/* ==========================================================================
   Quinn Foster - Personal Website Hub Design System
   Modern, Minimalist, Responsive & Visually Striking Aesthetic
   ========================================================================== */

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

:root {
  /* Color Palette - Modern Dark Slate & Vibrant Accents */
  --bg-primary: #090d16;
  --bg-secondary: #111726;
  --surface-card: rgba(22, 30, 49, 0.65);
  --surface-card-hover: rgba(30, 41, 67, 0.8);
  --surface-border: rgba(255, 255, 255, 0.08);
  --surface-border-accent: rgba(99, 102, 241, 0.3);
  
  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  
  --accent-primary: #6366f1;
  --accent-secondary: #8b5cf6;
  --accent-teal: #14b8a6;
  --accent-amber: #f59e0b;
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
  --accent-glow: rgba(99, 102, 241, 0.25);
  
  /* Typography */
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Spacing & Sizing */
  --container-max: 1100px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  /* Animations */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 25px rgba(99, 102, 241, 0.15);
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(99, 102, 241, 0.08) 0%, transparent 45%),
    radial-gradient(circle at 85% 60%, rgba(139, 92, 246, 0.06) 0%, transparent 45%);
  background-attachment: fixed;
}

/* Typography Helpers */
h1, h2, h3, h4 {
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

p {
  color: var(--text-secondary);
  font-size: 1.05rem;
}

a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Top Navigation Bar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(9, 13, 22, 0.8);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--surface-border);
  padding: 1rem 0;
  transition: all var(--transition-normal);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text-primary);
  letter-spacing: -0.03em;
}

.brand-badge {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
  font-size: 0.95rem;
  box-shadow: 0 0 15px var(--accent-glow);
}

.nav-tabs {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  background: rgba(17, 23, 38, 0.7);
  padding: 0.35rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--surface-border);
}

.tab-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 600;
  padding: 0.55rem 1.15rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
}

.tab-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.tab-btn.active {
  color: #ffffff;
  background: var(--accent-primary);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.mobile-menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--surface-border);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

/* Main Content Area */
main {
  flex: 1;
  padding: 3rem 0 5rem 0;
}

/* Tab Panels */
.tab-panel {
  display: none;
  animation: fadeIn 0.4s ease-out forwards;
}

.tab-panel.active {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Bio / Hero Section */
.hero-section {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  margin-bottom: 3.5rem;
}

.hero-card {
  background: var(--surface-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 3rem 2.5rem;
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}

.hero-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent-gradient);
}

.bio-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
  color: var(--accent-teal);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-teal);
  box-shadow: 0 0 10px var(--accent-teal);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(1.2); }
}

.bio-title {
  font-size: 2.75rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  letter-spacing: -0.03em;
}

.bio-headline {
  font-size: 1.35rem;
  font-weight: 600;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 1.75rem;
}

.bio-text {
  font-size: 1.15rem;
  line-height: 1.8;
  color: #e5e7eb;
  margin-bottom: 2rem;
  max-width: 850px;
}

/* Tag Pills */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.5rem;
}

.tag-item {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--surface-border);
  color: var(--text-secondary);
  font-size: 0.88rem;
  font-weight: 500;
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: all var(--transition-fast);
}

.tag-item:hover {
  border-color: var(--surface-border-accent);
  color: var(--text-primary);
  background: rgba(99, 102, 241, 0.08);
}

/* Highlight Grid Cards */
.highlights-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.feature-card {
  background: var(--surface-card);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  transition: all var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--surface-border-accent);
  box-shadow: var(--shadow-glow);
  background: var(--surface-card-hover);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-primary);
  margin-bottom: 1.25rem;
  font-size: 1.4rem;
}

.feature-card h3 {
  font-size: 1.2rem;
  margin-bottom: 0.6rem;
}

.feature-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Experience Cards (Placeholders) */
.section-header {
  margin-bottom: 2rem;
}

.section-header h2 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.section-header p {
  color: var(--text-secondary);
}

.experience-card {
  background: var(--surface-card);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  margin-bottom: 1.5rem;
  position: relative;
  transition: all var(--transition-normal);
}

.experience-card:hover {
  border-color: var(--surface-border-accent);
  box-shadow: var(--shadow-card);
}

.exp-meta {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.exp-role-title {
  font-size: 1.5rem;
  font-weight: 700;
}

.exp-company {
  color: var(--accent-primary);
  font-weight: 600;
  font-size: 1.05rem;
}

.exp-date {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.05);
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
}

.exp-description {
  margin-bottom: 1.5rem;
}

.exp-description ul {
  list-style: none;
  margin-top: 0.75rem;
}

.exp-description li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.6rem;
  color: var(--text-secondary);
}

.exp-description li::before {
  content: "▹";
  position: absolute;
  left: 0;
  color: var(--accent-primary);
}

/* Footer */
footer {
  border-top: 1px solid var(--surface-border);
  padding: 2.5rem 0;
  background: rgba(9, 13, 22, 0.95);
  margin-top: auto;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.5rem;
}

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

.social-links {
  display: flex;
  gap: 1rem;
}

.social-icon {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--surface-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.social-icon:hover {
  color: var(--accent-primary);
  border-color: var(--surface-border-accent);
  background: rgba(99, 102, 241, 0.1);
  transform: translateY(-2px);
}

/* Responsive Media Queries */
@media (max-width: 768px) {
  .hero-card {
    padding: 2rem 1.5rem;
  }
  
  .bio-title {
    font-size: 2.1rem;
  }

  .bio-headline {
    font-size: 1.15rem;
  }

  .mobile-menu-toggle {
    display: flex;
  }

  .nav-tabs {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(17, 23, 38, 0.95);
    backdrop-filter: blur(20px);
    padding: 1rem;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    border-top: 1px solid var(--surface-border);
    display: none;
    box-shadow: var(--shadow-card);
  }

  .nav-tabs.open {
    display: flex;
  }

  .tab-btn {
    width: 100%;
    justify-content: center;
    padding: 0.75rem;
  }

  .footer-content {
    flex-direction: column;
    text-align: center;
  }
}