:root{--bg:#f4f6f8;--panel:#fff;--text:#172033;--muted:#687386;--accent:#147d78;--accent2:#dff3f1;--border:#dbe1e8;--danger:#9c3d3d}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--bg);color:var(--text)}button,input,select{font:inherit}header{position:sticky;top:0;z-index:5;background:#17233c;color:white;padding:16px 18px;display:flex;justify-content:space-between;align-items:center}header h1{margin:0;font-size:22px}header p{margin:2px 0 0;color:#cbd4e2;font-size:13px}.ghost{border:1px solid #7f8aa0;background:transparent;color:white;border-radius:10px;padding:8px 10px;font-size:12px}main{padding:16px 16px 92px;max-width:1050px;margin:auto}.hero{background:linear-gradient(135deg,#17233c,#284361);color:white;border-radius:22px;padding:22px}.hero h2{margin:0 0 8px}.hero p{color:#d7dfeb;line-height:1.5}.grid{display:grid;gap:14px}.stats{grid-template-columns:repeat(2,1fr);margin-top:14px}.card{background:var(--panel);border:1px solid var(--border);border-radius:18px;padding:16px}.card h3{margin:0 0 8px}.muted{color:var(--muted)}.stat strong{font-size:28px;display:block}.section-title{margin:24px 2px 10px}.btn{border:0;background:var(--accent);color:white;border-radius:12px;padding:11px 14px}.btn.secondary{background:var(--accent2);color:#0d5c58}.search{width:100%;padding:13px;border:1px solid var(--border);border-radius:13px;background:white}.topic-list{display:grid;gap:10px}.topic{cursor:pointer}.topic p{line-height:1.5}.topic .tag,.tag{display:inline-block;background:var(--accent2);color:#0c5e59;border-radius:999px;padding:4px 9px;font-size:12px;margin:3px}.atlas{grid-template-columns:repeat(2,1fr)}.figure img{width:100%;aspect-ratio:1/1;object-fit:contain;background:#0e1420;border-radius:12px}.figure h4{margin:10px 0 5px}.figure p{font-size:13px;line-height:1.45}.filters{grid-template-columns:repeat(2,1fr);margin-bottom:12px}.filters select{width:100%;padding:10px;border:1px solid var(--border);border-radius:10px}.flash{min-height:250px;display:flex;flex-direction:column;justify-content:center;text-align:center}.answer{background:var(--accent2);border-radius:14px;padding:14px;margin-top:14px}.options{display:grid;gap:9px}.option{border:1px solid var(--border);background:white;border-radius:12px;padding:12px;text-align:left}.correct{border-color:var(--accent);background:var(--accent2)}.wrong{border-color:var(--danger);background:#fbeaea}.checklist label{display:block;padding:10px 0;border-bottom:1px solid var(--border)}.report-box{background:#eef3f7;border-left:4px solid var(--accent);padding:14px;border-radius:10px;line-height:1.55}.bottom{position:fixed;bottom:0;left:0;right:0;background:white;border-top:1px solid var(--border);display:grid;grid-template-columns:repeat(5,1fr);padding:7px max(6px,env(safe-area-inset-right)) calc(7px + env(safe-area-inset-bottom)) max(6px,env(safe-area-inset-left));z-index:10}.bottom button{border:0;background:transparent;padding:9px 3px;color:var(--muted);font-size:12px}.bottom button.active{color:var(--accent);font-weight:700}@media(min-width:760px){.stats{grid-template-columns:repeat(4,1fr)}.atlas{grid-template-columns:repeat(3,1fr)}.filters{grid-template-columns:repeat(4,1fr)}.bottom{position:sticky;top:76px;bottom:auto;max-width:800px;margin:auto;border:1px solid var(--border);border-radius:14px;padding:6px}.bottom button{font-size:14px}main{padding-bottom:40px}}