/* LT5461 in-class experiments — shared styles.
   Inherits the academic site's tokens (design-system.md): ink on white,
   whisper-blue bands, one mint highlight, Open Sans throughout.
   The task stage itself is deliberately plain: black stimuli on white, as in
   the lab versions of these paradigms. */

@font-face {
    font-family: 'Open Sans';
    font-style: normal;
    font-weight: 300 800;
    font-display: swap;
    src: url('fonts/OpenSans-var.woff2') format('woff2');
}

@font-face {
    font-family: 'Open Sans Fallback';
    src: local('Arial');
    size-adjust: 104.63%;
    ascent-override: 101.32%;
    descent-override: 27.78%;
    line-gap-override: 0%;
}

:root {
    --bg: #ffffff;
    --bg-alt: #f3f7fb;
    --highlight: #dcead0;
    --mint-deep: #4f7a3a;       /* mint family, dark enough for 3:1 marks on white */
    --text: #111111;
    --text-body: #222222;
    --text-secondary: #3a3f45;
    --text-light: #55595f;
    --navy-deep: #031d44;
    --border: #dfe5ea;
    --border-strong: #c9d2da;
    --border-input: #7d858d;    /* text fields: 3.7:1 on white (WCAG 1.4.11) */
    --danger: #a1260d;

    --font: 'Open Sans', 'Open Sans Fallback', -apple-system, sans-serif;
    /* Stimulus faces: Arial for Latin, as in the lab versions (44-pt Arial);
       system CJK faces for the primes — no web font can load mid-trial. */
    --font-stim: Arial, 'Helvetica Neue', Helvetica, sans-serif;
    --font-hans: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans CJK SC', 'Source Han Sans SC', sans-serif;
    --font-hant: 'PingFang TC', 'PingFang HK', 'Microsoft JhengHei', 'Noto Sans CJK TC', 'Source Han Sans TC', sans-serif;

    --measure: 38rem;
    --wide: 60rem;
    --ease: cubic-bezier(0.22, 1, 0.36, 1);
    --hl-drop: 0.2em;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 106.25%; -webkit-text-size-adjust: 100%; }

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text-body);
    line-height: 1.62;
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
}

[hidden] { display: none !important; }

a {
    color: var(--text);
    text-decoration: none;
    background-image: linear-gradient(0deg, var(--highlight), var(--highlight));
    background-repeat: no-repeat;
    background-position: 0 100%;
    background-size: 100% 0.2em;
    padding-bottom: var(--hl-drop);
    transition: background-size 0.45s var(--ease);
}
a:hover { background-size: 100% 100%; }

:focus-visible { outline: 2px solid var(--text); outline-offset: 3px; }
/* Headings receive focus programmatically when a screen changes (for screen
   readers); they are not controls, so no ring. */
[tabindex="-1"]:focus { outline: none; }

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

.skip-link {
    position: absolute; left: 1rem; top: -3rem;
    background: var(--text); color: #fff; padding: 0.5rem 0.9rem; z-index: 10;
    background-image: none;
}
.skip-link:focus { top: 0.75rem; }

/* ---------- Masthead ---------- */
.masthead {
    border-bottom: 1px solid var(--border);
    background: var(--bg);
}
.masthead-inner {
    max-width: var(--wide);
    margin: 0 auto;
    padding: 0.9rem 1.5rem;
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}
.brand {
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.01em;
    font-size: 1rem;
    background-size: 100% 0;
    padding-bottom: 0;
}
.brand span { font-weight: 400; color: var(--text-light); }
@media (max-width: 480px) { .brand span { display: none; } .masthead-inner { padding-top: 0.7rem; padding-bottom: 0.7rem; } }
.masthead-meta { font-size: 0.82rem; color: var(--text-light); }

main { flex: 1; width: 100%; }

.page {
    max-width: var(--wide);
    margin: 0 auto;
    padding: clamp(2rem, 6vw, 4rem) 1.5rem 4rem;
}

