/* Grammar shares the site's type, spacing and four colour themes. */
.grammar-main { max-width: 920px; padding-block: clamp(32px,5vw,66px) 84px; }
.grammar-lesson { max-width: 730px; margin-inline: auto; }
.grammar-main h1 { font-size: clamp(34px,4.6vw,52px); }
.grammar-overview { display: flex; flex-wrap: wrap; align-items: baseline; gap: 12px 30px; margin: 32px 0 22px; color: var(--muted); font-size: 14px; }
.grammar-overview strong { color: var(--ink); font-size: 22px; }
.grammar-search { padding: 28px 0 10px; }
.grammar-search label { display: block; font-weight: 650; margin-bottom: 10px; }
.grammar-search input { width: 100%; min-height: 48px; padding: 12px 16px; border: 1px solid var(--border-strong); border-radius: var(--radius); background: var(--surface); color: var(--ink); font: inherit; }
.grammar-search-row { display: flex; gap: 10px; align-items: center; }
.grammar-search-row input { flex: 1; min-width: 0; }
.grammar-search-row button { flex: none; }
.grammar-level-heading { display: flex; flex-wrap: wrap; align-items: baseline; gap: 8px 24px; justify-content: space-between; }
.grammar-level-heading > a { display: inline-flex; align-items: center; min-height: 44px; font-size: 14px; }
.grammar-topic-nav { display: flex; flex-wrap: wrap; gap: 4px 18px; padding: 2px 0 14px; }
.grammar-topic-nav a { display: inline-flex; align-items: center; min-height: 44px; font-size: 13px; }
.grammar-topic { padding-top: 22px; }
.grammar-topic > h3 { padding: 12px 14px; border-radius: var(--radius-sm); background: var(--accent-tint); font-size: 16px; }
.grammar-prerequisites { margin-top: 24px; padding: 12px 16px; border: 1px solid var(--border); border-radius: var(--radius); }
.grammar-prerequisites summary { cursor: pointer; min-height: 30px; line-height: 1.6; font-size: 14px; }
.grammar-prerequisites p, .grammar-prerequisites li { font-size: 14px; line-height: 1.7; }
.grammar-prerequisites p { margin-top: 14px; }
.grammar-prerequisites a { display: inline-block; padding-block: 7px; }
.grammar-search p { margin: 10px 0 0; font-size: 13px; color: var(--muted); }
.grammar-list { list-style: none; margin: 0; padding: 0; }
.grammar-item { margin: 0 !important; border-bottom: 1px solid var(--border); }
.grammar-item:last-child { border-bottom: 0; }
.grammar-item > a { display: grid; grid-template-columns: 32px minmax(0,1fr) 18px; align-items: start; gap: 18px; padding: 22px 10px; border-radius: var(--radius-sm); }
.grammar-item > a:hover { background: var(--accent-tint); }
.section .grammar-list .grammar-item > a { text-decoration: none; }
.section .grammar-list .grammar-item > a:hover strong { text-decoration: underline; text-underline-offset: 4px; }
.grammar-number { color: var(--muted); font: 23px var(--serif); padding-top: 3px; }
.grammar-item strong { display: block; margin: 8px 0 6px; font: 600 23px/1.3 var(--serif); color: var(--ink); }
.grammar-item-goal { display: block; color: var(--muted); font-size: 14px; line-height: 1.6; }
.grammar-breadcrumb, .grammar-jumps { display: flex; flex-wrap: wrap; gap: 10px 20px; font-size: 13px; }
.grammar-breadcrumb { margin-bottom: 30px; color: var(--muted); }
.grammar-jumps { padding-block: 20px; margin-top: 20px; border-block: 1px solid var(--border); }
.grammar-jumps a { display: inline-flex; align-items: center; min-height: 44px; }
.grammar-main :is(section,nav)[id] { scroll-margin-top: 24px; }
.grammar-source { color: var(--muted); font-size: 13px !important; margin-bottom: 22px !important; }
.grammar-lesson .section { padding-block: clamp(40px,6vw,64px); }
.grammar-lesson .section:first-of-type { padding-top: clamp(32px,5vw,48px); }
