/* BDX Bench site — amber -> violet arena. System fonts only, no external requests. */
:root{
  --bg:#fffaf3;--bg2:#f6efff;--fg:#1b1230;--muted:#5d5376;--card:#ffffff;--line:#e6dcf4;
  --amber:#ffb02e;--amber-t:#a85a00;--violet:#7c3aed;--violet-t:#5b21b6;--orchid:#c084fc;
  --ink-on-grad:#1a0f2e;--code-bg:#16102a;--code-fg:#efe9fb;--code-mut:#9a8fbb;
  --shadow:0 18px 50px -22px rgba(91,33,182,.35);--glow1:rgba(255,176,46,.28);--glow2:rgba(124,58,237,.20);
  --grid:rgba(91,33,182,.07);--ok:#0f8a5f;
  --mono:ui-monospace,SFMono-Regular,"Cascadia Code",Menlo,Consolas,monospace;
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --rh:46px;
}
@media (prefers-color-scheme:dark){:root{
  --bg:#0c0816;--bg2:#120a24;--fg:#f5effd;--muted:#b4a8cf;--card:#171029;--line:#2c2249;
  --amber-t:#ffc361;--violet-t:#b79bff;--violet:#8b5cf6;
  --shadow:0 22px 60px -24px rgba(0,0,0,.8);--glow1:rgba(255,176,46,.16);--glow2:rgba(139,92,246,.28);
  --grid:rgba(183,155,255,.07);--ok:#4ade9f;--code-bg:#0a0615;
}}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;font:16px/1.65 var(--sans);color:var(--fg);background:var(--bg);overflow-x:hidden}
img,svg{max-width:100%}
a{color:var(--violet-t);text-underline-offset:3px}
a:hover{color:var(--amber-t)}
code,pre,.mono{font-family:var(--mono)}
code{font-size:.88em;background:color-mix(in srgb,var(--violet) 12%,transparent);padding:.1em .38em;border-radius:6px}
:focus-visible{outline:3px solid var(--amber);outline-offset:3px;border-radius:6px}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-999px;top:8px;background:var(--amber);color:var(--ink-on-grad);padding:8px 14px;border-radius:8px;z-index:99}
.skip:focus{left:8px}
.grad{background:linear-gradient(95deg,var(--amber) 0%,#ff7a59 38%,var(--violet) 78%,var(--orchid));-webkit-background-clip:text;background-clip:text;color:transparent}

/* nav */
.nav{position:sticky;top:0;z-index:50;backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);background:color-mix(in srgb,var(--bg) 82%,transparent);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;gap:18px;height:60px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;letter-spacing:-.01em;color:var(--fg);text-decoration:none;font-size:1.08rem}
.brand svg{width:30px;height:30px;flex:none}
.nav ul{display:flex;gap:4px;list-style:none;margin:0 0 0 auto;padding:0}
.nav ul a{display:block;padding:8px 11px;border-radius:9px;color:var(--muted);text-decoration:none;font-size:.92rem;font-weight:600}
.nav ul a:hover{color:var(--fg);background:color-mix(in srgb,var(--violet) 10%,transparent)}
.nav .gh{margin-left:6px}
@media (max-width:860px){.nav ul li:not(.keep){display:none}.nav ul{margin-left:auto}}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 22px;border-radius:12px;font-weight:700;text-decoration:none;border:1.5px solid var(--line);color:var(--fg);background:var(--card);transition:transform .2s,box-shadow .2s,border-color .2s}
.btn:hover{transform:translateY(-2px);border-color:var(--violet);color:var(--fg);box-shadow:var(--shadow)}
.btn.primary{border:0;color:var(--ink-on-grad);background:linear-gradient(95deg,#ffb02e,#ff9d6a 45%,#c084fc)}
.btn.primary:hover{color:var(--ink-on-grad);box-shadow:0 14px 40px -12px rgba(255,140,60,.6)}
.btn.sm{padding:9px 16px;font-size:.9rem}
.cta{display:flex;flex-wrap:wrap;gap:10px;margin:26px 0 0}.cta .btn{padding:13px 18px}