.column { max-width: var(--measure); }

/* ---------- Type ---------- */
.eyebrow {
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-light);
    margin-bottom: 0.9rem;
}

h1 {
    font-weight: 700;
    font-size: clamp(1.9rem, 5vw, 2.6rem);
    line-height: 1.12;
    letter-spacing: -0.02em;
    color: var(--text);
    margin-bottom: 1.1rem;
    text-wrap: balance;
}

h2 {
    font-weight: 700;
    font-size: 1.35rem;
    line-height: 1.2;
    letter-spacing: -0.01em;
    color: var(--text);
    margin: 2.5rem 0 0.9rem;
}
h2::before {
    content: '';
    display: block;
    width: 2.75rem;
    height: 3px;
    background: var(--text);
    margin-bottom: 0.9rem;
}
h2.plain::before { display: none; }

h3 {
    font-weight: 650;
    font-size: 1.2rem;
    color: var(--text);
    margin: 1.6rem 0 0.5rem;
}

p + p { margin-top: 0.85rem; }
.lead { font-size: 1.12rem; color: var(--text-secondary); }
.muted { color: var(--text-light); }
.small { font-size: 0.86rem; }
strong { font-weight: 650; color: var(--text); }

/* ---------- Procedure list ---------- */
.steps {
    list-style: none;
    counter-reset: step;
    margin: 1.6rem 0;
    border-top: 1px solid var(--border);
}
.steps li {
    counter-increment: step;
    display: grid;
    grid-template-columns: 2.2rem 1fr;
    gap: 0.75rem;
    padding: 0.8rem 0;
    border-bottom: 1px solid var(--border);
}
.steps li::before {
    content: counter(step, decimal-leading-zero);
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--text);
    padding-top: 0.12rem;
    font-variant-numeric: tabular-nums;
}

/* ---------- Keycaps ---------- */
kbd {
    display: inline-grid;
    place-items: center;
    min-width: 2.1em;
    height: 2.1em;
    padding: 0 0.45em;
    font: 700 0.95em/1 var(--font);
    color: var(--text);
    background: #fff;
    border: 1px solid var(--text);
    border-bottom-width: 3px;
    border-radius: 6px;
    vertical-align: middle;
}

.keymap {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1px;
    background: var(--border);
    border: 1px solid var(--border);
    margin: 1.4rem 0;
}
.keymap > div {
    background: var(--bg);
    padding: 1.1rem 1rem;
    display: flex;
    align-items: center;
    gap: 0.9rem;
}
.keymap kbd { font-size: 1.25rem; }
.keymap .side { font-size: 0.78rem; color: var(--text-light); display: block; }
.keymap b { display: block; color: var(--text); font-weight: 650; }
@media (max-width: 480px) {
    .keymap > div { flex-direction: column; align-items: flex-start; gap: 0.6rem; }
}

/* ---------- Choice groups (real radios, styled rows) ---------- */
fieldset { border: 0; margin: 1.6rem 0 0; min-width: 0; }
legend { font-weight: 650; color: var(--text); margin-bottom: 0.6rem; font-size: 1rem; }
.hint { font-size: 0.86rem; color: var(--text-light); margin: -0.35rem 0 0.7rem; }

.choices { display: grid; gap: 0.5rem; }
.choices.cols-2 { grid-template-columns: repeat(auto-fill, minmax(14.5rem, 1fr)); }
.choices.cols-7 { grid-template-columns: repeat(7, minmax(0, 1fr)); }
@media (max-width: 480px) { .choices.cols-7, .choices.cols-9 { gap: 0.3rem; } }

.choice { position: relative; display: block; }
.choice input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; }
.choice > span {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    min-height: 3rem;
    padding: 0.65rem 0.95rem;
    border: 1px solid var(--border-strong);
    border-radius: 4px;
    color: var(--text-body);
    background: var(--bg);
    transition: background-color 0.2s var(--ease), border-color 0.2s var(--ease);
    cursor: pointer;
}
.choice > span::before {
    content: '';
    flex: none;
    width: 1rem; height: 1rem;
    border-radius: 50%;
    border: 1.5px solid var(--text-secondary);
    background: #fff;
    box-shadow: inset 0 0 0 3px #fff;
}
.choices.cols-7 .choice > span { justify-content: center; padding: 0.6rem 0; font-weight: 650; }
.choices.cols-7 .choice > span::before { display: none; }
.choice input:hover + span { border-color: var(--text); }
.choice input:checked + span {
    background: var(--highlight);
    border-color: var(--text);
    color: var(--text);
}
.choice input:checked + span::before { background: var(--text); border-color: var(--text); }
.choice input:focus-visible + span { outline: 2px solid var(--text); outline-offset: 2px; }
.scale-ends { display: flex; justify-content: space-between; font-size: 0.8rem; color: var(--text-light); margin-top: 0.35rem; }

