/* Helix site — one colour. Neutral greys, Helix mint used sparingly,
   monochrome primary actions, small calm motion. Shared by every page. */
:root{
  --font:'Inter',system-ui,-apple-system,'Segoe UI',sans-serif;
  --display:'Inter Tight','Inter',system-ui,sans-serif;
  --mono:'JetBrains Mono',ui-monospace,Consolas,monospace;
  --ease:cubic-bezier(.2,.8,.2,1);
  --wrap:1120px;
}
:root,[data-theme="dark"]{
  --bg:#0b0c0e;--surface:#111214;--surface2:#17181b;--surface3:#1d1f23;
  --border:#232529;--border-strong:#2e3136;
  --text:#ededef;--text2:#a0a1a8;--text3:#6c6d75;
  --accent:#3ecf9e;--accent-soft:rgba(62,207,158,.10);--accent-text:#04140e;
  --ink:#ededef;--ink-text:#0b0c0e;--ink-hover:#fff;
  --code:#0e0f11;--grid:rgba(255,255,255,.035);
  --shadow:0 24px 60px rgba(0,0,0,.5);
  color-scheme:dark;
}
[data-theme="light"]{
  --bg:#fbfbfa;--surface:#ffffff;--surface2:#f4f4f2;--surface3:#ececea;
  --border:#e8e8e5;--border-strong:#d8d8d4;
  --text:#111113;--text2:#5d5e66;--text3:#8f9097;
  --accent:#0a8f6c;--accent-soft:rgba(10,143,108,.08);--accent-text:#fff;
  --ink:#111113;--ink-text:#fff;--ink-hover:#000;
  --code:#f4f4f2;--grid:rgba(17,17,19,.045);
  --shadow:0 24px 60px rgba(17,17,19,.10);
  color-scheme:light;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:76px}
body{margin:0;background:var(--bg);color:var(--text);font:400 16px/1.6 var(--font);
  -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility;
  transition:background-color .3s ease,color .3s ease}
a{color:inherit;text-decoration:none}
img,svg{display:block}
::selection{background:var(--accent-soft)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:6px}
.wrap{width:min(var(--wrap),100%);margin:0 auto;padding:0 24px}
.mono{font-family:var(--mono)}
.muted{color:var(--text2)}
.accent{color:var(--accent)}

/* ── nav ─────────────────────────────────────────────────────────── */
.nav{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--bg) 80%,transparent);
  backdrop-filter:saturate(1.6) blur(12px);-webkit-backdrop-filter:saturate(1.6) blur(12px);
  border-bottom:1px solid transparent;transition:border-color .25s ease}
.scrolled .nav{border-bottom-color:var(--border)}
.nav .wrap{display:flex;align-items:center;height:60px;gap:18px}
.brand{display:flex;align-items:center;gap:10px;font:600 17px/1 var(--display);letter-spacing:-.02em}
.mark{width:26px;height:26px;border-radius:7px;background:var(--accent);display:grid;place-items:center;flex:none}
.mark svg{width:15px;height:15px}
.mark path{stroke:var(--accent-text)}
.links{display:flex;gap:2px;margin-left:14px}
.links a{position:relative;padding:7px 11px;border-radius:8px;color:var(--text2);font-size:14px;transition:color .18s ease}
.links a:hover,.links a[aria-current="page"]{color:var(--text)}
.links a[aria-current="page"]::after{content:"";position:absolute;left:11px;right:11px;bottom:-11px;height:1.5px;background:var(--text);border-radius:2px}
.nav-r{margin-left:auto;display:flex;align-items:center;gap:8px}
.icon-btn{width:36px;height:36px;border-radius:9px;display:grid;place-items:center;background:transparent;border:1px solid transparent;
  color:var(--text2);cursor:pointer;transition:background-color .18s ease,color .18s ease,border-color .18s ease}
.icon-btn:hover{background:var(--surface2);color:var(--text);border-color:var(--border)}
.icon-btn svg{width:17px;height:17px;stroke:currentColor;fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.t-sun{display:none}[data-theme="light"] .t-sun{display:block}[data-theme="light"] .t-moon{display:none}
.menu-btn{display:none}
.drawer{display:none}

