/* ============================================================
   Crystal Bitcoin — Landing styles (dark crystalline theme)
   ============================================================ */
:root{
  --bg:#05121a;
  --bg-2:#081d28;
  --panel:#0b2330;
  --line:#15394a;
  --line-2:#1d4a5e;
  --ink:#eaf7fb;
  --muted:#8fb6c4;
  --muted-2:#5e8493;
  --cyan:#23d3ef;
  --cyan-2:#5ee6ff;
  --ice:#bff3ff;
  --shadow:0 18px 50px rgba(0,0,0,.45);
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;color:var(--ink);
  font-family:"Inter","Segoe UI",system-ui,-apple-system,sans-serif;
  line-height:1.65;-webkit-font-smoothing:antialiased;
  background:
    radial-gradient(1200px 700px at 82% -12%, rgba(35,211,239,.13), transparent 58%),
    radial-gradient(900px 600px at -12% 14%, rgba(94,230,255,.07), transparent 55%),
    var(--bg);
}
a{color:var(--cyan-2);text-decoration:none;}
a:hover{color:var(--ice);}
img{max-width:100%;display:block;}
.container{max-width:1120px;margin:0 auto;padding:0 24px;}
.eyebrow{color:var(--cyan);font-size:12px;font-weight:800;letter-spacing:2px;text-transform:uppercase;}

/* ---- Header ---- */
.site-header{position:sticky;top:0;z-index:50;background:rgba(5,18,26,.72);backdrop-filter:blur(12px);border-bottom:1px solid var(--line);}
.nav{display:flex;align-items:center;justify-content:space-between;height:72px;}
.brand{display:flex;align-items:center;gap:12px;font-weight:800;letter-spacing:.3px;color:#fff;font-size:19px;}
.brand .gem{width:28px;height:28px;flex:0 0 28px;background:linear-gradient(135deg,var(--cyan-2),var(--cyan) 55%,#0bb6d6);clip-path:polygon(50% 0,100% 35%,82% 100%,18% 100%,0 35%);box-shadow:0 0 20px rgba(35,211,239,.55);}
.nav-links{display:flex;align-items:center;gap:28px;list-style:none;margin:0;padding:0;}
.nav-links a{color:var(--muted);font-size:14px;font-weight:600;}
.nav-links a:hover{color:#fff;}
/* CTA-кнопка в шапке: тёмный текст на циане (перебиваем .nav-links a по специфичности) */
.nav-links a.btn-primary,
.nav-links a.btn-primary:hover{color:#04141c;}
.nav-links a.btn-ghost{color:var(--ice);}
.nav-links a.btn-ghost:hover{color:#fff;}
.btn{display:inline-flex;align-items:center;gap:8px;font-weight:700;font-size:14px;padding:11px 20px;border-radius:11px;transition:transform .15s,box-shadow .2s,background .2s;cursor:pointer;border:none;}
.btn-primary{background:linear-gradient(135deg,var(--cyan-2),var(--cyan));color:#04141c;box-shadow:0 8px 24px rgba(35,211,239,.28);}
.btn-primary:hover{transform:translateY(-2px);color:#04141c;box-shadow:0 12px 30px rgba(35,211,239,.4);}
.btn-ghost{background:transparent;color:var(--ice);border:1px solid var(--line-2);}
.btn-ghost:hover{border-color:var(--cyan);color:#fff;}

/* ---- Hero ---- */
.hero{position:relative;padding:96px 0 78px;overflow:hidden;}
.hero::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(35,211,239,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(35,211,239,.05) 1px,transparent 1px);background-size:54px 54px;mask-image:radial-gradient(700px 420px at 70% 20%,#000,transparent 80%);pointer-events:none;}
.hero .container{position:relative;display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center;}
.hero h1{font-size:54px;line-height:1.05;letter-spacing:-1.2px;margin:16px 0 18px;color:#fff;}
.hero h1 .grad{background:linear-gradient(120deg,var(--cyan-2),var(--ice));-webkit-background-clip:text;background-clip:text;color:transparent;}
.hero p.lead{font-size:18px;color:var(--muted);max-width:540px;margin:0 0 30px;}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;}
.hero-trust{display:flex;gap:22px;margin-top:34px;flex-wrap:wrap;}
.hero-trust .ht{font-size:13px;color:var(--muted-2);}
.hero-trust .ht b{display:block;color:#fff;font-size:22px;font-weight:800;letter-spacing:-.5px;}

