:root{--bg:#F4F7FC;--bg2:#EAF0FA;--surface:#FFFFFF;--text:#0B1220;--muted:#4B5A73;--line:#D5DEEE;--accent:#2757C9;--accent-ink:#FFFFFF;--soft:#E6EDFB;--chip-a:#3F66D4;--chip-b:#6B57D1;--bubble:#DCE6FA;--max:1120px;--r:12px;--r-lg:18px}
@media (prefers-color-scheme:dark){:root{--bg:#0B1220;--bg2:#0F1829;--surface:#131C2E;--text:#E8EEFB;--muted:#9AA9C4;--line:#243049;--accent:#8DB4FF;--accent-ink:#0B1220;--soft:#172640;--chip-a:#4A6FD1;--chip-b:#7B5CD6;--bubble:#1B2840}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.65 Inter,"Segoe UI",system-ui,-apple-system,Roboto,"Helvetica Neue",Arial,sans-serif}
a{color:var(--accent);text-underline-offset:3px}
a:focus-visible{outline:3px solid var(--accent);outline-offset:3px;border-radius:6px}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}
.mono{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
/* top bar */
header.top{position:sticky;top:0;z-index:20;background:var(--bg);border-bottom:1px solid var(--line)}
header.top .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:60px;flex-wrap:wrap;padding-top:6px;padding-bottom:6px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.1rem;letter-spacing:-.01em;color:var(--text);text-decoration:none}
.brand svg{width:26px;height:26px;display:block}
nav.main{display:flex;gap:6px;align-items:center;flex-wrap:wrap}
nav.main a{color:var(--muted);text-decoration:none;font-size:.9rem;padding:6px 10px;border-radius:8px}
nav.main a:hover{color:var(--text);background:var(--soft)}
nav.main a.lang{border:1px solid var(--line);color:var(--text);margin-left:6px}
/* hero */
.hero{padding:80px 0 72px;background:radial-gradient(1100px 420px at 78% -10%,var(--soft),transparent 70%)}
.hero .grid{display:grid;grid-template-columns:1.08fr .92fr;gap:56px;align-items:center}
.kicker{font:600 .75rem/1 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);margin:0 0 18px}
h1{font-size:clamp(2.4rem,5.4vw,4rem);line-height:1.04;letter-spacing:-.035em;font-weight:700;margin:0 0 22px;text-wrap:balance}
h1 em{font:italic 500 1.04em Georgia,"Times New Roman",serif;letter-spacing:-.02em;color:var(--accent)}
.lead{font-size:1.15rem;color:var(--muted);max-width:33em;margin:0 0 28px}
.cta{display:flex;gap:12px;flex-wrap:wrap;margin:0 0 22px}
.btn{display:inline-block;border-radius:10px;padding:11px 20px;font-weight:600;font-size:.95rem;text-decoration:none;border:1px solid var(--line);color:var(--text);background:var(--surface)}
.btn.primary{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}
.btn:hover{filter:brightness(1.06)}
.status{display:inline-flex;align-items:center;gap:10px;font-size:.88rem;color:var(--muted);margin:0}
.status i{width:8px;height:8px;border-radius:50%;background:var(--accent);display:inline-block;box-shadow:0 0 0 4px var(--soft)}
/* phone mock */
.phone{background:var(--bg2);border:1px solid var(--line);border-radius:28px;padding:16px;max-width:380px;margin-left:auto;box-shadow:0 30px 60px -30px rgba(11,18,32,.45)}
.phone .bar{display:flex;align-items:center;justify-content:space-between;padding:2px 6px 12px;color:var(--text);font-weight:600}
.phone .bar span.dot{width:26px;height:26px;border-radius:50%;background:var(--soft);color:var(--accent);display:grid;place-items:center;font-size:.8rem}
.bub{background:var(--bubble);border-radius:16px;padding:12px 14px;margin:0 0 10px;font-size:.93rem}
.tool{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:.85rem;margin:6px 4px 10px}
.tool b{width:8px;height:8px;border-radius:2px;background:var(--accent);display:inline-block}
.reply{font-size:.93rem;margin:0 4px 12px}
.appr{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:14px;margin:0 0 12px}
.appr .t{font-weight:600;font-size:.93rem;margin:0 0 2px}
.appr .d{color:var(--muted);font-size:.84rem;margin:0 0 12px}
.appr .row{display:flex;gap:8px;flex-wrap:wrap}
.pill{border-radius:999px;padding:6px 14px;font-size:.82rem;font-weight:600;border:1px solid var(--line)}
.pill.primary{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}
.composer{display:flex;align-items:center;gap:8px;background:var(--surface);border:1px solid var(--line);border-radius:22px;padding:8px 10px}
.composer .plus{width:30px;height:30px;border-radius:50%;background:var(--soft);display:grid;place-items:center;color:var(--accent);font-weight:700}
