/* CardSync Core: public site. Static; GitHub Pages. */
/* Dark theme. */
:root{
  color-scheme:dark;
  --bg:#0b1120; --bg-soft:#0f172a; --panel:#111a2e; --panel-2:#16213a;
  --ink:#f1f5f9; --ink-2:#cbd5e1; --ink-3:#94a3b8;
  --line:#1f2a44; --line-2:#2b3858;
  --brand:#3b82f6; --brand-ink:#2563eb; --brand-text:#93c5fd; --brand-soft:rgba(59,130,246,.14);
  --accent:#f59e0b; --ok:#22c55e; --dark:#070b16;
  --radius:14px; --shadow:0 1px 2px rgba(0,0,0,.4),0 10px 30px rgba(0,0,0,.35);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 Inter,system-ui,-apple-system,"Segoe UI",sans-serif;-webkit-font-smoothing:antialiased}
a{color:var(--brand-text);text-decoration:none}
img{max-width:100%}
.wrap{max-width:1140px;margin:0 auto;padding:0 20px}
h1,h2,h3{line-height:1.15;letter-spacing:-.02em;margin:0 0 .5em}
h1{font-size:clamp(2.2rem,5vw,3.6rem);font-weight:800}
h2{font-size:clamp(1.7rem,3.4vw,2.4rem);font-weight:800}
h3{font-size:1.15rem;font-weight:700}
p{margin:0 0 1em;color:var(--ink-2)}
.eyebrow{display:inline-block;font-size:.78rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--brand-text);margin-bottom:.8em}
.lead{font-size:1.15rem;max-width:640px}
.center{text-align:center}.center .lead{margin-left:auto;margin-right:auto}

/* nav */
.nav{position:sticky;top:0;z-index:20;background:rgba(11,17,32,.85);backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;gap:28px;height:64px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.2rem;color:var(--ink)}
.logo-mark{width:34px;height:34px;border-radius:10px;background:var(--brand);display:grid;place-items:center;color:#fff;font-size:.95rem;box-shadow:0 0 0 1px rgba(255,255,255,.08),0 6px 18px rgba(59,130,246,.35)}
.logo b{color:var(--brand-text)}
.logo i{font-style:normal;font-weight:600;color:var(--ink-3)}
.nav-links{display:flex;gap:22px;margin-right:auto}
.nav-links a{color:var(--ink-3);font-weight:500;font-size:.95rem}
.nav-links a:hover,.nav-links a.active{color:var(--ink)}
.nav-cta{display:flex;gap:10px;align-items:center}
.menu-btn{display:none;margin-left:auto;background:none;color:var(--ink);border:1px solid var(--line-2);border-radius:8px;padding:6px 10px;font:inherit;cursor:pointer}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 20px;border-radius:10px;font-weight:600;font-size:.95rem;border:1px solid transparent;cursor:pointer;transition:background .15s,border-color .15s}
.btn-primary{background:var(--brand);color:#fff}.btn-primary:hover{background:var(--brand-ink)}
.btn-ghost{color:var(--ink);border-color:var(--line-2);background:transparent}.btn-ghost:hover{border-color:var(--ink-3);background:rgba(255,255,255,.03)}
.btn-lg{padding:14px 26px;font-size:1rem}

/* sections */
section{padding:88px 0}
.soft{background:var(--bg-soft)}
.dark{background:var(--dark);color:var(--ink-2)}.dark p{color:var(--ink-3)}.dark h2,.dark h3{color:#fff}
.grid{display:grid;gap:22px}
.g2{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:repeat(3,1fr)}.g4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow)}
.soft .card{background:var(--panel-2)}
.card p:last-child{margin-bottom:0}
.ticks{list-style:none;padding:0;margin:0}
.ticks li{position:relative;padding-left:26px;margin:0 0 .55em;color:var(--ink-2)}
.ticks li::before{content:"";position:absolute;left:2px;top:.5em;width:12px;height:7px;border-left:2px solid var(--ok);border-bottom:2px solid var(--ok);transform:rotate(-45deg)}
.pill{display:inline-block;font-size:.75rem;font-weight:600;padding:3px 10px;border-radius:999px;background:var(--brand-soft);color:var(--brand-text)}
.cta-band{background:linear-gradient(135deg,#1d4ed8,#2563eb 55%,#4f46e5);color:#fff;border-radius:20px;padding:56px 40px;text-align:center;box-shadow:0 20px 60px rgba(37,99,235,.25)}
.cta-band h2{color:#fff}.cta-band p{color:#dbeafe}
.cta-band .btn-primary{background:#fff;color:#1d4ed8}.cta-band .btn-primary:hover{background:#eff6ff}

