.lesson-main,.lesson-detail-main{flex:1;padding:0 22px 30px}
.lesson-kicker,.lesson-section-heading p{margin:0 0 7px;color:var(--cinnabar);font-family:var(--font-wen);font-size:11px;letter-spacing:.18em}
.lesson-filters{padding:20px 0 9px;border-bottom:1px solid var(--rule)}
.lesson-search{height:42px;display:flex;border-bottom:1px solid var(--ink-soft)}
.lesson-search input{min-width:0;flex:1;border:0;background:transparent;outline:0;font-size:13px}
.lesson-search button{flex:0 0 auto;padding:0 6px;color:var(--cinnabar);font-family:var(--font-wen);font-size:14px}
.lesson-filters fieldset{min-width:0;margin:15px 0 0;padding:0;border:0}
.lesson-filters legend{float:left;width:42px;padding:7px 0;color:var(--ink-soft);font-size:11px}
.filter-strip{display:flex;gap:4px;overflow:auto;padding-bottom:4px;scrollbar-width:none}
.filter-strip::-webkit-scrollbar{display:none}
.filter-strip button{min-height:31px;flex:0 0 auto;padding:5px 10px;border-radius:16px;color:var(--ink-soft);font-size:11px;white-space:nowrap}
.filter-strip button.active{background:var(--cinnabar);color:#fff8ea}
.lesson-result-summary{margin:18px 0;color:var(--ink-soft);font-size:11px}
.lesson-group{margin-top:26px}
.lesson-group-heading{display:flex;align-items:baseline;justify-content:space-between;padding-bottom:9px;border-bottom:2px solid var(--ink)}
.lesson-group-heading h2{margin:0;font-family:var(--font-wen);font-size:21px;letter-spacing:.12em}
.lesson-group-heading span{color:var(--ink-soft);font-size:10px}
.lesson-list{display:flex;flex-direction:column}
.lesson-row{position:relative;display:grid;grid-template-columns:90px minmax(0,1fr) 14px;gap:12px;align-items:start;padding:18px 0;border-bottom:1px solid var(--rule);text-decoration:none}
.lesson-row-visual{width:90px;height:90px;display:grid;place-items:center;overflow:hidden;border-radius:20px}
.lesson-row-grade{width:42px;height:42px;grid-area:1/1;display:grid;place-items:center;border:1px solid var(--rule);border-radius:50%;color:var(--cinnabar);font-family:var(--font-wen);font-size:15px}
.lesson-row-cover{width:100%;height:100%;grid-area:1/1;object-fit:cover;opacity:0}
.lesson-row-visual.has-cover{border:1px solid var(--rule);background:var(--paper-deep)}
.lesson-row-visual.has-cover .lesson-row-cover{opacity:1}
.lesson-row-visual.has-cover .lesson-row-grade{display:none}
.lesson-row-copy{min-width:0}
.lesson-row-titleline{display:flex;align-items:flex-start;justify-content:space-between;gap:8px}
.lesson-row-copy strong{min-width:0;display:block;font-family:var(--font-wen);font-size:20px;font-weight:600;letter-spacing:.06em}
.lesson-row-status{display:inline-block;flex:0 0 auto;margin-top:2px;padding:2px 7px;border:1px solid var(--rule);border-radius:10px;color:var(--cinnabar);font-size:9px;line-height:1.4;white-space:nowrap}
.lesson-row-copy small{display:block;margin-top:6px;color:var(--ink-soft);font-size:10px;line-height:1.5}
.lesson-row-copy p{display:-webkit-box;margin:7px 0 0;overflow:hidden;color:var(--ink-soft);font-size:12px;line-height:1.65;-webkit-line-clamp:2;-webkit-box-orient:vertical}
.lesson-row-arrow{align-self:center;color:var(--cinnabar);font-size:20px}
.lesson-row:active{background:rgba(237,228,208,.45)}
.lesson-empty,.lesson-detail-state{padding:62px 12px;text-align:center;color:var(--ink-soft)}
.lesson-empty>span,.lesson-loading-mark{width:58px;height:58px;display:grid;place-items:center;margin:0 auto 18px;border:1px solid var(--rule);border-radius:50%;color:var(--cinnabar);font-family:var(--font-wen);font-size:23px}
