/* ChatsAPI.com — purpose-built offline-ready, JavaScript-free static site */
:root{color-scheme:light;--bg:#fafbfc;--white:#fff;--ink:#111a31;--soft:#48566d;--muted:#66748a;--line:#dbe1eb;--blue:#3156ec;--blue-dark:#2543bf;--mint:#caf7e6;--mint-deep:#0f7655;--lav:#e9e9ff;--dark:#0e1630;--sans:ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;--mono:ui-monospace,SFMono-Regular,Consolas,"Liberation Mono",monospace}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.7 var(--sans);-webkit-font-smoothing:antialiased}img,svg{max-width:100%;height:auto}a{color:var(--blue-dark);text-underline-offset:3px;text-decoration-thickness:1px}a:hover{color:#142c91}a:focus-visible,summary:focus-visible{outline:3px solid #f5ad38;outline-offset:4px}::selection{background:var(--mint);color:var(--ink)}.container{width:min(1180px,100% - 48px);margin:auto}.skip{position:absolute;left:14px;top:-80px;background:var(--white);z-index:99;padding:12px 20px;border:2px solid var(--blue)}.skip:focus{top:10px}.statusbar{height:4px;background:linear-gradient(90deg,#3156ec,#9b9dfb 45%,#83e1b5 100%)}
.site-header{position:relative;z-index:20;background:rgba(255,255,255,.97);border-bottom:1px solid var(--line)}.head-inner{min-height:76px;display:flex;align-items:center;gap:36px}.brand{display:flex;align-items:center;gap:10px;font-size:21px;letter-spacing:-.95px;font-weight:830;color:var(--ink);text-decoration:none;white-space:nowrap}.brand strong{color:var(--blue);font-weight:850}.mark{width:35px;height:35px;border-radius:11px;background:var(--blue);display:grid;place-items:center;color:white;font:800 18px var(--mono);letter-spacing:-3px;padding-right:4px;box-shadow:0 5px 12px #3156ec36}.desktop-nav{margin-left:auto;display:flex;align-items:center;gap:4px}.desktop-nav a{color:#4a5770;text-decoration:none;padding:9px 12px;border-radius:9px;font-size:14px;font-weight:650}.desktop-nav a:hover,.desktop-nav a[aria-current=page]{background:#eff2ff;color:var(--blue-dark)}.nav-button{margin-left:8px!important;border:1px solid #cbd5f5!important;color:var(--blue-dark)!important;padding:9px 15px!important}.mobile-nav{display:none;margin-left:auto}.mobile-nav summary{font-weight:700;list-style:none;padding:8px 15px;border:1px solid var(--line);border-radius:8px;cursor:pointer}.mobile-nav summary::-webkit-details-marker{display:none}.mobile-menu-list{position:absolute;top:100%;left:0;right:0;box-shadow:0 15px 26px #111a3122;background:#fff;padding:12px 24px 22px;border-bottom:1px solid var(--line)}.mobile-menu-list a{display:block;font-size:15px;font-weight:650;padding:10px;border-bottom:1px solid #edf0f5;text-decoration:none}
.eyebrow{font-weight:800;font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--blue)}.hero{padding:98px 0 96px;background:radial-gradient(ellipse 450px 320px at 82% 25%,#e0edff 0%,transparent 82%),linear-gradient(180deg,#fff 0%,#f6f8fc 100%);border-bottom:1px solid var(--line)}.hero-grid{display:grid;grid-template-columns:minmax(0,1.07fr) minmax(330px,.93fr);gap:70px;align-items:center}.hero h1{font-size:clamp(43px,5.7vw,75px);line-height:1.07;letter-spacing:-.066em;font-weight:850;margin:20px 0 24px;max-width:710px}.hero h1 em{color:var(--blue);font-style:normal}.hero-lead{font-size:18px;color:var(--soft);line-height:1.78;max-width:620px;margin:0 0 28px}.actions{display:flex;gap:12px;flex-wrap:wrap}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:11px 