/* PeekBench — same design language as peeksolve.com ("Sky"): Satoshi + EB Garamond
   + Geist Mono, blue #2563eb, sky hero, aperture mark. */
:root{
  --white:#ffffff;
  --ink:#0b1220;
  --ink-2:#414d63;
  --gray:#68758d;
  --gray-2:#9aa6ba;
  --haze:#f2f5fb;
  --haze-2:#e6ecf7;
  --line:rgba(15,26,50,.1);
  --line-2:rgba(15,26,50,.06);
  --blue:#2563eb;
  --blue-2:#1d4ed8;
  --blue-soft:rgba(37,99,235,.08);
  --ok:#1f9d61;
  --ok-soft:rgba(31,157,97,.1);
  --bad:#e0475b;
  --bad-soft:rgba(224,71,91,.1);
  --amber:#e8a33d;
  --r:14px;
  --r-lg:26px;
  --maxw:1200px;
  --ease:cubic-bezier(.16,1,.3,1);
  --sans:"Satoshi","Geist",Inter,system-ui,-apple-system,sans-serif;
  --serif:"EB Garamond",Georgia,"Times New Roman",serif;
  --mono:"Geist Mono",ui-monospace,SFMono-Regular,monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{background:var(--white);color:var(--ink);font-family:var(--sans);font-size:17px;line-height:1.6;
  -webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit}
::selection{background:var(--blue);color:#fff}
[hidden]{display:none!important}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 32px}
@media(max-width:560px){.wrap{padding:0 18px}}
.mono{font-family:var(--mono)}
/* grid children may shrink below their content (tables scroll inside instead) */
.hero-grid>*,.charts>*,.tracks>*,.method>*,.pick>*,.live>*,.res-hero>*,.res-kpis>*{min-width:0}
.num{font-variant-numeric:tabular-nums}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;font-family:var(--sans);font-weight:600;font-size:15.5px;
  padding:13px 24px;border-radius:12px;cursor:pointer;border:1px solid transparent;
  transition:transform .25s var(--ease),box-shadow .25s var(--ease),background .2s,opacity .2s;white-space:nowrap}
.btn:disabled{opacity:.55;cursor:default;transform:none!important}
.btn-blue{background:var(--blue);color:#fff;box-shadow:0 1px 2px rgba(29,78,216,.2),0 12px 28px -16px rgba(37,99,235,.55)}
.btn-blue:hover{background:var(--blue-2);transform:translateY(-1px);box-shadow:0 2px 4px rgba(29,78,216,.22),0 16px 34px -16px rgba(37,99,235,.6)}
.btn-glass{background:rgba(11,18,32,.26);color:#fff;border-color:rgba(255,255,255,.38);backdrop-filter:blur(12px)}
.btn-glass:hover{background:rgba(11,18,32,.4)}
.btn-ghost{background:var(--white);color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--gray-2);background:var(--haze)}
.btn-lg{font-size:17px;padding:16px 30px;border-radius:14px}
.btn-sm{font-size:13.5px;padding:8px 14px;border-radius:10px}

/* ---------- nav ---------- */
nav{position:fixed;top:0;left:0;right:0;z-index:80;transition:background .35s,box-shadow .35s,border-color .35s;border-bottom:1px solid transparent}
nav .nav-in{max-width:var(--maxw);margin:0 auto;padding:0 32px;height:64px;display:flex;align-items:center;justify-content:space-between}
@media(max-width:560px){nav .nav-in{padding:0 18px}}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:20px;letter-spacing:-0.02em;color:#fff;transition:color .35s}
.brand svg .ring{stroke:#fff;transition:stroke .35s}
.brand svg .bar{fill:#fff;transition:fill .35s}
.brand b{font-weight:700;opacity:.62;font-family:var(--mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;
  border:1px solid currentColor;border-radius:6px;padding:2px 6px;margin-left:2px}
.nav-links{display:flex;gap:28px;font-size:14.5px;font-weight:500;color:rgba(255,255,255,.92);transition:color .35s}
.nav-links a{opacity:.92;transition:opacity .2s}
.nav-links a:hover{opacity:1}
.nav-cta{display:flex;align-items:center;gap:14px}
.signin{font-size:14.5px;font-weight:500;color:rgba(255,255,255,.92);transition:color .35s;cursor:pointer;background:none;border:none}
.nav-run{font-size:14px;padding:9px 17px}
nav.scrolled,nav.solid{background:rgba(255,255,255,.82);backdrop-filter:blur(16px) saturate(1.5);border-color:var(--line-2)}
nav.scrolled .brand,nav.solid .brand,nav.scrolled .signin,nav.solid .signin{color:var(--ink)}
nav.scrolled .brand svg .ring,nav.solid .brand svg .ring{stroke:var(--ink)}
nav.scrolled .brand svg .bar,nav.solid .brand svg .bar{fill:var(--blue)}
nav.scrolled .nav-links,nav.solid .nav-links{color:var(--ink-2)}
@media(max-width:880px){.nav-links{display:none}}
@media(max-width:480px){.signin{display:none}}

/* ---------- hero / sky ---------- */
.hero{position:relative;padding:128px 0 40px;color:#fff;overflow:hidden}
.sky{position:absolute;inset:0;z-index:0;background:#2f5ea8 url('/assets/hero-peak-4k.jpg') 82% 50%/cover no-repeat}
@media(max-width:760px){.sky{background-image:url('/assets/hero-peak-4k-sm.jpg');background-position:82% 46%}}
.sky::after{content:"";position:absolute;left:0;right:0;bottom:0;height:58%;
  background:linear-gradient(180deg,transparent 0%,rgba(255,255,255,.06) 28%,rgba(255,255,255,.5) 62%,rgba(255,255,255,.9) 86%,#ffffff 100%)}
.shimmer{position:absolute;inset:0;pointer-events:none;opacity:.26;
  background:linear-gradient(115deg,transparent 30%,rgba(255,255,255,.16) 46%,rgba(255,255,255,.3) 50%,rgba(255,255,255,.16) 54%,transparent 70%);
  background-size:240% 100%;animation:sweep 12s var(--ease) infinite}
@keyframes sweep{0%{background-position:120% 0}55%,100%{background-position:-120% 0}}
.hero .wrap{position:relative;z-index:3}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
@media(max-width:980px){.hero-grid{grid-template-columns:1fr;gap:36px}}
.kicker{display:inline-flex;align-items:center;gap:9px;font-family:var(--mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;
  padding:7px 13px;border-radius:100px;background:rgba(11,18,32,.32);border:1px solid rgba(255,255,255,.28);backdrop-filter:blur(10px)}
.kicker .live{width:7px;height:7px;border-radius:50%;background:#4ade80;box-shadow:0 0 0 4px rgba(74,222,128,.22);animation:livePulse 2s ease-in-out infinite}
@keyframes livePulse{50%{box-shadow:0 0 0 7px rgba(74,222,128,.06)}}
.hero h1{font-family:var(--serif);font-weight:500;font-size:clamp(46px,6.4vw,86px);line-height:1.0;letter-spacing:-0.01em;margin-top:22px;
  text-shadow:0 2px 30px rgba(21,58,120,.25)}
.hero h1 em{font-style:italic}
.hero .sub{max-width:540px;margin-top:22px;font-size:19px;line-height:1.55;color:rgba(255,255,255,.96);font-weight:500;
  text-shadow:0 1px 3px rgba(6,13,28,.35),0 2px 24px rgba(6,13,28,.45)}
.hero-cta{display:flex;align-items:center;gap:13px;margin-top:30px;flex-wrap:wrap}
.pills{display:flex;gap:10px;margin-top:24px;flex-wrap:wrap}
.pill{display:inline-flex;align-items:baseline;gap:8px;padding:8px 15px;border-radius:100px;background:rgba(11,18,32,.38);
  border:1px solid rgba(255,255,255,.28);backdrop-filter:blur(12px)}
.pill .l{font-family:var(--mono);font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;color:rgba(255,255,255,.85)}
.pill .v{font-weight:700;font-size:15px;color:#fff}
.up{opacity:0;transform:translateY(22px);animation:rise 1s var(--ease) forwards}
@keyframes rise{to{opacity:1;transform:none}}