/* crystal visual */
.crystal{position:relative;height:340px;}
.facet{position:absolute;border:1px solid rgba(94,230,255,.35);background:linear-gradient(135deg,rgba(35,211,239,.16),rgba(11,35,48,.2));backdrop-filter:blur(4px);box-shadow:inset 0 0 30px rgba(94,230,255,.12),0 10px 40px rgba(0,0,0,.4);}
.facet.f1{inset:30px 60px 120px 40px;clip-path:polygon(50% 0,100% 38%,78% 100%,22% 100%,0 38%);animation:float 7s ease-in-out infinite;}
.facet.f2{inset:120px 20px 40px 130px;clip-path:polygon(50% 0,100% 50%,50% 100%,0 50%);opacity:.7;animation:float 9s ease-in-out infinite reverse;}
.facet.glow{position:absolute;inset:60px 60px 80px 60px;background:radial-gradient(circle,rgba(35,211,239,.5),transparent 65%);filter:blur(26px);border:none;backdrop-filter:none;}
@keyframes float{0%,100%{transform:translateY(0) rotate(0)}50%{transform:translateY(-14px) rotate(2deg)}}

/* ---- Section ---- */
section{padding:74px 0;}
.section-head{max-width:640px;margin-bottom:42px;}
.section-head h2{font-size:36px;line-height:1.15;letter-spacing:-.6px;color:#fff;margin:12px 0 12px;}
.section-head p{color:var(--muted);font-size:16px;margin:0;}

/* ---- Features ---- */
.grid{display:grid;gap:22px;}
.grid.cols-3{grid-template-columns:repeat(3,1fr);}
.grid.cols-4{grid-template-columns:repeat(4,1fr);}
.card{background:linear-gradient(180deg,var(--panel),var(--bg-2));border:1px solid var(--line);border-radius:18px;padding:26px;transition:transform .2s,border-color .2s,box-shadow .2s;}
.card:hover{transform:translateY(-4px);border-color:var(--line-2);box-shadow:var(--shadow);}
.card .ic{width:46px;height:46px;border-radius:12px;display:grid;place-items:center;background:rgba(35,211,239,.12);border:1px solid var(--line-2);margin-bottom:16px;}
.card .ic svg{width:24px;height:24px;stroke:var(--cyan-2);fill:none;stroke-width:1.7;}
.card h3{font-size:18px;color:#fff;margin:0 0 8px;}
.card p{color:var(--muted);font-size:14.5px;margin:0;}

/* ---- Topics ---- */
.topics{background:linear-gradient(180deg,transparent,rgba(8,29,40,.5));border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.chips{display:flex;flex-wrap:wrap;gap:12px;}
.chip{padding:10px 18px;border:1px solid var(--line-2);border-radius:999px;color:var(--ice);font-size:14px;font-weight:600;background:rgba(11,35,48,.5);}
.chip:hover{border-color:var(--cyan);}

/* ---- Blog CTA ---- */
.blog-cta{position:relative;border:1px solid var(--line-2);border-radius:24px;padding:54px 48px;background:linear-gradient(135deg,rgba(35,211,239,.10),rgba(11,35,48,.55));overflow:hidden;}
.blog-cta::after{content:"";position:absolute;right:-60px;top:-60px;width:280px;height:280px;background:radial-gradient(circle,rgba(35,211,239,.3),transparent 65%);filter:blur(20px);}
.blog-cta .inner{position:relative;max-width:620px;}
.blog-cta h2{font-size:34px;letter-spacing:-.6px;color:#fff;margin:10px 0 14px;}
.blog-cta p{color:var(--muted);margin:0 0 26px;font-size:16px;}