/* ── buttons ─────────────────────────────────────────────────────── */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:44px;padding:0 20px;border-radius:10px;
  font:500 15px/1 var(--font);letter-spacing:-.01em;cursor:pointer;border:1px solid transparent;white-space:nowrap;
  transition:background-color .2s ease,border-color .2s ease,color .2s ease,transform .15s ease}
.btn:active{transform:scale(.98)}
.btn.pri{background:var(--ink);color:var(--ink-text)}
.btn.pri:hover{background:var(--ink-hover)}
.btn.sec{background:transparent;color:var(--text);border-color:var(--border-strong)}
.btn.sec:hover{background:var(--surface2);border-color:var(--text3)}
.btn.sm{height:36px;padding:0 14px;font-size:14px;border-radius:9px}
.btn .arr{width:14px;height:14px;transition:transform .2s var(--ease)}
.btn:hover .arr{transform:translateX(3px)}
.btn svg path{stroke:currentColor}
.link{color:var(--accent);font-weight:500;display:inline-flex;align-items:center;gap:6px}
.link .arr{width:13px;height:13px;transition:transform .2s var(--ease)}
.link:hover .arr{transform:translateX(3px)}

/* ── hero ────────────────────────────────────────────────────────── */
.hero{position:relative;padding:96px 0 40px;text-align:center;overflow:hidden}
.hero.page{padding:88px 0 24px}
.grid-bg{position:absolute;inset:0 0 auto 0;height:720px;pointer-events:none;
  background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);
  background-size:56px 56px;background-position:center -1px;
  -webkit-mask-image:radial-gradient(ellipse 70% 60% at 50% 0%,#000 30%,transparent 75%);
  mask-image:radial-gradient(ellipse 70% 60% at 50% 0%,#000 30%,transparent 75%)}
.hero>.wrap{position:relative}
.pill{display:inline-flex;align-items:center;gap:8px;padding:5px 12px 5px 6px;border-radius:999px;font-size:13px;color:var(--text2);
  border:1px solid var(--border);background:var(--surface);transition:border-color .2s ease}
a.pill:hover{border-color:var(--border-strong);color:var(--text)}
.pill b{padding:2px 8px;border-radius:999px;background:var(--accent-soft);color:var(--accent);font-size:11px;font-weight:600}
h1,.h1{font:600 clamp(40px,6.4vw,74px)/1.05 var(--display);letter-spacing:-.025em;margin:22px auto 0;max-width:15ch}
.hero.page h1{font-size:clamp(36px,5.2vw,60px);max-width:18ch}
h1 em,.h2 em{font-style:normal;color:var(--accent)}
.lede{max-width:600px;margin:20px auto 0;font-size:clamp(16px,1.5vw,18.5px);line-height:1.6;color:var(--text2)}
.cta{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:32px}
.fine{margin-top:16px;font-size:13px;color:var(--text3)}

/* ── the live run card (home hero) ───────────────────────────────── */
.run{max-width:760px;margin:60px auto 0;text-align:left;border:1px solid var(--border);border-radius:16px;background:var(--surface);
  box-shadow:var(--shadow);overflow:hidden}
.run-top{display:flex;align-items:center;gap:10px;padding:14px 18px;border-bottom:1px solid var(--border)}
.run-top .dot{width:8px;height:8px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 0 var(--accent-soft);animation:ping 2s ease-out infinite}
@keyframes ping{0%{box-shadow:0 0 0 0 rgba(62,207,158,.35)}100%{box-shadow:0 0 0 8px transparent}}
.run-top .goal{font-weight:500;font-size:14.5px;flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.run-top .goal .caret{display:inline-block;width:7px;height:1em;vertical-align:-2px;margin-left:2px;background:var(--text);animation:blink 1s steps(2) infinite}
@keyframes blink{50%{opacity:0}}
.run-top .time{font:12.5px var(--mono);color:var(--text3)}
.steps{list-style:none;margin:0;padding:10px 0}
.step{display:flex;align-items:flex-start;gap:12px;padding:9px 18px;opacity:.28;transition:opacity .35s ease}
.step.on,.step.done{opacity:1}
.step .ic{flex:none;width:20px;height:20px;margin-top:1px;border-radius:50%;border:1.5px solid var(--border-strong);display:grid;place-items:center;
  transition:border-color .3s ease,background-color .3s ease}
.step.on .ic{border-color:var(--text2);border-top-color:transparent;animation:spin .8s linear infinite}
.step.done .ic{border-color:var(--accent);background:var(--accent)}
.step .ic svg{width:11px;height:11px;opacity:0;transform:scale(.6);transition:opacity .25s ease,transform .25s var(--ease)}
.step.done .ic svg{opacity:1;transform:none}
.step .ic svg path{stroke:var(--accent-text)}
@keyframes spin{to{transform:rotate(360deg)}}
.step .tx{flex:1;min-width:0;font-size:14.5px}
.step .tx small{display:block;color:var(--text3);font-size:12.5px;margin-top:2px}
.step .ms{font:12px var(--mono);color:var(--text3);white-space:nowrap}
.run-foot{display:flex;align-items:center;gap:10px;padding:13px 18px;border-top:1px solid var(--border);font-size:13.5px;color:var(--text2);
  min-height:48px}
.run-foot .ok{color:var(--accent);font-weight:500;opacity:0;transform:translateY(4px);transition:opacity .4s ease,transform .4s var(--ease)}
.run.finished .run-foot .ok{opacity:1;transform:none}

