:root{--ink:#0b1220;--navy:#101a30;--navy2:#17233f;--gold:#f5b942;--gold2:#ffd27a;--teal:#2dd4bf;--bg:#f6f7fb;--card:#fff;--text:#16203a;--muted:#5b6784;--line:#e2e6f0;--r:16px;color-scheme:light}
*{box-sizing:border-box;margin:0}html{scroll-behavior:smooth}
body{font-family:Inter,"Segoe UI",system-ui,-apple-system,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;padding-top:env(safe-area-inset-top,0)}
a{color:inherit;text-decoration:none}.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
:focus-visible{outline:3px solid var(--gold);outline-offset:2px}
/* navbar */
.nav{position:sticky;top:0;z-index:50;background:rgba(11,18,32,.92);backdrop-filter:blur(10px);border-bottom:1px solid rgba(255,255,255,.08)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:66px}
.brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:800;letter-spacing:-.01em}
.logo{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--gold),#e8912d);display:grid;place-items:center;color:var(--ink);font-weight:900}
.links{display:flex;gap:6px}.links a{color:#c9d2e8;padding:8px 14px;border-radius:10px;font-weight:600;font-size:.95rem;transition:.2s}
.links a:hover{color:#fff;background:rgba(255,255,255,.08)}.links a.on{color:var(--ink);background:var(--gold)}
.burger{display:none;background:none;border:1px solid rgba(255,255,255,.25);color:#fff;border-radius:10px;padding:7px 12px;font-size:1.1rem;cursor:pointer}
@media(max-width:820px){.burger{display:block}.links{display:none;position:absolute;top:66px;left:0;right:0;flex-direction:column;background:var(--ink);padding:12px 20px 18px}.links.open{display:flex}}
/* hero */
.hero{background:radial-gradient(900px 400px at 85% -10%,rgba(245,185,66,.22),transparent),radial-gradient(700px 400px at 0% 100%,rgba(45,212,191,.16),transparent),linear-gradient(180deg,var(--ink),var(--navy2));color:#fff;padding:84px 0 96px}
.pill{display:inline-block;border:1px solid rgba(245,185,66,.5);color:var(--gold2);padding:6px 14px;border-radius:99px;font-size:.85rem;font-weight:600;margin-bottom:20px}
.hero h1{font-size:clamp(2.2rem,5.4vw,3.9rem);line-height:1.08;letter-spacing:-.03em;max-width:780px}
.hero h1 span{background:linear-gradient(90deg,var(--gold),var(--teal));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{color:#b9c4de;font-size:1.15rem;max-width:620px;margin:20px 0 30px}
.btns{display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 24px;border-radius:12px;font-weight:700;border:1px solid transparent;transition:.2s;cursor:pointer;font-size:1rem}
.btn.gold{background:var(--gold);color:var(--ink)}.btn.gold:hover{background:var(--gold2);transform:translateY(-2px)}
.btn.ghost{border-color:rgba(255,255,255,.3);color:#fff}.btn.ghost:hover{background:rgba(255,255,255,.1)}
/* stats */
.stats{margin-top:-46px;position:relative}.stats .wrap>div{background:var(--card);border-radius:20px;box-shadow:0 20px 50px rgba(11,18,32,.14);display:grid;grid-template-columns:repeat(4,1fr);padding:26px}
.stat{text-align:center;padding:6px}.stat b{display:block;font-size:2.1rem;letter-spacing:-.02em;color:var(--ink)}.stat span{color:var(--muted);font-size:.92rem}
@media(max-width:700px){.stats .wrap>div{grid-template-columns:repeat(2,1fr);gap:14px}}
/* sections */
section.s{padding:84px 0 0}.eyebrow{color:#b9791a;font-weight:700;font-size:.85rem;letter-spacing:.12em;text-transform:uppercase}