20px;border-radius:10px;border:1px solid var(--line);background:#fff;color:var(--ink);font-weight:750;text-decoration:none;font-size:14px;transition:transform .18s,background .18s}.btn:hover{transform:translateY(-2px);background:#f2f4ff;text-decoration:none}.btn-primary{background:var(--blue);border-color:var(--blue);color:#fff}.btn-primary:hover{background:var(--blue-dark);color:white}.fineprint{font-size:12px;color:var(--muted);margin-top:22px;line-height:1.6}.fineprint strong{color:var(--ink)}
.terminal-card{border:1px solid #d0d8e9;border-radius:17px;overflow:hidden;box-shadow:0 28px 60px #172c6040;background:#fff;transform:rotate(.4deg)}.terminal-top{background:#111a31;color:#d9e7fa;padding:14px 18px;font:600 12px var(--mono);display:flex;align-items:center;gap:10px}.lights{display:flex;gap:5px}.lights i{width:8px;height:8px;border-radius:50%;background:#fc867c}.lights i:nth-child(2){background:#fed27b}.lights i:nth-child(3){background:#8cdfbe}.terminal-inner{background:#15213e;padding:26px 30px 28px;color:#d7e3fa;font:13px/1.8 var(--mono)}.terminal-inner .dim{color:#87a3c7}.terminal-inner .green{color:#9befcc}.terminal-inner .accent{color:#a4b9ff}.terminal-inner .line{display:block;white-space:pre-wrap}.term-sep{height:1px;background:#405170;margin:20px 0}.route-bar{display:grid;grid-template-columns:1fr auto 1fr auto 1fr;gap:9px;align-items:center;margin-top:14px;font-size:11px;font-weight:800;letter-spacing:.04em;color:#d5e4ff}.route-bar span{background:#28385d;padding:10px 5px;text-align:center;border:1px solid #425479;border-radius:7px}.route-bar b{font-size:17px;color:#80dcb6}
.strip{background:#fff;border-bottom:1px solid var(--line)}.strip-inner{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:21px 0}.strip-label{font-size:12px;letter-spacing:.1em;color:var(--muted);font-weight:800;text-transform:uppercase}.strip-points{display:flex;gap:28px;flex-wrap:wrap}.strip-points span{font-size:13px;color:var(--soft);font-weight:650}.strip-points span:before{content:'●';color:#1ba87d;margin-right:8px;font-size:11px}
.section{padding:88px 0}.section-alt{background:#f1f4fa}.section-heading{max-width:750px;margin-bottom:35px}.section-heading h2{font-size:clamp(30px,3.5vw,46px);line-height:1.17;letter-spacing:-.048em;margin:12px 0 13px}.section-heading p{font-size:17px;color:var(--soft);margin:0}.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.card{background:#fff;padding:28px;border:1px solid var(--line);border-radius:15px;box-shadow:0 5px 22px #172a5b08}.card-num{display:inline-grid;place-items:center;width:39px;height:39px;border-radius:10px;background:#edf0ff;color:var(--blue);font:800 13px var(--mono)}.card h3{font-size:20px;letter-spacing:-.025em;margin:25px 0 9px}.card p{color:var(--soft);font-size:14px;line-height:1.8;margin:0 0 17px}.card a{font-size:14px;font-weight:750;text-decoration:none}.card a:hover{text-decoration:underline}.feature-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}.bullet-lines{display:grid;gap:15px}.bullet-line{display:flex;gap:15px;align-items:flex-start;padding:15px 0;border-bottom:1px solid var(--line)}.bullet-line strong{display:block;color:var(--ink);font-size:16px}.bullet-line p{margin:3px 0 0;font-size:14px;color:var(--soft)}.bullet-line .bullet-icon{background:#e1f8ee;width:36px;height:36px;min-width:36px;border-radius:10px;display:grid;place-items:center;color:#0f7655;font-weight:900}.diagram{border:1px