/* Apple Human Interface Guidelines inspired styles */

:root {
  /* Apple-inspired color palette */
  --color-primary: #007AFF;
  --color-primary-hover: #0056CC;
  --color-text-primary: #1D1D1F;
  --color-text-secondary: #86868B;
  --color-background: #FFFFFF;
  --color-background-secondary: #F5F5F7;
  --color-border: #E5E5E7;
  --color-accent: #FF3B30;
  
  /* Typography scale */
  --font-family-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Spacing system */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-xxl: 48px;
  --spacing-xxxl: 64px;
  
  /* Border radius */
  --border-radius-sm: 6px;
  --border-radius-md: 12px;
  --border-radius-lg: 16px;
}

/* Reset and base styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 100%;
  line-height: 1.6;
}

body {
  font-family: var(--font-family-primary);
  font-size: 17px;
  font-weight: var(--font-weight-regular);
  color: var(--color-text-primary);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1 {
  font-size: 3rem;
  font-weight: var(--font-weight-bold);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: var(--spacing-lg);
}

h2 {
  font-size: 2.25rem;
  font-weight: var(--font-weight-semibold);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin-bottom: var(--spacing-md);
}

h3 {
  font-size: 1.5rem;
  font-weight: var(--font-weight-semibold);
  line-height: 1.3;
  margin-bottom: var(--spacing-sm);
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

/* Layout */
.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-md);
  }
}

/* Navigation */
.nav {
  background-color: var(--color-background);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.nav-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) 0;
}

.nav-brand {
  font-size: 1.25rem;
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  text-decoration: none;
}

.nav-brand:hover {
  color: var(--color-text-primary);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: var(--spacing-xl);
  list-style: none;
}

.nav-links a {
  font-weight: var(--font-weight-medium);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius-sm);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.nav-links a:hover {
  background-color: var(--color-background-secondary);
  text-decoration: none;
}

@media (max-width: 768px) {
  .nav-content {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  .nav-links {
    gap: var(--spacing-md);
  }
}

/* Main content */
.main {
  padding: var(--spacing-xxxl) 0;
}

/* Hero section */
.hero {
  text-align: center;
  margin-bottom: var(--spacing-xxxl);
}

.hero h1 {
  margin-bottom: var(--spacing-lg);
}

.hero p {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto var(--spacing-xl);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 17px;
  font-weight: var(--font-weight-medium);
  text-align: center;
  text-decoration: none;
  border-radius: var(--border-radius-md);
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  color: white;
  text-decoration: none;
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: var(--color-background-secondary);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background-color: var(--color-border);
  color: var(--color-text-primary);
  text-decoration: none;
  transform: translateY(-1px);
}

/* FAQ specific styles */
.faq {
  margin-bottom: var(--spacing-xxxl);
}

.faq-item {
  margin-bottom: var(--spacing-xl);
  padding: var(--spacing-lg);
  background-color: var(--color-background-secondary);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--color-border);
}

.faq-question {
  font-size: 1.25rem;
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

.faq-answer {
  color: var(--color-text-primary);
  line-height: 1.6;
}

.faq-answer p:last-child {
  margin-bottom: 0;
}

/* Notice/Alert styles */
.notice {
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-md);
  margin-bottom: var(--spacing-xl);
  border-left: 4px solid var(--color-accent);
  background-color: #FFF5F5;
}

.notice h3 {
  color: var(--color-accent);
  margin-bottom: var(--spacing-sm);
}

/* Footer */
.footer {
  background-color: var(--color-background-secondary);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-xl) 0;
  margin-top: var(--spacing-xxxl);
}

.footer-content {
  text-align: center;
  color: var(--color-text-secondary);
  font-size: 15px;
}

/* Responsive adjustments */
@media (max-width: 768px) {
  h1 {
    font-size: 2.5rem;
  }
  
  h2 {
    font-size: 2rem;
  }
  
  .hero p {
    font-size: 1.125rem;
  }
  
  .main {
    padding: var(--spacing-xl) 0;
  }
  
  .faq-item {
    padding: var(--spacing-md);
  }
}

/* Accessibility enhancements */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus states for accessibility */
a:focus,
.btn:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --color-text-primary: #000000;
    --color-text-secondary: #333333;
    --color-border: #666666;
  }
}