/* ==========================================================================
   Claude Mastery Lab - Main Design System Tokens & Base Styles
   Aesthetic: Warm Anthropic Dark/Terracotta Palette, Modern Glassmorphism
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600;700&family=Outfit:wght@300;400;500;600;700;800&family=Plus+Jakarta+Sans:wght@400;500;600;700&display=swap');

:root {
  /* Color Palette */
  --bg-main: #0c0e12;
  --bg-surface: #14171f;
  --bg-surface-elevated: #1a1e29;
  --bg-surface-hover: #222836;
  --bg-glass: rgba(20, 23, 31, 0.75);
  --bg-glass-card: rgba(26, 30, 41, 0.65);

  /* Anthropic Brand Accents */
  --claude-terracotta: #da7756;
  --claude-terracotta-hover: #e68868;
  --claude-terracotta-glow: rgba(218, 119, 86, 0.25);
  --claude-amber: #f59e0b;
  --claude-amber-glow: rgba(245, 158, 11, 0.2);

  /* Status & Accents */
  --accent-cyan: #38bdf8;
  --accent-green: #10b981;
  --accent-purple: #a855f7;
  --accent-rose: #f43f5e;

  /* Typography Colors */
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-dim: #475569;

  /* Borders & Dividers */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-medium: rgba(255, 255, 255, 0.14);
  --border-active: rgba(218, 119, 86, 0.45);

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 30px var(--claude-terracotta-glow);

  /* Font Families */
  --font-display: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 400ms cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  color-scheme: dark;
}

body {
  background-color: var(--bg-main);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  background-image: 
    radial-gradient(circle at 15% 10%, rgba(218, 119, 86, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 85% 85%, rgba(56, 189, 248, 0.05) 0%, transparent 40%);
  background-attachment: fixed;
}

/* Selection */
::selection {
  background: var(--claude-terracotta);
  color: #ffffff;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-main);
}
::-webkit-scrollbar-thumb {
  background: var(--bg-surface-elevated);
  border-radius: 4px;
  border: 2px solid var(--bg-main);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--claude-terracotta);
}

/* Layout Utilities */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

.text-center { text-align: center; }
.hidden { display: none !important; }

/* Header & Navigation Bar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 14px 0;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 28px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  white-space: nowrap;
  margin-right: 24px;
  flex-shrink: 0;
}

.brand-sparkle {
  color: var(--claude-terracotta);
  font-size: 1.5rem;
  animation: pulse-glow 3s infinite ease-in-out;
}

.brand-badge {
  font-size: 0.7rem;
  background: rgba(218, 119, 86, 0.15);
  color: var(--claude-terracotta);
  border: 1px solid rgba(218, 119, 86, 0.3);
  padding: 3px 10px;
  border-radius: 9999px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.nav-tabs {
  display: flex;
  gap: 6px;
  background: var(--bg-surface);
  padding: 4px;
  border-radius: 12px;
  border: 1px solid var(--border-subtle);
}

.nav-tab-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 0.88rem;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all var(--transition-fast);
}

.nav-tab-btn:hover {
  color: var(--text-primary);
  background: var(--bg-surface-elevated);
}

.nav-tab-btn.active {
  background: var(--claude-terracotta);
  color: #ffffff;
  box-shadow: 0 2px 10px var(--claude-terracotta-glow);
}

.nav-stats {
  display: flex;
  align-items: center;
  gap: 12px;
}

.stat-pill {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: 6px 14px;
  border-radius: 9999px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
}

.stat-pill span.num {
  color: var(--claude-amber);
  font-weight: 700;
}

/* Hero Section */
.hero-section {
  padding: 56px 0 40px;
  text-align: center;
  position: relative;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(218, 119, 86, 0.1);
  border: 1px solid rgba(218, 119, 86, 0.3);
  padding: 6px 16px;
  border-radius: 9999px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--claude-terracotta);
  margin-bottom: 20px;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 18px;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, #ffffff 30%, var(--claude-terracotta) 85%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 720px;
  margin: 0 auto 32px;
  font-weight: 400;
}

.hero-metrics {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-top: 24px;
}

.hero-metric-item {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-metric-val {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text-primary);
}

.hero-metric-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Animations */
@keyframes pulse-glow {
  0%, 100% { opacity: 0.8; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.1); filter: drop-shadow(0 0 8px var(--claude-terracotta)); }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
  animation: fadeIn 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* Section Header */
.section-header {
  margin-bottom: 28px;
}

.section-title {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
}