:root{
  --bg: #0b0f14;
  --surface: #0f1520cc;
  --surface-strong:#121a28cc;
  --text: #e9eef5;
  --muted:#a6b3c3;
  --brand-1:#7cf3ff;
  --brand-2:#a78bfa;
  --brand-3:#00ffa3;
  --ring: #77e3ff;
  --card: #0f1520b3;
  --border: #223043;
  --shadow: 0 10px 30px rgba(0,0,0,.35), 0 2px 8px rgba(0,0,0,.2);
}

* { box-sizing: border-box; }
html,body{ height:100%; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  font-family: "Inter", system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color:var(--text);
  background: var(--bg);
  line-height:1.6;
}
a{
  color: var(--text);
}

/* Deko */
.bg.fx-grid{
  position: fixed; inset: 0; pointer-events:none; z-index:-2;
  background:
    linear-gradient(to right, rgba(255,255,255,.04) 1px, transparent 1px) 0 0/40px 40px,
    linear-gradient(to bottom, rgba(255,255,255,.04) 1px, transparent 1px) 0 0/40px 40px;
  mask-image: radial-gradient(80% 50% at 50% 0%, #000 50%, transparent 80%);
}
.bg.fx-gradient{
  position: fixed; inset: 0; pointer-events:none; z-index:-3;
  background: radial-gradient(1200px 600px at 80% 0%,
              color-mix(in oklab, var(--brand-2), transparent 60%) 0%,
              transparent 60%),
              radial-gradient(900px 500px at 10% 20%,
              color-mix(in oklab, var(--brand-1), transparent 70%) 0%,
              transparent 60%),
              radial-gradient(700px 500px at 50% 100%,
              color-mix(in oklab, var(--brand-3), transparent 70%) 0%,
              transparent 60%);
  filter: blur(10px) saturate(1.1);
}

/* Layout */
.container{ width:min(1100px, 92%); margin-inline:auto; }
.section{ padding: clamp(3rem, 6vw, 6rem) 0; }
.section.alt{ background: linear-gradient(180deg, transparent, rgba(255,255,255,.02)); }
.section-lead{ color:var(--muted); margin-top:.4rem; }
.grid{ display:grid; gap: clamp(1rem, 2vw, 1.4rem); grid-template-columns: repeat(12, 1fr); }

.card{
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 1.1rem 1.1rem 1.2rem;
  box-shadow: var(--shadow);
}
.card h3{ margin:.1rem 0 .4rem; }
.card p{ margin:0; color:var(--muted); }
.muted{ color:var(--muted); }

/* Header */
.site-header{
  position: sticky; top:0; z-index:50;
  backdrop-filter: blur(8px);
  background: linear-gradient(180deg, rgba(10,12,16,.7), rgba(10,12,16,.3));
  border-bottom: 1px solid rgba(255,255,255,.05);
}
.header-inner{
  display:grid; grid-template-columns: auto 1fr auto; align-items:center;
  gap: 1rem; padding: .8rem 0;
}
.brand{
  display:flex; align-items:center; gap:.6rem; text-decoration:none; color:var(--text);
  font-weight:800; letter-spacing:.2px;
}
.logo{ width:32px; height:32px; mask-image: linear-gradient(to bottom, black 70%, transparent 100%); -webkit-mask-image: linear-gradient(to bottom, black 70%, transparent 100%); }
.nav-list{ display:flex; gap:1.2rem; list-style:none; margin:0; padding:0; align-items:center; }
.nav-list a{ color:var(--muted); text-decoration:none; padding:.4rem .6rem; border-radius:10px; }
.nav-list a:hover{ color:var(--text); background: rgba(255,255,255,.06); }
.header-cta{ display:flex; gap:.6rem; align-items:center; }
.nav-toggle{ display:none; background:none; border:none; cursor:pointer; padding:.4rem; border-radius:10px; }
.nav-toggle:hover{ background: rgba(255,255,255,.06); }
.nav-toggle .bar{ display:block; width:22px; height:2px; background:var(--text); margin:4px 0; border-radius:2px; }

/* Buttons */
.btn{
  display:inline-flex; align-items:center; justify-content:center;
  padding:.7rem 1rem; border-radius:14px; text-decoration:none; font-weight:600;
  border:1px solid transparent; transition: transform .06s ease, background .2s ease, border .2s ease;
  box-shadow: var(--shadow);
  color:#0a0c10;
}
.btn:hover{ transform: translateY(-1px); }
.btn:active{ transform: translateY(0); }
.btn-primary{
  background: linear-gradient(135deg, var(--brand-1), var(--brand-2));
  border-color: color-mix(in oklab, var(--brand-2), #000 15%);
  color:#0a0c10;
}
.btn-ghost{
  background: rgba(255,255,255,.06);
  color: var(--text);
  border-color: rgba(255,255,255,.12);
}

