:root{
  --bg:#FAFAF8; --card:#FFFFFF; --ink:#14213C; --muted:#5A6172;
  --line:#E7E7DF; --accent:#1D4B7A; --verify:#0F6E5E; --wash:#F1F3F0;
  --serif:"Source Serif 4",Georgia,serif; --sans:"Inter",system-ui,sans-serif; --mono:"IBM Plex Mono",monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:var(--sans);line-height:1.55;-webkit-font-smoothing:antialiased}
.wrap{max-width:1000px;margin:0 auto;padding:0 24px}
h1,h2,h3{font-family:var(--serif);font-weight:600;line-height:1.11;letter-spacing:-0.01em}
h1{font-size:clamp(2.4rem,5.2vw,3.7rem)}
h2{font-size:clamp(1.55rem,3vw,2.2rem)}
h3{font-size:1.06rem}
a{color:inherit;text-decoration:none}
p{color:var(--muted);font-size:1.07rem}
.eyebrow{font-family:var(--mono);font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--accent)}
.btn{display:inline-block;font-weight:600;font-size:.95rem;padding:13px 24px;border-radius:8px;border:1px solid var(--ink);transition:.15s;cursor:pointer}
.btn.solid{background:var(--ink);color:#fff}.btn.solid:hover{background:var(--accent);border-color:var(--accent)}
nav{position:sticky;top:0;z-index:20;background:rgba(250,250,248,.9);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
nav .wrap{display:flex;align-items:center;gap:28px;height:64px;max-width:1080px}
.logo{font-family:var(--serif);font-weight:600;font-size:1.35rem}
.logo span{color:var(--muted);font-family:var(--sans);font-size:.8rem;font-weight:500}
nav .links{display:flex;gap:24px;margin-left:auto;font-size:.92rem;font-weight:500}
nav .links a{color:var(--muted)}nav .links a:hover{color:var(--ink)}
nav .cta{padding:8px 16px}
@media(max-width:820px){nav .links{display:none}}
header{padding:92px 0 64px}
.hero-grid{display:grid;grid-template-columns:1.06fr .94fr;gap:56px;align-items:center}
@media(max-width:900px){.hero-grid{grid-template-columns:1fr;gap:40px}}
header h1{margin:18px 0 22px}
.sub{font-size:1.18rem;max-width:44ch;color:var(--muted)}
.hero-cta{margin:30px 0 0}
/* receipt visual */
.receipt{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:26px;box-shadow:0 1px 0 rgba(20,33,60,.03);position:relative}
.receipt::before{content:"";position:absolute;top:-1px;left:16px;right:16px;height:6px;background:repeating-linear-gradient(90deg,var(--line) 0 6px,transparent 6px 12px)}
.rlabel{font-family:var(--mono);font-size:.64rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:6px 0 14px}
.row{display:flex;justify-content:space-between;font-family:var(--mono);font-size:.8rem;padding:9px 0;border-bottom:1px dotted #D9DBCF}
.row span:last-child{color:var(--ink);font-weight:500}
.ver{margin-top:14px;font-family:var(--mono);font-size:.72rem;color:var(--verify)}
.ver .ts{color:var(--muted)}
/* stat band */
.band{background:var(--ink);color:#fff}
.band .wrap{padding:48px 24px;max-width:1000px}
.band .stat{font-family:var(--serif);font-size:clamp(1.35rem,2.7vw,1.95rem);font-weight:600;line-height:1.3;max-width:48ch}
.band .stat b{color:#fff}
.band .src{font-family:var(--mono);font-size:.7rem;color:#8FA0BC;margin-top:16px;letter-spacing:.03em}
section{padding:88px 0;border-top:1px solid var(--line)}
.kicker{font-family:var(--mono);font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);margin-bottom:14px}
.lead{font-size:1.13rem;max-width:60ch;margin-top:14px;color:var(--muted)}
.paths{display:grid;grid-template-columns:1fr 1fr;gap:40px;margin-top:34px}
@media(max-width:720px){.paths{grid-template-columns:1fr;gap:30px}}
.path .who{font-family:var(--mono);font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;color:var(--accent);margin-bottom:12px}
.path h3{margin-bottom:10px}
.path p{font-size:1rem}
.gets{display:grid;grid-template-columns:1fr;gap:30px;margin-top:34px;max-width:74ch}
.get{display:grid;grid-template-columns:auto 1fr;gap:20px;align-items:start}
.get .n{font-family:var(--mono);font-size:.8rem;color:var(--accent);padding-top:4px}
.get h3{margin-bottom:6px}
.get p{font-size:1rem}
.get .cite{font-family:var(--mono);font-size:.66rem;color:var(--muted);margin-top:8px}
.get .cite b{color:var(--verify);font-weight:500}
.layer2{display:grid;grid-template-columns:1fr 1fr;gap:40px;margin-top:30px}
@media(max-width:720px){.layer2{grid-template-columns:1fr;gap:26px}}
.layer2 h3{margin-bottom:8px}
.layer2 p{font-size:1rem}
.company p{font-size:1.07rem;max-width:66ch;margin-top:14px}
.trust{border-top:1px solid var(--line);background:var(--wash)}