.lesson-empty h2,.lesson-detail-state h2{margin:0;color:var(--ink);font-family:var(--font-wen);font-size:21px}
.lesson-empty p,.lesson-detail-state p{margin:9px 0 0;font-size:12px;line-height:1.7}
.lesson-empty button{margin-top:17px;color:var(--cinnabar);font-size:12px;text-decoration:underline;text-underline-offset:4px}

.lesson-detail-main{padding-top:0}
.lesson-detail-header .page-heading h1{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.lesson-title-block{position:relative;width:100%;padding:31px 2px 29px;overflow:hidden;border-bottom:1px solid var(--rule);text-align:center}
.lesson-title-cover{position:absolute;z-index:0;inset:0;display:block;width:100%;height:100%;object-fit:cover;object-position:center}
.lesson-title-block.has-cover{width:calc(100% + 44px);min-height:250px;aspect-ratio:3/2;display:block;margin-right:-22px;margin-left:-22px;padding:0;text-align:left}
.lesson-title-block.has-cover:after{position:absolute;z-index:1;inset:0;background:linear-gradient(135deg,rgba(24,18,10,.38) 0%,rgba(24,18,10,.08) 48%,rgba(24,18,10,0) 72%);content:""}
.lesson-title-copy{position:relative;z-index:2;width:100%}
.lesson-title-block.has-cover .lesson-title-copy{position:absolute;inset:0;padding:18px 16px}
.lesson-title-block.has-cover .lesson-title-meta{max-width:82%;color:#fffaf0;text-shadow:0 1px 3px rgba(0,0,0,.88),0 3px 14px rgba(0,0,0,.76)}
.lesson-preparing{display:grid;grid-template-columns:46px minmax(0,1fr);gap:14px;align-items:start;margin:28px 0 2px;padding:19px 0;border-top:1px solid var(--ink);border-bottom:1px solid var(--rule)}
.lesson-preparing[hidden]{display:none}
.lesson-preparing>span{width:42px;height:42px;display:grid;place-items:center;border:1px solid var(--rule);border-radius:50%;color:var(--cinnabar);font-family:var(--font-wen);font-size:17px}
.lesson-preparing h2{margin:0;font-family:var(--font-wen);font-size:19px;font-weight:500;letter-spacing:.05em}
.lesson-preparing p{margin:7px 0 0;color:var(--ink-soft);font-size:12px;line-height:1.75}
.lesson-title-block h2{margin:11px 0 0;font-family:var(--font-wen);font-size:31px;font-weight:600;letter-spacing:.1em}
.lesson-byline{margin:11px 0 0;color:var(--ink-soft);font-size:11px}
.lesson-lead{margin:24px 0 0;padding:17px 0 0;border-top:1px solid rgba(216,203,178,.68);color:var(--ink-soft);font-family:var(--font-wen);font-size:14px;line-height:1.9;text-align:left}
.lesson-title-block.has-cover h2,.lesson-title-block.has-cover .lesson-byline{color:#fffaf0}
.lesson-title-block.has-cover h2{margin-top:8px;font-size:30px}
.lesson-title-block.has-cover .lesson-byline{margin-top:8px}
.lesson-title-block.has-cover .lesson-lead{position:absolute;right:14px;bottom:14px;width:min(78%,280px);margin:0;padding:10px 12px;border:0;border-radius:8px;background:rgba(17,14,10,.62);color:#fffaf0;font-size:13px;line-height:1.7;text-shadow:0 1px 2px rgba(0,0,0,.72)}
.close-reading,.knowledge-overview,.lesson-mindmap{padding:30px 0 4px}
.lesson-section-heading{margin-bottom:15px}
.lesson-section-heading h2{margin:0;font-family:var(--font-wen);font-size:23px;font-weight:500;letter-spacing:.08em}
.sentence-list{border-top:1px solid var(--ink)}
.sentence-item{border-bottom:1px solid var(--rule)}
.sentence-trigger{width:100%;display:grid;grid-template-columns:25px 1fr;gap:11px;padding:18px 2px;text-align:left}
.sentence-index{color:var(--cinnabar);font-family:var(--font-wen);font-size:12px}
.sentence-original{font-family:var(--font-wen);font-size:17px;line-height:1.9}