/* home */
.hero{padding:96px 0 72px;background:radial-gradient(900px 420px at 15% 0%,rgba(59,130,246,.22),transparent 70%),radial-gradient(700px 380px at 90% 30%,rgba(79,70,229,.16),transparent 70%),var(--bg)}
.hero .wrap{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin:26px 0 14px}
.hero-note{font-size:.88rem;color:var(--ink-3)}
.truth{background:var(--panel);border:1px solid var(--line-2);border-radius:18px;box-shadow:var(--shadow);padding:22px}
.truth-core{background:var(--brand);color:#fff;border-radius:12px;padding:16px 18px;text-align:center;font-weight:700}
.truth-core small{display:block;font-weight:500;color:#dbeafe}
.truth-arrows{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:14px}
.truth-arrows span{border:1px dashed rgba(147,197,253,.45);border-radius:10px;padding:10px 4px;text-align:center;font-size:.8rem;font-weight:600;color:var(--brand-text);background:var(--brand-soft)}
.truth-caption{margin:14px 0 0;font-size:.85rem;text-align:center;color:var(--ink-3)}
.layer{border-top:4px solid var(--brand)}
.layer:nth-child(2){border-top-color:var(--accent)}
.layer:nth-child(3){border-top-color:var(--ok)}
.who{font-size:.8rem;font-weight:600;color:var(--ink-3);margin-top:14px;padding-top:12px;border-top:1px solid var(--line)}
.flow{display:grid;grid-template-columns:repeat(5,1fr);gap:14px;counter-reset:step}
.flow .card{padding:20px}
.flow .card::before{counter-increment:step;content:counter(step);display:grid;place-items:center;width:28px;height:28px;border-radius:50%;background:var(--brand);color:#fff;font-weight:700;font-size:.85rem;margin-bottom:10px}
.logos{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;margin-top:28px}
.logos span{border:1px solid var(--line-2);background:var(--panel);border-radius:10px;padding:10px 18px;font-weight:600;color:var(--ink)}
.stat{font-size:2.4rem;font-weight:800;color:var(--brand-text);line-height:1}
.ai-steps{counter-reset:ai}
.ai-steps .card::before{counter-increment:ai;content:counter(ai);display:inline-grid;place-items:center;width:28px;height:28px;border-radius:50%;background:var(--brand-soft);color:var(--brand-text);font-weight:700;font-size:.85rem;margin-bottom:10px}