/* ── logos / apps strip ──────────────────────────────────────────── */
.strip{padding:56px 0 0;text-align:center}
.strip p{font-size:13px;color:var(--text3);margin:0 0 18px}
.marquee{position:relative;overflow:hidden;-webkit-mask-image:linear-gradient(90deg,transparent,#000 12%,#000 88%,transparent);
  mask-image:linear-gradient(90deg,transparent,#000 12%,#000 88%,transparent)}
.marquee .row{display:flex;gap:12px;width:max-content;animation:slide 40s linear infinite}
.marquee:hover .row{animation-play-state:paused}
.tag{padding:8px 14px;border-radius:999px;border:1px solid var(--border);background:var(--surface);font-size:13.5px;color:var(--text2);white-space:nowrap}
@keyframes slide{to{transform:translateX(-50%)}}

/* ── sections ────────────────────────────────────────────────────── */
section.sec{padding:120px 0 0}
.kicker{font-size:13px;font-weight:500;color:var(--accent)}
.h2{font:600 clamp(30px,3.8vw,44px)/1.1 var(--display);letter-spacing:-.02em;margin:10px 0 0;max-width:20ch}
.sub{color:var(--text2);font-size:17px;line-height:1.6;max-width:600px;margin:14px 0 0}
.center{text-align:center}.center .h2,.center .sub{margin-left:auto;margin-right:auto}
.head-row{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;flex-wrap:wrap}

/* stat cards */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;margin-top:44px;background:var(--border);border:1px solid var(--border);
  border-radius:14px;overflow:hidden}
.stat{background:var(--surface);padding:26px 24px}
.stat .n{font:600 40px/1 var(--display);letter-spacing:-.03em}
.stat .n small{font-size:18px;color:var(--text2);font-weight:500;margin-left:2px}
.stat .l{margin-top:12px;font-size:14.5px}
.stat .w{margin-top:4px;font-size:12.5px;color:var(--text3)}

/* feature grid */
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;margin-top:44px;background:var(--border);border:1px solid var(--border);
  border-radius:14px;overflow:hidden}
.grid2{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-top:44px}
.cell{background:var(--surface);padding:28px;transition:background-color .25s ease}
.cell:hover{background:var(--surface2)}
.ico{width:38px;height:38px;border-radius:10px;display:grid;place-items:center;background:var(--surface2);border:1px solid var(--border);
  transition:border-color .25s ease,background-color .25s ease}
.ico svg{width:18px;height:18px;stroke:var(--text2);fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;transition:stroke .25s ease}
.cell:hover .ico,.card:hover .ico{border-color:var(--border-strong);background:var(--surface)}
.cell:hover .ico svg,.card:hover .ico svg{stroke:var(--accent)}
.cell h3,.card h3{font:600 17px/1.3 var(--display);letter-spacing:-.015em;margin:18px 0 6px}
.cell p,.card p{color:var(--text2);font-size:14.5px;line-height:1.6;margin:0}
.card{border:1px solid var(--border);border-radius:14px;background:var(--surface);padding:28px;transition:border-color .25s ease,transform .25s var(--ease)}
.card:hover{border-color:var(--border-strong)}