.sentence-trigger[aria-expanded="true"] .sentence-original{color:var(--cinnabar)}
.sentence-panel{margin:0 0 17px 36px;padding:12px 14px;border-left:2px solid var(--cinnabar);background:rgba(237,228,208,.48)}
.sentence-panel h3{margin:0 0 5px;color:var(--ink-soft);font-size:10px;font-weight:500;letter-spacing:.1em}
.sentence-panel p{margin:0;font-size:13px;line-height:1.8}
.sentence-points{margin:13px 0 0;padding:12px 0 0;border-top:1px solid var(--rule)}
.sentence-point{margin-top:10px}
.sentence-point:first-child{margin-top:0}
.sentence-point strong{display:block;color:var(--indigo);font-size:12px}
.sentence-point span{display:block;margin-top:3px;color:var(--ink-soft);font-size:12px;line-height:1.7}
.lesson-overview{margin-top:25px;border-top:1px solid var(--ink);border-bottom:1px solid var(--rule)}
.lesson-overview summary{padding:17px 2px;cursor:pointer;color:var(--cinnabar);font-family:var(--font-wen);font-size:16px;letter-spacing:.08em}
.lesson-prose{padding:0 2px 20px;color:var(--ink-soft);font-family:var(--font-wen);font-size:15px;line-height:2;white-space:pre-wrap}
.knowledge-group{padding:17px 0;border-top:1px solid var(--rule)}
.knowledge-group h3{margin:0 0 11px;color:var(--indigo);font-family:var(--font-wen);font-size:16px}
.knowledge-item{margin-top:14px}
.knowledge-item:first-of-type{margin-top:0}
.knowledge-item strong{font-size:13px}
.knowledge-item p{margin:5px 0 0;color:var(--ink-soft);font-size:12px;line-height:1.8;white-space:pre-wrap}
.lesson-quiz-entry{padding:25px 0 4px;border-top:1px solid var(--rule)}
.lesson-quiz-entry>button{display:flex;width:100%;align-items:center;justify-content:space-between;padding:18px 16px;border:1px solid rgba(160,55,43,.35);border-radius:12px;background:linear-gradient(135deg,rgba(255,252,244,.88),rgba(238,222,190,.55));color:var(--ink);text-align:left;box-shadow:0 8px 22px rgba(74,52,31,.07)}
.lesson-quiz-entry>button:focus-visible{outline:2px solid var(--red);outline-offset:3px}
.lesson-quiz-copy{display:grid;gap:5px}
.lesson-quiz-copy small{color:var(--red);font-size:11px;letter-spacing:.16em}
.lesson-quiz-copy strong{font-family:var(--font-wen);font-size:19px;font-weight:600}
.lesson-quiz-copy em{color:var(--ink-soft);font-size:11px;font-style:normal}
.lesson-quiz-mark{display:grid;width:48px;height:48px;flex:0 0 48px;place-items:center;border-radius:50%;background:rgba(159,62,50,.12);color:var(--red);font-family:var(--font-wen);font-size:19px;transform-origin:center}
.lesson-quiz-entry.loading>button{cursor:wait;opacity:.68}
.lesson-quiz-entry>p{margin:8px 4px 0;color:var(--red);font-size:11px}
.lesson-mindmap[hidden]{display:none}.mindmap-stage{position:relative;overflow:hidden;border-top:1px solid var(--ink);border-bottom:1px solid var(--rule);background:rgba(253,250,242,.64);touch-action:pan-y}.mindmap-slides{min-height:120px}.mindmap-slide{margin:0}.mindmap-slide[hidden]{display:none}.mindmap-slide.active{animation:mindmap-reveal .24s ease-out both}.mindmap-slide img{display:block;width:100%;height:auto;max-height:none}.mindmap-arrow{position:absolute;z-index:2;top:50%;width:30px;height:30px;display:grid;place-items:center;border:1px solid rgba(255,255,255,.35);border-radius:18px;background:rgba(35,30,22,.32);color:#fff8ea;font-size:27px;line-height:1;transform:translateY(-50%);backdrop-filter:blur(2px)}.mindmap-arrow.previous{left:8px}.mindmap-arrow.next{right:8px}.mindmap-arrow[hidden]{display:none}.mindmap-meta{min-height:38px;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:9px 2px 0}.mindmap-meta>p{margin:0;color:var(--ink-soft);font-size:11px;line-height:1.6}.mindmap-dots{display:flex;flex:0 0 auto;gap:6px}.mindmap-dots button{width:7px;height:7px;padding:0;border:1px solid var(--cinnabar);border-radius:50%}.mindmap-dots button.active{background:var(--cinnabar)}@keyframes mindmap-reveal{from{opacity:.3}to{opacity:1}}
