.letter-reading{background:#fcfaff;border:1px solid #e8dff0;border-radius:20px;margin:32px 0;padding:clamp(18px,4vw,32px)}.letter-meta{border-bottom:1px solid #e8dff0;grid-template-columns:70px minmax(0,1fr);gap:8px 14px;padding-bottom:24px;display:grid}.letter-meta dt{font-weight:600}.letter-meta dd{overflow-wrap:anywhere;margin:0}.letter-paragraph{margin:26px 0}.blog-prose .letter-paragraph>p[lang=en]{color:#33283e;white-space:pre-wrap;font-size:21px;line-height:1.85}.letter-paragraph details{border-left:3px solid #d9c7ec;padding:8px 0 8px 16px}.letter-paragraph summary,.letter-practice summary{cursor:pointer;color:#765193;font-size:16px}.letter-language-note,.letter-practice{border:1px solid #e8dff0;border-radius:16px;margin:24px 0;padding:24px}.letter-language-note blockquote{font-size:19px}.letter-draft{box-sizing:border-box;width:100%;font:inherit;resize:vertical;color:#33283e;background:#fff;border:1px solid #cfc0da;border-radius:12px;margin:12px 0 20px;padding:16px;line-height:1.7;display:block}.letter-practice form label{margin-bottom:10px;display:block}.letter-practice form p{font-size:16px}@media (width<=580px){.letter-language-note,.letter-practice{padding:18px}.blog-prose .letter-paragraph>p[lang=en]{font-size:19px}.letter-meta{grid-template-columns:60px minmax(0,1fr);font-size:16px}}.letter-reading-question{border-bottom:1px solid #e8dff0;padding:18px 0}.letter-reading-question details{padding:8px 0}.letter-reading-question summary{cursor:pointer;color:#765193;font-size:16px}.blog-prose .article-demo{--demo-accent:#6554d9;--demo-violet:#f0edff;background:#f8f9fd;border:1px solid #e7e7ec;border-radius:24px;margin:32px 0 40px;padding:28px;line-height:1.55;overflow:hidden}.article-demo *{min-width:0}.article-demo .article-demo-label{letter-spacing:.1em;text-transform:uppercase;color:#5d5d6a;margin-bottom:10px;font-size:11px;font-weight:650;display:block}.article-demo .article-demo-title{letter-spacing:-.04em;font-size:clamp(23px,4vw,32px);font-weight:650;line-height:1.25}.article-demo .article-demo-intro{color:#555;max-width:48ch;margin:10px 0 24px;font-size:15px}.article-demo .article-app{background:#fff;border:1px solid #e1e1e8;border-radius:22px;max-width:440px;margin:auto;overflow:hidden;box-shadow:0 10px 30px #17142e08}.article-app .article-app-header{border-bottom:1px solid #efeff3;justify-content:space-between;align-items:center;gap:16px;padding:16px 20px;font-size:13px;display:flex}.article-app-brand{letter-spacing:-.06em;font-size:24px;font-weight:750}.article-app-brand small{letter-spacing:-.03em;font-size:16px;font-weight:450}.article-app .article-preview{aspect-ratio:16/9;text-decoration:none;display:block;position:relative}.article-preview img{object-fit:cover;width:100%;height:100%;margin:0}.article-preview .article-preview-play{color:#111;background:#fff;border-radius:50%;place-items:center;width:54px;height:54px;display:grid;position:absolute;inset:50% auto auto 50%;transform:translate(-50%,-50%);box-shadow:0 3px 20px #0003}.article-preview-play svg{width:22px;height:22px;margin-left:3px}.article-preview .article-preview-time{color:#fff;background:#111d;border-radius:6px;padding:3px 8px;font-size:11px;position:absolute;bottom:10px;right:12px}.article-app .article-caption-help{color:#62626c;margin:0;padding:16px 20px 8px;font-size:12px}.article-caption-list{padding:0 10px 12px}.article-caption{border-radius:12px;margin:6px 0;padding:0 12px}.article-caption[open]{background:var(--demo-violet)}.article-caption summary{cursor:pointer;padding:14px 0;font-size:17px;line-height:1.5}.article-caption summary::marker{color:var(--demo-accent);font-size:11px}.article-caption[open] summary{padding-bottom:6px;font-weight:600}.article-caption .article-caption-translation{color:#62626c;margin:0;padding:0 0 14px 15px;font-size:15px}.article-demo .article-demo-credit{color:#62626c;margin:16px 0 0;font-size:11px;line-height:1.7}.article-demo .article-demo-credit a{text-underline-offset:2px}.article-demo .article-word-card{padding:22px}.article-word-card .article-word-type{color:#62626c;font-size:12px;display:block}.article-word-card .article-word-term{letter-spacing:-.04em;margin:7px 