:root{
  --bg:#f5f7fb;--panel:#fff;--panel2:#eef3f8;--text:#132437;--muted:#66788b;--line:#dce5ee;
  --navy:#0b2a4a;--blue:#1768a8;--blue2:#3b8fc8;--yellow:#f5c542;--good:#217a55;--bad:#b34646;
  --warm:#fff8e6;--mint:#eaf7f1;--radius:20px;--max:1120px;--reading:790px;
  --shadow:0 16px 42px rgba(18,49,78,.09);--shadow-sm:0 4px 15px rgba(18,49,78,.05)
}
html[data-theme="dark"]{
  --bg:#0f1822;--panel:#162330;--panel2:#1d2d3b;--text:#eef6fc;--muted:#9fb0c0;--line:#2a3b4b;
  --navy:#102f50;--blue:#5aa8db;--blue2:#81bee5;--yellow:#f5c542;--good:#61c795;--bad:#ef8585;
  --warm:#302b1d;--mint:#163329;--shadow:0 16px 42px rgba(0,0,0,.22);--shadow-sm:0 4px 15px rgba(0,0,0,.14)
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.58;-webkit-font-smoothing:antialiased}button,input,audio{font:inherit}.shell{width:min(calc(100% - 36px),var(--max));margin-inline:auto}.skip-link{position:fixed;z-index:100;top:8px;left:8px;transform:translateY(-150%);background:var(--panel);color:var(--text);padding:10px 14px;border-radius:10px}.skip-link:focus{transform:none}.topbar{position:sticky;top:0;z-index:30;background:color-mix(in srgb,var(--bg) 86%,transparent);backdrop-filter:blur(18px);border-bottom:1px solid color-mix(in srgb,var(--line) 78%,transparent)}.topbar__inner{height:72px;display:flex;align-items:center;gap:24px}.brand{display:flex;align-items:center;gap:11px;border:0;background:none;padding:0;color:var(--text);text-align:left;cursor:pointer}.brand img{border-radius:13px;box-shadow:0 5px 16px rgba(11,42,74,.18)}.brand strong{display:block;font-size:1.02rem;letter-spacing:-.025em}.brand strong span{color:var(--blue)}.brand small{display:block;color:var(--muted);font-size:.68rem;font-weight:700;margin-top:1px}.desktop-nav{display:flex;align-items:center;gap:3px;margin-left:auto}.desktop-nav button{border:0;background:none;color:var(--muted);padding:9px 11px;border-radius:10px;font-size:.82rem;font-weight:800;cursor:pointer}.desktop-nav button:hover,.desktop-nav button.active{color:var(--blue);background:var(--panel2)}.topbar__actions{display:flex;gap:7px}.icon-button{width:40px;height:40px;border-radius:12px;border:1px solid var(--line);background:var(--panel);color:var(--text);font-size:1.05rem;cursor:pointer}.icon-button:hover{box-shadow:var(--shadow-sm)}main{padding:34px 0 112px}.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-sm)}.eyebrow,.kicker{font-size:.71rem;text-transform:uppercase;letter-spacing:.12em;font-weight:900;color:var(--blue)}.hero{position:relative;overflow:hidden;border-radius:30px;padding:44px;background:linear-gradient(135deg,#0b2a4a,#145b96 70%,#2b83bd);color:#fff;box-shadow:0 24px 62px rgba(11,42,74,.22)}.hero:after{content:"";position:absolute;width:330px;height:330px;border-radius:50%;right:-120px;top:-170px;border:52px solid rgba(245,197,66,.14)}.hero__content{position:relative;z-index:1;max-width:700px}.hero .eyebrow{color:var(--yellow)}.hero h1{font-size:clamp(2.35rem,5.4vw,4.15rem);line-height:.99;max-width:760px;margin:8px 0 0;letter-spacing:-.06em}.hero p{font-size:1.05rem;color:#dcebf8;max-width:660px;margin:19px 0 26px}.actions{display:flex;flex-wrap:wrap;gap:10px}.actions--center{justify-content:center}.btn{appearance:none;border:0;border-radius:13px;padding:12px 16px;font-weight:850;font-size:.87rem;cursor:pointer;transition:.18s transform,.18s box-shadow,.18s background;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:5px}.btn:hover:not(:disabled){transform:translateY(-1px);box-shadow:var(--shadow-sm)}.btn:disabled{opacity:.45;cursor:not-allowed}.btn--primary{background:var(--yellow);color:#1d2a37}.btn--secondary{background:rgba(255,255,255,.11);border:1px solid