/* Tiered Storage Demo Site - Stylesheet */

:root {
  --primary-color: #3b82f6;
  --secondary-color: #8b5cf6;
  --success-color: #10b981;
  --background: #0f172a;
  --surface: #1e293b;
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --border: #334155;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--background);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header & Navigation */
header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

nav a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
}

nav a:hover,
nav a.active {
  color: var(--text);
  background: rgba(59, 130, 246, 0.1);
}

/* Main Content */
main {
  flex: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
  width: 100%;
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 4rem 2rem;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(139, 92, 246, 0.1));
  border-radius: 1rem;
  margin-bottom: 3rem;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 2rem;
}

.cta-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

.btn {
  padding: 0.75rem 2rem;
  border-radius: 0.5rem;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.2s;
  display: inline-block;
}

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

.btn-primary:hover {
  background: #2563eb;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

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

.btn-secondary:hover {
  background: var(--border);
}

/* Features */
.features {
  margin-bottom: 3rem;
}

.features h2 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: 2rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.feature-card {
  background: var(--surface);
  padding: 2rem;
  border-radius: 1rem;
  border: 1px solid var(--border);
  transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.feature-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.feature-card h3 {
  color: var(--primary-color);
  margin-bottom: 0.5rem;
}

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

/* Architecture Diagram */
.architecture {
  margin-bottom: 3rem;
}

.architecture h2 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: 2rem;
}

.tier-diagram {
  max-width: 600px;
  margin: 0 auto;
}

.tier {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: 0.5rem;
  padding: 1.5rem;
  margin-bottom: 1rem;
}

.tier.hot {
  border-color: #ef4444;
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.1), var(--surface));
}

.tier.warm {
  border-color: #f59e0b;
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.1), var(--surface));
}

.tier.cold {
  border-color: var(--primary-color);
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), var(--surface));
}

.tier-label {
  font-weight: 700;
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.tier-content {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.arrow {
  text-align: center;
  font-size: 2rem;
  color: var(--text-muted);
  margin: -0.5rem 0;
}

.diagram-note {
  text-align: center;
  color: var(--text-muted);
  font-style: italic;
  margin-top: 1rem;
}

/* Stats */
.stats {
  margin-bottom: 3rem;
}

.stats h2 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: 2rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
}

.stat-card {
  background: var(--surface);
  padding: 2rem;
  border-radius: 1rem;
  border: 1px solid var(--border);
  text-align: center;
}

.stat-value {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
}

.stat-label {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Content Pages */
.content {
  max-width: 800px;
  margin: 0 auto;
}

.content h1 {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
  color: var(--primary-color);
}

.content h2 {
  font-size: 1.8rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
}

.content h3 {
  font-size: 1.3rem;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

.content h4 {
  font-size: 1.1rem;
  margin-top: 1rem;
  margin-bottom: 0.5rem;
  color: var(--primary-color);
}

.content p {
  margin-bottom: 1rem;
  color: var(--text-muted);
}

.content ul, .content ol {
  margin-bottom: 1rem;
  margin-left: 2rem;
  color: var(--text-muted);
}

.content li {
  margin-bottom: 0.5rem;
}

.content code {
  background: var(--surface);
  padding: 0.2rem 0.5rem;
  border-radius: 0.25rem;
  font-family: 'Monaco', 'Courier New', monospace;
  font-size: 0.9em;
  color: var(--success-color);
}

.content pre {
  background: var(--surface);
  padding: 1.5rem;
  border-radius: 0.5rem;
  overflow-x: auto;
  margin-bottom: 1rem;
  border: 1px solid var(--border);
}

.content pre code {
  background: none;
  padding: 0;
  color: var(--text);
}

.solution-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.solution-item {
  background: var(--surface);
  padding: 1.5rem;
  border-radius: 0.5rem;
  border: 1px solid var(--border);
}

.solution-item h3 {
  margin-top: 0;
}

.use-cases {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-top: 2rem;
}

.use-case {
  background: var(--surface);
  padding: 1.5rem;
  border-radius: 0.5rem;
  border-left: 4px solid var(--primary-color);
}

.use-case h4 {
  margin-top: 0;
}

/* Footer */
footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 2rem;
  text-align: center;
  color: var(--text-muted);
  margin-top: auto;
}

footer p {
  margin: 0.5rem 0;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2rem;
  }

  .hero p {
    font-size: 1rem;
  }

  nav ul {
    gap: 1rem;
  }

  .feature-grid,
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .solution-grid {
    grid-template-columns: 1fr;
  }

  .cta-buttons {
    flex-direction: column;
    align-items: stretch;
  }
}