:root{
  --bg:#090d12;--panel:#111821;--panel2:#16212c;--panel3:#0d141c;--line:#263646;
  --text:#edf4fb;--muted:#93a6b8;--accent:#5bd2ff;--accent2:#7ee0ff;--good:#57d68d;
  --bad:#ff6b79;--warn:#ffc857;--purple:#b9a1ff;--shadow:0 18px 60px rgba(0,0,0,.32)
}
*{box-sizing:border-box} html{scroll-behavior:smooth}
body{margin:0;background:
  radial-gradient(circle at 15% -10%,#123047 0,transparent 30%),
  radial-gradient(circle at 90% 0%,#1b1836 0,transparent 24%),
  var(--bg);color:var(--text);
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;min-height:100vh}
button,input{font:inherit}.app{max-width:1320px;margin:auto;padding:24px}
.topbar{display:flex;justify-content:space-between;align-items:center;gap:18px;margin-bottom:18px}
.brand{display:flex;align-items:center;gap:12px}.brandmark{width:48px;height:48px;border-radius:14px;
  display:grid;place-items:center;font-weight:900;letter-spacing:-.06em;background:linear-gradient(180deg,#84e5ff,#47bde8);color:#051019}
.brand h1{margin:0;font-size:clamp(22px,3vw,34px);letter-spacing:-.04em}.brand p{margin:3px 0 0;color:var(--muted)}
.topactions{display:flex;align-items:center;gap:10px}.bankbadge{border:1px solid var(--line);background:#0d141c;border-radius:999px;padding:8px 12px;color:var(--muted);font-size:12px}
.tabs{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 18px;padding:6px;border:1px solid var(--line);background:#0b1118;border-radius:14px}
.tab{border:0;background:transparent;color:var(--muted);padding:10px 14px;border-radius:10px;cursor:pointer;font-weight:700}
.tab:hover{color:var(--text);background:#121b24}.tab.active{background:#193142;color:var(--text);box-shadow:inset 0 0 0 1px #2e5168}
.view{display:block}.hidden{display:none!important}
.card{background:linear-gradient(180deg,rgba(22,33,44,.97),rgba(15,22,30,.97));border:1px solid var(--line);border-radius:18px;padding:20px;box-shadow:var(--shadow)}
.hero{display:grid;grid-template-columns:1fr auto;gap:20px;align-items:center;border:1px solid #2d4c61;border-radius:20px;padding:24px;margin-bottom:18px;background:
  linear-gradient(135deg,rgba(29,70,94,.58),rgba(20,25,38,.9))}
.hero h2,.section-head h2{font-size:clamp(24px,3.5vw,40px);letter-spacing:-.035em;margin:6px 0 8px}.hero p,.section-head p{max-width:850px;color:var(--muted);line-height:1.6;margin:0}
.heroactions{display:flex;flex-direction:column;gap:10px;min-width:220px}.eyebrow{font-size:11px;text-transform:uppercase;letter-spacing:.16em;color:var(--accent);font-weight:900}
.primary,.secondary,.danger,.ghost{border-radius:12px;padding:11px 15px;cursor:pointer;font-weight:800;transition:.14s}
.primary{border:0;background:var(--accent);color:#051019}.primary:hover{filter:brightness(1.08);transform:translateY(-1px)}
.secondary{background:#1b2a36;color:var(--text);border:1px solid var(--line)}.secondary:hover{border-color:#44637a;background:#213343}
.danger{background:#331921;color:#ffd7dc;border:1px solid #5e2b37}.danger:hover{background:#44202a}
.ghost{background:transparent;color:var(--muted);border:1px solid var(--line)}.small{padding:7px 10px;font-size:12px}
.study-layout{display:grid;grid-template-columns:320px 1fr;gap:18px;align-items:start}.lesson-sidebar{position:sticky;top:14px}
.sidebar-head{display:flex;justify-content:space-between;align-items:center;gap:12px}.sidebar-head h3{margin:4px 0 0}
.ring{width:54px;height:54px;border-radius:50%;display:grid;place-items:center;background:conic-gradient(var(--accent) var(--pct,0%),#1b2a36 0);position:relative}
.ring:after{content:"";position:absolute;inset:5px;background:#111821;border-radius:50%}.ring span{position:relative;z-index:1;font-size:11px;font-weight:900}
.search{width:100%;margin:14px 0;border:1px solid var(--line);background:#0b1219;color:var(--text);border-radius:11px;padding:10px 12px;outline:none}
.search:focus{border-color:var(--accent)}
.lesson-list{display:grid;gap:7px}.lesson-item{display:grid;grid-template-columns:36px 1fr auto;gap:10px;align-items:center;width:100%;text-align:left;border:1px solid transparent;background:#0d141c;color:var(--text);border-radius:12px;padding:10px;cursor:pointer}
.lesson-item:hover{border-color:#38566d}.lesson-item.active{border-color:var(--accent);background:#132330}.lesson-item.done{box-shadow:inset 3px 0 0 var(--good)}
