:root{--p:#2563eb;--p2:#1d4ed8;--pl:#dbeafe;--ink:#0f172a;--mut:#475569;--line:#e2e8f0;--bg:#ffffff;--bg2:#f8fafc;--ok:#16a34a;--err:#dc2626;--r:14px;--sh:0 10px 30px rgba(15,23,42,.08)}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--ink);background:var(--bg);line-height:1.55;-webkit-font-smoothing:antialiased}
a{color:var(--p);text-decoration:none}a:hover{text-decoration:underline}
h1,h2,h3{line-height:1.2;margin:0 0 .5em;letter-spacing:-.02em}h1{font-size:clamp(2rem,5vw,3.4rem);font-weight:800}h2{font-size:clamp(1.5rem,3vw,2.2rem);font-weight:750}h3{font-size:1.15rem;font-weight:700}
p{margin:0 0 1em}.muted{color:var(--mut)}.small{font-size:.9rem}.center{text-align:center}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}.narrow{max-width:760px}
.nav{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 20px;max-width:1120px;margin:0 auto}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.25rem;color:var(--ink)}.brand img{width:32px;height:32px}.brand:hover{text-decoration:none}
.nav nav{display:flex;align-items:center;gap:18px;flex-wrap:wrap}.nav nav a{color:var(--ink);font-weight:500}.nav form{margin:0}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 20px;border-radius:10px;border:1px solid var(--p);background:var(--p);color:#fff;font-weight:600;cursor:pointer;font-size:1rem;font-family:inherit;transition:.15s}
.btn:hover{background:var(--p2);text-decoration:none}.btn.lg{padding:15px 28px;font-size:1.08rem}.btn.sm{padding:7px 14px;font-size:.9rem}
.btn.ghost{background:transparent;color:var(--p)}.btn.ghost:hover{background:var(--pl)}.btn.white{background:#fff;color:var(--p);border-color:#fff}.btn.danger{background:#fff;color:var(--err);border-color:var(--err)}.btn.danger:hover{background:#fef2f2}
.btn.link{background:none;border:none;color:var(--mut);padding:0;font-weight:500}.btn.link:hover{color:var(--ink);text-decoration:underline}
.hero{padding:72px 0 40px;text-align:center}.hero p.lead{font-size:1.25rem;color:var(--mut);max-width:700px;margin:0 auto 28px}
.hero .cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}.badge{display:inline-block;background:var(--pl);color:var(--p2);font-weight:600;font-size:.85rem;padding:5px 12px;border-radius:999px;margin-bottom:18px}
.section{padding:56px 0}.section.alt{background:var(--bg2)}.section h2{text-align:center;margin-bottom:8px}.section .sub{text-align:center;color:var(--mut);max-width:640px;margin:0 auto 36px}
.grid{display:grid;gap:20px;grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:24px;box-shadow:0 1px 2px rgba(15,23,42,.04)}.card h3{margin-top:0}
.step{position:relative;padding-left:56px}.step .n{position:absolute;left:0;top:0;width:40px;height:40px;border-radius:50%;background:var(--p);color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center}
.code{background:#0f172a;color:#e2e8f0;border-radius:10px;padding:14px 16px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.85rem;overflow-x:auto;white-space:pre-wrap;word-break:break-all}
.pricing{display:grid;gap:20px;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));align-items:stretch}.plan{display:flex;flex-direction:column}.plan.hl{border-color:var(--p);box-shadow:var(--sh)}
.plan .price{font-size:2.4rem;font-weight:800;margin:6px 0}.plan .price span{font-size:1rem;font-weight:500;color:var(--mut)}.plan ul{list-style:none;padding:0;margin:14px 0 22px;flex:1}.plan li{padding:6px 0;border-bottom:1px dashed var(--line)}.plan li::before{content:"\2713  ";color:var(--ok);font-weight:700}
.faq details{border-bottom:1px solid var(--line);padding:14px 0}.faq summary{font-weight:600;cursor:pointer}
.chatdemo{max-width:520px;margin:0 auto;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;box-shadow:var(--sh);background:#fff}.chatdemo .hd{background:var(--p);color:#fff;padding:12px 16px;font-weight:600}.chatdemo .msgs{padding:16px;display:flex;flex-direction:column;gap:10px;background:var(--bg2)}