/* split feature rows */
.split{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center;margin-top:72px}
.split.rev .split-t{order:2}
.split-t h3{font:600 clamp(24px,2.6vw,30px)/1.15 var(--display);letter-spacing:-.02em;margin:10px 0 0}
.split-t p{color:var(--text2);margin:14px 0 0;line-height:1.65}
.checks{list-style:none;padding:0;margin:20px 0 0;display:grid;gap:10px}
.checks li{display:flex;gap:11px;font-size:14.5px;color:var(--text2)}
.checks li::before{content:"";flex:0 0 16px;height:16px;margin-top:3px;border-radius:50%;background:var(--accent-soft);
  -webkit-mask:none;box-shadow:inset 0 0 0 1px color-mix(in srgb,var(--accent) 35%,transparent)}
.checks li{position:relative}
.checks li::after{content:"";position:absolute;left:5px;top:7px;width:6px;height:3.5px;border-left:1.6px solid var(--accent);
  border-bottom:1.6px solid var(--accent);transform:rotate(-45deg)}
.panel{border:1px solid var(--border);border-radius:16px;background:var(--surface);overflow:hidden;box-shadow:var(--shadow)}
.panel-top{display:flex;align-items:center;gap:6px;padding:12px 16px;border-bottom:1px solid var(--border)}
.panel-top i{width:9px;height:9px;border-radius:50%;background:var(--surface3)}
.panel-top span{margin-left:8px;font-size:12px;color:var(--text3)}
.term{padding:18px 20px;background:var(--code);font:13px/1.85 var(--mono);color:var(--text2);overflow:hidden}
.term .p{color:var(--text3)}.term .ok{color:var(--accent)}.term .k{color:var(--text)}
.term .line{opacity:0;transform:translateY(4px);transition:opacity .35s ease,transform .35s var(--ease)}
.term.play .line{opacity:1;transform:none}

/* diff panel (code page) */
.diff{font:12.5px/1.75 var(--mono);background:var(--code);padding:14px 0}
.diff div{padding:0 18px;white-space:pre;overflow:hidden;text-overflow:ellipsis}
.diff .add{background:color-mix(in srgb,var(--accent) 10%,transparent);color:var(--text)}
.diff .del{background:rgba(255,90,90,.07);color:var(--text3);text-decoration:line-through;text-decoration-color:rgba(255,90,90,.4)}
.diff .hunk{color:var(--text3)}

/* steps */
.flow{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:44px;counter-reset:f}
.flow .card{counter-increment:f}
.flow .card::before{content:counter(f,decimal-leading-zero);display:inline-block;font:500 12.5px/1 var(--mono);color:var(--text3);
  padding:5px 8px;border:1px solid var(--border);border-radius:6px}

/* tables */
.table{margin-top:40px;border:1px solid var(--border);border-radius:14px;overflow:hidden;background:var(--surface)}
.table table{width:100%;border-collapse:collapse;font-size:14.5px}
.table th,.table td{text-align:left;padding:15px 20px;border-bottom:1px solid var(--border);vertical-align:top}
.table tr:last-child td{border-bottom:0}
.table th{font-weight:500;color:var(--text3);font-size:13px;background:var(--surface2)}
.table td:first-child{color:var(--text);font-weight:500;width:28%}
.table td{color:var(--text2)}
.table td.us{color:var(--text)}
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}

/* bars (benchmarks) */
.bars{display:grid;gap:18px;margin-top:22px}
.bar .bl{display:flex;justify-content:space-between;font-size:13.5px;color:var(--text2);margin-bottom:7px}
.bar .bl b{color:var(--text);font-weight:500}
.track{height:8px;border-radius:999px;background:var(--surface3);overflow:hidden}
.fill{height:100%;width:0;border-radius:999px;background:var(--text3);transition:width 1.1s var(--ease)}
.fill.now{background:var(--accent)}
.in .fill{width:var(--w)}