0 20px;font-size:clamp(34px,6vw,44px);font-weight:650;line-height:1.2;display:block}.article-word-card .article-word-meaning{margin-bottom:16px;font-size:19px;font-weight:550}.article-word-card .article-word-example{background:#f6f6f9;border-radius:16px;padding:16px}.article-word-example p{margin:0;font-size:17px}.article-word-example p+p{color:#62626c;margin-top:8px;font-size:14px}.article-demo .article-demo-steps{counter-reset:demo-step;flex-wrap:wrap;gap:6px;margin:20px 0 0;padding:0;list-style:none;display:flex}.article-demo-steps li{background:#fff;border:1px solid #e7e7ec;border-radius:100px;align-items:center;gap:7px;margin:0;padding:6px 10px;font-size:12px;display:inline-flex}.article-demo-steps li:before{counter-increment:demo-step;content:counter(demo-step);color:#6554d9;font-size:10px;font-weight:700}.blog-prose .article-exercise{background:#faf9ff;border:1px solid #e3dff5;border-radius:20px;margin:26px 0;padding:24px;line-height:1.65}.article-exercise .article-exercise-label{letter-spacing:.08em;text-transform:uppercase;color:#5547b4;margin-bottom:8px;font-size:11px;font-weight:650}.article-exercise .article-exercise-question{margin-bottom:14px;font-size:21px;font-weight:550}.article-exercise p{margin-bottom:16px;font-size:16px}.article-exercise details{border-top:1px solid #e3dff5;margin-top:16px;padding-top:14px;font-size:15px}.article-exercise summary{cursor:pointer;min-height:44px;padding-block:5px;font-weight:550}.article-exercise details p{margin:10px 0 0}.article-exercise label{margin-bottom:7px;font-size:14px;font-weight:550;display:block}.article-exercise .article-answer-row{align-items:stretch;gap:10px;display:flex}.article-answer-row input{width:100%;min-width:0;min-height:48px;font:inherit;background:#fff;border:1px solid #d4cfe7;border-radius:12px;padding:10px 14px;font-size:17px}.article-answer-row input[aria-invalid=true]{border-color:#b14040}.article-answer-row button{color:#fff;min-height:48px;font:inherit;cursor:pointer;background:#111;border:0;border-radius:12px;flex-shrink:0;padding:10px 18px;font-size:14px;font-weight:600}.article-exercise [data-recall-feedback]{margin:12px 0 0;font-size:14px}.article-exercise [data-result=correct] [data-recall-feedback]{color:#286142}.article-exercise [data-result=retry] [data-recall-feedback]{color:#8b3333}.article-exercise form[hidden]{display:none}@media (width<=600px){.blog-prose .article-demo{border-radius:20px;margin-block:26px;padding:18px 14px}.article-demo .article-demo-intro{font-size:14px}.article-demo .article-app-header{gap:10px;padding:14px 16px}.article-app .article-caption-help{padding-inline:14px}.article-caption summary{font-size:16px}.article-caption .article-caption-translation{font-size:14px}.article-demo .article-word-card{padding:18px}.article-word-example p{font-size:16px}.blog-prose .article-exercise{padding:20px 16px}}@media (width<=360px){.article-exercise .article-answer-row{flex-direction:column}}.article-comparison-practice .article-cloze-question{border-radius:16px;margin:14px 0;padding:20px 24px}.article-cloze-question .article-cloze-sentence{margin:0 0 12px;font-size:19px;font-weight:500;line-height:2.4;display:block}.article-cloze-number{color:#897699;margin-right:8px;font-size:14px}.article-cloze-sentence input{width:8.5ch;max-width:100%;min-height:44px;font:inherit;color:#4a315f;vertical-align:baseline;background:#fff;border:1px solid #c9bcdd;border-radius:8px;margin:0 5px;padding:4px 9px;line-height:1.4;display:inline-block}.article-cloze-sentence input[aria-invalid=true]{border-color:#b14040}.article-cloze-check{color:#fff;min-height:44px;font:inherit;cursor:pointer;background:#73518e;border:0;border-radius:9px;padding:9px 16px;font-size:14px}.article-cloze-question [data-recall-fallback][hidden]{display:none}.article-cloze-question details p{font-size:15px}.article-cloze-question form[data-result=correct] input{background:#f6fcf7;border-color:#4d8060}@media (width<=600px){.article-comparison-practice .article-cloze-question{padding:18px 16px}.article-cloze-question .article-cloze-sentence{font-size:18px;line-height:2.5}.article-cloze-sentence