/* scan demo (index.html #scanDemo, driven by scan-demo.js) */
.demo{max-width:920px;margin:40px auto 0;background:var(--panel);border:1px solid var(--line-2);border-radius:18px;box-shadow:0 24px 70px rgba(0,0,0,.45),0 0 0 1px rgba(59,130,246,.08);overflow:hidden;text-align:left}
.demo-bar{display:flex;align-items:center;gap:14px;padding:12px 16px;border-bottom:1px solid var(--line);background:var(--panel-2);font-size:.85rem}
.demo-dots{display:flex;gap:6px}.demo-dots i{width:10px;height:10px;border-radius:50%;background:var(--line-2)}
.demo-title{font-weight:700;color:var(--ink)}
.demo-total{margin-left:auto;color:var(--ink-3)}.demo-total b{color:var(--ink);font-variant-numeric:tabular-nums}
.demo-body{display:grid;grid-template-columns:230px 1fr;gap:26px;padding:26px}
.demo-scanner{display:flex;flex-direction:column;align-items:center;gap:10px}
.demo-tray{position:relative;width:190px;height:260px;border-radius:14px;background:#0a1020;border:1px dashed var(--line-2);display:grid;place-items:center;overflow:hidden}
.demo-tray-label{font-size:.75rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-3)}
.demo-card{position:relative;width:150px;height:210px;border-radius:9px;padding:9px;background:linear-gradient(160deg,#e8d48b,#cdb35c);box-shadow:0 8px 24px rgba(0,0,0,.5);transform:translateY(-130%);opacity:0;transition:transform .6s cubic-bezier(.2,.8,.2,1),opacity .4s}
.demo-card.in{transform:none;opacity:1}
.demo-card.out{transform:translateX(140%) rotate(8deg);opacity:0}
.dc-art{height:108px;border-radius:5px;background:linear-gradient(135deg,var(--a1,#475569),var(--a2,#94a3b8));position:relative;overflow:hidden;box-shadow:inset 0 0 0 2px rgba(0,0,0,.15)}
.dc-art::before{content:"";position:absolute;width:62px;height:62px;border-radius:50%;left:44px;top:22px;background:rgba(255,255,255,.28)}
.dc-line{height:9px;border-radius:4px;background:rgba(60,45,10,.35);margin-top:12px}
.dc-line.short{width:60%}
.demo-card.holo .dc-art::after,.demo-card.reverse::after{content:"";position:absolute;inset:0;background:linear-gradient(115deg,transparent 20%,rgba(255,255,255,.55) 35%,rgba(147,197,253,.4) 45%,rgba(244,114,182,.35) 55%,transparent 70%);background-size:250% 100%;animation:dm-shine 2.2s linear infinite;mix-blend-mode:screen;pointer-events:none}
.demo-card.reverse::after{border-radius:9px}
.demo-card.reverse .dc-art{z-index:1}
@keyframes dm-shine{from{background-position:120% 0}to{background-position:-120% 0}}
.demo-beam{position:absolute;left:8px;right:8px;top:0;height:3px;border-radius:2px;background:var(--brand-text);box-shadow:0 0 18px 6px rgba(59,130,246,.55);opacity:0}
.demo-beam.sweep{animation:dm-sweep .9s ease-in-out}
@keyframes dm-sweep{0%{top:12px;opacity:0}10%{opacity:1}90%{opacity:1}100%{top:245px;opacity:0}}
.demo-panel{display:flex;flex-direction:column;gap:16px;min-width:0}
.demo-steps{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,1fr);gap:8px;counter-reset:dm}
.demo-steps li{counter-increment:dm;border:1px solid var(--line-2);border-radius:10px;padding:8px 6px;text-align:center;font-size:.8rem;font-weight:600;color:var(--ink-3);transition:all .25s}
.demo-steps li::before{content:counter(dm) " ";color:var(--ink-3)}
.demo-steps li.on{border-color:var(--brand);color:var(--brand-text);background:var(--brand-soft)}
.demo-steps li.done{border-color:rgba(34,197,94,.45);color:#86efac;background:rgba(34,197,94,.08)}
.demo-steps li.done::before{content:"✓ ";color:var(--ok)}
.demo-match{border:1px solid var(--line-2);border-radius:12px;padding:16px 18px;background:var(--bg-soft);min-height:150px}
.dm-name{font-size:1.25rem;font-weight:800;color:var(--ink);min-height:1.5em}
.dm-meta{color:var(--ink-3);font-size:.92rem;min-height:1.5em}
.dm-num{display:inline-block;font-weight:700;color:var(--ink);border-radius:6px;padding:0 6px;transition:background .3s}
.dm-num.flash{background:rgba(245,158,11,.25)}
.dm-tags{display:flex;gap:8px;margin:10px 0;min-height:26px}
.dm-finish,.dm-conf{font-size:.78rem;font-weight:700;padding:4px 10px;border-radius:999px;opacity:0;transform:translateY(4px);transition:all .25s}
.dm-finish{background:rgba(245,158,11,.15);color:#fcd34d}
.dm-conf{background:rgba(34,197,94,.12);color:#86efac}
.dm-tags .show{opacity:1;transform:none}
.dm-foot{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;border-top:1px solid var(--line);padding-top:12px}
.dm-price{color:var(--ink-3)}.dm-price b{color:var(--ink);font-size:1.15rem;font-variant-numeric:tabular-nums}
.dm-key{font-size:.8rem;color:var(--ink-3)}
.demo kbd{display:inline-block;font:600 .75rem Inter,system-ui,sans-serif;color:var(--ink);background:var(--panel-2);border:1px solid var(--line-2);border-bottom-width:3px;border-radius:6px;padding:2px 7px;transition:all .12s}
.demo kbd.press{transform:translateY(2px);border-bottom-width:1px;background:var(--brand);border-color:var(--brand);color:#fff}
.demo-added{border:1px solid var(--line);border-radius:12px;overflow:hidden}
.da-head{font-size:.75rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-3);padding:8px 14px;background:var(--panel-2)}
.demo-added ul{list-style:none;margin:0;padding:0;min-height:120px}
.demo-added li{display:flex;justify-content:space-between;gap:10px;padding:9px 14px;border-top:1px solid var(--line);font-size:.88rem;color:var(--ink-2);animation:dm-row .35s ease-out}
.demo-added li b{color:var(--ink);font-weight:600}
.demo-added li span:last-child{color:var(--ink);font-variant-numeric:tabular-nums;white-space:nowrap}
@keyframes dm-row{from{opacity:0;transform:translateY(-6px);background:var(--brand-soft)}to{opacity:1;transform:none}}

