--g-ink-2);
}

.la-timer.is-warning {
    color: var(--g-ember);
}

.la-timer.is-critical {
    color: var(--g-rose);
}

/* Progress track: one segment per item, or a plain bar for long sets. */
.la-track {
    display: grid;
    grid-auto-columns: 1fr;
    grid-auto-flow: column;
    gap: 3px;
    height: 6px;
    margin-bottom: 36px;
}

.la-track.is-bar {
    display: block;
    height: 3px;
    background: var(--g-rule);
}

.la-track.is-bar span {
    display: block;
    height: 100%;
    background: var(--g-gold);
    transition: width var(--la-ease);
}

body.tool-page .la-seg {
    min-height: 0 !important;
    height: 6px;
    padding: 0 !important;
    background: var(--g-rule) !important;
    border: 0 !important;
    cursor: default;
}

body.tool-page .la-seg.is-clickable {
    cursor: pointer;
}

body.tool-page .la-seg.is-clickable:hover {
    background: var(--g-rule-strong) !important;
}

body.tool-page .la-seg.is-answered {
    background: var(--g-ink-3) !important;
}

body.tool-page .la-seg.is-correct {
    background: var(--g-verdigris) !important;
}

body.tool-page .la-seg.is-wrong {
    background: var(--g-rose) !important;
}

body.tool-page .la-seg.is-flagged {
    background: var(--g-ember) !important;
}

body.tool-page .la-seg.is-current {
    background: var(--g-gold) !important;
    outline: 1px solid var(--g-gold);
    outline-offset: 2px;
}

/* Readable content ----------------------------------------------------- */

.la-prose {
    max-width: var(--la-measure);
    font-size: 1.06rem;
    line-height: 1.7;
    color: var(--g-ink-2);
    overflow-wrap: break-word;
}

.la-prose> :where(* + *) {
    margin-top: 0.8em !important;
}

.la-prose strong {
    font-weight: 600;
    color: var(--g-ink);
}

.la-prose :where(ul, ol) {
    padding-left: 1.4em !important;
}

.la-prose ul {
    list-style: disc;
}

.la-prose ol {
    list-style: decimal;
}

.la-prose li {
    display: list-item;
    margin: 0.3em 0 !important;
    padding-left: 0.2em !important;
}

.la-prose li::marker {
    color: var(--g-ink-3);
}

.la-prose code {
    font-family: var(--g-font-mono);
    font-size: 0.88em;
}

.la-prose :not(pre)>code,
.la-option-text :not(pre)>code,
.la-question-text :not(pre)>code {
    padding: 0.08em 0.36em;
    color: var(--g-ink);
    background: var(--g-panel-2);
    border: 1px solid var(--g-rule);
    overflow-wrap: anywhere;
}

.la-prose pre,
.la-question-text pre {
    max-width: 100%;
    margin: 1em 0 !important;
    padding: 16px 18px;
    overflow-x: auto;
    font-family: var(--g-font-mono);
    font-size: 0.9rem;
    line-height: 1.55;
    color: var(--g-ink);
    background: var(--g-panel-2);
    border: 1px solid var(--g-rule);
    border-left: 2px solid var(--g-rule-strong);
    tab-size: 4;
}

.la-prose pre code,
.la-question-text pre code {
    padding: 0;
    font-size: inherit;
    background: none;
    border: 0;
}

.la-prose table {
    width: 100%;
    margin: 1em 0 !important;
    border-collapse: collapse;
    font-size: 0.92rem;
}

.la-prose th,
.la-prose td {
    padding: 8px 10px;
    text-align: left;
    border-bottom: 1px solid var(--g-rule);
}

.la-prose th {
    font-weight: 600;
    color: var(--g-ink);
    border-bottom-color: var(--g-rule-strong);
}

.la-prose img {
    max-width: 100%;
    height: auto;
    border: 1px solid var(--g-rule);
}

.la mjx-container {
    max-width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
}

