/* Modern Homepage CSS with OKLCH Color System and Unique Visual Identity */

:root {
  /* neutrals */
  --ink-0: #ffffff;
  --ink-1: oklch(0.98 0.01 250);
  --ink-2: oklch(0.95 0.02 250);
  --ink-8: oklch(0.35 0.02 250);
  --ink-10: oklch(0.20 0.02 250);
  --bg: var(--ink-0);
  --fg: var(--ink-10);
  /* Increased contrast for muted text on light background */
  --muted: oklch(0.38 0.03 250);

  /* core pastels (L≈0.9, C≈0.07–0.10) */
  --pastel-pink: oklch(0.92 0.09 18);
  --pastel-peach: oklch(0.93 0.09 60);
  --pastel-yellow: oklch(0.94 0.08 95);
  --pastel-mint: oklch(0.93 0.08 155);
  --pastel-sky: oklch(0.93 0.09 220);
  --pastel-lilac: oklch(0.92 0.09 300);

  /* enhanced contrast pastels (for better readability) */
  --pastel-pink-contrast: oklch(0.88 0.12 18);
  --pastel-peach-contrast: oklch(0.89 0.12 60);
  --pastel-yellow-contrast: oklch(0.90 0.11 95);
  --pastel-mint-contrast: oklch(0.89 0.11 155);
  --pastel-sky-contrast: oklch(0.89 0.12 220);
  --pastel-lilac-contrast: oklch(0.88 0.12 300);

  /* semantic */
  --accent: var(--pastel-sky-contrast);
  --accent-ink: color-mix(in oklch, var(--accent) 30%, black);
  --card: color-mix(in oklch, var(--accent) 8%, white);
  --focus-ring: color-mix(in oklch, var(--accent) 60%, white);
  --wash: color-mix(in oklch, var(--accent) 15%, white);
  --radius: 14px;
  --ease: cubic-bezier(.2,.7,.2,1);

  /* typography */
  --font-system: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
}

[data-theme="ink"] { 
  --bg: #0c0f13; 
  --fg: #e8edf2; 
  /* Stronger contrast for muted on dark background */
  --muted: oklch(0.80 0.03 250); 
  --card: color-mix(in oklch, var(--accent) 8%, #0c0f13);
}

/* Reset and base styles */
html, body { 
  height: 100%; 
  background: var(--bg); 
  color: var(--fg);
  font-family: var(--font-system);
  line-height: 1.6;
  margin: 0;
  padding: 0;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

/* Layout Structure */
.shell { 
  display: grid; 
  grid-template-columns: minmax(300px, 34%) 1fr; 
  gap: 3rem; 
  align-items: start;
  min-height: 100vh;
}

.lhs { 
  position: sticky; 
  top: 0; 
  height: 100vh; 
  padding: 2.5rem 1.5rem; 
  border-right: 1px solid color-mix(in oklch, var(--fg) 8%, transparent); 
  background: radial-gradient(1200px 700px at 20% 20%, var(--wash, transparent), transparent 60%);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  /* Ensure sticky works: avoid overflow on sticky parent */
  overflow: visible;
  min-height: 100vh;
  order: 1;
}

.resize-handle {
  position: absolute;
  right: -10px;
  top: 0;
  bottom: 0;
  width: 20px; /* bigger hitbox */
  cursor: col-resize;
  background: transparent;
  z-index: 10;
  transition: background-color .2s var(--ease);
  border-radius: 2px;
}

.resize-handle:hover {
  background: color-mix(in oklch, var(--accent) 30%, transparent);
}

.resize-handle:active {
  background: var(--accent);
}

.rhs { 
  /* Ensure content occupies available width and full viewport height */
  padding: 4rem clamp(1rem, 4vw, 4rem) 12rem clamp(0rem, 2vw, 2rem);
  width: 100%;
  max-width: none;
  min-height: 100vh;
  order: 2;
}

/* Brand Header */
.brand {
  margin-bottom: 3rem;
}

.brand h1 {
  font-size: clamp(2rem, 6vw, 2.75rem);
  font-weight: 600;
  margin: 0 0 0.5rem 0;
  letter-spacing: -0.025em;
}

.brand p {
  color: var(--muted);
  font-size: 1rem;
  margin: 0;
  line-height: 1.6;
}

/* Theme Toggle */
.theme-toggle-container {
  margin-bottom: 2rem;
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px; /* larger click target */
  height: 44px;
  border: 1px solid color-mix(in oklch, var(--fg) 15%, transparent);
  border-radius: 10px;
  background: var(--card);
  color: var(--fg);
  cursor: pointer;
  transition: all .2s var(--ease);
}

