@import url('');:root{--bg:#f6f2e8;--paper:#fffdf8;--ink:#193d32;--muted:#60736c;--accent:#c55d36;--line:#d9dfd4;--soft:#e9eee6;--good:#28765c;--bad:#b84842;--gold:#e4b85e}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:system-ui,-apple-system,Segoe UI,sans-serif}button,select,input{font:inherit}button{cursor:pointer}a{color:var(--ink)}header{background:var(--ink);color:#fff}header .wrap{max-width:1160px;margin:auto;padding:17px 22px;display:flex;align-items:center;justify-content:space-between;gap:12px}.brand{font-family:Georgia,serif;font-size:24px;font-weight:bold;color:white;text-decoration:none}.brand span{color:#f0c783}.nav{font-size:13px;opacity:.9}.nav a{color:white;text-decoration:none;margin-left:14px}main{max-width:1160px;margin:0 auto;padding:30px 22px 70px}.hero{display:grid;grid-template-columns:1.4fr .6fr;gap:22px;align-items:stretch}.eyebrow{text-transform:uppercase;letter-spacing:.15em;font-size:12px;font-weight:800;color:var(--accent)}h1,h2,h3{font-family:Georgia,serif}h1{font-size:clamp(36px,5vw,58px);line-height:1.06;margin:12px 0}h2{font-size:29px}h3{font-size:21px}.lead{font-size:18px;line-height:1.7;color:#425e54;max-width:680px}.hero-art{background:var(--ink);color:#fff;border-radius:24px;min-height:280px;padding:26px;display:flex;flex-direction:column;justify-content:center;align-items:center;position:relative;overflow:hidden}.orbit{width:200px;height:200px;border:1px solid #85a795;border-radius:50%;position:relative;transform:rotate(-27deg)}.orbit:before,.orbit:after{content:'';position:absolute;border:1px solid #85a795;border-radius:50%;inset:27px -35px;transform:rotate(62deg)}.orbit:after{inset:-26px 34px;transform:rotate(-62deg)}.orb-core{position:absolute;width:42px;height:42px;background:#e5c075;border-radius:50%;left:78px;top:78px;box-shadow:0 0 38px #e5c07580}.hero-art small{margin-top:20px;letter-spacing:.2em}.stats{display:flex;flex-wrap:wrap;gap:12px;margin:26px 0}.stat{background:var(--paper);border:1px solid var(--line);padding:16px 20px;border-radius:14px;min-width:135px}.stat strong{font-family:Georgia,serif;font-size:27px;display:block}.stat span{font-size:12px;color:var(--muted)}.panel{background:var(--paper);border:1px solid var(--line);border-radius:20px;padding:24px;margin:22px 0;box-shadow:0 7px 24px #1b45300a}.controls{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:14px}.field label{font-size:12px;display:block;font-weight:750;margin-bottom:7px}.field select{width:100%;padding:12px;background:white;border:1px solid #cbd5c9;border-radius:10px;color:var(--ink)}.btn{border:0;border-radius:11px;padding:12px 20px;background:var(--ink);color:white;font-weight:750;display:inline-flex;align-items:center;justify-content:center;gap:8px}.btn:hover{filter:brightness(1.13)}.btn.secondary{background:var(--soft);color:var(--ink)}.btn.orange{background:var(--accent)}.btn:disabled{opacity:.45;cursor:not-allowed}.modebar{display:flex;gap:10px;flex-wrap:wrap;margin:18px 0}.mode{background:var(--soft);border:1px solid var(--line);border-radius:12px;padding:12px 16px;min-width:150px;text-align:left;color:var(--ink)}.mode.active{background:var(--ink);color:white;border-color:var(--ink)}.mode strong{display:block}.mode small{display:block;margin-top:3px;opacity:.8}.topics{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}.topic{border:1px solid var(--line);border-radius:14px;background:var(--paper);padding:16px;text-align:left;color:var(--ink)}.topic:hover,.topic:focus-visible{border-color:var(--accent);box-shadow:0 0 0 2px #c55d3630}.topic strong{display:block;font-size:14px}.topic small{color:var(--muted);font-size:12px}.topic .symbol{font-size:25px;margin-bottom:8px;color:var(--accent)}.quiz-top{display:flex;justify-content:space-between;gap:15px;align-items:center;flex-wrap:wrap}.pill{font-size:12px;padding:7px 12px;border-radius:30px;background:var(--soft);font-weight:750}.progress{height:9px;background:var(--soft);border-radius:30px;overflow:hidden;margin:18px 0 24px}.progress>div{height:100%;width:0;background:var(--accent);transition:width .3s}.qtext{font-family:Georgia,serif;font-size:clamp(23px,3vw,32px);line-height:1.5;margin:15px 0 22px}.answers{display:grid;grid-template-columns:1fr 1fr;gap:12px}.answer{background:white;border:1px solid var(--line);padding:17px;text-align:left;border-radius:13px;min-height:74px;color:var(--ink);line-height:1.6}.answer:hover:not(:disabled){border-color:var(--accent);background:#fff8ef}.answer b{display:inline-flex;width:27px;height:27px;border-radius:8px;align-items:center;justify-content:center;background:var(--soft);margin-right:8px;font-size:12px}.answer.selected{border:2px solid var(--accent);background:#fff4e9}.answer.correct{border:2px solid var(--good);background:#e6f4ec}.answer.incorrect{border:2px solid var(--bad);background:#faeceb}.answer:disabled{cursor:default}.explain{margin-top:18px;background:#eef5ef;border-left:4px solid var(--good);padding:17px;border-radius:9px;line-height:1.7}.explain.wrong{background:#fff1e9;border-color:var(--accent)}.qactions{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-top:22px;flex-wrap:wrap}.muted{color:var(--muted)}.hidden{display:none!important}.result{text-align:center}.result .big{font-size:70px;font-family:Georgia,serif;color:var(--accent)}.review-item{padding:17px 0;border-top:1px solid var(--line)}.review-item h4{font-size:16px;margin:8px 0}.review-item p{margin:7px 0;line-height:1.6}.review-item .ok{color:var(--good)}.review-item .no{color:var(--bad)}footer{padding:28px;text-align:center;font-size:13px;color:var(--muted);border-top:1px solid var(--line)}.toast{position:fixed;bottom:20px;right:20px;background:var(--ink);color:#fff;padding:14px 18px;border-radius:12px;box-shadow:0 8px 30px #0003;z-index:3}.katex-display{overflow:auto;max-width:100%}code{background:var(--soft);padding:2px 5px;border-radius:5px}@media(max-width:850px){.controls{grid-template-columns:1fr 1fr}.topics{grid-template-columns:repeat(2,minmax(0,1fr))}.hero{grid-template-columns:1fr}.hero-art{min-height:230px}}@media(max-width:560px){.controls,.answers,.topics{grid-template-columns:1fr}.panel{padding:18px}.brand{font-size:20px}.nav a{margin-left:7px;font-size:11px}.stat{flex:1;min-width:95px}.hero-art{display:none}}