input{width:7.5ch;margin-inline:3px}}.gotcha-article{max-width:780px;margin:0 auto}.gotcha-reading-toggle{font:inherit;color:#765193;cursor:pointer;background:#fff;border:1px solid #ded2e7;border-radius:20px;margin-bottom:18px;padding:9px 14px;font-size:13px}.gotcha-teaching-list{gap:24px;margin:28px 0;display:grid}.gotcha-teaching-card{background:#faf7fd;border:1px solid #e8dff0;border-radius:18px;grid-template-columns:150px minmax(0,1fr);gap:24px;padding:24px;display:grid}.gotcha-teaching-art{text-align:center;flex-direction:column;align-items:center;display:flex}.gotcha-teaching-art img{object-fit:contain;width:150px;height:150px}.gotcha-teaching-art strong{color:#755096;font-size:25px}.gotcha-teaching-art span{color:#74677f;font-size:13px}.blog-prose .gotcha-teaching-card h3{margin-top:0}.blog-prose .gotcha-teaching-card p{font-size:16px}.blog-prose .gotcha-teaching-card blockquote{margin:16px 0;padding:8px 16px}.blog-prose .gotcha-teaching-card blockquote p{margin:8px 0}.gotcha-teaching-card a{font-size:14px}.gotcha-picture-recall{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;display:grid}.gotcha-picture-recall>div{text-align:center;background:#faf7fd;border:1px solid #e8dff0;border-radius:16px;padding:16px}.gotcha-picture-recall>div>span{text-align:left;color:#82728d;font-size:13px;display:block}.gotcha-picture-recall img{object-fit:contain;width:140px;height:140px;margin:0 auto 12px;display:block}.gotcha-article summary{cursor:pointer;color:#765193;text-underline-offset:4px;font-size:14px}.gotcha-picture-recall details p{font-size:17px}.gotcha-final-review{margin-top:48px}.gotcha-review-item{border:1px solid #e8dff0;border-radius:16px;margin:24px 0;padding:22px}.blog-prose .gotcha-cloze{font-size:20px;font-weight:500}.gotcha-review-item label{margin-bottom:8px;font-size:13px;display:block}.gotcha-answer-row{gap:10px;display:flex}.gotcha-answer-row input{width:100%;min-width:0;font:inherit;background:#fff;border:1px solid #cfc0da;border-radius:8px;padding:10px}.gotcha-answer-row button{color:#fff;font:inherit;cursor:pointer;background:#765193;border:0;border-radius:8px;flex-shrink:0;padding:10px 14px;font-size:14px}.gotcha-review-item [data-recall-feedback]{font-size:14px}.gotcha-review-item details{margin-top:16px}.gotcha-method-note{border-top:1px solid #e8dff0;margin-top:36px;padding-top:20px}.blog-prose .gotcha-method-note h2{font-size:20px}.blog-prose .gotcha-method-note p,.blog-prose .gotcha-method-note li{font-size:14px}.gotcha-article [hidden]{display:none!important}@media (width<=580px){.gotcha-teaching-card{grid-template-columns:1fr;gap:16px;padding:20px}.gotcha-teaching-art img{width:140px;height:140px}.gotcha-answer-row{flex-wrap:wrap}.gotcha-answer-row button{width:100%}.gotcha-picture-recall{gap:10px}.gotcha-picture-recall>div{padding:12px}.gotcha-picture-recall img{width:115px;height:115px}}.gotcha-scene-gallery{grid-template-columns:repeat(auto-fit,minmax(min(100%,180px),1fr));gap:16px;margin:20px 0;display:grid}.gotcha-scene-gallery figure{min-width:0;margin:0}.gotcha-scene-gallery img{aspect-ratio:1;object-fit:contain;width:100%;height:auto;display:block}.gotcha-scene-gallery figcaption{color:#65546f;margin-top:8px;font-size:16px;line-height:1.6}.gotcha-story{margin:32px 0 48px}.gotcha-story-beats{gap:28px;list-style:none;display:grid;padding:0!important}.gotcha-story-beats>li{background:#faf7fd;border:1px solid #e8dff0;border-radius:20px;padding:24px}.gotcha-story-art{text-align:center;max-width:320px;margin:16px auto}.gotcha-story-art img{object-fit:contain;width:100%;height:auto}.gotcha-story-art figcaption{color:#75627f;font-size:16px}.blog-prose .gotcha-story-english{color:#33283e;font-size:21px;font-weight:500;line-height:1.75}.gotcha-story-words{flex-wrap:wrap;gap:8px;display:flex}.gotcha-story-words a{color:#714995;background:#eee5f7;border-radius:20px;padding:6px 14px;font-size:16px;display:inline-block}.blog-prose .gotcha-story-note{color:#75627f;font-size:16px}.gotcha-teaching-card{scroll-margin-top:24px}@media (width<=580px){.gotcha-story-beats>li{padding:18px}.blog-prose .gotcha-story-english{font-size:19px}.gotcha-story-art{max-width:250px}}