/* ---- FAQ ---- */
.faq-list{display:flex;flex-direction:column;gap:12px;max-width:820px;}
.faq{border:1px solid var(--line);border-radius:14px;background:var(--panel);overflow:hidden;}
.faq summary{list-style:none;cursor:pointer;padding:20px 24px;font-weight:700;color:#fff;font-size:16px;display:flex;justify-content:space-between;align-items:center;gap:16px;}
.faq summary::-webkit-details-marker{display:none;}
.faq summary .plus{color:var(--cyan);font-size:22px;transition:transform .2s;flex:0 0 auto;}
.faq[open] summary .plus{transform:rotate(45deg);}
.faq .ans{padding:0 24px 22px;color:var(--muted);font-size:15px;}

/* ---- Latest from blog (cards) ---- */
.cb-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.cb-card{display:flex;flex-direction:column;background:linear-gradient(180deg,var(--panel),var(--bg-2));border:1px solid var(--line);border-radius:16px;overflow:hidden;text-decoration:none;transition:transform .2s,border-color .2s,box-shadow .2s;}
.cb-card:hover{transform:translateY(-4px);border-color:var(--line-2);box-shadow:var(--shadow);}
.cb-thumb{display:block;width:100%;aspect-ratio:16/9;background-size:cover;background-position:center;background-color:#0a2230;}
.cb-thumb-empty{background:linear-gradient(135deg,rgba(35,211,239,.18),rgba(11,35,48,.5));}
.cb-card-body{padding:18px 20px;display:flex;flex-direction:column;gap:9px;flex:1;}
.cb-meta{font-size:11px;font-weight:700;letter-spacing:.5px;text-transform:uppercase;color:var(--muted-2);}
.cb-card-title{font-size:17px;line-height:1.3;color:#fff;font-weight:700;}
.cb-card:hover .cb-card-title{color:var(--cyan-2);}
.cb-card-desc{font-size:14px;color:var(--muted);line-height:1.55;}
@media(max-width:920px){.cb-cards{grid-template-columns:1fr 1fr;}}
@media(max-width:640px){.cb-cards{grid-template-columns:1fr;}}

/* ---- Footer ---- */
.site-footer{border-top:1px solid var(--line);padding:46px 0 36px;}
.footer-grid{display:flex;justify-content:space-between;gap:30px;flex-wrap:wrap;align-items:flex-start;}
.footer-grid .fcol h4{color:#fff;font-size:14px;margin:0 0 12px;}
.footer-grid .fcol a{display:block;color:var(--muted);font-size:14px;margin-bottom:8px;}
.footer-bottom{margin-top:34px;padding-top:22px;border-top:1px solid var(--line);color:var(--muted-2);font-size:13px;display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;}
.foot-note{max-width:560px;}

/* reveal */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s,transform .6s;}
.reveal.in{opacity:1;transform:none;}

/* mobile */
.burger{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:6px;}
.burger span{width:24px;height:2px;background:var(--ice);border-radius:2px;}
@media(max-width:920px){
  .hero .container{grid-template-columns:1fr;}
  .crystal{height:240px;order:-1;}
  .hero h1{font-size:42px;}
  .grid.cols-3,.grid.cols-4{grid-template-columns:1fr 1fr;}
}
@media(max-width:640px){
  .nav-links{display:none;}
  .nav-links.open{display:flex;position:absolute;top:72px;left:0;right:0;flex-direction:column;background:var(--bg-2);border-bottom:1px solid var(--line);padding:18px 24px;gap:18px;}
  .burger{display:flex;}
  .hero{padding:64px 0 54px;}
  .hero h1{font-size:34px;}
  .section-head h2{font-size:28px;}
  .grid.cols-3,.grid.cols-4{grid-template-columns:1fr;}
  .blog-cta{padding:36px 26px;}
  section{padding:54px 0;}
}