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

:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #dbeafe;
  --accent: #7c3aed;
  --text: #1e293b;
  --text-muted: #64748b;
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --border: #e2e8f0;
  --success: #16a34a;
  --error: #dc2626;
  --radius: 12px;
  --max-width: 1200px;
}

html {
  scroll-behavior: smooth;
}

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Navigation */
nav {
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  gap: 32px;
  align-items: center;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--primary);
}

.nav-links a.cta {
  background: var(--primary);
  color: white;
  padding: 10px 24px;
  border-radius: 8px;
  font-weight: 600;
}

.nav-links a.cta:hover {
  background: var(--primary-dark);
}

/* Hero */
.hero {
  padding: 100px 0 80px;
  text-align: center;
  background: linear-gradient(135deg, var(--primary-light) 0%, #f0f4ff 50%, var(--bg) 100%);
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -0.03em;
}

.hero h1 span {
  color: var(--primary);
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 auto 36px;
}

.hero-cta {
  display: inline-block;
  background: var(--primary);
  color: white;
  padding: 16px 40px;
  border-radius: 10px;
  font-size: 1.1rem;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.2s, transform 0.1s;
}

.hero-cta:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

/* Sections */
section {
  padding: 80px 0;
}

section:nth-child(even) {
  background: var(--bg-alt);
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 16px;
}

.section-subtitle {
  text-align: center;
  color: var(--text-muted);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto 48px;
}

/* Features */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 32px;
}

.feature-card {
  padding: 32px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: box-shadow 0.2s;
}

.feature-card:hover {
  box-shadow: 0 4px 24px rgba(0,0,0,0.06);
}

.feature-card h3 {
  font-size: 1.2rem;
  margin-bottom: 12px;
}

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

/* Newsletter Signup Form */
.newsletter-section {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  color: white;
  text-align: center;
  padding: 80px 0;
}

.newsletter-section .section-title {
  color: white;
}

.newsletter-section .section-subtitle {
  color: rgba(255,255,255,0.85);
}

.signup-form {
  display: flex;
  gap: 12px;
  max-width: 500px;
  margin: 0 auto;
  justify-content: center;
  flex-wrap: wrap;
}

.signup-form input[type="email"],
.signup-form input[type="text"] {
  flex: 1;
  min-width: 240px;
  padding: 14px 20px;
  border: 2px solid rgba(255,255,255,0.3);
  border-radius: 8px;
  font-size: 1rem;
  background: rgba(255,255,255,0.1);
  color: white;
  outline: none;
  transition: border-color 0.2s;
}

.signup-form input::placeholder {
  color: rgba(255,255,255,0.6);
}

.signup-form input:focus {
  border-color: white;
}

.signup-form button {
  padding: 14px 32px;
  border: none;
  border-radius: 8px;
  background: white;
  color: var(--primary);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.1s, box-shadow 0.2s;
}

.signup-form button:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.signup-form button:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
}

.form-message {
  margin-top: 16px;
  font-size: 0.9rem;
  min-height: 24px;
}

.form-message.success {
  color: #86efac;
}

.form-message.error {
  color: #fca5a5;
}

.form-message.loading {
  color: rgba(255,255,255,0.7);
}

/* Newsletter Page */
.newsletter-page {
  min-height: calc(100vh - 80px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
  background: linear-gradient(135deg, var(--primary-light) 0%, #f0f4ff 50%, var(--bg) 100%);
}

.newsletter-card {
  background: white;
  border-radius: 16px;
  padding: 48px;
  max-width: 520px;
  width: 100%;
  box-shadow: 0 8px 32px rgba(0,0,0,0.08);
  text-align: center;
}

.newsletter-card h1 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.newsletter-card p {
  color: var(--text-muted);
  margin-bottom: 32px;
  font-size: 1.05rem;
}