.lesson-neighbors{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:34px 0 12px;padding-top:17px;border-top:1px solid var(--ink)}
.lesson-neighbors a{min-width:0;padding:7px 0;text-decoration:none}
.lesson-neighbors a:last-child{text-align:right}
.lesson-neighbors small{display:block;color:var(--ink-soft);font-size:10px}
.lesson-neighbors strong{display:block;margin-top:4px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--cinnabar);font-family:var(--font-wen);font-size:15px}

@media(prefers-reduced-motion:no-preference){
  .lesson-title-block{animation:lesson-rise .36s ease-out both}
  .lesson-row{animation:lesson-rise .28s ease-out both;animation-delay:calc(var(--row-index,0) * 38ms)}
  .sentence-panel{animation:lesson-reveal .18s ease-out both}
  .lesson-quiz-entry:not(.loading) .lesson-quiz-mark{animation:lesson-quiz-breathe 2.2s ease-in-out infinite}
  .lesson-quiz-entry>button:hover .lesson-quiz-mark,.lesson-quiz-entry>button:focus-visible .lesson-quiz-mark{animation:none;transform:scale(1.08)}
  @keyframes lesson-rise{from{opacity:0;transform:translateY(10px)}}
  @keyframes lesson-reveal{from{opacity:0;transform:translateY(-5px)}}
  @keyframes lesson-quiz-breathe{0%,100%{transform:scale(1);box-shadow:0 0 0 0 rgba(151,59,48,.12)}50%{transform:scale(1.1);box-shadow:0 0 0 7px rgba(151,59,48,.06)}}
}
@media(prefers-reduced-motion:reduce){.mindmap-slide.active{animation:none}}
@media(max-width:359px){
  .lesson-main,.lesson-detail-main{padding-right:17px;padding-left:17px}
  .lesson-title-block h2{font-size:27px}
  .lesson-title-block.has-cover{width:calc(100% + 34px);min-height:236px;aspect-ratio:auto;margin-right:-17px;margin-left:-17px}
  .lesson-title-block.has-cover .lesson-title-copy{padding:14px}
  .lesson-title-block.has-cover .lesson-title-meta{max-width:92%}
  .lesson-title-block.has-cover .lesson-lead{right:12px;bottom:12px;width:min(82%,250px)}
  .sentence-original{font-size:16px}
}
.sentence-trigger{grid-template-columns:25px minmax(0,1fr) 34px}
.sentence-text-trigger{min-width:0;padding:0;color:inherit;text-align:left}
.sentence-text-trigger[aria-expanded="true"] .sentence-original{color:var(--cinnabar)}
.sentence-audio{width:32px;height:32px;align-self:center;display:grid;place-items:center;border:1px solid rgba(151,59,48,.35);border-radius:50%;background:rgba(255,255,255,.5);color:var(--cinnabar);font-size:13px}
.sentence-audio[hidden]{display:none}
.sentence-audio.loading{color:transparent}
.sentence-audio.loading:after{width:12px;height:12px;border:2px solid rgba(151,59,48,.25);border-top-color:var(--cinnabar);border-radius:50%;content:"";animation:lesson-spin .7s linear infinite}
.sentence-audio.playing{background:var(--cinnabar);color:#fff;box-shadow:0 0 0 4px rgba(151,59,48,.12);animation:lesson-pulse 1.2s ease-in-out infinite}
.lesson-lecture{margin:20px 0 12px;border-top:1px solid var(--ink);border-bottom:1px solid var(--rule)}
.lesson-lecture[hidden]{display:none}
.lesson-lecture summary{display:grid;grid-template-columns:38px 1fr auto;align-items:center;gap:10px;padding:14px 2px;cursor:pointer;list-style:none}
.lesson-lecture summary::-webkit-details-marker{display:none}
