/* Ocho design system. One family, Apple-grade neutrals, one accent, one motif (the eight). */
:root{
  --white:#ffffff; --ink:#1d1d1f; --ink-2:#6e6e73; --ground:#f5f5f7; --line:#d2d2d7;
  --black:#000000; --accent:#2d5bff; --accent-ink:#1a3fd6; --ok:#1f9d55;
  --font:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text","Inter","Helvetica Neue",Helvetica,Arial,sans-serif;
  --max:980px; --wide:1200px; --nav:48px; --r:18px; --r-sm:12px;
}
*{box-sizing:border-box} html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto} *,*::before,*::after{animation-duration:.001ms!important;transition-duration:.001ms!important}}
body{margin:0;background:var(--white);color:var(--ink);font-family:var(--font);font-size:17px;line-height:1.47;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:var(--accent);text-decoration:none} a:hover{text-decoration:underline}
img{max-width:100%;height:auto;display:block}
h1,h2,h3,h4{margin:0;font-weight:600;letter-spacing:-.015em;line-height:1.08}
h1{font-size:clamp(40px,7vw,80px);font-weight:700;letter-spacing:-.03em}
h2{font-size:clamp(32px,4.6vw,56px);letter-spacing:-.025em}
h3{font-size:clamp(22px,2.4vw,28px)} h4{font-size:19px}
p{margin:0}
.lede{font-size:clamp(19px,2.2vw,28px);line-height:1.3;color:var(--ink-2);font-weight:400;letter-spacing:-.01em}
.small{font-size:14px;color:var(--ink-2);line-height:1.45}
:focus-visible{outline:3px solid var(--accent);outline-offset:3px;border-radius:6px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* nav */
.nav{position:sticky;top:0;z-index:50;height:var(--nav);background:rgba(255,255,255,.72);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid rgba(0,0,0,.08)}
.nav-in{max-width:var(--max);margin:0 auto;height:100%;display:flex;align-items:center;justify-content:space-between;padding:0 22px}
.nav-mark{display:flex;align-items:center;gap:10px;color:var(--ink);font-weight:600;font-size:15px}
.nav-mark img{height:22px;width:auto}
.nav-links{display:flex;gap:28px;align-items:center;list-style:none;margin:0;padding:0}
.nav-links a{color:var(--ink);font-size:14px;opacity:.85} .nav-links a:hover{opacity:1;text-decoration:none}
.nav.dark{background:rgba(0,0,0,.72);border-bottom-color:rgba(255,255,255,.12)} .nav.dark .nav-mark,.nav.dark .nav-links a{color:#f5f5f7}
@media (max-width:760px){.nav-links li.hide-m{display:none}}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:44px;padding:0 22px;border-radius:980px;font:inherit;font-size:16px;font-weight:500;border:1px solid transparent;cursor:pointer;transition:background .15s,color .15s,border-color .15s,transform .15s;white-space:nowrap}
.btn:hover{text-decoration:none}
.btn-primary{background:var(--accent);color:#fff} .btn-primary:hover{background:var(--accent-ink)}
.btn-ink{background:var(--ink);color:#fff} .btn-ink:hover{background:#000}
.btn-ghost{background:transparent;color:var(--accent);border-color:var(--accent)} .btn-ghost:hover{background:var(--accent);color:#fff}
.btn-light{background:#fff;color:var(--ink);border-color:var(--line)} .btn-light:hover{border-color:var(--ink)}
.btn:active{transform:scale(.985)}
.btn-lg{height:52px;padding:0 30px;font-size:17px}
.link{font-weight:500} .link::after{content:" \203A";font-weight:600}