/* features */
.fhero{padding:84px 0 40px;text-align:center;background:radial-gradient(900px 380px at 50% 0%,rgba(59,130,246,.2),transparent 70%),var(--bg)}
.jump{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:22px}
.jump a{border:1px solid var(--line-2);background:var(--panel);border-radius:999px;padding:6px 14px;font-size:.88rem;color:var(--ink-2);font-weight:500}
.jump a:hover{border-color:var(--brand);color:var(--brand-text)}
.feat{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start;padding:56px 0;border-bottom:1px solid var(--line)}
.feat:last-child{border-bottom:0}
.feat .card{background:var(--panel);box-shadow:none}

/* footer */
footer{background:var(--dark);color:var(--ink-3);padding:56px 0 32px;font-size:.92rem;border-top:1px solid var(--line)}
footer .grid{grid-template-columns:2fr 1fr 1fr}
footer h4{color:#fff;font-size:.85rem;text-transform:uppercase;letter-spacing:.06em;margin:0 0 12px}
footer a{color:var(--ink-3);display:block;margin-bottom:8px}footer a:hover{color:#fff}
footer .logo{color:#fff}
footer .logo i{color:var(--ink-3)}
.legal{border-top:1px solid var(--line);margin-top:36px;padding-top:20px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}

@media (max-width:900px){
  .g3,.g4{grid-template-columns:repeat(2,1fr)}
  footer .grid{grid-template-columns:1fr 1fr}
  .hero .wrap{grid-template-columns:1fr}
  .flow{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:720px){
  section{padding:64px 0}
  .g2,.g3,.g4{grid-template-columns:1fr}
  .menu-btn{display:block}
  .nav-links,.nav-cta{display:none}
  .nav.open .wrap{flex-wrap:wrap;height:auto;padding-top:12px;padding-bottom:16px}
  .nav.open .nav-links,.nav.open .nav-cta{display:flex;flex-direction:column;align-items:flex-start;width:100%;gap:12px}
  .cta-band{padding:40px 22px}
  .flow{grid-template-columns:1fr}
  .truth-arrows{grid-template-columns:repeat(2,1fr)}
  .feat{grid-template-columns:1fr;gap:18px;padding:40px 0}
  .demo-body{grid-template-columns:1fr;gap:18px;padding:18px}
  .demo-tray{width:150px;height:200px}
  .demo-card{width:118px;height:165px;padding:7px}
  .dc-art{height:84px}.dc-art::before{width:46px;height:46px;left:29px;top:18px}
  @keyframes dm-sweep{0%{top:10px;opacity:0}10%{opacity:1}90%{opacity:1}100%{top:188px;opacity:0}}
  .demo-steps{grid-template-columns:repeat(2,1fr)}
  .dm-key{display:none}
}
@media (prefers-reduced-motion:reduce){
  .demo-card,.demo-steps li,.dm-finish,.dm-conf{transition:none}
  .demo-card.holo .dc-art::after,.demo-card.reverse::after,.demo-added li{animation:none}
}