.know-wrap { width: 100%; max-width: 760px; margin: 0 auto; padding: 22px 20px 0; }
.know-intro { padding-top: 6px; }
.know-kicker { display: inline-flex; align-items: center; gap: 8px; margin-bottom: 14px; padding: 7px 13px 7px 11px; border-radius: 999px; background: var(--brand-soft); color: var(--brand-ink); font-size: 14px; font-weight: 650; }
.know-kicker .icon { width: 17px; height: 17px; }
.know-intro .page-title em { font-style: normal; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; padding-inline-end: .03em; }
.know-note { display: flex; align-items: center; gap: 8px; margin-top: 12px; color: var(--ink-3); font-size: 14.5px; }
.know-note .icon { flex: none; width: 17px; height: 17px; }

.know-search { position: relative; display: flex; align-items: center; gap: 8px; margin-top: 22px; padding: 6px; border-radius: 999px; background: var(--surface); box-shadow: inset 0 0 0 1px var(--line-2), var(--sh-2); transition: box-shadow .2s; }
.know-search:focus-within { box-shadow: inset 0 0 0 2px var(--brand), var(--sh-2); }
.know-search > .icon { flex: none; width: 20px; height: 20px; margin-inline-start: 12px; color: var(--ink-3); }
.know-search input { flex: 1; min-width: 0; height: 46px; border: 0; outline: 0; background: transparent; font: 500 16.5px/1.2 var(--font); color: var(--ink); }
.know-search input::placeholder { color: var(--muted); }
.know-search .btn { --h: 46px; flex: none; padding: 0 20px; font-size: 15.5px; }
.know-search .btn .icon { display: none; }
@media (max-width: 480px) {
  .know-search > .icon { display: none; }
  .know-search input { padding-inline-start: 14px; }
  .know-search .btn { width: 46px; padding: 0; }
  .know-search .btn span { display: none; }
  .know-search .btn .icon { display: block; }
}

.know-sections { display: grid; gap: 14px; margin-top: 30px; }
@media (min-width: 720px) { .know-sections { grid-template-columns: repeat(3, 1fr); } }
.know-section { display: flex; flex-direction: column; padding: 18px; border-radius: var(--r-lg); background: var(--surface); box-shadow: inset 0 0 0 1px var(--line), var(--sh-1); }
.know-section-head { display: flex; align-items: center; gap: 12px; color: var(--ink); text-decoration: none; }
.know-section-head h2 { font-size: 18px; letter-spacing: -.02em; }
.know-section-icon { flex: none; width: 44px; height: 44px; border-radius: 14px; display: grid; place-items: center; background: var(--brand-soft); color: var(--brand); }
.know-section--grammar .know-section-icon { background: var(--ok-soft); color: var(--ok); }
.know-section--phrases .know-section-icon { background: #FFEFE6; color: #D9622A; }
.know-section-icon .icon { width: 21px; height: 21px; }
.know-count { display: block; margin-top: 3px; color: var(--ink-3); font-size: 13.5px; font-weight: 560; }
.know-chev { width: 18px; height: 18px; margin-inline-start: auto; color: var(--muted); transition: transform .2s var(--ease), color .2s; }
.know-section > p { margin: 12px 0 10px; color: var(--ink-2); font-size: 15px; line-height: 1.5; }
.know-sample { margin: auto 0 0; padding: 10px 0 0; list-style: none; border-top: 1px solid var(--line); display: grid; gap: 2px; }
.know-sample a { display: flex; flex-wrap: wrap; align-items: baseline; gap: 2px 7px; padding: 6px 0; color: var(--ink); font-size: 15px; font-weight: 560; text-decoration: none; }

.know-crumbs { display: flex; flex-wrap: wrap; align-items: center; gap: 4px; margin-bottom: 14px; font-size: 14px; }
.know-crumbs a { color: var(--ink-3); text-decoration: none; font-weight: 560; }
.know-crumbs .icon { width: 15px; height: 15px; color: var(--muted); }

