:root{
  --bg:#f6f8fc;--surface:#fff;--surface-2:#eef3ff;--text:#172033;--muted:#647089;
  --primary:#4f46e5;--primary-2:#7c3aed;--accent:#06b6d4;--border:#e5e9f2;
  --shadow:0 18px 50px rgba(25,35,70,.10);--radius:20px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--text);background:var(--bg);line-height:1.7}
a{color:inherit;text-decoration:none}
button,input,textarea{font:inherit}
img{max-width:100%}
.container{width:min(1160px,92%);margin:auto}
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(14px);border-bottom:1px solid var(--border)}
.nav{min-height:74px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:flex;align-items:center;gap:11px;font-weight:900;font-size:1.25rem}
.logo{width:42px;height:42px;border-radius:13px;background:linear-gradient(135deg,var(--primary),var(--primary-2));display:grid;place-items:center;color:#fff;box-shadow:0 8px 22px rgba(79,70,229,.28)}
.logo svg{width:23px}
.nav-links{display:flex;align-items:center;gap:7px}
.nav-links a{padding:10px 13px;border-radius:11px;color:#4c5870;font-weight:700;font-size:.94rem}
.nav-links a:hover,.nav-links a.active{background:var(--surface-2);color:var(--primary)}
.menu-btn{display:none;border:1px solid var(--border);background:#fff;border-radius:11px;padding:9px 11px;cursor:pointer}
.hero{padding:90px 0 70px;background:radial-gradient(circle at 10% 10%,#e6eaff 0,transparent 35%),radial-gradient(circle at 90% 20%,#dffbff 0,transparent 32%),linear-gradient(180deg,#fff 0,#f6f8fc 100%)}
.hero-grid{display:grid;grid-template-columns:1.12fr .88fr;gap:55px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;padding:7px 12px;border-radius:999px;background:#e9edff;color:var(--primary);font-weight:800;font-size:.82rem}
h1{font-size:clamp(2.45rem,6vw,4.6rem);line-height:1.04;letter-spacing:-.055em;margin:20px 0}
h2{font-size:clamp(1.75rem,3vw,2.5rem);line-height:1.15;letter-spacing:-.03em;margin:0 0 14px}
h3{line-height:1.25;margin-top:0}
.lead{font-size:1.12rem;color:var(--muted);max-width:680px}
.actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:13px;padding:13px 19px;font-weight:800;cursor:pointer;transition:.2s}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;box-shadow:0 10px 24px rgba(79,70,229,.23)}
.btn-primary:hover{transform:translateY(-2px)}
.btn-secondary{background:#fff;border:1px solid var(--border);color:var(--text)}
.hero-card{background:#fff;border:1px solid var(--border);border-radius:26px;padding:22px;box-shadow:var(--shadow)}
.mock-top{display:flex;justify-content:space-between;align-items:center;padding-bottom:16px;border-bottom:1px solid var(--border)}
.status{display:inline-flex;align-items:center;gap:7px;font-size:.84rem;color:#2d7a55;font-weight:800}
.dot{width:9px;height:9px;border-radius:50%;background:#22c55e}
.mock-chat{display:flex;flex-direction:column;gap:12px;padding:20px 0}
.bubble{max-width:82%;padding:12px 14px;border-radius:16px;background:#f0f3fa;color:#42506a}
.bubble.me{align-self:flex-end;background:#5a51e7;color:#fff;border-bottom-right-radius:5px}
.bubble.them{border-bottom-left-radius:5px}
.section{padding:76px 0}
.section-head{max-width:730px;margin-bottom:30px}
.grid{display:grid;gap:20px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:25px;box-shadow:0 8px 30px rgba(25,35,70,.05)}
.icon{width:46px;height:46px;border-radius:14px;background:var(--surface-2);color:var(--primary);display:grid;place-items:center;margin-bottom:16px}
.icon svg{width:23px}
.text-page{padding:64px 0}
.prose{background:#fff;border:1px solid var(--border);border-radius:24px;padding:clamp(24px,5vw,54px);box-shadow:0 10px 35px rgba(25,35,70,.05)}
.prose h1{font-size:clamp(2.2rem,5vw,3.6rem);margin-top:0}
.prose h2{font-size:1.55rem;margin-top:36px}