/* hero */
.hero{position:relative;padding:64px 0 76px;overflow:hidden;isolation:isolate}
.hero::before{content:"";position:absolute;inset:0;z-index:-2;background:
  radial-gradient(700px 420px at 12% 0%,var(--glow1),transparent 70%),
  radial-gradient(760px 520px at 92% 18%,var(--glow2),transparent 70%),var(--bg)}
.hero::after{content:"";position:absolute;inset:0;z-index:-1;background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:44px 44px;mask-image:linear-gradient(180deg,#000,transparent 85%);-webkit-mask-image:linear-gradient(180deg,#000,transparent 85%)}
.orb{position:absolute;border-radius:50%;filter:blur(60px);z-index:-1;opacity:.55;animation:drift 14s ease-in-out infinite alternate}
.orb.a{width:280px;height:280px;background:var(--amber);left:-80px;top:120px;opacity:.28}
.orb.b{width:340px;height:340px;background:var(--violet);right:-100px;top:-60px;animation-delay:-5s;opacity:.3}
@keyframes drift{to{transform:translate(40px,30px) scale(1.12)}}
.hero-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.08fr);gap:44px;align-items:center}
@media (max-width:980px){.hero-grid{grid-template-columns:1fr;gap:34px}}
.eyebrow{display:inline-flex;align-items:center;gap:9px;font-size:.78rem;letter-spacing:.12em;text-transform:uppercase;font-weight:800;color:var(--amber-t);margin:0 0 14px}
.eyebrow i{width:9px;height:9px;border-radius:50%;background:var(--amber);box-shadow:0 0 0 0 var(--amber);animation:ping 2.2s infinite}
@keyframes ping{70%,100%{box-shadow:0 0 0 12px transparent}}
h1{font-size:clamp(2.7rem,6.4vw,4.7rem);line-height:1.02;letter-spacing:-.035em;margin:0 0 18px;font-weight:900}
.lede{font-size:clamp(1.05rem,1.8vw,1.25rem);color:var(--muted);max-width:34em;margin:0}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin:22px 0 0;padding:0;list-style:none}
.chips li{font-size:.82rem;font-weight:700;padding:6px 12px;border-radius:99px;border:1px solid var(--line);background:color-mix(in srgb,var(--card) 80%,transparent);color:var(--muted)}
.chips b{color:var(--fg)}

