:root{
  --bg:#07111f;
  --bg2:#0d1830;
  --panel:rgba(255,255,255,.075);
  --panel-strong:rgba(255,255,255,.105);
  --line:rgba(255,255,255,.12);
  --text:#f8fafc;
  --muted:#aebbd0;
  --blue:#5da8ff;
  --violet:#9c7cff;
  --green:#38d996;
  --red:#ff727b;
  --yellow:#ffd166;
  --sidebar:252px;
  --radius:20px;
  --shadow:0 18px 50px rgba(0,0,0,.26);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;min-height:100vh;color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;background:radial-gradient(circle at 10% 0%,rgba(93,168,255,.18),transparent 28%),radial-gradient(circle at 95% 10%,rgba(156,124,255,.15),transparent 27%),linear-gradient(145deg,var(--bg),var(--bg2));}
a{color:inherit}.icon{width:20px;height:20px;flex:0 0 auto}.sidebar{position:fixed;inset:0 auto 0 0;width:var(--sidebar);padding:22px 16px;display:flex;flex-direction:column;background:rgba(5,12,25,.9);border-right:1px solid var(--line);backdrop-filter:blur(18px);z-index:50}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;padding:3px 8px 20px}.brand-mark{width:44px;height:44px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,rgba(93,168,255,.4),rgba(156,124,255,.35));border:1px solid rgba(255,255,255,.16);box-shadow:0 10px 26px rgba(0,0,0,.2)}.brand-mark .icon{width:25px;height:25px}.brand strong{display:block;font-size:20px;letter-spacing:.2px}.brand small{display:block;color:var(--muted);margin-top:2px;font-size:11px}.nav-label{padding:8px 12px;color:#71809a;text-transform:uppercase;letter-spacing:.12em;font-size:10px;font-weight:800}.side-nav{display:grid;gap:6px}.side-nav a{display:flex;align-items:center;gap:11px;padding:11px 12px;border-radius:13px;text-decoration:none;color:#bcc8da;border:1px solid transparent;font-weight:650;font-size:14px;transition:.18s ease}.side-nav a:hover{background:rgba(255,255,255,.06);color:#fff}.side-nav a.active{background:linear-gradient(135deg,rgba(93,168,255,.2),rgba(156,124,255,.14));border-color:rgba(93,168,255,.28);color:#fff}.sidebar-tip{margin-top:auto;padding:14px;border-radius:16px;border:1px solid var(--line);background:rgba(255,255,255,.045);display:flex;gap:10px;color:var(--muted)}.sidebar-tip .icon{color:var(--yellow)}.sidebar-tip strong{display:block;color:#fff;font-size:12px}.sidebar-tip span{display:block;margin-top:4px;font-size:11px;line-height:1.45}.app-shell{margin-left:var(--sidebar);min-height:100vh}.topbar{min-height:84px;padding:17px 28px;display:flex;align-items:center;gap:16px;border-bottom:1px solid var(--line);background:rgba(7,17,31,.68);backdrop-filter:blur(16px);position:sticky;top:0;z-index:30}.page-title{min-width:0;flex:1}.page-title h1{margin:0;font-size:22px}.page-title p{margin:4px 0 0;color:var(--muted);font-size:13px}.mobile-menu{display:none}.top-home,.mobile-menu{align-items:center;gap:8px;border:1px solid var(--line);background:rgba(255,255,255,.065);color:#fff;border-radius:12px;padding:10px 13px;text-decoration:none;font:inherit;cursor:pointer}.page-content{width:min(1280px,calc(100% - 40px));margin:0 auto;padding:26px 0 36px}.site-footer{color:#71809a;text-align:center;padding:0 20px 24px;font-size:12px}.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);backdrop-filter:blur(12px)}.eyebrow{display:inline-flex;align-items:center;gap:7px;color:#cfe5ff;text-transform:uppercase;letter-spacing:.1em;font-size:10px;font-weight:850}.eyebrow .icon{width:15px;height:15px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:42px;padding:10px 14px;border:1px solid var(--line);border-radius:12px;background:rgba(255,255,255,.075);color:#fff;text-decoration:none;cursor:pointer;font:inherit;font-weight:700;transition:.18s ease}.btn:hover{transform:translateY(-1px);background:rgba(255,255,255,.11)}.btn.primary{background:linear-gradient(135deg,rgba(93,168,255,.42),rgba(156,124,255,.34));border-color:rgba(93,168,255,.4)}.btn.danger{background:rgba(255,114,123,.12);border-color:rgba(255,114,123,.3)}.btn .icon{width:17px;height:17px}.hero{padding:30px;display:grid;grid-template-columns:minmax(0,1.2fr) minmax(300px,.8fr);gap:26px;align-items:center}.hero h2{font-size:clamp(28px,4vw,48px);line-height:1.05;margin:12px 0}.hero p{color:var(--muted);font-size:16px;line-height:1.65;margin:0 0 22px}.hero-actions{display:flex;gap:10px;flex-wrap:wrap}.hero-visual{min-height:220px;border:1px solid var(--line);border-radius:18px;background:linear-gradient(145deg,rgba(93,168,255,.14),rgba(156,124,255,.09));display:grid;place-items:center;position:relative;overflow:hidden}.hero-equation{font-size:clamp(42px,7vw,76px);font-weight:900;letter-spacing:.03em}.hero-bubble{position:absolute;padding:8px 12px;border-radius:999px;background:rgba(7,17,31,.78);border:1px solid var(--line);font-size:12px}.hero-bubble.one{top:20px;left:18px}.hero-bubble.two{right:18px;bottom:20px}.dashboard-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-top:18px}.activity-card{padding:20px;text-decoration:none;transition:.2s ease;display:flex;flex-direction:column;min-height:190px}.activity-card:hover{transform:translateY(-3px);border-color:rgba(93,168,255,.35)}.activity-icon{width:48px;height:48px;border-radius:15px;display:grid;place-items:center;background:rgba(93,168,255,.15);border:1px solid rgba(93,168,255,.25)}.activity-icon .icon{width:26px;height:26px}.activity-card:nth-child(2) .activity-icon{background:rgba(56,217,150,.13);border-color:rgba(56,217,150,.25)}.activity-card:nth-child(3) .activity-icon{background:rgba(156,124,255,.14);border-color:rgba(156,124,255,.26)}.activity-card h3{margin:18px 0 7px;font-size:18px}.activity-card p{margin:0;color:var(--muted);font-size:13px;line-height:1.55}.activity-card .card-link{margin-top:auto;padding-top:18px;color:#dbeafe;font-weight:750;font-size:13px;display:flex;align-items:center;gap:6px}.quick-stats{margin-top:18px;padding:18px;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}.quick-stat{padding:14px;border-radius:14px;background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08)}.quick-stat span{display:block;color:var(--muted);font-size:11px}.quick-stat strong{display:block;margin-top:4px;font-size:22px}.tables-panel{margin-top:18px;padding:22px}.section-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;margin-bottom:18px}.section-heading h2{margin:0;font-size:20px}.section-heading p{margin:5px 0 0;color:var(--muted);font-size:13px}.table-filter{display:flex;gap:8px;align-items:flex-end;flex-wrap:wrap}.table-filter label{display:grid;gap:5px;color:var(--muted);font-size:11px}.table-filter select,.range-form select{background:#111d33;color:#fff;border:1px solid var(--line);border-radius:10px;padding:9px 30px 9px 10px;font:inherit}.table-tabs{display:flex;gap:8px;margin-bottom:16px}.table-tab{border:1px solid var(--line);background:rgba(255,255,255,.045);color:var(--muted);padding:9px 13px;border-radius:10px;cursor:pointer;font:inherit;font-weight:700}.table-tab.active{color:#fff;background:rgba(93,168,255,.17);border-color:rgba(93,168,255,.3)}.table-view{display:none}.table-view.active{display:block}.math-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px}.math-card{padding:14px;border-radius:16px;background:rgba(255,255,255,.045);border:1px solid rgba(255,255,255,.09)}.math-card h3{margin:0 0 10px;font-size:13px;color:#dbeafe}.math-lines{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13px;line-height:1.65;color:#cbd5e1}.math-lines b{color:#fff}.game-toolbar{padding:22px;display:flex;align-items:center;justify-content:space-between;gap:20px}.game-toolbar h2{margin:7px 0 4px;font-size:22px}.game-toolbar p{margin:0;color:var(--muted);font-size:13px}.inline-form{margin:0}.mode-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin-top:14px}.mode-form{margin:0}.mode-card{width:100%;height:100%;display:flex;align-items:flex-start;gap:11px;text-align:left;padding:15px;border-radius:16px;border:1px solid