:root{font-family:system-ui,-apple-system,Malgun Gothic,sans-serif;color:#edf7f4;background:#0b1426;--panel:#142638;--soft:#20394a;--ink:#edf7f4;--muted:#bed0d9;--line:#739a9c;--accent:#b8efd3;--on:#17382c;color-scheme:dark}html[data-eco-theme=white]{--panel:#fff;--soft:#edf4f0;--ink:#17382c;--muted:#405c51;--line:#56776a;--accent:#17654c;--on:#fff;background:#f2f7f3;color:var(--ink);color-scheme:light}*{box-sizing:border-box}body{margin:0;color:var(--ink)}a{color:inherit}button,input,select{font:inherit;font-size:16px;min-height:46px;border:1px solid var(--line);border-radius:12px;padding:10px 15px;color:var(--ink);background:var(--soft);max-width:100%}button{cursor:pointer;font-weight:700}button:disabled{opacity:.55;cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #ac9afa;outline-offset:3px}header{max-width:1240px;margin:auto;padding:22px 28px;display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap}header .brand{font-size:25px;font-weight:900;text-decoration:none}nav{display:flex;gap:18px;flex-wrap:wrap}nav a{font-size:15px;min-height:44px;display:flex;align-items:center}main{max-width:1240px;padding:0 28px 40px;margin:auto}h1{font-size:clamp(35px,5vw,62px);line-height:1.15;margin:16px 0;letter-spacing:-.045em}h1 em{font-style:normal;color:var(--accent)}h2{font-size:26px;line-height:1.5}h3{font-size:21px}p{line-height:1.7;color:var(--muted)}.hero{position:relative;display:grid;grid-template-columns:1.5fr 1fr;gap:22px;border:1px solid var(--line);border-radius:28px;padding:38px;background:var(--panel);overflow:hidden}.hero p{font-size:18px}.eyebrow{font-size:13px;letter-spacing:.15em;font-weight:800}.actions{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:18px 0}.actions a{font-size:15px;min-height:44px;display:inline-flex;align-items:center}.primary{background:var(--accent);color:var(--on);border-color:var(--accent)}.orbit{width:min(280px,100%);aspect-ratio:1;align-self:center;justify-self:center;border:2px solid #bba6f6;border-radius:50%;position:relative;background:radial-gradient(circle at 35% 25%,#506f9c,#182443 60%,#6961a5);color:#fff;display:grid;place-items:center;box-shadow:0 0 60px #806fa633}.orbit:before{content:"";position:absolute;width:120%;height:34%;border:10px double #9af1d5;border-radius:50%;transform:rotate(-26deg)}.orbit b{font-size:22px;letter-spacing:.16em;text-align:center;z-index:1;text-shadow:0 2px 5px #061c31}.orbit span{position:absolute;top:0;right:5px;font-size:38px}.orbit i{position:absolute;bottom:25px;left:0;font-size:26px}.stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px;grid-column:1/-1;margin-top:12px}.stats strong{font-size:32px;border-top:1px solid var(--line);padding:18px 0}.stats small{display:block;font-size:14px;font-weight:500;color:var(--muted);margin-top:6px}.tabs{display:flex;gap:10px;margin:26px 0;flex-wrap:wrap}.tabs [aria-pressed=true]{background:var(--accent);color:var(--on)}.filters,.panel,.session,.worksheet{padding:26px;border:1px solid var(--line);border-radius:20px;background:var(--panel);margin:24px 0}.filters{display:flex;gap:15px;flex-wrap:wrap;align-items:end}.filters label{display:grid;gap:8px;flex:1;min-width:180px}.filters .search{flex:2}.filters .actions,.filters>p{width:100%;margin:3px 0}.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.cards article{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:22px;min-width:0}.cards h2{font-size:22px;overflow-wrap:anywhere}.cards .tag{color:var(--muted);font-size:13px}.cards .actions{margin-bottom:0}.cards small{display:block;margin-top:10px;color:var(--muted)}.more{display:block;margin:22px auto}.session{max-width:850px;margin:26px auto}.session-meta{display:flex;gap:12px;justify-content:space-between;font-size:15px}.session>progress{width:100%;height:8px;margin:15px 0}.question{font-size:clamp(23px,3.5vw,32px);line-height:1.6;overflow-wrap:anywhere;margin:18px 0 28px}.choices{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.choices button{min-height:64px;font-size:20px}.session form label{display:grid;gap:12px}.session form input{font-size:24px}.session form button{margin-top:15px}.feedback{padding:18px;border:2px solid var(--accent);border-radius:16px;margin:22px 0;background:var(--soft)}.feedback.incorrect{border-color:#d7a071}.feedback p{color:var(--ink);font-size:18px}.quiet{margin-top:20px;background:transparent}.note{font-size:14px}.notice{border:1px solid var(--line);padding:14px;border-radius:12px;background:var(--panel)}.result-list p{border-bottom:1px solid var(--line);padding-bottom:14px}.result-list span{display:block}.review-list>div{display:flex;gap:16px;justify-content:space-between;padding:16px 0;border-bottom:1px solid var(--line)}.review-list span{flex:1}.review-list small{display:block;margin-top:7px;color:var(--muted)}.topic-progress{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:24px 0}.topic-progress>div{display:grid;grid-template-columns:120px 1fr 70px;align-items:center;gap:12px;min-width:0}.topic-progress progress{width:100%}progress{accent-color:var(--accent)}.sources a{padding:8px 14px;border:1px solid var(--line);border-radius:10px}.worksheet li{margin:20px 0}.worksheet summary{cursor:pointer;min-height:44px}footer{padding:28px;text-align:center;border-top:1px solid var(--line);line-height:1.8}footer p{font-size:14px}@media(max-width:760px){main{padding:0 14px 24px}header{padding:16px}.hero{padding:25px;grid-template-columns:1fr}.orbit{display:none}.stats{gap:8px}.stats strong{font-size:26px}.stats small{font-size:12px}.cards{grid-template-columns:repeat(2,minmax(0,1fr))}.cards article{padding:17px}.filters,.panel,.session,.worksheet{padding:20px}.topic-progress{grid-template-columns:1fr}}@media(max-width:430px){.cards,.choices{grid-template-columns:1fr}.stats strong{font-size:23px}.topic-progress>div{grid-template-columns:105px 1fr 55px;font-size:13px}.tabs button{flex:1;padding:8px}.session-meta{flex-wrap:wrap}nav{gap:12px}nav a{font-size:14px}}@media print{body{background:#fff;color:#000}header,footer,.hero,.tabs,.filters,.cards,.sources,.more,.notice{display:none!important}main{max-width:none;padding:0}.worksheet{border:0;background:#fff;margin:0;padding:0}.worksheet .actions{display:none}.worksheet p{color:#000}.worksheet li{break-inside:avoid}.worksheet details:not([open]){display:none}}