/* faq */
.faq{margin-top:36px;max-width:820px;border-top:1px solid var(--border)}
.faq details{border-bottom:1px solid var(--border)}
.faq summary{cursor:pointer;list-style:none;padding:20px 0;font-weight:500;font-size:16px;display:flex;align-items:center;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"";margin-left:auto;width:9px;height:9px;border-right:1.5px solid var(--text3);border-bottom:1.5px solid var(--text3);
  transform:rotate(45deg) translate(-2px,-2px);transition:transform .25s var(--ease)}
.faq details[open] summary::after{transform:rotate(225deg) translate(-2px,-2px)}
.faq p{margin:0 0 20px;color:var(--text2);line-height:1.65;font-size:15px;max-width:680px}

/* changelog */
.rel{display:grid;grid-template-columns:200px 1fr;gap:32px;padding:40px 0;border-top:1px solid var(--border)}
.rel:first-of-type{border-top:0}
.rel .v{position:sticky;top:84px;align-self:start}
.rel .v b{display:block;font:600 22px/1 var(--display);letter-spacing:-.02em}
.rel .v span{display:block;margin-top:8px;font-size:13px;color:var(--text3)}
.rel .v .now{display:inline-block;margin-top:10px;padding:2px 8px;border-radius:999px;background:var(--accent-soft);color:var(--accent);font-size:11.5px;font-weight:600}
.rel ul{margin:0;padding:0;list-style:none;display:grid;gap:14px}
.rel li{color:var(--text2);line-height:1.65;padding-left:18px;position:relative}
.rel li::before{content:"";position:absolute;left:0;top:.7em;width:6px;height:6px;border-radius:50%;background:var(--border-strong)}
.rel li strong{color:var(--text);font-weight:600}

/* final cta + footer */
.final{margin:120px 0 0;text-align:center;padding:76px 24px;border-radius:20px;border:1px solid var(--border);background:var(--surface);position:relative;overflow:hidden}
.final .h2{margin:0 auto;max-width:18ch}
.final .sub{margin:14px auto 0}
.final .cta{margin-top:28px}
footer{margin-top:96px;border-top:1px solid var(--border);padding:48px 0 calc(40px + env(safe-area-inset-bottom));font-size:14px;color:var(--text3)}
.fgrid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:32px}
.fgrid h4{margin:0 0 12px;font-size:13px;font-weight:500;color:var(--text)}
.fgrid a{display:block;padding:4px 0;color:var(--text3);transition:color .18s ease}
.fgrid a:hover{color:var(--text)}
.fgrid p{margin:12px 0 0;max-width:260px;line-height:1.6}
.fbase{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;margin-top:40px;padding-top:24px;border-top:1px solid var(--border);font-size:13px}

/* reveal */
.js .rv{opacity:0;transform:translateY(14px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.js .rv.in{opacity:1;transform:none}
.js .rv.d1{transition-delay:.06s}.js .rv.d2{transition-delay:.12s}.js .rv.d3{transition-delay:.18s}
.hero .rise{animation:rise .7s var(--ease) both}
.hero .rise.d1{animation-delay:.05s}.hero .rise.d2{animation-delay:.1s}.hero .rise.d3{animation-delay:.15s}.hero .rise.d4{animation-delay:.22s}
@keyframes rise{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

/* DNA mark */
.dna-tile{width:60px;height:60px;margin:0 auto;border-radius:16px;border:1px solid var(--border-strong);background:var(--surface);display:grid;place-items:center}
.dna{display:flex;flex-direction:column;gap:1px}
.dna i{--i:0;position:relative;display:block;width:26px;height:4px}
.dna i::before{content:"";position:absolute;left:3px;right:3px;top:1.5px;height:1px;background:var(--accent);opacity:.3;
  animation:rung 2.8s ease-in-out infinite;animation-delay:calc(var(--i) * -.28s)}
.dna b{position:absolute;top:0;left:50%;width:4px;height:4px;margin-left:-2px;border-radius:50%;background:var(--accent);
  animation:sa 2.8s ease-in-out infinite;animation-delay:calc(var(--i) * -.28s)}
.dna b:last-child{animation-name:sb}
@keyframes sa{0%,100%{transform:translateX(-11px) scale(.7);opacity:.45}50%{transform:translateX(11px) scale(1.1);opacity:1}}
@keyframes sb{0%,100%{transform:translateX(11px) scale(1.1);opacity:1}50%{transform:translateX(-11px) scale(.7);opacity:.45}}
@keyframes rung{0%,50%,100%{transform:scaleX(1)}25%,75%{transform:scaleX(.08)}}