.grammar-lesson .section h2 { margin-bottom: 20px; }
.grammar-lesson .section h3 { margin: 36px 0 14px; font-size: 18px; }
.grammar-lesson .hero { padding-bottom: clamp(26px,4vw,38px); }
.grammar-lesson .grammar-prerequisites { margin-top: 28px; }
.grammar-jumps { gap: 10px; padding-block: 22px 8px; margin-top: 8px; border-block: 0; }
.grammar-jumps a { padding-inline: 18px; border: 1px solid var(--border-strong); border-radius: 999px; background: var(--surface); color: var(--accent-strong); font-weight: 650; }
.grammar-jumps a:hover { background: var(--accent-tint); }

/* Inline helpers: English terms and Spanish emphasis inside authored copy */
.grammar-lesson .en { padding: 1px 5px; border-radius: 6px; background: var(--accent-tint); color: var(--accent-strong); font: 600 1.04em var(--serif); overflow-wrap: anywhere; }
.grammar-lesson .en.nw { white-space: nowrap; }
.grammar-lesson :is(.grammar-key,.grammar-notice,.grammar-tip,.grammar-form-list li) .en { background: var(--surface); }
.grammar-lesson strong { color: var(--ink); }

/* 1 · Observe */
.grammar-lesson .grammar-notice { display: flex; align-items: baseline; gap: 14px; max-width: none; margin: 0 0 26px; padding: 15px 18px; border: 1px solid var(--border-strong); border-radius: var(--radius); background: var(--accent-tint); color: var(--ink); font-size: 16px; line-height: 1.65; }
.grammar-notice-label { flex: none; font-size: 11px; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; color: var(--accent-strong); }
.grammar-tools { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px 20px; margin: 0 0 14px; }
.grammar-lesson .grammar-hint { display: flex; align-items: center; gap: 10px; margin: 0; color: var(--muted); font-size: 13px; line-height: 1.5; }
.grammar-hint-icon { display: inline-grid; place-items: center; flex: none; width: 28px; height: 28px; border-radius: 8px; background: var(--accent-tint); color: var(--accent-strong); font: 700 12px var(--serif); }
.speed-toggle { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; padding: 0 16px; border: 1px solid var(--border-strong); border-radius: 999px; background: var(--surface); color: var(--accent-strong); font-size: 13px; font-weight: 680; }
.speed-toggle:hover { background: var(--accent-tint); }
.speed-toggle[aria-pressed=true] { border-color: var(--accent); background: var(--accent-tint); }
.speed-toggle[aria-pressed=true]::before { content: "✓"; }
.grammar-lesson .audio-status { min-height: 0; max-width: none; margin: 0 0 12px; color: var(--muted); font-size: 13px; line-height: 1.5; }
.audio-status:empty { display: none; }
.grammar-quote { margin: 0 0 22px; border: 1px solid var(--border); border-left: 4px solid var(--accent); border-radius: var(--radius); background: var(--surface); }
.grammar-quote-tools { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 10px 12px 0 clamp(18px,3.4vw,28px); }
.grammar-quote-label { color: var(--muted); font-size: 11px; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.grammar-excerpt { margin: 0; padding: 6px clamp(18px,3.4vw,28px) clamp(20px,3.4vw,28px); }
.grammar-lesson .grammar-excerpt p { max-width: none; margin: 0; color: var(--ink); font: 400 clamp(20px,2.5vw,24px)/1.8 var(--serif); }
.grammar-excerpt[data-trim-start] p::before { content: "… "; color: var(--muted); }
.grammar-excerpt[data-trim-end] p::after { content: " …"; color: var(--muted); }
.grammar-lesson mark { padding: 0 3px; border-bottom: 2px solid var(--accent); border-radius: 3px 3px 0 0; background: var(--accent-tint); color: var(--accent-strong); font-weight: 600; }
.grammar-lesson .grammar-caption { max-width: none; margin: 4px 0 0; color: var(--muted); font-size: 13px; line-height: 1.7; }

