:root{--bg:#fafaf8;--surface:#fff;--ink:#1f2933;--slate:#52606d;--line:#e1e4e8;--accent:#0194aa;--accent-ink:#016b7b;--accent-soft:#e6f4f6;--ok:#1f7a4a;--bad:#b42318;color:var(--ink);background:var(--bg);font-synthesis:none;font-family:Atkinson Hyperlegible,system-ui,sans-serif;line-height:1.5}*{box-sizing:border-box}html,body{min-width:320px;min-height:100%;margin:0}button,input,select{font:inherit;color:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.45}:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:6px}h1,h2{letter-spacing:-.01em;font-family:Lora,Georgia,serif;font-weight:600}.eyebrow{color:var(--accent-ink);letter-spacing:.08em;text-transform:uppercase;margin:0 0 8px;font-size:13px;font-weight:700}.muted{color:var(--slate)}.library{max-width:820px;margin:0 auto;padding:clamp(32px,7vh,80px) 20px 64px}.library-head h1{margin:0 0 12px;font-size:clamp(34px,5vw,52px);line-height:1.1}.lede{color:var(--slate);max-width:60ch;margin:0 0 32px;font-size:18px}.chapter-list{border-top:1px solid var(--line);margin:0;padding:0;list-style:none}.chapter-row{border:0;border-bottom:1px solid var(--line);text-align:left;background:0 0;grid-template-columns:40px 1fr auto 18px;align-items:center;gap:14px;width:100%;padding:14px 8px;display:grid}.chapter-row:hover{background:var(--surface)}.chapter-no{color:var(--slate);font-variant-numeric:tabular-nums;font-weight:700}.chapter-title{font-size:18px}.status{border:1px solid var(--line);color:var(--slate);white-space:nowrap;border-radius:999px;padding:3px 10px;font-size:13px}.status.sample{border-color:var(--accent);color:var(--accent-ink);background:var(--accent-soft);font-weight:700}.player{grid-template-rows:auto 1fr;grid-template-columns:minmax(0,1fr);min-height:100vh;display:grid}.player.has-sidebar{grid-template-columns:300px 1fr}.player-head{z-index:20;background:var(--surface);border-bottom:1px solid var(--line);grid-column:1/-1;align-items:center;gap:12px;padding:10px 16px 14px;display:flex;position:sticky;top:0}.head-title{flex:1;min-width:0}.head-title p{color:var(--slate);margin:0;font-size:13px}.head-title strong{text-overflow:ellipsis;white-space:nowrap;font-size:17px;display:block;overflow:hidden}.head-step{color:var(--slate);flex-direction:column;align-items:flex-end;font-size:13px;display:flex}.head-step span:first-child{color:var(--ink);font-weight:700}.progress{background:var(--line);height:3px;position:absolute;bottom:0;left:0;right:0}.progress span{background:var(--accent);height:100%;transition:width .2s;display:block}.icon-btn{border:1px solid var(--line);background:var(--surface);border-radius:8px;flex:none;place-items:center;width:40px;height:40px;display:inline-grid}.icon-btn:hover,.text-btn:hover,.nav-btn:hover:not(:disabled){border-color:var(--accent)}.icon-btn.sm{width:34px;height:34px}.text-btn{border:1px solid var(--line);background:var(--surface);border-radius:8px;height:40px;padding:0 14px;font-weight:700}.sidebar{background:var(--surface);border-right:1px solid var(--line);grid-row:2;height:calc(100vh - 65px);padding:18px 14px;position:sticky;top:65px;overflow-y:auto}.sidebar[hidden]{display:none}.sidebar-top{justify-content:space-between;align-items:center;margin-bottom:6px;display:flex}.sidebar-top label{font-size:14px;font-weight:700}.sidebar select{border:1px solid var(--line);background:var(--surface);border-radius:8px;width:100%;padding:9px 10px}.sidebar-note{color:var(--slate);margin:16px 2px 8px;font-size:13px}.lesson-list{margin:0;padding:0;list-style:none}.lesson-list button{text-align:left;background:0 0;border:0;border-radius:8px;gap:10px;width:100%;padding:10px;font-size:15px;display:flex}.lesson-list button span{color:var(--slate);font-variant-numeric:tabular-nums}.lesson-list button:hover{background:var(--bg)}.lesson-list button.is-current{background:var(--accent-soft);color:var(--accent-ink);font-weight:700}.scrim{display:none}.stage{flex-direction:column;grid-row:2;min-width:0;padding:clamp(24px,5vh,56px) clamp(18px,5vw,72px) 24px;display:flex}.player.is-focus .stage{padding-inline:clamp(18px,8vw,140px)}.sample-flag{border:1px dashed var(--accent);color:var(--accent-ink);border-radius:6px;align-self:flex-start;margin:0 0 16px;padding:4px 10px;font-size:13px}.step{flex:1;width:100%;max-width:920px;margin:0 auto}.player.is-focus .step{max-width:1100px}.instruction{color:var(--slate);margin:0 0 20px;font-size:18px}.awaiting{border:1px dashed