:root{
  --bg:#fafaff;--surface:#fff;--text:#0f1020;--muted:#5d6079;--line:#e7e7f3;
  --brand:#6c47e8;--brand2:#9b6bff;--ok:#16a34a;--bad:#ef4444;
  --shadow:0 10px 40px rgba(60,40,140,.10);--grid:rgba(108,71,232,.06);
}
:root[data-theme="dark"]{
  --bg:#080b16;--surface:#101528;--text:#f2f3fb;--muted:#9a9eb9;--line:#232a45;
  --brand:#7f63ff;--brand2:#b39bff;--shadow:0 12px 44px rgba(0,0,0,.5);--grid:rgba(127,99,255,.07);
}
*{box-sizing:border-box;margin:0}
html{scroll-behavior:smooth}
body{font-family:Inter,system-ui,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;
  background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);
  background-size:48px 48px;transition:background-color .3s,color .3s}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
button{font-family:inherit}
a{color:inherit}
[hidden]{display:none!important}
/* nav */
nav{position:sticky;top:14px;z-index:30;margin:14px auto 0;max-width:1040px;display:flex;align-items:center;justify-content:space-between;
  gap:12px;padding:10px 12px 10px 20px;background:color-mix(in srgb,var(--surface) 88%,transparent);backdrop-filter:blur(14px);
  border:1px solid var(--line);border-radius:999px;box-shadow:var(--shadow)}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;text-decoration:none;color:var(--text);white-space:nowrap}
.logo i{width:30px;height:30px;border-radius:9px;background:linear-gradient(135deg,var(--brand),var(--brand2));display:grid;place-items:center;color:#fff;font-style:normal;font-size:16px;flex:none}
nav .links{display:flex;gap:22px}
nav .links a{color:var(--muted);text-decoration:none;font-size:14px;font-weight:500;padding:4px 0;border-bottom:2px solid transparent}
nav .links a:hover{color:var(--text)}
nav .links a.cur{color:var(--text);border-bottom-color:var(--brand)}
.tools{display:flex;gap:8px;align-items:center}
.chip{border:1px solid var(--line);background:var(--surface);color:var(--text);border-radius:999px;padding:7px 12px;font:600 13px Inter;cursor:pointer}
.burger{display:none}
.btn{border:0;background:var(--brand);color:#fff;border-radius:999px;padding:13px 24px;font:600 15px Inter;cursor:pointer;text-decoration:none;display:inline-flex;gap:8px;align-items:center;justify-content:center;
  box-shadow:0 8px 24px color-mix(in srgb,var(--brand) 40%,transparent);transition:transform .15s,opacity .15s}
.btn:hover{transform:translateY(-2px)}
.btn:disabled{opacity:.4;cursor:not-allowed;transform:none}
.btn.small{padding:9px 18px;font-size:14px}
.btn.ghost{background:transparent;color:var(--text);box-shadow:none;border:1px solid var(--line)}
.btn.white{background:#fff;color:#4a2fc0;box-shadow:0 8px 24px rgba(0,0,0,.2)}
/* page header */
.phead{padding:64px 0 10px}
.crumb{display:inline-block;color:var(--brand);font-weight:700;font-size:12px;letter-spacing:.12em;margin-bottom:14px}
.phead h1{font-size:clamp(34px,5vw,56px)}
.phead .lead{margin-bottom:0}
/* hero */
.hero{display:grid;grid-template-columns:1.1fr .9fr;gap:30px;align-items:center;padding:70px 0 50px}
.badge{display:inline-block;padding:7px 14px;border:1px solid var(--line);border-radius:999px;font-size:12px;font-weight:700;letter-spacing:.1em;color:var(--brand);background:var(--surface);margin-bottom:22px}
h1{font-size:clamp(40px,6vw,70px);line-height:1.04;letter-spacing:-.035em;font-weight:800}
h1 .g{background:linear-gradient(90deg,var(--brand),var(--brand2));-webkit-background-clip:text;background-clip:text;color:transparent}
.lead{margin:20px 0 28px;color:var(--muted);font-size:18px;max-width:640px}
.cta{display:flex;gap:12px;flex-wrap:wrap}
.stage{position:relative;min-height:380px;display:grid;place-items:center}
.orb{position:absolute;width:340px;height:340px;border-radius:50%;background:radial-gradient(circle at 35% 30%,var(--brand2),var(--brand) 55%,transparent 72%);opacity:.25;filter:blur(10px)}
.hcard{position:relative;width:100%;max-width:400px;background:var(--surface);border:1px solid var(--line);border-radius:26px;padding:26px;box-shadow:var(--shadow)}
.hcard small{display:block;font-size:11px;letter-spacing:.12em;font-weight:700;color:var(--muted)}
.hcard h3{font-size:20px;margin:4px 0 16px}
.hbig{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:14px}
