:root {
  --bg: #0a0a0a;
  --fg: #e0e0e0;
  --accent: #6ee7b7;
  --accent-dim: #34d399;
  --muted: #888;
  --card-bg: #141414;
  --border: #222;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "SF Mono", monospace;
}

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

html {
  font-size: 18px;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.landing {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Hero */
.hero {
  text-align: center;
  padding: 6rem 0 4rem;
}

.hero h1 {
  font-family: var(--font-mono);
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.hero .dot {
  color: var(--accent);
}

.tagline {
  font-size: 1.5rem;
  color: var(--accent);
  margin-top: 0.75rem;
  font-weight: 500;
}

.subtitle {
  margin-top: 1.5rem;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.7;
}

/* Value props */
.value-props {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  padding: 2rem 0 4rem;
}

.prop {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
}

.prop h3 {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

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

/* Signup */
.signup {
  text-align: center;
  padding: 3rem 0;
  border-top: 1px solid var(--border);
}

.signup h2 {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}

.signup > p {
  color: var(--muted);
  margin-bottom: 1.5rem;
}

.signup-form {
  display: flex;
  gap: 0.5rem;
  max-width: 420px;
  margin: 0 auto;
}

.signup-form input[type="email"] {
  flex: 1;
  padding: 0.75rem 1rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--fg);
  font-size: 0.95rem;
  font-family: var(--font-sans);
  outline: none;
  transition: border-color 0.2s;
}

.signup-form input[type="email"]:focus {
  border-color: var(--accent);
}

.signup-form input[type="email"]::placeholder {
  color: #555;
}

.signup-form button {
  padding: 0.75rem 1.5rem;
  background: var(--accent);
  color: var(--bg);
  border: none;
  border-radius: 6px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
  white-space: nowrap;
}

.signup-form button:hover {
  background: var(--accent-dim);
}

.signup-form button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.signup-msg {
  margin-top: 1rem;
  font-size: 0.9rem;
  opacity: 0;
  transition: opacity 0.3s;
}

.signup-msg.show {
  opacity: 1;
}

.signup-msg.success {
  color: var(--accent);
}

.signup-msg.error {
  color: #f87171;
}

/* Footer */
.footer {
  text-align: center;
  padding: 3rem 0 2rem;
  color: var(--muted);
  font-size: 0.85rem;
}

/* Responsive */
@media (min-width: 600px) {
  .value-props {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 480px) {
  html {
    font-size: 16px;
  }

  .hero {
    padding: 4rem 0 2rem;
  }

  .hero h1 {
    font-size: 2.2rem;
  }

  .signup-form {
    flex-direction: column;
  }
}