/* Roll website: shared design system (dark)
   Tokens mirror the Claude Design source: bg #0A0A0A, accent #FF6B2C,
   Playfair Display for display type, system-ui for body. */
:root{
  --bg:#0A0A0A; --card:#141414; --line:#1A1A1A; --line2:#1E1E1E;
  --accent:#FF6B2C; --fg:#FFFFFF; --muted:#888888; --dim:#555555;
  --green:#4ADE80; --star:#FBBF24;
  --serif:'Playfair Display',Georgia,serif; --sans:system-ui,-apple-system,sans-serif;
  --maxw:1200px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--fg);font-family:var(--sans);overflow-x:hidden;-webkit-font-smoothing:antialiased}
a{color:var(--fg);text-decoration:none}
a:hover{color:var(--accent)}
img{max-width:100%;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 32px}
.serif{font-family:var(--serif)}
.muted{color:var(--muted)}

/* NAV */
.nav{position:sticky;top:0;z-index:60;background:rgba(10,10,10,.82);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);border-bottom:1px solid var(--line)}
.nav-in{max-width:var(--maxw);margin:0 auto;padding:0 32px;min-height:72px;display:flex;align-items:center;flex-wrap:wrap;gap:12px 24px;justify-content:space-between}
.brand{display:inline-flex;align-items:center;gap:.26em;font:600 20px var(--serif);color:var(--fg)}
.brand .mark{width:.82em;height:.86em;flex:none;background-color:var(--accent);-webkit-mask:url(/img/logo-mark.png) center/contain no-repeat;mask:url(/img/logo-mark.png) center/contain no-repeat}
.nav-links{display:flex;align-items:center;flex-wrap:wrap;gap:10px 26px}
.nav-links a{color:var(--fg);font:500 12px var(--sans);letter-spacing:2px;text-transform:uppercase}
.nav-links a.active{color:var(--accent)}
.btn{display:inline-flex;align-items:center;justify-content:center;border-radius:50px;white-space:nowrap;cursor:pointer;transition:transform .15s ease,opacity .15s ease}
.btn:hover{transform:translateY(-1px)}
.btn-white{height:42px;background:#fff;color:#0A0A0A;padding:0 22px;font:600 14px var(--sans)}
.btn-white:hover{color:#0A0A0A;opacity:.9}
.btn-accent{background:var(--accent);color:#0A0A0A;font-weight:700}
.btn-accent:hover{color:#0A0A0A;opacity:.92}

/* generic sections */
.section{margin-top:130px}
.h-display{font:600 clamp(28px,3.3vw,40px)/1.14 var(--serif);letter-spacing:-.02em;text-align:center;text-wrap:pretty}
.lead{color:var(--muted);font:400 16px/1.6 var(--sans);text-wrap:pretty}
.eyebrow{display:inline-flex;align-items:center;gap:9px;height:32px;border-radius:50px;border:1px solid #222;padding:0 14px;color:var(--muted);font:500 11px var(--sans);letter-spacing:2px;text-transform:uppercase}
.eyebrow .dot{width:5px;height:5px;border-radius:50%;background:var(--accent)}
.card{border-radius:20px;background:var(--card);border:1px solid var(--line2);padding:24px}

/* FAQ (native details) */
.faq details{border-bottom:1px solid #222}
.faq summary{list-style:none;padding:22px 0;display:flex;align-items:flex-start;gap:20px;cursor:pointer;font:600 16px/1.45 var(--sans);color:var(--fg)}
.faq summary::-webkit-details-marker{display:none}
.faq summary .q{flex:1}
.faq summary .ic{flex:none;width:20px;height:20px;display:flex;align-items:center;justify-content:center;color:var(--dim);font:400 20px var(--sans);line-height:1}
.faq details[open] summary .ic{color:var(--accent)}
.faq summary .ic::after{content:"+"}
.faq details[open] summary .ic::after{content:"\2212"}
.faq .a{padding:0 44px 24px 0;color:var(--muted);font:400 14px/1.7 var(--sans);text-wrap:pretty}

/* use-case tabs */
.case-tab{padding:11px 0;font:400 17px var(--sans);color:var(--dim);cursor:pointer;border-bottom:1px solid #161616;transition:color .18s ease;user-select:none}
.case-tab:last-child{border-bottom:none}
.case-tab.on{color:#fff;font-weight:600}

/* footer */
.footer{margin-top:100px;padding-bottom:48px}
.footer-cols{border-top:1px solid var(--line);padding-top:44px;display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:36px}
.footer-col{display:flex;flex-direction:column;gap:12px}
.footer-col .head{color:var(--dim);font:600 11px var(--sans);letter-spacing:2px;text-transform:uppercase}
.footer-col a{color:var(--muted);font:400 14px var(--sans)}
.footer-bottom{margin-top:44px;padding-top:26px;border-top:1px solid var(--line);display:flex;align-items:center;flex-wrap:wrap;gap:16px 24px;justify-content:space-between}

/* article / legal */
.article{max-width:720px;margin:64px auto 0;padding:0 32px}
.article .kicker{color:var(--accent);font:600 11px var(--sans);letter-spacing:2px;text-transform:uppercase}
.article h1{font:600 clamp(30px,4vw,46px)/1.1 var(--serif);letter-spacing:-.02em;margin:18px 0 0;text-wrap:pretty}
.article .meta{margin-top:16px;color:var(--dim);font:400 13px var(--sans)}
.article .body{margin-top:36px;color:#c8c8c8;font:400 17px/1.75 var(--sans)}
.article .body h2{color:#fff;font:600 24px/1.3 var(--serif);margin:44px 0 14px}
.article .body p{margin:0 0 22px}
.article .body ul{margin:0 0 22px;padding-left:22px}
.article .body li{margin:0 0 10px;color:#c8c8c8}
.article .body a{color:#fff;border-bottom:1px solid #444}
.article .body blockquote{margin:32px 0;padding-left:22px;border-left:2px solid var(--accent);color:#fff;font:500 italic 22px/1.4 var(--serif)}
.article .body strong{color:#fff}

/* blog index cards */
.post-grid{margin-top:48px;display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:20px}
.post-card{border-radius:20px;background:var(--card);border:1px solid var(--line2);overflow:hidden;display:flex;flex-direction:column;transition:border-color .18s ease,transform .18s ease}
.post-card:hover{border-color:#333;transform:translateY(-3px)}
.post-card .cover{height:180px;position:relative;overflow:hidden}
.post-card .cover .grain{position:absolute;inset:0;opacity:.15;mix-blend-mode:overlay;pointer-events:none}
.post-card .pc-body{padding:22px;display:flex;flex-direction:column;gap:10px;flex:1}
.post-card .pc-body .t{font:600 19px/1.3 var(--serif);color:#fff}
.post-card .pc-body .e{color:var(--muted);font:400 14px/1.6 var(--sans);flex:1}
.post-card .pc-body .d{color:var(--dim);font:400 12px var(--sans)}

/* join */
.join-wrap{max-width:520px;margin:80px auto 0;padding:0 32px;text-align:center}
.code-in{margin-top:28px;width:100%;height:64px;border-radius:16px;background:var(--card);border:1px solid #2A2A2A;color:#fff;font:600 26px var(--sans);letter-spacing:8px;text-align:center;text-transform:uppercase;outline:none}
.code-in:focus{border-color:var(--accent)}

/* mobile */
@media (max-width:720px){
  .wrap,.nav-in{padding:0 20px}
  .article{padding:0 20px}
  .nav-links{gap:8px 16px}
  .nav-links a{font-size:11px;letter-spacing:1px}
  .section{margin-top:96px}
}