.know-tools { position: sticky; top: var(--top-h); z-index: 5; margin: 22px -20px 0; padding: 10px 20px 12px; background: linear-gradient(var(--bg) 78%, rgba(246, 245, 241, 0)); }
.know-filter { display: flex; align-items: center; gap: 10px; padding: 0 16px; height: 50px; border-radius: 999px; background: var(--surface); box-shadow: inset 0 0 0 1px var(--line-2), var(--sh-1); transition: box-shadow .2s; }
.know-filter:focus-within { box-shadow: inset 0 0 0 2px var(--brand), var(--sh-1); }
.know-filter .icon { flex: none; width: 19px; height: 19px; color: var(--ink-3); }
.know-filter input { flex: 1; min-width: 0; height: 100%; border: 0; outline: 0; background: transparent; font: 500 16px/1.2 var(--font); color: var(--ink); }
.know-letters { display: flex; gap: 2px; margin-top: 10px; overflow-x: auto; scrollbar-width: none; -webkit-mask-image: linear-gradient(90deg, #000 92%, transparent); mask-image: linear-gradient(90deg, #000 92%, transparent); }
.know-letters::-webkit-scrollbar { display: none; }
.know-letters a { flex: none; min-width: 32px; padding: 6px 0; border-radius: 9px; text-align: center; color: var(--ink-2); font-size: 14px; font-weight: 650; text-decoration: none; transition: background-color .2s; }
.know-letters a.is-off { opacity: .3; pointer-events: none; }
.know-empty { margin: 28px 0; color: var(--ink-3); text-align: center; }
.know-group { margin-top: 18px; scroll-margin-top: calc(var(--top-h) + 120px); }
.know-group h2 { position: relative; margin-bottom: 4px; padding-bottom: 6px; border-bottom: 1px solid var(--line); color: var(--ink-3); font-size: 15px; font-weight: 700; letter-spacing: .02em; }
.know-list { margin: 0; padding: 0; list-style: none; columns: 1; column-gap: 28px; }
@media (min-width: 640px) { .know-list { columns: 2; } }
.know-list li { break-inside: avoid; }
.know-list a { display: flex; flex-wrap: wrap; align-items: baseline; gap: 2px 7px; padding: 8px 0; color: var(--ink); font-size: 16px; font-weight: 560; line-height: 1.35; text-decoration: none; }
.know-list--phrases a { font-weight: 520; }

.know-article h1 { font-size: clamp(28px, 6.6vw, 40px); font-weight: 760; letter-spacing: -.035em; line-height: 1.1; text-wrap: balance; }
.know-byline { margin-top: 10px; color: var(--ink-3); font-size: 14px; }
.know-article section { margin-top: 30px; }
.know-article h2 { display: flex; align-items: center; gap: 9px; margin-bottom: 10px; font-size: 20px; letter-spacing: -.02em; }
.know-article h2 .icon { width: 20px; height: 20px; color: var(--brand); }
.know-article h2 em, .know-article h3 { font-style: normal; color: var(--ok); }
.know-article p, .know-article li { color: var(--ink-2); font-size: 16.5px; line-height: 1.62; text-wrap: pretty; }
.know-article p em, .know-article li em { font-style: italic; font-weight: 580; color: var(--ink); }
.know-article section > p + p { margin-top: 12px; }
.know-article p strong { color: var(--ink); font-weight: 680; }