.theme-toggle:hover {
  background: color-mix(in oklch, var(--accent) 10%, transparent);
  border-color: var(--accent);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.theme-icon-light { display: block; }
.theme-icon-dark { display: none; }
[data-theme="ink"] .theme-icon-light { display: none; }
[data-theme="ink"] .theme-icon-dark { display: block; }

/* Navigation */
.nav {
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav li { margin-bottom: 0.5rem; }

.nav a {
  display: grid; 
  grid-template-columns: 1.25rem 1fr; 
  gap: .75rem; 
  align-items: center;
  color: color-mix(in oklch, var(--fg) 75%, var(--accent) 25%);
  text-decoration: none; 
  padding: .5rem .25rem; 
  border-radius: 10px;
  transition: color .2s var(--ease), background .2s var(--ease), filter .2s var(--ease);
  font-size: 1.1rem;
  font-weight: 500;
}

.nav a .dot { 
  width: 10px;
  height: 10px;
  border-radius: 999px; 
  background: color-mix(in oklch, var(--accent) 55%, white); 
  box-shadow: 0 0 0 0 transparent; 
  transition: all .2s var(--ease);
}

.nav a:hover { 
  background: color-mix(in oklch, var(--accent) 10%, transparent);
  color: var(--fg);
}

.nav a:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.nav a.is-active { color: var(--fg); }

.nav a.is-active .dot { 
  width: 10px; 
  height: 10px; 
  box-shadow: 0 0 0 6px color-mix(in oklch, var(--accent) 18%, transparent);
  background: linear-gradient(45deg, 
    color-mix(in oklch, var(--accent) 70%, white),
    color-mix(in oklch, var(--accent) 40%, white)
  );
}

/* Social Footer */
.social {
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid color-mix(in oklch, var(--fg) 8%, transparent);
}

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

.social-link {
  color: var(--muted);
  text-decoration: none;
  padding: 0.5rem;
  border-radius: 8px;
  transition: color .2s var(--ease), background .2s var(--ease);
}

.social-link:hover {
  color: var(--fg);
  background: color-mix(in oklch, var(--accent) 8%, transparent);
}

/* Content Sections */
section { 
  margin-bottom: 4rem;
  scroll-margin-top: 2rem;
}

.section-title {
  font-size: 2rem;
  font-weight: 600;
  margin: 0 0 2rem 0;
  letter-spacing: -0.03em;
  color: var(--fg);
}

.section-subtitle {
  font-size: 1.25rem;
  font-weight: 500;
  margin: 0 0 1rem 0;
  color: color-mix(in oklch, var(--fg) 85%, var(--accent) 15%);
}

.section-content {
  font-size: 1rem;
  line-height: 1.7;
  color: color-mix(in oklch, var(--fg) 90%, transparent);
}

/* Cards */
.card { 
  background: var(--card); 
  border: 1px solid color-mix(in oklch, var(--accent) 15%, transparent); 
  border-radius: var(--radius); 
  padding: 1.5rem; 
  backdrop-filter: saturate(110%) blur(4px);
  margin-bottom: 1.5rem;
  transition: all .2s var(--ease);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px color-mix(in oklch, var(--accent) 15%, transparent);
}

.card-header {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1rem;
}

.company-logo {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: color-mix(in oklch, var(--accent) 12%, white);
  border: 1px solid color-mix(in oklch, var(--accent) 20%, transparent);
}

.logo-placeholder {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--accent-ink);
}

.card-title-section { flex: 1; min-width: 0; }

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0 0 0.25rem 0;
  color: var(--fg);
}

.card-meta {
  font-size: 0.95rem;
  margin-bottom: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.education-badge {
  background: color-mix(in oklch, var(--pastel-lilac) 20%, white);
  color: color-mix(in oklch, var(--pastel-lilac) 40%, black);
  padding: 0.125rem 0.5rem;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 500;
  border: 1px solid color-mix(in oklch, var(--pastel-lilac) 25%, transparent);
}

.card-content {
  font-size: 0.95rem;
  line-height: 1.6;
  color: color-mix(in oklch, var(--fg) 85%, transparent);
}

.company-logo[data-company="freeagent"] {
  background: url("/assets/freeagent-09a3c38d.svg") no-repeat center / contain;
}

.company-logo[data-company="sumdog"] {
  background: url("/assets/sumdog-869ecc72.svg") no-repeat center / contain;
}

.company-logo[data-company="lumo"] {
  background: url("/assets/lumo-e3da9699.svg") no-repeat center / contain;
}

.company-logo[data-company="edinburgh"] {
  background: url("/assets/uoe-3ee91ec5.svg") no-repeat center / contain;
}

.company-logo[data-company="greggs"] {
  background: url("/assets/greggs-2958fd4c.svg") no-repeat center / contain;
}