/* ---------- Buttons ---------- */
.actions { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem 1.4rem; margin-top: 2rem; }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    min-height: 3rem;
    padding: 0.75rem 1.5rem;
    font: 600 1rem/1.2 var(--font);
    color: #fff;
    background: var(--text);
    border: 1px solid var(--text);
    border-radius: 3px;
    cursor: pointer;
    background-image: none;
    transition: background-color 0.2s var(--ease), transform 0.2s var(--ease);
}
.btn:hover { background: #2a2d33; }
.btn:active { transform: translateY(1px); }
.btn:disabled { background: var(--border-strong); border-color: var(--border-strong); color: var(--text-secondary); cursor: not-allowed; }
.btn .arrow { transition: transform 0.35s var(--ease); }
.btn:hover .arrow { transform: translateX(3px); }

.btn-quiet {
    font: 600 0.95rem/1.2 var(--font);
    color: var(--text);
    background: none;
    border: 0;
    padding: 0.35rem 0;
    min-height: 2.5rem;
    cursor: pointer;
    /* mint fill on hover (the site's one highlight) over a darker resting rule
       that stays visible as a control (3:1 on white) */
    background-image: linear-gradient(var(--highlight), var(--highlight)), linear-gradient(var(--mint-deep), var(--mint-deep));
    background-repeat: no-repeat;
    background-position: 0 85%, 0 88%;
    background-size: 100% 0, 100% 2px;
    transition: background-size 0.45s var(--ease);
}
.btn-quiet:hover { background-size: 100% 70%, 100% 2px; }

.key-hint { font-size: 0.86rem; color: var(--text-light); }
.stage-panel .key-hint { margin-top: 0.6rem; }
.touch .stage-panel .key-hint, .touch .keys-only { display: none; }
.form-error { color: var(--danger); font-weight: 600; font-size: 0.92rem; margin-top: 1.25rem; min-height: 1.4em; }
.form-error:empty { display: none; }
.choices.cols-2 .choice:last-child:nth-child(odd) { grid-column: 1 / -1; }

/* ---------- Notices ---------- */
.note {
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-left: 3px solid var(--text);
    padding: 0.9rem 1.1rem;
    font-size: 0.92rem;
    color: var(--text-secondary);
    margin: 1.5rem 0;
}
.note.warn { border-left-color: var(--danger); }

/* ---------- Task stage ---------- */
.stage {
    position: fixed;
    inset: 0;
    background: #fff;
    z-index: 50;
    display: grid;
    grid-template-rows: auto 1fr auto;
    cursor: none;
    user-select: none;
    -webkit-user-select: none;
    touch-action: manipulation;
}
.stage.pointer { cursor: default; }
/* Progress bar: updated only between trials, never during one. */
.progress { width: min(36rem, calc(100% - 3rem)); margin: 1.5rem auto 0; font-family: var(--font); }
.progress-inline { width: 100%; max-width: 42rem; margin: 0 auto; }
.progress-meta {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-light);
    margin-bottom: 0.45rem;
    font-variant-numeric: tabular-nums;
}
.progress-track {
    height: 8px;
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: 999px;
    overflow: hidden;
}
.progress-track i {
    display: block;
    height: 100%;
    width: 0;
    background: var(--text);
    border-radius: inherit;
    transition: width 0.3s var(--ease);
}
.stage-center { display: grid; place-items: center; position: relative; min-height: 0; }

