/* Scope: layout, learning flow and lesson pages; existing palette is unchanged. */
.video-frame{width:100%;min-width:0}
.video-frame iframe{position:absolute;inset:0;width:100%;height:100%}
.intro-actions{display:flex;align-items:center;gap:22px;margin-top:20px;flex-wrap:wrap}
.primary-button{display:inline-flex;align-items:center;justify-content:center;background:var(--ink);color:var(--paper);border:1px solid var(--ink);padding:12px 18px;text-decoration:none;font-size:14px;font-weight:600;cursor:pointer}
.filter-panel{border-top:1px solid var(--line);padding:14px 0 0;margin-top:20px}
.filter-panel summary{cursor:pointer;font-size:14px;font-weight:600}
.filter-panel summary span{font-size:12px;font-weight:400;color:var(--muted);margin-left:10px}
.filter-panel[open] summary{margin-bottom:22px}
.search-field small{display:block;color:var(--muted);font-size:12px;line-height:1.4;margin-top:7px;font-weight:400}
.search-help{font-size:13px;color:var(--muted);line-height:1.5}
.library-feedback{font-size:13px;padding:0;border:0;margin:0 0 18px;line-height:1.5}
.library-feedback a,.lesson-detail-link{text-decoration:underline;text-underline-offset:3px}
.lesson-detail-link{display:inline-block;font-size:13px;margin-top:10px}
.poster-with-thumb .poster-label,.poster-with-thumb .poster-number,.poster-with-thumb .poster-brand{visibility:hidden}
.poster-with-thumb::before{background:linear-gradient(transparent 70%,#0007)}
.poster-with-thumb .poster-footer{justify-content:flex-end}
.video-meta{flex-wrap:wrap}
.lesson-page{max-width:900px;padding-top:36px}
.lesson-page h1{font-size:clamp(30px,5vw,52px);letter-spacing:-1.5px;line-height:1.08;max-width:850px}
.lesson-page p,.lesson-page li{line-height:1.65}
.lesson-lead{font-size:18px;color:var(--muted);max-width:720px}
.lesson-page section{margin-top:32px;border-top:1px solid var(--line);padding-top:24px}
.lesson-page h2{font-size:25px;margin:0 0 14px}
.lesson-page h3{font-size:18px}
.lesson-player{margin-top:28px}
.lesson-play{position:absolute;inset:0;width:100%;height:100%;padding:0;border:0;background:var(--ink);cursor:pointer;color:var(--paper)}
.lesson-play img{width:100%;height:100%;object-fit:cover}
.lesson-play span{position:absolute;bottom:18px;left:18px;background:var(--ink);padding:12px 20px;font-weight:600}
.lesson-actions{display:flex;gap:20px;align-items:center;flex-wrap:wrap;margin-top:18px;font-size:14px}
.lesson-actions .practice-check{border:0;padding:0;margin:0;min-width:auto}
.lesson-actions .primary-button{margin-left:auto}
#lesson-storage-note{font-size:12px;color:var(--muted)}
.transcript,.report-panel{margin-top:24px;border:1px solid var(--line);padding:18px}
.transcript summary,.report-panel summary{cursor:pointer;font-weight:600;line-height:1.5}
.transcript summary span{display:block;font-size:12px;font-weight:400;color:var(--muted);margin-top:6px}
.transcript ol{list-style:none;padding:0}
.transcript li{display:grid;grid-template-columns:50px 1fr;gap:12px;margin-bottom:12px}
.transcript li a{font-family:var(--mono);font-size:12px;padding-top:3px;text-decoration:underline}
.report-panel label{display:block;margin:16px 0 7px;font-size:14px}
.report-panel input,.report-panel textarea{background:var(--paper);color:var(--ink);border:1px solid var(--line);padding:10px;width:100%;font:14px/1.5 var(--sans);box-sizing:border-box}
.report-panel textarea{resize:vertical}
.report-panel button{margin:14px 12px 0 0}
.report-panel a{font-size:14px;text-decoration:underline}
.learning-path{padding-left:25px}
.learning-path li{padding:16px 0;border-bottom:1px solid var(--line)}
.learning-path a{text-decoration:underline}
.learning-path span{display:block;font:12px var(--mono);color:var(--muted);margin-top:7px}
@media(max-width:1050px) and (min-width:761px){.video-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:760px){.intro{padding-top:26px;padding-bottom:25px}.library-heading{padding-bottom:12px;gap:8px}.library-controls{padding-top:16px}.lesson-page{padding-top:24px}.lesson-actions .primary-button{margin-left:0}}
@media(max-width:520px){.intro-description{margin-bottom:12px}.practice-sequence{margin-top:12px}.intro-actions{gap:16px;margin-top:16px}.library-scope{font-size:13px;line-height:1.5;margin-bottom:12px}.library-feedback{font-size:12px;margin-bottom:12px}.search-progress-row{gap:12px}.practice-progress p{font-size:12px}.filter-panel{margin-top:14px}.filter-panel summary span{display:block;margin:5px 0 0 16px}.lesson-index{margin-top:14px}.result-summary{margin-bottom:16px}.lesson-page .header-nav{gap:12px}.lesson-actions{gap:12px}.report-panel,.transcript{padding:14px}}
@media(max-width:520px){body:has(.lesson-page) .site-header{flex-wrap:wrap;gap:14px;padding-block:16px}body:has(.lesson-page) .header-nav{flex-basis:100%;gap:24px;justify-content:flex-start}body:has(.lesson-page) .header-nav a{white-space:nowrap}.search-field small{margin-top:5px}.lesson-index summary{padding-block:14px}.library-controls{margin-bottom:14px}.intro h1{max-width:none;font-size:40px;letter-spacing:-1.8px;line-height:1.03}.intro .brand-art{display:none}}