:root{--ink:#25282d;--muted:#687087;--paper:#fffaf4;--card:#fff;--purple:#e87800;--purple2:#f59e0b;--pink:#ef6c00;--blue:#2563eb;--green:#15803d;--red:#c2413b;--line:#eee3d7;--shadow:0 18px 50px rgba(75,50,20,.12)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:radial-gradient(circle at 10% 10%,#fff0dc 0,transparent 35%),radial-gradient(circle at 90% 20%,#fff7e8 0,transparent 32%),var(--paper);color:var(--ink);font-family:Inter,ui-rounded,"SF Pro Rounded",system-ui,-apple-system,sans-serif;min-height:100vh}.topbar{height:74px;padding:0 max(22px,calc((100vw - 1160px)/2));display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid rgba(232,120,0,.12);background:rgba(255,250,244,.88);backdrop-filter:blur(16px);position:sticky;top:0;z-index:20}.brand{display:flex;gap:11px;align-items:center;color:var(--ink);text-decoration:none;font-weight:800}.brandmark{display:grid;place-items:center;width:38px;height:38px;border-radius:12px;background:linear-gradient(135deg,var(--purple),var(--pink));color:#fff;box-shadow:0 8px 20px rgba(124,58,237,.26)}.progress-mini{font-size:12px;color:var(--muted);width:180px}.track{height:7px;background:#e9e4f6;border-radius:99px;margin-top:6px;overflow:hidden}.track i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--purple),var(--pink));transition:.4s}.screen{display:none;max-width:1160px;margin:0 auto;padding:48px 24px 110px}.screen.active{display:block}.hero{min-height:calc(100vh - 74px);align-items:center;grid-template-columns:1.15fr .85fr;gap:70px}.hero.active{display:grid}.eyebrow{text-transform:uppercase;letter-spacing:.13em;font-weight:800;font-size:12px;color:var(--purple);margin:0 0 12px}.hero h1{font-size:clamp(42px,6vw,76px);line-height:.98;letter-spacing:-.055em;margin:0 0 24px;max-width:750px}.lead{font-size:20px;line-height:1.55;color:var(--muted);max-width:650px}.hero-actions{display:flex;gap:12px;margin:30px 0 16px}.primary,.secondary,.ghost{border:0;border-radius:14px;padding:13px 18px;font-size:15px;font-weight:800;cursor:pointer;transition:.2s}.primary{background:linear-gradient(135deg,var(--purple),var(--purple2));color:#fff;box-shadow:0 10px 24px rgba(124,58,237,.25)}.primary:hover{transform:translateY(-2px)}.primary:disabled{opacity:.45;transform:none;cursor:not-allowed}.secondary{background:#eee9fa;color:var(--purple)}.ghost{background:transparent;color:var(--muted);border:1px solid var(--line)}.quiet{font-size:13px;color:var(--muted)}.hero-card{background:rgba(255,255,255,.88);border:1px solid #fff;border-radius:30px;padding:28px;box-shadow:var(--shadow)}.hero-card ul{list-style:none;padding:0;margin:24px 0 0;display:grid;gap:9px}.hero-card li{display:flex;align-items:center;gap:11px;padding:12px;border-radius:14px;background:#f7f4fc}.hero-card li 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h2{font-size:40px;letter-spacing:-.035em;margin:0}.topic-tabs{display:flex;gap:9px;overflow:auto;padding-bottom:8px;margin-bottom:20px}.topic-tabs button{white-space:nowrap;border:1px solid var(--line);background:#fff;border-radius:999px;padding:10px 14px;color:var(--muted);font-weight:700;cursor:pointer}.topic-tabs button.active{color:#fff;background:var(--purple);border-color:var(--purple)}.lesson{background:var(--card);border:1px solid #fff;border-radius:24px;padding:clamp(24px,4vw,45px);box-shadow:var(--shadow)}.lesson h3{font-size:29px;margin:0 0 13px}.lesson .formula{font-family:Georgia,serif;font-size:26px;background:#f4f0fb;border-left:5px solid var(--purple);padding:17px 20px;border-radius:10px;margin:18px 0}.lesson-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:15px}.rule{padding:17px;border:1px solid var(--line);border-radius:15px}.rule b{display:block;color:var(--purple);margin-bottom:7px}.trybox{margin-top:22px;background:#effaf2;border:1px solid #c8ebd2;padding:18px;border-radius:16px}.practice-layout{display:grid;grid-template-columns:150px 1fr;gap:20px}.score-card,.quiz-card,.panel{background:#fff;border:1px solid #fff;border-radius:24px;box-shadow:var(--shadow)}.score-card{padding:20px;height:max-content;display:grid;gap:5px;text-align:center;color:var(--muted)}.score-card strong{font-size:35px;color:var(--purple);margin-bottom:13px}.quiz-card{padding:clamp(24px,5vw,45px)}.quiz-meta{display:flex;justify-content:space-between;color:var(--muted);font-size:13px;font-weight:800;text-transform:uppercase;letter-spacing:.08em}.quiz-card h3{font-size:clamp(23px,3vw,34px);line-height:1.25;margin:22px 0}.answers{display:grid;gap:10px}.answer-btn{width:100%;text-align:left;padding:15px 17px;border:1px solid var(--line);border-radius:13px;background:#fff;font-size:16px;cursor:pointer}.answer-btn:hover{border-color:#b9a3ed;background:#faf8ff}.answer-btn.correct{border-color:#6fc28a;background:#effaf2}.answer-btn.wrong{border-color:#e6a09b;background:#fff3f2}.feedback{min-height:58px;margin-top:15px;padding:0 2px;font-weight:650;line-height:1.45}.feedback.good{color:var(--green)}.feedback.bad{color:var(--red)}.feedback.hint{color:var(--blue)}.quiz-actions{display:flex;justify-content:space-between;margin-top:10px}.test-intro{text-align:center;padding:50px;max-width:650px;margin:0 auto}.test-intro h3{font-size:34px;margin:0 0 10px}.hidden{display:none!important}.test-grid{display:grid;gap:14px}.test-q{background:#fff;border-radius:18px;border:1px solid var(--line);padding:20px}.test-q h3{font-size:18px;margin:0 0 12px}.test-q label{display:block;padding:9px 0}.test-q input{margin-right:8px}.test-submit{margin:12px 0 0}.result-score{text-align:center;font-size:56px;font-weight:900;color:var(--purple);margin:5px}.result-list{display:grid;gap:8px;margin-top:20px}.result-row{padding:12px;border-radius:12px;background:#f6f3fb}.decision-tree{max-width:950px;margin:0 auto}.decision{background:#fff;border:1px solid var(--line);border-radius:17px;padding:20px;box-shadow:0 8px 25px rgba(40,30,70,.06);display:flex;flex-direction:column;gap:8px}.decision em{font-style:normal;font-weight:900;color:var(--purple)}.start-node{max-width:400px;margin:0 auto 35px;text-align:center;position:relative}.start-node:after{content:"";width:2px;height:35px;background:#cfc6e6;position:absolute;left:50%;bottom:-36px}.branch-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:15px}.bottomnav{position:fixed;z-index:30;bottom:18px;left:50%;transform:translateX(-50%);display:flex;gap:4px;padding:7px;border-radius:19px;background:rgba(31,25,50,.92);box-shadow:0 15px 35px rgba(22,16,41,.3);backdrop-filter:blur(15px)}.bottomnav button{border:0;background:transparent;color:#aaa2ba;border-radius:13px;padding:8px 15px;font-size:11px;font-weight:750;cursor:pointer}.bottomnav button span{display:block;font-size:18px;margin-bottom:2px}.bottomnav button.active{background:#fff;color:var(--purple)}
.name-gate{position:fixed;inset:0;background:rgba(24,17,45,.76);backdrop-filter:blur(12px);display:grid;place-items:center;padding:18px;z-index:100}.name-card{width:min(460px,100%);background:#fff;border-radius:24px;padding:30px;box-shadow:var(--shadow)}.name-card h2{font-size:31px;margin:0 0 10px}.name-card input{width:100%;padding:14px;border:1px solid var(--line);border-radius:12px;font:inherit;margin:8px 0 12px}.name-card button{width:100%}.error{color:var(--red);min-height:20px}
@media(max-width:760px){.topbar{height:64px}.brand span:last-child{display:none}.progress-mini{width:145px}.screen{padding:30px 16px 105px}.hero.active{display:block}.hero{min-height:auto}.hero h1{font-size:47px}.lead{font-size:17px}.hero-card{margin-top:35px}.orbit{height:160px}.hero-actions{flex-direction:column}.hero-actions button{width:100%}.section-head{align-items:center}.section-head h2{font-size:32px}.section-head .ghost{font-size:12px;padding:9px}.lesson-grid,.branch-grid{grid-template-columns:1fr}.practice-layout{grid-template-columns:1fr}.score-card{grid-template-columns:repeat(6,1fr);align-items:center;padding:12px}.score-card strong{font-size:23px;margin:0}.bottomnav{bottom:8px;width:calc(100% - 16px);justify-content:space-around}.bottomnav button{padding:7px 9px}.lesson{padding:22px}.quiz-card{padding:22px}}