/* Base styles - mobile first */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-primary: #25D366;
  --color-primary-dark: #1da851;
  --color-bg: #FAFAFA;
  --color-bg-white: #FFFFFF;
  --color-text: #1a1a1a;
  --color-text-light: #666666;
  --color-border: #e0e0e0;
  --color-success: #25D366;
  --color-error: #dc3545;
  --max-width: 1200px;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  font-size: 16px;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

h1, h2, h3, h4 {
  line-height: 1.3;
  font-weight: 600;
}

h1 {
  font-size: 2rem;
  margin-bottom: 16px;
}

h2 {
  font-size: 1.75rem;
  margin-bottom: 24px;
  text-align: center;
}

h3 {
  font-size: 1.125rem;
  margin-bottom: 8px;
}

p {
  color: var(--color-text-light);
}

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

a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
}

/* CTA Button */
.cta-button {
  display: inline-block;
  background: var(--color-primary);
  color: white;
  padding: 14px 32px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: background 0.2s ease;
}

.cta-button:hover {
  background: var(--color-primary-dark);
  text-decoration: none;
}

/* Hero Section */
.hero {
  background: var(--color-bg-white);
  padding: 48px 0;
}

.hero .container {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.hero-content {
  text-align: center;
}

.hero-subtitle {
  font-size: 1.125rem;
  margin-bottom: 24px;
  color: var(--color-text-light);
}

.trust-signals {
  margin-top: 16px;
  font-size: 0.875rem;
  color: var(--color-text-light);
}

/* Hero Carousel */
.hero-carousel {
  flex: 1;
  text-align: center;
}

.carousel-container {
  position: relative;
  overflow: hidden;
  border-radius: 12px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.1);
}

.carousel-slides {
  display: flex;
  transition: transform 0.5s ease-in-out;
}

.carousel-slide {
  min-width: 100%;
  opacity: 0;
  transition: opacity 0.5s ease-in-out;
  position: absolute;
  top: 0;
  left: 0;
}

.carousel-slide.active {
  opacity: 1;
  position: relative;
}

.carousel-slide img {
  width: 100%;
  height: auto;
  display: block;
}

.carousel-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 16px;
}

.carousel-btn {
  background: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

.carousel-btn:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
}

.carousel-btn:hover svg {
  stroke: white;
}

.carousel-btn svg {
  width: 20px;
  height: 20px;
  stroke: var(--color-text-light);
}

.carousel-dots {
  display: flex;
  gap: 8px;
}

.carousel-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: none;
  background: var(--color-border);
  cursor: pointer;
  transition: all 0.2s ease;
  padding: 0;
}

.carousel-dot.active,
.carousel-dot:hover {
  background: var(--color-primary);
}

/* Problem/Solution Section */
.problem-solution {
  padding: 60px 0;
}

.problems-grid {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.problem-card {
  background: var(--color-bg-white);
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.problem, .solution {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.problem {
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 16px;
}

.problem p {
  font-style: italic;
  color: var(--color-text);
}

.solution p {
  color: var(--color-text);
  font-weight: 500;
}

.icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  stroke: var(--color-text-light);
}

.icon-success {
  stroke: var(--color-success);
}

/* How It Works Section */
.how-it-works {
  background: var(--color-bg-white);
  padding: 60px 0;
}

.steps {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.step {
  text-align: center;
  position: relative;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--color-primary);
  color: white;
  border-radius: 50%;
  font-weight: 600;
  margin-bottom: 16px;
}

.step-icon {
  width: 48px;
  height: 48px;
  stroke: var(--color-primary);
  margin-bottom: 12px;
}

.step h3 {
  margin-bottom: 8px;
}

.step p {
  font-size: 0.9375rem;
}

/* Features Section */
.features {
  padding: 60px 0;
}

.features-grid {
  display: grid;
  gap: 24px;
}

.feature-card {
  background: var(--color-bg-white);
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.feature-icon {
  width: 40px;
  height: 40px;
  stroke: var(--color-primary);
  margin-bottom: 16px;
}