var(--line);color:var(--slate);border-radius:10px;padding:20px;font-size:18px}.prompts{margin:0 0 24px;padding-left:1.2em;font-size:clamp(22px,2.6vw,32px);line-height:1.35}.prompts li+li{margin-top:14px}.big{margin:0 0 6px;font-size:24px;font-weight:700}.passage{border:1px solid var(--line);background:var(--surface);border-radius:10px;max-height:58vh;padding:22px 26px;font-family:Lora,Georgia,serif;font-size:clamp(19px,1.8vw,23px);line-height:1.7;overflow-y:auto}.passage p{margin:0 0 1em}.audio{align-items:center;gap:12px;margin-bottom:16px;display:flex}.audio input{accent-color:var(--accent);flex:1}.reveal{margin-top:20px}.reveal-btn{border:1px solid var(--accent);background:var(--surface);color:var(--accent-ink);border-radius:8px;padding:8px 16px;font-weight:700}.reveal-body{border-left:3px solid var(--accent);background:var(--accent-soft);margin-top:12px;padding:16px 20px;font-size:19px}.reveal-body p{margin:0 0 6px}.disclosures{gap:10px;display:grid}.disclosures details{border:1px solid var(--line);background:var(--surface);border-radius:10px}.disclosures summary{cursor:pointer;padding:14px 18px;font-size:clamp(19px,2vw,24px);font-weight:700}.disclosures details p{margin:0;padding:0 18px 12px;font-size:18px}.verdict{text-transform:capitalize;color:var(--bad)}.chunks{gap:10px;margin:0;padding:0;list-style:none;display:grid}.chunks li{border:1px solid var(--line);border-left:3px solid var(--accent);background:var(--surface);border-radius:8px;padding:14px 18px;font-size:clamp(20px,2.2vw,26px)}.challenges li{margin-bottom:18px;font-size:20px}.choice{border:0;gap:8px;margin:0 0 20px;padding:0;display:grid}.choice legend{margin-bottom:10px;font-size:22px;font-weight:700}.choice>button:not(.reveal-btn),.word-bank button{border:1px solid var(--line);background:var(--surface);text-align:left;border-radius:8px;padding:10px 14px;font-size:18px}.is-picked{border-color:var(--accent)!important;background:var(--accent-soft)!important}.is-correct{color:var(--ok);border-color:var(--ok)!important}.is-wrong{color:var(--bad);border-color:var(--bad)!important}.word-bank{flex-wrap:wrap;gap:8px;margin-bottom:20px;display:flex}.gap-list{margin:0;padding-left:1.4em;font-size:clamp(19px,2vw,24px);line-height:1.9}.gap{border:0;border-bottom:2px solid var(--accent);background:var(--accent-soft);border-radius:4px;min-width:110px;margin:0 4px;padding:0 10px;font-weight:700}.gap-actions{align-items:center;gap:14px;margin-top:20px;font-weight:700;display:flex}.step-nav{border-top:1px solid var(--line);justify-content:space-between;align-items:center;gap:12px;width:100%;max-width:920px;margin:32px auto 0;padding-top:16px;display:flex}.player.is-focus .step-nav{max-width:1100px}.nav-btn{border:1px solid var(--line);background:var(--surface);white-space:nowrap;border-radius:8px;align-items:center;gap:6px;height:44px;padding:0 16px;font-weight:700;display:inline-flex}.nav-btn.primary{border-color:var(--accent);background:var(--accent);color:#fff}.step-dots{flex-wrap:wrap;justify-content:center;gap:4px;margin:0;padding:0;list-style:none;display:flex}.step-dots button{border:1px solid var(--line);background:var(--surface);width:26px;height:26px;color:var(--slate);border-radius:50%;padding:0;font-size:11px;font-weight:700}.step-dots button.is-done{border-color:var(--accent);color:var(--accent-ink)}.step-dots button.is-current{border-color:var(--accent);background:var(--accent);color:#fff}.empty-state{max-width:640px;margin:8vh auto 0}.empty-state h1{margin:0 0 12px;font-size:clamp(30px,4vw,42px)}.empty-state>p:not(.eyebrow){color:var(--slate);font-size:18px}.empty-actions{flex-wrap:wrap;gap:10px;margin-top:20px;display:flex}@media(max-width:899px){.player.has-sidebar{grid-template-columns:minmax(0,1fr)}.player-head{gap:8px;padding:8px 10px 12px}.head-title p{white-space:nowrap;text-overflow:ellipsis;overflow:hidden}.text-btn{padding:0 10px}.audio .muted{font-size:13px}.sidebar{z-index:40;width:min(320px,86vw);height:100vh;position:fixed;inset:0 auto 0 0;box-shadow:0 0 40px #00000026}.scrim{z-index:30;background:#1f293359;display:block;position:fixed;inset:0}.head-step .step-name{display:none}.step-nav{flex-wrap:wrap}.step-dots{order:-1;width:100%}.step-dots button{width:22px;height:22px;font-size:10px}.chapter-row{grid-template-columns:32px 1fr 18px}.chapter-row .status{grid-column:2;justify-self:start}.chapter-row