.hbig b{font-size:60px;line-height:1;letter-spacing:-.04em;background:linear-gradient(135deg,var(--brand),var(--brand2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hbig span{color:var(--muted);font-size:15px;margin-left:4px}
.pill{display:inline-block;padding:6px 14px;border-radius:999px;font-weight:700;font-size:13px;color:var(--brand);border:1px solid color-mix(in srgb,var(--brand) 40%,transparent);background:color-mix(in srgb,var(--brand) 12%,transparent)}
.hrow{display:flex;justify-content:space-between;font-size:14px;padding:8px 0;border-top:1px solid var(--line);color:var(--muted)}
.hrow b{color:var(--text)}
.empty{color:var(--muted);font-size:14px;padding:8px 0}
.float{position:absolute;background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:10px 14px;box-shadow:var(--shadow);animation:bob 6s ease-in-out infinite;font-size:13px;font-weight:600}
.float.a{top:6px;right:0}.float.b{bottom:16px;left:0;animation-delay:-3s}
@keyframes bob{50%{transform:translateY(-9px)}}
/* sections */
section{padding:44px 0}
h2{font-size:clamp(26px,3.6vw,38px);letter-spacing:-.03em;font-weight:800;margin-bottom:10px}
h3{letter-spacing:-.01em}
.sub{color:var(--muted);margin-bottom:28px;max-width:680px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:26px;padding:28px;box-shadow:var(--shadow)}
.card p{color:var(--muted);font-size:15px;margin-top:6px}
.cards3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.cards2{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.cards4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.ico{width:44px;height:44px;border-radius:14px;background:color-mix(in srgb,var(--brand) 14%,transparent);display:grid;place-items:center;font-size:22px;margin-bottom:14px}
.num{width:36px;height:36px;border-radius:12px;background:var(--brand);color:#fff;display:grid;place-items:center;font-weight:700;margin-bottom:14px}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;padding:30px 0 10px}
.stat{background:var(--surface);border:1px solid var(--line);border-radius:20px;padding:20px;text-align:center}
.stat b{display:block;font-size:34px;letter-spacing:-.03em;background:linear-gradient(135deg,var(--brand),var(--brand2));-webkit-background-clip:text;background-clip:text;color:transparent}
.stat span{color:var(--muted);font-size:13px}
.band{background:linear-gradient(135deg,var(--brand),#5a3ad6);color:#fff;border-radius:30px;padding:48px 28px;text-align:center;margin:30px 0}
.band h2{color:#fff}
.band p{color:rgba(255,255,255,.85);max-width:560px;margin:0 auto 24px}
/* tables, faq */
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:22px;background:var(--surface);box-shadow:var(--shadow)}
table{width:100%;border-collapse:collapse;min-width:620px}
th,td{padding:16px 20px;text-align:left;font-size:14px;vertical-align:top;border-top:1px solid var(--line)}
th{border-top:0;color:var(--muted);font-size:12px;letter-spacing:.08em;text-transform:uppercase}
td:first-child{font-weight:700;white-space:nowrap}
td{color:var(--muted)}
td:first-child{color:var(--text)}
.faq{background:var(--surface);border:1px solid var(--line);border-radius:22px;padding:6px 24px;box-shadow:var(--shadow)}
.faq details{padding:16px 0;border-top:1px solid var(--line)}
.faq details:first-child{border-top:0}
.faq summary{cursor:pointer;font-weight:600;list-style:none;display:flex;justify-content:space-between;gap:12px}
.faq summary::after{content:"+";color:var(--brand);font-size:20px;line-height:1}
.faq details[open] summary::after{content:"−"}
.faq details p{color:var(--muted);font-size:15px;margin-top:10px}
.points{list-style:none;padding:0;display:grid;gap:10px;margin-top:10px}
.points li{position:relative;padding-left:24px;color:var(--muted);font-size:15px}
.points li::before{content:"";position:absolute;left:3px;top:9px;width:8px;height:8px;border-radius:50%;background:var(--brand)}
.lvl{border-left:5px solid var(--brand)}
.lvl b{font-size:13px;color:var(--brand);letter-spacing:.06em}
.days{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:14px}
.day{background:var(--surface);border:1px solid var(--line);border-radius:20px;padding:18px}
.day small{color:var(--brand);font-weight:700;font-size:12px;letter-spacing:.08em}
