/* ============================================
   SWISS MINIMALISM DESIGN SYSTEM
   Helvetica, Grid System (8px), Accent: #0066FF (Electric Blue)
   ============================================ */

/* ============================================
   1. DESIGN TOKENS
   ============================================ */

:root {
  /* Color Palette */
  --color-bg: #ffffff;
  --color-text-primary: #000000;
  --color-text-secondary: #555555;
  --color-text-tertiary: #888888;
  --color-divider: #e0e0e0;
  --color-accent: #0066ff;
  --color-accent-hover: #0052cc;
  --color-accent-light: #f0f5ff;

  /* Typography - Helvetica Stack */
  --font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-bold: 700;
  --font-weight-black: 900;

  /* Grid System (8px base) */
  --grid-unit: 8px;
  --spacing-xs: calc(var(--grid-unit) * 1);   /* 8px */
  --spacing-sm: calc(var(--grid-unit) * 2);   /* 16px */
  --spacing-md: calc(var(--grid-unit) * 3);   /* 24px */
  --spacing-lg: calc(var(--grid-unit) * 4);   /* 32px */
  --spacing-xl: calc(var(--grid-unit) * 6);   /* 48px */
  --spacing-2xl: calc(var(--grid-unit) * 8);  /* 64px */
  --spacing-3xl: calc(var(--grid-unit) * 12); /* 96px */

  /* Border Radius */
  --radius-none: 0;
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 8px;
  --radius-full: 50%;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   2. GLOBAL RESET & BASE
   ============================================ */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: 16px;
  font-weight: var(--font-weight-regular);
  line-height: 1.6;
  color: var(--color-text-primary);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ============================================
   3. TYPOGRAPHY
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family);
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

h1 {
  font-size: 36px;
  font-weight: var(--font-weight-black);
  margin-bottom: var(--spacing-lg);
  letter-spacing: -0.03em;
}

h2 {
  font-size: 28px;
  font-weight: var(--font-weight-black);
  margin-bottom: var(--spacing-lg);
  letter-spacing: -0.02em;
}

h3 {
  font-size: 40px;
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-md);
}

h4 {
  font-size: 28px;
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-md);
}

h5 {
  font-size: 20px;
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-sm);
}

h6 {
  font-size: 16px;
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-sm);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
  line-height: 1.8;
  max-width: 65ch;
}

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

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

a:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* ============================================
   4. CONTAINER & LAYOUT
   ============================================ */

.container {
  width: 100%;
  max-width: 1440px;
  margin: 0 auto;
  padding: var(--spacing-xl);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  justify-content: space-between;
}

/* ============================================
   HOME PAGE OVERRIDES (index.html)
   - Full-bleed entrance without boxed container
   - Lighter card treatment (no solid borders)
   ============================================ */
.home .container {
  max-width: 1100px;
  padding: var(--spacing-sm);
  margin: 0 auto;
}

.home .nav-cards {
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
  max-width: 1000px;
  margin-left: auto;
  margin-right: auto;
}


.home .intro-section {
  padding: var(--spacing-sm) 0;
  margin-bottom: var(--spacing-md);
}

.home h1 {
  font-size: 32px;
  margin-bottom: var(--spacing-sm); /* Reduced bottom margin */
}

.home .subtitle {
  font-size: 14px;
}

.home .contact-section {
  padding: var(--spacing-sm) 0;
  margin-bottom: var(--spacing-md);
}

.connect-section {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.connect-section h2 {
  font-size: 24px;
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: 0;
}

/* ============================================
   HOME - Unified 2x3 Grid for Nav + Contact
   ============================================ */
.home .home-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
  max-width: 1000px;
  margin: 0 auto var(--spacing-md);
}

/* Make the existing nav cards and contact links share the same grid when on the homepage */
.home .nav-cards,
.home .contact-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
  max-width: 1000px;
  margin: 0 auto var(--spacing-md);
}

/* Shared item style for the six tiles */
.home .card,
.home .contact-link {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  padding: var(--spacing-md);
  min-height: 100px;
  background: transparent;
  border: 1px solid rgba(0,0,0,0.06);
  border-radius: var(--radius-md);
  box-shadow: none;
  transition: all var(--transition-base);
}

.home .card:hover,
.home .contact-link:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(0,102,255,0.06);
  border-color: rgba(0,102,255,0.08);
}

.home .card h2,
.home .contact-link span {
  font-size: 16px;
  font-weight: var(--font-weight-medium);
  margin: 0;
  color: var(--color-text-primary);
}