rgba(255,255,255,.28);color:#fff}.btn--blue{background:var(--blue);color:#fff}.btn--ghost{background:var(--panel2);color:var(--text);border:1px solid var(--line)}.btn--done{background:var(--mint);color:var(--good);border:1px solid color-mix(in srgb,var(--good) 30%,var(--line))}.text-button{border:0;background:none;color:var(--blue);font-weight:850;cursor:pointer;padding:4px 0;text-decoration:none}.text-button:hover{text-decoration:underline}.hero__path{position:relative;z-index:1;display:flex;align-items:center;gap:12px;margin-top:35px;padding-top:25px;border-top:1px solid rgba(255,255,255,.18)}.hero__path div{display:grid;grid-template-columns:28px 1fr;column-gap:9px;align-items:center}.hero__path div>span{grid-row:1/3;width:28px;height:28px;display:grid;place-items:center;border-radius:50%;background:rgba(255,255,255,.13);font-size:.75rem;font-weight:900}.hero__path strong{font-size:.82rem}.hero__path small{font-size:.68rem;color:#cfe1f0}.hero__path i{font-style:normal;color:rgba(255,255,255,.4)}.dashboard-strip{display:grid;grid-template-columns:repeat(4,1fr);margin-top:17px;background:var(--panel);border:1px solid var(--line);border-radius:19px;overflow:hidden;box-shadow:var(--shadow-sm)}.dashboard-strip>div{padding:16px 19px;border-right:1px solid var(--line);display:flex;flex-direction:column}.dashboard-strip>div:last-child{border-right:0}.dashboard-strip .metric{font-size:1.45rem;line-height:1;font-weight:900;letter-spacing:-.04em}.dashboard-strip .metric small{font-size:.72rem;color:var(--muted);font-weight:800}.dashboard-strip>div>span:last-child{font-size:.72rem;color:var(--muted);margin-top:5px;font-weight:750}.section-head{display:flex;align-items:end;justify-content:space-between;gap:22px;margin:38px 0 15px}.section-head h2{font-size:1.45rem;margin:2px 0 0;letter-spacing:-.04em;line-height:1.16}.section-head p{margin:5px 0 0;color:var(--muted);font-size:.87rem;max-width:720px}.continue-card{display:grid;grid-template-columns:auto 1fr auto;gap:20px;align-items:center;padding:22px}.continue-card__icon{width:66px;height:66px;border-radius:19px;background:var(--panel2);display:grid;place-items:center;font-size:1.75rem}.continue-card h3{margin:7px 0 4px;font-size:1.22rem;letter-spacing:-.025em}.continue-card p{margin:0;color:var(--muted);font-size:.86rem}.status-row{display:flex;flex-wrap:wrap;gap:6px}.pill{display:inline-flex;align-items:center;border-radius:99px;background:var(--panel2);color:var(--muted);padding:5px 8px;font-size:.66rem;font-weight:850}.pill--good{background:var(--mint);color:var(--good)}.action-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.journey-card{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:11px;padding:17px;text-align:left;color:var(--text);cursor:pointer}.journey-card__icon{width:40px;height:40px;border-radius:12px;background:var(--panel2);display:grid;place-items:center;font-size:1.1rem;color:var(--blue)}.journey-card strong{display:block;font-size:.88rem}.journey-card small{display:block;color:var(--muted);font-size:.71rem;line-height:1.4;margin-top:2px}.journey-card b{color:var(--blue)}.journey-card:hover{border-color:color-mix(in srgb,var(--blue) 35%,var(--line));transform:translateY(-1px)}.insight-preview{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.mini-insight{padding:18px;border-radius:17px;background:var(--panel2);border:1px solid var(--line)}.mini-insight strong{font-size:.9rem}.mini-insight strong span{color:var(--yellow);margin:0 3px}.mini-insight p{margin:5px 0 0;font-size:.78rem;color:var(--muted)}.source-note{display:flex;justify-content:space-between;align-items:center;gap:24px;margin-top:34px;border-radius:18px;padding:18px 20px;background:var(--mint);border:1px solid color-mix(in srgb,var(--good) 24%,var(--line))}.source-note--plain{background:var(--panel);margin-top:24px}.source-note