:root{--n:#0b1f3a;--b:#2463eb;--bg:#f5f7fb;--i:#172033;--m:#667085;--l:#dbe2ec;--g:#16794a;--p:#6941c6}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--i);font-family:system-ui,-apple-system,"Segoe UI",Arial,sans-serif}header{height:68px;background:var(--n);color:#fff;display:flex;align-items:center;gap:12px;padding:10px max(18px,calc((100% - 1180px)/2));position:sticky;top:0;z-index:9}.brand{color:#fff;text-decoration:none;font-weight:900;font-size:1.2rem;display:flex;gap:9px;align-items:center}.brand b{width:38px;height:38px;background:#fff;color:var(--n);display:grid;place-items:center;border-radius:12px}nav{margin-left:auto}nav a{color:#dbe6f5;text-decoration:none;padding:10px;font-weight:700}header button{background:transparent;color:#fff;border:1px solid #66758c;border-radius:10px;padding:9px 12px;font-weight:750}main{max-width:1180px;margin:auto;padding:25px 18px 90px}footer{max-width:1180px;margin:auto;padding:18px;color:var(--m)}.hero{background:linear-gradient(135deg,var(--n),#185083);color:#fff;padding:30px;border-radius:23px}.hero h1{font-size:clamp(2rem,5vw,3rem);margin:.4rem 0}.hero p{color:#dce7f5}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:45px;border:1px solid var(--l);border-radius:11px;padding:9px 14px;background:#fff;color:var(--n);font-weight:800;text-decoration:none;cursor:pointer}.btn.primary{background:var(--b);color:#fff;border-color:var(--b)}.btn:disabled{opacity:.55}.card{background:#fff;border:1px solid var(--l);border-radius:16px;padding:18px}.grid{display:grid;grid-template-columns:repeat(12,1fr);gap:15px;margin-top:17px}.stat{font-size:2rem;font-weight:900;color:var(--n)}.muted{color:var(--m)}.top{display:flex;justify-content:space-between;gap:15px}.tabs{display:flex;gap:7px;flex-wrap:wrap;margin:12px 0}.tab{padding:9px 13px;background:#fff;color:var(--n);border:1px solid var(--l);border-radius:11px;text-decoration:none;font-weight:800}.tab.active{background:var(--n);color:#fff}.tab.subject.active{background:var(--b);border-color:var(--b)}.workspace{display:grid;grid-template-columns:300px 1fr;gap:16px}.side,.panel{background:#fff;border:1px solid var(--l);border-radius:16px;overflow:hidden}.side h3{margin:0;background:var(--n);color:#fff;padding:14px}.search{padding:9px}.field{width:100%;padding:10px;border:1px solid var(--l);border-radius:10px}.list{padding:6px;max-height:620px;overflow:auto}.chapter{display:flex;gap:9px;align-items:center;padding:10px;border-radius:10px;color:var(--i);text-decoration:none}.chapter.active,.chapter:hover{background:#edf3ff}.chapter b{min-width:34px;height:34px;display:grid;place-items:center;background:#edf1f6;border-radius:9px}.chapter.active b{background:var(--b);color:#fff}.chapter small{display:block;color:var(--m)}.panel{padding:19px}.setgrid{display:grid;grid-template-columns:repeat(5,minmax(120px,1fr));gap:10px}.set{border:1px solid var(--l);border-radius:13px;padding:11px}.set h4{min-height:38px;margin:9px 0}.badge{display:inline-block;padding:4px 7px;border-radius:99px;background:#f1eafe;color:var(--p);font-size:.7rem;font-weight:800}.ready .badge{background:#e8f7ef;color:var(--g)}.set .btn{width:100%;font-size:.8rem}.exam-banner{padding:15px;border-radius:14px;background:#edf3ff;border:1px solid #cbdcff;margin-bottom:15px}.question{max-width:820px;margin:auto}.bar{height:9px;background:#e5eaf1;border-radius:99px}.bar i{display:block;height:100%;background:var(--b)}.q{font-size:1.25rem;font-weight:750;margin:20px 0}.option{display:block;width:100%;padding:13px;margin:9px 0;text-align:left;border:2px solid var(--l);border-radius:12px;background:#fff}.option.selected{border-color:var(--b)}.option.correct{border-color:var(--g);background:#e8f7ef}.option.wrong{border-color:#b42335;background:#fff0f2}.explain{padding:15px;background:#edf3ff;border-radius:13px;margin-top:14px}.modalbg{position:fixed;inset:0;background:#07172db8;display:grid;place-items:center;padding:18px;z-index:20}.modalbox{width:min(500px,100%);background:#fff;padding:20px;border-radius:17px}.profile{display:flex;justify-content:space-between;gap:8px;margin:7px 0;padding:8px;border:1px solid var(--l);border-radius:10px}.table{width:100%;border-collapse:collapse}.table th,.table td{border:1px solid var(--l);padding:8px}.table th{background:var(--n);color:#fff}@media(max-width:900px){.workspace{display:block}.side{margin-bottom:14px}.setgrid{grid-template-columns:repeat(3,1fr)}}@media(max-width:650px){nav{display:none}main{padding:18px 12px 80px}.top{display:block}.tabs.forms{display:grid;grid-template-columns:repeat(5,1fr)}.tabs.subjects{display:grid;grid-template-columns:1fr 1fr}.tab{text-align:center;padding:9px 3px}.setgrid{grid-template-columns:1fr 1fr}.grid>*{grid-column:span 12!important}.btn{width:100%}}