:root{--font-scale:1;font-size:calc(16px * var(--font-scale, 1));--ink:#1d2926;--muted:#66736f;--paper:#f4f6f3;--surface:#fff;--line:#dce4df;--brand:#183d38;--brand2:#2f6f61;--accent:#d3a44b;--soft:#e7f0eb;--warn:#fff2d9;--danger:#a43c38;--shadow:0 8px 28px rgba(23,48,42,.08);font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;color:var(--ink)}
*{box-sizing:border-box}body{margin:0;background:var(--paper);min-height:100vh}button,input,select,textarea{font:inherit}button{cursor:pointer}.topbar{position:sticky;top:0;z-index:20;display:flex;justify-content:space-between;align-items:center;gap:12px;padding:12px max(16px,calc((100vw - 1120px)/2));background:rgba(24,61,56,.97);color:#fff;box-shadow:0 3px 16px rgba(0,0,0,.12)}.brand{display:flex;align-items:center;gap:10px;min-width:0}.brand-mark{width:38px;height:38px;border-radius:12px;background:#e2b65e;color:#183d38;display:grid;place-items:center;font-weight:900;font-size:calc(22px * var(--font-scale, 1));flex:none}.brand-title{font-weight:750;font-size:calc(14px * var(--font-scale, 1));line-height:1.2}.brand-subtitle{font-size:calc(11px * var(--font-scale, 1));opacity:.76;margin-top:3px}.top-actions{display:flex;align-items:center;gap:8px}.font-controls{display:flex;align-items:center;gap:4px;padding:3px 5px;border:1px solid rgba(255,255,255,.24);border-radius:10px;background:rgba(255,255,255,.08);white-space:nowrap}.font-label{font-size:calc(10px * var(--font-scale, 1));color:#e4eee9;margin:0 3px}.font-size-btn{min-width:32px;height:30px;padding:3px 6px;border:1px solid rgba(255,255,255,.28);border-radius:7px;background:#fff;color:var(--brand);font-size:calc(13px * var(--font-scale, 1));font-weight:800;line-height:1}.font-size-btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.font-size-btn:disabled{opacity:.45;cursor:not-allowed}.font-scale-status{min-width:35px;text-align:center;color:#fff;font-size:calc(10px * var(--font-scale, 1));font-variant-numeric:tabular-nums}.font-reset-btn{min-width:29px;background:#f4dfb7;color:#243a33}.status-pill{font-size:calc(11px * var(--font-scale, 1));padding:6px 9px;border:1px solid rgba(255,255,255,.24);border-radius:100px;color:#e4eee9;white-space:nowrap}.icon-button{background:#f4dfb7;border:0;border-radius:8px;padding:8px 10px;color:#243a33;font-weight:700;font-size:calc(12px * var(--font-scale, 1))}.app-shell{max-width:1120px;margin:0 auto;padding:24px 18px 108px;min-height:calc(100vh - 64px)}.bottom-nav{position:fixed;z-index:30;bottom:0;left:0;right:0;display:flex;justify-content:center;gap:4px;padding:8px max(8px,calc((100vw - 760px)/2)) calc(8px + env(safe-area-inset-bottom));background:rgba(255,255,255,.97);border-top:1px solid var(--line);backdrop-filter:blur(14px)}.nav-item{flex:1;max-width:120px;display:flex;flex-direction:column;align-items:center;gap:3px;border:0;background:transparent;color:#73807a;padding:5px 2px;border-radius:10px;font-size:calc(10px * var(--font-scale, 1));font-weight:650}.nav-item.active{color:var(--brand);background:var(--soft)}.nav-icon{font-size:calc(19px * var(--font-scale, 1));line-height:1.1}.page-head{margin-bottom:18px}.eyebrow{font-size:calc(11px * var(--font-scale, 1));letter-spacing:.11em;text-transform:uppercase;color:var(--brand2);font-weight:800}.page-head h1{font-size:clamp(calc(24px * var(--font-scale, 1)),calc(4vw * var(--font-scale, 1)),calc(34px * var(--font-scale, 1)));line-height:1.13;margin:5px 0 8px;color:var(--brand)}.page-head p{margin:0;max-width:760px;color:var(--muted);line-height:1.55;font-size:calc(14px * var(--font-scale, 1))}.hero{background:linear-gradient(125deg,#183d38,#2a6456);color:#fff;border-radius:24px;padding:26px;display:grid;grid-template-columns:1.5fr .8fr;gap:20px;box-shadow:var(--shadow);overflow:hidden;position:relative}.hero:after{content:"";position:absolute;width:280px;height:280px;border:1px solid rgba(255,255,255,.12);border-radius:50%;right:-70px;top:-120px;box-shadow:0 