:root{--bg:#07111f;--panel:#0e1d31;--panel2:#132741;--text:#eef6ff;--muted:#9fb4c9;--line:#29425f;--blue:#53a7ff;--green:#55d68b;--yellow:#ffcf5a;--red:#ff7e86;--shadow:0 18px 55px rgba(0,0,0,.25)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:radial-gradient(circle at 15% -10%,rgba(83,167,255,.16),transparent 32%),var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.55}button,input,select{font:inherit}.splash{min-height:100vh;display:grid;place-items:center;color:var(--muted)}
.shell{width:min(1160px,calc(100% - 28px));margin:auto}.topbar{position:sticky;top:0;z-index:20;background:rgba(7,17,31,.9);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}.topbar .shell{display:flex;align-items:center;gap:14px;padding:12px 0}.brand{font-weight:1000;letter-spacing:.08em;text-transform:uppercase}.brand span{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:11px;background:linear-gradient(135deg,var(--blue),var(--green));color:#07111f;margin-right:9px}.spacer{flex:1}.nav{display:flex;gap:7px;flex-wrap:wrap}.nav button{background:transparent;border:0;color:var(--muted);font-weight:800;padding:9px 11px;border-radius:10px;cursor:pointer}.nav button:hover{background:#132740;color:white}.userchip{font-size:.9rem;color:#cfe1f2}
main{padding:34px 0 70px}.eyebrow{color:var(--green);font-weight:900;text-transform:uppercase;letter-spacing:.12em;font-size:.75rem}.hero{display:flex;align-items:end;justify-content:space-between;gap:18px;flex-wrap:wrap;margin-bottom:22px}h1{font-size:clamp(2.1rem,5vw,4rem);line-height:1;margin:.35rem 0 .7rem;letter-spacing:-.045em}h2{font-size:clamp(1.45rem,3vw,2.2rem);letter-spacing:-.025em;margin:.2rem 0 .7rem}h3{margin:.15rem 0 .5rem}.muted{color:var(--muted)}
.card{background:linear-gradient(180deg,rgba(19,39,65,.96),rgba(12,28,48,.96));border:1px solid var(--line);border-radius:19px;box-shadow:var(--shadow)}.pad{padding:22px}.grid{display:grid;gap:16px}.grid3{grid-template-columns:repeat(3,1fr)}.grid2{grid-template-columns:repeat(2,1fr)}
.btn{border:1px solid var(--line);background:#17304e;color:white;padding:11px 15px;border-radius:12px;font-weight:850;cursor:pointer}.btn:hover{border-color:#5c82aa}.btn.primary{background:linear-gradient(135deg,var(--blue),#327ecc);border-color:transparent}.btn.green{background:linear-gradient(135deg,var(--green),#35b874);border-color:transparent;color:#07140c}.btn.ghost{background:transparent}.actions{display:flex;gap:9px;flex-wrap:wrap;margin-top:14px}
.login-wrap{min-height:100vh;display:grid;place-items:center;padding:24px}.login-card{width:min(520px,100%);padding:28px}.login-card h1{font-size:2.5rem}.field{display:grid;gap:6px;margin:14px 0}.field label{font-size:.85rem;font-weight:800;color:#bdd1e4}.field input,.field select{width:100%;padding:12px 13px;border-radius:11px;border:1px solid var(--line);background:#081727;color:white;outline:none}.field input:focus,.field select:focus{border-color:var(--blue)}.error{padding:11px 13px;background:rgba(255,126,134,.1);border:1px solid rgba(255,126,134,.45);border-radius:11px;color:#ffc3c7}.success{padding:11px 13px;background:rgba(85,214,139,.1);border:1px solid rgba(85,214,139,.45);border-radius:11px;color:#baf2ce}
.student-card,.course-card,.unit-card{padding:20px;cursor:pointer;transition:.16s transform,.16s border}.student-card:hover,.course-card:hover,.unit-card:hover{transform:translateY(-2px);border-color:#4b789f}.avatar{width:52px;height:52px;border-radius:16px;display:grid;place-items:center;background:#183b5d;color:#9ed2ff;font-weight:1000;font-size:1.2rem}.row{display:flex;align-items:center;gap:13px}.between{justify-content:space-between}.metric{font-size:2.2rem;font-weight:1000;letter-spacing:-.05em}.small{font-size:.86rem}.badge{display:inline-flex;border:1px solid var(--line);border-radius:999px;padding:5px 9px;color:#cfe3f5;font-size:.78rem;font-weight:800}.badge.live{border-color:rgba(85,214,139,.45);color:#aaf0c3}.progress{height:10px;background:#071421;border:1px solid #243c57;border-radius:999px;overflow:hidden}.progress span{display:block;height:100%;background:linear-gradient(90deg,var(--blue),var(--green))}
.empty{padding:28px;text-align:center;color:var(--muted)}.section{margin-top:28px}.study{padding:22px;margin-top:14px}.study ul{padding-left:20px}.study li{margin:6px 0}.equation{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:#081725;border:1px solid var(--line);border-radius:12px;padding:11px 13px;margin:8px 0;overflow:auto}.memory{margin-top:12px;padding:12px;border-left:4px solid var(--yellow);background:#111c28;color:#f3e1ab;border-radius:10px}
.topic-row{display:grid;grid-template-columns:1fr auto;gap:12px;align-items:center;padding:13px 0;border-bottom:1px solid var(--line)}.topic-row:last-child{border-bottom:0}.score-good{color:#aaf1c2}.score-mid{color:#ffe69d}.score-bad{color:#ffb7bc}
.quiz-wrap{max-width:860px;margin:auto}.quiz-head{padding:18px;margin-bottom:14px}.qcard{padding:24px}.qtext{font-size:clamp(1.2rem,3vw,1.65rem);font-weight:900;line-height:1.3;margin:13px 0 18px}.options{display:grid;gap:10px}.option{width:100%;text-align:left;display:flex;gap:11px;border:1px solid var(--line);background:#0a1a2b;color:white;padding:13px;border-radius:13px;cursor:pointer}.option:hover,.option.selected{border-color:var(--blue);background:rgba(83,167,255,.09)}.option.correct{border-color:var(--green);background:rgba(85,214,139,.09)}.option.wrong{border-color:var(--red);background:rgba(255,126,134,.09)}.letter{width:30px;height:30px;flex:0 0 30px;display:grid;place-items:center;border-radius:9px;background:#17324e;font-weight:1000}.feedback{margin-top:14px;padding:13px;border-radius:12px;background:#081725;border:1px solid var(--line)}
.table{width:100%;border-collapse:collapse}.table th,.table td{text-align:left;padding:11px;border-bottom:1px solid var(--line);vertical-align:top}.table th{color:#bcd0e2;font-size:.82rem;text-transform:uppercase;letter-spacing:.05em}.account-form{padding:20px;margin-top:18px}.footer-note{margin-top:35px;color:#7892a9;font-size:.82rem}
@media(max-width:850px){.grid3,.grid2{grid-template-columns:1fr}.topbar .shell{align-items:flex-start}.nav{display:none}.hero{align-items:flex-start}.table{font-size:.86rem}.topic-row{grid-template-columns:1fr}}