strong{font-size:.83rem}.source-note p{margin:3px 0 0;color:var(--muted);font-size:.76rem;max-width:760px}.page-hero{padding:22px 0 6px}.page-hero h1{font-size:clamp(2.15rem,5vw,3.7rem);line-height:1.03;margin:6px 0 9px;letter-spacing:-.06em}.page-hero p{color:var(--muted);font-size:1rem;max-width:730px;margin:0}.page-hero .actions{margin-top:20px}.library-tools{display:flex;gap:12px;align-items:center;margin:24px 0 18px;padding:10px}.search{display:flex;align-items:center;gap:9px;flex:1;border-radius:13px;background:var(--panel2);padding:4px 10px 4px 13px}.search>span{color:var(--muted);font-size:1.2rem}.search input{flex:1;min-width:0;border:0;outline:0;background:transparent;color:var(--text);padding:9px 0;font-size:.88rem}.search kbd{border:0;background:var(--panel);padding:4px 7px;border-radius:8px;color:var(--muted);font-size:.68rem}.chapter-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:13px}.chapter-card{padding:19px;cursor:pointer;transition:.18s transform,.18s box-shadow,.18s border-color;min-height:285px;display:flex;flex-direction:column}.chapter-card:hover{transform:translateY(-2px);box-shadow:var(--shadow);border-color:color-mix(in srgb,var(--blue) 35%,var(--line))}.chapter-card__top{display:flex;align-items:center;justify-content:space-between}.chapter-number{font-size:.72rem;font-weight:900;letter-spacing:.12em;color:var(--muted)}.chapter-icon{width:42px;height:42px;border-radius:13px;background:var(--panel2);display:grid;place-items:center;font-size:1.25rem}.chapter-card__status{display:flex;gap:5px;min-height:27px;margin-top:12px}.status-dot{font-size:.64rem;font-weight:850;color:var(--muted);background:var(--panel2);border-radius:99px;padding:4px 7px}.status-dot.done{color:var(--good);background:var(--mint)}.chapter-card h3{font-size:1.05rem;line-height:1.25;margin:8px 0 6px;letter-spacing:-.025em}.chapter-card p{font-size:.76rem;color:var(--muted);margin:0 0 15px}.chapter-meta{display:flex;justify-content:space-between;gap:8px;margin-top:auto;font-size:.65rem;font-weight:800;color:var(--muted)}.progress{height:6px;background:var(--panel2);border-radius:99px;overflow:hidden;margin-top:8px}.progress>span{height:100%;display:block;background:linear-gradient(90deg,var(--blue),var(--blue2));border-radius:inherit}.card-link{margin-top:12px;color:var(--blue);font-size:.75rem;font-weight:900;display:flex;justify-content:space-between}.empty-search{grid-column:1/-1;padding:50px;text-align:center;color:var(--muted)}.reading-shell{max-width:940px;margin-inline:auto}.back{display:inline-flex;border:0;background:none;color:var(--blue);font-weight:850;padding:0;margin-bottom:16px;cursor:pointer}.chapter-hero{display:grid;grid-template-columns:auto 1fr;gap:22px;align-items:start;padding:28px 0 22px;border-bottom:1px solid var(--line)}.chapter-hero__icon{width:76px;height:76px;display:grid;place-items:center;border-radius:23px;background:var(--panel);border:1px solid var(--line);font-size:2.1rem;box-shadow:var(--shadow-sm)}.chapter-hero h1{font-size:clamp(2.05rem,5vw,3.4rem);line-height:1.04;letter-spacing:-.055em;margin:8px 0 9px}.chapter-hero p{font-size:1.02rem;line-height:1.65;color:var(--muted);margin:0;max-width:760px}.why-card{display:flex;gap:13px;margin:20px 0;padding:15px 17px;border-radius:15px;background:var(--warm);border:1px solid color-mix(in srgb,var(--yellow) 34%,var(--line))}.why-card>span{font-size:1.18rem}.why-card strong{font-size:.8rem}.why-card p{font-size:.78rem;color:var(--muted);margin:2px 0 0}.audio-card{padding:20px;margin:22px 0 35px}.audio-card__head{display:flex;justify-content:space-between;gap:20px}.audio-card h2{font-size:1.12rem;margin:3px 0}.audio-card