:root{
  --ink:#0d0d10;
  --ink-2:#2a2a31;
  --muted:#5f6068;
  --paper:#f6f4ef;
  --card:#ffffff;
  --line:#e2dfd7;
  --accent:#ff4d2e;
  --accent-ink:#ffffff;
  --soft:#ffe8e2;
  --radius:18px;
  --max:1120px;
  --font-head:"Space Grotesk",system-ui,sans-serif;
  --font-body:"Inter",system-ui,-apple-system,"Segoe UI",sans-serif;
}
@media (prefers-color-scheme:dark){
  :root{
    --ink:#f4f2ec;--ink-2:#d6d4cd;--muted:#a3a29c;--paper:#111114;--card:#1a1a1f;
    --line:#2c2c33;--soft:#2b1a16;
  }
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font-body);background:var(--paper);color:var(--ink);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:inherit}
img{max-width:100%;display:block}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}

/* Header */
.site-header{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--paper) 88%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px;gap:16px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none}
.brand-mark{font-family:var(--font-head);font-weight:700;font-size:1.45rem;letter-spacing:.04em}
.brand-mark sup{font-size:.55em;font-weight:500;margin-left:2px;vertical-align:super}
.brand-badge{width:34px;height:34px;border-radius:9px;background:var(--ink);color:var(--paper);display:grid;place-items:center;font-family:var(--font-head);font-weight:700;font-size:1.05rem}
.nav-links{display:flex;gap:26px;list-style:none}
.nav-links a{text-decoration:none;font-size:.95rem;color:var(--ink-2)}
.nav-links a:hover{color:var(--accent)}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 22px;border-radius:999px;font-weight:600;text-decoration:none;font-size:.95rem;border:1.5px solid var(--ink);transition:transform .15s,background .15s}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.btn-ghost{background:transparent;color:var(--ink)}
.menu-toggle{display:none;background:none;border:1.5px solid var(--line);border-radius:10px;width:42px;height:42px;font-size:1.2rem;color:var(--ink);cursor:pointer}

/* Hero */
.hero{padding:80px 0 70px}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:center}
.eyebrow{display:inline-block;font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);font-weight:600;margin-bottom:18px}
h1,h2,h3{font-family:var(--font-head);line-height:1.1;letter-spacing:-.01em}
h1{font-size:clamp(2.4rem,5.6vw,4.2rem);font-weight:700}
h1 em{font-style:normal;color:var(--accent)}
.lead{font-size:1.15rem;color:var(--muted);margin:22px 0 32px;max-width:540px}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px}
.hero-meta{display:flex;gap:28px;margin-top:40px;flex-wrap:wrap}
.hero-meta div strong{display:block;font-family:var(--font-head);font-size:1.5rem}
.hero-meta div span{font-size:.85rem;color:var(--muted)}

/* Card stack visual */
.stack{position:relative;height:380px}
.vcard{position:absolute;width:300px;height:180px;border-radius:16px;padding:22px;display:flex;flex-direction:column;justify-content:space-between;box-shadow:0 24px 50px -20px rgba(0,0,0,.35)}
.vcard .vc-top{display:flex;justify-content:space-between;align-items:flex-start}
.vcard .vc-name{font-family:var(--font-head);font-weight:700;font-size:1.15rem}
.vcard .vc-role{font-size:.78rem;opacity:.75}
.vcard .vc-logo{font-family:var(--font-head);font-weight:700;letter-spacing:.08em;font-size:.85rem}
.vc-1{background:#0d0d10;color:#f6f4ef;top:20px;left:10px;transform:rotate(-8deg)}
.vc-2{background:var(--accent);color:#fff;top:110px;left:120px;transform:rotate(5deg)}
.vc-3{background:#fff;color:#0d0d10;top:200px;left:30px;transform:rotate(-2deg);border:1px solid #e2dfd7}
.nfc{width:30px;height:30px}
.qr{width:46px;height:46px;background:
  conic-gradient(from 90deg at 2px 2px,#0d0d10 25%,#fff 0) 0 0/8px 8px;border:3px solid #0d0d10;border-radius:4px}

/* Sections */
section{padding:84px 0}
.section-head{max-width:640px;margin-bottom:46px}
.section-head h2{font-size:clamp(1.8rem,3.6vw,2.6rem)}
.section-head p{color:var(--muted);margin-top:12px;font-size:1.05rem}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.tile{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.tile .ico{width:44px;height:44px;border-radius:12px;background:var(--soft);color:var(--accent);display:grid;place-items:center;margin-bottom:18px}
.tile h3{font-size:1.15rem;margin-bottom:8px}
.tile p{color:var(--muted);font-size:.95rem}
.tile .tag{display:inline-block;margin-top:14px;font-size:.75rem;font-weight:600;color:var(--ink-2);border:1px solid var(--line);border-radius:999px;padding:3px 10px}

