/* ==============================================
   ANTHROPIC DESIGN SYSTEM
   Reusable CSS components and variables
   ============================================== */

/* Color Palette - Based on Anthropic's brand colors */
:root {
  /* Primary Colors */
  --anthropic-primary: #D4A574;        /* Warm tan/beige - Anthropic's signature color */
  --anthropic-primary-light: #E4C5A4;  /* Lighter variant */
  --anthropic-primary-dark: #B48754;   /* Darker variant */
  
  /* Background Colors */
  --bg-dark: #191817;                  /* Deep charcoal */
  --bg-dark-secondary: #2A2928;        /* Slightly lighter charcoal */
  --bg-light: #FEFDFB;                 /* Off-white/cream */
  --bg-card: #FFFFFF;                  /* Pure white for cards */
  --bg-card-hover: #FAF9F7;           /* Subtle hover state */
  
  /* Text Colors */
  --text-primary: #191817;             /* Main text on light backgrounds */
  --text-secondary: #605F5E;           /* Secondary text */
  --text-light: #FEFDFB;               /* Text on dark backgrounds */
  --text-muted: #8B8A89;              /* Muted text */
  
  /* Accent Colors */
  --accent-warm: #DC8850;              /* Warm orange accent */
  --accent-cool: #7C9885;              /* Cool sage green */
  --accent-neutral: #A8A5A0;           /* Neutral gray-beige */
  
  /* Status Colors */
  --success: #7C9885;                  /* Sage green */
  --warning: #DC8850;                  /* Warm orange */
  --error: #C45D5D;                    /* Muted red */
  --info: #6B8E9F;                     /* Dusty blue */
  
  /* Metric Colors */
  --metric-low: #7C9885;               /* Good/Low - Sage green */
  --metric-medium: #DC8850;            /* Medium - Warm orange */
  --metric-high: #C45D5D;              /* High/Alert - Muted red */
  
  /* Gradients */
  --gradient-dark: linear-gradient(135deg, var(--bg-dark) 0%, var(--bg-dark-secondary) 100%);
  --gradient-warm: linear-gradient(135deg, var(--anthropic-primary) 0%, var(--accent-warm) 100%);
  --gradient-subtle: linear-gradient(135deg, var(--bg-light) 0%, #F5F3F0 100%);
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 20px;
  --radius-full: 50px;
  
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(25, 24, 23, 0.05);
  --shadow-md: 0 4px 15px rgba(25, 24, 23, 0.08);
  --shadow-lg: 0 10px 40px rgba(25, 24, 23, 0.1);
  --shadow-xl: 0 20px 60px rgba(25, 24, 23, 0.15);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;
}

/* ==============================================
   BASE STYLES
   ============================================== */

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

body {
  font-family: var(--font-family);
  background: var(--gradient-dark);
  min-height: 100vh;
  color: var(--text-primary);
  line-height: 1.6;
}

/* ==============================================
   TYPOGRAPHY COMPONENTS
   ============================================== */

.heading-1 {
  font-size: 3rem;
  font-weight: 800;
  color: var(--text-light);
  margin-bottom: var(--spacing-md);
  text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
}

.heading-2 {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--text-light);
  margin-bottom: var(--spacing-sm);
}

.heading-3 {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text-light);
}

.heading-4 {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text-primary);
}

.subtitle {
  font-size: 1.25rem;
  color: var(--text-light);
  opacity: 0.9;
  font-weight: 300;
  margin-bottom: var(--spacing-xl);
}

.subtitle-section {
  font-size: 0.95rem;
  opacity: 0.9;
  margin-top: var(--spacing-sm);
}

/* ==============================================
   CONTAINER COMPONENTS
   ============================================== */

.container {
  max-width: 1200px;
  margin: 0 auto;
  background: rgba(255, 255, 255, 0.98);
}

.container-narrow {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--spacing-2xl) var(--spacing-lg);
}