/* Hero */
.hero{ padding: clamp(3.5rem, 8vw, 8rem) 0; }
.hero-inner{ display:grid; grid-template-columns:1.05fr .95fr; gap: clamp(1.5rem, 4vw, 3rem); align-items:center; }
.hero h1{ font-size: clamp(2.2rem, 5vw, 3.6rem); line-height:1.1; margin:0 0 .6rem; }
.hero .lead{ color:var(--muted); font-size: clamp(1rem, 2vw, 1.15rem); max-width: 60ch; }
.accent{ background: linear-gradient(135deg, var(--brand-1), var(--brand-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-visual{ display:flex; justify-content:center; }
.circuit-card{
  width:min(520px, 100%); aspect-ratio: 16/10;  
  mask-image: linear-gradient(to right, transparent, var(--bg) 10%, var(--bg) 90%, transparent), 
                linear-gradient(to bottom, transparent, var(--bg) 10%, var(--bg) 90%, transparent);
  mask-composite: intersect; -webkit-mask-composite: source-in;
  border:1px solid var(--border);
  border-radius:50px; 
  position:relative; 
  overflow:hidden; 
  box-shadow: var(--shadow);
}
.circuit-card::after{
  content:""; position:absolute; inset:0;
  background:
    radial-gradient(400px 200px at 20% 0%, rgba(124,243,255,.15), transparent 60%),
    radial-gradient(400px 260px at 100% 100%, rgba(167,139,250,.15), transparent 60%);
  pointer-events:none;
}

/* Version picker */
.version-picker{ margin-top:1rem; }
.vp-row{ display:flex; gap:1rem; align-items:center; justify-content:space-between; margin-top:.6rem; flex-wrap:wrap; }
.version-picker label{ font-weight:700; }
.version-picker select{
  background: rgba(255,255,255,.06); border:1px solid rgba(255,255,255,.16);
  color:var(--text); border-radius:12px; padding:.6rem .8rem; font: inherit; min-width: 220px;
}
.version-picker select:focus{ outline:none; border-color: var(--ring); box-shadow: 0 0 0 3px rgba(119,227,255,.15); }
.meta{ color:var(--muted); font-size:.95rem; }

/* Download grid */
.download-grid .platform{ grid-column: span 6; }
@media (max-width:760px){ .download-grid .platform{ grid-column: span 12; } }

.platform-head{ display:flex; align-items:center; gap:.8rem; margin-bottom:.2rem; }
.avatar{
  width:40px; height:40px; border-radius:11px; display:grid; place-items:center;
  background: linear-gradient(135deg, var(--brand-1), var(--brand-2)); color:#0a0c10; font-weight:800;
}
.btn-row{ display:flex; gap:.6rem; flex-wrap:wrap; margin:.8rem 0 .6rem; }
.hashes{ display:grid; gap:.35rem; }
.hashes .tag{
  display:inline-block; padding:.1rem .4rem; border-radius:8px; font-size:.8rem;
  background: rgba(255,255,255,.06); border:1px solid rgba(255,255,255,.12); color:var(--text);
}
.hashes code{ user-select: all; }

/* Two column section */
.two-col{ display:grid; grid-template-columns: 1fr 1fr; gap:clamp(1rem, 2vw, 1.4rem); }
@media (max-width:960px){ .hero-inner{ grid-template-columns:1fr; } .two-col{ grid-template-columns:1fr; } }

.reqs{ margin:.4rem 0 0; padding-left:1.1rem; }
.reqs li{ margin:.2rem 0; }

.faq details{ background: rgba(255,255,255,.04); border:1px solid rgba(255,255,255,.1); border-radius:12px; padding:.6rem .8rem; margin:.6rem 0; }
.faq summary{ cursor:pointer; font-weight:700; }
.small{ font-size:.95rem; color:var(--muted); }
.small code{ color:var(--text); }

/* Table */
.table-wrap{ overflow:auto; }
.table{
  width:100%; border-collapse: collapse; font-size:.98rem;
}
.table th, .table td{
  border-bottom: 1px solid rgba(255,255,255,.08);
  padding:.6rem .5rem; text-align:left;
}
.table thead th{ color:var(--muted); font-weight:700; }
.table .links a{ margin-right:.6rem; }

/* Footer */
.site-footer{
  padding: 2rem 0; border-top:1px solid rgba(255,255,255,.06);
  background: linear-gradient(180deg, rgba(10,12,16,.4), rgba(10,12,16,.7));
}
.footer-inner{ display:flex; align-items:center; justify-content:space-between; gap:1rem; flex-wrap:wrap; }
.brandline{ display:flex; align-items:center; gap:.5rem; font-weight:800; color:var(--text); }
.footer-nav a{ color:var(--muted); text-decoration:none; margin-right:1rem; }
.footer-nav a:hover{ color:var(--text); }
.copy{ color:var(--muted); margin:0; }

/* Motion preferences */
@media (prefers-reduced-motion:no-preference){
  .fx-gradient{ animation: float 16s ease-in-out infinite alternate; }
  @keyframes float{
    from{ transform: translateY(0px); }
    to{ transform: translateY(-20px); }
  }
}

/* Mobile menu */
@media (max-width: 960px){
  .header-inner{ grid-template-columns:auto auto auto; }
  .nav-toggle{ display:block; }
  .nav-list{
    position:absolute; top:60px; right:4%;
    background: rgba(15,21,32,.98); border:1px solid var(--border); border-radius:14px; padding:.6rem;
    display:none; flex-direction:column; min-width:200px;
  }
  .nav-list.open{ display:flex; }
}