:root {
  --color-primary: #4F46E5;
  --color-primary-hover: #4338CA;
  --color-secondary: #0F172A;
  --color-background: #FFFFFF;
  --color-surface: #F8FAFC;
  --color-text: #1E293B;
  --color-text-muted: #64748B;
  --color-border: #E2E8F0;
  --color-success: #10B981;
  --font-family: 'Inter', system-ui, -apple-system, sans-serif;
  --section-padding: 80px 32px;
  --section-padding-mobile: 48px 16px;
  --card-padding: 24px;
  --card-gap: 24px;
  --element-gap: 16px;
  --radius-card: 12px;
  --radius-button: 8px;
  --shadow-card: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-card-hover: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);
  --shadow-button: 0 1px 2px rgba(0,0,0,0.05);
}

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

body {
  font-family: var(--font-family);
  color: var(--color-text);
  background: var(--color-background);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

.header {
  height: 64px;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  padding: 0 32px;
  background: var(--color-background);
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-inner {
  max-width: 1120px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-wordmark {
  font-weight: 700;
  font-size: 20px;
  color: var(--color-secondary);
  letter-spacing: -0.02em;
}

.tagline {
  font-size: 14px;
  color: var(--color-text-muted);
  font-weight: 400;
}

.hero {
  padding: var(--section-padding);
  text-align: center;
}

.hero-inner {
  max-width: 640px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--element-gap);
}

.hero-headline {
  font-size: 48px;
  font-weight: 700;
  line-height: 56px;
  color: var(--color-secondary);
  letter-spacing: -0.02em;
}

.hero-subheadline {
  font-size: 18px;
  line-height: 28px;
  color: var(--color-text-muted);
  max-width: 480px;
  margin: 0 auto;
}

.email-form {
  width: 100%;
  max-width: 480px;
}

.email-form-row {
  display: flex;
  gap: 12px;
  width: 100%;
}

.email-input {
  flex: 1;
  height: 48px;
  padding: 0 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-button);
  font-size: 16px;
  font-family: var(--font-family);
  color: var(--color-text);
  background: var(--color-background);
  outline: none;
  transition: border-color 0.2s;
}

.email-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(79,70,229,0.15);
}

.email-input::placeholder {
  color: var(--color-text-muted);
}

.cta-button {
  height: 48px;
  padding: 0 24px;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-button);
  font-size: 16px;
  font-weight: 600;
  font-family: var(--font-family);
  cursor: pointer;
  box-shadow: var(--shadow-button);
  transition: background 0.2s, transform 0.1s;
  white-space: nowrap;
}

.cta-button:hover {
  background: var(--color-primary-hover);
}

.cta-button:active {
  transform: scale(0.98);
}

.cta-button:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.form-error {
  color: #DC2626;
  font-size: 14px;
  margin-top: 8px;
  min-height: 20px;
}

.success-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 24px;
}

.success-icon {
  width: 48px;
  height: 48px;
}

.success-message {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-success);
}

.social-proof {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 20px;
}

.social-proof strong {
  color: var(--color-secondary);
  font-weight: 700;
}

.demo-section {
  padding: 0 32px 80px;
}

.demo-inner {
  max-width: 1120px;
  margin: 0 auto;
}

.demo-placeholder {
  max-width: 600px;
  margin: 0 auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-surface);
  padding: 48px 32px;
  text-align: center;
}

.demo-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
}

.demo-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.demo-step-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
}

.demo-arrow {
  flex-shrink: 0;
}

.features-section {
  padding: var(--section-padding);
  background: var(--color-surface);
}

.features-inner {
  max-width: 1120px;
  margin: 0 auto;
}

.section-heading {
  font-size: 32px;
  font-weight: 600;
  line-height: 40px;
  color: var(--color-secondary);
  text-align: center;
  margin-bottom: 48px;
  letter-spacing: -0.01em;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--card-gap);
}

.feature-card {
  background: var(--color-background);
  border-radius: var(--radius-card);
  padding: var(--card-padding);
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.2s;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.feature-card:hover {
  box-shadow: var(--shadow-card-hover);
}

.feature-icon {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
}

.feature-title {
  font-size: 18px;
  font-weight: 600;
  line-height: 24px;
  color: var(--color-secondary);
}

.feature-body {
  font-size: 14px;
  line-height: 22px;
  color: var(--color-text-muted);
}

.trust-bar {
  background: var(--color-secondary);
  padding: 48px 32px;
}

.trust-inner {
  max-width: 1120px;
  margin: 0 auto;
  display: flex;
  justify-content: center;
  gap: 48px;
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-size: 14px;
  font-weight: 500;
}

.trust-icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}

.footer {
  border-top: 1px solid var(--color-border);
  padding: 32px;
  background: var(--color-background);
}

.footer-inner {
  max-width: 1120px;
  margin: 0 auto;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-privacy {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 20px;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 24px;
  font-size: 14px;
}

.footer-links a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
  transition: opacity 0.2s;
}

.footer-links a:hover {
  opacity: 0.8;
}

.footer-links a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 2px;
}

@media (max-width: 767px) {
  .header {
    padding: 0 16px;
  }

  .hero {
    padding: var(--section-padding-mobile);
  }

  .hero-headline {
    font-size: 32px;
    line-height: 40px;
  }

  .hero-subheadline {
    font-size: 16px;
    line-height: 24px;
  }

  .email-form-row {
    flex-direction: column;
  }

  .cta-button {
    width: 100%;
  }

  .demo-section {
    padding: 0 16px 48px;
  }

  .demo-flow {
    flex-direction: column;
    gap: 16px;
  }

  .demo-arrow svg {
    transform: rotate(90deg);
  }

  .features-section {
    padding: var(--section-padding-mobile);
  }

  .section-heading {
    font-size: 24px;
    line-height: 32px;
    margin-bottom: 32px;
  }

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

  .trust-bar {
    padding: 32px 16px;
  }

  .trust-inner {
    flex-direction: column;
    align-items: center;
    gap: 20px;
  }

  .footer {
    padding: 24px 16px;
  }

  .footer-links {
    flex-direction: column;
    gap: 12px;
  }
}