/* ── responsive ──────────────────────────────────────────────────── */
@media (max-width:960px){
  .links,.nav-r .btn.sm.hide-m{display:none}
  .menu-btn{display:grid}
  .drawer{display:block;position:fixed;inset:60px 0 auto 0;z-index:49;background:var(--bg);border-bottom:1px solid var(--border);
    padding:8px 16px 18px;transform:translateY(-8px);opacity:0;pointer-events:none;transition:opacity .2s ease,transform .25s var(--ease)}
  .menu-open .drawer{opacity:1;transform:none;pointer-events:auto}
  .drawer a{display:block;padding:13px 6px;border-bottom:1px solid var(--border);font-size:16px}
  .drawer a[aria-current="page"]{color:var(--accent)}
  .drawer .btn{margin-top:16px;width:100%}
  .stats{grid-template-columns:1fr 1fr}
  .grid3{grid-template-columns:1fr 1fr}
  .flow{grid-template-columns:1fr 1fr}
  .split{grid-template-columns:1fr;gap:28px;margin-top:56px}
  .split.rev .split-t{order:0}
  .fgrid{grid-template-columns:1fr 1fr}
}
@media (max-width:600px){
  .wrap{padding:0 16px}
  .nav .wrap{height:56px}
  .drawer{top:56px}
  .hero{padding:56px 0 24px}
  .hero.page{padding:52px 0 8px}
  .cta .btn{width:100%}
  .run{margin-top:40px;border-radius:14px}
  .step{padding:8px 14px}.run-top,.run-foot{padding-left:14px;padding-right:14px}
  .step .ms{display:none}
  .stats,.grid3,.grid2,.flow{grid-template-columns:1fr}
  section.sec{padding-top:88px}
  .final{margin-top:88px;padding:52px 18px}
  .rel{grid-template-columns:1fr;gap:14px;padding:32px 0}
  .rel .v{position:static}
  .fgrid{grid-template-columns:1fr 1fr;gap:24px}
  .fgrid>div:first-child{grid-column:1/-1}
  .table th,.table td{padding:12px 14px}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
  .js .rv{opacity:1;transform:none}
  .step{opacity:1}.in .fill{width:var(--w)}
}

/* sizes for inline arrows anywhere, and the footer brand row */
.arr{width:13px;height:13px;flex:none}
.arr path{stroke:currentColor}
.pill{white-space:nowrap;max-width:100%}
.pill .arr{color:var(--text3);transition:transform .2s var(--ease)}
a.pill:hover .arr{transform:translateX(2px)}
.fgrid a.brand{display:flex;padding:0;color:var(--text)}
@media (max-width:600px){.pill{white-space:normal;text-align:left}}

/* new Helix logo (Oct 2026) */
.mark{background:none !important;width:28px;height:28px;border-radius:0}.mark img{width:28px;height:28px;display:block;object-fit:contain}
.dna-tile.logo{width:96px;height:96px;border:0;background:none;filter:drop-shadow(0 18px 40px rgba(232,98,42,.35));animation:hxFloat 6s ease-in-out infinite}
.dna-tile.logo img{width:96px;height:96px;display:block;object-fit:contain}
@keyframes hxFloat{0%,100%{transform:translateY(0) rotate(0)}50%{transform:translateY(-6px) rotate(-2deg)}}
@media (prefers-reduced-motion:reduce){.dna-tile.logo{animation:none}}