var(--line);background:rgba(255,255,255,.045);color:#fff;cursor:pointer;font:inherit;transition:.18s ease}.mode-card:hover{background:rgba(255,255,255,.075)}.mode-card.active{background:linear-gradient(135deg,rgba(93,168,255,.19),rgba(156,124,255,.12));border-color:rgba(93,168,255,.38)}.mode-icon{width:34px;height:34px;display:grid;place-items:center;border-radius:11px;background:rgba(255,255,255,.07)}.mode-icon .icon{width:18px;height:18px}.mode-card strong{display:block;font-size:13px}.mode-card small{display:block;color:var(--muted);font-size:10px;line-height:1.45;margin-top:4px}.settings-strip{margin-top:14px;padding:15px 18px;display:flex;align-items:center;justify-content:space-between;gap:14px}.range-form{display:flex;align-items:flex-end;gap:10px;flex-wrap:wrap}.range-form label{display:grid;gap:5px;color:var(--muted);font-size:10px}.range-badge{padding:8px 11px;border-radius:999px;background:rgba(255,255,255,.055);border:1px solid var(--line);font-size:12px;color:var(--muted)}.range-badge strong{color:#fff}.game-layout{display:grid;grid-template-columns:minmax(0,1.45fr) minmax(250px,.55fr);gap:14px;margin-top:14px}.game-arena{padding:28px;min-height:410px;display:flex;flex-direction:column;align-items:center;justify-content:center;position:relative}.test-line{position:absolute;top:16px;left:18px;right:18px;display:flex;align-items:center;gap:5px;color:var(--muted);font-size:12px}.test-score{margin-left:auto}.timer-track{position:absolute;top:0;left:0;right:0;height:5px;border-radius:20px 20px 0 0;overflow:hidden;background:rgba(255,255,255,.06)}.timer-track>div{height:100%;width:100%;background:linear-gradient(90deg,var(--green),var(--yellow),var(--red));transform-origin:left center}.question{display:flex;align-items:center;justify-content:center;gap:14px;font-size:clamp(52px,9vw,92px);font-weight:900;letter-spacing:.02em;line-height:1}.question .operator{color:var(--blue);font-weight:700}.question .equals{color:#8390a6}.answer-form{margin-top:28px;display:flex;gap:10px;align-items:center;justify-content:center;flex-wrap:wrap}.answer-form input{width:190px;text-align:center;font-size:30px;font-weight:850;padding:12px;border-radius:14px;border:1px solid rgba(255,255,255,.18);background:rgba(255,255,255,.07);color:#fff;outline:none}.answer-form input:focus{border-color:rgba(93,168,255,.65);box-shadow:0 0 0 4px rgba(93,168,255,.14)}.answer-button{min-height:58px;padding-inline:20px}.feedback{min-height:60px;margin-top:16px;width:min(520px,100%)}.feedback-box{padding:13px 16px;border-radius:13px;text-align:center;font-size:14px;border:1px solid var(--line)}.feedback-box.correct{background:rgba(56,217,150,.11);border-color:rgba(56,217,150,.3)}.feedback-box.wrong{background:rgba(255,114,123,.1);border-color:rgba(255,114,123,.3)}.skip-form{margin-top:5px}.text-button{border:0;background:transparent;color:var(--muted);font:inherit;font-size:12px;cursor:pointer;padding:8px}.text-button:hover{color:#fff}.game-stats{padding:21px}.game-stats h3{margin:0 0 15px;font-size:16px}.stat-list{display:grid;gap:8px}.stat-list>div{display:flex;align-items:center;justify-content:space-between;padding:11px 12px;border-radius:12px;background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.07)}.stat-list span{color:var(--muted);font-size:11px}.stat-list strong{font-size:18px}.good{color:var(--green)}.bad-text{color:var(--red)}.level-progress{margin-top:18px}.progress-head{display:flex;justify-content:space-between;color:var(--muted);font-size:11px;margin-bottom:8px}.progress-bar{height:8px;border-radius:999px;background:rgba(255,255,255,.08);overflow:hidden}.progress-bar>div{height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--blue),var(--violet));transition:width .25s ease}.history-panel{margin-top:14px;overflow:hidden}.history-panel summary{cursor:pointer;list-style:none;padding:17px 20px;font-weight:750;font-size:13px;display:flex;justify-content:space-between}.history-panel summary::-webkit-details-marker{display:none}.history-panel