:root{
  --bg:#F3F5F7; --ink:#16222E; --mut:#5C6B78; --line:#DDE3E8; --panel:#FFFFFF;
  --blue:#3D8FEF; --bluedark:#2C79D4; --bluepale:#E3F1FB; --blueink:#1E5FA8;
  --cardpaper:#FFFFFF; --cardink:#1B1B1F; --cardmut:#6B7683; --cardline:#E6E9ED;
  --good:#1D7A4C; --goodpale:#E4F5EB; --warn:#8A5A00; --warnpale:#FFF4DC;
}
*{box-sizing:border-box;margin:0}
html{color-scheme:light}
body{background:var(--bg);color:var(--ink);font-family:'Figtree',system-ui,sans-serif;line-height:1.55;-webkit-font-smoothing:antialiased}
a{color:var(--blueink)}
.wrap{max-width:1040px;margin:0 auto;padding:28px 16px 56px}
.topbar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px;margin-bottom:18px}
.topbar .brand{font-family:'Poppins',sans-serif;font-weight:600;font-size:15px}
.topbar nav a{font-size:13px;margin-left:14px;text-decoration:none;color:var(--mut)}
.topbar nav a[aria-current]{color:var(--ink);font-weight:600}
.demo-tag{font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--warn);background:var(--warnpale);border-radius:999px;padding:4px 10px}

/* the page itself: phone-width card, centered */
.stage{display:grid;grid-template-columns:minmax(0,440px) minmax(0,1fr);gap:28px;align-items:start}
@media (max-width:860px){.stage{grid-template-columns:1fr}}
.page{background:var(--cardpaper);color:var(--cardink);border-radius:18px;border:1px solid var(--cardline);
  box-shadow:0 18px 44px rgba(20,33,46,.13);overflow:hidden;width:min(440px,100%)}
.screen{display:none}
.screen[data-active]{display:block}
.strip{background:var(--bluepale);color:#1B1B1F;text-align:center;font-size:11.5px;font-weight:600;padding:7px 12px}
.head-row{display:flex;justify-content:space-between;align-items:center;padding:14px 26px 0}
.logo{display:flex;align-items:center;gap:7px;color:#1B1B1F;text-decoration:none}
.logo .lw{font-family:'Poppins',sans-serif;font-weight:700;font-size:10.5px;line-height:1.15;letter-spacing:.1em}
.head-note{font-size:11.5px;color:var(--cardmut)}
.body{padding:18px 26px 22px}
h1.head{font-family:'Poppins',sans-serif;font-size:23px;font-weight:600;line-height:1.28;letter-spacing:-.01em;color:#1B1B1F;text-wrap:balance;margin-bottom:8px}
.hero{display:flex;align-items:center;gap:14px;margin:4px 0 12px}
.hero .amt{font-family:'Poppins',sans-serif;font-weight:700;font-size:44px;line-height:1;color:var(--blue);letter-spacing:-.03em}
.hero .amt small{font-size:14px;letter-spacing:0;color:var(--cardmut);display:block;font-weight:600;margin-top:4px}
.sub{font-size:13.5px;color:var(--cardmut);margin-bottom:14px}
.sub b{color:#1B1B1F;font-weight:600}
.perkline{font-size:13.5px;color:#1B1B1F;margin-bottom:6px;display:flex;gap:9px;align-items:flex-start}
.perkline .tick{flex:none;width:17px;height:17px;border-radius:50%;background:var(--bluepale);color:var(--blueink);display:grid;place-items:center;font-size:10px;font-weight:700;margin-top:2px}
.perkline b{font-weight:600}
.perkgroup{margin-bottom:16px}
label.lab{display:block;font-size:12px;color:var(--cardmut);margin:0 0 4px 2px}
.input{width:100%;border:1px solid #D7DCE1;border-radius:10px;padding:12px 14px;font:14px 'Figtree',sans-serif;color:#1B1B1F;background:#FFF;margin-bottom:10px}
.input:focus{outline:2px solid var(--blue);border-color:var(--blue)}
.fine{font-size:12px;color:var(--cardmut);margin-bottom:12px}
.cta{display:block;width:100%;border:0;border-radius:999px;background:var(--blue);color:#FFF;font:600 15px 'Figtree',sans-serif;padding:13px 18px;cursor:pointer;letter-spacing:.01em}
.cta:hover{background:var(--bluedark)}
.cta[disabled]{opacity:.55;cursor:default}
.err{margin-top:8px;font-size:12.5px;color:#B3261E;display:none}
.signin{margin-top:10px;font-size:12px;color:var(--cardmut);text-align:center}
.legal{margin-top:6px;font-size:11px;color:var(--cardmut);text-align:center}
.featured{margin-top:14px;text-align:center}
.featured .cap{font-size:9.5px;letter-spacing:.14em;color:#A6AEB7;font-weight:600;margin-bottom:6px}
.featured .logos{font-family:'Poppins',sans-serif;font-size:11px;font-weight:600;color:#B4BBC3;letter-spacing:.02em}
.secure{display:flex;gap:9px;align-items:center;background:var(--bluepale);color:var(--blueink);border-radius:10px;padding:9px 13px;font-size:12.5px;margin-bottom:14px}
.secure .i{flex:none;width:17px;height:17px;border-radius:50%;background:var(--blueink);color:#FFF;display:grid;place-items:center;font-size:10px;font-weight:700}
.emailpill{display:inline-flex;align-items:center;gap:8px;background:#F3F5F7;border-radius:999px;padding:6px 12px;font-size:12.5px;color:#1B1B1F;margin-bottom:12px}
.emailpill a{font-size:11.5px}
#stripe-mount{min-height:220px;border:1px dashed #C9D1D9;border-radius:12px;padding:14px;margin-bottom:12px;background:#FBFCFD}
.mockform .row{display:flex;gap:10px}
.mockform .row .input{flex:1}
.mockform .input{color:#9AA3AD}
.mocknote{font-size:11.5px;color:var(--warn);background:var(--warnpale);border-radius:8px;padding:7px 10px;margin-bottom:10px}
.done{text-align:center;padding:10px 0}
.done .big{font-size:44px;margin-bottom:8px}
.done p{font-size:13.5px;color:var(--cardmut);margin-bottom:10px}
.done .next{background:var(--goodpale);color:var(--good);border-radius:10px;padding:10px 12px;font-size:12.5px;text-align:left}