/* leaderboard card */
.lb{background:color-mix(in srgb,var(--card) 92%,transparent);border:1px solid var(--line);border-radius:22px;padding:18px 18px 14px;box-shadow:var(--shadow);position:relative}
.lb-head{display:flex;justify-content:space-between;align-items:baseline;gap:10px;margin:0 2px 10px}
.lb-title{font-weight:800;font-size:.95rem;letter-spacing:-.01em}
.lb-sub{font-size:.76rem;color:var(--muted);font-family:var(--mono)}
.lb-tabs{display:none;gap:6px;flex-wrap:wrap;margin:0 0 12px}
.js .lb-tabs{display:flex}
.lb-tabs button{font:inherit;font-size:.78rem;font-weight:700;padding:6px 11px;border-radius:99px;border:1px solid var(--line);background:transparent;color:var(--muted);cursor:pointer;transition:all .2s}
.lb-tabs button:hover{color:var(--fg);border-color:var(--violet)}
.lb-tabs button[aria-pressed=true]{color:var(--ink-on-grad);border-color:transparent;background:linear-gradient(95deg,#ffb02e,#c084fc)}
.rows{list-style:none;margin:0;padding:0;position:relative;height:calc(var(--rh)*9)}
.row{position:absolute;left:0;right:0;top:0;height:var(--rh);display:grid;grid-template-columns:26px minmax(0,150px) minmax(0,1fr) 52px;align-items:center;gap:10px;transform:translateY(calc(var(--i)*var(--rh)));transition:transform .85s cubic-bezier(.65,0,.25,1)}
.rk{font:700 .8rem var(--mono);color:var(--muted);text-align:right}
.nm{font-weight:700;font-size:.9rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.bar{height:16px;border-radius:99px;background:color-mix(in srgb,var(--violet) 11%,transparent);overflow:hidden}
.bar i{display:block;height:100%;width:100%;border-radius:99px;transform-origin:left center;transform:scaleX(var(--s));background:linear-gradient(90deg,var(--amber),#ff7a59 40%,var(--violet) 100%);transition:transform .95s cubic-bezier(.65,0,.25,1);animation:grow 1.3s cubic-bezier(.2,.8,.2,1) backwards;animation-delay:calc(var(--k,0)*70ms)}
.row.lead .bar i{box-shadow:0 0 18px -2px rgba(255,150,60,.65)}
@keyframes grow{from{transform:scaleX(0)}}
.sc{font:800 .92rem var(--mono);text-align:right;color:var(--fg)}
.row.lead .nm,.row.lead .rk{color:var(--amber-t)}
.lb-foot{font-size:.74rem;color:var(--muted);margin:12px 2px 0;line-height:1.5}
@media (max-width:560px){
  :root{--rh:54px}
  .row{grid-template-columns:22px minmax(0,1fr) 46px;grid-template-areas:"rk nm sc" "rk bar bar";row-gap:4px;align-content:center}
  .rk{grid-area:rk;align-self:start;padding-top:2px}.nm{grid-area:nm}.sc{grid-area:sc}.bar{grid-area:bar;height:12px}
  .lb{padding:14px 12px 12px}
}

/* sections */
section{padding:84px 0;position:relative}
section.alt{background:var(--bg2)}
.sec-head{max-width:46em;margin:0 0 38px}
.kicker{font-size:.76rem;letter-spacing:.14em;text-transform:uppercase;font-weight:800;color:var(--amber-t);margin:0 0 10px}
h2{font-size:clamp(1.8rem,3.8vw,2.7rem);line-height:1.1;letter-spacing:-.028em;margin:0 0 14px;font-weight:850}
h3{font-size:1.18rem;margin:0 0 8px;letter-spacing:-.01em}
.sec-head p{color:var(--muted);margin:0;font-size:1.06rem}
.grid{display:grid;gap:18px}
.g3{grid-template-columns:repeat(3,minmax(0,1fr))}.g2{grid-template-columns:repeat(2,minmax(0,1fr))}.g4{grid-template-columns:repeat(4,minmax(0,1fr))}
@media (max-width:900px){.g3,.g4{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:640px){.g3,.g2,.g4{grid-template-columns:1fr}}
.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:24px;transition:transform .25s,box-shadow .25s,border-color .25s;position:relative}
.card:hover{transform:translateY(-4px);border-color:color-mix(in srgb,var(--violet) 55%,var(--line));box-shadow:var(--shadow)}
.card p{margin:0;color:var(--muted)}
.card p+p{margin-top:10px}
.ico{width:44px;height:44px;border-radius:13px;display:grid;place-items:center;margin:0 0 14px;background:linear-gradient(135deg,color-mix(in srgb,var(--amber) 30%,transparent),color-mix(in srgb,var(--violet) 28%,transparent));font-size:1.35rem}
.tag{display:inline-block;font:700 .72rem var(--mono);padding:3px 9px;border-radius:99px;background:color-mix(in srgb,var(--amber) 22%,transparent);color:var(--amber-t);margin-bottom:12px}
.tag.v{background:color-mix(in srgb,var(--violet) 18%,transparent);color:var(--violet-t)}