/* podium card in the hero */
.podium{background:linear-gradient(180deg,rgba(22,29,46,.86),rgba(10,15,27,.92));border:1px solid rgba(255,255,255,.12);border-radius:22px;
  backdrop-filter:blur(18px) saturate(1.2);box-shadow:0 40px 90px -30px rgba(6,14,36,.75),0 0 60px -20px rgba(91,140,255,.45),inset 0 1px 0 rgba(255,255,255,.08);
  padding:22px 22px 18px;color:#eef2fb}
.podium-h{display:flex;align-items:center;justify-content:space-between;font-family:var(--mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:#93a0b6;margin-bottom:14px}
.podium-row{display:grid;grid-template-columns:28px 1fr auto;gap:12px;align-items:center;padding:11px 4px;border-top:1px solid rgba(255,255,255,.07)}
.podium-row:first-of-type{border-top:none}
.podium-row .rk{font-family:var(--mono);font-size:13px;color:#93a0b6}
.podium-row .nm{font-weight:600;font-size:15px;line-height:1.25}
.podium-row .nm small{display:block;font-weight:500;font-size:11.5px;color:#93a0b6;font-family:var(--mono);margin-top:2px}
.podium-row .sc{font-family:var(--mono);font-size:22px;font-weight:500;color:#fff;font-variant-numeric:tabular-nums}
.podium-row .track{grid-column:2 / 4;height:5px;border-radius:5px;background:rgba(255,255,255,.08);overflow:hidden;margin-top:-2px}
.podium-row .track i{display:block;height:100%;width:0;border-radius:5px;background:linear-gradient(90deg,#5b8cff,#8db4ff);transition:width 1.4s var(--ease)}
.podium-row.gold .track i{background:linear-gradient(90deg,#38db7c,#8ef0b6)}
.podium-foot{display:flex;justify-content:space-between;margin-top:12px;font-family:var(--mono);font-size:11px;color:#7f8ca3}
.podium-foot a{color:#a9c1ff}

/* ---------- sections ---------- */
section{padding:100px 0;position:relative}
@media(max-width:560px){section{padding:70px 0}}
.eyebrow{display:inline-flex;align-items:center;gap:9px;font-family:var(--mono);font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--blue);margin-bottom:16px}
h2.sec{font-weight:600;font-size:clamp(34px,4.6vw,56px);letter-spacing:-0.03em;line-height:1.06}
h2.sec .fade{color:#7b89a1}
h2.sec .serif{font-family:var(--serif);font-weight:500;font-style:italic;letter-spacing:-0.01em}
.sec-sub{margin-top:14px;font-size:18px;color:var(--gray);max-width:600px}
.center{text-align:center}
.center .sec-sub{margin-left:auto;margin-right:auto}
.sec-top{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;flex-wrap:wrap}
.rev{opacity:0;transform:translateY(26px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
.rev.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){.rev{opacity:1;transform:none}.up{opacity:1;transform:none;animation:none}.shimmer{animation:none}html{scroll-behavior:auto}}
.panel{background:linear-gradient(180deg,#fbfcfe,#f4f7fc);border:1px solid var(--line-2);border-radius:22px;box-shadow:0 20px 50px -34px rgba(15,26,50,.25)}
.tint{background:linear-gradient(180deg,#ffffff 0%,#f2f6fc 22%,#eaf0fa 100%)}

/* chips & tags */
.chip{display:inline-flex;align-items:center;gap:6px;font-family:var(--mono);font-size:10.5px;letter-spacing:.06em;text-transform:uppercase;
  border:1px solid var(--line);color:var(--gray);border-radius:100px;padding:3px 9px;white-space:nowrap}
.chip.std{color:#fff;background:var(--blue);border-color:var(--blue)}
.chip.ps{color:var(--blue);border-color:rgba(37,99,235,.3);background:var(--blue-soft)}
.chip.ok{color:var(--ok);border-color:rgba(31,157,97,.3);background:var(--ok-soft)}
.dot{display:inline-block;width:8px;height:8px;border-radius:50%}

/* ---------- leaderboard ---------- */
.board{margin-top:40px;overflow:hidden}
.board-scroll{overflow-x:auto}
table.lb{width:100%;border-collapse:collapse;min-width:860px}
.lb th{font-family:var(--mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--gray);font-weight:500;text-align:left;
  padding:16px 12px;border-bottom:1px solid var(--line);white-space:nowrap;cursor:pointer;user-select:none}
.lb th.sorted{color:var(--blue)}
.lb th .ar{opacity:.6;margin-left:4px}
.lb td{padding:15px 12px;border-bottom:1px solid var(--line-2);vertical-align:middle;font-size:15px}
.lb tr:last-child td{border-bottom:none}
.lb tbody tr{transition:background .2s}
.lb tbody tr:hover{background:rgba(37,99,235,.035)}
.lb tr.mine{background:rgba(31,157,97,.07)}
.lb .rank{font-family:var(--mono);color:var(--gray);width:44px}
.lb .rank.top{color:var(--ink);font-weight:600}
.av{display:inline-flex;align-items:center;justify-content:center;flex:none;color:#fff;font-weight:700}
.mdl{display:flex;align-items:center;gap:12px;min-width:220px}
.mdl .av{width:34px;height:34px;border-radius:10px;flex:none;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:13px;color:#fff}
.mdl .nm{font-weight:600;line-height:1.25}
.mdl .nm small{display:block;font-weight:500;font-size:12px;color:var(--gray);font-family:var(--mono)}
.scorecell{display:flex;align-items:center;gap:12px;min-width:140px}
.scorecell .v{font-family:var(--mono);font-size:19px;font-weight:500;width:34px;font-variant-numeric:tabular-nums}
div.bar{flex:1;height:8px;border-radius:8px;background:var(--haze-2);overflow:hidden;min-width:60px}
.bar i{display:block;height:100%;width:0;border-radius:8px;background:linear-gradient(90deg,#5b8cff,var(--blue));transition:width 1.2s var(--ease)}
.bar.green i{background:linear-gradient(90deg,#4ade80,var(--ok))}
.metric{font-family:var(--mono);font-size:14.5px;font-variant-numeric:tabular-nums;white-space:nowrap}
.metric small{color:var(--gray);font-size:11.5px}
.metric.best{color:var(--ok);font-weight:600}
.lb-empty{padding:60px 20px;text-align:center;color:var(--gray)}