0 0 26px rgba(255,255,255,.035),0 0 0 54px rgba(255,255,255,.025)}.hero h1{font-size:clamp(calc(27px * var(--font-scale, 1)),calc(4.5vw * var(--font-scale, 1)),calc(42px * var(--font-scale, 1)));line-height:1.1;margin:8px 0 12px;max-width:680px}.hero p{color:#d6e6df;line-height:1.6;max-width:680px;font-size:calc(14px * var(--font-scale, 1))}.hero .eyebrow{color:#f0c76f}.hero-side{z-index:1;align-self:center;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.14);border-radius:18px;padding:16px}.hero-side strong{display:block;font-size:calc(31px * var(--font-scale, 1))}.hero-side span{font-size:calc(12px * var(--font-scale, 1));color:#d6e6df}.button-row{display:flex;gap:9px;flex-wrap:wrap;margin-top:18px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 15px;border:1px solid transparent;border-radius:11px;font-size:calc(13px * var(--font-scale, 1));font-weight:750;text-decoration:none;transition:.15s}.btn-primary{background:var(--accent);color:#203c34}.btn-secondary{background:#fff;color:var(--brand);border-color:var(--line)}.btn-dark{background:var(--brand);color:#fff}.btn-outline{background:transparent;border-color:#aabbb3;color:var(--brand)}.btn-small{padding:7px 10px;font-size:calc(11px * var(--font-scale, 1));border-radius:8px}.btn:disabled{opacity:.45;cursor:not-allowed}.grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:14px;margin-top:16px}.span-12{grid-column:span 12}.span-8{grid-column:span 8}.span-7{grid-column:span 7}.span-6{grid-column:span 6}.span-5{grid-column:span 5}.span-4{grid-column:span 4}.card{background:var(--surface);border:1px solid var(--line);border-radius:17px;padding:18px;box-shadow:0 3px 12px rgba(28,58,50,.035)}.card h2,.card h3{color:var(--brand);margin:0 0 8px}.card h2{font-size:calc(18px * var(--font-scale, 1))}.card h3{font-size:calc(15px * var(--font-scale, 1))}.card p{font-size:calc(13px * var(--font-scale, 1));line-height:1.6;color:var(--muted)}.card p:last-child{margin-bottom:0}.unit-card{position:relative;overflow:hidden}.unit-number{display:inline-grid;place-items:center;width:30px;height:30px;background:var(--soft);color:var(--brand);font-size:calc(13px * var(--font-scale, 1));font-weight:850;border-radius:9px;margin-bottom:11px}.unit-meta{font-size:calc(11px * var(--font-scale, 1));color:var(--muted);margin:10px 0}.progress-track{height:7px;border-radius:20px;background:#e8eeea;overflow:hidden}.progress-fill{height:100%;background:var(--brand2);border-radius:20px}.progress-label{display:flex;justify-content:space-between;font-size:calc(10px * var(--font-scale, 1));color:var(--muted);margin-top:6px}.stat-row{display:flex;gap:10px;flex-wrap:wrap}.stat{background:#f7f9f7;border:1px solid var(--line);border-radius:12px;padding:10px 12px;flex:1;min-width:90px}.stat strong{display:block;font-size:calc(22px * var(--font-scale, 1));color:var(--brand)}.stat span{font-size:calc(10px * var(--font-scale, 1));color:var(--muted)}.lesson-list{display:grid;gap:9px}.lesson-row{display:flex;align-items:center;gap:12px;padding:13px;border:1px solid var(--line);border-radius:13px;background:#fff}.lesson-row:hover{border-color:#9bb6aa}.lesson-index{width:34px;height:34px;flex:none;border-radius:10px;background:var(--soft);color:var(--brand);display:grid;place-items:center;font-weight:800;font-size:calc(12px * var(--font-scale, 1))}.lesson-info{min-width:0;flex:1}.lesson-info strong{display:block;font-size:calc(13px * var(--font-scale, 1));color:var(--brand)}.lesson-info span{font-size:calc(11px * var(--font-scale, 1));color:var(--muted)}.lesson-status{font-size:calc(10px * var(--font-scale, 1));color:var(--brand2);font-weight:800}.section-box{background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px;margin:13px 0}.section-box h3{color:var(--brand);margin:0 0 9px;font-size:calc(17px * var(--font-scale, 1))}.section-box p{font-size:calc(14px * var(--font-scale, 1));line-height:1.72;margin:0 0 