.band{background:var(--ink);color:var(--paper)}
.band .section-head p{color:color-mix(in srgb,var(--paper) 70%,transparent)}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;counter-reset:s}
.step{border-top:1.5px solid color-mix(in srgb,var(--paper) 25%,transparent);padding-top:22px}
.step::before{counter-increment:s;content:"0" counter(s);font-family:var(--font-head);font-size:.9rem;color:var(--accent);font-weight:700}
.step h3{margin:10px 0 8px;font-size:1.25rem}
.step p{color:color-mix(in srgb,var(--paper) 70%,transparent);font-size:.95rem}

/* Trademark */
.tm-table{width:100%;border-collapse:collapse;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.tm-table th,.tm-table td{text-align:left;padding:16px 18px;border-bottom:1px solid var(--line);font-size:.93rem;vertical-align:top}
.tm-table th{font-size:.75rem;text-transform:uppercase;letter-spacing:.1em;color:var(--muted);font-weight:600;background:color-mix(in srgb,var(--paper) 60%,var(--card))}
.tm-table tr:last-child td{border-bottom:0}
.tm-no{font-family:var(--font-head);font-weight:700}
.status{display:inline-block;font-size:.75rem;font-weight:600;padding:4px 10px;border-radius:999px;background:var(--soft);color:var(--accent);white-space:nowrap}
.tm-note{margin-top:18px;font-size:.88rem;color:var(--muted);max-width:760px}
.table-scroll{overflow-x:auto;border-radius:var(--radius)}

/* FAQ */
.faq{max-width:780px}
details{border-bottom:1px solid var(--line);padding:20px 0}
summary{cursor:pointer;font-family:var(--font-head);font-weight:600;font-size:1.1rem;list-style:none;display:flex;justify-content:space-between;gap:16px}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";color:var(--accent);font-size:1.4rem;line-height:1}
details[open] summary::after{content:"–"}
details p{color:var(--muted);margin-top:10px}

/* Contact */
.contact-box{background:var(--card);border:1px solid var(--line);border-radius:24px;padding:48px;display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
.contact-box h2{font-size:clamp(1.8rem,3.4vw,2.4rem)}
.contact-box p{color:var(--muted);margin-top:12px}
.contact-list{list-style:none;display:grid;gap:14px}
.contact-list a{display:flex;align-items:center;gap:14px;padding:16px 18px;border:1px solid var(--line);border-radius:14px;text-decoration:none;font-weight:500}
.contact-list a:hover{border-color:var(--accent)}
.contact-list small{display:block;color:var(--muted);font-weight:400;font-size:.8rem}

/* Footer */
.site-footer{border-top:1px solid var(--line);padding:56px 0 32px;font-size:.92rem}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px}
.foot-grid h4{font-size:.78rem;text-transform:uppercase;letter-spacing:.12em;color:var(--muted);margin-bottom:14px;font-family:var(--font-body)}
.foot-grid ul{list-style:none;display:grid;gap:8px}
.foot-grid a{text-decoration:none;color:var(--ink-2)}
.foot-grid a:hover{color:var(--accent)}
.foot-about p{color:var(--muted);margin-top:12px;max-width:340px}
.foot-bottom{margin-top:44px;padding-top:22px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;color:var(--muted);font-size:.84rem}

/* Legal pages */
.legal{padding:60px 0 90px}
.legal .wrap{max-width:820px}
.legal h1{font-size:clamp(2rem,4.4vw,2.8rem);margin-bottom:8px}
.legal .updated{color:var(--muted);font-size:.9rem;margin-bottom:36px}
.legal h2{font-size:1.3rem;margin:34px 0 10px}
.legal p,.legal li{color:var(--ink-2);margin-bottom:10px}
.legal ul{padding-left:22px;margin-bottom:12px}
.legal .back{display:inline-block;margin-bottom:28px;text-decoration:none;color:var(--accent);font-weight:600}

/* Responsive */
@media (max-width:900px){
  .hero-grid,.contact-box{grid-template-columns:1fr}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3,.steps{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
  .foot-about{grid-column:1/-1}
  .stack{height:340px;max-width:440px}
  .contact-box{padding:30px}
}
@media (max-width:760px){
  .nav-links{display:none;position:absolute;top:68px;left:0;right:0;flex-direction:column;gap:0;background:var(--paper);border-bottom:1px solid var(--line);padding:8px 20px 16px}
  .nav-links.open{display:flex}
  .nav-links a{display:block;padding:12px 0}
  .menu-toggle{display:block}
  .nav .btn{display:none}
}
@media (max-width:560px){
  .grid-4{grid-template-columns:1fr}
  .hero{padding:48px 0}
  section{padding:60px 0}
  .vcard{width:250px;height:150px;padding:18px}
  .vc-2{left:70px}
  .foot-grid{grid-template-columns:1fr}
}

/* Logo (filed device mark) */
.brand{gap:2px;align-items:flex-start}
.brand-logo{height:24px;width:auto}
.brand-tm{font-size:.7rem;font-weight:600;line-height:1;margin-top:-2px}
.foot-about .brand-logo{height:28px}
@media (prefers-color-scheme:dark){.brand-logo{filter:invert(1) brightness(.96)}}
.legal .contact-list{padding-left:0}