.vb { width: min(980px, 100%); display: flex; flex-direction: column; align-items: center; text-align: center; }
.vb-word, .vb-term, .vb-input, .vb-sizer, .vb-opt.is-word .vb-opt-t {
    font-family: var(--px-serif);
    font-weight: 400;
    letter-spacing: -.012em;
}
.vb:lang(ru) .vb-word, .vb:lang(ar) .vb-word, .vb:lang(hi) .vb-word, .vb:lang(zh) .vb-word, .vb:lang(ja) .vb-word, .vb:lang(ko) .vb-word,
.vb:lang(ru) .vb-term, .vb:lang(ar) .vb-term, .vb:lang(hi) .vb-term, .vb:lang(zh) .vb-term, .vb:lang(ja) .vb-term, .vb:lang(ko) .vb-term,
.vb:lang(ru) .vb-input, .vb:lang(ar) .vb-input, .vb:lang(hi) .vb-input, .vb:lang(zh) .vb-input, .vb:lang(ja) .vb-input, .vb:lang(ko) .vb-input,
.vb:lang(ru) .vb-sizer, .vb:lang(ar) .vb-sizer, .vb:lang(hi) .vb-sizer, .vb:lang(zh) .vb-sizer, .vb:lang(ja) .vb-sizer, .vb:lang(ko) .vb-sizer,
.vb:lang(ru) .vb-opt-t, .vb:lang(ar) .vb-opt-t, .vb:lang(hi) .vb-opt-t, .vb:lang(zh) .vb-opt-t, .vb:lang(ja) .vb-opt-t, .vb:lang(ko) .vb-opt-t {
    font-family: var(--px-font);
    font-weight: 500;
    letter-spacing: 0;
}

.vb-prompt { margin-bottom: clamp(22px, 4vh, 40px); font-size: clamp(18px, 2vw, 22px); color: var(--px-text-2); }

.vb-analogy {
    max-width: 920px;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: baseline;
    column-gap: .32em;
    row-gap: .2em;
    font-size: clamp(34px, 5.2vw, 64px);
    line-height: 1.2;
    text-wrap: balance;
}
.vb-word { color: var(--px-text); }
.vb-conn { font-family: var(--px-font); font-size: .36em; color: var(--px-text-3); letter-spacing: .01em; transform: translateY(-.35em); }

.vb-blank { position: relative; display: inline-grid; min-width: 2.6em; vertical-align: baseline; }
.vb-sizer, .vb-input { grid-area: 1 / 1; font-size: 1em; line-height: 1.2; padding: 0 .08em; }
.vb-sizer { visibility: hidden; white-space: pre; }
.vb-input {
    width: 100%;
    min-width: 0;
    border: 0;
    outline: 0;
    background: transparent;
    color: var(--px-accent);
    caret-color: var(--px-accent);
    text-align: center;
}
.vb-input::placeholder { color: color-mix(in srgb, var(--px-accent) 30%, transparent); font-style: italic; }
.vb-line { position: absolute; left: 0; right: 0; bottom: -.04em; height: 2px; border-radius: 1px; background: color-mix(in srgb, var(--px-accent) 45%, transparent); transition: background .3s, box-shadow .3s; }
.vb-blank:focus-within .vb-line { background: var(--px-accent); box-shadow: 0 0 14px var(--px-accent); }
.vb-blank.is-filled .vb-input { color: var(--px-text); }
.vb-blank:focus-within { outline: 0; }
.vb .vb-input:focus-visible { outline: none; }
.vb-hint { margin-top: clamp(22px, 4vh, 36px); font-size: 14px; color: var(--px-text-3); }

.vb-series { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: .3em .5em; font-size: clamp(30px, 4.4vw, 54px); line-height: 1.2; }
.vb-term { opacity: 0; transform: translateY(8px); animation: vb-up .6s var(--px-ease) forwards; animation-delay: calc(var(--i) * 90ms + 80ms); }
@keyframes vb-up { to { opacity: 1; transform: none; } }
.vb-term.is-slot { min-width: 3.4em; }
.vb-chev { width: .42em; height: .42em; color: var(--px-text-3); flex: none; }
[dir="rtl"] .vb-chev { transform: scaleX(-1); }