.section {
  width: 100%;
  background: var(--bg-card);
}

.content {
  padding: var(--spacing-2xl);
  min-height: 500px;
}

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

.main-header {
  background: var(--gradient-dark);
  color: var(--text-light);
  padding: var(--spacing-xl);
  text-align: center;
  border-bottom: 3px solid var(--anthropic-primary);
}

.section-header {
  background: linear-gradient(135deg, var(--bg-dark-secondary) 0%, #3A3938 100%);
  color: var(--text-light);
  padding: var(--spacing-lg) var(--spacing-2xl);
  border-bottom: 2px solid var(--anthropic-primary);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
}

.header-left {
  flex: 1;
  min-width: 300px;
}

/* ==============================================
   NAVIGATION COMPONENTS
   ============================================== */

.nav-home {
  background: rgba(212, 165, 116, 0.1);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-xl);
  border: 1px solid rgba(212, 165, 116, 0.3);
  text-decoration: none;
  color: var(--anthropic-primary);
  font-size: 0.9em;
  font-weight: 500;
  transition: all var(--transition-base);
}

.nav-home:hover {
  background: rgba(212, 165, 116, 0.2);
  transform: translateY(-1px);
}

/* ==============================================
   BUTTON & LINK COMPONENTS
   ============================================== */

.btn-primary {
  display: inline-block;
  background: var(--anthropic-primary);
  color: var(--bg-dark);
  padding: 0.75rem 2rem;
  border-radius: var(--radius-full);
  text-decoration: none;
  font-weight: 600;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-md);
}

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

.btn-outline {
  display: inline-block;
  background: transparent;
  color: var(--anthropic-primary);
  padding: 10px 20px;
  border: 2px solid var(--anthropic-primary);
  border-radius: var(--radius-xl);
  text-decoration: none;
  font-weight: 600;
  transition: all var(--transition-base);
}

.btn-outline:hover {
  background: var(--anthropic-primary);
  color: var(--bg-dark);
}

.cta {
  background: rgba(212, 165, 116, 0.08);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  border: 1px solid rgba(212, 165, 116, 0.3);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.cta-label {
  font-size: 0.85em;
  opacity: 0.8;
  margin-bottom: 3px;
  color: var(--text-light);
}

.cta-link {
  color: var(--anthropic-primary);
  text-decoration: none;
  font-weight: 600;
  font-size: 1.1em;
  transition: opacity var(--transition-fast);
}

.cta-link:hover {
  opacity: 0.8;
}

/* ==============================================
   CARD COMPONENTS
   ============================================== */

.card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-2px);
}

.card-list {
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-lg);
}

.card-item {
  padding: var(--spacing-xl) 0;
  border-bottom: 1px solid rgba(168, 165, 160, 0.2);
  transition: all var(--transition-base);
}

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

.card-item:hover {
  padding-left: var(--spacing-md);
}

.card-link {
  text-decoration: none;
  color: inherit;
  display: block;
}

.card-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
  transition: color var(--transition-fast);
}

.card-item:hover .card-title {
  color: var(--anthropic-primary-dark);
}

.card-description {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--spacing-md);
}

/* ==============================================
   TABLE COMPONENTS
   ============================================== */

.table-wrapper {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  background: var(--bg-card);
}

thead {
  background: linear-gradient(135deg, var(--bg-dark-secondary) 0%, #3A3938 100%);
  color: var(--text-light);
}

th {
  padding: var(--spacing-md);
  text-align: left;
  font-weight: 600;
  font-size: 0.95em;
  letter-spacing: 0.5px;
}

td {
  padding: var(--spacing-md);
  border-bottom: 1px solid rgba(168, 165, 160, 0.15);
  font-size: 0.9em;
}

tbody tr {
  transition: all var(--transition-base);
}

tbody tr:hover {
  background: var(--bg-card-hover);
}

.technique-name {
  font-weight: 600;
  color: var(--text-primary);
}

.description {
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ==============================================
   METRIC COMPONENTS
   ============================================== */