.know-figure { margin: 22px 0 0; }
.know-figure img { display: block; width: 100%; height: auto; border-radius: var(--r-lg); box-shadow: inset 0 0 0 1px var(--line), var(--sh-1); background: var(--surface); }
.know-chart { margin-top: 0; }
.know-byline strong { color: var(--ink-2); font-weight: 650; }
.kv-pills { display: grid; gap: 10px; margin-top: 22px; }
.kv-pill { display: flex; align-items: center; gap: 14px; min-height: 66px; margin: 0; padding: 10px 22px; border-radius: 999px; font-size: clamp(22px, 6vw, 30px); font-weight: 760; letter-spacing: -.025em; line-height: 1.15; overflow-wrap: anywhere; }
.kv-pill .icon { flex: none; width: 24px; height: 24px; stroke-width: 2.6; }
.kv-pill--wrong { background: var(--bad-soft); color: var(--bad); }
.kv-pill--wrong s { text-decoration-thickness: 2.5px; text-decoration-color: rgba(224, 52, 79, .6); }
.kv-pill--right { background: var(--ok-soft); color: var(--ok); }
.kv-pill small { margin-inline-start: auto; padding: 4px 10px; border-radius: 999px; background: rgba(14, 138, 95, .12); font-size: 13px; font-weight: 650; letter-spacing: 0; }
.kv-pair { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: center; gap: 4px 16px; margin-top: 22px; padding: 26px 18px; border-radius: var(--r-lg); background: var(--surface); box-shadow: inset 0 0 0 1px var(--line), var(--sh-1); text-align: center; }
.kv-pair span { font-size: clamp(28px, 8vw, 44px); font-weight: 780; letter-spacing: -.035em; color: var(--ink); overflow-wrap: anywhere; }
.kv-pair i { color: var(--brand); font-size: 20px; font-weight: 600; }
.kv-quote { position: relative; margin: 22px 0 0; padding: 30px 22px 24px 26px; border-radius: var(--r-lg); background: var(--surface); box-shadow: inset 0 0 0 1px var(--line), var(--sh-1); }
.kv-quote::before { content: '“'; position: absolute; top: -6px; left: 18px; font-size: 70px; font-weight: 800; line-height: 1; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.kv-quote p { margin: 0; color: var(--ink); font-size: clamp(22px, 5.6vw, 28px); font-weight: 720; letter-spacing: -.025em; line-height: 1.25; }

.know-answer { padding: 18px 20px; border-radius: var(--r-md); background: var(--brand-soft); }
.know-article .know-answer h2 { margin-bottom: 6px; color: var(--brand-ink); font-size: 14px; font-weight: 700; letter-spacing: .04em; text-transform: uppercase; }
.know-article .know-answer p { color: var(--ink); font-size: 17px; }
.know-chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.know-chip { display: inline-flex; gap: 6px; padding: 5px 11px; border-radius: 999px; background: rgba(255, 255, 255, .75); color: var(--ink-2); font-size: 13.5px; font-weight: 560; line-height: 1.3; }
.know-chip b { color: var(--ink); font-weight: 680; }

.know-tip { padding: 16px 18px; border-radius: var(--r-md); background: #FFF6E5; }
.know-tip h2 .icon { color: #C98500; }

.know-examples { margin: 0; padding: 0; list-style: none; display: grid; gap: 8px; }
.know-examples li { position: relative; padding: 12px 16px 12px 18px; border-radius: 14px; background: var(--surface); box-shadow: inset 0 0 0 1px var(--line); }
.know-examples li::before { content: ''; position: absolute; left: 0; top: 14px; bottom: 14px; width: 3px; border-radius: 0 3px 3px 0; background: var(--ok); }
.know-columns { display: grid; gap: 18px; }
@media (min-width: 640px) { .know-columns { grid-template-columns: 1fr 1fr; } }
.know-column h3 { margin-bottom: 8px; font-size: 18px; letter-spacing: -.02em; }
.know-column:nth-child(2) h3 { color: var(--brand); }
.know-column:nth-child(2) .know-examples li::before { background: var(--brand); }
.know-def { margin-bottom: 10px; }

.know-check { padding: 18px; border-radius: var(--r-lg); background: var(--surface); box-shadow: inset 0 0 0 1px var(--line), var(--sh-2); }
.know-article .know-check-q { color: var(--ink); font-size: 18px; font-weight: 560; }
.know-gap { display: inline-block; min-width: 4.5em; border-bottom: 2px solid var(--ink-3); transition: border-color .2s; }
.know-gap.is-filled { min-width: 0; padding: 0 2px; border-bottom-color: var(--ok); color: var(--ok); font-weight: 700; }
.know-options { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.know-option { appearance: none; min-height: 48px; padding: 0 20px; border: 0; border-radius: 999px; background: var(--bg); box-shadow: inset 0 0 0 1px var(--line-2); color: var(--ink); font: 600 16px/1.2 var(--font); cursor: pointer; transition: background-color .2s, box-shadow .2s, color .2s, transform .15s var(--ease); }
.know-option:active { transform: scale(.97); }
.know-option.is-right { background: var(--ok-soft); box-shadow: inset 0 0 0 2px var(--ok); color: var(--ok); }
.know-option.is-wrong { background: var(--bad-soft); box-shadow: inset 0 0 0 2px var(--bad); color: var(--bad); }
.know-option:disabled { cursor: default; }
.know-option:disabled:not(.is-right):not(.is-wrong) { opacity: .5; }
.know-feedback { margin-top: 12px; font-weight: 650; }
.know-article .know-feedback.is-right { color: var(--ok); }
.know-article .know-feedback.is-wrong { color: var(--bad); }
.know-explain { margin-top: 4px; }