.vb-odd-list { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px 14px; max-width: 900px; }
.vb-opt {
    position: relative;
    border: 0;
    background: transparent;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    opacity: 0;
    animation: vb-up .55s var(--px-ease) forwards;
    animation-delay: calc(var(--i) * 70ms + 60ms);
}
.vb-opt.is-word {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    min-width: 132px;
    padding: 18px 24px 14px;
    border-radius: 18px;
    transition: background .3s var(--px-ease), box-shadow .3s var(--px-ease), opacity .3s;
}
.vb-opt.is-word .vb-opt-t { font-size: clamp(30px, 3.6vw, 44px); line-height: 1.05; color: var(--px-text); }
.vb-opt.is-word .vb-opt-k { order: 2; font-size: 12px; color: var(--px-text-3); font-variant-numeric: tabular-nums; }
.vb-opt.is-word:hover { background: var(--px-glass); }
.vb-opt.is-word[aria-checked="true"] { background: color-mix(in srgb, var(--px-accent) 9%, transparent); box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--px-accent) 60%, transparent), 0 0 34px -12px var(--px-accent); }
.vb-opt.is-word[aria-checked="true"] .vb-opt-k { color: var(--px-accent); }
.vb.has-pick .vb-opt.is-word[aria-checked="false"] .vb-opt-t { color: var(--px-text-2); }

.vb-premises { display: grid; gap: 12px; width: min(720px, 100%); text-align: start; counter-reset: p; }
.vb-premises li {
    display: grid;
    grid-template-columns: 34px 1fr;
    align-items: baseline;
    font-size: clamp(18px, 1.9vw, 21px);
    line-height: 1.5;
    color: var(--px-text);
    opacity: 0;
    animation: vb-up .55s var(--px-ease) forwards;
    animation-delay: calc(var(--i) * 80ms + 60ms);
}
.vb-pn { font-family: var(--px-serif); font-style: italic; font-size: 20px; color: var(--px-accent); }
.vb-question {
    width: min(720px, 100%);
    margin-top: clamp(18px, 3vh, 28px);
    padding-top: clamp(16px, 2.6vh, 24px);
    border-top: 1px solid var(--px-line-2);
    text-align: start;
    font-size: clamp(19px, 2vw, 23px);
    font-weight: 560;
    letter-spacing: -.01em;
}
.vb-logic-list { display: grid; gap: 8px; width: min(720px, 100%); margin-top: 16px; }
.vb-opt.is-row {
    display: grid;
    grid-template-columns: 30px 1fr;
    align-items: center;
    gap: 12px;
    min-height: 54px;
    padding: 10px 16px;
    border-radius: 14px;
    text-align: start;
    font-size: 17px;
    color: var(--px-text);
    box-shadow: inset 0 0 0 1px var(--px-line);
    transition: background .25s var(--px-ease), box-shadow .25s var(--px-ease);
}
.vb-opt.is-row .vb-opt-k {
    display: grid;
    place-items: center;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    box-shadow: inset 0 0 0 1px var(--px-line-3);
    font-size: 12px;
    color: var(--px-text-3);
    transition: background .25s, color .25s, box-shadow .25s;
}
.vb-opt.is-row:hover { background: var(--px-glass); }
.vb-opt.is-row[aria-checked="true"] { background: color-mix(in srgb, var(--px-accent) 8%, transparent); box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--px-accent) 65%, transparent); }
.vb-opt.is-row[aria-checked="true"] .vb-opt-k { background: var(--px-accent); color: var(--px-ink); box-shadow: 0 0 12px var(--px-accent); }

.vb-demo, .vb-demo-line, .vb-demo-logic { position: absolute; inset: 0; display: flex; flex-wrap: wrap; justify-content: center; align-items: center; align-content: center; gap: 8px 14px; padding: 0 6%; }
.vb-demo-line { font-size: 30px; column-gap: 10px; }
.vb-demo-line .vb-conn { font-size: 13px; transform: none; }
.vb-demo-type { color: var(--px-accent); border-bottom: 2px solid var(--px-accent); animation: vb-type 3.4s steps(1) infinite; }
@keyframes vb-type { 0%, 30% { opacity: 0; } 31%, 100% { opacity: 1; } }
.vb-demo-w { font-family: var(--px-serif); font-size: 30px; color: var(--px-text-2); }
.vb-demo-w.is-odd { color: var(--px-accent); animation: vb-glow 2.6s var(--px-ease) infinite; }
@keyframes vb-glow { 0%, 40% { text-shadow: none; color: var(--px-text-2); } 60%, 100% { text-shadow: 0 0 18px var(--px-accent); color: var(--px-accent); } }
.vb-demo-logic { flex-direction: column; align-items: flex-start; padding: 0 16%; font-size: 17px; text-align: start; gap: 6px; }
.vb-demo-logic p { display: flex; gap: 12px; align-items: baseline; }
.vb-demo-logic .vb-demo-type { border: 0; padding-left: 26px; font-family: var(--px-serif); font-style: italic; font-size: 20px; }

@media (max-width: 720px) {
    .vb-opt.is-word { min-width: 0; padding: 12px 16px 10px; }
    .vb-odd-list { gap: 6px; }
    .vb-premises li { grid-template-columns: 26px 1fr; font-size: 17px; }
    .vb-opt.is-row { font-size: 16px; min-height: 50px; }
}