p{font-size:.75rem;color:var(--muted);margin:0}.audio-badge{align-self:flex-start;background:var(--navy);color:#fff;border-radius:9px;padding:5px 8px;font-size:.65rem;font-weight:900}.audio-card audio{width:100%;margin-top:16px}.audio-tools{display:flex;align-items:center;gap:6px;margin-top:9px;color:var(--muted);font-size:.66rem}.speed-btn{border:1px solid var(--line);background:var(--panel2);color:var(--muted);padding:4px 7px;border-radius:8px;cursor:pointer;font-size:.65rem;font-weight:850}.speed-btn.active{background:var(--blue);border-color:var(--blue);color:#fff}.audio-progress-note{margin-left:auto}.reading-content{max-width:var(--reading);margin-inline:auto}.section-head--reading{margin-top:44px}.study-section{display:grid;grid-template-columns:42px 1fr;gap:15px;padding:25px 0;border-top:1px solid var(--line)}.study-section__num{font-size:.65rem;color:var(--muted);font-weight:900;letter-spacing:.1em;padding-top:5px}.study-section h2{font-size:1.25rem;letter-spacing:-.035em;margin:0 0 8px}.study-section p{font-size:.95rem;margin:0;color:var(--text)}.study-section ul{list-style:none;padding:0;margin:14px 0 0;display:grid;gap:8px}.study-section li{position:relative;padding-left:22px;color:var(--muted);font-size:.86rem}.study-section li:before{content:"✓";position:absolute;left:0;color:var(--good);font-weight:900}.anchor-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.anchor-grid article{padding:17px;border-radius:15px;background:var(--navy);color:#fff}.anchor-grid strong{display:block;font-size:1.28rem;line-height:1.05;letter-spacing:-.04em;color:var(--yellow)}.anchor-grid span{display:block;font-size:.68rem;color:#d4e5f2;margin-top:5px}.mixup-list{display:grid;gap:8px}.mixup-list details{border:1px solid var(--line);border-radius:13px;background:var(--panel);overflow:hidden}.mixup-list summary{list-style:none;display:flex;justify-content:space-between;align-items:center;cursor:pointer;padding:14px 16px;font-size:.82rem;font-weight:900}.mixup-list summary::-webkit-details-marker{display:none}.mixup-list summary span{font-size:1.1rem;color:var(--blue)}.mixup-list details[open] summary span{transform:rotate(45deg)}.mixup-list details p{margin:0;padding:0 16px 15px;color:var(--muted);font-size:.8rem}.glossary{margin:0;border:1px solid var(--line);border-radius:16px;overflow:hidden;background:var(--panel)}.glossary>div{display:grid;grid-template-columns:150px 1fr;gap:17px;padding:13px 16px;border-bottom:1px solid var(--line)}.glossary>div:last-child{border-bottom:0}.glossary dt{font-weight:900;font-size:.8rem}.glossary dd{margin:0;color:var(--muted);font-size:.78rem}.insight-card{display:flex;gap:18px;margin:42px 0;padding:24px;border-radius:20px;background:linear-gradient(135deg,var(--navy),#145b96);color:#fff}.insight-card__mark{font-size:1.5rem;color:var(--yellow)}.insight-card .kicker{color:var(--yellow)}.insight-card h2{font-size:1.15rem;margin:3px 0 6px}.insight-card p{margin:0;color:#d8e8f5;font-size:.87rem}.chapter-finish{display:flex;justify-content:space-between;align-items:center;gap:24px;margin-top:42px;padding:22px}.chapter-finish h2{font-size:1.25rem;margin:3px 0}.chapter-finish p{margin:0;color:var(--muted);font-size:.79rem;max-width:600px}.chapter-finish__actions{display:flex;gap:9px;flex-wrap:wrap;justify-content:flex-end}.chapter-source{display:flex;justify-content:space-between;gap:25px;margin-top:25px;padding:19px 3px;color:var(--muted);border-top:1px solid var(--line)}.chapter-source strong{font-size:.74rem;color:var(--text)}.chapter-source p{font-size:.69rem;max-width:640px;margin:3px 0 0}.test-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:13px;margin-top:25px}.test-card{padding:23px}.test-card__icon{width:52px;height:52px;border-radius:15px;background:var(--panel2);display:grid;place-items:center;font-size:1.35rem;margin-bottom:14px}.test-card--primary{border-color:color-mix(in