/* sections */
.section{padding:clamp(72px,10vw,140px) 22px}
.section.tight{padding-top:clamp(48px,6vw,80px);padding-bottom:clamp(48px,6vw,80px)}
.section.ground{background:var(--ground)} .section.black{background:var(--black);color:#f5f5f7}
.section.black .lede,.section.black .small{color:#a1a1a6}
.wrap{max-width:var(--max);margin:0 auto} .wrap-wide{max-width:var(--wide);margin:0 auto}
.center{text-align:center} .stack{display:flex;flex-direction:column;gap:18px}
.eyebrow-less{margin-bottom:14px}
.grid{display:grid;gap:18px}
.grid-2{grid-template-columns:repeat(2,1fr)} .grid-3{grid-template-columns:repeat(3,1fr)} .grid-4{grid-template-columns:repeat(4,1fr)}
@media (max-width:900px){.grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}}
@media (max-width:600px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}}

/* tiles: Apple grey tiles, radius by hierarchy (28 hero tile, 18 standard, 12 inner) */
.tile{background:var(--ground);border-radius:var(--r);padding:34px 30px;display:flex;flex-direction:column;gap:10px;min-height:220px}
.tile.white{background:#fff;border:1px solid var(--line)}
.tile.dark{background:#000;color:#f5f5f7} .tile.dark .small{color:#a1a1a6}
.tile.span-2{grid-column:span 2} @media (max-width:600px){.tile.span-2{grid-column:span 1}}
.tile h3{margin-bottom:4px} .tile .n{font-size:15px;font-weight:600;color:var(--ink-2);letter-spacing:.01em}
.tile.dark .n{color:#86868b}
.tile .foot{margin-top:auto;padding-top:12px}

/* hero */
.hero{padding:clamp(72px,11vw,150px) 22px clamp(56px,8vw,100px);text-align:center}
.hero .lede{max-width:720px;margin:22px auto 0}
.hero .cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-top:34px}
.hero-mark{width:min(320px,60vw);margin:0 auto 34px}

/* the eight: figure-eight motif */
.eight{width:min(760px,92vw);margin:0 auto;display:block}
.eight path.loop{fill:none;stroke:var(--ink);stroke-width:2.5;stroke-linecap:round;stroke-dasharray:2400;stroke-dashoffset:2400;animation:draw 2.4s cubic-bezier(.65,0,.35,1) .2s forwards}
.eight path.pulse{fill:none;stroke:var(--accent);stroke-width:5;stroke-linecap:round;stroke-dasharray:60 2400;stroke-dashoffset:2400;animation:travel 3.6s linear 2.4s infinite}
.eight text{font-family:var(--font);font-size:15px;font-weight:500;fill:var(--ink);opacity:0;animation:appear .6s ease forwards}
.eight text:nth-of-type(1){animation-delay:.6s}.eight text:nth-of-type(2){animation-delay:.9s}.eight text:nth-of-type(3){animation-delay:1.2s}.eight text:nth-of-type(4){animation-delay:1.5s}.eight text:nth-of-type(5){animation-delay:1.8s}.eight text:nth-of-type(6){animation-delay:2.1s}.eight text:nth-of-type(7){animation-delay:2.4s}.eight text:nth-of-type(8){animation-delay:2.7s}
@keyframes draw{to{stroke-dashoffset:0}} @keyframes travel{to{stroke-dashoffset:0}} @keyframes appear{to{opacity:1}}
@media (prefers-reduced-motion:reduce){.eight path.loop{stroke-dashoffset:0;animation:none}.eight path.pulse{display:none}.eight text{opacity:1;animation:none}}
.section.black .eight path.loop{stroke:#f5f5f7} .section.black .eight text{fill:#f5f5f7}

/* jobs list */
.jobs{display:grid;grid-template-columns:repeat(4,1fr);gap:14px 18px;counter-reset:job}
@media (max-width:900px){.jobs{grid-template-columns:repeat(2,1fr)}} @media (max-width:520px){.jobs{grid-template-columns:1fr}}
.job{padding:22px 0 18px;border-top:1px solid var(--line);counter-increment:job}
.job::before{content:counter(job);display:block;font-size:40px;font-weight:700;letter-spacing:-.04em;line-height:1;margin-bottom:10px;color:var(--ink)}
.job h4{margin-bottom:6px} .job p{color:var(--ink-2);font-size:15px;line-height:1.45}
.section.black .job{border-top-color:#333336} .section.black .job::before,.section.black .job h4{color:#f5f5f7} .section.black .job p{color:#a1a1a6}