/* ---------- speed race ---------- */
.race{margin-top:40px;padding:26px 26px 18px}
.race-head{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;margin-bottom:16px}
.race-head .t{font-family:var(--mono);font-size:12px;color:var(--gray)}
.lane{display:grid;grid-template-columns:190px 1fr 74px;gap:14px;align-items:center;padding:8px 0}
@media(max-width:640px){.lane{grid-template-columns:110px 1fr 60px;gap:10px}}
.lane .ln{font-weight:600;font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.lane .tr{position:relative;height:30px;border-radius:9px;background:repeating-linear-gradient(90deg,transparent 0 calc(10% - 1px),rgba(15,26,50,.06) calc(10% - 1px) 10%),var(--haze);overflow:hidden}
.lane .tr .fill{position:absolute;left:0;top:0;bottom:0;width:0;border-radius:9px;background:linear-gradient(90deg,rgba(91,140,255,.15),rgba(37,99,235,.28))}
.lane .tr .car{position:absolute;top:50%;left:0;width:22px;height:22px;margin-top:-11px;margin-left:-11px;border-radius:50%;background:var(--blue);
  box-shadow:0 0 0 4px rgba(37,99,235,.18),0 4px 12px rgba(37,99,235,.45)}
.lane.won .tr .car{background:var(--ok);box-shadow:0 0 0 4px rgba(31,157,97,.2),0 4px 12px rgba(31,157,97,.45)}
.lane .tm{font-family:var(--mono);font-size:14px;text-align:right;font-variant-numeric:tabular-nums;color:var(--gray)}
.lane.done .tm{color:var(--ink)}
.lane.won .tm{color:var(--ok);font-weight:600}

/* ---------- scatter ---------- */
.charts{display:grid;grid-template-columns:1.1fr .9fr;gap:22px;margin-top:40px}
@media(max-width:980px){.charts{grid-template-columns:1fr}}
.chart{padding:24px 24px 18px}
.chart h3{font-size:18px;font-weight:600;letter-spacing:-0.01em}
.chart p.cap{font-size:14px;color:var(--gray);margin-top:4px}
.scatter{width:100%;height:auto;display:block;margin-top:12px;overflow:visible}
.scatter .ax{stroke:rgba(15,26,50,.12)}
.scatter .axl{font-family:var(--mono);font-size:10px;fill:var(--gray)}
.scatter .zone{fill:rgba(31,157,97,.07)}
.scatter .zonel{font-family:var(--mono);font-size:10px;fill:var(--ok);letter-spacing:.06em}
.scatter .pt{transition:r .2s}
.scatter .ptl{font-size:11.5px;font-weight:600;fill:var(--ink)}

/* ---------- heatmap ---------- */
.heat{width:100%;border-collapse:separate;border-spacing:4px;margin-top:12px}
.heat th{font-family:var(--mono);font-size:10px;letter-spacing:.06em;text-transform:uppercase;color:var(--gray);font-weight:500;padding:4px;text-align:center}
.heat th.row{text-align:left;text-transform:none;letter-spacing:0;font-family:var(--sans);font-size:13px;font-weight:600;color:var(--ink);white-space:nowrap;padding-right:8px}
.heat td{height:34px;border-radius:8px;text-align:center;font-family:var(--mono);font-size:11.5px;font-variant-numeric:tabular-nums;color:var(--ink);min-width:44px}

/* ---------- suite gallery ---------- */
.tracks{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-top:44px}
@media(max-width:880px){.tracks{grid-template-columns:1fr}}
.trk{padding:28px}
.trk .kb{display:flex;gap:6px;margin-bottom:14px}
.keycap{min-width:32px;height:34px;padding:0 9px;display:inline-flex;align-items:center;justify-content:center;background:linear-gradient(180deg,#fff,#eef2f9);
  border:1px solid var(--line);border-radius:9px;box-shadow:0 2.5px 0 rgba(15,26,50,.12),inset 0 1px 0 #fff;font-family:var(--mono);font-size:13.5px;color:var(--ink-2)}
.trk h3{font-size:21px;font-weight:600;letter-spacing:-0.01em}
.trk p{font-size:15px;color:var(--gray);margin-top:6px}
.thumbs{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:18px}
.thumbs img{width:100%;aspect-ratio:16/10;object-fit:cover;object-position:top;border-radius:9px;border:1px solid var(--line-2);background:#fff;
  box-shadow:0 6px 16px -10px rgba(15,26,50,.3);transition:transform .3s var(--ease)}
.thumbs img:hover{transform:scale(1.04)}
.cats{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-top:30px}
.cat{display:inline-flex;align-items:center;gap:9px;padding:9px 15px;border-radius:12px;background:#fff;border:1px solid var(--line);font-size:14.5px;font-weight:500}
.cat b{font-family:var(--mono);font-weight:500;font-size:12px;color:var(--gray)}

/* ---------- CTA band ---------- */
.cta-band{border-radius:30px;padding:64px 48px;position:relative;overflow:hidden;color:#fff;
  background:radial-gradient(120% 140% at 85% 0%,#6ea3f5 0%,#3e79ec 38%,#1f4fd1 70%,#173a9e 100%);box-shadow:0 40px 90px -40px rgba(31,79,209,.6)}
.cta-band h2{font-family:var(--serif);font-weight:500;font-size:clamp(36px,4.6vw,58px);line-height:1.04}
.cta-band p{margin-top:14px;font-size:18px;color:rgba(255,255,255,.9);max-width:560px}
.cta-band .btn-white{background:#fff;color:var(--blue-2);margin-top:28px}
.cta-band .btn-white:hover{transform:translateY(-1px)}
.cta-band .bg-rings{position:absolute;right:-80px;top:-80px;width:420px;height:420px;opacity:.16}

/* ---------- method + faq ---------- */
.method{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:40px}
@media(max-width:880px){.method{grid-template-columns:1fr}}
.mcard{padding:24px}
.mcard .n{font-family:var(--mono);font-size:11px;color:var(--blue);margin-bottom:8px}
.mcard h4{font-size:17px;font-weight:600}
.mcard p{font-size:14.5px;color:var(--gray);margin-top:6px}
.formula{margin-top:22px;padding:18px 22px;border-radius:14px;background:var(--ink);color:#dfe7f5;font-family:var(--mono);font-size:13.5px;line-height:1.7;overflow-x:auto}
.formula b{color:#8db4ff;font-weight:500}
.faq{max-width:780px;margin:40px auto 0}
.faq details{border-bottom:1px solid var(--line);padding:18px 0}
.faq summary{cursor:pointer;font-weight:600;font-size:17px;list-style:none;display:flex;justify-content:space-between;gap:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-family:var(--mono);color:var(--gray);transition:transform .3s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details p{margin-top:10px;color:var(--gray);font-size:15.5px}

