/* SkyFi marketing & support site
   Dark navy + cyan, system fonts, mobile-first. */

:root {
  --bg: #0a0e1c;
  --surface: #131a2e;
  --surface-hi: #1a233d;
  --border: rgba(40, 200, 240, 0.18);
  --text: #ffffff;
  --text-dim: #aab4c9;
  --text-muted: #7c8aa3;
  --accent: #5edcff;
  --accent-deep: #28c8f0;
  --accent-glow: rgba(40, 200, 240, 0.22);
  --violet: #b66cff;
  --maxw: 760px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI",
               Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.6;
  font-size: 17px;
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s ease;
}
a:hover { border-bottom-color: var(--accent); }

/* ---- Layout ---- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

header.site {
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, #0a0e1c 0%, #0d1224 100%);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: saturate(140%) blur(8px);
}

header.site .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 18px;
  padding-bottom: 18px;
}

.brand {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-weight: 900;
  letter-spacing: 0.18em;
  color: var(--accent);
  font-size: 18px;
  border: 0;
}

.brand .sep { color: var(--text-muted); margin: 0 6px; font-weight: 400; }

nav.site a {
  color: var(--text-dim);
  font-size: 15px;
  margin-left: 22px;
  border: 0;
}
nav.site a:hover { color: var(--accent); }
nav.site a.active { color: var(--text); }

main { padding: 56px 0 80px; }

/* ---- Hero ---- */
.hero {
  text-align: center;
  padding: 60px 0 30px;
}
.hero h1 {
  font-size: 44px;
  line-height: 1.1;
  margin: 0 0 16px;
  background: linear-gradient(135deg, #5edcff 0%, #b66cff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero .tagline {
  font-size: 19px;
  color: var(--text-dim);
  margin: 0 auto 24px;
  max-width: 540px;
}

/* ---- Content sections ---- */
h2 {
  font-size: 24px;
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
h3 {
  font-size: 18px;
  color: var(--accent);
  margin: 28px 0 10px;
  font-weight: 600;
}
p { color: var(--text-dim); margin: 0 0 14px; }
ul, ol { color: var(--text-dim); padding-left: 22px; }
li { margin: 6px 0; }
strong { color: var(--text); font-weight: 600; }
code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: var(--surface);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--accent);
}

/* ---- Cards ---- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px 24px;
  margin: 18px 0;
}
.card.accent {
  background: linear-gradient(135deg, var(--surface) 0%, var(--surface-hi) 100%);
  box-shadow: 0 0 0 1px var(--border), 0 24px 64px -32px var(--accent-glow);
}

.card h3:first-child { margin-top: 0; }

/* ---- Feature grid ---- */
.features {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 30px 0;
}
@media (min-width: 640px) {
  .features { grid-template-columns: 1fr 1fr; }
}

/* ---- FAQ ---- */
details.faq {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 18px;
  margin: 12px 0;
  cursor: pointer;
}
details.faq[open] { border-color: var(--accent-deep); }
details.faq summary {
  font-weight: 600;
  color: var(--text);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
details.faq summary::-webkit-details-marker { display: none; }
details.faq summary::after {
  content: "+";
  color: var(--accent);
  font-size: 22px;
  line-height: 1;
}
details.faq[open] summary::after { content: "−"; }
details.faq .body { padding-top: 14px; }
details.faq p:last-child { margin-bottom: 0; }

/* ---- CTA buttons ---- */
.btn {
  display: inline-block;
  padding: 12px 22px;
  background: var(--accent-deep);
  color: #00111a;
  font-weight: 700;
  border-radius: 999px;
  border: 0;
  margin: 6px 4px;
  letter-spacing: 0.02em;
}
.btn:hover { background: var(--accent); border: 0; }
.btn.ghost {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent-deep);
}
.btn.ghost:hover { background: var(--accent-glow); }

/* ---- Footer ---- */
footer.site {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  color: var(--text-muted);
  font-size: 14px;
  text-align: center;
  background: #080b16;
}
footer.site a { color: var(--text-dim); border: 0; }
footer.site a:hover { color: var(--accent); }

/* ---- Misc ---- */
.meta {
  font-size: 13px;
  color: var(--text-muted);
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  letter-spacing: 0.04em;
}
.pill {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--accent-glow);
  color: var(--accent);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  text-transform: uppercase;
}
hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 32px 0;
}