/* All stimulus layers occupy one grid cell; switching is visibility-only so a
   frame change never triggers layout. */
.stim-box {
    display: grid;
    place-items: center;
    width: 100%;
    height: 9rem;
    font-size: min(56px, 11vw);
}
.stim-box > span {
    grid-area: 1 / 1;
    visibility: hidden;
    font-family: var(--font-stim);
    color: #000;
    line-height: 1;
    white-space: nowrap;
}
.stim-box > span.on { visibility: visible; }
.stim-box .l-target { letter-spacing: 0.02em; }
/* Hash marks are cap-height; a CJK glyph fills most of the em box. Enlarge the
   mask so it covers the prime's footprint in both dimensions. */
.stim-box .l-mask { font-size: 1.25em; letter-spacing: -0.02em; }
.stim-box .l-fix { font-size: 1.1em; }
.stim-box .l-prime:lang(zh-Hans) { font-family: var(--font-hans); }
.stim-box .l-prime:lang(zh-Hant) { font-family: var(--font-hant); }

.stage-msg {
    position: absolute;
    left: 1.5rem; right: 1.5rem;
    top: calc(50% + 5.5rem);
    text-align: center;
    font-family: var(--font);
    font-size: 1rem;
    color: var(--text-secondary);
    min-height: 1.6em;
}
.stage-msg.bad { color: var(--danger); }
.stage-msg.good { color: var(--text); }

.stage-panel {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    padding: 1.5rem;
    text-align: center;
    background: #fff;
    cursor: default;
}
.stage-panel .column { margin: 0 auto; }
.stage-panel h2 { margin-top: 0; }
.stage-panel h2::before { margin-left: auto; margin-right: auto; }

/* Touch response pads: only on coarse pointers */
.pads {
    display: none;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    padding: 0.75rem max(0.75rem, env(safe-area-inset-left)) max(0.75rem, env(safe-area-inset-bottom));
}
.touch .pads { display: grid; }
.pad {
    min-height: 5.5rem;
    font: 650 1.05rem/1.2 var(--font);
    color: var(--text);
    background: var(--bg-alt);
    border: 1px solid var(--border-strong);
    border-radius: 6px;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}
.pad:active { background: var(--highlight); }

/* ---------- Results ---------- */
.result-head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 0.5rem 1.5rem; }
.code-chip {
    font-size: 0.86rem;
    color: var(--text-secondary);
}
.code-chip b { font-family: ui-monospace, 'SF Mono', Menlo, monospace; font-weight: 600; letter-spacing: 0.04em; background: var(--highlight); padding: 0.1rem 0.4rem; color: var(--text); }

.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(10.5rem, 1fr));
    border-top: 3px solid var(--text);
    margin: 1.8rem 0 0.5rem;
}
.stat { padding: 1rem 1.25rem 1.1rem 0; border-bottom: 1px solid var(--border); }
.stat + .stat { padding-left: 1.25rem; border-left: 1px solid var(--border); }
.stat-label { font-size: 0.82rem; color: var(--text-light); display: block; }
.stat-value {
    display: block;
    font-weight: 700;
    font-size: clamp(1.8rem, 4vw, 2.4rem);
    line-height: 1.1;
    letter-spacing: -0.02em;
    color: var(--text);
    font-variant-numeric: tabular-nums;
    margin-top: 0.3rem;
}
.stat-value small { font-size: 0.5em; font-weight: 600; color: var(--text-secondary); letter-spacing: 0; margin-left: 0.15em; }
.stat-note { font-size: 0.82rem; color: var(--text-secondary); display: block; margin-top: 0.2rem; }
.stat.key .stat-value { background: linear-gradient(0deg, var(--highlight) 0 0.32em, transparent 0.32em); display: inline-block; }

@media (max-width: 560px) {
    .stat + .stat { padding-left: 0; border-left: 0; }
}