10px;color:#3c4843}.section-box p:last-child{margin-bottom:0}.example-box{margin-top:12px;background:#f4f8f4;border-left:4px solid var(--brand2);padding:12px 14px;border-radius:0 11px 11px 0}.example-box strong{display:block;color:var(--brand);font-size:calc(12px * var(--font-scale, 1));margin-bottom:5px}.example-box p{font-size:calc(13px * var(--font-scale, 1));margin:0;line-height:1.6}.callout{background:#eaf2ed;border:1px solid #cbded1;border-radius:13px;padding:14px;margin:12px 0;color:#2f5147;font-size:calc(13px * var(--font-scale, 1));line-height:1.6}.warning-box{background:var(--warn);border:1px solid #edd69d;border-radius:13px;padding:14px;color:#674b13;font-size:calc(13px * var(--font-scale, 1));line-height:1.6;margin:12px 0}.key-list,.check-list{padding-left:20px;margin:8px 0}.key-list li,.check-list li{font-size:calc(13px * var(--font-scale, 1));line-height:1.55;margin:7px 0}.term-chip{display:inline-block;background:#edf3ee;color:#29564a;padding:4px 8px;border-radius:7px;font-size:calc(11px * var(--font-scale, 1));font-weight:700;margin:3px 4px 3px 0}.toolbar{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0}.input,.select,.textarea{width:100%;border:1px solid #cbd7d0;background:#fff;border-radius:11px;padding:11px 12px;font-size:calc(14px * var(--font-scale, 1));color:var(--ink);outline:none}.input:focus,.select:focus,.textarea:focus{border-color:var(--brand2);box-shadow:0 0 0 3px rgba(47,111,97,.12)}.textarea{min-height:110px;resize:vertical;line-height:1.5}.search-wrap{display:flex;gap:8px}.search-wrap .input{flex:1}.muted{color:var(--muted);font-size:calc(12px * var(--font-scale, 1));line-height:1.5}.source-ref{font-size:calc(11px * var(--font-scale, 1));color:var(--muted)}.tag{display:inline-block;font-size:calc(10px * var(--font-scale, 1));font-weight:800;padding:4px 8px;border-radius:100px;background:var(--soft);color:var(--brand2)}.tag.gold{background:#fbf1da;color:#75530c}.divider{height:1px;background:var(--line);margin:14px 0}.chat-answer{background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px;margin-top:14px}.chat-answer h3{color:var(--brand);margin:0 0 7px}.chat-answer p{font-size:calc(13px * var(--font-scale, 1));line-height:1.65;color:#3c4843}.source-result{border-top:1px solid var(--line);padding:11px 0}.source-result strong{font-size:calc(12px * var(--font-scale, 1));color:var(--brand)}.source-result p{font-size:calc(12px * var(--font-scale, 1));margin:5px 0;color:var(--muted);white-space:pre-wrap}.question-card{background:#fff;border:1px solid var(--line);border-radius:17px;padding:20px;margin-top:14px}.question-card h3{font-size:calc(17px * var(--font-scale, 1));line-height:1.4;color:var(--brand);margin:0 0 15px}.option{display:flex;gap:10px;align-items:flex-start;border:1px solid var(--line);border-radius:11px;padding:11px;margin:8px 0;cursor:pointer;font-size:calc(13px * var(--font-scale, 1));line-height:1.45}.option:hover{border-color:#8ea99e;background:#f8fbf8}.option input{margin-top:2px;accent-color:var(--brand2)}.option.correct{border-color:#83b49b;background:#eff8f1}.option.incorrect{border-color:#d9988d;background:#fff4f1}.feedback{padding:13px;border-radius:12px;margin-top:13px;font-size:calc(13px * var(--font-scale, 1));line-height:1.55}.feedback.good{background:#eaf5ed;color:#245c38}.feedback.bad{background:#fff1ed;color:#8c342c}.quiz-progress{display:flex;justify-content:space-between;font-size:calc(11px * var(--font-scale, 1));color:var(--muted)}.glossary-item{border-bottom:1px solid var(--line);padding:11px 0}.glossary-item strong{color:var(--brand);font-size:calc(13px * var(--font-scale, 1))}.glossary-item p{font-size:calc(12px * var(--font-scale, 1));margin:5px 0 0;line-height:1.5;color:var(--muted)}.tool-tabs{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}.tool-tab{border:1px solid var(--line);background:#fff;padding:8px 11px;border-radius:9px;font-size:calc(12px * var(--font-scale, 1));color:var(--brand);font-weight:700}.tool-tab.active{background:var(--brand);color:#fff}.result-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}.result-cell{background:#f4f8f5;border-radius:11px;padding:12px;text-align:center}.result-cell strong{display:block;color:var(--brand);font-size:calc(22px * var(--font-scale, 1))}.result-cell span{font-size:calc(10px * var(--font-scale, 1));color:var(--muted)}.slider-row{display:grid;grid-template-columns:1fr 58px;gap:8px;align-items:center;margin:12px 0}.slider-row label{font-size:calc(12px * var(--font-scale, 1));color:var(--muted)}.slider-row input{grid-column:1/-1;width:100%;accent-color:var(--brand2)}.slider-value{text-align:right;font-weight:800;color:var(--brand)}.bar-row{display:grid;grid-template-columns:92px 1fr 45px;gap:8px;align-items:center;margin:8px 0;font-size:calc(11px * var(--font-scale, 1))}.bar{height:12px;background:#e7eee9;border-radius:20px;overflow:hidden}.bar>i{display:block;height:100%;background:var(--brand2)}.book-frame{width:100%;height:68vh;min-height:420px;border:1px solid var(--line);border-radius:13px;background:#fff}.empty-state{padding:28px;text-align:center;color:var(--muted)}.empty-state strong{display:block;color:var(--brand);margin-bottom:6px}.toast{position:fixed;z-index:50;bottom:88px;left:50%;transform:translate(-50%,14px);padding:10px 15px;border-radius:10px;background:#1b302b;color:#fff;font-size:calc(12px * var(--font-scale, 1));opacity:0;pointer-events:none;transition:.2s;max-width:90vw}.toast.show{opacity:1;transform:translate(-50%,0)}.loading-panel{max-width:420px;margin:12vh auto;text-align:center;color:var(--muted)}.spinner{width:32px;height:32px;border:3px solid #d9e4dc;border-top-color:var(--brand2);border-radius:50%;animation:spin .8s linear infinite;margin:0 auto 16px}@keyframes spin{to{transform:rotate(360deg)}}.hidden{display:none!important}.small-note{font-size:calc(11px * var(--font-scale, 1));color:var(--muted);line-height:1.45}.footer-note{margin-top:20px;color:var(--muted);font-size:calc(10px * var(--font-scale, 1));line-height:1.5}.button-link{border:0;background:transparent;color:var(--brand2);font-weight:750;text-decoration:underline;font-size:calc(12px * var(--font-scale, 1));padding:4px}.module-nav{display:flex;justify-content:space-between;gap:10px;margin-top:18px}.book-shortcuts{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.book-shortcuts .btn{font-size:calc(11px * var(--font-scale, 1));padding:9px 6px}.check-card{display:flex;gap:10px;align-items:flex-start;padding:9px 0;border-bottom:1px solid var(--line);font-size:calc(13px * var(--font-scale, 1))}.check-card input{accent-color:var(--brand2);margin-top:3px}.history-item{padding:8px 0;border-bottom:1px solid var(--line);font-size:calc(12px * var(--font-scale, 1));color:var(--muted)}
@media(max-width:760px){.topbar{flex-wrap:wrap}.brand{width:100%}.top-actions{width:100%;justify-content:space-between;gap:6px;flex-wrap:wrap}.font-controls{gap:3px}.font-label{display:none}.app-shell{padding:17px 13px 105px}.hero{grid-template-columns:1fr;padding:21px}.hero-side{display:flex;align-items:center;gap:10px}.hero-side strong{font-size:calc(24px * var(--font-scale, 1))}.span-8,.span-7,.span-6,.span-5,.span-4{grid-column:span 12}.topbar{padding:10px 12px}.brand-title{font-size:calc(12px * var(--font-scale, 1))}.brand-subtitle{font-size:calc(10px * var(--font-scale, 1))}.status-pill{font-size:calc(10px * var(--font-scale, 1))}.book-frame{height:62vh;min-height:360px}.book-shortcuts{grid-template-columns:repeat(2,1fr)}.result-grid{grid-template-columns:repeat(3,1fr)}}
@media(min-width:761px){.bottom-nav{top:64px;bottom:auto;left:auto;right:max(16px,calc((100vw - 1120px)/2));width:auto;padding:5px;background:transparent;border:0}.nav-item{color:#dce8e2;max-width:76px;padding:7px}.nav-item.active{background:rgba(255,255,255,.18);color:#fff}.app-shell{padding-top:78px}}