/* Listen buttons: round icon beside examples, labelled pill above a fragment */
.audio-btn { display: inline-grid; flex: none; place-items: center; width: 46px; height: 46px; padding: 0; border: 1px solid var(--border-strong); border-radius: 50%; background: var(--surface); color: var(--accent-strong); transition: background .15s, color .15s, border-color .15s; }
.audio-btn:hover { background: var(--accent-tint); border-color: var(--accent); }
.audio-btn svg { width: 20px; height: 20px; }
.audio-btn .icon-stop, .audio-btn.is-playing .icon-play { display: none; }
.audio-btn.is-playing .icon-stop { display: block; }
.audio-btn.is-playing { border-color: var(--accent); background: var(--accent); color: var(--accent-contrast); }
.audio-btn.is-loading { cursor: progress; opacity: .75; }
.audio-btn.has-error { border-color: var(--negative); color: var(--negative); }
.audio-btn--label { display: inline-flex; align-items: center; gap: 8px; width: auto; min-height: 44px; padding: 0 18px 0 14px; border-radius: 999px; font-size: 13px; font-weight: 700; }
@media (prefers-reduced-motion: no-preference) {
  .audio-btn.is-playing:not(.is-loading) { animation: audio-pulse 1.4s ease-out infinite; }
}
@keyframes audio-pulse { 0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 45%, transparent); } 100% { box-shadow: 0 0 0 12px transparent; } }

/* 2 · Understand */
.grammar-lesson .grammar-key { max-width: none; margin: 0 0 28px; padding: 22px 24px; border: 1px solid var(--border-strong); border-left: 4px solid var(--accent); border-radius: var(--radius); background: var(--accent-tint); color: var(--ink); font: 600 clamp(20px,2.4vw,23px)/1.55 var(--serif); }
.grammar-lesson .grammar-key .en { font-size: 1em; }
.grammar-lesson .grammar-points { display: grid; gap: 16px; margin: 0 0 32px; padding: 0; list-style: none; }
.grammar-lesson .grammar-points li { position: relative; margin: 0; padding-left: 32px; font-size: 16px; line-height: 1.75; }
.grammar-lesson .grammar-points li::before { content: ""; position: absolute; left: 4px; top: .6em; width: 11px; height: 11px; border: 2px solid var(--accent); border-radius: 50%; background: var(--accent-tint); }
.grammar-form { margin: 0 0 32px; padding: 20px 22px 22px; border: 1px solid var(--border-strong); border-radius: var(--radius); background: var(--surface); }
.grammar-lesson .grammar-form-label, .grammar-lesson .grammar-tip-label { max-width: none; margin: 0 0 14px; color: var(--muted); font-size: 11px; font-weight: 800; letter-spacing: .1em; line-height: 1.4; text-transform: uppercase; }
.grammar-lesson .grammar-form-list { display: flex; flex-wrap: wrap; gap: 10px; margin: 0; padding: 0; list-style: none; }
.grammar-lesson .grammar-form-list li { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin: 0; padding: 10px 14px; border: 1px solid var(--border); border-radius: 10px; background: var(--accent-tint); color: var(--ink); font-size: 16px; line-height: 1.5; }
.grammar-lesson .grammar-form-list li.is-formula { flex-basis: 100%; padding: 0; border: 0; background: none; }
.chip { padding: 7px 12px; border: 1px dashed var(--border-strong); border-radius: 9px; background: var(--page); color: var(--muted); font-size: 15px; line-height: 1.4; }
.chip-en { border: 0; background: var(--accent); color: var(--accent-contrast); font: 700 17px/1.4 var(--serif); }
.plus { color: var(--muted); font-weight: 700; }
.grammar-lesson .grammar-tip { margin: 0 0 32px; padding: 16px 20px; border-radius: 0 var(--radius) var(--radius) 0; border-left: 4px solid var(--border-strong); background: var(--accent-tint); }
