:root{
  --bg:#0B1220;
  --bg2:#0F172A;
  --card:#111C33;
  --ink:#0F172A;
  --muted:#94A3B8;
  --light:#F8FAFC;
  --line:#E2E8F0;
  --amber:#F59E0B;
  --amber-d:#D97706;
  --green:#22C55E;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--ink);background:#fff;line-height:1.6;-webkit-font-smoothing:antialiased}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
a{color:inherit}

/* ---------- nav ---------- */
.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:64px}
.brand{font-weight:800;font-size:20px;color:#fff;text-decoration:none;letter-spacing:-.5px}
.brand b{color:var(--amber)}
.nav-links{display:flex;gap:26px;align-items:center}
.nav-links a{color:#CBD5E1;text-decoration:none;font-size:15px}
.nav-links a:hover{color:#fff}
.btn{display:inline-block;background:var(--amber);color:#1a1207;font-weight:700;text-decoration:none;padding:13px 26px;border-radius:10px;border:0;cursor:pointer;font-size:16px;transition:transform .12s ease,background .12s ease}
.btn:hover{background:var(--amber-d);transform:translateY(-1px)}
.btn.ghost{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.35)}
.btn.ghost:hover{border-color:#fff;background:rgba(255,255,255,.06)}
.btn.small{padding:9px 18px;font-size:14px}
.burger{display:none;background:none;border:0;color:#fff;font-size:26px;cursor:pointer}

/* ---------- hero ---------- */
.hero{background:radial-gradient(900px 480px at 70% -10%,rgba(245,158,11,.16),transparent 60%),var(--bg);color:#fff;padding:84px 0 96px}
.hero h1{font-size:clamp(34px,6vw,58px);line-height:1.08;letter-spacing:-1.5px;margin-bottom:18px}
.hero h1 .hl{color:var(--amber)}
.hero .sub{font-size:clamp(17px,2.4vw,21px);color:#CBD5E1;max-width:640px;margin-bottom:32px}
.cta-row{display:flex;gap:14px;flex-wrap:wrap}
.hero-note{margin-top:22px;color:var(--muted);font-size:14px}
.hero-guarantee{margin-top:16px;color:var(--green);font-weight:700;font-size:15px}

/* ---------- flash banner ---------- */
.flash-banner{background:linear-gradient(90deg,#DC2626,#F59E0B);color:#fff;text-align:center;padding:11px 16px;font-size:15px}
.flash-banner a{color:#fff;font-weight:800;text-decoration:underline}
.flash-banner strong{letter-spacing:.5px}

/* ---------- founding 50 ---------- */
#founding50{background:linear-gradient(180deg,#FFFBEB,#fff)}
.f50-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin:34px 0 8px}
.f50-step{background:#fff;border:1px solid var(--line);border-radius:14px;padding:26px 22px;text-align:center}
.f50-num{width:46px;height:46px;border-radius:50%;background:var(--ink);color:#fff;font-weight:800;font-size:20px;display:flex;align-items:center;justify-content:center;margin:0 auto 14px}
.f50-step h3{font-size:18px;margin-bottom:8px}
.f50-step p{color:#475569;font-size:15px}
@media(max-width:720px){.f50-grid{grid-template-columns:1fr}}

/* ---------- sections ---------- */
section{padding:72px 0}
section.alt{background:var(--light)}
.eyebrow{color:var(--amber-d);font-weight:700;text-transform:uppercase;letter-spacing:1.5px;font-size:13px;margin-bottom:12px}
h2{font-size:clamp(26px,4vw,38px);letter-spacing:-.8px;line-height:1.15;margin-bottom:14px}
.lede{color:#475569;font-size:18px;max-width:680px;margin-bottom:36px}

/* problem */
.problem-grid{display:grid;gap:18px;grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.problem-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:28px}
.problem-card .ic{font-size:30px;margin-bottom:12px}
.problem-card h3{margin-bottom:8px;font-size:19px}
.problem-card p{color:#475569}

/* steps */
.steps{display:grid;gap:18px;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));counter-reset:step}
.step{background:#fff;border:1px solid var(--line);border-radius:14px;padding:28px;position:relative}
.step .n{display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;border-radius:50%;background:var(--bg);color:var(--amber);font-weight:800;font-size:20px;margin-bottom:14px}
.step h3{margin-bottom:8px;font-size:19px}
.step p{color:#475569}

/* features */
.feat-grid{display:grid;gap:18px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.feat{background:var(--card);color:#E2E8F0;border-radius:14px;padding:26px;border:1px solid rgba(255,255,255,.07)}
.feat .ic{font-size:28px;margin-bottom:10px}
.feat h3{font-size:17px;margin-bottom:6px;color:#fff}
.feat p{color:#94A3B8;font-size:15px}
.dark-sec{background:var(--bg2);color:#fff}
.dark-sec .lede{color:#94A3B8}