srgb,var(--blue) 32%,var(--line))}.test-card h2{font-size:1.2rem;margin:8px 0 6px;letter-spacing:-.03em}.test-card p{color:var(--muted);font-size:.81rem;min-height:50px;margin:0 0 17px}.official-status{display:flex;gap:12px;margin-top:15px;padding:14px 16px;border-radius:14px;background:var(--warm);border:1px solid color-mix(in srgb,var(--yellow) 30%,var(--line))}.official-status strong{font-size:.78rem}.official-status p{margin:2px 0 0;color:var(--muted);font-size:.73rem}.chapter-test-list{display:grid;gap:8px}.chapter-test-row{display:grid;grid-template-columns:auto 1fr auto;gap:13px;align-items:center;padding:12px 14px}.chapter-test-row__icon{width:38px;height:38px;border-radius:11px;background:var(--panel2);display:grid;place-items:center}.chapter-test-row strong{font-size:.81rem}.chapter-test-row small{display:block;color:var(--muted);font-size:.67rem}.method-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:11px}.method-card{padding:18px}.method-card>span{width:31px;height:31px;border-radius:50%;background:var(--navy);color:var(--yellow);display:grid;place-items:center;font-weight:900;font-size:.75rem}.method-card h3{font-size:.9rem;margin:12px 0 4px}.method-card p{font-size:.75rem;color:var(--muted);margin:0}.compare-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.compare-card{padding:17px}.compare-card h3{font-size:.9rem;margin:0 0 4px}.compare-card h3 b{color:var(--yellow)}.compare-card p{font-size:.76rem;color:var(--muted);margin:0}.number-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:10px}.number-card{text-align:left;padding:16px;color:var(--text);cursor:pointer}.number-card strong{display:block;font-size:1.35rem;color:var(--blue);letter-spacing:-.04em}.number-card span{display:block;font-size:.67rem;color:var(--muted);line-height:1.35}.timeline{position:relative;margin-left:65px;border-left:2px solid var(--line)}.timeline article{position:relative;padding:0 0 23px 27px}.timeline article:before{content:"";position:absolute;left:-6px;top:6px;width:10px;height:10px;border-radius:50%;background:var(--blue);border:2px solid var(--bg)}.timeline time{position:absolute;right:calc(100% + 18px);top:0;font-size:.72rem;font-weight:900;color:var(--blue)}.timeline p{margin:0;font-size:.8rem;color:var(--muted)}.source-status{display:flex;justify-content:space-between;align-items:center;gap:25px;padding:24px;margin-top:36px}.source-status h2{font-size:1.2rem;margin:3px 0 6px}.source-status p,.source-status li{font-size:.76rem;color:var(--muted)}.source-status ul{margin:8px 0 0;padding-left:18px}.source-status__actions{display:flex;flex-direction:column;gap:8px;min-width:210px}.wrong-list{display:grid;gap:9px;margin-top:25px}.wrong-row{display:flex;justify-content:space-between;align-items:center;gap:18px;padding:15px 17px}.wrong-row strong{display:block;font-size:.83rem;margin-top:2px}.quiz-shell{max-width:830px;margin:0 auto}.quiz-top{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:15px;margin-bottom:11px;font-size:.74rem;color:var(--muted);font-weight:850}.quiz-top>span:last-child{text-align:right}.quiz-progress{height:7px;border-radius:99px;background:var(--panel2);overflow:hidden;margin-bottom:18px}.quiz-progress span{height:100%;display:block;background:linear-gradient(90deg,var(--blue),var(--blue2));transition:width .2s}.question-card{padding:clamp(21px,4vw,35px)}.question-label{font-size:.68rem;text-transform:uppercase;letter-spacing:.08em;color:var(--blue);font-weight:900}.question-card h1{font-size:clamp(1.28rem,3.4vw,1.82rem);line-height:1.29;margin:9px 0 