.figure { margin: 1.25rem 0 0.5rem; }
.figure figcaption { font-size: 0.86rem; color: var(--text-light); margin-top: 0.5rem; max-width: var(--measure); }
.chart { width: 100%; height: auto; display: block; overflow: visible; font-family: var(--font); }
.chart text { fill: var(--text-secondary); font-size: 12px; }
.chart .axis line, .chart .axis path { stroke: var(--border-strong); }
.chart .zero { stroke: var(--text); stroke-width: 1; }
.chart .grid { stroke: var(--border); }
.chart .dot { fill: #fff; stroke: var(--text-secondary); stroke-width: 1.25; }
.chart .dot.excluded { stroke: var(--border-strong); stroke-dasharray: 2 2; }
.chart .you { fill: var(--highlight); stroke: var(--text); stroke-width: 2.25; }
.chart .you-label { fill: var(--text); font-weight: 700; font-size: 12px; }
.chart .mean { stroke: var(--text); stroke-width: 3; }
.chart .ci { fill: var(--highlight); opacity: 0.85; }
.chart .mean-label { fill: var(--text); font-weight: 700; font-size: 12.5px; }
.chart .series-a { stroke: var(--text); fill: var(--text); }
.chart .series-b { stroke: var(--text-light); fill: #fff; }
.chart .line-a { stroke: var(--text); stroke-width: 2.25; fill: none; }
.chart .line-b { stroke: var(--text-light); stroke-width: 2.25; fill: none; stroke-dasharray: 5 4; }
.chart .whisker { stroke-width: 1.5; }
.chart .chance { stroke: var(--text-light); stroke-dasharray: 3 4; }
.chart .label-strong { fill: var(--text); font-weight: 650; font-size: 13px; }

.legend { display: flex; flex-wrap: wrap; gap: 0.4rem 1.4rem; font-size: 0.86rem; color: var(--text-secondary); margin-top: 0.4rem; }
.legend i { display: inline-block; vertical-align: middle; margin-right: 0.45rem; }
.legend .sw-a { width: 1.4rem; height: 0; border-top: 2.25px solid var(--text); }
.legend .sw-b { width: 1.4rem; height: 0; border-top: 2.25px dashed var(--text-light); }
.legend .sw-you { width: 0.8rem; height: 0.8rem; border-radius: 50%; background: var(--highlight); border: 2px solid var(--text); }
.legend .sw-dot { width: 0.7rem; height: 0.7rem; border-radius: 50%; border: 1.25px solid var(--text-secondary); }
.legend .sw-mean { width: 3px; height: 0.9rem; background: var(--text); }

/* Signature moment: the class arrives one dot at a time; yours lands last. */
@media (prefers-reduced-motion: no-preference) {
    .chart .dot, .chart .you {
        animation: dot-in 0.7s var(--ease) both;
        animation-delay: calc(var(--i, 0) * 28ms);
    }
    .chart .you { animation-name: you-in; animation-duration: 0.9s; }
    @keyframes dot-in { from { opacity: 0; transform: translateY(-14px); } }
    @keyframes you-in { 0% { opacity: 0; transform: scale(0.2); } 60% { transform: scale(1.35); } }
    .chart .dot, .chart .you { transform-box: fill-box; transform-origin: center; }
}

.table-wrap { overflow-x: auto; margin: 1rem 0; }
table.data { border-collapse: collapse; width: 100%; font-size: 0.92rem; font-variant-numeric: tabular-nums; }
table.data th, table.data td { text-align: left; padding: 0.55rem 0.9rem 0.55rem 0; border-bottom: 1px solid var(--border); white-space: nowrap; }
table.data th { font-weight: 650; color: var(--text); border-bottom: 1px solid var(--text); font-size: 0.84rem; }
table.data tbody th { border-bottom-color: var(--border); font-size: 0.92rem; }
table.data td.num, table.data th.num { text-align: right; }

.band {
    background: var(--bg-alt);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}
.band .page { padding-top: 2.5rem; padding-bottom: 2.75rem; }

.refs { list-style: none; font-size: 0.88rem; color: var(--text-secondary); }
.refs li { padding-left: 1.5rem; text-indent: -1.5rem; margin-bottom: 0.5rem; }

.status-line { font-size: 0.86rem; color: var(--text-light); display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; }
.live-dot { width: 0.55rem; height: 0.55rem; border-radius: 50%; background: var(--mint-deep); flex: none; }
.live-dot.off { background: var(--border-strong); }
@media (prefers-reduced-motion: no-preference) {
    .live-dot:not(.off) { animation: pulse 2s ease-in-out infinite; }
    @keyframes pulse { 50% { box-shadow: 0 0 0 5px rgba(79, 122, 58, 0.18); } }
}