/* forms */
.field{display:flex;flex-direction:column;gap:6px} .field label{font-size:14px;font-weight:500}
.input,select.input,textarea.input{font:inherit;font-size:16px;height:46px;padding:0 14px;border:1px solid var(--line);border-radius:var(--r-sm);background:#fff;color:var(--ink);width:100%}
textarea.input{height:auto;min-height:120px;padding:12px 14px;resize:vertical}
.input:focus{border-color:var(--accent);outline:none;box-shadow:0 0 0 4px rgba(45,91,255,.15)}
.row{display:flex;gap:12px;flex-wrap:wrap} .row>*{flex:1 1 220px}
.hint{font-size:13px;color:var(--ink-2)}
.notice{border-radius:var(--r-sm);padding:12px 14px;font-size:15px;background:var(--ground)}
.notice.ok{background:#e9f7ee;color:#0f5a30} .notice.err{background:#fdecec;color:#8a1c1c}

/* pulse tool */
.pulse-q{padding:22px 0;border-top:1px solid var(--line)} .pulse-q:first-of-type{border-top:0}
.pulse-q legend{font-weight:600;font-size:18px;margin-bottom:12px;padding:0}
.scale{display:flex;gap:8px;flex-wrap:wrap}
.scale label{flex:1 1 90px;text-align:center;border:1px solid var(--line);border-radius:12px;padding:12px 8px;cursor:pointer;font-size:14px;line-height:1.3;background:#fff}
.scale input{position:absolute;opacity:0;pointer-events:none}
.scale input:checked+span{color:#fff} .scale label:has(input:checked){background:var(--ink);border-color:var(--ink);color:#fff}
.scale label:has(input:focus-visible){outline:3px solid var(--accent);outline-offset:2px}
.bars{display:flex;flex-direction:column;gap:12px}
.bar{display:grid;grid-template-columns:150px 1fr 48px;align-items:center;gap:12px;font-size:15px}
.bar .track{height:10px;background:#e8e8ed;border-radius:6px;overflow:hidden} .bar .fill{height:100%;background:var(--ink);border-radius:6px;transition:width .6s ease}
.bar.weak .fill{background:var(--accent)} .bar .v{text-align:right;font-variant-numeric:tabular-nums;color:var(--ink-2)}
@media (max-width:520px){.bar{grid-template-columns:110px 1fr 40px}}

/* insights */
.posts{display:grid;grid-template-columns:repeat(2,1fr);gap:18px} @media (max-width:700px){.posts{grid-template-columns:1fr}}
.post{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:28px 28px 24px;display:flex;flex-direction:column;gap:10px}
.post .meta{font-size:13px;color:var(--ink-2)} .post h3{font-size:22px} .post p{color:var(--ink-2);font-size:15.5px}
.post a.link{margin-top:auto;padding-top:8px}
.article{max-width:680px;margin:0 auto} .article p{margin:0 0 22px;font-size:19px;line-height:1.55} .article h2{font-size:30px;margin:44px 0 14px} .article h3{margin:32px 0 10px} .article ul,.article ol{font-size:19px;line-height:1.55;margin:0 0 22px;padding-left:24px} .article li{margin-bottom:8px}
.article blockquote{margin:0 0 22px;padding-left:20px;border-left:3px solid var(--ink);font-size:21px;line-height:1.45;color:var(--ink)}

/* footer */
.footer{background:var(--ground);padding:40px 22px;font-size:13px;color:var(--ink-2);border-top:1px solid var(--line)}
.footer .wrap{display:flex;flex-direction:column;gap:14px}
.footer ul{list-style:none;margin:0;padding:0;display:flex;gap:20px;flex-wrap:wrap} .footer a{color:var(--ink-2)}
.footer .legal{max-width:760px;line-height:1.5}

