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

* {
  margin: 0;
}

body {
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
}

input,
button,
textarea,
select {
  font: inherit;
}

p,
h1,
h2,
h3,
h4,
h5,
h6 {
  overflow-wrap: break-word;
}

/* CSS Custom Properties for consistent theming */
:root {
  --color-primary-50: #f0f4ff;
  --color-primary-500: #667eea;
  --color-primary-600: #5a67d8;
  --color-primary-700: #4c51bf;
  
  --color-secondary-500: #764ba2;
  --color-secondary-600: #6b46c1;
  
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-800: #1f2937;
  --color-gray-900: #111827;
  
  --color-blue-50: #dbeafe;
  --color-blue-100: #bfdbfe;
  --color-blue-500: #3b82f6;
  
  --color-green-50: #d1fae5;
  --color-green-500: #10b981;
  
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
  
  --font-family-sans: ui-sans-serif, system-ui, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
  
  --border-radius-sm: 0.125rem;
  --border-radius-md: 0.375rem;
  --border-radius-lg: 0.5rem;
  --border-radius-xl: 0.75rem;
  --border-radius-2xl: 1rem;
  --border-radius-3xl: 1.5rem;
  --border-radius-full: 9999px;
  
  --spacing-1: 0.25rem;
  --spacing-2: 0.5rem;
  --spacing-3: 0.75rem;
  --spacing-4: 1rem;
  --spacing-6: 1.5rem;
  --spacing-8: 2rem;
  --spacing-12: 3rem;
  --spacing-16: 4rem;
  --spacing-20: 5rem;
}

/* Base styles */
body {
  font-family: var(--font-family-sans);
  line-height: 1.6;
  color: var(--color-gray-600);
  background: linear-gradient(135deg, var(--color-primary-500) 0%, var(--color-secondary-500) 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-4);
}

/* Layout components */
.container {
  background: white;
  border-radius: var(--border-radius-3xl);
  box-shadow: var(--shadow-2xl);
  padding: var(--spacing-12);
  text-align: center;
  max-width: 42rem;
  width: 100%;
}

/* Logo component */
.logo {
  width: var(--spacing-20);
  height: var(--spacing-20);
  background: linear-gradient(135deg, var(--color-primary-500), var(--color-secondary-500));
  border-radius: var(--border-radius-full);
  margin: 0 auto var(--spacing-8);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.875rem;
  font-weight: 700;
  box-shadow: 0 10px 25px rgba(102, 126, 234, 0.3);
}

/* Typography */
.title {
  font-size: clamp(2.25rem, 5vw, 3rem);
  font-weight: 300;
  color: var(--color-gray-800);
  margin-bottom: var(--spacing-6);
  letter-spacing: -0.025em;
}

.subtitle {
  font-size: 1.25rem;
  color: var(--color-gray-500);
  margin-bottom: var(--spacing-12);
  line-height: 1.75;
  max-width: 32rem;
  margin-left: auto;
  margin-right: auto;
}

/* Button component */
.btn-primary {
  display: inline-block;
  background: linear-gradient(90deg, var(--color-primary-500), var(--color-secondary-500));
  color: white;
  text-decoration: none;
  font-weight: 500;
  padding: var(--spacing-4) var(--spacing-8);
  border-radius: var(--border-radius-full);
  font-size: 1.125rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 10px 25px rgba(102, 126, 234, 0.3);
  margin-bottom: var(--spacing-16);
  border: none;
  cursor: pointer;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 20px 40px rgba(102, 126, 234, 0.4);
  background: linear-gradient(90deg, var(--color-primary-600), var(--color-secondary-600));
}

.btn-primary:focus {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}

/* Grid layouts */
.grid {
  display: grid;
}

.grid-auto-fit-12 {
  grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr));
  gap: var(--spacing-8);
}

.grid-auto-fit-16 {
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  gap: var(--spacing-6);
}

.grid-auto-fit-8 {
  grid-template-columns: repeat(auto-fit, minmax(8rem, 1fr));
  gap: var(--spacing-4);
}

/* Card components */
.card {
  border-radius: var(--border-radius-xl);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.card-feature {
  background: var(--color-gray-50);
  padding: var(--spacing-6);
}

.card-feature:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.card-info {
  padding: var(--spacing-6);
  border: 1px solid;
}

.card-info.blue {
  background: linear-gradient(90deg, var(--color-blue-50), #e0e7ff);
  border-color: #93c5fd;
}

.card-info.green {
  background: linear-gradient(90deg, var(--color-green-50), var(--color-green-50));
  border-color: #86efac;
}

.card-api {
  background: white;
  border: 1px solid var(--color-gray-200);
  padding: var(--spacing-4);
  box-shadow: var(--shadow-sm);
  text-align: center;
}

/* Icon and content styling */
.icon-lg {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-4);
}

.icon-md {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-2);
}

.icon-sm {
  width: var(--spacing-8);
  height: var(--spacing-8);
  border-radius: var(--border-radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 0.875rem;
  font-weight: 700;
  margin-right: var(--spacing-3);
  flex-shrink: 0;
}

.icon-sm.blue {
  background-color: var(--color-blue-500);
}

.icon-sm.green {
  background-color: var(--color-green-500);
}

.title-feature {
  font-weight: 600;
  color: var(--color-gray-800);
  margin-bottom: var(--spacing-2);
  font-size: 1.125rem;
}

.title-info {
  font-weight: 600;
  color: var(--color-gray-800);
}

.title-section {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-gray-800);
  margin-bottom: var(--spacing-6);
}

.desc {
  color: var(--color-gray-500);
  font-size: 0.875rem;
}

.label {
  font-weight: 500;
  color: var(--color-gray-800);
  font-size: 0.875rem;
}

/* Layout utilities */
.flex {
  display: flex;
}

.items-center {
  align-items: center;
}

.justify-center {
  justify-content: center;
}

.mb-3 {
  margin-bottom: var(--spacing-3);
}

.mb-12 {
  margin-bottom: var(--spacing-12);
}

.gap-6 {
  gap: var(--spacing-6);
}

/* Section spacing */
.section {
  margin-bottom: var(--spacing-12);
}

/* Footer */
.footer {
  padding-top: var(--spacing-8);
  border-top: 1px solid var(--color-gray-200);
}

.footer-text {
  color: var(--color-gray-400);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-4);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-6);
}

.footer-link {
  color: var(--color-gray-400);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.3s ease;
}

.footer-link:hover {
  color: var(--color-primary-500);
}

.highlight {
  color: var(--color-primary-500);
  font-weight: 500;
}

/* Responsive design */
@media (max-width: 768px) {
  .container {
    padding: var(--spacing-8);
  }
  
  .grid-auto-fit-12 {
    grid-template-columns: 1fr;
  }
  
  .grid-auto-fit-16 {
    grid-template-columns: 1fr;
  }
  
  .grid-auto-fit-8 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-links {
    flex-direction: column;
    gap: var(--spacing-3);
  }
}

@media (max-width: 480px) {
  body {
    padding: var(--spacing-2);
  }
  
  .container {
    padding: var(--spacing-6);
  }
  
  .grid-auto-fit-8 {
    grid-template-columns: 1fr;
  }
}

/* Focus and accessibility */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .card-feature {
    border: 2px solid var(--color-gray-800);
  }
}