summary span{color:var(--muted)}.history-table-wrap{overflow:auto;border-top:1px solid var(--line)}table{width:100%;border-collapse:collapse}th,td{padding:11px 16px;text-align:left;border-bottom:1px solid rgba(255,255,255,.07);font-size:12px}th{color:var(--muted);font-size:10px;text-transform:uppercase;letter-spacing:.08em}.empty-row td{text-align:center;color:var(--muted);padding:26px}.history-status{display:inline-block;padding:4px 8px;border-radius:999px;font-size:10px;font-weight:800}.history-status.ok{background:rgba(56,217,150,.12);color:#7ef1bf}.history-status.no{background:rgba(255,114,123,.12);color:#ff9ca3}.result-card{margin-top:14px;padding:28px;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:18px}.result-icon{width:62px;height:62px;border-radius:18px;display:grid;place-items:center;background:rgba(93,168,255,.15);border:1px solid rgba(93,168,255,.28)}.result-icon .icon{width:32px;height:32px}.result-card h2{margin:5px 0}.result-card p{margin:0;color:var(--muted)}.hidden{display:none!important}.sidebar-overlay{display:none}
@media(max-width:1100px){.math-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.dashboard-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.activity-card:last-child{grid-column:1/-1}.mode-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.hero{grid-template-columns:1fr}.hero-visual{min-height:180px}.quick-stats{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:820px){:root{--sidebar:270px}.sidebar{transform:translateX(-105%);transition:transform .22s ease}.sidebar.open{transform:translateX(0)}.sidebar-overlay{display:block;position:fixed;inset:0;background:rgba(0,0,0,.55);z-index:45;opacity:0;pointer-events:none;transition:.2s}.sidebar-overlay.open{opacity:1;pointer-events:auto}.app-shell{margin-left:0}.mobile-menu{display:inline-flex}.top-home span{display:none}.page-content{width:min(100% - 24px,1280px);padding-top:16px}.topbar{padding:13px 14px;min-height:72px}.game-layout{grid-template-columns:1fr}.game-stats{order:-1}.game-stats .stat-list{grid-template-columns:repeat(5,minmax(100px,1fr));overflow:auto}.settings-strip{align-items:flex-start;flex-direction:column}.range-badge{align-self:flex-start}.section-heading{flex-direction:column}.table-filter{width:100%}}
@media(max-width:620px){.page-title h1{font-size:18px}.page-title p{display:none}.hero{padding:20px}.hero h2{font-size:32px}.dashboard-grid{grid-template-columns:1fr}.activity-card:last-child{grid-column:auto}.quick-stats{grid-template-columns:1fr 1fr}.math-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.tables-panel{padding:16px}.mode-grid{grid-template-columns:1fr 1fr;gap:8px}.mode-card{padding:11px}.mode-card small{display:none}.game-toolbar{padding:17px;align-items:flex-start}.game-toolbar .inline-form{margin-left:auto}.game-toolbar h2{font-size:18px}.game-toolbar p{display:none}.game-toolbar .btn{font-size:0;padding:10px}.game-toolbar .btn .icon{width:19px;height:19px}.game-arena{padding:24px 14px;min-height:380px}.question{font-size:58px;gap:9px}.answer-form{width:100%;display:grid;grid-template-columns:1fr auto}.answer-form input{width:100%;font-size:26px}.answer-button{font-size:0;padding:0;width:58px}.answer-button .icon{width:22px;height:22px}.game-stats .stat-list{grid-template-columns:repeat(5,110px)}.result-card{grid-template-columns:auto 1fr}.result-card form{grid-column:1/-1}.range-form .btn{width:100%}.range-form{width:100%}.range-form label{flex:1}.range-form select{width:100%}.top-home{display:none}}
@media print{.sidebar,.topbar,.hero,.dashboard-grid,.quick-stats,.table-filter,.table-tabs,.site-footer{display:none!important}.app-shell{margin:0}.page-content{width:100%;padding:0}.tables-panel{border:0;box-shadow:none;background:#fff;color:#000}.table-view{display:block!important;margin-bottom:20px}.math-card{break-inside:avoid;border:1px solid #ccc;background:#fff}.math-lines,.math-card h3{color:#000}}