/* Aether Crew — public landing
   v1 2026-05-18. System fonts only, no JS, no external resources.
   Dark, infra-feel, mobile-first. Lighthouse-optimised. */

*, *::before, *::after { box-sizing: border-box; }

:root {
  --bg: #0c0f14;
  --bg-elev: #141923;
  --bg-card: #1a2030;
  --fg: #e6e9ef;
  --fg-mute: #9ba4b4;
  --fg-dim: #6e7891;
  --accent: #5dd8a7;
  --accent-soft: #2b8765;
  --border: #232a3a;
  --warn: #f5b06b;
  --max-w: 760px;
}

html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
               Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  font-size: 17px;
  line-height: 1.55;
  background: var(--bg);
  color: var(--fg);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover, a:focus { text-decoration: underline; }

.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 20px;
}

/* HEADER */
.site-header {
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand { display: flex; align-items: center; gap: 8px; color: var(--fg); }
.brand-mark {
  display: inline-block;
  width: 28px; height: 28px;
  background: var(--accent-soft);
  color: var(--bg);
  border-radius: 6px;
  text-align: center;
  font-weight: 700;
  line-height: 28px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 14px;
}
.brand-name { font-weight: 600; letter-spacing: -0.01em; }
.site-header nav { display: flex; gap: 18px; }
.site-header nav a { color: var(--fg-mute); font-size: 14px; }
.site-header nav a:hover { color: var(--fg); text-decoration: none; }

/* HERO */
.hero { padding: 64px 0 48px; }
.hero h1 {
  font-size: clamp(28px, 5vw, 44px);
  line-height: 1.15;
  margin: 0 0 24px;
  letter-spacing: -0.02em;
  font-weight: 600;
}
.hero .lede {
  font-size: 19px;
  color: var(--fg-mute);
  margin: 0 0 20px;
  max-width: 620px;
}
.hero .proof {
  font-size: 15px;
  color: var(--fg-dim);
  margin: 0 0 28px;
  padding: 14px 16px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 8px;
  max-width: 620px;
}
.cta-row { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 8px;
  font-weight: 500;
  font-size: 15px;
  border: 1px solid transparent;
  transition: background 0.12s, border-color 0.12s;
}
.btn.primary { background: var(--accent); color: var(--bg); }
.btn.primary:hover { background: #6fe3b6; text-decoration: none; }
.btn.ghost { border-color: var(--border); color: var(--fg); }
.btn.ghost:hover { border-color: var(--accent); text-decoration: none; }

/* SECTIONS */
section { padding: 56px 0; border-top: 1px solid var(--border); }
section h2 {
  font-size: clamp(22px, 3.5vw, 28px);
  margin: 0 0 28px;
  letter-spacing: -0.01em;
  font-weight: 600;
}

/* OFFER */
.offer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-bottom: 18px;
}
@media (min-width: 640px) {
  .offer-grid { grid-template-columns: 1fr 1fr; }
}
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 22px 24px;
}
.card h3 { margin: 0 0 14px; font-size: 16px; letter-spacing: 0.02em; text-transform: uppercase; color: var(--fg-mute); font-weight: 600; }
.card.included h3 { color: var(--accent); }
.card.excluded h3 { color: var(--warn); }
.card.infeasible h3 { color: var(--fg-dim); }
.card ul { margin: 0; padding-left: 20px; }
.card li { margin: 6px 0; }
.card .note {
  margin-top: 14px;
  font-size: 14px;
  color: var(--fg-dim);
  padding-top: 14px;
  border-top: 1px solid var(--border);
}

/* HOW */
.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 18px; }
.steps li {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 10px;
  padding: 20px 24px;
}
.steps h3 { margin: 0 0 8px; font-size: 17px; font-weight: 600; }
.steps p { margin: 0; color: var(--fg-mute); }

/* CONTACT */
.contact-list { list-style: none; margin: 20px 0 0; padding: 0; display: grid; gap: 10px; }
.contact-list li {
  display: flex; flex-wrap: wrap; gap: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 18px;
}
.contact-label {
  color: var(--fg-dim);
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  min-width: 90px;
}

/* FOOTER */
.site-footer {
  margin-top: 32px;
  padding: 28px 0;
  border-top: 1px solid var(--border);
  color: var(--fg-dim);
  font-size: 14px;
}
.site-footer p { margin: 0 0 6px; }
.site-footer .fine { color: var(--fg-dim); opacity: 0.7; font-size: 13px; }

/* SOURCE — informational note replacing contact section */
.source p { color: var(--fg-mute); max-width: 620px; }
.source .fine { color: var(--fg-dim); font-size: 14px; margin-top: 12px; }