.footer {
    border-top: 1px solid var(--border);
    font-size: 0.82rem;
    color: var(--text-light);
}
.footer .page { padding-top: 1.25rem; padding-bottom: 1.5rem; }

@media (prefers-reduced-motion: reduce) {
    a, .btn, .btn .arrow, .btn-quiet, .choice > span, .shape-btn, .bar-fill, .progress-track i { transition: none; }
}

@media print {
    .masthead, .actions, .footer { display: none; }
}

/* ---------- Shape task ---------- */
.task-wrap {
    max-width: 50rem;
    margin: 0 auto;
    padding: clamp(1.25rem, 4vw, 2.5rem) 1.5rem 2rem;
    display: grid;
    gap: 1.25rem;
}
.task-q { text-align: center; font-size: 1.1rem; color: var(--text-secondary); }
.task-word {
    display: block;
    font-family: var(--font-stim);
    font-size: clamp(2.6rem, 9vw, 4rem);
    line-height: 1.15;
    color: #000;
    letter-spacing: 0.03em;
    margin: 0.2rem 0 0.75rem;
}
.shape-pair {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: clamp(0.75rem, 5vw, 3.5rem);
    max-width: 42rem;
    width: 100%;
    margin: 0.75rem auto 0;
}
.shape-btn {
    aspect-ratio: 1;
    width: 100%;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 9%;
    cursor: pointer;
    transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease);
    -webkit-tap-highlight-color: transparent;
}
.shape-btn svg { width: 100%; height: 100%; display: block; overflow: visible; }
.shape-btn path { fill: #111; }
.shape-btn:hover { border-color: var(--text); }
.shape-btn.picked { background: var(--highlight); border-color: var(--text); }
.shape-keys { display: flex; justify-content: space-between; max-width: 42rem; width: 100%; margin: 0 auto; }
.t-stage.blank .task-word, .t-stage.blank .shape-btn svg { visibility: hidden; }
@media (hover: none) { .shape-keys { display: none; } }

.pair-demo { display: flex; gap: 1rem; margin: 1.5rem 0; }
.pair-demo svg { width: 5.5rem; height: 5.5rem; }
.pair-demo path { fill: #111; }

.multiples { display: grid; grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr)); gap: 1.5rem 3rem; margin-top: 1rem; }
.multiples h3 { margin-top: 0; }
.multiples .figure { max-width: 34rem; }

/* Results: the button row follows the results directly. */
#s-results .page + .page { padding-top: 0; }

/* Self-rated proficiency: skill label + a 1–7 row per skill */
.prof-ends {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--text-light);
    margin: 0 0 0.4rem 7rem;
}
.prof-row {
    display: grid;
    grid-template-columns: 7rem minmax(0, 1fr);
    align-items: center;
    gap: 0.5rem;
    padding: 0.3rem 0;
}
.prof-skill { font-weight: 600; color: var(--text); font-size: 0.95rem; }
.prof .choices.cols-7 .choice > span { min-height: 2.6rem; }
@media (max-width: 480px) {
    .prof-ends { margin-left: 0; }
    .prof-row { grid-template-columns: 1fr; gap: 0.3rem; padding: 0.5rem 0; }
}

/* Chinese pages: Latin in Open Sans, Han characters in the system CJK face */
html:lang(zh-Hans) body { font-family: 'Open Sans', var(--font-hans), sans-serif; }
html:lang(zh-Hans) .lead, html:lang(zh-Hans) .item-text { line-height: 1.75; }