.la mjx-container[display="true"] {
    margin: 1em 0 !important;
}

/* Bottom action bar ---------------------------------------------------- */

.la-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 32px;
    padding-top: 20px;
    border-top: 1px solid var(--g-rule);
}

.la-actions-spacer {
    flex: 1;
}

.la-keys {
    margin-top: 14px !important;
    font-size: 0.8rem;
    color: var(--g-ink-3);
    display: flex;
    flex-wrap: wrap;
    gap: 6px 18px;
}

.la-keys span {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

/* Results -------------------------------------------------------------- */

.la-hero {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    align-items: center;
    gap: 32px;
    padding: 28px;
    background: var(--g-clasp), var(--g-panel);
    border: 1px solid var(--g-rule);
}

.la-score {
    font-family: var(--g-font-sans);
    letter-spacing: -0.03em;
    font-size: clamp(3.4rem, 9vw, 5rem);
    font-weight: 600;
    line-height: 0.9;
    font-variant-numeric: tabular-nums;
    color: var(--g-ink);
}

.la-score small {
    font-size: 0.42em;
    color: var(--g-ink-3);
}

.la-hero-title {
    font-family: var(--g-font-display);
    font-size: 1.6rem !important;
    font-weight: 600;
    line-height: 1.2;
    color: var(--g-ink);
}

.la-hero-text {
    margin-top: 6px !important;
    font-size: 0.98rem;
    line-height: 1.55;
    color: var(--g-ink-2);
}

.la-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 6px 22px;
    margin-top: 14px !important;
    font-family: var(--g-font-mono);
    font-size: 0.82rem;
    color: var(--g-ink-3);
}

.la-stats .is-good {
    color: var(--g-verdigris);
}

.la-stats .is-bad {
    color: var(--g-rose);
}

.la-stats .is-warn {
    color: var(--g-ember);
}

.la-bars {
    display: grid;
    gap: 2px;
}

.la-bar-row {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr) 64px;
    align-items: center;
    gap: 16px;
    min-height: 44px;
    border-bottom: 1px solid var(--g-rule);
    font-size: 0.92rem;
}

.la-bar-name {
    min-width: 0;
    color: var(--g-ink);
}

.la-bar-name a {
    display: block;
    margin-top: 2px;
    font-size: 0.8rem;
}

.la-bar {
    height: 4px;
    background: var(--g-rule);
}

.la-bar span {
    display: block;
    height: 100%;
    background: var(--g-verdigris);
}

.la-bar.is-low span {
    background: var(--g-rose);
}

.la-bar.is-mid span {
    background: var(--g-ember);
}

.la-bar-value {
    font-family: var(--g-font-mono);
    font-size: 0.82rem;
    text-align: right;
    color: var(--g-ink-2);
}

.la-result-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 24px;
}

/* Filter tabs above lists */
.la-tabs {
    display: flex;
    gap: 22px;
    margin-bottom: 4px;
    border-bottom: 1px solid var(--g-rule);
}

body.tool-page .la-tab {
    min-height: 40px !important;
    padding: 0 !important;
    font-size: 0.88rem !important;
    color: var(--g-ink-3) !important;
    background: none !important;
    border: 0 !important;
    border-bottom: 2px solid transparent !important;
    margin-bottom: -1px;
}

body.tool-page .la-tab:hover {
    color: var(--g-ink) !important;
}

body.tool-page .la-tab[aria-selected="true"] {
    color: var(--g-ink) !important;
    border-bottom-color: var(--g-gold) !important;
}

/* Expandable rows (review list, card browser) ------------------------- */

.la-rows>li {
    border-bottom: 1px solid var(--g-rule);
}

.la-row summary {
    display: grid;
    grid-template-columns: 28px minmax(0, 1fr) auto;
    align-items: start;
    gap: 12px;
    padding: 14px 0;
    cursor: pointer;
    list-style: none;
}

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

.la-row summary:hover .la-row-title {
    color: var(--g-gold);
}

.la-row-index {
    padding-top: 2px;
    font-family: var(--g-font-mono);
    font-size: 0.78rem;
    color: var(--g-ink-3);
}