/* icon used on nav tiles */
.home .tile-icon {
  font-size: 18px;
  color: var(--color-accent);
  margin-bottom: var(--spacing-xs);
}

/* Ensure nav card links stack icon above title and center-aligned like contact tiles */
.home .card .card-title-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: var(--spacing-xs);
}

.home .card .tile-icon,
.home .contact-link i {
  display: inline-block;
  font-size: 18px !important;
  color: var(--color-accent) !important;
  line-height: 1;
  margin-bottom: var(--spacing-xs);
}

.home .contact-link i {
  font-size: 18px;
  margin-bottom: var(--spacing-xs);
}

/* Responsive: 2 columns on medium screens, 1 column on small */
@media (max-width: 900px) {
  .home .nav-cards,
  .home .contact-links,
  .home .home-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .home .nav-cards,
  .home .contact-links,
  .home .home-grid {
    grid-template-columns: 1fr;
  }
  .home .card,
  .home .contact-link {
    min-height: 84px;
    padding: var(--spacing-sm);
  }
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-text-primary);
  color: var(--color-bg);
  padding: var(--spacing-sm);
  z-index: 100;
  text-decoration: none;
  border-radius: 0 0 var(--radius-md) 0;
  font-weight: var(--font-weight-bold);
  font-size: 14px;
}

.skip-link:focus {
  top: 0;
}

/* Main content */
.main-content {
  flex: 1;
}

/* ============================================
   5. HEADER & NAVIGATION
   ============================================ */

.header {
  margin-bottom: var(--spacing-3xl);
  padding-bottom: var(--spacing-xl);
  border-bottom: 1px solid var(--color-divider);
  text-align: center;
}

.avatar-section {
  margin-bottom: var(--spacing-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
  text-align: center;
}

.avatar {
  width: 120px;
  height: 120px;
  border-radius: var(--radius-full);
  border: 2px solid var(--color-text-primary);
  object-fit: cover;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.avatar:hover {
  transform: scale(1.08);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.12);
}

.page-title {
  font-size: 72px;
  font-weight: var(--font-weight-black);
  letter-spacing: -0.03em;
  margin: var(--spacing-lg) 0;
}

.page-title a {
  color: var(--color-text-primary);
}

.page-title a:hover {
  color: var(--color-accent);
}

.subtitle {
  font-size: 16px;
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
  letter-spacing: 0.04em;
  word-spacing: var(--spacing-md);
}

/* ============================================
   6. INTRO SECTION
   ============================================ */

.intro-section {
  margin-bottom: var(--spacing-md);
  padding: var(--spacing-md) 0;
}

.intro-section h2 {
  margin-bottom: var(--spacing-lg);
  text-align: center;
  position: relative;
  padding-bottom: var(--spacing-md);
}

.intro-section h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 2px;
  background: var(--color-accent);
  border-radius: var(--radius-md);
}

.intro-text {
  max-width: 500px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xs);
}

.intro-text p {
  font-size: 16px;
  line-height: 1.4;
  margin-bottom: 0;
  color: var(--color-text-secondary);
  padding-left: var(--spacing-md);
  border-left: 2px solid var(--color-accent);
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.intro-text p:hover {
  border-left-color: var(--color-accent-hover);
  transform: translateX(var(--spacing-sm));
}

.intro-text a {
  color: var(--color-accent);
  font-weight: var(--font-weight-bold);
}

.intro-text a:hover {
  color: var(--color-accent-hover);
}

/* ============================================
   7. NAVIGATION CARDS (Grid System)
   ============================================ */

.nav-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-lg);
  background: var(--color-bg);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  min-height: 160px;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--color-accent-light) 0%, transparent 100%);
  opacity: 0;
  transition: opacity var(--transition-base);
  pointer-events: none;
}

.card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 16px 40px rgba(0, 102, 255, 0.12);
  transform: translateY(-8px);
}

.card:hover::before {
  opacity: 1;
}

.card-icon {
  font-size: 64px;
  margin-bottom: var(--spacing-lg);
  opacity: 0.8;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.card:hover .card-icon {
  transform: scale(1.1);
  opacity: 1;
}

.card-title-link {
  width: 100%;
  text-decoration: none;
  color: var(--color-text-primary);
}

.card h2 {
  font-size: 20px;
  margin: 0;
  text-align: center;
  color: var(--color-text-primary);
}