/* stats */
.stats{padding:0;margin-top:-30px;z-index:2}
.stat-row{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));background:var(--card);border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);overflow:hidden}
.stat{padding:22px 18px;text-align:center;border-right:1px solid var(--line)}
.stat:last-child{border:0}
.stat b{display:block;font:900 2.1rem/1 var(--mono);letter-spacing:-.04em}
.stat span{display:block;font-size:.82rem;color:var(--muted);margin-top:8px}
@media (max-width:860px){.stat-row{grid-template-columns:repeat(2,1fr)}.stat{border-bottom:1px solid var(--line)}.stat:nth-child(2n){border-right:0}.stat:last-child{grid-column:1/-1;border-bottom:0}}

/* dimension bars */
.dims{display:grid;gap:14px;margin:6px 0 0}
.dim{display:grid;grid-template-columns:minmax(0,200px) 1fr 54px;gap:14px;align-items:center}
.dim b{font-size:.92rem}.dim small{color:var(--muted);display:block;font-weight:400;font-size:.78rem;line-height:1.35}
.dim .bar{height:12px}
.dim .bar i{animation:none;transform:scaleX(1);transition:transform 1.2s cubic-bezier(.2,.8,.2,1)}
.js .rv:not(.in) .dim .bar i{transform:scaleX(0)}
.dim .mono{text-align:right;font-weight:800;font-size:.88rem}
@media (max-width:600px){.dim{grid-template-columns:1fr 46px}.dim>div:first-child{grid-column:1/-1}}
.quote{border-left:4px solid var(--amber);background:color-mix(in srgb,var(--amber) 10%,transparent);padding:16px 20px;border-radius:0 14px 14px 0;margin:22px 0;font-size:1.05rem}
.quote cite{display:block;font-size:.8rem;color:var(--muted);margin-top:6px;font-style:normal}
.prompt-box{font:600 .98rem/1.55 var(--mono);background:var(--code-bg);color:var(--code-fg);padding:18px 20px;border-radius:16px;border:1px solid var(--line);position:relative;overflow-wrap:anywhere}
.prompt-box::before{content:"verbatim prompt, every model";display:block;font:700 .68rem var(--sans);letter-spacing:.12em;text-transform:uppercase;color:var(--amber);margin-bottom:8px}
.split{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:40px;align-items:start}
@media (max-width:900px){.split{grid-template-columns:1fr;gap:28px}}

/* matrix */
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:18px;background:var(--card);-webkit-overflow-scrolling:touch}
table{border-collapse:collapse;width:100%;min-width:640px;font-size:.92rem}
th,td{padding:11px 14px;text-align:center;border-bottom:1px solid var(--line)}
th{font-size:.74rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);font-weight:800;background:color-mix(in srgb,var(--violet) 6%,transparent)}
th:first-child,td:first-child{text-align:left}
tr:last-child td{border-bottom:0}
td.h{font:800 .92rem var(--mono);background:color-mix(in srgb,var(--violet) calc(var(--p)*.5%),transparent)}
td.h.t{background:color-mix(in srgb,var(--amber) calc(var(--p)*.55%),transparent)}
td small{display:block;color:var(--muted);font-size:.74rem}
td small a{color:var(--violet-t)}
.note{font-size:.84rem;color:var(--muted);margin:12px 4px 0}

/* suites */
.task-list{list-style:none;margin:14px 0 0;padding:0;display:grid;gap:8px}
.task-list li{display:flex;gap:10px;align-items:baseline;padding:9px 12px;border-radius:11px;background:color-mix(in srgb,var(--violet) 6%,transparent);font-size:.93rem}
.task-list code{background:none;padding:0;color:var(--amber-t);font-weight:700;flex:none}
.task-list em{margin-left:auto;font-style:normal;font-size:.72rem;color:var(--muted);font-family:var(--mono);flex:none}
.formula{font:600 .9rem/1.6 var(--mono);background:var(--code-bg);color:var(--code-fg);padding:14px 16px;border-radius:12px;margin:14px 0 0;overflow-x:auto}
.formula b{color:var(--amber)}
.checklist{list-style:none;padding:0;margin:14px 0 0;display:grid;gap:8px}
.checklist li{padding-left:28px;position:relative;color:var(--muted)}
.checklist li::before{content:"";position:absolute;left:2px;top:.55em;width:14px;height:8px;border-left:3px solid var(--ok);border-bottom:3px solid var(--ok);transform:rotate(-45deg) translateY(-50%)}
.checklist b{color:var(--fg)}

