/* ─────────────────────────────────────────────────────────────────
   BTP portal — connect.html stylesheet
   Palette aligned with the main index.html CSS variables so the two
   pages feel like one site.
   ───────────────────────────────────────────────────────────────── */
:root {
  --bg-0: #06080b;
  --bg-1: #0a0d12;
  --bg-2: #0f1218;
  --bg-3: #161a22;
  --line-1: rgba(255,255,255,.05);
  --line-2: rgba(255,255,255,.10);
  --line-3: rgba(255,255,255,.16);
  --text-1: #e6e9ee;
  --text-2: #98a0ad;
  --text-3: #5a6271;
  --acc:     #00ffa1;
  --acc-dim: #00b873;
  --acc-soft: rgba(0,255,161,.06);
  --amber:   #ffb547;
  --mono:    ui-monospace, "SF Mono", "Cascadia Code", "JetBrains Mono",
             Menlo, Consolas, "Liberation Mono", monospace;
  --sans:    system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue",
             "Noto Sans", sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg-0); color: var(--text-1); }
body {
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a       { color: var(--acc); text-decoration: none; }
a:hover { color: #4dffc7; text-decoration: underline; }
code    {
  font-family: var(--mono);
  background: var(--bg-2);
  padding: .1rem .45rem;
  border-radius: 3px;
  color: var(--acc);
  font-size: .92em;
  border: 1px solid var(--line-1);
}

/* ── HEADER ─────────────────────────────────────────────────────── */
header {
  position: sticky; top: 0; z-index: 50;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 24px;
  background: rgba(6,8,11,.85);
  backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--line-1);
  gap: 14px;
  flex-wrap: wrap;
}
header .brand {
  font-family: var(--mono);
  color: var(--text-1);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: .04em;
  display: flex; align-items: center; gap: 10px;
}
header .brand::before {
  content: '';
  display: inline-block;
  width: 18px; height: 18px;
  background: var(--acc);
  border-radius: 3px;
  transform: rotate(45deg);
}
header nav { display: flex; gap: 4px; flex-wrap: wrap; }
header nav a {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-2);
  letter-spacing: .04em;
  padding: 6px 10px;
  border-radius: 4px;
}
header nav a:hover { color: var(--acc); background: var(--acc-soft); text-decoration: none; }

/* ── MAIN ───────────────────────────────────────────────────────── */
main {
  flex: 1 1 auto;
  max-width: 820px;
  margin: 0 auto;
  padding: 56px 24px 56px;
  width: 100%;
}

.hero { padding: 0 0 32px; }
.hero h1 {
  margin: 0 0 14px;
  font-size: clamp(28px, 4.5vw, 38px);
  font-family: var(--sans);
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--text-1);
  line-height: 1.15;
}
.hero h1 code.small {
  font-size: .55em;
  vertical-align: middle;
  padding: 6px 12px;
  background: var(--bg-2);
  border: 1px solid var(--line-1);
  border-radius: 6px;
  color: var(--acc);
}
.hero .tagline {
  color: var(--text-2);
  font-size: 16px;
  max-width: 60ch;
  margin: 0;
  line-height: 1.6;
}

/* ── CARDS ──────────────────────────────────────────────────────── */
.card {
  background: var(--bg-1);
  border: 1px solid var(--line-1);
  border-radius: 12px;
  padding: 28px 32px;
  margin: 20px 0;
  transition: border-color .2s;
}
.card:hover { border-color: var(--line-2); }
.card.subtle {
  background: transparent;
  border-style: dashed;
  border-color: var(--line-2);
  color: var(--text-2);
}
.card h2 {
  color: var(--acc);
  margin: 0 0 14px;
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -.01em;
  font-family: var(--sans);
}
.card h3 {
  color: var(--amber);
  margin: 22px 0 10px;
  font-size: 14px;
  font-weight: 600;
  font-family: var(--mono);
  letter-spacing: .02em;
}
.card p { margin: 10px 0; color: var(--text-2); line-height: 1.7; }
.card pre {
  background: var(--bg-0);
  border: 1px solid var(--line-1);
  border-radius: 8px;
  padding: 14px 18px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.55;
  margin: 14px 0;
  color: var(--text-1);
  white-space: pre-wrap;
  word-break: break-word;
}
.card pre code {
  background: transparent;
  padding: 0;
  border: 0;
  color: inherit;
  font-size: inherit;
}

/* ── ENDPOINT TABLE (used for any key:value lists) ─────────────── */
dl.endpoint {
  margin: 14px 0;
  display: grid;
  grid-template-columns: max-content 1fr;
  column-gap: 24px;
  row-gap: 6px;
  font-size: 13px;
}
dl.endpoint dt {
  color: var(--text-3);
  text-transform: uppercase;
  font-size: 10px;
  letter-spacing: .08em;
  font-family: var(--mono);
  align-self: center;
}
dl.endpoint dd {
  margin: 0;
  word-break: break-all;
  font-family: var(--mono);
  color: var(--text-1);
}
dl.endpoint code {
  background: var(--bg-0);
  border: 1px solid var(--line-1);
  padding: 4px 10px;
  display: inline-block;
  color: var(--text-1);
}
dl.endpoint .fingerprint { color: var(--acc); font-size: 11.5px; }

/* ── CTA ────────────────────────────────────────────────────────── */
.cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  padding: 10px 18px;
  border-radius: 6px;
  background: var(--acc);
  color: var(--bg-0) !important;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
}
.cta:hover {
  background: #4dffc7;
  text-decoration: none;
  color: var(--bg-0) !important;
  box-shadow: 0 6px 24px rgba(0,255,161,.15);
}

.muted { color: var(--text-3); font-size: 13px; }

/* ── FOOTER ─────────────────────────────────────────────────────── */
footer {
  background: var(--bg-1);
  border-top: 1px solid var(--line-1);
  padding: 32px 24px 28px;
  text-align: center;
  color: var(--text-3);
  font-size: 12px;
  font-family: var(--mono);
  line-height: 1.7;
}
footer p { margin: 6px 0; }
footer a { color: var(--text-2); }
footer a:hover { color: var(--acc); }
footer .muted { color: var(--text-3); }

/* ── RESPONSIVE ─────────────────────────────────────────────────── */
@media (max-width: 720px) {
  main { padding: 36px 18px 40px; }
  .card { padding: 22px 20px; }
  .hero h1 { font-size: clamp(24px, 7vw, 30px); }
  .hero .tagline { font-size: 14.5px; }
  dl.endpoint {
    grid-template-columns: 1fr;
    row-gap: 2px;
  }
  dl.endpoint dt { margin-top: 8px; }
}

@media (max-width: 480px) {
  header { padding: 12px 16px; gap: 8px; }
  header nav a { padding: 5px 8px; font-size: 10.5px; }
  main { padding: 28px 14px 32px; }
  .card { padding: 18px 16px; margin: 14px 0; }
  .card pre { padding: 12px 14px; font-size: 11.5px; }
  .card h2 { font-size: 16px; }
  footer { padding: 24px 16px 22px; font-size: 11px; }
}