.day p{font-size:14px;color:var(--muted);margin-top:6px}
.stack{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.tag{padding:6px 12px;border-radius:999px;border:1px solid var(--line);background:var(--bg);font-size:13px;font-weight:600}
.notice{padding:16px 20px;border-radius:18px;background:color-mix(in srgb,var(--brand) 10%,transparent);font-size:14px;color:var(--muted)}
/* predict form */
.stepper{display:flex;gap:10px;margin-bottom:26px}
.sp{flex:1}
.sp i{display:block;height:6px;border-radius:99px;background:var(--line);margin-bottom:8px;overflow:hidden;position:relative}
.sp i::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,var(--brand),var(--brand2));transform:scaleX(0);transform-origin:left;transition:transform .4s}
.sp.on i::after,.sp.done i::after{transform:scaleX(1)}
.sp span{font-size:12px;font-weight:600;color:var(--muted)}
.sp.on span{color:var(--text)}
.st-t{font-size:24px;letter-spacing:-.02em}
.st-d{color:var(--muted);margin:4px 0 22px;font-size:15px}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:22px 30px}
.field .row{display:flex;justify-content:space-between;gap:10px;font-weight:600;font-size:14px;margin-bottom:9px}
.field .row output{color:var(--brand);white-space:nowrap}
.field .hint{font-size:12px;color:var(--muted);margin-top:7px}
input[type=range]{-webkit-appearance:none;appearance:none;width:100%;height:8px;border-radius:99px;outline:0;
  background:linear-gradient(90deg,var(--brand) var(--p,50%),var(--line) var(--p,50%))}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:22px;height:22px;border-radius:50%;background:#fff;border:4px solid var(--brand);cursor:pointer;box-shadow:0 2px 8px rgba(0,0,0,.25)}
input[type=range]::-moz-range-thumb{width:14px;height:14px;border-radius:50%;background:#fff;border:4px solid var(--brand);cursor:pointer}
.seg{display:flex;gap:6px;background:var(--bg);border:1px solid var(--line);border-radius:14px;padding:4px}
.seg button{flex:1;border:0;background:transparent;color:var(--muted);font:600 13px Inter;padding:9px 6px;border-radius:10px;cursor:pointer;transition:all .15s}
.seg button.on{background:var(--brand);color:#fff;box-shadow:0 4px 14px color-mix(in srgb,var(--brand) 40%,transparent)}
.att{margin-top:20px;padding:12px 16px;border-radius:14px;background:color-mix(in srgb,var(--brand) 10%,transparent);font-size:14px}
.att b{color:var(--brand)}
.navb{display:flex;justify-content:space-between;margin-top:28px;gap:12px}
.res{display:grid;grid-template-columns:.8fr 1.2fr;gap:28px}
.ringbox{text-align:center}
.ring{position:relative;width:230px;height:230px;margin:0 auto 14px}
.ring svg{transform:rotate(-90deg)}
.ring circle{fill:none;stroke-width:16;stroke-linecap:round}
.ring .bg{stroke:var(--line)}
.ring .fg{stroke:url(#g);transition:stroke-dashoffset 1.1s cubic-bezier(.2,.8,.2,1)}
.ring .mid{position:absolute;inset:0;display:grid;place-content:center}
.ring .mid b{font-size:58px;letter-spacing:-.03em;line-height:1}
.ring .mid span{color:var(--muted);font-size:13px}
.box{background:var(--bg);border:1px solid var(--line);border-radius:18px;padding:18px 20px;margin-bottom:14px}
.box h4{font-size:14px;margin-bottom:10px}
.box ul{list-style:none;padding:0;display:grid;gap:8px}
.box li{font-size:14px;padding-left:22px;position:relative;color:var(--muted)}
.box li::before{content:"";position:absolute;left:2px;top:7px;width:8px;height:8px;border-radius:50%;background:var(--brand)}
.box.ins li::before{background:var(--ok)}
.sc{display:flex;justify-content:space-between;align-items:center;gap:10px;font-size:14px;padding:9px 0;border-top:1px solid var(--line)}
.sc:first-of-type{border-top:0}
.sc b{white-space:nowrap}
.pos{color:var(--ok)}.neg{color:var(--bad)}.zero{color:var(--muted)}
.note{margin-top:16px;font-size:12.5px;color:var(--muted)}
.loader{position:fixed;inset:0;z-index:50;background:color-mix(in srgb,var(--bg) 82%,transparent);backdrop-filter:blur(8px);display:grid;place-content:center;text-align:center;gap:16px;padding:20px}
.spin{width:52px;height:52px;border-radius:50%;border:5px solid var(--line);border-top-color:var(--brand);margin:0 auto;animation:sp .9s linear infinite}
@keyframes sp{to{transform:rotate(360deg)}}