/* Judgement task: one question per screen */
.item-wrap {
    max-width: 44rem;
    margin: 0 auto;
    padding: clamp(1.25rem, 4vw, 2.5rem) 1.5rem 3rem;
    display: grid;
    gap: 1.75rem;
}
.item-text { font-size: clamp(1.1rem, 2.6vw, 1.35rem); line-height: 1.55; color: var(--text); font-weight: 500; }
.resp-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; }
.resp-scale { display: grid; grid-template-columns: repeat(var(--n), minmax(0, 1fr)); gap: 0.4rem; }
.resp-btn {
    min-height: 3.25rem;
    font: 650 1.05rem/1.2 var(--font);
    color: var(--text);
    background: #fff;
    border: 1px solid var(--border-strong);
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.15s var(--ease), border-color 0.15s var(--ease);
    -webkit-tap-highlight-color: transparent;
}
.resp-pair .resp-btn { min-height: 3.75rem; font-size: 1.1rem; }
.resp-btn:hover { border-color: var(--text); }
.resp-btn.picked { background: var(--highlight); border-color: var(--text); }
.resp + .scale-ends, .resp .scale-ends { margin-top: 0.5rem; }
.choices.cols-9 { grid-template-columns: repeat(9, minmax(0, 1fr)); }
@media (max-width: 480px) { .resp-scale { gap: 0.25rem; } .resp-btn { font-size: 0.95rem; } }

.chart .ref-label { fill: var(--text-secondary); font-size: 11.5px; paint-order: stroke; stroke: #fff; stroke-width: 4px; stroke-linejoin: round; }

/* ---------- Association task ---------- */
.choices.cols-11 { grid-template-columns: repeat(11, minmax(0, 1fr)); gap: 0.3rem; }
.choices.cols-11 .choice > span { justify-content: center; padding: 0.55rem 0; min-height: 2.6rem; font-weight: 650; font-variant-numeric: tabular-nums; }
.choices.cols-11 .choice > span::before { display: none; }
@media (max-width: 480px) { .choices.cols-11 { gap: 0.2rem; } .choices.cols-11 .choice > span { font-size: 0.86rem; } }
.prof-11 + .prof-11 { margin-top: 2.25rem; }
.prof-11 legend { font-size: 1.1rem; }

.text-input, .assoc-input {
    font: 500 1rem var(--font);
    color: var(--text);
    background: #fff;
    border: 1px solid var(--border-input);
    border-radius: 4px;
    padding: 0.6rem 0.8rem;
    min-height: 3rem;
}
.text-input:hover, .assoc-input:hover { border-color: var(--text); }
.text-input:focus-visible, .assoc-input:focus-visible { outline: 2px solid var(--text); outline-offset: 2px; border-color: var(--text); }
.num-field { display: flex; align-items: center; gap: 0.75rem; color: var(--text-secondary); }
.num-field .text-input { width: 6.5rem; font-variant-numeric: tabular-nums; }

.assoc-wrap {
    max-width: 42rem;
    margin: 0 auto;
    padding: clamp(1.25rem, 4vw, 2.5rem) 1.5rem 3rem;
    display: grid;
    gap: 1.5rem;
}
.assoc-cue-area { text-align: center; padding: clamp(1rem, 5vh, 3rem) 0 0.5rem; }
.assoc-tag { font-size: 0.86rem; font-weight: 600; letter-spacing: 0.02em; color: var(--mint-deep); min-height: 1.4em; }
.assoc-cue {
    font-family: var(--font-stim);
    font-size: clamp(2.3rem, 8vw, 3.6rem);
    line-height: 1.2;
    color: #000;
    margin: 0.35rem 0 1.25rem;
    overflow-wrap: anywhere;
}
.assoc-cue:lang(zh-Hant) { font-family: var(--font-hant); letter-spacing: 0.04em; }
.assoc-cue:lang(zh-Hans) { font-family: var(--font-hans); letter-spacing: 0.04em; }
.assoc-steps { list-style: none; display: flex; justify-content: center; gap: 0.45rem; }
.assoc-steps li { width: 0.6rem; height: 0.6rem; border-radius: 50%; border: 1.5px solid var(--border-strong); }
.assoc-steps li.done { background: var(--text-light); border-color: var(--text-light); }
.assoc-steps li.now { background: var(--highlight); border-color: var(--text); }
.assoc-form { display: flex; flex-wrap: wrap; gap: 0.75rem; align-items: stretch; }
.assoc-form .assoc-input { order: 1; }
.assoc-form .btn { order: 2; }
.assoc-form .assoc-error { order: 3; flex-basis: 100%; margin: -0.25rem 0 0; }
.assoc-input { flex: 1; min-width: 0; font-size: 1.3rem; min-height: 3.4rem; padding: 0.65rem 0.95rem; }
.assoc-input:lang(zh-Hant) { font-family: 'Open Sans', var(--font-hant), sans-serif; }
.assoc-input:lang(zh-Hans) { font-family: 'Open Sans', var(--font-hans), sans-serif; }
html:lang(zh-Hant) body { font-family: 'Open Sans', var(--font-hant), sans-serif; }
html:lang(zh-Hant) .lead { line-height: 1.75; }
/* Phones: the message sits right under the field, above the button, so the
   soft keyboard does not cover it. */
@media (max-width: 480px) { .assoc-form { flex-direction: column; flex-wrap: nowrap; } .assoc-form .assoc-error { order: 2; margin: -0.25rem 0 0; } .assoc-form .btn { order: 3; justify-content: center; } }
.assoc-cue.long { font-size: clamp(1.5rem, 5vw, 2.2rem); }
#s-block p, #s-intro p { text-wrap: pretty; }