22px;letter-spacing:-.03em}.options{display:grid;gap:9px}.option{display:flex;align-items:flex-start;gap:12px;width:100%;text-align:left;padding:14px;border-radius:14px;border:1.5px solid var(--line);background:var(--panel);color:var(--text);font-size:.9rem;cursor:pointer;transition:.15s}.option:hover:not(:disabled){border-color:var(--blue);background:color-mix(in srgb,var(--blue) 5%,var(--panel))}.option__letter{display:grid;place-items:center;flex:0 0 30px;height:30px;border-radius:9px;background:var(--panel2);font-size:.72rem;font-weight:900}.option.selected{border-color:var(--blue);background:color-mix(in srgb,var(--blue) 7%,var(--panel))}.option.correct{border-color:var(--good);background:color-mix(in srgb,var(--good) 9%,var(--panel))}.option.wrong{border-color:var(--bad);background:color-mix(in srgb,var(--bad) 8%,var(--panel))}.option:disabled{cursor:default}.feedback{margin-top:18px;padding:17px;border-radius:15px;background:var(--panel2);border:1px solid var(--line)}.feedback__title{display:flex;justify-content:space-between;gap:10px}.feedback.good strong{color:var(--good)}.feedback.bad strong{color:var(--bad)}.feedback p{margin:5px 0 0;color:var(--muted);font-size:.83rem}.feedback__links{display:flex;gap:15px;flex-wrap:wrap;margin-top:9px}.feedback__links .text-button{font-size:.72rem}.question-actions{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:18px}.flag-btn{border:0;background:none;color:var(--muted);font-weight:800;cursor:pointer}.answer-hint{font-size:.7rem;color:var(--muted)}.results-shell{max-width:900px}.results-hero{text-align:center;padding:34px}.score-ring{width:142px;height:142px;border-radius:50%;margin:0 auto 16px;display:grid;place-items:center;background:conic-gradient(var(--blue) var(--score),var(--panel2) 0);position:relative}.score-ring:after{content:"";position:absolute;inset:11px;border-radius:50%;background:var(--panel)}.score-ring strong{position:relative;z-index:1;font-size:2rem}.results-hero h1{font-size:1.7rem;line-height:1.15;margin:4px auto 7px;max-width:620px}.results-hero p{color:var(--muted);font-size:.83rem;margin:0 auto;max-width:590px}.breakdown{overflow:hidden}.breakdown button{width:100%;display:grid;grid-template-columns:auto 1fr auto;gap:12px;align-items:center;border:0;border-bottom:1px solid var(--line);background:transparent;color:var(--text);padding:12px 15px;text-align:left;cursor:pointer}.breakdown button:last-child{border-bottom:0}.breakdown strong{font-size:.77rem}.breakdown .progress{margin-top:5px}.breakdown b{font-size:.74rem;color:var(--muted)}.result-list{overflow:hidden}.result-row{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:13px 15px;border-bottom:1px solid var(--line)}.result-row:last-child{border-bottom:0}.result-row strong{font-size:.77rem}.result-row small{color:var(--muted);font-size:.65rem}.badge{font-size:.65rem;font-weight:900;padding:5px 8px;border-radius:99px;background:var(--panel2);color:var(--muted)}.badge.good{background:var(--mint);color:var(--good)}.badge.bad{background:color-mix(in srgb,var(--bad) 10%,var(--panel));color:var(--bad)}.fatal{text-align:center;padding:45px}.fatal .big{font-size:2rem}.bottom-nav{position:fixed;z-index:40;bottom:14px;left:50%;transform:translateX(-50%);display:none;background:color-mix(in srgb,var(--panel) 91%,transparent);backdrop-filter:blur(18px);border:1px solid var(--line);border-radius:18px;padding:6px;box-shadow:var(--shadow);width:min(calc(100% - 22px),480px)}.bottom-nav button{flex:1;border:0;background:none;color:var(--muted);padding:7px 3px;border-radius:12px;font-size:.63rem;font-weight:800}.bottom-nav span{display:block;font-size:1rem;line-height:1.2;margin-bottom:2px}.bottom-nav button.active{background:var(--panel2);color:var(--blue)}.toast{position:fixed;z-index:80;left:50%;bottom:88px;transform:translate(-50%,20px);opacity:0;background:#102438;color:#fff;padding:10px 14px;border-radius:12px;font-size:.79rem;box-shadow:var(--shadow);transition:.2s;pointer-events:none}.toast.show{opacity:1;transform:translate(-50%,0)}