.lesson-num{font-weight:900;color:var(--accent);font-size:12px}.lesson-item b{display:block;font-size:13px}.lesson-item small{display:block;color:var(--muted);font-size:11px;margin-top:2px}.lesson-check{color:var(--good);font-weight:900}
.lesson-pane{min-height:720px}.lesson-head{display:flex;justify-content:space-between;align-items:flex-start;gap:18px;border-bottom:1px solid var(--line);padding-bottom:16px;margin-bottom:18px}
.lesson-head h2{font-size:clamp(28px,4vw,44px);letter-spacing:-.04em;margin:5px 0 6px}.lesson-sub{color:var(--muted);font-size:16px}.lesson-actions{display:flex;gap:9px;flex-wrap:wrap;justify-content:flex-end}
.lesson-body{font-size:16px;line-height:1.67}.lesson-body h3{font-size:21px;margin:28px 0 10px;letter-spacing:-.02em}.lesson-body p{color:#dce8f2}
.lesson-body ul,.lesson-body ol{padding-left:22px}.lesson-body li{margin:7px 0;color:#dce8f2}
.callout{border-left:3px solid var(--accent);background:#10202a;padding:13px 15px;border-radius:10px;margin:14px 0;color:#dcecf6}
.callout.warn{border-left-color:var(--warn);background:#211c11;color:#eadfbd}.callout.rescue{border-left-color:var(--purple);background:#18162b}
.memoryhero{border:1px solid #2e5e78;background:#0e2632;border-radius:14px;padding:15px 17px;font-size:17px;font-weight:900;letter-spacing:.01em;margin:16px 0}
.factgrid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin:14px 0}.fact{background:#0d141c;border:1px solid var(--line);border-radius:12px;padding:12px}.fact b{display:block;font-size:18px;color:var(--accent2);margin-bottom:3px}.fact span{font-size:12px;color:var(--muted)}
table{width:100%;border-collapse:separate;border-spacing:0;margin:12px 0 18px;border:1px solid var(--line);border-radius:12px;overflow:hidden;background:#0c131a}
th,td{padding:10px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}th{background:#152330;color:#b9d5e6;font-size:12px;text-transform:uppercase;letter-spacing:.06em}td{color:#dce8f2}tr:last-child td{border-bottom:0}.dense td,.dense th{padding:8px 9px;font-size:13px}
.timeline{display:grid;gap:10px;margin:14px 0}.timeline>div{display:grid;grid-template-columns:130px 1fr;gap:14px;border-left:3px solid #385f75;padding:8px 12px;background:#0d141c;border-radius:0 10px 10px 0}.timeline b{color:var(--accent2)}.timeline span{color:#dbe7ef}
.cycleline{padding:16px;border:1px solid #2e5f77;border-radius:12px;background:#0e2330;text-align:center;font-size:18px;margin:12px 0}
.sourcebar{display:flex;gap:7px;flex-wrap:wrap;padding-top:18px;margin-top:24px;border-top:1px solid var(--line)}.sourcechip{display:inline-flex;align-items:center;gap:5px;border:1px solid var(--line);border-radius:999px;padding:6px 9px;color:var(--muted);font-size:11px;text-decoration:none;background:#0d141c}.sourcechip:hover{color:var(--text);border-color:#48657a}
.section-head{display:flex;justify-content:space-between;gap:18px;align-items:flex-end;margin-bottom:18px}.modeblock{display:flex;align-items:center;gap:9px}.seg{display:inline-flex;border:1px solid var(--line);border-radius:12px;overflow:hidden}.seg button{border:0;background:#0d141c;color:var(--muted);padding:9px 13px;cursor:pointer}.seg button.active{background:#193142;color:var(--text)}
.practice-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:18px}.exam-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:11px}.exam-card{cursor:pointer;border:1px solid var(--line);background:#0e151d;border-radius:14px;padding:14px;text-align:left;color:var(--text);transition:.15s}
.exam-card:hover{transform:translateY(-1px);border-color:#3f617a;background:#121d27}.exam-card.active{border-color:var(--accent);box-shadow:0 0 0 1px rgba(91,210,255,.2) inset}.exam-card b{display:block;margin-bottom:4px}.exam-card small{color:var(--muted);line-height:1.4}
.row{display:flex;gap:9px;flex-wrap:wrap;align-items:center}.padtop{margin-top:16px}.bankline,.muted{color:var(--muted)}.bankline{font-size:13px}.notice{border-left:3px solid var(--warn);background:#201b11;padding:12px 14px;border-radius:10px;color:#e8dbb6;font-size:14px}.priority li{margin:9px 0}
.cram-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.cram-card h3{margin-top:0}.cram-card.full{grid-column:1/-1}.flashgrid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.flash{background:#0d141c;border:1px solid var(--line);border-radius:12px;padding:12px}.flash b{font-size:18px;color:var(--accent2);display:block}.flash span{font-size:12px;color:var(--muted)}
