:root{--ink:#1F2328;--paper:#F7F5F0;--navy:#14213D;--teal:#2A9D8F;--muted:#5B6470;--line:#D9D4C9;--max:1120px}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:400 17px/1.6 Inter,system-ui,-apple-system,"Segoe UI",sans-serif}
a{color:var(--teal);text-decoration:none}a:hover,a:focus-visible{text-decoration:underline;text-underline-offset:3px}
:focus-visible{outline:2px solid var(--teal);outline-offset:3px}
h1,h2,h3{font-family:"Instrument Serif",Georgia,serif;font-weight:400;letter-spacing:-.01em;line-height:1.05;margin:0}
h1{font-size:clamp(2.3rem,4.2vw,3.5rem);max-width:16ch}h2{font-size:clamp(1.9rem,3.6vw,2.6rem);margin-bottom:.6em}h3{font-size:1.45rem;margin-bottom:.35em}
p{margin:0 0 1em;max-width:68ch}
.wrap{max-width:var(--max);margin:0 auto;padding:0 clamp(20px,5vw,56px)}
header{padding:28px 0}header .wrap{display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{font-family:"Instrument Serif",Georgia,serif;font-size:1.35rem;color:var(--ink)}.brand:hover{text-decoration:none}
nav a{color:var(--ink);margin-left:26px;font-size:.95rem}nav a[aria-current]{color:var(--teal)}
.hero{padding:clamp(40px,8vw,96px) 0 clamp(48px,8vw,104px)}
.hero .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(32px,6vw,80px);align-items:center}
.hero p.lead{font-size:1.2rem;color:var(--muted);margin:1.2em 0 1.6em;max-width:34ch}
.btn{display:inline-block;background:var(--navy);color:#fff;padding:14px 22px;border-radius:6px;font-weight:500}.btn:hover{text-decoration:none;background:#0F1A31}
/* demo panel */
.demo{background:var(--navy);color:#E8ECF4;border-radius:14px;padding:22px 22px 18px;box-shadow:0 30px 60px -30px rgba(20,33,61,.55);font-size:.95rem}
.demo .bar{display:flex;align-items:center;gap:10px;color:#AEB8CC;font-size:.85rem;margin-bottom:16px}
.dot{width:8px;height:8px;border-radius:50%;background:var(--teal);box-shadow:0 0 0 0 rgba(42,157,143,.6);animation:pulse 2.4s infinite}
@keyframes pulse{70%{box-shadow:0 0 0 9px rgba(42,157,143,0)}100%{box-shadow:0 0 0 0 rgba(42,157,143,0)}}
.msg{max-width:88%;padding:11px 14px;border-radius:12px;margin:0 0 10px;line-height:1.45;opacity:0;transform:translateY(6px);animation:in .5s forwards}
.msg.me{background:#2B3A5C;margin-left:auto;border-bottom-right-radius:4px}
.msg.bot{background:#1B2A4A;border:1px solid #2E3E62;border-bottom-left-radius:4px}
.msg .tag{color:var(--teal);font-weight:600}
.msg:nth-child(2){animation-delay:.3s}.msg:nth-child(3){animation-delay:1.2s}.msg:nth-child(4){animation-delay:2.4s}.msg:nth-child(5){animation-delay:3.3s}
@keyframes in{to{opacity:1;transform:none}}
@media(prefers-reduced-motion:reduce){.msg{animation:none;opacity:1;transform:none}.dot{animation:none}}
section{padding:clamp(40px,7vw,88px) 0;border-top:1px solid var(--line)}
.cols{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(24px,4vw,48px)}
.cols p{font-size:1rem;color:var(--muted)}
.case{display:grid;grid-template-columns:1fr 1fr;gap:clamp(28px,5vw,72px);align-items:start}
.case dl{margin:0;display:grid;grid-template-columns:auto 1fr;gap:10px 22px;font-size:1rem}.case dt{color:var(--muted)}.case dd{margin:0}
.note{font-size:.9rem;color:var(--muted)}
footer{border-top:1px solid var(--line);padding:32px 0 48px;font-size:.9rem;color:var(--muted)}
footer .wrap{display:flex;flex-wrap:wrap;gap:12px 28px;justify-content:space-between}footer a{color:var(--muted)}
.legal h1{font-size:clamp(2rem,4.5vw,3rem)}.legal table{border-collapse:collapse;margin:24px 0;width:100%;max-width:760px}
.legal td{padding:11px 0;border-bottom:1px solid var(--line);vertical-align:top}.legal td:first-child{color:var(--muted);width:40%;padding-right:20px}
.legal .ph{background:#FFF3C4;padding:0 4px;border-radius:3px}
@media(max-width:860px){.hero .wrap,.cols,.case{grid-template-columns:1fr}.hero{padding-top:24px}nav a{margin-left:16px}}