/* ========================================
   RESET & BASE
   ======================================== */

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

:root {
  /* Colors */
  --primary: #f38020;
  --primary-dark: #d16d1a;
  --secondary: #1e40af;
  --bg-dark: #0f172a;
  --bg-light: #f8fafc;
  --text-dark: #1e293b;
  --text-light: #64748b;
  --border: #e2e8f0;
  --success: #10b981;
  --error: #ef4444;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  
  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --font-mono: 'Courier New', monospace;
}

body {
  font-family: var(--font-sans);
  line-height: 1.6;
  color: var(--text-dark);
  background: var(--bg-light);
}

/* ========================================
   LAYOUT
   ======================================== */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* ========================================
   HEADER
   ======================================== */

.header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  padding: var(--spacing-xl) 0;
  text-align: center;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.subtitle {
  font-size: 1.1rem;
  opacity: 0.9;
}

/* ========================================
   MAIN SECTIONS
   ======================================== */

main {
  padding: var(--spacing-xl) 0;
}

section {
  margin-bottom: var(--spacing-xl);
}

h2 {
  font-size: 2rem;
  margin-bottom: var(--spacing-md);
  color: var(--text-dark);
}

h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-md);
  color: var(--text-dark);
}

h4 {
  font-size: 1.2rem;
  margin-bottom: var(--spacing-sm);
  color: var(--primary);
}

/* ========================================
   HERO
   ======================================== */

.hero {
  background: white;
  padding: var(--spacing-xl);
  border-radius: 12px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  text-align: center;
}

.hero p {
  font-size: 1.1rem;
  color: var(--text-light);
  max-width: 800px;
  margin: 0 auto;
}

/* ========================================
   GRID & CARDS
   ======================================== */

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.card {
  background: white;
  padding: var(--spacing-lg);
  border-radius: 12px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

.card ul {
  list-style: none;
  margin-top: var(--spacing-sm);
}

.card li {
  padding: var(--spacing-xs) 0;
  color: var(--text-light);
  border-bottom: 1px solid var(--border);
}

.card li:last-child {
  border-bottom: none;
}

.card li::before {
  content: "✓ ";
  color: var(--success);
  font-weight: bold;
  margin-right: var(--spacing-xs);
}

/* ========================================
   FEATURES
   ======================================== */

.feature-list {
  display: grid;
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.feature-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  background: white;
  padding: var(--spacing-lg);
  border-radius: 12px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.icon {
  font-size: 2.5rem;
  flex-shrink: 0;
}

.feature-item h4 {
  margin-bottom: var(--spacing-xs);
}

.feature-item p {
  color: var(--text-light);
}

/* ========================================
   API DEMO
   ======================================== */

.api-demo {
  background: white;
  padding: var(--spacing-lg);
  border-radius: 12px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  margin-top: var(--spacing-md);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

code {
  background: var(--bg-dark);
  color: #10b981;
  padding: var(--spacing-sm);
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  display: block;
  overflow-x: auto;
}

.btn-primary {
  background: var(--primary);
  color: white;
  border: none;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: 6px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
}

.btn-primary:active {
  transform: translateY(0);
}

.api-result {
  margin-top: var(--spacing-md);
  padding: var(--spacing-md);
  background: var(--bg-dark);
  color: #10b981;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  white-space: pre-wrap;
  max-height: 400px;
  overflow-y: auto;
  display: none;
}

.api-result.show {
  display: block;
}

/* ========================================
   LINKS
   ======================================== */

.link-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.link-card {
  background: white;
  padding: var(--spacing-lg);
  border-radius: 12px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  text-decoration: none;
  color: var(--text-dark);
  font-weight: 600;
  transition: transform 0.2s, box-shadow 0.2s, color 0.2s;
  text-align: center;
}

.link-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
  color: var(--primary);
}

/* ========================================
   FOOTER
   ======================================== */

.footer {
  background: var(--bg-dark);
  color: white;
  padding: var(--spacing-xl) 0;
  text-align: center;
  margin-top: var(--spacing-xl);
}

.footer p {
  margin-bottom: var(--spacing-sm);
  opacity: 0.9;
}

/* ========================================
   RESPONSIVE
   ======================================== */

@media (max-width: 768px) {
  .header h1 {
    font-size: 1.8rem;
  }
  
  h2 {
    font-size: 1.5rem;
  }
  
  .grid {
    grid-template-columns: 1fr;
  }
  
  .link-list {
    grid-template-columns: 1fr;
  }
}