/* chat demo */
.chat-shell{max-width:560px;margin:0 auto;background:#fff;border:1px solid var(--line);border-radius:18px;overflow:hidden;box-shadow:0 20px 60px rgba(11,18,32,.12)}
.chat-head{background:var(--bg);color:#fff;padding:14px 20px;font-weight:700;display:flex;align-items:center;gap:10px}
.chat-head .dot{width:10px;height:10px;border-radius:50%;background:var(--green);box-shadow:0 0 8px var(--green)}
.chat-body{padding:22px 18px;display:flex;flex-direction:column;gap:12px;background:#F1F5F9}
.msg{max-width:82%;padding:12px 16px;border-radius:16px;font-size:15px;line-height:1.5}
.msg.bot{background:#fff;border:1px solid var(--line);align-self:flex-start;border-bottom-left-radius:4px}
.msg.user{background:var(--bg);color:#fff;align-self:flex-end;border-bottom-right-radius:4px}
.msg .tag{display:block;font-size:11px;font-weight:700;letter-spacing:.8px;text-transform:uppercase;margin-bottom:4px;opacity:.6}
.sample-note{text-align:center;color:#64748B;font-size:13px;margin-top:14px}

/* pricing */
.price-grid{display:grid;gap:18px;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));align-items:stretch}
.price-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:32px;display:flex;flex-direction:column}
.price-card.hot{border:2px solid var(--amber);box-shadow:0 16px 44px rgba(245,158,11,.18);position:relative}
.price-card .plan{font-weight:700;text-transform:uppercase;letter-spacing:1px;font-size:13px;color:#64748B;margin-bottom:8px}
.price-card.hot .plan{color:var(--amber-d)}
.price{font-size:44px;font-weight:800;letter-spacing:-1px;margin-bottom:4px}
.price small{font-size:16px;font-weight:500;color:#64748B}
.per{color:#64748B;margin-bottom:20px}
.price-card ul{list-style:none;margin-bottom:28px;flex:1}
.price-card li{padding:8px 0;border-bottom:1px solid #F1F5F9;color:#334155;font-size:15px}
.price-card li:before{content:"✓ ";color:var(--green);font-weight:700}
.fineprint{text-align:center;color:#64748B;margin-top:22px}
.guarantee{max-width:760px;margin:28px auto 0;background:#fff;border:2px solid var(--green);border-radius:16px;padding:26px 30px;display:flex;gap:22px;align-items:center}
.guarantee-badge{flex-shrink:0;width:110px;height:110px;border-radius:50%;background:var(--green);color:#fff;display:flex;align-items:center;justify-content:center;text-align:center;font-size:13px;font-weight:800;line-height:1.35;letter-spacing:.5px}
.guarantee strong{font-size:19px}
.guarantee div:last-child{color:#334155;line-height:1.6}
@media(max-width:560px){.guarantee{flex-direction:column;text-align:center}}

/* faq */
.faq{max-width:760px;margin:0 auto}
.faq-item{border:1px solid var(--line);border-radius:12px;margin-bottom:12px;background:#fff;overflow:hidden}
.faq-q{width:100%;background:none;border:0;text-align:left;padding:20px 22px;font-size:17px;font-weight:700;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:12px;color:var(--ink)}
.faq-q .pm{color:var(--amber-d);font-size:22px;flex-shrink:0}
.faq-a{max-height:0;overflow:hidden;transition:max-height .25s ease}
.faq-a p{padding:0 22px 22px;color:#475569}

/* forms */
.form-card{max-width:640px;margin:0 auto;background:#fff;border:1px solid var(--line);border-radius:18px;padding:36px;box-shadow:0 16px 44px rgba(11,18,32,.08)}
.form-card h2{margin-bottom:8px}
.form-card .lede{margin-bottom:28px}
label{display:block;font-weight:600;font-size:15px;margin:18px 0 6px}
label .req{color:#DC2626}
input,select,textarea{width:100%;padding:13px 14px;border:1px solid #CBD5E1;border-radius:10px;font-size:16px;font-family:inherit;background:#fff;color:var(--ink)}
input:focus,select:focus,textarea:focus{outline:2px solid var(--amber);border-color:var(--amber)}
textarea{min-height:110px;resize:vertical}
.hint{font-size:13px;color:#64748B;margin-top:5px}
.form-ok{display:none;background:#ECFDF5;border:1px solid #A7F3D0;color:#065F46;border-radius:12px;padding:24px;font-size:17px;margin-top:8px}
.form-err{display:none;background:#FEF2F2;border:1px solid #FECACA;color:#991B1B;border-radius:12px;padding:18px;font-size:15px;margin-top:14px}
.radio-row{display:flex;gap:18px;margin-top:6px}
.radio-row label{margin:0;font-weight:500;display:flex;align-items:center;gap:8px}
.radio-row input{width:auto}

/* footer */
footer{background:var(--bg);color:#94A3B8;padding:44px 0;font-size:14px}
footer .wrap{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap}
footer .brand{font-size:18px}

@media (max-width:760px){
  .nav-links{display:none;position:absolute;top:64px;left:0;right:0;background:var(--bg);flex-direction:column;align-items:stretch;padding:12px 20px 20px;gap:4px;border-bottom:1px solid rgba(255,255,255,.08)}
  .nav-links.open{display:flex}
  .nav-links a{padding:12px 0;border-bottom:1px solid rgba(255,255,255,.06)}
  .nav-links .btn{margin-top:10px;text-align:center}
  .burger{display:block}
  section{padding:52px 0}
  .hero{padding:60px 0 70px}
  .form-card{padding:26px 20px}
}