/* ---------- run page ---------- */
.page-head{padding:116px 0 24px;background:linear-gradient(180deg,#eaf1fd,#ffffff)}
.page-head h1{font-family:var(--serif);font-weight:500;font-size:clamp(40px,5vw,64px);line-height:1.02}
.page-head p{margin-top:12px;color:var(--gray);font-size:18px;max-width:620px}
.gate{max-width:640px;margin:20px auto 0;padding:34px;text-align:center}
.gate h3{font-size:22px;font-weight:600}
.gate p{color:var(--gray);margin-top:8px}
.gate .btn{margin-top:20px}
.pick{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:26px}
@media(max-width:880px){.pick{grid-template-columns:1fr}}
.mcard-pick{position:relative;text-align:left;padding:22px;border-radius:20px;border:1.5px solid var(--line);background:#fff;cursor:pointer;
  transition:border-color .2s,box-shadow .3s var(--ease),transform .3s var(--ease)}
.mcard-pick:hover{transform:translateY(-2px);box-shadow:0 20px 40px -26px rgba(15,26,50,.3)}
.mcard-pick.on{border-color:var(--blue);box-shadow:0 0 0 4px rgba(37,99,235,.12),0 20px 40px -26px rgba(37,99,235,.4)}
.mcard-pick .top{display:flex;justify-content:space-between;align-items:center;gap:10px}
.mcard-pick h4{font-size:19px;font-weight:600;margin-top:12px}
.mcard-pick .facts{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:14px}
.mcard-pick .fact{background:var(--haze);border-radius:10px;padding:8px 10px}
.mcard-pick .fact b{display:block;font-family:var(--mono);font-weight:500;font-size:15px}
.mcard-pick .fact span{font-size:11px;color:var(--gray)}
.mcard-pick .tick{width:22px;height:22px;border-radius:50%;border:1.5px solid var(--gray-2);display:flex;align-items:center;justify-content:center;transition:all .2s}
.mcard-pick.on .tick{background:var(--blue);border-color:var(--blue)}
.mcard-pick.on .tick::after{content:"";width:7px;height:7px;border-radius:50%;background:#fff}
.run-bar{display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap;margin-top:22px;padding:18px 22px}
.switch{display:flex;align-items:center;gap:12px;cursor:pointer}
.switch input{display:none}
.switch .sl{width:44px;height:26px;border-radius:26px;background:var(--gray-2);position:relative;transition:background .2s;flex:none}
.switch .sl::after{content:"";position:absolute;left:3px;top:3px;width:20px;height:20px;border-radius:50%;background:#fff;box-shadow:0 1px 3px rgba(0,0,0,.25);transition:transform .25s var(--ease)}
.switch input:checked + .sl{background:var(--blue)}
.switch input:checked + .sl::after{transform:translateX(18px)}
.switch .tx b{display:block;font-weight:600;font-size:15px}
.switch .tx span{font-size:13px;color:var(--gray)}
.est{font-family:var(--mono);font-size:13px;color:var(--gray);text-align:right}
.est b{color:var(--ink);font-weight:500}

/* live view */
.live{display:grid;grid-template-columns:330px 1fr;gap:22px;margin-top:26px}
@media(max-width:980px){.live{grid-template-columns:1fr}}
.dash{padding:24px;position:sticky;top:84px;align-self:start}
@media(max-width:980px){.dash{position:static}}
.ring{position:relative;width:200px;height:200px;margin:0 auto}
.ring svg{width:100%;height:100%;transform:rotate(-90deg)}
.ring .bg{stroke:var(--haze-2)}
.ring .fg{stroke:url(#ringGrad);transition:stroke-dashoffset .5s var(--ease)}
.ring .in{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center}
.ring .big{font-family:var(--mono);font-size:44px;font-weight:500;line-height:1;font-variant-numeric:tabular-nums}
.ring .lbl{font-family:var(--mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--gray);margin-top:6px}
.stats{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:20px}
.stat{background:#fff;border:1px solid var(--line-2);border-radius:12px;padding:10px 12px}
.stat b{display:block;font-family:var(--mono);font-size:19px;font-weight:500;font-variant-numeric:tabular-nums}
.stat span{font-size:11.5px;color:var(--gray)}
.prog{height:6px;border-radius:6px;background:var(--haze-2);overflow:hidden;margin-top:18px}
.prog i{display:block;height:100%;width:0;background:linear-gradient(90deg,#5b8cff,var(--blue));transition:width .4s var(--ease)}
.phase{margin-top:10px;font-family:var(--mono);font-size:12px;color:var(--gray);text-align:center}
.lane-box{padding:22px 22px 18px}
.lane-box + .lane-box{margin-top:18px}
.lane-box h3{font-size:17px;font-weight:600;display:flex;align-items:center;gap:10px}
.lane-box h3 .keycap{height:26px;min-width:26px;font-size:12px;padding:0 6px;border-radius:7px}
.lane-box .hint{font-size:13.5px;color:var(--gray);margin-top:2px}
.tiles{display:grid;grid-template-columns:repeat(8,1fr);gap:8px;margin-top:16px}
@media(max-width:640px){.tiles{grid-template-columns:repeat(4,1fr)}}
.tile{position:relative;aspect-ratio:1/1;border-radius:12px;background:var(--haze);border:1px solid var(--line-2);overflow:hidden;
  display:flex;flex-direction:column;align-items:center;justify-content:center;transition:background .3s,border-color .3s,transform .3s var(--ease)}
.tile .ic{font-size:18px;line-height:1;opacity:.25}
.tile .tt{font-family:var(--mono);font-size:10.5px;color:var(--gray);margin-top:5px;font-variant-numeric:tabular-nums}
.tile.busy{border-color:rgba(37,99,235,.4);animation:busy 1.2s ease-in-out infinite}
@keyframes busy{50%{background:rgba(37,99,235,.08)}}
.tile.ok{background:var(--ok-soft);border-color:rgba(31,157,97,.35);animation:pop .45s var(--ease)}
.tile.ok .ic{opacity:1;color:var(--ok)}
.tile.bad{background:var(--bad-soft);border-color:rgba(224,71,91,.35);animation:pop .45s var(--ease)}
.tile.bad .ic{opacity:1;color:var(--bad)}
@keyframes pop{0%{transform:scale(.86)}60%{transform:scale(1.06)}100%{transform:scale(1)}}
.pages{display:grid;gap:12px;margin-top:16px}
.pg{border:1px solid var(--line-2);border-radius:14px;padding:12px 14px;background:#fff}
.pg .ph{display:flex;justify-content:space-between;align-items:center;gap:10px;font-size:14px;font-weight:600}
.pg .ph .tm{font-family:var(--mono);font-weight:400;font-size:12.5px;color:var(--gray)}
.pg.busy{border-color:rgba(37,99,235,.4)}
.pg.busy .ph .tm::before{content:"answering… ";color:var(--blue)}
.dots{display:flex;flex-wrap:wrap;gap:5px;margin-top:10px}
.dots i{width:14px;height:14px;border-radius:4px;background:var(--haze-2);transition:background .3s,transform .3s var(--ease)}
.dots i.ok{background:var(--ok);transform:scale(1.08)}
.dots i.bad{background:var(--bad);transform:scale(1.08)}
.feed{margin-top:18px;max-height:340px;overflow:auto;padding:4px 22px 16px}
.feed .fi{animation:rise .5s var(--ease)}

