:root {
  --bg: #0f1410;
  --bg-2: #182019;
  --ink: #e8f0e9;
  --muted: #9bb0a0;
  --accent: #3dd68c;
  --accent-ink: #062416;
  --danger: #ff7b72;
  --line: #2a3a2f;
  --radius: 14px;
  --font: "Segoe UI", "IBM Plex Sans", sans-serif;
  --mono: "Cascadia Mono", "Consolas", monospace;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, #1d3b2a 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, #243448 0%, transparent 50%),
    var(--bg);
}

.shell {
  width: min(640px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 3rem 0 4rem;
}

.brand { margin-bottom: 1.75rem; }
.logo {
  margin: 0;
  font-size: clamp(2rem, 5vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.03em;
}
.tagline { margin: 0.4rem 0 0; color: var(--muted); }

.panel {
  background: color-mix(in srgb, var(--bg-2) 88%, black);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem;
  backdrop-filter: blur(8px);
}

.tabs { display: flex; gap: 0.5rem; margin-bottom: 1rem; }
.tab, button {
  font: inherit;
  cursor: pointer;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #223028;
  color: var(--ink);
  padding: 0.65rem 0.95rem;
}
.tab.active, button[type="submit"], #pairing-btn {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: transparent;
  font-weight: 600;
}
button.ghost { background: transparent; }
button.danger { color: var(--danger); border-color: color-mix(in srgb, var(--danger) 40%, var(--line)); }

.form { display: grid; gap: 0.85rem; }
.form.inline { grid-template-columns: 1fr auto; align-items: end; }
label { display: grid; gap: 0.35rem; font-size: 0.92rem; color: var(--muted); }
input {
  font: inherit;
  color: var(--ink);
  background: #0c110e;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.7rem 0.8rem;
}
.hidden { display: none !important; }
.row { display: flex; align-items: center; }
.row.between { justify-content: space-between; }
.row.gap { gap: 0.6rem; flex-wrap: wrap; margin-top: 1rem; }
.block { margin-top: 1.25rem; padding-top: 1.25rem; border-top: 1px solid var(--line); }
.block:first-child { margin-top: 0.5rem; }
.muted { color: var(--muted); }
.strong { font-weight: 600; margin: 0.15rem 0 0; }
.error { color: var(--danger); margin-top: 0.85rem; }
.meta { display: grid; gap: 0.65rem; margin: 0.75rem 0 0; }
.meta div { display: grid; grid-template-columns: 8rem 1fr; gap: 0.5rem; }
.meta dt { color: var(--muted); }
.meta dd { margin: 0; word-break: break-all; }
.meta a { color: var(--accent); }
.pairing {
  margin-top: 1rem;
  padding: 1rem;
  border-radius: 12px;
  background: #101812;
  border: 1px dashed color-mix(in srgb, var(--accent) 45%, var(--line));
}
.code {
  font-family: var(--mono);
  font-size: 2rem;
  letter-spacing: 0.35em;
  margin: 0.4rem 0;
}
code { font-family: var(--mono); color: var(--accent); }