/* atnetwork one-page site • 2025-10-04 */
:root {
  --primary: #0EA5A0;
  --primary-dark: #0B7C78;
  --secondary: #2563EB;
  --accent: #F59E0B;
  --ink: #0F172A;
  --ink-soft: #334155;
  --paper: #F8FAFC;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  color: var(--ink);
  background: linear-gradient(135deg, #ffffff 0%, #f5fbff 40%, #f6fff8 100%);
}
/* Dark mode */
@media (prefers-color-scheme: dark) {
  body { background: radial-gradient(1000px 600px at 20% -10%, #0b1324, #0b1220 40%, #05060a 100%); color: #e5e7eb; }
  .card { background: rgba(255,255,255,0.06); backdrop-filter: blur(8px); border: 1px solid rgba(255,255,255,0.08);}
  .muted { color: #94a3b8; }
}

.container { max-width: 1120px; margin: 0 auto; padding: 24px; }
.nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 0;
}
.nav a { text-decoration: none; color: inherit; opacity: .9; }
.logo-wrap { display: flex; align-items: center; gap: 12px; }
.logo-wrap img { height: 36px; width: auto; }
.badge { font-size: 12px; padding: 4px 10px; border-radius: 999px; background: linear-gradient(90deg, var(--secondary), var(--primary)); color: white; display: inline-block; }
.btn {
  appearance: none; border: none; padding: 14px 20px; border-radius: 14px; cursor: pointer;
  background: linear-gradient(90deg, var(--secondary), var(--primary)); color: white; font-weight: 700;
  transition: transform .2s ease, box-shadow .2s ease; box-shadow: 0 8px 24px rgba(0,0,0,.15);
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 12px 26px rgba(0,0,0,.18);}
.btn.alt { background: none; color: var(--secondary); border: 2px solid var(--secondary); }
.hero {
  display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 24px; align-items: center;
  padding: 48px 0 24px;
}
h1 { font-size: clamp(34px, 4.5vw, 56px); line-height: 1.1; margin: 0 0 16px; }
h2 { font-size: clamp(22px, 2.6vw, 34px); margin: 0 0 12px; }
p.large { font-size: clamp(16px, 1.6vw, 18px); opacity: .9; }
.hero-art {
  position: relative; min-height: 320px; border-radius: 24px; overflow: hidden;
  background: radial-gradient(800px 400px at 100% 0%, rgba(37,99,235,.22), rgba(14,165,160,.22) 35%, transparent 60%),
              conic-gradient(from 180deg at 60% 40%, rgba(14,165,160,.35), rgba(245,158,11,.35), rgba(37,99,235,.35), rgba(14,165,160,.35));
  backdrop-filter: blur(10px);
  border: 1px solid rgba(0,0,0,.06);
  box-shadow: 0 20px 60px rgba(2,6,23,.10);
}
.sparkle { position: absolute; inset: 0; background: radial-gradient(120px 120px at 30% 70%, rgba(14,165,160,.35), transparent 60%),
            radial-gradient(160px 160px at 80% 30%, rgba(37,99,235,.35), transparent 60%); filter: blur(12px); }
.stats { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 16px; margin-top: 24px; }
.card { background: rgba(255,255,255,.8); border: 1px solid rgba(2,6,23,.06); border-radius: 18px; padding: 18px; }
.card h3 { margin: 0 0 8px; font-size: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 18px; }
.section { padding: 48px 0; }
.kicker { text-transform: uppercase; letter-spacing: .16em; font-weight: 800; color: var(--secondary); font-size: 12px; }
.muted { color: #475569; }
.footer { padding: 28px 0 42px; font-size: 14px; color: #64748b; border-top: 1px dashed rgba(2,6,23,.12); }
.tags span { display:inline-block; margin-right:8px; margin-bottom:8px; background: #eef2ff; color:#1e40af; padding:6px 10px; border-radius: 999px; font-size:12px; }
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; }
  .grid-3 { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr; }
}
.toggle {
  display:flex; align-items:center; gap:8px; font-size:12px; cursor:pointer; user-select:none;
}
.toggle input { width: 40px; height: 22px; -webkit-appearance: none; appearance: none; background: #cbd5e1; border-radius: 999px; position: relative; outline: none; transition: background .2s ease; }
.toggle input:checked { background: linear-gradient(90deg, var(--secondary), var(--primary)); }
.toggle input::after { content: ""; position: absolute; top: 3px; left: 3px; width: 16px; height: 16px; border-radius: 50%; background: white; transition: transform .2s ease; }
.toggle input:checked::after { transform: translateX(18px); }
.dark body { background: #0b1220; color: #e5e7eb; }
.form { display:flex; gap:12px; flex-wrap:wrap; }
.input, textarea { flex:1; padding:14px 16px; border-radius:12px; border:1px solid rgba(2,6,23,.10); outline:none; }
textarea { min-height: 120px; resize: vertical; }
small.note { color:#64748b; }