@media(max-width:900px){.desktop-nav{display:none}.action-grid{grid-template-columns:repeat(2,1fr)}.chapter-grid{grid-template-columns:repeat(2,1fr)}.method-grid{grid-template-columns:repeat(2,1fr)}.number-grid{grid-template-columns:repeat(3,1fr)}.bottom-nav{display:flex}.dashboard-strip{grid-template-columns:repeat(2,1fr)}.dashboard-strip>div:nth-child(2){border-right:0}.dashboard-strip>div:nth-child(-n+2){border-bottom:1px solid var(--line)}.anchor-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:650px){.shell{width:min(calc(100% - 22px),var(--max))}.topbar__inner{height:64px}.brand small{display:none}main{padding-top:20px}.hero{padding:28px 22px;border-radius:23px}.hero h1{font-size:2.45rem}.hero p{font-size:.91rem}.hero__path{overflow-x:auto;gap:8px;margin-right:-22px;padding-right:22px}.hero__path i{display:none}.hero__path div{min-width:108px}.dashboard-strip .metric{font-size:1.25rem}.continue-card{grid-template-columns:auto 1fr}.continue-card>.btn{grid-column:1/-1;width:100%}.continue-card__icon{width:54px;height:54px;border-radius:16px}.section-head{margin-top:30px}.action-grid,.insight-preview,.chapter-grid,.test-grid,.compare-grid{grid-template-columns:1fr}.chapter-card{min-height:0}.source-note,.source-status,.chapter-finish,.chapter-source{display:block}.source-note .btn{margin-top:12px}.source-status__actions,.chapter-finish__actions{margin-top:15px}.chapter-finish__actions{justify-content:flex-start}.chapter-finish__actions .btn{width:100%}.chapter-hero{grid-template-columns:1fr;gap:12px}.chapter-hero__icon{width:58px;height:58px;font-size:1.6rem}.chapter-hero h1{font-size:2.25rem}.audio-card__head{display:block}.audio-badge{display:inline-block;margin-top:8px}.audio-tools{flex-wrap:wrap}.audio-progress-note{width:100%;margin-left:0}.study-section{grid-template-columns:29px 1fr;gap:9px}.study-section h2{font-size:1.1rem}.study-section p{font-size:.89rem}.study-section li{font-size:.81rem}.glossary>div{grid-template-columns:1fr;gap:2px}.number-grid{grid-template-columns:repeat(2,1fr)}.chapter-test-row{grid-template-columns:auto 1fr}.chapter-test-row .btn{grid-column:1/-1;width:100%}.wrong-row{display:block}.wrong-row .text-button{margin-top:8px}.quiz-top{grid-template-columns:auto 1fr auto}.quiz-top>span:nth-child(2){text-align:center}.question-card{border-radius:17px}.library-tools{display:block}.library-tools>.btn{width:100%;margin-top:8px}.timeline{margin-left:54px}}
@media(max-width:390px){.hero h1{font-size:2.12rem}.action-grid{grid-template-columns:1fr}.dashboard-strip>div{padding:14px}.number-grid,.anchor-grid{grid-template-columns:1fr}.chapter-hero h1{font-size:2rem}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
.intro-audio{display:grid;grid-template-columns:1fr minmax(280px,420px);gap:22px;align-items:center;padding:18px 20px;margin:24px 0 12px}.intro-audio h2{font-size:1rem;margin:3px 0}.intro-audio p{margin:0;color:var(--muted);font-size:.75rem}.intro-audio audio{width:100%}@media(max-width:650px){.intro-audio{grid-template-columns:1fr}.intro-audio audio{margin-top:4px}}
.exam-tips{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:9px}.exam-tips article{padding:12px 14px;border-radius:13px;background:var(--panel2);border:1px solid var(--line)}.exam-tips strong{font-size:.72rem}.exam-tips p{margin:3px 0 0;color:var(--muted);font-size:.67rem}@media(max-width:760px){.exam-tips{grid-template-columns:repeat(2,1fr)}}@media(max-width:420px){.exam-tips{grid-template-columns:1fr}}