/* results */
.result{margin-top:30px}
.res-hero{display:grid;grid-template-columns:auto 1fr;gap:36px;align-items:center;padding:34px}
@media(max-width:760px){.res-hero{grid-template-columns:1fr;text-align:center}}
.score-big{width:190px;height:190px;border-radius:50%;margin:0 auto;display:flex;flex-direction:column;align-items:center;justify-content:center;color:#fff;
  background:radial-gradient(120% 120% at 30% 20%,#6ea3f5,#2563eb 55%,#173a9e);box-shadow:0 30px 60px -24px rgba(37,99,235,.65),inset 0 1px 0 rgba(255,255,255,.3)}
.score-big .v{font-family:var(--mono);font-size:64px;font-weight:500;line-height:1;font-variant-numeric:tabular-nums}
.score-big .l{font-family:var(--mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;opacity:.85;margin-top:6px}
.res-hero h2{font-family:var(--serif);font-weight:500;font-size:clamp(30px,3.6vw,44px);line-height:1.08}
.res-hero .rank{margin-top:8px;color:var(--gray);font-size:16.5px}
.res-kpis{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:20px}
@media(max-width:760px){.res-kpis{grid-template-columns:repeat(2,1fr)}}
.res-kpis .stat b{font-size:22px}
.share{display:flex;gap:10px;margin-top:20px;flex-wrap:wrap}
@media(max-width:760px){.share{justify-content:center}}
.share input{flex:1;min-width:220px;font-family:var(--mono);font-size:13px;padding:11px 14px;border-radius:11px;border:1px solid var(--line);background:#fff;color:var(--ink-2)}
.catbars{padding:26px;margin-top:18px}
.catbars h3{font-size:18px;font-weight:600}
.cb{display:grid;grid-template-columns:190px 1fr 92px;gap:14px;align-items:center;padding:9px 0}
@media(max-width:640px){.cb{grid-template-columns:1fr 70px}.cb .bar{grid-column:1 / 3;grid-row:2}}
.cb .nm{font-weight:500;font-size:14.5px}
.cb .v{font-family:var(--mono);font-size:13.5px;text-align:right;font-variant-numeric:tabular-nums}
.cb .bar{position:relative;height:10px}
.cb .bar .ref{position:absolute;top:-3px;bottom:-3px;width:2px;background:var(--ink);opacity:.35;border-radius:2px}
.items{padding:6px 26px 18px;margin-top:18px}
.items details{border-bottom:1px solid var(--line-2)}
.items details:last-child{border-bottom:none}
.items summary{cursor:pointer;padding:16px 0;font-weight:600;display:flex;justify-content:space-between;align-items:center;gap:12px}
.items summary::-webkit-details-marker{display:none}
.items summary::before{content:"";width:8px;height:8px;border-right:2px solid var(--gray-2);border-bottom:2px solid var(--gray-2);transform:rotate(-45deg);transition:transform .25s var(--ease);margin-right:4px;flex:none}
.items details[open] summary::before{transform:rotate(45deg)}
.items summary>span:first-of-type{flex:1}
/* one graded answer: mark · question + answer · time (live feed and results) */
.fi{display:grid;grid-template-columns:26px minmax(0,1fr) auto;gap:12px;align-items:start;padding:12px 0;border-top:1px solid var(--line-2)}
.items details .fi:first-of-type{border-top:none}
.fi .mk{width:22px;height:22px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;margin-top:1px}
.fi.ok .mk{background:var(--ok-soft);color:var(--ok)}
.fi.bad .mk{background:var(--bad-soft);color:var(--bad)}
.fi .q{font-size:14.5px;line-height:1.45;color:var(--ink);font-weight:500}
.fi .a{display:flex;flex-wrap:wrap;gap:6px;margin-top:6px;font-size:12.5px}
.fi .a span{font-family:var(--mono);padding:2px 8px;border-radius:7px;background:var(--haze);color:var(--ink-2)}
.fi.bad .a .ans{background:var(--bad-soft);color:#a3283a;text-decoration:line-through;text-decoration-color:rgba(163,40,58,.5)}
.fi .a .want{background:var(--ok-soft);color:#14774a}
.fi .a .err{background:#fff6e5;color:#8a5a00}
.fi .t{font-family:var(--mono);font-size:12px;color:var(--gray);white-space:nowrap;margin-top:3px}
.feed .fi:first-child{border-top:none}

/* toast */
.toast{position:fixed;left:50%;bottom:26px;transform:translateX(-50%) translateY(20px);background:var(--ink);color:#fff;padding:12px 18px;border-radius:12px;
  font-size:14px;opacity:0;pointer-events:none;transition:all .35s var(--ease);z-index:100}
.toast.show{opacity:1;transform:translateX(-50%)}

/* ---------- footer ---------- */
footer{background:#e4ebf8;padding:20px 0 40px}
.foot-grid{display:flex;justify-content:space-between;gap:40px;flex-wrap:wrap;border-top:1px solid rgba(15,26,50,.09);padding-top:44px}
.foot-brand{max-width:300px}
.foot-brand .brand{color:var(--ink)}
.foot-brand .brand svg .ring{stroke:var(--ink)}
.foot-brand .brand svg .bar{fill:var(--blue)}
.foot-brand p{font-size:14px;color:var(--gray);margin-top:13px;line-height:1.6}
.foot-cols{display:flex;gap:60px;flex-wrap:wrap}
.foot-col h5{font-size:13.5px;font-weight:600;color:var(--ink);margin-bottom:14px}
.foot-col a{display:block;font-size:14px;color:var(--gray);margin-bottom:10px;transition:color .2s}
.foot-col a:hover{color:var(--blue)}
.foot-bot{display:flex;justify-content:space-between;align-items:center;gap:18px;flex-wrap:wrap;margin-top:40px;font-size:13px;color:var(--gray)}

/* ---------- page layout: footer always at the bottom ---------- */
body.page{min-height:100vh;display:flex;flex-direction:column}
body.page>main{flex:1}
.nav-links a.here{color:var(--blue);opacity:1;font-weight:600}
.nav-links a.try{color:inherit}
nav.solid .nav-links a.here,nav.scrolled .nav-links a.here{color:var(--blue)}

/* ---------- home: charts stacked, readable ---------- */
.charts.stack{grid-template-columns:1fr}
.scatter-wrap{display:grid;grid-template-columns:minmax(0,1fr) 230px;gap:26px;align-items:start;margin-top:8px}
@media(max-width:880px){.scatter-wrap{grid-template-columns:1fr}}
.scatter .ptl{font-size:12px;font-weight:600;fill:var(--ink);paint-order:stroke;stroke:#f7f9fd;stroke-width:4px;stroke-linejoin:round}
.scatter .lead{stroke:rgba(15,26,50,.5);stroke-width:1;stroke-dasharray:2 2}
.scatter .out{font-family:var(--mono);font-size:10.5px;fill:var(--bad)}
.legend{display:grid;gap:4px;font-size:13.5px}
.legend .lg{display:grid;grid-template-columns:12px 1fr auto;gap:10px;align-items:center;padding:6px 8px;border-radius:9px;cursor:default;transition:background .2s}
.legend .lg:hover,.legend .lg.hl{background:var(--haze)}
.legend .lg .dot{width:10px;height:10px}
.legend .lg b{font-family:var(--mono);font-weight:500;font-size:12px;color:var(--gray)}
.scatter .pt.dim,.scatter .ptl.dim{opacity:.18}
.heat-wrap{overflow-x:auto;margin-top:6px}
.heat.wide{min-width:640px}
.heat.wide td{height:38px;font-size:12.5px;min-width:0}
.heat.wide th{font-size:10.5px}

/* ---------- home: what we test, as real cards ---------- */
.sample{margin-top:18px;border-radius:16px;background:#fff;border:1px solid var(--line);box-shadow:0 14px 34px -24px rgba(15,26,50,.35);padding:18px 18px 14px;min-height:258px;display:flex;flex-direction:column}
.sample .sh{display:flex;justify-content:space-between;align-items:center;gap:10px}
.sample .sq{font-size:16px;font-weight:600;line-height:1.4;margin-top:12px;min-height:46px}
.sample .so{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:12px}
.sample .so span{font-size:13.5px;padding:8px 11px;border-radius:10px;border:1px solid var(--line);color:var(--ink-2);transition:all .35s var(--ease)}
.sample .so span.hit{border-color:rgba(31,157,97,.55);background:var(--ok-soft);color:#14774a;font-weight:600}
.sample .sf{display:flex;justify-content:space-between;align-items:center;margin-top:auto;padding-top:12px;font-family:var(--mono);font-size:11.5px;color:var(--gray)}
.sample .pips{display:flex;gap:4px}
.sample .pips i{width:6px;height:6px;border-radius:50%;background:var(--haze-2);transition:background .3s}
.sample .pips i.on{background:var(--blue)}
.fade-swap{animation:fadeSwap .5s var(--ease)}
@keyframes fadeSwap{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.pagelist{margin-top:18px;display:grid;gap:8px}
.pagelist .pl{display:grid;grid-template-columns:38px 1fr auto;gap:12px;align-items:center;padding:11px 14px;border-radius:14px;background:#fff;border:1px solid var(--line)}
.pagelist .pl .ix{width:38px;height:38px;border-radius:11px;background:var(--blue-soft);color:var(--blue);display:flex;align-items:center;justify-content:center;font-family:var(--mono);font-size:13px;font-weight:600}
.pagelist .pl b{display:block;font-size:14.5px;font-weight:600}
.pagelist .pl small{display:block;font-size:12.5px;color:var(--gray);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.pagelist .pl .n{font-family:var(--mono);font-size:12px;color:var(--gray);white-space:nowrap}
.pl-body{min-width:0}

