:root {
  --color-bg: #f8f9fa;
  --color-surface: #ffffff;
  --color-primary: #4f46e5;
  --color-primary-hover: #4338ca;
  --color-text: #1f2937;
  --color-text-secondary: #6b7280;
  --color-border: #e5e7eb;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

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

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

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---- Utilities ---- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* ---- Nav ---- */
.nav {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
}

.nav-cta {
  text-decoration: none;
  display: inline-block;
}

/* ---- Buttons ---- */
.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  padding: 10px 20px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-hover);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* ---- Hero ---- */
.hero {
  text-align: center;
  padding: 80px 0 64px;
}

.hero h1 {
  font-size: 40px;
  line-height: 1.2;
  margin-bottom: 16px;
}

.hero-subtitle {
  color: var(--color-text-secondary);
  font-size: 18px;
  max-width: 560px;
  margin: 0 auto 32px;
}

/* ---- Waitlist Form ---- */
.waitlist-form {
  display: flex;
  gap: 8px;
  max-width: 420px;
  margin: 0 auto;
}

.waitlist-form input {
  flex: 1;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 10px 14px;
  font-size: 15px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.15s;
}

.waitlist-form input:focus {
  border-color: var(--color-primary);
}

.form-message {
  text-align: center;
  font-size: 14px;
  min-height: 20px;
  margin-top: 8px;
}

.form-message.success {
  color: #10b981;
}

.form-message.error {
  color: #ef4444;
}

/* ---- Features ---- */
.features {
  padding: 64px 0;
}

.section-title {
  text-align: center;
  font-size: 28px;
  margin-bottom: 40px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 32px 24px;
  text-align: center;
}

.feature-icon {
  font-size: 36px;
  margin-bottom: 12px;
}

.feature-card h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.feature-card p {
  color: var(--color-text-secondary);
  font-size: 14px;
}

.badge-pro {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 12px;
  vertical-align: middle;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

/* ---- CTA ---- */
.cta {
  background: var(--color-surface);
  padding: 64px 0;
  text-align: center;
}

.cta h2 {
  font-size: 28px;
  margin-bottom: 8px;
}

.cta p {
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}

/* ---- Footer ---- */
.footer {
  padding: 32px 0;
  text-align: center;
  color: var(--color-text-secondary);
  font-size: 14px;
}

/* ---- Responsive ---- */
@media (max-width: 640px) {
  .hero h1 {
    font-size: 28px;
  }

  .hero-subtitle {
    font-size: 16px;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

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