/* ═══ Helix v3 — warm paper & warm black, one orange (matches the Helix logo) ═══ */
:root,[data-theme="dark"]{
  --bg:#0d0c0b;--surface:#141210;--surface2:#1a1714;--surface3:#221e1a;
  --border:#2a2520;--border-strong:#3a332c;
  --text:#f2ede6;--text2:#b4aca2;--text3:#7f776e;
  --accent:#f0692b;--accent-soft:rgba(240,105,43,.13);--accent-text:#fff;
  --ink:#f2ede6;--ink-text:#0d0c0b;--ink-hover:#fff;
  --code:#100f0d;--grid:rgba(255,236,214,.028);
  --shadow:0 24px 60px rgba(0,0,0,.55);
  --saturn-o:.42;
}
[data-theme="light"]{
  --bg:#f6f1ea;--surface:#fffdf9;--surface2:#f1eae0;--surface3:#e9e0d3;
  --border:#e6ddd0;--border-strong:#d7cbba;
  --text:#1b1815;--text2:#5f564c;--text3:#8f8478;
  --accent:#c4501b;--accent-soft:rgba(196,80,27,.09);--accent-text:#fff;
  --ink:#1b1815;--ink-text:#fffdf9;--ink-hover:#000;
  --code:#f1eae0;--grid:rgba(60,40,20,.04);
  --shadow:0 24px 60px rgba(60,40,20,.10);
  --saturn-o:.26;
}
@keyframes ping{0%{box-shadow:0 0 0 0 rgba(240,105,43,.4)}100%{box-shadow:0 0 0 8px transparent}}
/* paper grain over everything, very faint */
body::before{content:"";position:fixed;inset:0;z-index:0;pointer-events:none;opacity:.5;mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .5 0 0 0 0 .45 0 0 0 0 .4 0 0 0 .22 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E")}
[data-theme="light"] body::before{mix-blend-mode:multiply;opacity:.35}
body>*{position:relative;z-index:1}
.nav{z-index:50}
/* fewer lines: the grid goes, a few quiet stars stay */
.grid-bg{display:none}
.hero{isolation:isolate}
.hero::before{content:"";position:absolute;inset:0;z-index:-1;pointer-events:none;opacity:.55;
  background-image:radial-gradient(1.4px 1.4px at 12% 22%,var(--text3) 50%,transparent 52%),radial-gradient(1.2px 1.2px at 28% 68%,var(--text3) 50%,transparent 52%),
    radial-gradient(1.6px 1.6px at 46% 12%,var(--accent) 50%,transparent 52%),radial-gradient(1.2px 1.2px at 8% 84%,var(--text3) 50%,transparent 52%),
    radial-gradient(1.4px 1.4px at 88% 76%,var(--accent) 50%,transparent 52%),radial-gradient(1.1px 1.1px at 64% 88%,var(--text3) 50%,transparent 52%)}
/* the ringed planet: home hero only, top right, low opacity, never under the headline on small screens */
.hero:not(.page)::after{content:"";position:absolute;z-index:-1;pointer-events:none;top:-120px;right:-400px;width:1020px;aspect-ratio:1600/593;
  background:url(saturn.webp) center/contain no-repeat;opacity:var(--saturn-o);transform:rotate(-8deg);
  -webkit-mask-image:radial-gradient(closest-side,#000 62%,transparent 100%);mask-image:radial-gradient(closest-side,#000 62%,transparent 100%);
  animation:hxDrift 22s ease-in-out infinite}
.hero.page::after{content:"";position:absolute;z-index:-1;pointer-events:none;top:-30px;right:-300px;width:640px;aspect-ratio:1600/593;
  background:url(saturn-sm.webp) center/contain no-repeat;opacity:calc(var(--saturn-o) * .55);transform:rotate(-8deg)}
@keyframes hxDrift{0%,100%{transform:rotate(-8deg) translateY(0)}50%{transform:rotate(-6deg) translateY(10px)}}
@media (max-width:900px){.hero:not(.page)::after{width:620px;right:-300px;top:-20px;opacity:calc(var(--saturn-o) * .7)}.hero.page::after{display:none}}
@media (prefers-reduced-motion:reduce){.hero:not(.page)::after{animation:none}}
/* primary actions take the orange */
.btn.pri{background:var(--accent);color:var(--accent-text);box-shadow:0 10px 30px -12px rgba(240,105,43,.6)}
.btn.pri:hover{background:var(--accent);filter:brightness(1.08)}
/* headline accent and serif display, like the Helix app */
.hero h1{font-family:'Newsreader',Georgia,serif;font-weight:400;letter-spacing:-.02em}
.hero h1 em,.hero h1 .accent{font-style:normal;color:var(--accent)}