.card-title-link:hover h2 {
  color: var(--color-accent);
}

.card-title-link:focus {
  outline: none;
}

/* ============================================
   8. CONTACT SECTION
   ============================================ */

.contact-section {
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-lg) 0;
  text-align: center;
}

.contact-section h2 {
  margin-bottom: var(--spacing-md);
}

.contact-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--spacing-md);
  max-width: 800px;
  margin: 0 auto;
}

.contact-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--color-text-primary);
  transition: all var(--transition-base);
  font-weight: var(--font-weight-medium);
}

.contact-link i {
  font-size: 20px;
  color: var(--color-accent);
  transition: transform var(--transition-base);
}

.contact-link span {
  font-size: 14px;
  color: var(--color-text-primary);
}

.contact-link:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-light);
  transform: translateY(-4px);
}

.contact-link:hover i {
  transform: scale(1.15);
}

/* ============================================
   9. FOOTER
   ============================================ */

.footer {
  text-align: center;
  padding: var(--spacing-lg) 0;
  border-top: 1px solid var(--color-divider);
  color: var(--color-text-secondary);
  margin-top: auto;
  width: 100%;
  font-size: 14px;
}

.footer p {
  max-width: none;
  margin: 0;
}

.avatar {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-full);
  border: 2px solid var(--color-text-primary);
  object-fit: cover;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.avatar:hover {
  transform: scale(1.05);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
}

/* ============================================
   10. BACK TO TOP BUTTON
   ============================================ */

#back-to-top {
  display: none;
  position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  z-index: 1000;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  background: var(--color-text-primary);
  color: var(--color-bg);
  border: none;
  cursor: pointer;
  font-size: 20px;
  transition: all var(--transition-base);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  display: none;
  align-items: center;
  justify-content: center;
}

#back-to-top:hover {
  background: var(--color-accent);
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 102, 255, 0.25);
}

#back-to-top:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

#back-to-top.show {
  display: flex;
}

/* ============================================
   11. RESPONSIVE DESIGN
   ============================================ */

/* Tablet (768px - 1024px) */
@media (max-width: 1024px) {
  .container {
    padding: var(--spacing-lg);
  }

  h1 { font-size: 56px; }
  h2 { font-size: 44px; }
  h3 { font-size: 32px; }

  .nav-cards {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-lg);
  }

  .card {
    min-height: 280px;
    padding: var(--spacing-lg);
  }

  .card h2 { font-size: 32px; }
}

/* Mobile (max-width: 768px) */
@media (max-width: 768px) {
  .container {
    padding: var(--spacing-lg);
  }

  h1 { font-size: 44px; }
  h2 { font-size: 36px; }
  h3 { font-size: 28px; }
  h4 { font-size: 24px; }

  .header {
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-lg);
  }

  .avatar {
    width: 100px;
    height: 100px;
  }

  .page-title { font-size: 44px; }
  .subtitle { font-size: 18px; }

  .nav-cards {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

  .card {
    min-height: auto;
    padding: var(--spacing-lg);
  }

  .card-icon { font-size: 48px; }
  .card h2 { font-size: 28px; }

  .intro-text {
    gap: var(--spacing-lg);
  }

  .intro-text p {
    font-size: 16px;
    padding-left: var(--spacing-md);
  }

  .contact-links {
    grid-template-columns: 1fr;
  }

  #back-to-top {
    width: 48px;
    height: 48px;
    font-size: 18px;
    bottom: var(--spacing-md);
    right: var(--spacing-md);
  }
}

/* Mobile Small (max-width: 480px) */
@media (max-width: 480px) {
  .container {
    padding: var(--spacing-md);
  }

  h1 { font-size: 36px; }
  h2 { font-size: 28px; }
  h3 { font-size: 24px; }

  .page-title { font-size: 36px; }
  .subtitle { font-size: 16px; }

  .nav-cards { gap: var(--spacing-md); }
  .card { padding: var(--spacing-md); }
  .card h2 { font-size: 24px; }
  .card-icon { font-size: 40px; }
}

/* ============================================
   12. MEDIA QUERIES - RESPONSIVE IMAGES
   ============================================ */

img, picture, video, iframe {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-lg);
}

/* ============================================
   13. UTILITY CLASSES
   ============================================ */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.text-center { text-align: center; }
.text-accent { color: var(--color-accent); }
.text-muted { color: var(--color-text-tertiary); }

.mt-xl { margin-top: var(--spacing-xl); }
.mb-xl { margin-bottom: var(--spacing-xl); }
.px-lg { padding-left: var(--spacing-lg); padding-right: var(--spacing-lg); }