.grammar-lesson .grammar-tip p:last-child { max-width: none; margin: 0; font-size: 15px; line-height: 1.75; }
.grammar-lesson .grammar-tip-label { margin-bottom: 6px; }
.grammar-examples { display: grid; gap: 14px; }
.grammar-example { display: flex; align-items: center; gap: 18px; padding: 16px 18px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
.grammar-example > div { min-width: 0; }
.grammar-lesson .grammar-example-en { max-width: none; margin: 0 0 4px; color: var(--ink); font: 400 clamp(20px,2.4vw,23px)/1.5 var(--serif); }
.grammar-lesson .grammar-example-es { max-width: none; margin: 0; color: var(--muted); font-size: 14px; line-height: 1.55; }
.grammar-mistake { margin-top: 40px; padding: clamp(18px,3vw,26px); border: 1px solid var(--border-strong); border-radius: var(--radius); }
.grammar-lesson .grammar-mistake h3 { margin-top: 0; }
.grammar-wrong, .grammar-right { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px; margin: 0 0 12px; padding: 12px 16px; border-radius: var(--radius-sm); }
.grammar-wrong { border: 1px solid var(--bad-border); background: var(--negative-tint); color: var(--negative); }
.grammar-right { border: 1px solid var(--ok-border); background: var(--positive-tint); color: var(--positive); }
.grammar-label { flex: none; min-width: 74px; font-size: 12px; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; }
.grammar-lesson .grammar-sentence { flex: 1 1 200px; max-width: none; margin: 0; font: 400 clamp(19px,2.3vw,22px)/1.5 var(--serif); }
.grammar-wrong .grammar-sentence { text-decoration: line-through; text-decoration-thickness: 2px; }
.grammar-right .grammar-sentence { font-weight: 600; }
.grammar-sentence-hint { flex-basis: 100%; padding-left: 88px; font-size: 13px; opacity: .9; }
.grammar-lesson .grammar-why { max-width: none; margin: 16px 0 0; font-size: 15px; line-height: 1.75; }
.grammar-main .quiz-result { margin-top: 16px; }
.grammar-quiz-progress { color: var(--muted); font-weight: 650; }
.grammar-question-pending { color: var(--negative); font-weight: 650; }
.grammar-quiz-next { display: flex; align-items: center; flex-wrap: wrap; gap: 16px; margin-top: 20px; }
.grammar-return { position: sticky; z-index: 65; top: 0; display: flex; align-items: center; flex-wrap: wrap; gap: 6px 18px; padding: 10px 16px; margin-block: 16px; border: 1px solid var(--border-strong); border-radius: var(--radius); background: var(--page); }
.grammar-return span { flex: 1 1 230px; font-size: 13px; line-height: 1.5; }
.grammar-return a { display: inline-flex; align-items: center; min-height: 44px; font-size: 14px; font-weight: 650; }
.grammar-return[hidden], .grammar-quiz-next[hidden], .grammar-topic[hidden], .grammar-topic-nav[hidden], .grammar-level-heading > a[hidden] { display: none; }
.grammar-reading-context .story-text p:target { scroll-margin-top: 150px; background: var(--accent-tint); border-radius: var(--radius-sm); outline: 2px solid var(--border-strong); outline-offset: 8px; }
body.reading-mode .grammar-return { display: none; }
.grammar-reading-card { display: grid; gap: 10px; padding: 22px; border: 1px solid var(--border-strong); border-radius: var(--radius); background: var(--accent-tint); }
.grammar-reading-card > span { font-size: 12px; }
.grammar-reading-card > strong { font: 600 26px/1.3 var(--serif); }
.grammar-practice-heading { margin-top: 24px !important; }
.grammar-practice { padding-left: 20px; }
.grammar-pagination { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 16px; padding-top: 28px; }
.grammar-pagination a { display: grid; align-content: start; gap: 12px; padding: 20px; border: 1px solid var(--border); border-radius: var(--radius); }