.trust .wrap{padding:26px 24px;max-width:1080px}
.trust .t1{font-family:var(--mono);font-size:.76rem;color:var(--ink);letter-spacing:.02em}
.trust .t1 b{color:var(--verify);font-weight:500}
.trust .t2{font-family:var(--mono);font-size:.72rem;color:var(--muted);margin-top:8px}
.final{background:var(--ink);color:#fff;border-radius:16px;padding:52px}
.final h2{color:#fff}.final p{color:#C3CCDA;max-width:52ch;margin:14px 0 24px}
.dform{max-width:520px}
.dform input{width:100%;margin-top:12px;padding:13px 15px;border-radius:8px;border:1px solid #33456A;background:#0E1B33;color:#fff;font-family:var(--sans);font-size:.96rem}
.dform input::placeholder{color:#8FA0BC}
.dform input:focus{outline:none;border-color:#fff}
.dform .btn.solid{background:#fff;color:var(--ink);border-color:#fff;margin-top:16px;width:100%}
.dform .hp{position:absolute;left:-9999px;height:0;width:0;opacity:0}
.fmsg{margin-top:12px;font-family:var(--mono);font-size:.8rem;color:#8FA0BC;min-height:1.2em}
.fmsg.ok{color:#7FD1BE}.fmsg.err{color:#E7A3A3}
.nda{font-family:var(--mono);font-size:.7rem;color:#8FA0BC;margin-top:16px}
footer{padding:40px 0;border-top:1px solid var(--line);color:var(--muted);font-size:.85rem}
footer .wrap{display:flex;gap:20px;flex-wrap:wrap;align-items:center;max-width:1080px}
footer .tag{font-family:var(--serif);font-size:1rem;color:var(--ink)}
footer .links{display:flex;gap:16px;margin-left:auto;flex-wrap:wrap}
/* accessibility: skip link, visually-hidden labels, visible focus */
.skip{position:absolute;left:8px;top:-48px;z-index:40;background:var(--ink);color:#fff;padding:10px 16px;border-radius:8px;font-size:.9rem;font-weight:600;transition:top .15s}
.skip:focus{top:8px}
.vh{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
a:focus-visible,button:focus-visible,input:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.dform input:focus-visible{outline:2px solid #fff;outline-offset:2px}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}

/* ===== Security / Implementation / FAQ (v3 sections) ===== */
/* two operating modes */
.modes{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:32px}
@media(max-width:720px){.modes{grid-template-columns:1fr}}
.mode{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:26px}
.mode .tag{font-family:var(--mono);font-size:.66rem;letter-spacing:.1em;text-transform:uppercase;color:var(--accent);margin-bottom:12px}
.mode .tag.opt{color:var(--muted)}
.mode h3{margin-bottom:8px}
.mode p{font-size:1rem}
/* security controls */
.controls{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:34px}
@media(max-width:640px){.controls{grid-template-columns:1fr}}
.control{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:20px}
.control .cl{font-size:.95rem;font-weight:600;color:var(--ink);margin-bottom:6px}
.control p{font-size:.92rem}
.seealso{font-family:var(--mono);font-size:.74rem;color:var(--muted);margin-top:30px}
.seealso a{color:var(--accent);border-bottom:1px solid var(--line)}
.seealso a:hover{color:var(--ink)}
/* proof callout */
.proof{max-width:74ch;margin:40px auto 0;padding:24px 28px;border:1px solid var(--line);border-left:3px solid var(--verify);border-radius:12px;background:var(--card)}
.proof .m{font-family:var(--mono);font-size:.66rem;letter-spacing:.1em;text-transform:uppercase;color:var(--accent);margin-bottom:10px}
.proof p{font-family:var(--serif);font-size:1.12rem;color:var(--ink);line-height:1.42}
/* implementation input chips */
.inputs{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px;max-width:72ch}
.inputs span{font-family:var(--mono);font-size:.74rem;color:var(--ink);background:var(--wash);border:1px solid var(--line);border-radius:999px;padding:7px 14px}
/* faq accordions */
.faqs{margin-top:30px;max-width:78ch}
.faq{border-bottom:1px solid var(--line)}
.faq summary{list-style:none;cursor:pointer;padding:18px 2px;font-family:var(--serif);font-size:1.08rem;font-weight:600;color:var(--ink);display:flex;justify-content:space-between;gap:24px;align-items:baseline}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-family:var(--mono);color:var(--accent);font-weight:500;font-size:1.15rem;line-height:1}
.faq[open] summary::after{content:"\2212"}
.faq summary:hover{color:var(--accent)}
.faq p{font-size:1rem;padding:0 2px 20px;max-width:74ch}
.trust .t2 a{color:var(--accent);border-bottom:1px solid var(--line)}
.trust .t2 a:hover{color:var(--ink)}