.metric {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-xl);
  font-weight: 500;
  font-size: 0.85em;
}

.metric.low,
.complexity-low,
.cost-low,
.latency-low,
.accuracy-high {
  background: rgba(124, 152, 133, 0.15);
  color: var(--metric-low);
}

.metric.medium,
.complexity-medium,
.cost-medium,
.latency-medium,
.accuracy-medium {
  background: rgba(220, 136, 80, 0.15);
  color: var(--metric-medium);
}

.metric.high,
.complexity-high,
.cost-high,
.latency-high,
.accuracy-low {
  background: rgba(196, 93, 93, 0.15);
  color: var(--metric-high);
}

/* ==============================================
   TAG COMPONENTS
   ============================================== */

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.tag {
  background: var(--gradient-warm);
  color: var(--text-light);
  padding: var(--spacing-xs) 0.75rem;
  border-radius: var(--radius-xl);
  font-size: 0.85rem;
  font-weight: 500;
}

/* ==============================================
   INSIGHT/CALLOUT COMPONENTS
   ============================================== */

.insights {
  padding: var(--spacing-lg);
  background: var(--bg-card-hover);
  border-radius: var(--radius-lg);
  border-left: 4px solid var(--anthropic-primary);
  margin-top: var(--spacing-xl);
}

.insights h3 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
  font-size: 1.3em;
}

.insights ul {
  list-style: none;
  padding-left: 0;
}

.insights li {
  padding: var(--spacing-sm) 0;
  padding-left: var(--spacing-lg);
  position: relative;
  line-height: 1.6;
  color: var(--text-secondary);
}

.insights li:before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--anthropic-primary);
  font-weight: bold;
}

/* ==============================================
   CODE BLOCK COMPONENTS
   ============================================== */

.code-block {
  background: var(--bg-card-hover);
  border: 1px solid rgba(168, 165, 160, 0.2);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  margin: var(--spacing-lg) 0;
  font-family: var(--font-mono);
  font-size: 0.85em;
  overflow-x: auto;
}

.code-title {
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

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

.footer {
  background: var(--gradient-dark);
  color: var(--text-light);
  padding: var(--spacing-2xl);
  text-align: center;
}

.footer h3 {
  color: var(--anthropic-primary);
  margin-bottom: var(--spacing-md);
}

.footer p {
  opacity: 0.8;
  margin-bottom: var(--spacing-lg);
  color: var(--text-light);
}

.footer a {
  color: var(--anthropic-primary);
  text-decoration: none;
}

/* ==============================================
   LEGEND COMPONENTS
   ============================================== */

.legend {
  display: flex;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-md);
  background: var(--bg-card-hover);
  border-radius: var(--radius-md);
  flex-wrap: wrap;
  font-size: 0.9em;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.legend-title {
  font-weight: 600;
  margin-right: var(--spacing-xs);
}

/* ==============================================
   UTILITY CLASSES
   ============================================== */

.arrow {
  display: inline-block;
  margin-left: var(--spacing-sm);
  transition: transform var(--transition-fast);
}

.card-item:hover .arrow {
  transform: translateX(5px);
}

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

@media (max-width: 768px) {
  .heading-1 {
    font-size: 2rem;
  }
  
  .heading-2 {
    font-size: 1.8rem;
  }
  
  .heading-3 {
    font-size: 1.4rem;
  }
  
  .subtitle {
    font-size: 1rem;
  }
  
  .container-narrow {
    padding: var(--spacing-lg) var(--spacing-md);
  }
  
  .content {
    padding: var(--spacing-lg);
  }
  
  .header-content {
    flex-direction: column;
    text-align: center;
  }
  
  .card-list {
    padding: var(--spacing-lg);
  }
  
  .card-item {
    padding: var(--spacing-lg) 0;
  }
  
  .card-title {
    font-size: 1.25rem;
  }
  
  table {
    font-size: 0.85em;
  }
  
  th, td {
    padding: var(--spacing-sm);
  }
}