solid var(--line);border-radius:18px;background:white;padding:28px;box-shadow:0 14px 30px #1a2b5311}.diagram-head{display:flex;justify-content:space-between;font:750 12px var(--mono);color:#526276;margin-bottom:20px}.diagram-stack{display:flex;flex-direction:column;gap:13px}.diagram-node{padding:17px 20px;border:1px solid #d4ddef;border-radius:10px;background:#f7f9ff}.diagram-node span{font:750 12px var(--mono);color:var(--blue)}.diagram-node strong{display:block;font-size:17px;margin-top:1px}.diagram-node p{font-size:12px;color:var(--soft);margin:2px 0}.diagram-arrow{text-align:center;font-size:19px;line-height:1;color:#6f85c8}.diagram-node:last-child{background:#ecfcf5;border-color:#b4e5d2}.link-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.link-grid a{display:flex;align-items:center;justify-content:space-between;background:white;padding:19px 22px;border:1px solid var(--line);border-radius:10px;text-decoration:none;font-weight:700;color:var(--ink)}.link-grid a:hover{border-color:#8295fc;color:var(--blue)}.cta{padding:80px 0;background:#131e3a;color:white}.cta-inner{display:flex;justify-content:space-between;align-items:center;gap:30px}.cta h2{font-size:clamp(30px,3.4vw,45px);letter-spacing:-.045em;line-height:1.15;margin:0 0 10px}.cta p{color:#c0d0e4;max-width:620px;margin:0}.cta .btn{white-space:nowrap}
.page-head{padding:65px 0 58px;background:#fff;border-bottom:1px solid var(--line)}.crumbs{font-size:13px;color:var(--muted);display:flex;gap:10px;align-items:center;margin-bottom:28px}.crumbs a{color:var(--muted);text-decoration:none}.crumbs a:hover{text-decoration:underline}.page-head h1{font-size:clamp(36px,4.3vw,59px);max-width:920px;letter-spacing:-.055em;line-height:1.14;margin:13px 0 18px}.page-head .lead{font-size:19px;color:var(--soft);max-width:800px;margin:0;line-height:1.75}.page-meta{display:flex;gap:15px;flex-wrap:wrap;color:var(--muted);font-size:12px;margin-top:23px}.article-layout{display:grid;grid-template-columns:minmax(0,780px) minmax(190px,1fr);gap:72px;padding-top:56px;padding-bottom:90px;align-items:start}.prose{font-size:16px;line-height:1.83;min-width:0}.prose h2{font-size:29px;line-height:1.27;letter-spacing:-.035em;margin:47px 0 17px;scroll-margin-top:22px}.prose h2:first-child{margin-top:0}.prose h3{font-size:20px;line-height:1.35;letter-spacing:-.018em;margin:28px 0 8px}.prose p{color:#3f4d61;margin:0 0 17px}.prose ul,.prose ol{margin:0 0 22px;padding-left:24px;color:#425066}.prose li{margin-bottom:10px;padding-left:4px}.prose strong{color:var(--ink)}.prose blockquote{border-left:3px solid var(--blue);padding:6px 18px;background:#f0f3ff;margin:22px 0}.prose code{font:13px/1.65 var(--mono);color:#2542ad;background:#eef1fc;border-radius:4px;padding:2px 5px;overflow-wrap:anywhere}.prose pre{background:#14203a;color:#e0eaff;border-radius:12px;padding:22px 24px;overflow-x:auto;font:13px/1.75 var(--mono);margin:22px 0 28px}.prose pre code{background:transparent;color:inherit;padding:0;font:inherit;white-space:pre}.prose table{border-collapse:collapse;margin:24px 0 32px;width:100%;font-size:13px;line-height:1.65}.prose th,.prose td{border:1px solid #d9e0ec;padding:12px 13px;vertical-align:top;text-align:left}.prose th{background:#eff3ff;color:#17284c}.prose td{color:#46546b}.prose .notice{background:#ecf5ff;padding:18px 