.prose p,.prose li{color:#526078}
.prose ul{padding-left:22px}
.note{background:#f2f5ff;border-left:4px solid var(--primary);padding:15px 18px;border-radius:10px;color:#44516a}
.cta{background:linear-gradient(135deg,#151a35,#30258f);color:#fff;border-radius:28px;padding:42px}
.cta p{color:#d8dcf2}
.site-footer{background:#101426;color:#b9c0d5;padding:45px 0 24px;margin-top:30px}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:35px}
.footer-brand{color:#fff}
.footer-links{display:flex;flex-direction:column;gap:9px}
.footer-links a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);margin-top:30px;padding-top:18px;display:flex;justify-content:space-between;gap:15px;flex-wrap:wrap;font-size:.9rem}
.chat-shell{padding:45px 0 65px}
.chat-layout{display:grid;grid-template-columns:270px 1fr;gap:18px;min-height:690px}
.rooms,.chat-panel{background:#fff;border:1px solid var(--border);border-radius:22px;box-shadow:0 8px 30px rgba(25,35,70,.05)}
.rooms{padding:18px}
.room-title{font-weight:900;margin-bottom:14px}
.room{width:100%;border:0;background:transparent;text-align:left;padding:12px;border-radius:12px;display:flex;align-items:center;gap:10px;cursor:pointer;color:#4d5870}
.room:hover,.room.selected{background:#eef1ff;color:var(--primary)}
.avatar{width:36px;height:36px;border-radius:50%;display:grid;place-items:center;background:#e9edff;color:var(--primary);font-weight:900;flex:0 0 auto}
.chat-panel{display:flex;flex-direction:column;overflow:hidden}
.chat-head{padding:18px 20px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between}
.chat-title{font-weight:900}
.messages{padding:20px;display:flex;flex-direction:column;gap:12px;flex:1;min-height:430px;max-height:520px;overflow:auto;background:#fbfcff}
.msg{max-width:min(75%,620px);padding:12px 15px;border-radius:16px;background:#eef1f7;color:#3f4c63}
.msg.self{align-self:flex-end;background:#574ee5;color:#fff}
.msg small{display:block;opacity:.65;margin-top:4px;font-size:.72rem}
.composer{display:flex;gap:10px;padding:15px;border-top:1px solid var(--border)}
.composer input{flex:1;min-width:0;border:1px solid var(--border);border-radius:13px;padding:12px 14px;outline:none}
.composer input:focus{border-color:var(--primary);box-shadow:0 0 0 3px #e8eaff}
.empty{color:var(--muted);text-align:center;padding:25px}
.kicker{color:var(--primary);font-weight:900;font-size:.84rem;text-transform:uppercase;letter-spacing:.08em}
.faq{border-top:1px solid var(--border);padding:18px 0}
.faq h3{margin:0 0 7px}
@media(max-width:900px){
 .hero-grid{grid-template-columns:1fr}.grid-3{grid-template-columns:1fr 1fr}.chat-layout{grid-template-columns:1fr}.rooms{display:flex;gap:8px;overflow:auto}.room-title{display:none}.room{min-width:145px}.messages{max-height:none}
}
@media(max-width:700px){
 .nav{min-height:66px}.menu-btn{display:block}.nav-links{display:none;position:absolute;left:4%;right:4%;top:70px;background:#fff;border:1px solid var(--border);border-radius:16px;padding:10px;box-shadow:var(--shadow);flex-direction:column;align-items:stretch}.nav-links.open{display:flex}.nav-links a{width:100%}
 .hero{padding:62px 0 50px}.section{padding:56px 0}.grid-3,.grid-2{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr}.footer-grid>div:first-child{grid-column:1/-1}
 h1{font-size:2.55rem}.lead{font-size:1rem}.cta{padding:30px 22px}.prose{padding:23px 18px}.chat-shell{padding:25px 0 45px}.chat-layout{min-height:0}.chat-panel{min-height:610px}.composer{position:sticky;bottom:0;background:#fff}.msg{max-width:88%}
}
@media(max-width:450px){.footer-grid{grid-template-columns:1fr}.footer-grid>div:first-child{grid-column:auto}.footer-bottom{display:block}.footer-bottom span{display:block;margin-top:6px}}