/* ── Reset & Base ─────────────────────────────────────────── */

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

body {
  background: #0d1117;
  color: #c9d1d9;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
}

/* ── Layout ──────────────────────────────────────────────── */

main {
  width: 100%;
  max-width: 640px;
  text-align: center;
}

/* ── Heading ─────────────────────────────────────────────── */

.heading {
  font-size: 3.5rem;
  font-weight: 700;
  color: #00d4ff;
  letter-spacing: 0.08em;
  margin-bottom: 0.25rem;
}

.subtitle {
  font-size: 1.15rem;
  color: #8b949e;
  margin-bottom: 2.5rem;
}

/* ── Value Prop ──────────────────────────────────────────── */

.value-prop {
  font-size: 1.05rem;
  line-height: 1.7;
  color: #8b949e;
  margin-bottom: 1.25rem;
  padding: 0 1rem;
}

.value-prop.highlight {
  color: #e6edf3;
  font-weight: 600;
  font-size: 1.15rem;
  margin-bottom: 1.25rem;
}

/* ── Badge ───────────────────────────────────────────────── */

.badge {
  display: inline-block;
  border: 1.5px solid #00d4ff;
  border-radius: 999px;
  padding: 0.5rem 1.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: #00d4ff;
  margin-bottom: 2rem;
}

/* ── Form ────────────────────────────────────────────────── */

#signup-form {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

#signup-form input {
  width: 100%;
  padding: 0.95rem 1rem;
  background: #161b22;
  border: 1px solid #30363d;
  border-radius: 8px;
  color: #c9d1d9;
  font-size: 1rem;
  outline: none;
  transition: border-color 0.2s;
}

#signup-form input::placeholder {
  color: #6e7681;
}

#signup-form input:focus {
  border-color: #00d4ff;
}

#signup-form input.error {
  border-color: #f85149;
}

#signup-form button {
  width: 100%;
  padding: 1rem;
  background: #00d4ff;
  color: #0d1117;
  border: none;
  border-radius: 8px;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: opacity 0.2s;
  margin-top: 0.25rem;
}

#signup-form button:hover {
  opacity: 0.9;
}

#signup-form button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ── Form Message ────────────────────────────────────────── */

.form-message {
  margin-top: 1rem;
  font-size: 0.95rem;
  min-height: 1.4em;
}

.form-message.success {
  color: #3fb950;
}

.form-message.error {
  color: #f85149;
}

/* ── Responsive ──────────────────────────────────────────── */

@media (max-width: 480px) {
  .heading {
    font-size: 2.5rem;
  }

  .subtitle {
    font-size: 1rem;
  }

  .value-prop {
    font-size: 0.95rem;
    padding: 0;
  }

  .badge {
    font-size: 0.75rem;
    padding: 0.4rem 1.1rem;
  }
}