/* diagrams */
.diagram{background:var(--card);border:1px solid var(--line);border-radius:22px;padding:22px;box-shadow:var(--shadow)}
.diagram svg{display:block;width:100%;height:auto}
.diagram .v-only{display:none}
@media (max-width:760px){.diagram .h-only{display:none}.diagram .v-only{display:block;max-width:360px;margin:0 auto}}
.node{fill:var(--card);stroke:var(--line);stroke-width:1.5}
.node.hot{stroke:var(--amber);fill:color-mix(in srgb,var(--amber) 9%,var(--card))}
.node.vio{stroke:var(--violet);fill:color-mix(in srgb,var(--violet) 9%,var(--card))}
.dt{fill:var(--fg);font:800 15px var(--sans)}.ds{fill:var(--muted);font:500 12.5px var(--sans)}
.flow{stroke:var(--violet);stroke-width:3;fill:none;stroke-dasharray:6 8;animation:dash 1.1s linear infinite}
@keyframes dash{to{stroke-dashoffset:-28}}
.dot{fill:var(--amber);animation:run 2.4s linear infinite}
.dotv{animation-name:runv}
@keyframes run{from{transform:translateX(0);opacity:0}15%{opacity:1}85%{opacity:1}to{transform:translateX(var(--dx,35px));opacity:0}}
@keyframes runv{from{transform:translateY(0);opacity:0}15%{opacity:1}85%{opacity:1}to{transform:translateY(var(--dx,56px));opacity:0}}
.arrowhead{fill:var(--violet)}

/* arena svg */
.arena{--cyc:9s}
.arena .card-s{fill:var(--card);stroke:var(--line);stroke-width:1.5}
.arena .q{fill:var(--violet-t);font:900 44px var(--sans)}
.arena .lbl{fill:var(--muted);font:700 11px var(--sans);letter-spacing:.12em}
.arena .sm{fill:var(--muted);font:500 12.5px var(--sans)}
.arena .big{fill:var(--fg);font:800 15px var(--sans)}
.arena .vote{opacity:0;animation:vote var(--cyc) infinite}
.arena .vote.v2{animation-delay:.5s}.arena .vote.v3{animation-delay:1s}
@keyframes vote{0%,18%{opacity:0;transform:scale(.4)}26%{opacity:1;transform:scale(1)}92%{opacity:1}100%{opacity:0}}
.arena .hidden-t{animation:hid var(--cyc) infinite}
.arena .reveal-t{opacity:0;animation:rev var(--cyc) infinite}
@keyframes hid{0%,52%{opacity:1}56%,94%{opacity:0}98%,100%{opacity:1}}
@keyframes rev{0%,52%{opacity:0}58%,92%{opacity:1}97%,100%{opacity:0}}
.arena .verdict{opacity:0;animation:rev var(--cyc) infinite}
.arena .elo-a{transform-origin:left center;animation:eloA var(--cyc) infinite}
.arena .elo-b{transform-origin:left center;animation:eloB var(--cyc) infinite}
@keyframes eloA{0%,60%{transform:scaleX(1)}72%,92%{transform:scaleX(1.032)}100%{transform:scaleX(1)}}
@keyframes eloB{0%,60%{transform:scaleX(1)}72%,92%{transform:scaleX(.968)}100%{transform:scaleX(1)}}
.arena .n-old{animation:hid var(--cyc) infinite}.arena .n-new{opacity:0;animation:rev var(--cyc) infinite}
.arena .winner{opacity:0;animation:rev var(--cyc) infinite}
.eloA{fill:var(--amber)}.eloB{fill:var(--violet)}

