:root {
  --bg: #f7f7fb;
  --surface: #ffffff;
  --text: #1c1c2a;
  --muted: #5c5c72;
  --accent: #4a3fbf;
  --accent-dark: #3a3199;
  --border: #e2e2ec;
  --radius: 12px;
  --maxw: 760px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f0f16;
    --surface: #17172a;
    --text: #e8e8f0;
    --muted: #a0a0ba;
    --accent: #8f86f0;
    --accent-dark: #4a3fbf;
    --border: #2a2a3c;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

.hero {
  text-align: center;
  padding: 3.5rem 1.25rem 2rem;
  max-width: var(--maxw);
  margin: 0 auto;
}

.logo { display: block; margin: 0 auto 1rem; border-radius: 20px; }

.hero h1 {
  margin: 0;
  font-size: 2.4rem;
  letter-spacing: -0.02em;
}

.tagline {
  font-size: 1.25rem;
  color: var(--accent-dark);
  font-weight: 600;
  margin: 0.35rem 0 1rem;
}

.lede {
  font-size: 1.05rem;
  color: var(--muted);
  max-width: 34rem;
  margin: 0 auto;
}

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1.25rem;
}

section { margin: 2.5rem 0; }

h2 {
  font-size: 1.5rem;
  letter-spacing: -0.01em;
  margin-bottom: 0.75rem;
}

.steps { padding-left: 1.25rem; }
.steps li { margin: 0.4rem 0; }

.note {
  color: var(--muted);
  font-size: 0.95rem;
}

/* Invitation callout (invite.html) */
.invite-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin: 1.5rem 0;
  text-align: center;
}

.invite-card .token {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.85rem;
  color: var(--muted);
  word-break: break-all;
  margin-top: 0.75rem;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  margin: 1.25rem 0 0.5rem;
}

.apk-btn {
  display: inline-block;
  margin: 0.5rem 0 1rem;
  padding: 0.8rem 1.5rem;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  text-decoration: none;
  border-radius: var(--radius);
  transition: background 0.15s ease, transform 0.15s ease;
}

.apk-btn:hover {
  background: var(--accent-dark);
  transform: translateY(-2px);
}

.btn-secondary {
  display: inline-block;
  padding: 0.8rem 1.5rem;
  background: transparent;
  color: var(--accent-dark);
  font-weight: 700;
  text-decoration: none;
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.btn-secondary:hover { transform: translateY(-2px); }

@media (prefers-color-scheme: dark) {
  .apk-btn { color: #131033; }
  .btn-secondary { color: var(--accent); }
}

footer {
  max-width: var(--maxw);
  margin: 3rem auto 2rem;
  padding: 1.5rem 1.25rem 0;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
}

a { color: var(--accent-dark); }
@media (prefers-color-scheme: dark) { a { color: var(--accent); } }