svg{grid-area:1/3}}.status.imported{border-color:var(--accent);color:var(--accent-ink);background:var(--accent-soft);font-weight:700}.notion-slide-heading{margin:0 0 24px;font-size:clamp(28px,3vw,40px);line-height:1.16}.notion-prose{overflow-wrap:anywhere;font-size:clamp(18px,1.75vw,23px);line-height:1.55}.notion-prose p{margin:0 0 18px}.notion-prose h3{margin:20px 0 12px;font-family:inherit;font-size:1.08em;font-weight:750}.notion-prose ul,.notion-prose ol{margin:0 0 20px;padding-left:1.35em}.notion-prose li{margin-bottom:9px}.notion-prose code{background:var(--accent-soft);border-radius:4px;padding:0 4px}.notion-choices{gap:10px;margin:12px 0 24px;display:grid}.notion-choices button{background:var(--surface);border:1px solid var(--line);text-align:left;width:100%;font-size:inherit;line-height:inherit;border-radius:9px;padding:12px 16px}.notion-choices button:hover{border-color:var(--accent)}.notion-answer{border-top:1px solid var(--line);margin-top:28px;padding-top:18px}.notion-answer .reveal-body{max-height:55vh;overflow-y:auto}.notion-answer .reveal-body .notion-prose{font-size:clamp(16px,1.4vw,20px)}.notion-answer .reveal-body .notion-prose p{margin-bottom:10px}@media(max-width:899px){.notion-slide-heading{font-size:27px}.notion-prose{font-size:19px}.notion-choices button{padding:11px 12px}}.notion-matching{border:1px solid var(--line);background:var(--bg);border-radius:12px;margin:18px 0 28px;padding:18px}.notion-matching-help{color:var(--slate);font-size:.82em;margin:0 0 16px!important}.notion-matching-columns{grid-template-columns:minmax(0,1fr) minmax(0,1fr);align-items:start;gap:14px;display:grid}.notion-matching-column{gap:9px;min-width:0;display:grid}.notion-matching-caption{color:var(--slate);letter-spacing:.06em;text-transform:uppercase;font-size:13px;font-weight:800;margin:0 0 3px!important}.notion-match-card{border:1.5px solid var(--line);background:var(--surface);text-align:left;border-radius:9px;align-items:center;gap:10px;width:100%;min-height:64px;padding:12px;font-size:.84em;line-height:1.4;transition:border-color .12s,background .12s;display:flex}.notion-match-card:hover{border-color:var(--accent)}.notion-match-card.is-active{border-color:var(--accent);background:var(--accent-soft);box-shadow:0 0 0 1px var(--accent)}.notion-match-card.is-correct{border-color:var(--ok);background:#eef8f1}.notion-match-card.is-wrong{border-color:var(--bad);background:#fff3f2}.notion-match-label{background:var(--accent-soft);min-width:30px;height:30px;color:var(--accent-ink);border-radius:6px;flex:none;place-items:center;padding:0 5px;font-size:14px;font-weight:800;display:inline-grid}.notion-match-text{flex:1;min-width:0}.notion-match-pair{background:var(--ink);color:#fff;border-radius:50%;flex:none;place-items:center;min-width:28px;height:28px;padding:0 5px;font-size:12px;font-weight:800;display:inline-grid}.notion-matching-actions{flex-wrap:wrap;align-items:center;gap:10px;margin-top:18px;display:flex}.notion-matching-progress{color:var(--slate);font-variant-numeric:tabular-nums;margin-right:auto;font-size:15px;font-weight:700}.notion-matching-result{font-size:.86em;font-weight:700;margin:14px 0 0!important}@media(max-width:640px){.notion-matching{padding:12px}.notion-matching-columns{grid-template-columns:1fr;gap:18px}.notion-match-card{min-height:54px;padding:10px}}.summary-vocab-slide{font-size:clamp(18px,1.75vw,22px);line-height:1.55}.summary-vocab-intro{color:var(--slate);margin:0 0 22px}.summary-vocab-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:0;display:grid}.summary-vocab-card{border:1px solid var(--line);background:var(--surface);border-radius:12px;margin:0;padding:18px 20px}.summary-vocab-card dt{align-items:center;gap:10px;font-size:1.05em;font-weight:800;display:flex}.summary-vocab-number{background:var(--accent-soft);width:30px;height:30px;color:var(--accent-ink);border-radius:6px;flex:none;place-items:center;font-size:14px;display:inline-grid}.summary-vocab-card dd{margin-left:40px}.summary-definition{margin-top:8px}.summary-example{color:var(--slate);margin-top:8px;font-size:.88em;font-style:italic}.summary-chunks{margin-top:28px}.summary-chunks h3{margin-bottom:10px;font-size:1em}.summary-chunks ul{flex-wrap:wrap;gap:8px;padding:0;list-style:none;display:flex}.summary-chunks li{background:var(--accent-soft);color:var(--accent-ink);border-radius:8px;padding:6px 11px}@media(max-width:680px){.summary-vocab-grid{grid-template-columns:1fr}.summary-vocab-card{padding:14px 16px}}