.bub{max-width:82%;padding:10px 14px;border-radius:14px;font-size:.95rem}.bub.u{align-self:flex-end;background:var(--p);color:#fff;border-bottom-right-radius:4px}.bub.a{align-self:flex-start;background:#fff;border:1px solid var(--line);border-bottom-left-radius:4px}
footer{border-top:1px solid var(--line);padding:32px 20px;color:var(--mut);font-size:.9rem}footer .wrap{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}footer a{color:var(--mut);margin-right:16px}
/* forms */
form.stack{display:flex;flex-direction:column;gap:14px}label{font-weight:600;font-size:.92rem;display:block;margin-bottom:6px}
input[type=text],input[type=email],input[type=password],input[type=url],textarea,select{width:100%;padding:11px 13px;border:1px solid #cbd5e1;border-radius:10px;font:inherit;background:#fff;color:var(--ink)}input:focus,textarea:focus,select:focus{outline:2px solid var(--pl);border-color:var(--p)}
textarea{min-height:110px;resize:vertical}.help{font-size:.85rem;color:var(--mut);margin-top:4px}.row{display:flex;gap:12px;flex-wrap:wrap}.row>*{flex:1;min-width:180px}
.authbox{max-width:440px;margin:56px auto;padding:32px}.flash{padding:12px 16px;border-radius:10px;margin:0 0 16px;font-weight:500}.flash.ok{background:#dcfce7;color:#166534}.flash.err{background:#fee2e2;color:#991b1b}
/* app */
.app{display:grid;grid-template-columns:230px 1fr;min-height:calc(100vh - 70px)}.side{border-right:1px solid var(--line);padding:22px 16px;background:var(--bg2)}.side a{display:block;padding:9px 12px;border-radius:9px;color:var(--ink);font-weight:500}.side a.on,.side a:hover{background:var(--pl);color:var(--p2);text-decoration:none}
.main{padding:28px 32px;max-width:1100px}.pagehead{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;margin-bottom:22px}.pagehead h1{font-size:1.7rem;margin:0}
.tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);margin-bottom:22px;flex-wrap:wrap}.tabs a{padding:10px 14px;color:var(--mut);font-weight:600;border-bottom:2px solid transparent;margin-bottom:-1px}.tabs a.on{color:var(--p);border-color:var(--p)}.tabs a:hover{text-decoration:none;color:var(--p)}
table{width:100%;border-collapse:collapse}th,td{text-align:left;padding:10px 8px;border-bottom:1px solid var(--line);vertical-align:top;font-size:.93rem}th{color:var(--mut);font-weight:600;font-size:.82rem;text-transform:uppercase;letter-spacing:.04em}
.pill{display:inline-block;padding:3px 10px;border-radius:999px;font-size:.78rem;font-weight:700}.pill.ready{background:#dcfce7;color:#166534}.pill.pending,.pill.indexing{background:#fef9c3;color:#854d0e}.pill.error{background:#fee2e2;color:#991b1b}
.stats{display:grid;gap:14px;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));margin-bottom:22px}.stat{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 16px}.stat b{display:block;font-size:1.5rem}.stat span{color:var(--mut);font-size:.85rem}
.play{border:1px solid var(--line);border-radius:var(--r);overflow:hidden;height:560px;max-width:520px}.play iframe{width:100%;height:100%;border:0}
.convlist{display:grid;grid-template-columns:300px 1fr;gap:18px}.convlist .list a{display:block;padding:10px 12px;border:1px solid var(--line);border-radius:10px;margin-bottom:8px;color:var(--ink);font-size:.9rem}.convlist .list a:hover{background:var(--bg2);text-decoration:none}
.empty{padding:40px;text-align:center;color:var(--mut);border:2px dashed var(--line);border-radius:var(--r)}
@media(max-width:820px){.app{grid-template-columns:1fr}.side{display:flex;gap:6px;overflow-x:auto;border-right:0;border-bottom:1px solid var(--line);padding:10px}.side a{white-space:nowrap}.main{padding:20px 16px}.convlist{grid-template-columns:1fr}.hero{padding:48px 0 32px}}