.err{padding:14px 16px;border-radius:14px;background:color-mix(in srgb,var(--bad) 12%,transparent);color:var(--bad);font-size:14px;margin-top:16px}
/* footer */
footer{margin-top:50px;border-top:1px solid var(--line);padding:44px 0 30px;color:var(--muted);font-size:14px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:30px}
footer h5{color:var(--text);font-size:13px;margin-bottom:10px;letter-spacing:.06em}
footer a{display:block;text-decoration:none;color:var(--muted);padding:3px 0}
footer a:hover{color:var(--text)}
footer .copy{margin-top:30px;padding-top:20px;border-top:1px solid var(--line);font-size:13px}
@media(max-width:860px){
  .burger{display:inline-block}.logo span{display:none}
  nav .links{display:none}
  nav .links.open{display:flex;flex-direction:column;gap:4px;position:absolute;top:calc(100% + 10px);left:0;right:0;background:var(--surface);border:1px solid var(--line);border-radius:22px;padding:14px 20px;box-shadow:var(--shadow)}
  nav .links.open a{padding:10px 0;font-size:16px}
  .hero,.res,.grid,.cards3,.cards2,.foot-grid{grid-template-columns:1fr}
  .cards4,.stats{grid-template-columns:repeat(2,1fr)}
  .hero{padding-top:44px}.phead{padding-top:44px}
}

/* 3D graduation cap (home) */
.stage{min-height:480px}
#cap3d{position:absolute;top:-8px;left:50%;transform:translateX(-50%);width:300px;height:250px;z-index:3;pointer-events:none}
#cap3d canvas{width:100%!important;height:100%!important;display:block}
.stage .hcard{margin-top:150px}
.stage .float.a{top:40px}
@media(max-width:860px){.stage{min-height:440px}#cap3d{width:260px;height:220px}.stage .hcard{margin-top:120px}}

/* language select */
select.chip{padding:7px 8px;cursor:pointer;background:var(--surface);color:var(--text)}
select.chip option{background:var(--surface);color:var(--text)}

/* logo image */
.logo img{width:30px;height:30px;border-radius:9px;flex:none;display:block}

/* mascot */
.mascot{display:block;width:100%;height:auto;animation:bob 3.2s ease-in-out infinite}
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(-6px)}}
@media(prefers-reduced-motion:reduce){.mascot{animation:none}}
.meet{display:flex;gap:32px;align-items:center;flex-wrap:wrap}
.meet-m{width:190px;flex:none;margin:0 auto}
.mres{width:104px;margin:0 auto 8px}
/* quiz */
.qprog{height:6px;background:var(--line);border-radius:99px;overflow:hidden;margin-bottom:18px}
.qprog i{display:block;height:100%;background:linear-gradient(90deg,var(--brand),var(--brand2));transition:width .3s}
.qopt{display:block;width:100%;text-align:left;padding:14px 16px;margin-bottom:10px;border:1px solid var(--line);border-radius:14px;background:var(--surface);color:var(--text);font-size:15px;line-height:1.45;cursor:pointer;transition:border-color .2s,background .2s}
.qopt:hover:not(:disabled){border-color:var(--brand)}
.qopt:disabled{cursor:default}
.qopt.ok{border-color:var(--ok);background:color-mix(in srgb,var(--ok) 14%,transparent)}
.qopt.bad{border-color:var(--bad);background:color-mix(in srgb,var(--bad) 12%,transparent)}
.qexp{margin:6px 0 16px;padding:14px 16px;border-radius:14px;background:color-mix(in srgb,var(--brand) 10%,transparent);font-size:15px}
.qres{text-align:center}
.qres .mres{width:150px}
.qres .big{font-size:44px;font-weight:800;margin:8px 0}
/* history */
.hsvg{width:100%;height:auto;display:block}
.hrow{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:9px 0;border-top:1px solid var(--line);font-size:14px;color:var(--muted)}
.hrow b{color:var(--text);font-size:16px}
.cmpsel{display:flex;gap:14px;flex-wrap:wrap;margin:10px 0 14px}
.cmpsel label{display:flex;flex-direction:column;gap:4px;font-size:13px;color:var(--muted)}
.hsel{padding:9px 10px;border-radius:10px;border:1px solid var(--line);background:var(--surface);color:var(--text);font-family:inherit;font-size:14px}
table.cmp{width:100%;border-collapse:collapse;font-size:14px}
table.cmp th,table.cmp td{padding:9px 6px;border-top:1px solid var(--line);text-align:left}
table.cmp th{border-top:0;color:var(--muted);font-weight:600}

/* nav fit with 6 links */
nav .links{gap:16px}
nav .links a{white-space:nowrap}
@media(max-width:1180px){nav .tools .btn.small{display:none}}
.mascot{overflow:visible}