h2{font-size:clamp(1.7rem,3.4vw,2.4rem);letter-spacing:-.02em;margin:8px 0 12px}.lead{color:var(--muted);max-width:620px}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:36px}@media(max-width:900px){.grid{grid-template-columns:1fr 1fr}}@media(max-width:600px){.grid{grid-template-columns:1fr}}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:26px;transition:.25s}
.card:hover{transform:translateY(-4px);box-shadow:0 18px 40px rgba(11,18,32,.1);border-color:var(--gold)}
.ico{width:46px;height:46px;border-radius:13px;background:linear-gradient(135deg,#fff3d6,#ffe2a1);display:grid;place-items:center;font-size:1.4rem;margin-bottom:16px}
.card h3{font-size:1.1rem;margin-bottom:6px}.card p{color:var(--muted);font-size:.95rem}
.steps{counter-reset:s}.steps .card{position:relative;padding-top:44px}.steps .card::before{counter-increment:s;content:counter(s);position:absolute;top:-18px;left:24px;width:38px;height:38px;border-radius:50%;background:var(--ink);color:var(--gold);display:grid;place-items:center;font-weight:800}
.cta{margin:90px 0;background:linear-gradient(135deg,var(--ink),var(--navy2));color:#fff;border-radius:26px;padding:56px 32px;text-align:center}
.cta h2{margin-top:0}.cta p{color:#b9c4de;margin:0 auto 26px;max-width:520px}
/* footer */
footer.ft{background:var(--ink);color:#aab6d3;padding:50px 0 28px}.fg{display:grid;grid-template-columns:2fr 1fr 1fr;gap:30px}@media(max-width:700px){.fg{grid-template-columns:1fr}}
footer h4{color:#fff;margin-bottom:10px}footer a{display:block;padding:3px 0}footer a:hover{color:var(--gold)}.copy{border-top:1px solid rgba(255,255,255,.1);margin-top:30px;padding-top:18px;font-size:.88rem}
/* page header, library */
.phead{background:linear-gradient(180deg,var(--ink),var(--navy2));color:#fff;padding:54px 0 70px}.phead h1{font-size:clamp(2rem,4.4vw,3rem);letter-spacing:-.03em}.phead p{color:#b9c4de;margin-top:8px;max-width:600px}
.tools{margin-top:-34px;position:relative}.tools .box{background:var(--card);border-radius:18px;box-shadow:0 16px 40px rgba(11,18,32,.12);padding:18px}
.search{width:100%;padding:15px 18px;font-size:1.05rem;border:2px solid var(--line);border-radius:12px;background:#fff;color:var(--text)}.search:focus{border-color:var(--gold);outline:none}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}.chip{padding:8px 16px;border-radius:99px;border:1px solid var(--line);background:#fff;font-weight:600;font-size:.92rem;cursor:pointer;color:var(--text);transition:.2s}
.chip:hover{border-color:var(--gold)}.chip.on{background:var(--ink);color:var(--gold);border-color:var(--ink)}
.count{color:var(--muted);margin:26px 0 4px;font-weight:600}
.tg{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:14px 0 80px}@media(max-width:900px){.tg{grid-template-columns:1fr 1fr}}@media(max-width:600px){.tg{grid-template-columns:1fr}}
.tcard{display:block;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px;transition:.25s;border-left:5px solid var(--c,var(--gold))}
.tcard:hover{transform:translateY(-3px);box-shadow:0 14px 32px rgba(11,18,32,.1)}.tcard small{color:var(--muted);font-weight:700;letter-spacing:.06em;font-size:.75rem}
.tcard h3{font-size:1.02rem;margin:4px 0 8px;line-height:1.3}.tcard .m{display:flex;gap:6px;flex-wrap:wrap;color:var(--muted);font-size:.82rem}.tcard .m span{background:#f1f3f9;padding:3px 9px;border-radius:99px}
