:root {
  --bg: #ffffff;
  --text: #0b1320;
  --muted: #5b6b7a;
  --brand: #10B981;
  --brand-2: #0EA5E9;
  --brand-dark: #0f7b3b;
  --surface: #f6f9fb;
  --card: #ffffff;
  --ring: rgba(16, 185, 129, 0.4);
  --border: #e6edf2;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
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;
}

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px;
}

.skip-link {
  position: absolute; left: -999px; top: auto; width: 1px; height: 1px; overflow: hidden;
}
.skip-link:focus { position: static; width: auto; height: auto; padding: 8px; background: var(--brand); color: #fff; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,0.85);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: inherit; font-weight: 700; }
.brand-text { letter-spacing: -0.2px; }
.brand-sub { color: var(--muted); font-weight: 600; font-size: 12px; margin-left: 6px; }
.brand-mark { display: inline-flex; }

.site-nav ul { list-style: none; margin: 0; padding: 0; display: flex; gap: 12px; align-items: center; }
.site-nav a { text-decoration: none; color: var(--text); font-weight: 600; padding: 8px 10px; border-radius: 8px; }
.site-nav a:hover { background: var(--surface); }

.nav-toggle { display: inline-flex; flex-direction: column; gap: 4px; background: none; border: none; padding: 10px; border-radius: 10px; }
.nav-toggle .bar { width: 22px; height: 2px; background: var(--text); display: block; }

@media (max-width: 880px) {
  .site-nav { position: fixed; inset: 64px 0 auto 0; background: rgba(255,255,255,0.98); border-bottom: 1px solid var(--border); transform: translateY(-120%); transition: transform 240ms ease; }
  .site-nav.open { transform: translateY(0%); }
  .site-nav ul { flex-direction: column; padding: 16px; gap: 2px; }
  .nav-toggle { display: inline-flex; }
}
@media (min-width: 881px) { .nav-toggle { display: none; } }

/* Sections */
.section { padding: 72px 0; }
.section h2 { font-size: 28px; line-height: 1.2; margin: 0 0 16px; letter-spacing: -0.4px; }
.section-lead, .lead { color: var(--muted); }
.lead { font-size: 18px; }

/* Hero */
.hero { background: radial-gradient(1200px 480px at 70% -10%, rgba(16,185,129,.15), transparent 60%), radial-gradient(1000px 500px at -10% 10%, rgba(14,165,233,.14), transparent 60%); }
.hero-inner { display: grid; gap: 28px; align-items: center; grid-template-columns: 1fr; }
.hero h1 { font-size: 34px; line-height: 1.1; letter-spacing: -0.8px; margin: 0 0 12px; }
.cta-row { display: flex; gap: 12px; margin: 18px 0; flex-wrap: wrap; }
.trust-row { display: flex; align-items: center; gap: 8px; color: var(--muted); font-weight: 600; }
.divider { opacity: .4; }
.hero-art { display: grid; place-items: center; }
.network-mock { width: 100%; max-width: 560px; height: auto; }

/* Grids */
.grid { display: grid; gap: 18px; }
.grid.two { grid-template-columns: 1fr; }
.grid.three { grid-template-columns: 1fr; }
.grid.four { grid-template-columns: 1fr 1fr; }

@media (min-width: 720px) {
  .hero-inner { grid-template-columns: 1.1fr .9fr; }
  .grid.two { grid-template-columns: 1.1fr .9fr; }
  .grid.three { grid-template-columns: repeat(3, 1fr); }
  .grid.four { grid-template-columns: repeat(4, 1fr); }
  .section h2 { font-size: 32px; }
  .hero h1 { font-size: 44px; }
}

/* Cards, buttons */
.card { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 18px; box-shadow: 0 8px 24px rgba(2, 36, 32, 0.04); }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 10px 16px; border-radius: 12px; font-weight: 700; text-decoration: none; border: 1px solid transparent; cursor: pointer; }
.btn-primary { background: linear-gradient(90deg, var(--brand), var(--brand-2)); color: #fff; }
.btn-primary:hover { filter: brightness(0.98); }
.btn-ghost { background: #ffffff; border-color: var(--border); color: var(--text); }
.btn-ghost:hover { background: var(--surface); }
.btn-block { width: 100%; }

.kv { display: grid; gap: 18px; }
.kv > div { background: var(--surface); border: 1px dashed var(--border); border-radius: 12px; padding: 14px; }

.features .feature .icon { width: 48px; height: 48px; display: grid; place-items: center; border-radius: 12px; background: #f0fdf4; border: 1px solid #dcfce7; margin-bottom: 10px; }

.impact-note { margin-top: 14px; background: #f0f9ff; border-color: #dbeafe; }

.stats .stat { text-align: center; }
.stat-number { font-size: 28px; font-weight: 800; color: var(--brand-dark); letter-spacing: -0.6px; }
.stat-label { color: var(--muted); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: 0.6px; }

.steps { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
.steps .step { width: 28px; height: 28px; border-radius: 10px; background: linear-gradient(90deg, var(--brand), var(--brand-2)); color: #fff; display: inline-grid; place-items: center; font-weight: 800; margin-right: 10px; }
.steps li { display: grid; grid-template-columns: 28px 1fr; gap: 10px; align-items: start; }

.checklist { padding-left: 18px; }
.checklist li { margin-bottom: 6px; }

.flywheel { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 8px; margin-top: 10px; }
.flywheel span { text-align: center; background: #ecfeff; border: 1px solid #e0f2fe; border-radius: 10px; padding: 10px 8px; font-weight: 700; font-size: 12px; }

.contact-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.contact-card { display: grid; place-items: center; border: 1px solid var(--border); border-radius: 12px; padding: 12px; text-decoration: none; color: var(--text); background: var(--card); }
.contact-card:hover { background: var(--surface); }
.contact-card .emoji { font-weight: 800; }

.contact-form .field { margin-bottom: 12px; }
.contact-form label { display: block; font-weight: 700; font-size: 12px; margin-bottom: 6px; }
.contact-form input, .contact-form select { width: 100%; padding: 12px 12px; border: 1px solid var(--border); border-radius: 10px; background: #fff; font: inherit; }
.contact-form input:focus, .contact-form select:focus { outline: none; box-shadow: 0 0 0 4px var(--ring); border-color: var(--brand); }
.contact-form .error { display: block; min-height: 18px; color: #b91c1c; font-size: 12px; }
.fineprint { color: var(--muted); font-size: 12px; margin-top: 6px; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); background: var(--surface); color: var(--text); }
.footer-inner { display: grid; gap: 12px; align-items: center; padding: 18px 0; grid-template-columns: 1fr; }
.footer-brand { display: flex; gap: 10px; align-items: center; }
.footer-links { display: flex; gap: 12px; flex-wrap: wrap; }
.footer-links a { text-decoration: none; color: var(--muted); font-weight: 700; }
.footer-links a:hover { color: var(--text); }
.footer-meta { color: var(--muted); font-size: 12px; }

@media (min-width: 720px) {
  .footer-inner { grid-template-columns: 1fr auto auto; }
}

/* Utilities */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

/* Buttons within nav on mobile */
.site-nav .btn { margin: 6px 0; }