:root{--navy:#123e73;--navy-dark:#0b2c55;--blue:#2f80ed;--blue-soft:#eaf3ff;--yellow:#ffc928;--ink:#142a43;--muted:#66788c;--line:#d8e4f0;--paper:#fff;--canvas:#f2f7fc;--danger:#c73737;--danger-soft:#fff1f1;--success:#16845b;--success-soft:#ecfbf4;--shadow:0 18px 55px #133d6c1f}*{box-sizing:border-box}html{background:var(--canvas);scroll-behavior:smooth}body{min-height:100vh;color:var(--ink);background:radial-gradient(circle at 8% 0%, #2f80ed1f, transparent 25rem), radial-gradient(circle at 96% 8%, #ffc92829, transparent 22rem), var(--canvas);margin:0;font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif}button,input{font:inherit}button{-webkit-tap-highlight-color:transparent}button:focus-visible,input:focus-visible{outline-offset:3px;outline:3px solid #2f80ed59}.shell{width:min(100% - 36px,980px);margin:0 auto;padding:28px 0 54px}.topbar{justify-content:space-between;align-items:center;gap:18px;min-height:48px;margin-bottom:26px;display:flex}.brand{color:var(--navy);align-items:center;gap:12px;font-size:1rem;font-weight:900;display:flex}.brand-mark{width:40px;height:40px;color:var(--navy);background:var(--yellow);border-radius:12px;place-items:center;font:900 1.25rem/1 Georgia,serif;display:grid;box-shadow:0 6px 15px #ffb90038}.eyebrow,.section-kicker,.lesson-label{color:var(--blue);letter-spacing:.08em;text-transform:uppercase;font-size:.82rem;font-weight:900}.catalog-hero,.practice-intro{color:#fff;background:linear-gradient(135deg, var(--navy-dark), var(--navy) 62%, #1f5d9d);box-shadow:var(--shadow);border-radius:28px;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:34px;padding:clamp(26px,5vw,48px);display:grid}.catalog-hero .eyebrow,.practice-intro .eyebrow{color:#a8d4ff}.catalog-hero h1,.practice-intro h1{letter-spacing:-.035em;margin:8px 0 10px;font-size:clamp(2rem,6vw,3.65rem);line-height:1.08}.catalog-hero p,.practice-intro p{color:#d8e9fa;max-width:650px;margin:0;font-size:1rem;line-height:1.75}.library-stat{text-align:center;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);background:#ffffff17;border:1px solid #ffffff2e;border-radius:20px;min-width:172px;padding:22px;display:grid}.library-stat strong{color:var(--yellow);font-size:3rem;line-height:1}.library-stat span{margin-top:8px;font-weight:800}.library-stat small{color:#bed7ed;margin-top:5px;font-size:.82rem}.book-list{gap:24px;margin-top:22px;display:grid}.book-section{border:1px solid var(--line);background:#ffffffe6;border-radius:24px;padding:clamp(22px,4vw,34px);box-shadow:0 12px 35px #133d6c12}.section-heading{border-bottom:1px solid var(--line);justify-content:space-between;align-items:flex-end;gap:20px;padding-bottom:20px;display:flex}.section-heading h2{color:var(--navy);margin:5px 0 0;font-size:clamp(1.35rem,4vw,1.9rem)}.section-heading>span{color:var(--muted);font-size:.92rem;font-weight:700}.unit-list{gap:28px;padding-top:26px;display:grid}.unit-title{align-items:center;gap:14px;margin-bottom:14px;display:flex}.unit-title>span{width:43px;height:43px;color:var(--navy);background:var(--yellow);border-radius:13px;flex:none;place-items:center;font-weight:900;display:grid}.unit-title h3{color:var(--navy);margin:0;font-size:1.18rem}.unit-title p{color:var(--muted);margin:3px 0 0;font-size:.88rem}.lesson-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;display:grid}.lesson-card{background:#fff;border:1px solid #cfddec;border-radius:18px;flex-direction:column;justify-content:space-between;min-height:190px;padding:22px;transition:transform .16s,border-color .16s,box-shadow .16s;display:flex}.lesson-card:hover{border-color:#8ab9f3;transform:translateY(-2px);box-shadow:0 14px 26px #1e5b9e1a}.lesson-card h4{color:var(--navy-dark);margin:8px 0 6px;font-size:1.22rem}.lesson-card p{color:var(--muted);margin:0;font-size:.92rem}.lesson-footer{justify-content:space-between;align-items:center;gap:16px;margin-top:26px;display:flex}.lesson-footer>span{color:var(--muted);font-size:.9rem}.lesson-footer>span strong{color:var(--navy);font-size:1.2rem}.lesson-footer button{color:#fff;background:var(--blue);cursor:pointer;border:0;border-radius:12px;min-height:44px;padding:0 16px;font-weight:900}.lesson-footer button:hover{background:#1d6fd9}.content-error,.empty-state{background:var(--danger-soft);border:1px solid #f1c3c3;border-radius:20px;margin-top:22px;padding:28px}.content-error h2,.empty-state h2{color:var(--navy);margin:0 0 8px}.content-error p,.empty-state p{color:var(--muted);margin:0}.content-error ul{margin-bottom:0;line-height:1.7}.practice-intro{padding-block:28px}.practice-intro h1{font-size:clamp(1.8rem,5vw,2.75rem)}.end-button{color:#fff;cursor:pointer;background:#ffffff1a;border:1px solid #ffffff59;border-radius:13px;min-height:46px;padding:0 18px;font-weight:900}.end-button:hover{background:#ffffff2e}.scoreboard{border:1px solid var(--line);background:#fff;border-radius:18px;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:24px;margin:18px 0;padding:19px 22px;display:grid;box-shadow:0 8px 24px #143c690f}.progress-copy{color:var(--muted);justify-content:space-between;gap:20px;margin-bottom:9px;font-size:.9rem;font-weight:800;display:flex}.progress-track{background:#e8eff6;border-radius:999px;height:10px;overflow:hidden}.progress-track span{border-radius:inherit;background:linear-gradient(90deg, var(--blue), #62a5ff);height:100%;transition:width .22s;display:block}.score{min-width:78px;color:var(--muted);align-items:baseline;gap:4px;font-size:.9rem;display:flex}.score strong{color:var(--navy);font-size:2rem;line-height:1}.quiz-card,.result-card{border:1px solid 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strong{color:var(--navy);font-size:1.32rem}.group-dots{color:#b8cbe0;gap:4px;font-size:.95rem;display:flex}.group-dots .filled{color:var(--blue)}.group-dots .current{color:var(--navy)}.group-progress-dots{color:#b8cbe0;align-items:center;gap:5px;font-size:.8rem;display:flex}.group-progress-dots .dot{font-size:.8rem}.group-progress-dots .dot.done{color:#2aa06a}.group-progress-dots em{color:var(--muted);margin-left:6px;font-size:.82rem;font-style:normal;font-weight:800}.group-side{justify-items:end;gap:8px;display:grid}.review-entry{min-height:44px;color:var(--navy);cursor:pointer;background:#fff;border:1px solid #b9d6f7;border-radius:13px;padding:0 16px;font-weight:900}.review-entry:hover{border-color:var(--blue);color:var(--blue)}.star-line{color:#b07d09;font-size:.92rem;font-weight:900}.star-line em{color:var(--muted);font-style:normal;font-weight:800}.adapt-notice{color:#23527f;background:#f2f8ff;border:1px solid #b9d6f7;border-radius:13px;margin:0 0 16px;padding:11px 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