/* ---------- home: try-it teaser ---------- */
.doors{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:36px}
@media(max-width:880px){.doors{grid-template-columns:1fr}}
.door{display:flex;flex-direction:column;gap:8px;padding:26px;border-radius:22px;background:#fff;border:1px solid var(--line);
  box-shadow:0 20px 50px -38px rgba(15,26,50,.4);transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .2s}
.door:hover{transform:translateY(-3px);border-color:rgba(37,99,235,.35);box-shadow:0 26px 60px -34px rgba(37,99,235,.35)}
.door .di{width:46px;height:46px;border-radius:14px;display:flex;align-items:center;justify-content:center;background:var(--blue-soft);color:var(--blue)}
.door h3{font-size:20px;font-weight:600;letter-spacing:-0.01em;margin-top:6px}
.door p{font-size:15px;color:var(--gray)}
.door .go{margin-top:auto;padding-top:8px;font-weight:600;font-size:14.5px;color:var(--blue)}
.door .tag{align-self:flex-start;font-family:var(--mono);font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;padding:3px 9px;border-radius:100px;background:var(--haze);color:var(--gray)}

/* ---------- run page: richer gate ---------- */
.gate-grid{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:22px;margin-top:20px;align-items:start}
@media(max-width:880px){.gate-grid{grid-template-columns:1fr}}
.gate-grid .gate{margin:0;max-width:none;text-align:left;padding:30px}
.gate-steps{display:grid;gap:12px;margin-top:22px}
.gate-steps div{display:grid;grid-template-columns:30px 1fr;gap:12px;align-items:start;font-size:15px;color:var(--ink-2)}
.gate-steps b{width:30px;height:30px;border-radius:50%;background:var(--blue-soft);color:var(--blue);display:flex;align-items:center;justify-content:center;font-family:var(--mono);font-size:13px}
.gate-side{padding:24px}
.gate-side h4{font-size:15px;font-weight:600}
.gate-side .mini{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:12px;align-items:center;padding:12px 0;border-top:1px solid var(--line-2)}
.gate-side .mini:first-of-type{border-top:none}
.gate-side .mini .sc{font-family:var(--mono);font-size:20px}
.gate-alt{margin-top:16px;padding:18px 20px;border-radius:16px;background:var(--haze);font-size:14.5px;color:var(--ink-2)}
.gate-alt a{color:var(--blue);font-weight:600}

/* ---------- shortcut check ---------- */
.status-bar{display:flex;justify-content:space-between;align-items:center;gap:18px;flex-wrap:wrap;padding:16px 22px;margin-top:22px}
.estatus{display:flex;align-items:center;gap:12px;font-size:15px}
.estatus .sd{width:10px;height:10px;border-radius:50%;background:var(--gray-2);flex:none}
.estatus.on .sd{background:var(--ok);box-shadow:0 0 0 5px rgba(31,157,97,.15)}
.estatus.wait .sd{background:var(--amber);animation:livePulse 1.4s ease-in-out infinite}
.estatus.off .sd{background:var(--bad)}
.estatus small{display:block;font-size:13px;color:var(--gray)}
.progress-pill{font-family:var(--mono);font-size:13px;color:var(--ink-2);padding:7px 13px;border-radius:100px;background:var(--haze)}
.keys-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:20px}
@media(max-width:880px){.keys-grid{grid-template-columns:1fr}}
.kcard{position:relative;padding:26px 24px 22px;border-radius:24px;background:#fff;border:1.5px solid var(--line);
  box-shadow:0 22px 50px -40px rgba(15,26,50,.45);transition:border-color .3s,box-shadow .4s var(--ease),background .4s,transform .4s var(--ease)}
.kcard .caps{display:flex;gap:8px}
.kcard .keycap{min-width:50px;height:52px;font-size:20px;border-radius:12px;box-shadow:0 3.5px 0 rgba(15,26,50,.14),inset 0 1px 0 #fff;transition:all .35s var(--ease)}
.kcard h3{font-size:21px;font-weight:600;margin-top:20px;letter-spacing:-0.01em}
.kcard p{font-size:14.5px;color:var(--gray);margin-top:4px}
.kcard .note{margin-top:12px;font-size:12.5px;color:#8a5a00;background:#fff6e5;border-radius:10px;padding:8px 10px}
.kcard .st{position:absolute;top:22px;right:20px;font-family:var(--mono);font-size:11px;letter-spacing:.06em;text-transform:uppercase;padding:4px 10px;border-radius:100px;background:var(--haze);color:var(--gray)}
.kcard.next{border-color:rgba(37,99,235,.5);box-shadow:0 0 0 6px rgba(37,99,235,.07),0 22px 50px -36px rgba(37,99,235,.5)}
.kcard.next .st{background:var(--blue-soft);color:var(--blue)}
.kcard.next .keycap{animation:capPulse 1.8s ease-in-out infinite}
.kcard.next .keycap:nth-child(2){animation-delay:.15s}.kcard.next .keycap:nth-child(3){animation-delay:.3s}
@keyframes capPulse{0%,70%,100%{transform:none}35%{transform:translateY(2px);box-shadow:0 1.5px 0 rgba(15,26,50,.14),inset 0 1px 0 #fff}}
.kcard.ok{border-color:rgba(31,157,97,.55);background:linear-gradient(180deg,#f2fbf6,#fff 60%);transform:translateY(-2px)}
.kcard.ok .st{background:var(--ok);color:#fff}
.kcard.ok .keycap{background:linear-gradient(180deg,#eafaf1,#d9f3e5);border-color:rgba(31,157,97,.35);color:#14774a}
.kcard.idle{opacity:.55}
.kcard .tm{margin-top:14px;font-family:var(--mono);font-size:12px;color:var(--ok);min-height:16px}
.opt-keys{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}
.ok-chip{display:inline-flex;align-items:center;gap:10px;padding:10px 14px;border-radius:14px;background:#fff;border:1px solid var(--line);font-size:14px}
.ok-chip .keycap{height:28px;min-width:28px;font-size:12px;padding:0 7px;border-radius:7px}
.ok-chip.ok{border-color:rgba(31,157,97,.45);background:var(--ok-soft)}
.ok-chip .s{font-family:var(--mono);font-size:11px;color:var(--gray)}
.ok-chip.ok .s{color:var(--ok)}
.done-panel{margin-top:22px;padding:30px;display:grid;grid-template-columns:auto 1fr auto;gap:24px;align-items:center;
  background:radial-gradient(120% 140% at 0% 0%,#eafaf1,#f7fbff 60%);border-color:rgba(31,157,97,.25)}
@media(max-width:760px){.done-panel{grid-template-columns:1fr;text-align:center}}
.done-panel .big-ok{width:64px;height:64px;border-radius:50%;background:var(--ok);color:#fff;display:flex;align-items:center;justify-content:center;font-size:30px;margin:0 auto;
  box-shadow:0 14px 30px -12px rgba(31,157,97,.6);animation:pop .6s var(--ease)}
.done-panel h3{font-family:var(--serif);font-weight:500;font-size:32px;line-height:1.1}
.done-panel p{color:var(--gray);margin-top:4px}
.done-panel .acts{display:flex;gap:10px;flex-wrap:wrap;justify-content:flex-end}
@media(max-width:760px){.done-panel .acts{justify-content:center}}
.notice{margin-top:22px;padding:22px 24px;border-radius:20px;display:grid;grid-template-columns:auto 1fr auto;gap:18px;align-items:center}
@media(max-width:760px){.notice{grid-template-columns:1fr}}
.notice .ni{width:44px;height:44px;border-radius:13px;display:flex;align-items:center;justify-content:center;background:#fff6e5;color:#b46b00;font-size:20px}
.notice h4{font-size:17px;font-weight:600}
.notice p{font-size:14.5px;color:var(--gray);margin-top:2px}
.help{max-width:820px;margin:46px auto 0}
.help h3{font-size:22px;font-weight:600;margin-bottom:6px}
.copyline{display:inline-flex;align-items:center;gap:8px;margin-top:8px}
.copyline code{font-family:var(--mono);font-size:13px;padding:6px 10px;border-radius:9px;background:var(--haze);color:var(--ink)}