22px;border-left:3px solid #5281dc;border-radius:0 8px 8px 0;color:#385572;font-size:14px;margin:2px 0 29px}.rail{position:sticky;top:30px;border-left:1px solid var(--line);padding-left:25px}.rail h2{font-size:11px;letter-spacing:.13em;color:var(--muted);text-transform:uppercase;margin:0 0 18px}.rail a{display:block;font-size:13px;color:#536179;text-decoration:none;padding:7px 0}.rail a:hover{color:var(--blue);text-decoration:underline}.rail .rail-button{margin-top:20px;padding:12px;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--blue);font-weight:700}.endnote{margin-top:40px;border-top:1px solid var(--line);padding:22px 0;color:var(--muted);font-size:13px}.endnote a{font-weight:700}.footer{background:#0c1630;color:#d9e4f4;padding:68px 0 25px}.foot-grid{display:grid;grid-template-columns:minmax(0,2.2fr) 1fr 1fr;gap:70px}.footer .brand{color:#fff}.footer .mark{background:#8c9dff;color:#0c1630}.footer .brand strong{color:#98b1ff}.footer p{font-size:14px;color:#acb8cf;max-width:400px;line-height:1.85}.footer h2{font-size:13px;color:#fff;margin:0 0 18px}.foot-links{display:flex;flex-direction:column;gap:9px}.foot-links a{color:#b5c2d7;text-decoration:none;font-size:13px}.foot-links a:hover{color:#fff;text-decoration:underline}.foot-bottom{border-top:1px solid #293553;margin-top:50px;padding-top:21px;color:#97a8c3;font-size:12px;display:flex;justify-content:space-between;gap:24px}.pill{display:inline-block;border-radius:6px;background:#e5f8ef;border:1px solid #b6eacb;color:#147454;padding:4px 10px;font-weight:750;font-size:11px;letter-spacing:.04em;text-transform:uppercase}.page-notfound{text-align:center;padding:110px 20px 150px}.page-notfound h1{font-size:60px;letter-spacing:-.06em;margin:12px 0}.page-notfound p{color:var(--soft);margin:0 auto 25px;max-width:580px}
@media(max-width:1000px){.desktop-nav a{padding:8px}.hero-grid{gap:32px}.terminal-inner{padding:22px 20px}.feature-grid{gap:35px}.article-layout{gap:40px}}@media(max-width:800px){.desktop-nav{display:none}.mobile-nav{display:block}.hero{padding:72px 0}.hero-grid{grid-template-columns:1fr;gap:36px}.hero h1{max-width:770px}.terminal-card{max-width:620px;transform:none}.cards{grid-template-columns:1fr 1fr}.strip-inner{align-items:flex-start;flex-direction:column;gap:5px}.article-layout{grid-template-columns:1fr;gap:25px}.rail{display:none}.foot-grid{gap:40px}.feature-grid{grid-template-columns:1fr}.cta-inner{align-items:flex-start;flex-direction:column}.page-head{padding:52px 0}}@media(max-width:560px){body{font-size:15px}.container{width:min(100% - 36px,1180px)}.head-inner{min-height:68px}.brand{font-size:19px}.mark{height:32px;width:32px}.hero{padding:55px 0 65px}.hero h1{font-size:45px}.hero-lead{font-size:16px}.terminal-inner{font-size:11px;padding:21px 15px}.terminal-top{font-size:10px}.route-bar{gap:5px;font-size:9px}.route-bar span{padding:7px 3px}.cards,.link-grid{grid-template-columns:1fr}.section{padding:62px 0}.section-heading h2{font-size:33px}.page-head h1{font-size:38px}.page-head .lead{font-size:16px}.prose{font-size:15px}.prose h2{font-size:25px}.prose table{display:block;overflow-x:auto}.foot-grid{grid-template-columns:1fr 1fr;gap:28px}.foot-grid>div:first-child{grid-column:1/-1}.foot-bottom{flex-direction:column;gap:8px}.card{padding:25px}.cta{padding:60px 0}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}}