.grammar-pagination span { color: var(--muted); font-size: 12px; }
.grammar-pagination strong { font-size: 15px; line-height: 1.5; }
.grammar-pagination a:hover, .grammar-reading-card:hover { border-color: var(--accent); }
.reading-grammar { margin-top: 30px; }
.grammar-related-list { list-style: none; padding: 0; margin: 18px 0; }
.grammar-related-list li { margin: 0; border-bottom: 1px solid var(--border); }
.grammar-related-list a { display: flex; align-items: center; gap: 14px; min-height: 56px; padding: 12px 4px; font-size: 14px; }
.grammar-related-list a > span:nth-child(2) { flex: 1; }
.reading-grammar details > summary { padding-block: 14px; cursor: pointer; }
.grammar-home { margin-top: 24px; }
body.reading-mode .reading-grammar { display: none; }
[data-grammar-item][hidden], [data-grammar-group][hidden] { display: none; }
@media (max-width: 600px) {
  .grammar-search-row { flex-wrap: wrap; }
  .grammar-search-row input { flex-basis: 100%; }
  .grammar-main .btns { align-items: stretch; }
  .grammar-main .btns .btn { white-space: normal; }
  .grammar-item > a { gap: 10px; padding-inline: 0; }
  .grammar-item strong { font-size: 21px; }
  .grammar-pagination { grid-template-columns: 1fr; }
  .grammar-jumps { gap: 8px; }
  .grammar-jumps a { padding-inline: 14px; }
  .grammar-lesson .grammar-notice { flex-direction: column; gap: 6px; padding: 14px 16px; }
  .grammar-tools { align-items: stretch; }
  .speed-toggle { justify-content: center; }
  .grammar-quote { border-left-width: 3px; }
  .grammar-lesson .grammar-key { padding: 18px; }
  .grammar-lesson .grammar-points li { padding-left: 28px; }
  .grammar-form { padding: 16px 16px 18px; }
  .grammar-example { gap: 12px; padding: 14px; }
  .grammar-sentence-hint { padding-left: 0; }
  .grammar-label { min-width: 0; }
}
@media print {
  .grammar-search, .grammar-jumps, .grammar-pagination, .reading-grammar, .grammar-return, .grammar-topic-nav { display: none; }
  .grammar-main { padding: 0; max-width: none; }
  .grammar-tools, .audio-btn, .audio-status, .speed-toggle { display: none; }
  .grammar-quote, .grammar-mistake, .grammar-example, .grammar-key, .grammar-form { break-inside: avoid; }
  .grammar-lesson mark { color: #000; background: #fff; border-color: #000; }
}

/* Quiz: air between the options, the correction and the next question */
.grammar-main .question { padding-block: 30px; }
.grammar-main .question legend { padding-bottom: 18px; font-size: 17px; line-height: 1.55; }
.grammar-main .options { gap: 12px; }
.grammar-main .answer-feedback { margin: 22px 0 0; padding: 16px 18px; line-height: 1.7; }
.grammar-main .grammar-question-pending { margin: 0 0 14px; }
.grammar-main [data-quiz] .btns { margin-top: 12px; }
.grammar-main .quiz-result { margin-top: 22px; }
.grammar-main .grammar-quiz-next { margin-top: 26px; }
@media (max-width: 600px) {
  .grammar-main .question { padding-block: 26px; }
  .grammar-main .answer-feedback { margin-top: 18px; padding: 14px 16px; }
}
.grammar-main .question legend { padding-bottom: 14px; }
.grammar-main .question .option { min-height: 52px; padding: 13px 16px; font-size: 15px; }
.grammar-main .grammar-quiz-progress { margin: 10px 0 14px; font-size: 14px; }
.grammar-main #miniquiz > p:first-of-type { margin-bottom: 18px; }
.grammar-main .question { border-top-color: var(--border-strong); }
.grammar-main [data-quiz] .btns { margin-top: 20px; padding-top: 24px; border-top: 1px solid var(--border-strong); }
.grammar-main .answer-feedback, .grammar-main .quiz-result, .grammar-main .grammar-question-pending { max-width: none; }
.grammar-main .question legend { padding-bottom: 6px; }