.composer .chip{flex:1;text-align:center;border-radius:999px;padding:7px 12px;font-size:.82rem;font-weight:600;color:#fff;background:linear-gradient(90deg,var(--chip-a),var(--chip-b))}
.composer .send{width:30px;height:30px;border-radius:50%;background:var(--accent);color:var(--accent-ink);display:grid;place-items:center;font-weight:700}
.mocknote{text-align:right;color:var(--muted);font-size:.78rem;margin:10px 4px 0}
/* sections */
section.block{padding:72px 0;border-top:1px solid var(--line)}
section.block.alt{background:var(--bg2)}
.head{max-width:44rem;margin:0 0 36px}
.head h2{font-size:clamp(1.7rem,3.2vw,2.3rem);line-height:1.12;letter-spacing:-.025em;margin:0 0 10px;text-wrap:balance}
.head p{color:var(--muted);margin:0}
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.feature{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:22px}
.feature .k{font:600 .7rem/1 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);margin:0 0 12px}
.feature h3{margin:0 0 6px;font-size:1.08rem;letter-spacing:-.01em}
.feature p{margin:0;color:var(--muted);font-size:.94rem}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;counter-reset:s}
.step{border:1px solid var(--line);border-radius:var(--r);padding:22px;background:var(--surface);position:relative}
.step::before{counter-increment:s;content:"0" counter(s);font:600 .8rem/1 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;color:var(--accent);display:block;margin:0 0 12px}
.step h3{margin:0 0 6px;font-size:1.05rem}
.step p{margin:0;color:var(--muted);font-size:.94rem}
.two{display:grid;grid-template-columns:.9fr 1.1fr;gap:56px;align-items:start}
.privacy-points{margin:0;padding:0;list-style:none;display:grid;gap:14px}
.privacy-points li{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:16px 18px;color:var(--muted)}
.privacy-points strong{color:var(--text)}
.more{display:inline-block;margin-top:18px;font-weight:600}
.band{display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);padding:28px}
.band h2{margin:0 0 4px;font-size:1.4rem;letter-spacing:-.02em}
.band p{margin:0;color:var(--muted)}
/* docs */
main.doc{padding:56px 0 80px}
main.doc .wrap{max-width:780px}
main.doc h1{font-size:clamp(2rem,4vw,2.7rem);letter-spacing:-.03em}
main.doc h2{font-size:1.3rem;margin:36px 0 8px;letter-spacing:-.01em}
main.doc .meta{color:var(--muted);margin:0 0 28px}
main.doc ul{padding-left:1.2em}
main.doc li{margin:4px 0}
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r);background:var(--surface);margin:12px 0}
table{border-collapse:collapse;width:100%;min-width:520px;font-size:.95rem}
th,td{text-align:left;padding:10px 14px;border-bottom:1px solid var(--line);vertical-align:top}
tr:last-child td{border-bottom:0}
th{color:var(--muted);font-weight:600;font-size:.85rem}
code{font:.9em ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;background:var(--soft);padding:1px 6px;border-radius:6px;word-break:break-all}
.callout{background:var(--soft);border:1px solid var(--line);border-radius:var(--r);padding:14px 16px;margin:18px 0}
/* footer */
footer.foot{border-top:1px solid var(--line);padding:36px 0 52px;color:var(--muted);font-size:.9rem;background:var(--bg)}
footer.foot .links{display:flex;gap:20px;flex-wrap:wrap;margin-bottom:14px}
footer.foot a{color:var(--muted)}
footer.foot a:hover{color:var(--text)}
footer.foot p{margin:6px 0;max-width:60em}
@media (max-width:900px){.hero{padding:48px 0 44px}.hero .grid,.two{grid-template-columns:1fr;gap:36px}.phone{margin:0 auto}.features,.steps{grid-template-columns:1fr}section.block{padding:52px 0}}
.works{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.chipcard{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:16px 18px}
.chipcard .k{font:600 .68rem/1 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);margin:0 0 10px}
.chipcard h3{margin:0 0 4px;font-size:1rem}
.chipcard p{margin:0;color:var(--muted);font-size:.9rem}
.asks{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.ask{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:18px 20px}
.ask .k{font:600 .68rem/1 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);margin:0 0 10px}
.ask .q{margin:0;font-size:1rem;line-height:1.5}
@media (max-width:900px){.works{grid-template-columns:repeat(2,1fr)}.asks{grid-template-columns:1fr}}
@media (max-width:480px){.works{grid-template-columns:1fr}}