/* build notes: what we call, live */
.notes{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:16px 18px;font-size:13px;color:var(--mut);position:sticky;top:16px}
.notes h2{font-family:'Poppins',sans-serif;font-size:14px;font-weight:600;color:var(--ink);margin-bottom:6px}
.notes .steps{list-style:none;padding:0;margin:10px 0 0}
.notes .steps li{padding:9px 0;border-top:1px solid var(--line)}
.notes .steps li:first-child{border-top:0}
.notes .who{font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;font-weight:700;margin-bottom:3px}
.notes .who.ours{color:var(--blueink)}
.notes .who.dfc{color:var(--good)}
.notes .who.stripe{color:#635BFF}
.notes b{color:var(--ink);font-weight:600}
.notes code,.notes pre{font-family:ui-monospace,'SF Mono',Menlo,monospace;font-size:11px;color:var(--ink)}
.notes pre{background:#F3F5F7;border-radius:8px;padding:8px 10px;overflow:auto;white-space:pre-wrap;word-break:break-word;margin-top:6px;display:none}
.notes li[data-state="done"] pre{display:block}
.notes li[data-state="done"] .who::after{content:" ✓";color:var(--good)}
.notes li[data-state="active"] .who::after{content:" …"}
.notes .mockflag{font-size:11px;color:var(--warn);margin-top:10px}

/* spec + index */
.doc{max-width:760px}
.doc h1{font-family:'Poppins',sans-serif;font-size:24px;font-weight:600;margin-bottom:6px}
.doc h2{font-family:'Poppins',sans-serif;font-size:16px;font-weight:600;margin:28px 0 8px}
.doc p,.doc li{font-size:14px;color:var(--ink)}
.doc p.lead{font-size:15px;color:var(--mut);max-width:62ch}
.doc ul,.doc ol{padding-left:20px;margin:6px 0 10px}
.doc li{margin:4px 0}
.doc pre{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:12px 14px;font-family:ui-monospace,'SF Mono',Menlo,monospace;font-size:12px;overflow:auto;margin:8px 0 14px}
.doc .card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:16px 18px;margin:10px 0}
.doc .card h3{font-family:'Poppins',sans-serif;font-size:14px;font-weight:600;margin-bottom:6px}
.doc .ask{background:var(--warnpale);border-radius:10px;padding:10px 14px;font-size:13.5px;margin:8px 0}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px;margin:14px 0}
.tile{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:16px 18px;text-decoration:none;color:var(--ink)}
.tile h3{font-family:'Poppins',sans-serif;font-size:15px;font-weight:600;margin-bottom:4px}
.tile p{font-size:13px;color:var(--mut)}
.seq{display:grid;grid-template-columns:120px 1fr;gap:6px 14px;font-size:13px;margin:10px 0 16px}
.seq .k{font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;font-weight:700;padding-top:3px}
.seq .ours{color:var(--blueink)}.seq .dfc{color:var(--good)}.seq .stripe{color:#635BFF}.seq .user{color:var(--mut)}

/* mock of Stripe's embedded checkout (what mounts in #stripe-mount for real) */
.sform{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;color:#30313D}
.s-summary{margin:4px 0 14px}
.s-plan{font-size:13px;color:#6A7383}
.s-trial{font-size:26px;font-weight:600;color:#30313D;letter-spacing:-.01em;margin-top:2px}
.s-then{font-size:13px;color:#6A7383}
.s-section{font-size:13px;font-weight:600;color:#30313D;margin:12px 0 6px}
.s-field{position:relative;border:1px solid #E0E6EB;border-radius:6px;background:#FFF;padding:7px 10px;margin-bottom:8px;min-height:40px;box-shadow:0 1px 1px rgba(0,0,0,.03)}
.s-label{display:block;font-size:11px;color:#6A7383;margin-bottom:1px}
.s-val{font-size:14px;color:#30313D}
.s-ph{color:#9AA3AD}
.s-locked{background:#F6F8FA}
.s-row{display:flex;gap:8px}
.s-row .s-field{flex:1}
.s-brands{position:absolute;right:10px;top:12px;display:flex;gap:3px}
.s-brands i{font-style:normal;font-size:8px;font-weight:700;border:1px solid #E0E6EB;border-radius:3px;padding:1px 4px;color:#6A7383}
.s-tabs{display:flex;gap:6px;margin-bottom:8px}
.s-tab{flex:1;text-align:center;border:1px solid #E0E6EB;border-radius:6px;padding:8px 0;font-size:12.5px;color:#30313D;background:#FFF}
.s-tab.s-on{border-color:var(--blue);color:var(--blue);box-shadow:0 0 0 1px var(--blue) inset}
.s-check{display:flex;gap:8px;align-items:center;font-size:12.5px;color:#30313D;margin:4px 0 12px}
.s-btn{display:block;width:100%;border:0;border-radius:6px;background:var(--blue);color:#FFF;font:600 15px -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;padding:12px;cursor:pointer}
.s-terms{font-size:11.5px;color:#6A7383;margin-top:10px;line-height:1.45}
.s-powered{font-size:11px;color:#9AA3AD;text-align:center;margin-top:10px}