:root {
  --bg: #0d1117;
  --panel: #161b22;
  --line: #262d36;
  --text: #e6edf3;
  --muted: #8b949e;
  --up: #3fb950;
  --down: #f85149;
  --accent: #e6edf3;
}

* { box-sizing: border-box; }

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

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 720px;
  margin: 0 auto;
  padding: 20px 24px;
}

.brand {
  font-weight: 700;
  letter-spacing: 0.02em;
  display: flex;
  align-items: center;
  gap: 10px;
}

.tick {
  width: 10px;
  height: 22px;
  background: linear-gradient(180deg, var(--up) 0 50%, var(--down) 50% 100%);
  border-radius: 2px;
  display: inline-block;
}

.pill {
  font-size: 12px;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px 24px 64px;
}

.hero { padding: 48px 0 40px; }

.hero h1 {
  font-size: clamp(38px, 7vw, 60px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 20px;
}

.lede {
  font-size: 18px;
  color: var(--muted);
  max-width: 560px;
  margin: 0 0 28px;
}

.lede strong { color: var(--text); }

.btn {
  display: inline-block;
  background: var(--text);
  color: #0d1117;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  padding: 12px 24px;
  font-size: 16px;
  cursor: pointer;
  text-decoration: none;
  transition: opacity 0.15s ease;
}

.btn:hover { opacity: 0.88; }
.btn:disabled { opacity: 0.55; cursor: default; }

.rules { padding: 32px 0; border-top: 1px solid var(--line); }

.rules h2, .beta h2 {
  font-size: 22px;
  margin: 0 0 20px;
  letter-spacing: -0.01em;
}

.rules ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.rules li {
  display: flex;
  gap: 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 18px;
}

.rules .n {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  color: var(--muted);
  font-size: 14px;
  padding-top: 2px;
}

.rules strong { display: block; margin-bottom: 2px; }
.rules div { color: var(--muted); }
.rules div strong { color: var(--text); }

.beta {
  padding: 32px 0;
  border-top: 1px solid var(--line);
}

.beta p { color: var(--muted); margin: 0 0 24px; max-width: 520px; }

form { display: grid; gap: 16px; max-width: 440px; }

.field { display: grid; gap: 6px; }

.field span { font-size: 14px; color: var(--muted); }
.field em { font-style: normal; opacity: 0.7; }

.field input {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text);
  padding: 12px 14px;
  font-size: 16px;
  width: 100%;
}

.field input:focus {
  outline: none;
  border-color: var(--up);
}

.hp {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.form-note { font-size: 14px; min-height: 22px; margin: 4px 0 0; }
.form-note.ok { color: var(--up); }
.form-note.err { color: var(--down); }

footer {
  border-top: 1px solid var(--line);
  max-width: 720px;
  margin: 0 auto;
  padding: 24px;
}

footer p {
  font-size: 13px;
  color: var(--muted);
  margin: 0;
}

@media (max-width: 520px) {
  .hero { padding: 32px 0; }
}