/* app (ocho.tools) */
.app{display:grid;grid-template-columns:240px 1fr;min-height:100vh}
.side{background:var(--ground);border-right:1px solid var(--line);padding:22px 16px;display:flex;flex-direction:column;gap:6px;position:sticky;top:0;height:100vh}
.side .brand{padding:6px 10px 18px} .side .brand img{height:20px}
.side a{display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:10px;color:var(--ink);font-size:15px}
.side a:hover{background:#e8e8ed;text-decoration:none} .side a.on{background:var(--ink);color:#fff}
.side a .st{margin-left:auto;font-size:11px;color:var(--ink-2);background:#e8e8ed;border-radius:6px;padding:2px 6px} .side a.on .st{background:#333;color:#ddd}
.side .bottom{margin-top:auto;font-size:13px;color:var(--ink-2);padding:0 10px}
.main{padding:34px 40px;max-width:1100px;width:100%}
.main h1{font-size:34px;letter-spacing:-.02em;margin-bottom:6px}
.main .sub{color:var(--ink-2);margin-bottom:30px}
.mods{display:grid;grid-template-columns:repeat(3,1fr);gap:14px} @media (max-width:1000px){.mods{grid-template-columns:repeat(2,1fr)}} @media (max-width:640px){.mods{grid-template-columns:1fr}}
.mod{border:1px solid var(--line);border-radius:14px;padding:22px 20px;display:flex;flex-direction:column;gap:8px;background:#fff;min-height:150px}
.mod h3{font-size:18px} .mod p{color:var(--ink-2);font-size:14.5px} .mod .foot{margin-top:auto;display:flex;justify-content:space-between;align-items:center;font-size:13px;color:var(--ink-2)}
.pill{font-size:12px;font-weight:500;border-radius:6px;padding:3px 8px;background:var(--ground);color:var(--ink-2)} .pill.live{background:#e9f7ee;color:#0f5a30} .pill.beta{background:#eef2ff;color:var(--accent-ink)}
@media (max-width:860px){.app{grid-template-columns:1fr}.side{position:static;height:auto;flex-direction:row;flex-wrap:wrap;border-right:0;border-bottom:1px solid var(--line)}.side .brand{width:100%;padding-bottom:8px}.side .bottom{display:none}.main{padding:22px}}
/* chat */
.chat{display:flex;flex-direction:column;height:calc(100vh - 68px);max-width:820px}
.chat .log{flex:1;overflow:auto;display:flex;flex-direction:column;gap:14px;padding:10px 4px 20px}
.msg{max-width:88%;padding:12px 16px;border-radius:16px;font-size:16px;line-height:1.5;white-space:pre-wrap}
.msg.me{align-self:flex-end;background:var(--ink);color:#fff;border-bottom-right-radius:6px}
.msg.ai{align-self:flex-start;background:var(--ground);border-bottom-left-radius:6px}
.msg .src{display:block;margin-top:8px;font-size:13px;color:var(--ink-2)} .msg.ai .src a{display:block}
.chat form{display:flex;gap:10px;padding:12px 0 0;border-top:1px solid var(--line)}
.chat textarea{flex:1;min-height:52px;max-height:160px}
.gate{min-height:100vh;display:grid;place-items:center;padding:22px;background:var(--ground)}
.gate .card{background:#fff;border-radius:22px;padding:44px 40px;width:min(420px,100%);display:flex;flex-direction:column;gap:18px;border:1px solid var(--line)}
.gate img{height:26px;width:auto}
/* nav buttons must win over .nav-links a color */
.nav-links a.btn-ink{color:#fff} .nav-links a.btn-ink:hover{background:#000}
.nav.dark .nav-links a.btn-light{color:var(--ink)} .nav.dark .nav-links a.btn-light:hover{border-color:#fff}