/* Base Styles using Modern CSS */
:root {
  /* Dynamic Light Theme Palette */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --text-primary: #1a1a1a;
  --text-secondary: #4a5568;
  --accent-color: #2563eb;
  --accent-hover: #1d4ed8;
  --border-color: #e2e8f0;
  --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --header-height: 80px;
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

/* Dark Theme Support */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --accent-color: #3b82f6;
    --accent-hover: #60a5fa;
    --border-color: #334155;
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
  }
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Layout */
.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* Header */
header {
  position: sticky;
  top: 0;
  background-color: rgba(var(--bg-primary-rgb), 0.8);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  z-index: 100;
  display: flex;
  align-items: center;
  height: var(--header-height);
}

.header-content {
  display: flex;
  align-items: center;
  gap: 1rem;
  width: 100%;
}

.logo {
  height: 48px;
  width: auto;
  border-radius: 12px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  transition: transform 0.2s ease;
}

.logo:hover {
  transform: scale(1.05);
}

h1.app-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

/* Main Content */
main {
  padding: 4rem 0;
}

h1.page-title {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--accent-color), var(--accent-hover));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.2;
}

.last-updated {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: 3rem;
  display: block;
}

section {
  background-color: var(--bg-secondary);
  border-radius: 16px;
  padding: 2rem;
  margin-bottom: 2rem;
  border: 1px solid var(--border-color);
  box-shadow: var(--card-shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

section:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

h2 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

h2::before {
  content: '';
  display: block;
  width: 4px;
  height: 24px;
  background-color: var(--accent-color);
  border-radius: 2px;
}

p, ul {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

ul {
  padding-left: 1.5rem;
  list-style-type: none;
}

li {
  position: relative;
  margin-bottom: 0.5rem;
  padding-left: 1rem;
}

li::before {
  content: '•';
  color: var(--accent-color);
  position: absolute;
  left: -0.5rem;
  font-weight: bold;
}

/* Links */
a {
  color: var(--accent-color);
  text-decoration: none;
  font-weight: 500;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

a:hover {
  border-bottom-color: var(--accent-color);
}

/* Footer */
footer {
  margin-top: 4rem;
  border-top: 1px solid var(--border-color);
  padding: 2rem 0;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 640px) {
  .container {
    padding: 0 1.5rem;
  }
  
  h1.page-title {
    font-size: 2rem;
  }
  
  section {
    padding: 1.5rem;
  }
}

/* Animation utilities */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

main > * {
  animation: fadeIn 0.6s ease forwards;
  opacity: 0;
}

main > *:nth-child(1) { animation-delay: 0.1s; }
main > *:nth-child(2) { animation-delay: 0.2s; }
main > *:nth-child(3) { animation-delay: 0.3s; }
main > *:nth-child(4) { animation-delay: 0.4s; }
/* ... and so on */