.feature-card h3 {
  color: var(--color-text);
}

/* Privacy Section */
.privacy {
  background: var(--color-bg-white);
  padding: 60px 0;
}

.privacy-grid {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.privacy-points {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.privacy-point {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.privacy-icon {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  stroke: var(--color-primary);
}

.privacy-point h3 {
  color: var(--color-text);
  margin-bottom: 4px;
}

.privacy-point p {
  font-size: 0.9375rem;
}

.privacy-diagram {
  text-align: center;
}

.privacy-diagram img {
  border-radius: 12px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.1);
}

/* Testimonials Section */
.testimonials {
  padding: 60px 0;
}

.testimonials-grid {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.testimonial {
  background: var(--color-bg-white);
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
  border-left: 4px solid var(--color-primary);
}

.testimonial p {
  color: var(--color-text);
  font-size: 1rem;
  margin-bottom: 12px;
}

.testimonial cite {
  display: block;
  font-style: normal;
  font-size: 0.875rem;
  color: var(--color-text-light);
}

/* Waitlist Section */
.waitlist {
  background: var(--color-bg-white);
  padding: 60px 0;
}

.waitlist-subtitle {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 32px;
}

.waitlist-form {
  max-width: 480px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--color-text);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 1rem;
  font-family: var(--font-family);
  transition: border-color 0.2s ease;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

.waitlist-form .cta-button {
  width: 100%;
}

.form-success {
  text-align: center;
  padding: 24px;
  background: #f0fff4;
  border-radius: 12px;
  max-width: 480px;
  margin: 0 auto;
}

.form-success svg {
  width: 48px;
  height: 48px;
  stroke: var(--color-success);
  margin-bottom: 16px;
}

.form-success p {
  color: var(--color-text);
  font-weight: 500;
}

/* FAQ Section */
.faq {
  padding: 60px 0;
}

.faq-list {
  max-width: 720px;
  margin: 0 auto;
}

.faq-item {
  background: var(--color-bg-white);
  border-radius: 12px;
  margin-bottom: 12px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.faq-item summary {
  padding: 20px 24px;
  cursor: pointer;
  font-weight: 500;
  color: var(--color-text);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: '+';
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--color-text-light);
  transition: transform 0.2s ease;
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-item p {
  padding: 0 24px 20px;
  color: var(--color-text-light);
}

/* Footer */
.footer {
  background: var(--color-text);
  color: white;
  padding: 40px 0;
  text-align: center;
}

.footer .product-name {
  font-size: 1.125rem;
  font-weight: 600;
  color: white;
  margin-bottom: 12px;
}

.footer .contact {
  margin-bottom: 12px;
  color: #cccccc;
}

.footer .contact a {
  color: var(--color-primary);
}

.footer .copyright {
  font-size: 0.875rem;
  color: #999999;
}

/* Tablet and Desktop styles */
@media (min-width: 768px) {
  h1 {
    font-size: 2.5rem;
  }

  h2 {
    font-size: 2rem;
  }

  .hero {
    padding: 80px 0;
  }

  .hero .container {
    flex-direction: row;
    align-items: center;
  }

  .hero-content {
    flex: 1;
    text-align: left;
  }

  .hero-image {
    flex: 1;
  }

  .problems-grid {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .problem-card {
    flex: 1;
    min-width: 280px;
  }

  .steps {
    flex-direction: row;
    justify-content: center;
  }

  .step {
    flex: 1;
    max-width: 280px;
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .privacy-grid {
    flex-direction: row;
    align-items: center;
  }

  .privacy-points {
    flex: 1;
  }

  .privacy-diagram {
    flex: 1;
  }

  .testimonials-grid {
    flex-direction: row;
  }

  .testimonial {
    flex: 1;
  }
}

@media (min-width: 1024px) {
  h1 {
    font-size: 3rem;
  }

  .hero {
    padding: 100px 0;
  }

  .problem-solution,
  .how-it-works,
  .features,
  .privacy,
  .testimonials,
  .waitlist,
  .faq {
    padding: 80px 0;
  }

  .features-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}