/* Modern CSS Reset and Base Styles */
*, *::before, *::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: #1a1a1a;
  background-color: #ffffff;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
}

h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.875rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1.125rem; }

p {
  margin-bottom: 1rem;
  color: #4a4a4a;
}

/* Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header and Navigation */
header {
  background-color: #ffffff;
  border-bottom: 1px solid #e5e5e5;
  position: sticky;
  top: 0;
  z-index: 100;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 0;
}

.logo {
  font-size: 1.75rem;
  font-weight: 800;
  text-decoration: none;
  color: #1a1a1a;
  letter-spacing: -0.025em;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-links a {
  text-decoration: none;
  color: #4a4a4a;
  font-weight: 500;
  transition: color 0.2s ease;
  padding: 0.5rem 0;
}

.nav-links a:hover,
.nav-links a.active {
  color: #1a1a1a;
}

/* Main Content */
main {
  flex: 1;
}

/* Hero Section */
.hero {
  padding: 6rem 0;
  text-align: center;
  background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
}

.hero h1 {
  margin-bottom: 1.5rem;
  font-size: clamp(2.5rem, 5vw, 4rem);
}

.hero p {
  font-size: 1.25rem;
  color: #6b7280;
  max-width: 600px;
  margin: 0 auto 2rem;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.875rem 2rem;
  background-color: #1a1a1a;
  color: #ffffff;
  text-decoration: none;
  border-radius: 0.5rem;
  font-weight: 600;
  transition: all 0.2s ease;
  border: none;
  cursor: pointer;
  font-size: 1rem;
}

.btn:hover {
  background-color: #374151;
  transform: translateY(-1px);
}

.btn-outline {
  background-color: transparent;
  color: #1a1a1a;
  border: 2px solid #1a1a1a;
}

.btn-outline:hover {
  background-color: #1a1a1a;
  color: #ffffff;
}

/* Grid System */
.grid {
  display: grid;
  gap: 2rem;
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
}

/* Cards */
.card {
  background: #ffffff;
  border: 1px solid #e5e5e5;
  border-radius: 0.75rem;
  padding: 2rem;
  transition: all 0.2s ease;
  height: 100%;
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.card-header {
  margin-bottom: 1rem;
}

.card-title {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.card-description {
  color: #6b7280;
  flex-grow: 1;
  margin-bottom: 1.5rem;
}

.card-footer {
  margin-top: auto;
}

/* Sections */
.section {
  padding: 4rem 0;
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-header h2 {
  margin-bottom: 1rem;
}

.section-header p {
  font-size: 1.125rem;
  color: #6b7280;
  max-width: 600px;
  margin: 0 auto;
}

/* Forms */
.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: #374151;
}

.form-input {
  width: 100%;
  padding: 0.875rem 1rem;
  border: 1px solid #d1d5db;
  border-radius: 0.5rem;
  font-size: 1rem;
  transition: border-color 0.2s ease;
}

.form-input:focus {
  outline: none;
  border-color: #1a1a1a;
  box-shadow: 0 0 0 3px rgba(26, 26, 26, 0.1);
}

textarea.form-input {
  resize: vertical;
  min-height: 120px;
}

/* Footer */
footer {
  background-color: #f8f9fa;
  border-top: 1px solid #e5e5e5;
  padding: 3rem 0;
  margin-top: 4rem;
}

.footer-content {
  text-align: center;
  color: #6b7280;
}

/* Product Page Specific */
.product-hero {
  padding: 3rem 0;
}

.product-images {
  margin-bottom: 2rem;
}

.product-image {
  width: 100%;
  max-width: 500px;
  height: auto;
  border-radius: 0.75rem;
  border: 1px solid #e5e5e5;
}

.product-info h1 {
  margin-bottom: 1rem;
}

.product-price {
  font-size: 2rem;
  font-weight: 700;
  color: #1a1a1a;
  margin-bottom: 1.5rem;
}

.product-description {
  margin-bottom: 2rem;
}

.stripe-buy-button {
  margin-top: 2rem;
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 0 1rem;
  }
  
  .nav-links {
    gap: 1rem;
  }
  
  .hero {
    padding: 4rem 0;
  }
  
  .section {
    padding: 3rem 0;
  }
  
  .grid {
    gap: 1.5rem;
  }
  
  .grid-3 {
    grid-template-columns: 1fr;
  }
  
  .grid-2 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .nav-links {
    gap: 0.75rem;
  }
  
  .nav-links a {
    font-size: 0.9rem;
  }
  
  .btn {
    padding: 0.75rem 1.5rem;
    font-size: 0.9rem;
  }
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

/* Logo Animation */
@keyframes logoColorFade {
  0% {
    filter: invert(0);
  }
  50% {
    filter: invert(1);
  }
  100% {
    filter: invert(0);
  }
}

.logo-animated {
  animation: logoColorFade 7s ease-in-out infinite;
}

.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.mb-5 { margin-bottom: 2rem; }

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.mt-5 { margin-top: 2rem; }