.empty{padding:50px 0;text-align:center;color:var(--muted)}
/* topic page */
.crumb{color:#aab6d3;font-size:.9rem;margin-bottom:12px}.crumb a:hover{color:var(--gold)}.badge{display:inline-block;background:rgba(245,185,66,.18);color:var(--gold2);border:1px solid rgba(245,185,66,.4);padding:4px 12px;border-radius:99px;font-size:.8rem;font-weight:700;margin-bottom:12px}
.tabs{display:flex;gap:6px;background:#e9ecf4;padding:6px;border-radius:14px;margin:-26px 0 22px;position:relative;max-width:420px}.tab{flex:1;border:0;background:none;padding:11px 8px;border-radius:10px;font-weight:700;color:var(--muted);cursor:pointer;font-size:.95rem}.tab.on{background:#fff;color:var(--ink);box-shadow:0 4px 12px rgba(11,18,32,.12)}
.panel{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:26px;min-height:240px}
.pt{display:flex;gap:14px;padding:14px 0;border-bottom:1px solid var(--line)}.pt:last-child{border:0}.pn{flex:none;width:30px;height:30px;border-radius:50%;background:var(--ink);color:var(--gold);display:grid;place-items:center;font-weight:800;font-size:.85rem}
.qn{background:#fff8e8;border-left:4px solid var(--gold);padding:14px 16px;border-radius:10px;margin:10px 0}
.qh{display:flex;justify-content:space-between;color:var(--muted);font-size:.9rem}.bar{height:7px;background:var(--line);border-radius:9px;margin:8px 0 18px;overflow:hidden}.bar i{display:block;height:100%;background:var(--gold)}
.opt{display:block;width:100%;text-align:left;padding:14px 16px;margin:9px 0;background:#fff;border:2px solid var(--line);border-radius:12px;font-size:1rem;cursor:pointer;color:var(--text);transition:.15s}.opt:hover:not(:disabled){border-color:var(--ink)}.opt.ok{border-color:#16a394;background:#e4f7f3}.opt.no{border-color:#e0527a;background:#fde8ee}
.big{font-size:2.4rem;font-weight:800}.nav2{display:flex;justify-content:space-between;gap:12px;margin:26px 0 80px;flex-wrap:wrap}.btn.dark{background:var(--ink);color:#fff}.btn.line{border-color:var(--line);background:#fff}
/* chat */
.fab{position:fixed;right:18px;bottom:calc(18px + env(safe-area-inset-bottom,0px));z-index:60;background:var(--gold);color:var(--ink);font-weight:800;padding:14px 20px;border-radius:99px;box-shadow:0 12px 30px rgba(11,18,32,.3);transition:.2s}.fab:hover{transform:translateY(-3px)}
.chat{background:var(--card);border:1px solid var(--line);border-radius:20px;box-shadow:0 20px 50px rgba(11,18,32,.1);display:flex;flex-direction:column;height:min(640px,calc(100vh - 230px));min-height:420px;margin-top:-30px;position:relative}
.msgs{flex:1;overflow:auto;padding:22px;display:flex;flex-direction:column;gap:14px}.b{max-width:82%;padding:12px 16px;border-radius:16px;line-height:1.55;white-space:pre-wrap;word-wrap:break-word}.b.u{align-self:flex-end;background:var(--ink);color:#fff;border-bottom-right-radius:4px}.b.a{align-self:flex-start;background:#f1f3f9;border-bottom-left-radius:4px}.b a{color:#9a6200;font-weight:700;text-decoration:underline}.src{font-size:.75rem;color:var(--muted);margin-top:6px}
.sug{display:flex;gap:8px;flex-wrap:wrap;padding:0 22px 12px}.cb{display:flex;gap:10px;padding:14px;border-top:1px solid var(--line)}.cb input{flex:1;padding:14px 16px;border:2px solid var(--line);border-radius:12px;font-size:1rem}.cb input:focus{border-color:var(--gold);outline:none}
@media(max-width:600px){.b{max-width:92%}}