*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0a0a0a;
  --fg: #f5f5f5;
  --muted: #888;
  --accent: #6366f1;
  --accent-light: #818cf8;
  --border: #1f1f1f;
  --card: #111;
}

html { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; background: var(--bg); color: var(--fg); }
body { min-height: 100vh; }

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 2rem;
  border-bottom: 1px solid var(--border);
  max-width: 1100px;
  margin: 0 auto;
}
.logo { font-weight: 700; font-size: 1.1rem; letter-spacing: -0.02em; }
.nav-link {
  font-size: 0.875rem;
  color: var(--fg);
  text-decoration: none;
  background: var(--accent);
  padding: 0.5rem 1rem;
  border-radius: 6px;
  transition: opacity 0.15s;
}
.nav-link:hover { opacity: 0.85; }
.nav-link--disabled { opacity: 0.5; cursor: not-allowed; pointer-events: none; }

.hero {
  max-width: 700px;
  margin: 0 auto;
  padding: 5rem 2rem 4rem;
  text-align: center;
}
.badge {
  display: inline-block;
  font-size: 0.75rem;
  color: var(--accent-light);
  border: 1px solid var(--accent);
  border-radius: 99px;
  padding: 0.25rem 0.75rem;
  margin-bottom: 1.5rem;
  letter-spacing: 0.03em;
}
h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
}
h1 span { color: var(--accent-light); }
.hero p {
  font-size: 1.125rem;
  color: var(--muted);
  line-height: 1.7;
  margin-bottom: 2.5rem;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}

.signup-form {
  display: flex;
  gap: 0.5rem;
  max-width: 420px;
  margin: 0 auto 1rem;
}
.signup-form input {
  flex: 1;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--fg);
  font-size: 0.9rem;
  outline: none;
}
.signup-form input:focus { border-color: var(--accent); }
.signup-form button {
  padding: 0.75rem 1.25rem;
  border-radius: 8px;
  border: none;
  background: var(--accent);
  color: white;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: opacity 0.15s;
}
.signup-form button:hover { opacity: 0.85; }
.hint { font-size: 0.8rem; color: var(--muted); }

.code-block {
  max-width: 600px;
  margin: 4rem auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  text-align: left;
}
.code-block pre {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.85rem;
  line-height: 1.7;
  color: #e2e8f0;
  overflow-x: auto;
}
.comment { color: #4a5568; }
.keyword { color: #b794f4; }
.string { color: #68d391; }
.fn { color: #63b3ed; }

.features {
  max-width: 1000px;
  margin: 2rem auto 5rem;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
}
.feature {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
}
.feature-icon { font-size: 1.5rem; margin-bottom: 0.75rem; }
.feature h3 { font-size: 1rem; font-weight: 600; margin-bottom: 0.4rem; }
.feature p { font-size: 0.875rem; color: var(--muted); line-height: 1.6; }

footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 2rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--muted);
}
footer a { color: var(--muted); text-decoration: none; }
footer a:hover { color: var(--fg); }