/* ---------- try it yourself: ask the models ---------- */
.ask{display:grid;gap:18px;margin-top:22px}
.ask-in{padding:22px}
.ask-in textarea{width:100%;min-height:118px;resize:vertical;font:inherit;font-size:16.5px;line-height:1.5;padding:14px 16px;border-radius:14px;border:1px solid var(--line);
  background:#fff;color:var(--ink);outline:none;transition:border-color .2s,box-shadow .2s}
.ask-in textarea:focus{border-color:rgba(37,99,235,.55);box-shadow:0 0 0 4px rgba(37,99,235,.1)}
.ask-row{display:flex;justify-content:space-between;align-items:center;gap:14px;flex-wrap:wrap;margin-top:14px}
.drop{display:flex;align-items:center;gap:12px;padding:10px 12px;border-radius:14px;border:1.5px dashed rgba(15,26,50,.18);background:#fff;font-size:14px;color:var(--gray);cursor:pointer;transition:all .2s;max-width:100%}
.drop:hover,.drop.over{border-color:var(--blue);background:var(--blue-soft);color:var(--blue)}
.drop img{width:54px;height:40px;object-fit:cover;border-radius:8px;border:1px solid var(--line)}
.drop .x{margin-left:4px;width:22px;height:22px;border-radius:50%;border:none;background:var(--haze);cursor:pointer;color:var(--ink-2)}
.ex{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px;align-items:center}
.ex .lbl{font-family:var(--mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--gray);margin-right:2px}
.ex button{font-size:13.5px;padding:7px 12px;border-radius:100px;border:1px solid var(--line);background:#fff;cursor:pointer;transition:all .2s;color:var(--ink-2)}
.ex button:hover{border-color:var(--blue);color:var(--blue)}
.mchips{display:flex;gap:8px;flex-wrap:wrap}
.mchip{display:inline-flex;align-items:center;gap:9px;padding:7px 12px 7px 8px;border-radius:100px;border:1.5px solid var(--line);background:#fff;cursor:pointer;font-size:14px;font-weight:500;transition:all .2s}
.mchip .av{width:22px;height:22px;border-radius:7px;font-size:10px}
.mchip.on{border-color:var(--blue);background:var(--blue-soft)}
.mchip:not(.on){opacity:.6}
.ask-go{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.ask-note{font-size:13px;color:var(--gray)}
.answers{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
@media(max-width:980px){.answers{grid-template-columns:1fr}}
.acol{padding:20px;display:flex;flex-direction:column;min-height:210px;transition:border-color .3s,box-shadow .3s}
.acol .ah{display:flex;justify-content:space-between;align-items:center;gap:10px}
.acol .ab{font-size:15.5px;line-height:1.6;white-space:pre-wrap;word-break:break-word;margin-top:14px;flex:1;color:var(--ink)}
.acol .ab.none{color:var(--gray);font-style:italic}
.acol .am{display:flex;gap:14px;flex-wrap:wrap;margin-top:14px;padding-top:12px;border-top:1px solid var(--line-2);font-family:var(--mono);font-size:12px;color:var(--gray)}
.acol .am b{color:var(--ink);font-weight:500}
.acol.first{border-color:rgba(31,157,97,.45);box-shadow:0 0 0 4px rgba(31,157,97,.07),0 20px 50px -34px rgba(31,157,97,.4)}
.acol .badge{font-family:var(--mono);font-size:10.5px;letter-spacing:.06em;text-transform:uppercase;padding:3px 9px;border-radius:100px;background:var(--haze);color:var(--gray);white-space:nowrap}
.acol .badge.fast{background:var(--ok);color:#fff}
.acol .badge.err{background:var(--bad-soft);color:var(--bad)}
.caret{display:inline-block;width:8px;height:1.05em;margin-left:2px;background:var(--blue);border-radius:2px;vertical-align:text-bottom;animation:blink 1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
.ask-sum{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;padding:14px 20px;font-size:14px;color:var(--ink-2)}
.ask-sum b{font-weight:600;color:var(--ink)}
.ask-gate{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;padding:16px 18px;border-radius:16px;background:var(--haze);margin-top:14px;font-size:14.5px;color:var(--ink-2)}

/* ---------- practice sets ---------- */
.sets{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:22px}
@media(max-width:980px){.sets{grid-template-columns:repeat(2,1fr)}}
@media(max-width:620px){.sets{grid-template-columns:1fr}}
.set{display:flex;flex-direction:column;gap:6px;padding:22px;border-radius:20px;background:#fff;border:1px solid var(--line);transition:transform .3s var(--ease),border-color .2s,box-shadow .3s var(--ease)}
.set:hover{transform:translateY(-2px);border-color:rgba(37,99,235,.35);box-shadow:0 22px 50px -36px rgba(37,99,235,.4)}
.set .si{display:flex;justify-content:space-between;align-items:center}
.set .sic{width:40px;height:40px;border-radius:12px;background:var(--blue-soft);color:var(--blue);display:flex;align-items:center;justify-content:center}
.set h4{font-size:17.5px;font-weight:600;margin-top:10px}
.set p{font-size:14px;color:var(--gray)}
.set .sk{display:flex;gap:6px;flex-wrap:wrap;margin-top:auto;padding-top:12px}
.set .sk .keycap{height:26px;min-width:26px;font-size:11.5px;padding:0 6px;border-radius:7px}
.set .sk .w{font-size:12px;color:var(--gray);align-self:center;margin-left:2px;margin-right:6px}