.lecture-mark{width:32px;height:32px;display:grid;place-items:center;border:1px solid var(--cinnabar);border-radius:50%;color:var(--cinnabar);font-family:var(--font-wen)}
.lesson-lecture summary span:nth-child(2){display:flex;flex-direction:column;gap:2px}
.lesson-lecture summary small{color:var(--cinnabar);font-size:10px;letter-spacing:.12em}
.lesson-lecture summary strong{font-family:var(--font-wen);font-size:18px;font-weight:500}
.lecture-access{padding:3px 7px;border:1px solid rgba(151,59,48,.35);border-radius:10px;color:var(--cinnabar);font-size:9px}
.lecture-player{display:grid;grid-template-columns:44px 1fr;align-items:center;gap:12px;padding:2px 2px 16px}
.lecture-play{width:42px;height:42px;border:0;border-radius:50%;background:var(--cinnabar);color:#fff;font-size:16px}
.lecture-play.loading{position:relative;color:transparent}
.lecture-play.loading:after{position:absolute;inset:13px;border:2px solid rgba(255,255,255,.35);border-top-color:#fff;border-radius:50%;content:"";animation:lesson-spin .7s linear infinite}
.lecture-progress p{margin:0 0 7px;color:var(--ink-soft);font-size:11px}
.lecture-progress input{width:100%;accent-color:var(--cinnabar)}
.lecture-progress>div{display:flex;justify-content:space-between;color:var(--ink-soft);font-size:9px}
.lesson-access-dialog{width:min(340px,calc(100% - 32px));border:1px solid var(--rule);border-radius:14px;padding:28px 24px 22px;background:var(--paper);color:var(--ink);text-align:center;box-shadow:0 18px 50px rgba(25,20,13,.28)}
.lesson-access-dialog::backdrop{background:rgba(28,24,18,.48);backdrop-filter:blur(2px)}
.access-dialog-close{position:absolute;top:8px;right:10px;border:0;background:none;color:var(--ink-soft);font-size:24px}
.access-dialog-mark{width:48px;height:48px;display:grid;place-items:center;margin:0 auto 12px;border:1px solid var(--cinnabar);border-radius:50%;color:var(--cinnabar);font-family:var(--font-wen);font-size:20px}
.lesson-access-dialog h2{margin:0;font-family:var(--font-wen);font-size:23px;font-weight:500}
.lesson-access-dialog p{margin:10px 0 20px;color:var(--ink-soft);font-size:13px;line-height:1.7}
.access-dialog-actions{display:flex;justify-content:center;gap:10px}
.access-dialog-actions button,.access-dialog-actions a{min-width:105px;padding:9px 12px;border:1px solid var(--rule);border-radius:6px;background:#fff;color:var(--ink);font-size:12px;text-decoration:none}
.access-dialog-actions .primary{border-color:var(--cinnabar);background:var(--cinnabar);color:#fff}
.mindmap-lock{width:100%;min-height:340px;display:grid;place-items:center;padding:28px;border:0;background:linear-gradient(145deg,rgba(151,59,48,.1),rgba(255,255,255,.66));text-align:center}
.mindmap-lock span{width:52px;height:52px;display:grid;place-items:center;margin:0 auto 12px;border:1px solid var(--cinnabar);border-radius:50%;color:var(--cinnabar);font-family:var(--font-wen);font-size:19px}
.mindmap-lock strong{display:block;font-family:var(--font-wen);font-size:22px;font-weight:500}
.mindmap-lock small{display:block;margin-top:8px;color:var(--ink-soft);font-size:11px}
.mindmap-slide.loading .mindmap-lock span{font-size:0}
.mindmap-slide.loading .mindmap-lock span:after{width:18px;height:18px;border:2px solid rgba(151,59,48,.25);border-top-color:var(--cinnabar);border-radius:50%;content:"";animation:lesson-spin .7s linear infinite}
@keyframes lesson-spin{to{transform:rotate(360deg)}}
@keyframes lesson-pulse{50%{box-shadow:0 0 0 7px rgba(151,59,48,.05)}}
@media(prefers-reduced-motion:reduce){.sentence-audio.playing{animation:none}}