/* Association task: the example chain on the instruction screens */
.assoc-example { margin: 1.5rem 0; padding: 1rem 1.15rem 0.9rem; background: var(--bg-alt); border: 1px solid var(--border); border-radius: 4px; }
.assoc-example figcaption { font-size: 0.95rem; color: var(--text-secondary); margin-bottom: 0.6rem; }
.assoc-example .chain { list-style: none; display: flex; flex-wrap: wrap; align-items: center; row-gap: 0.45rem; }
.assoc-example .chain li { display: flex; align-items: center; }
.assoc-example .chain li span { font-weight: 650; color: var(--text); background: #fff; border: 1px solid var(--border-strong); border-radius: 999px; padding: 0.2rem 0.75rem; }
.assoc-example .chain li.start span { background: var(--highlight); border-color: var(--mint-deep); }
.assoc-example .chain li + li::before { content: '→'; content: '→' / ''; color: var(--text-light); margin: 0 0.45rem; }   /* not read aloud */
html:lang(zh-Hans) .assoc-example { font-family: var(--font-hans); }
.steps li > span { text-wrap: pretty; }
.assoc-example p.small { margin-top: 0.6rem; color: var(--text-secondary); }
.steps kbd { font-size: 0.8em; }

/* ---------- Bird task: one picture per screen ---------- */
.bird-wrap {
    max-width: 44rem;
    margin: 0 auto;
    padding: clamp(1rem, 3vw, 2rem) 1.5rem 2.5rem;
    display: grid;
    gap: 1.1rem;
}
.bird-name {
    font-size: clamp(1.6rem, 4.5vw, 2.3rem);
    line-height: 1.15;
    text-align: center;
    margin: 0.4rem 0 0;
}
/* A fixed-height frame: the scale stays in the same place for every picture. */
.bird-photo {
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    height: min(44vh, 25rem, 70vw);
}
.bird-photo picture { display: contents; }
.bird-photo img {
    display: block;
    width: auto;
    height: auto;
    max-width: 100%;
    max-height: 100%;
    border-radius: 4px;
}
.bird-resp { max-width: 34rem; width: 100%; margin: 0 auto; }
.bird-resp .resp-btn { min-height: 3.5rem; font-size: 1.15rem; font-variant-numeric: tabular-nums; }
.bird-resp .resp-btn:disabled { color: var(--text-light); background: var(--bg-alt); border-color: var(--border); cursor: progress; }
/* Touch screens keep :hover on the last button tapped; on the next picture
   that would look like a pre-selected answer. */
@media (hover: none) { .bird-resp .resp-btn:hover:not(.picked) { border-color: var(--border-strong); } }
/* A picture still on its way: the frame waits, then says so. */
.bird-photo.loading img { visibility: hidden; }
.bird-photo.slow::after {
    content: 'Loading\2026';
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    font-size: 0.92rem;
    color: var(--text-light);
}
.bird-ends {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-top: 0.6rem;
    font-size: 0.84rem;
    line-height: 1.45;
    color: var(--text-secondary);
}
.bird-ends span:last-child { text-align: right; }
.bird-ends strong { font-weight: 650; }
@media (max-height: 640px) { .bird-photo { height: min(38vh, 25rem); } }