.newsletter-card .signup-form {
  flex-direction: column;
  gap: 12px;
}

.newsletter-card .signup-form input[type="email"],
.newsletter-card .signup-form input[type="text"] {
  border: 2px solid var(--border);
  background: var(--bg);
  color: var(--text);
  width: 100%;
  padding: 14px 20px;
  border-radius: 8px;
  font-size: 1rem;
  outline: none;
  transition: border-color 0.2s;
}

.newsletter-card .signup-form input::placeholder {
  color: var(--text-muted);
}

.newsletter-card .signup-form input:focus {
  border-color: var(--primary);
}

.newsletter-card .signup-form button {
  width: 100%;
  padding: 14px 32px;
  border: none;
  border-radius: 8px;
  background: var(--primary);
  color: white;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}

.newsletter-card .signup-form button:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

.newsletter-card .signup-form button:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
}

/* Footer */
footer {
  padding: 40px 0;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

footer a {
  color: var(--primary);
  text-decoration: none;
}

/* Stats Section */
.stats-section {
  text-align: center;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 800px;
  margin: 0 auto 24px;
}

.stat-card {
  padding: 32px 20px;
  border-radius: var(--radius);
  background: var(--bg);
  border: 1px solid var(--border);
}

.stat-number {
  display: block;
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 8px;
  line-height: 1.1;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.stats-source {
  font-size: 0.8rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* Audiences Section */
.audience-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.audience-card {
  padding: 36px 28px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-align: center;
  transition: box-shadow 0.2s;
}

.audience-card:hover {
  box-shadow: 0 4px 24px rgba(0,0,0,0.06);
}

.audience-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 14px;
  margin-bottom: 20px;
}

.audience-card h3 {
  font-size: 1.2rem;
  margin-bottom: 12px;
}

.audience-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

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

.testimonial-card {
  padding: 32px 28px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.testimonial-card p {
  font-size: 0.95rem;
  font-style: italic;
  line-height: 1.6;
  margin-bottom: 16px;
  color: var(--text);
}

.testimonial-card cite {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-style: normal;
}

/* About Section */
.about-text {
  max-width: 720px;
  margin: 0 auto 20px;
  color: var(--text-muted);
  font-size: 1.05rem;
  line-height: 1.7;
}

.about-text:last-of-type {
  margin-bottom: 32px;
}

.credibility-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  max-width: 700px;
  margin: 0 auto;
}

.badge {
  display: inline-block;
  padding: 10px 20px;
  border-radius: 100px;
  background: var(--primary-light);
  color: var(--primary-dark);
  font-size: 0.9rem;
  font-weight: 600;
  white-space: nowrap;
}

/* Newsletter CTA */
.newsletter-cta-section .container {
  display: flex;
  justify-content: center;
}

.newsletter-cta-card {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  color: white;
  border-radius: 20px;
  padding: 64px 48px;
  text-align: center;
  max-width: 720px;
  width: 100%;
}

.newsletter-cta-card h2 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.newsletter-cta-card p {
  color: rgba(255,255,255,0.85);
  font-size: 1.1rem;
  margin-bottom: 32px;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}

.newsletter-cta-card .btn-primary {
  background: white;
  color: var(--primary);
}

.newsletter-cta-card .btn-primary:hover {
  background: var(--primary-light);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 16px 40px;
  border-radius: 10px;
  font-size: 1.05rem;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.2s, transform 0.1s;
}

.btn-primary {
  background: var(--primary);
  color: white;
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.2rem;
  }

  .hero p {
    font-size: 1.05rem;
  }

  .nav-links {
    gap: 16px;
  }

  .nav-links a.cta {
    padding: 8px 16px;
    font-size: 0.85rem;
  }

  .newsletter-card {
    padding: 32px 24px;
  }

  .stats-grid,
  .audience-grid,
  .testimonials-grid {
    grid-template-columns: 1fr;
  }

  .stat-number {
    font-size: 2rem;
  }

  .newsletter-cta-card {
    padding: 40px 24px;
  }

  .newsletter-cta-card h2 {
    font-size: 1.5rem;
  }

  .credibility-badges {
    flex-direction: column;
    align-items: center;
  }
}