.statrow{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.stat strong{display:block;font-size:30px}.stat span{color:var(--muted);font-size:12px}.progress-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:18px}
.weak{display:grid;gap:8px}.weak-item{display:flex;justify-content:space-between;gap:12px;background:#0d141c;border:1px solid var(--line);padding:10px 12px;border-radius:10px}.weak-item span:last-child,.weak-item b{white-space:nowrap}
.exam-shell{display:grid;grid-template-columns:1fr 270px;gap:18px}.exam-head{display:flex;justify-content:space-between;gap:14px;align-items:flex-start;margin-bottom:18px}.exam-head-actions{text-align:right}.timer{font-variant-numeric:tabular-nums;font-weight:900;font-size:18px}
.progressbar{height:7px;background:#0b1016;border-radius:999px;overflow:hidden;border:1px solid #1e2b37}.progressbar>i{display:block;height:100%;background:var(--accent);width:0}
.qtitle{font-size:22px;line-height:1.4;margin:18px 0 14px}.choices{display:grid;gap:10px}.choice{display:flex;align-items:flex-start;gap:12px;width:100%;text-align:left;background:#0d141c;border:1px solid var(--line);color:var(--text);border-radius:13px;padding:14px;cursor:pointer;transition:.12s}
.choice:hover{border-color:#48647a;background:#111c26}.choice.selected{border-color:var(--accent);background:#122331}.choice.good{border-color:var(--good);background:#10241b}.choice.bad{border-color:var(--bad);background:#2a151a}.letter{display:inline-flex;align-items:center;justify-content:center;width:27px;height:27px;border-radius:8px;background:#1b2a36;font-weight:900;flex:0 0 auto}
.feedback{margin-top:14px;border-radius:12px;padding:14px;border:1px solid var(--line);background:#0c131a}.feedback.good{border-color:#2e6947}.feedback.bad{border-color:#71323c}.feedback h4{margin:0 0 6px}.source{font-size:12px;margin-top:9px}.source a{color:var(--accent)}
.controls{display:flex;justify-content:space-between;gap:10px;margin-top:18px}.side{position:sticky;top:14px;height:max-content}.qnav{display:grid;grid-template-columns:repeat(5,1fr);gap:7px;max-height:460px;overflow:auto;padding-right:3px}.qdot{border:1px solid var(--line);background:#0d141c;color:var(--muted);border-radius:8px;padding:7px 0;cursor:pointer;font-size:12px}.qdot.current{border-color:var(--accent);color:var(--text)}.qdot.answered{background:#183044;color:var(--text)}.qdot.flagged{outline:1px solid var(--warn)}
.result-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:16px 0}.result-card{border:1px solid var(--line);background:#0d141c;border-radius:14px;padding:14px}.result-card.pass{border-color:#2d6b47}.result-card.fail{border-color:#71323c}.result-card strong{font-size:26px;display:block}
.review{margin-top:12px;border-top:1px solid var(--line);padding-top:12px}.review details{background:#0d141c;border:1px solid var(--line);border-radius:12px;padding:10px 12px;margin:8px 0}.review summary{cursor:pointer;font-weight:800}
.footer{margin-top:22px;color:var(--muted);font-size:12px;line-height:1.55}.footer p{margin:6px 0}
@media(max-width:1050px){.study-layout,.practice-grid,.exam-shell{grid-template-columns:1fr}.lesson-sidebar,.side{position:static}.lesson-list{grid-template-columns:repeat(2,minmax(0,1fr))}.cram-grid{grid-template-columns:1fr}.cram-card.full{grid-column:auto}}
@media(max-width:760px){.app{padding:14px}.topbar,.section-head,.lesson-head{align-items:flex-start;flex-direction:column}.topactions{width:100%;justify-content:space-between}.bankbadge{font-size:10px}.hero{grid-template-columns:1fr}.heroactions{min-width:0}.exam-grid,.lesson-list,.statrow,.progress-grid,.factgrid,.flashgrid{grid-template-columns:1fr 1fr}.cram-grid{grid-template-columns:1fr}.lesson-pane{padding:15px}.dense{display:block;overflow:auto}.timeline>div{grid-template-columns:1fr}.result-grid{grid-template-columns:1fr 1fr}}
@media(max-width:480px){.exam-grid,.lesson-list,.statrow,.progress-grid,.factgrid,.flashgrid,.result-grid{grid-template-columns:1fr}.topactions{align-items:flex-start;flex-direction:column}.tabs{display:grid;grid-template-columns:1fr 1fr}.controls{align-items:stretch;flex-direction:column}.controls>.row{justify-content:flex-end}.qnav{grid-template-columns:repeat(8,1fr)}}