/* code */
.codeblk{position:relative;margin:0 0 18px}
.codeblk .cap{font-size:.78rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin:0 0 8px}
pre{margin:0;background:var(--code-bg);color:var(--code-fg);border-radius:14px;padding:16px 18px;overflow-x:auto;font-size:.86rem;line-height:1.65;border:1px solid var(--line)}
pre code{background:none;padding:0;font-size:inherit;color:inherit}
pre .c{color:var(--code-mut)}
.copy{position:absolute;right:0;top:-7px;font:700 .72rem var(--sans);padding:5px 11px;border-radius:8px;border:1px solid #3a2f5c;background:#241a40;color:#e6dcfa;cursor:pointer;display:none}
.js .copy{display:block}
.copy:hover{background:#33265c}
.steps{counter-reset:s;display:grid;gap:26px 40px;grid-template-columns:repeat(2,minmax(0,1fr))}
@media (max-width:900px){.steps{grid-template-columns:1fr}}
.step>div{min-width:0}
.step{display:grid;grid-template-columns:44px minmax(0,1fr);gap:18px}
.step::before{counter-increment:s;content:counter(s);width:44px;height:44px;border-radius:14px;display:grid;place-items:center;font:900 1.15rem var(--mono);color:var(--ink-on-grad);background:linear-gradient(135deg,#ffb02e,#c084fc)}
.step h3{margin-top:6px}.step p{color:var(--muted);margin:0 0 12px}

/* faq */
.faq{display:grid;gap:12px;max-width:860px}
details{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:0 20px;transition:border-color .2s}
details[open]{border-color:color-mix(in srgb,var(--violet) 55%,var(--line))}
summary{cursor:pointer;font-weight:750;padding:18px 28px 18px 0;list-style:none;position:relative}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";position:absolute;right:0;top:50%;transform:translateY(-50%);font:700 1.5rem var(--mono);color:var(--amber-t);transition:transform .25s}
details[open] summary::after{transform:translateY(-50%) rotate(45deg)}
details p{margin:0 0 18px;color:var(--muted)}

/* more */
.more a.card{text-decoration:none;color:var(--fg);display:block}
.more a.card b{display:block;font-size:1.05rem;margin-bottom:4px}
.more a.card span{color:var(--muted);font-size:.9rem}
.more a.card::after{content:"\2197";position:absolute;right:18px;top:16px;color:var(--amber-t);font-weight:800}

/* footer */
footer{padding:48px 0 60px;border-top:1px solid var(--line);color:var(--muted);font-size:.9rem;background:var(--bg2)}
footer .cols{display:flex;flex-wrap:wrap;gap:28px 60px;justify-content:space-between}
footer ul{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:6px 22px}
footer p{margin:8px 0 0;max-width:52em}

/* reveal */
.js .rv{opacity:0;transform:translateY(22px);transition:opacity .7s ease,transform .7s cubic-bezier(.2,.8,.2,1);transition-delay:calc(var(--d,0)*90ms)}
.js .rv.in{opacity:1;transform:none}

/* 404 */
.nf{min-height:100vh;display:grid;place-items:center;text-align:center;padding:40px 0}
.nf .big{font:900 clamp(6rem,22vw,12rem)/1 var(--mono);margin:0;letter-spacing:-.06em}
.nf h1{font-size:clamp(1.8rem,4vw,2.6rem)}
.nf .lede{margin:0 auto}.nf .cta{justify-content:center}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
  .js .rv{opacity:1;transform:none}
  .dim .bar i{transform:scaleX(1)}
  .arena .vote{opacity:1}.arena .reveal-t,.arena .verdict,.arena .winner{opacity:1}.arena .hidden-t,.arena .n-old{opacity:0}.arena .n-new{opacity:1}
}

.arena .vote,.arena .elo-a,.arena .elo-b,.dot{transform-box:fill-box;transform-origin:center}
.arena .elo-a,.arena .elo-b{transform-origin:left center}