.know-report { margin-top: 30px; padding-top: 16px; border-top: 1px solid var(--line); font-size: 15px; }
.know-article .know-report { color: var(--ink-3); font-size: 15px; }
.know-report a { color: var(--brand-ink); text-underline-offset: 3px; }

.know-cta { display: grid; gap: 16px; margin-top: 36px; padding: 22px; border-radius: var(--r-xl); background: var(--surface); box-shadow: inset 0 0 0 1px var(--line), var(--sh-2); }
.know-cta h2 { font-size: 22px; letter-spacing: -.025em; }
.know-cta p { margin-top: 6px; color: var(--ink-2); font-size: 16px; line-height: 1.5; }
.know-cta .btn { justify-self: start; }
@media (min-width: 640px) { .know-cta { grid-template-columns: 1fr auto; align-items: center; padding: 26px 28px; } }

.know-related { margin-top: 36px; }
.know-related > h2 { margin-bottom: 12px; font-size: 20px; letter-spacing: -.02em; }
.know-cards { margin: 0; padding: 0; list-style: none; display: grid; gap: 10px; }
@media (min-width: 640px) { .know-related .know-cards { grid-template-columns: 1fr 1fr; } }
.know-cards a { display: grid; gap: 6px; height: 100%; padding: 16px 18px; border-radius: var(--r-md); background: var(--surface); box-shadow: inset 0 0 0 1px var(--line); color: var(--ink); text-decoration: none; transition: box-shadow .2s, transform .2s var(--ease); }
.know-cards strong { display: flex; flex-wrap: wrap; align-items: baseline; gap: 2px 7px; font-size: 16.5px; font-weight: 650; line-height: 1.3; }
.know-cards a > span { color: var(--ink-2); font-size: 14.5px; line-height: 1.5; }
.know-cards small { color: var(--ink-3); font-size: 12.5px; font-weight: 650; letter-spacing: .04em; text-transform: uppercase; }
.know-results { margin-top: 24px; }

@media (hover: hover) {
  .know-section-head:hover .know-chev { color: var(--ink); transform: translateX(3px); }
  [dir="rtl"] .know-section-head:hover .know-chev { transform: scaleX(-1) translateX(3px); }
  .know-sample a:hover, .know-list a:hover { text-decoration: underline; text-decoration-color: var(--line-2); text-underline-offset: 4px; }
  .know-letters a:hover { background: rgba(14, 15, 20, .06); }
  .know-crumbs a:hover { color: var(--ink); }
  .know-option:not(:disabled):hover { background: var(--surface); box-shadow: inset 0 0 0 1px var(--ink-3), var(--sh-1); }
  .know-cards a:hover { box-shadow: inset 0 0 0 1px var(--line-2), var(--sh-2); transform: translateY(-1px); }
}

[data-theme="dark"] .know-section--phrases .know-section-icon { background: rgba(255, 138, 76, .16); color: #FF9A5C; }
[data-theme="dark"] .know-tools { background: linear-gradient(var(--bg) 78%, rgba(17, 18, 22, 0)); }
[data-theme="dark"] .know-chip { background: rgba(255, 255, 255, .08); }
[data-theme="dark"] .know-tip { background: #282214; }
[data-theme="dark"] .know-tip h2 .icon { color: #E3A008; }
[data-theme="dark"] .know-chart img { filter: brightness(.88); }
@media (hover: hover) {
  [data-theme="dark"] .know-letters a:hover { background: rgba(255, 255, 255, .08); }
}