.la-row-title {
    font-size: 0.98rem;
    line-height: 1.5;
    color: var(--g-ink);
    transition: color var(--la-ease);
}

.la-row-tag {
    padding-top: 3px;
    font-family: var(--g-font-mono);
    font-size: 0.72rem;
    white-space: nowrap;
    color: var(--g-ink-3);
}

.la-row-tag.is-good {
    color: var(--g-verdigris);
}

.la-row-tag.is-bad {
    color: var(--g-rose);
}

.la-row-tag.is-warn {
    color: var(--g-ember);
}

.la-row-body {
    padding: 0 0 20px 40px;
}

.la-search {
    display: flex;
    gap: 12px;
    align-items: center;
    margin-bottom: 16px;
}

body.tool-page .la-search input {
    flex: 1;
    min-width: 0;
    min-height: 44px;
    padding: 0 14px;
    font-size: 1rem;
}

.la-count {
    font-family: var(--g-font-mono);
    font-size: 0.8rem;
    color: var(--g-ink-3);
    white-space: nowrap;
}

.la-empty {
    padding: 56px 24px;
    text-align: center !important;
    font-size: 1rem;
    line-height: 1.6;
    color: var(--g-ink-2);
    border: 1px dashed var(--g-rule);
}

.la-reveal {
    animation: la-fade 160ms ease;
}

@keyframes la-fade {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

/* Small screens: actions stay within thumb reach. ----------------------- */

@media (max-width: 640px) {
    .la {
        margin-bottom: 120px;
    }

    .la-settings {
        grid-template-columns: minmax(0, 1fr);
    }

    .la-setting-label {
        padding-bottom: 0;
        border-bottom: 0;
        line-height: 1.4;
    }

    .la-start,
    .la-banner {
        flex-direction: column;
        align-items: stretch;
    }

    .la-actions {
        position: sticky;
        bottom: 0;
        z-index: 5;
        margin: 24px -16px 0;
        padding: 12px 16px calc(12px + env(safe-area-inset-bottom));
        background: var(--g-bg);
    }

    body.tool-page .la-actions .btn {
        flex: 1 1 0;
        padding: 0 10px !important;
        font-size: 0.86rem !important;
        white-space: nowrap;
    }

    body.tool-page .la-actions .btn.primary {
        flex-grow: 1.8;
    }

    .la-actions-spacer,
    .la-keys {
        display: none !important;
    }

    .la-hero {
        grid-template-columns: minmax(0, 1fr);
        gap: 16px;
        padding: 22px;
    }

    .la-bar-row {
        grid-template-columns: minmax(0, 1fr) 56px;
    }

    .la-bar {
        grid-column: 1 / -1;
        grid-row: 2;
        margin-bottom: 10px;
    }

    .la-row-body {
        padding-left: 0;
    }

    .la-topbar-meta {
        gap: 12px;
    }
}

@media (prefers-reduced-motion: reduce) {

    .la *,
    .la-reveal {
        animation: none !important;
        transition: none !important;
    }
}

/* Headings receive focus only so screen readers announce a new screen. */
.la-hero-title:focus {
    outline: none;
}

/* Syntax highlighting: Prism tokens take the tool palette in both themes. */
.la {
    --syntax-text: var(--g-ink);
    --syntax-comment: var(--g-ink-3);
    --syntax-punctuation: var(--g-ink-2);
    --syntax-keyword: var(--g-gold);
    --syntax-string: var(--g-verdigris);
    --syntax-number: var(--g-moon);
    --syntax-function: var(--g-ink);
    --syntax-attribute: var(--g-ember);
}

.la .token.comment,
.la .token.prolog {
    font-style: italic;
}

.la .token.function,
.la .token.class-name {
    font-weight: 600;
}

.la code[class*="language-"],
.la pre[class*="language-"] {
    color: var(--syntax-text);
    font-family: var(--g-font-mono);
}