:root{
  --bg:#08111f;--bg2:#0d1728;--panel:#111d31;--panel2:#17263e;--line:#283a56;
  --text:#eef5ff;--muted:#9fb0c9;--blue:#49b8ff;--green:#42d392;--amber:#f5b942;--red:#ff6b6b;
  --shadow:0 14px 40px rgba(0,0,0,.28)
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:linear-gradient(180deg,var(--bg),#0b1322 55%,#07101d);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
button,input,select{font:inherit}
button{cursor:pointer}
.shell{display:grid;grid-template-columns:260px minmax(0,1fr);min-height:100vh}
.sidebar{background:rgba(7,16,29,.95);border-right:1px solid var(--line);padding:22px 18px;position:sticky;top:0;height:100vh;overflow:auto}
.brand{font-weight:900;font-size:21px;letter-spacing:-.3px;margin:2px 8px 20px}
.brand b{color:var(--blue)}
.brand small{display:block;color:var(--muted);font-size:11px;font-weight:600;margin-top:4px;letter-spacing:.5px}
.navbtn{width:100%;border:1px solid transparent;background:transparent;color:var(--text);padding:11px 12px;border-radius:11px;text-align:left;margin:3px 0}
.navbtn:hover,.navbtn.active{background:var(--panel2);border-color:var(--line)}
.side-stat{margin:20px 8px 0;padding-top:16px;border-top:1px solid var(--line);color:var(--muted);font-size:12px;line-height:1.6}
.main{width:100%;max-width:1180px;margin:0 auto;padding:30px 32px 60px}
h1{font-size:34px;letter-spacing:-1px;margin:0 0 6px} h2{margin:0 0 12px;font-size:22px} h3{margin:0 0 8px}
.subtitle,.muted{color:var(--muted)}
.subtitle{margin-bottom:22px}
.grid{display:grid;gap:16px}.g4{grid-template-columns:repeat(4,minmax(0,1fr))}.g3{grid-template-columns:repeat(3,minmax(0,1fr))}.g2{grid-template-columns:repeat(2,minmax(0,1fr))}
.card{background:linear-gradient(180deg,rgba(17,29,49,.96),rgba(13,23,40,.98));border:1px solid var(--line);border-radius:17px;padding:18px;box-shadow:var(--shadow)}
.metric{font-size:30px;font-weight:900;margin-top:5px}.tiny{font-size:12px}.small{font-size:14px}
.btn{border:0;border-radius:10px;padding:10px 14px;background:var(--blue);color:#03121f;font-weight:850}
.btn:hover{filter:brightness(1.08)}.btn.secondary{background:var(--panel2);border:1px solid var(--line);color:var(--text)}.btn.good{background:var(--green);color:#03180e}.btn.warn{background:var(--amber);color:#221600}.btn.danger{background:var(--red);color:#260303}
.row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.between{justify-content:space-between}
.pill{display:inline-flex;align-items:center;gap:5px;padding:4px 8px;border:1px solid var(--line);border-radius:999px;color:var(--muted);font-size:12px;background:#091525}
.progress{height:10px;border-radius:999px;background:#07111e;border:1px solid var(--line);overflow:hidden}.progress span{display:block;height:100%;background:linear-gradient(90deg,var(--blue),var(--green))}
.module{margin-bottom:14px}.modulehead{display:flex;gap:12px;justify-content:space-between;align-items:flex-start}.lesson{margin:10px 0;padding:14px;border-radius:12px;background:#0b1728;border:1px solid #21344f}.lesson.done{border-color:#2d795d}
.callout{padding:12px 14px;background:#091525;border-left:4px solid var(--blue);border-radius:8px;margin-top:10px;color:#dbeaff}
.choice{display:block;width:100%;padding:13px 14px;text-align:left;background:#0a1525;color:var(--text);border:1px solid var(--line);border-radius:11px;margin:8px 0}
.choice:hover{border-color:var(--blue)}.choice.correct{border-color:var(--green);background:rgba(66,211,146,.1)}.choice.wrong{border-color:var(--red);background:rgba(255,107,107,.1)}.choice:disabled{cursor:default}
.question{font-size:20px;line-height:1.45;margin:6px 0 18px}
.feedback{margin-top:16px;padding:15px;background:#091525;border-radius:11px;border:1px solid var(--line)}
.toolbar{display:flex;gap:9px;flex-wrap:wrap;margin-bottom:18px}
select,input{background:#0a1525;border:1px solid var(--line);color:var(--text);padding:10px;border-radius:10px}
.search{min-width:260px}
.topicrow{padding:12px 0;border-bottom:1px solid var(--line)}.topicrow:last-child{border-bottom:0}
.flash{min-height:250px;display:flex;justify-content:center;align-items:center;text-align:center;font-size:24px;font-weight:800;padding:28px;cursor:pointer;user-select:none}
table{width:100%;border-collapse:collapse}th,td{padding:10px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}th{color:#cbd9ed;font-size:12px;text-transform:uppercase;letter-spacing:.5px}
.timer{font-weight:900;color:var(--amber)}.scoregood{color:var(--green)}.scorewarn{color:var(--amber)}.scorebad{color:var(--red)}
.graphwrap{display:flex;justify-content:center;padding:10px 0 18px}.econgraph{max-width:440px;width:100%;height:auto;background:#f7fbff;border-radius:10px}
.check{accent-color:var(--green);width:18px;height:18px}
.note{font-size:13px;color:var(--muted);line-height:1.55}
hr{border:0;border-top:1px solid var(--line);margin:18px 0}
.banner{padding:12px 14px;border-radius:11px;background:rgba(73,184,255,.08);border:1px solid rgba(73,184,255,.28);margin-bottom:18px}
@media(max-width:900px){.shell{grid-template-columns:1fr}.sidebar{position:static;height:auto;border-right:0;border-bottom:1px solid var(--line)}.nav{display:flex;gap:6px;overflow:auto}.navbtn{width:auto;white-space:nowrap}.side-stat{display:none}.main{padding:22px 16px 50px}.g4,.g3,.g2{grid-template-columns:1fr 1fr}}
@media(max-width:600px){.g4,.g3,.g2{grid-template-columns:1fr}h1{font-size:29px}.search{min-width:100%}}