/* ---------- practice page: the exam sheet ---------- */
.p-head{padding:104px 0 18px;background:linear-gradient(180deg,#eaf1fd,#ffffff)}
.crumbs{font-family:var(--mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--gray)}
.crumbs a{color:var(--blue)}
.p-head h1{font-family:var(--serif);font-weight:500;font-size:clamp(34px,4.4vw,52px);line-height:1.04;margin-top:10px}
.p-head p{color:var(--gray);margin-top:8px;max-width:640px}
.tryline{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
.tryline .tl{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:12px;background:#fff;border:1px solid var(--line);font-size:13.5px;color:var(--ink-2)}
.tryline .keycap{height:26px;min-width:26px;font-size:11.5px;padding:0 6px;border-radius:7px}
.tryline .pro{font-family:var(--mono);font-size:10px;letter-spacing:.06em;color:var(--blue);border:1px solid rgba(37,99,235,.3);border-radius:6px;padding:1px 5px}
.sheet{margin-top:22px;background:#fff;border:1px solid var(--line);border-radius:22px;overflow:hidden;box-shadow:0 30px 70px -50px rgba(15,26,50,.45)}
.sheet-head{display:flex;justify-content:space-between;align-items:center;gap:14px;flex-wrap:wrap;padding:16px 24px;border-bottom:1px solid var(--line-2);background:linear-gradient(180deg,#fbfcfe,#f5f8fc)}
.course{display:flex;align-items:center;gap:12px}
.course .ci{width:34px;height:34px;border-radius:10px;background:#1f9d61;color:#fff;font-weight:700;display:flex;align-items:center;justify-content:center;font-size:15px}
.course b{display:block;font-size:15px}
.course small{display:block;font-size:12.5px;color:var(--gray)}
.sheet-meta{display:flex;gap:16px;font-family:var(--mono);font-size:12.5px;color:var(--gray);align-items:center}
.pagebar{display:flex;gap:6px}
.pagebar i{width:26px;height:5px;border-radius:5px;background:var(--haze-2)}
.pagebar i.on{background:var(--blue)}
.qb{border:0;margin:0;padding:24px 26px;border-top:1px solid var(--line-2);min-width:0;transition:background .4s}
.qb:first-of-type{border-top:none}
.qb legend,.qb .qt{float:left;width:100%;display:flex;gap:12px;font-size:16.5px;font-weight:600;line-height:1.45;padding:0;margin-bottom:12px}
.qb legend+*{clear:both}
.qb .qn{flex:none;width:28px;height:28px;border-radius:9px;background:var(--haze);color:var(--ink-2);font-family:var(--mono);font-size:12.5px;display:flex;align-items:center;justify-content:center;margin-top:-1px}
.qb .hint{font-size:13px;color:var(--gray);margin:-6px 0 10px 40px}
.opts{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;margin-left:40px}
@media(max-width:620px){.opts{grid-template-columns:1fr;margin-left:0}}
.opt{display:flex;align-items:center;gap:12px;padding:11px 14px;border:1.5px solid var(--line);border-radius:12px;cursor:pointer;font-size:15px;background:#fff;transition:border-color .2s,background .2s}
.opt:hover{border-color:rgba(37,99,235,.4)}
.opt input{width:18px;height:18px;accent-color:var(--blue);margin:0;flex:none}
.opt:has(input:checked){border-color:var(--blue);background:var(--blue-soft)}
.field{margin-left:40px;display:flex;flex-direction:column;gap:6px;max-width:420px}
@media(max-width:620px){.field{margin-left:0}}
.field label{font-size:13px;color:var(--gray)}
.inp{font:inherit;font-size:15.5px;padding:11px 14px;border-radius:12px;border:1.5px solid var(--line);background:#fff;color:var(--ink);outline:none;transition:border-color .2s,box-shadow .2s;width:100%}
.inp:focus{border-color:rgba(37,99,235,.6);box-shadow:0 0 0 4px rgba(37,99,235,.1)}
select.inp{appearance:none;background:#fff url("data:image/svg+xml,%3Csvg width='10' height='6' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%2368758d' fill='none' stroke-width='1.6' stroke-linecap='round'/%3E%3C/svg%3E") no-repeat right 14px center;padding-right:36px;cursor:pointer}
.cards{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;margin-left:40px}
@media(max-width:760px){.cards{grid-template-columns:repeat(2,minmax(0,1fr));margin-left:0}}
.card-opt{padding:16px 12px;border-radius:14px;border:1.5px solid var(--line);background:#fff;text-align:center;font-size:15px;font-weight:500;cursor:pointer;transition:all .2s;user-select:none}
.card-opt:hover{border-color:rgba(37,99,235,.4)}
.card-opt[aria-checked="true"]{border-color:var(--blue);background:var(--blue-soft);color:var(--blue-2)}
.card-opt:focus-visible{outline:3px solid rgba(37,99,235,.3);outline-offset:2px}
.qb .verdict{display:none;margin:12px 0 0 40px;font-size:13.5px;font-weight:600}
.qb.right{background:linear-gradient(90deg,rgba(31,157,97,.06),transparent 60%)}
.qb.wrong{background:linear-gradient(90deg,rgba(224,71,91,.06),transparent 60%)}
.qb.right .verdict,.qb.wrong .verdict{display:block}
.qb.right .verdict{color:var(--ok)}
.qb.wrong .verdict{color:var(--bad)}
.qb.right .qn{background:var(--ok);color:#fff}
.qb.wrong .qn{background:var(--bad);color:#fff}
.sheet-foot{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;padding:18px 24px;border-top:1px solid var(--line-2);background:#fafbfd}
.pres{display:none}
.pres.show{display:grid;grid-template-columns:auto 1fr auto;gap:22px;align-items:center;margin-top:22px;padding:24px 26px}
@media(max-width:760px){.pres.show{grid-template-columns:1fr;text-align:center}}
.pres .rs{width:96px;height:96px;border-radius:50%;margin:0 auto;display:flex;flex-direction:column;align-items:center;justify-content:center;color:#fff;
  background:radial-gradient(120% 120% at 30% 20%,#6ea3f5,#2563eb 55%,#173a9e);box-shadow:0 20px 40px -18px rgba(37,99,235,.6)}
.pres.full .rs{background:radial-gradient(120% 120% at 30% 20%,#6fe0a4,#1f9d61 60%,#137446)}
.pres .rs b{font-family:var(--mono);font-size:26px;font-weight:500;line-height:1}
.pres .rs span{font-family:var(--mono);font-size:10px;letter-spacing:.1em;text-transform:uppercase;opacity:.85;margin-top:3px}
.pres h3{font-family:var(--serif);font-weight:500;font-size:30px;line-height:1.1}
.pres p{color:var(--gray);margin-top:4px}
.article{padding:30px 34px;font-family:var(--serif);font-size:19.5px;line-height:1.65;color:#1d2433}
.article h2{font-family:var(--serif);font-weight:500;font-size:30px;line-height:1.15;margin-bottom:12px}
.article p+p{margin-top:16px}
.article .by{font-family:var(--mono);font-size:12px;color:var(--gray);letter-spacing:.06em;text-transform:uppercase;margin-bottom:16px}
.page-head .door p{margin:0;max-width:none;font-size:15px;color:var(--gray)}
.page-head .doors{margin-top:30px}
.page-head h1 em{font-style:italic}
.acol .ab code{font-family:var(--mono);font-size:.88em;background:var(--haze);padding:1px 6px;border-radius:6px}
.acol .ab .math{font-family:var(--serif);font-size:1.08em}
.ex-cap{font-size:14px;color:var(--gray);margin:2px 2px -4px}
.ex-cap b{font-family:var(--mono);font-weight:500;font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--blue)}
.answers.example .acol{opacity:.82}
@media(max-width:640px){.scatter .ptl,.scatter .lead{display:none}.legend .lg{padding:5px 6px;font-size:13px}}