.company-logo .logo-placeholder {
  display: none;
}

/* Tech Tags */
.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.tech-tag {
  background: color-mix(in oklch, var(--accent) 12%, transparent);
  color: var(--accent-ink);
  padding: 0.25rem 0.75rem;
  border-radius: 12px;
  font-size: 0.85rem;
  font-weight: 500;
  border: 1px solid color-mix(in oklch, var(--accent) 20%, transparent);
}

/* Links with Ghost Underlines */
a { 
  color: var(--fg); 
  text-decoration: none; 
  background: linear-gradient(to right, 
    color-mix(in oklch, var(--accent) 50%, white), 
    color-mix(in oklch, var(--accent) 30%, white)
  );
  background-size: 0 2px; 
  background-position: 50% 100%; 
  background-repeat: no-repeat; 
  transition: background-size .25s var(--ease);
}

a:hover { background-size: 100% 2px; }

a:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
  border-radius: 4px;
}

/* Project Links */
.project-links { display: flex; gap: 1rem; margin-top: 1rem; }

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: color-mix(in oklch, var(--accent) 8%, transparent);
  border: 1px solid color-mix(in oklch, var(--accent) 20%, transparent);
  border-radius: 8px;
  color: var(--accent-ink);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: all .2s var(--ease);
}

.project-link:hover { background: color-mix(in oklch, var(--accent) 15%, transparent); transform: translateY(-1px); }

/* Accordion for Project Items */
.accordion-panel { margin-top: 1rem; }

.accordion-toggle {
  width: 100%;
  background: none;
  border: none;
  padding: 0.75rem 0;
  text-align: left;
  font-size: 1rem;
  font-weight: 500;
  color: var(--fg);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border-top: 1px solid color-mix(in oklch, var(--fg) 12%, transparent);
  transition: color .2s var(--ease);
}

.accordion-toggle:hover { color: var(--accent-ink); }

.accordion-toggle:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 2px; border-radius: 4px; }

.accordion-icon { width: 1rem; height: 1rem; transition: transform .2s var(--ease); }

.accordion-panel[aria-expanded="true"] .accordion-icon { transform: rotate(90deg); }

.accordion-content { padding: 1rem 0 0 1.5rem; display: none; }

.accordion-panel[aria-expanded="true"] .accordion-content { display: block; }

.accordion-item { margin-bottom: 1rem; }

.accordion-item h4 { font-size: 0.95rem; font-weight: 600; margin: 0 0 0.25rem 0; color: var(--fg); }

.accordion-item p { font-size: 0.9rem; line-height: 1.55; margin: 0; color: color-mix(in oklch, var(--fg) 80%, transparent); }

/* Mobile Navigation Toggle Button */
.mobile-nav-toggle {
  display: none; /* Hidden on desktop */
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 1001;
  width: 48px;
  height: 48px;
  background: var(--card);
  border: 1px solid color-mix(in oklch, var(--accent) 20%, transparent);
  border-radius: 12px;
  color: var(--fg);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  transition: all .2s var(--ease);
  backdrop-filter: saturate(110%) blur(8px);
  box-shadow: 0 4px 12px color-mix(in oklch, var(--accent) 10%, transparent);
}

.mobile-nav-toggle:hover {
  background: color-mix(in oklch, var(--accent) 10%, transparent);
  border-color: var(--accent);
  transform: scale(1.05);
}

.mobile-nav-toggle:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

/* Toggle Icons */
.mobile-nav-toggle .hamburger-icon {
  display: block;
}

.mobile-nav-toggle .close-icon {
  display: none;
}

.mobile-nav-expanded .mobile-nav-toggle .hamburger-icon {
  display: none;
}

.mobile-nav-expanded .mobile-nav-toggle .close-icon {
  display: block;
}

/* Mobile Responsiveness */
@media (max-width: 960px) {
  .shell {
    grid-template-columns: 1fr;
    gap: 0;
    min-height: auto;
  }
  
  /* Show mobile toggle button */
  .mobile-nav-toggle {
    display: flex;
  }
  
  /* Desktop layout class for non-mobile states */
  .desktop-layout .mobile-nav-toggle {
    display: none;
  }
  
  .lhs { 
    position: fixed; /* Fixed positioning for mobile overlay */
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    padding: 5rem 1.5rem 1.5rem 1.5rem; /* Top padding for toggle button */
    border-right: 0;
    border-bottom: 0;
    min-height: 100vh;
    order: 1;
    background: var(--bg);
    z-index: 1000;
    overflow-y: auto;
    
    /* Initially hidden */
    transform: translateX(-100%);
    transition: transform .3s var(--ease);
  }
  
  /* Show sidebar when expanded */
  .mobile-nav-expanded .lhs {
    transform: translateX(0);
  }
  
  /* Add backdrop overlay when menu is open */
  .mobile-nav-expanded::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: color-mix(in oklch, var(--ink-10) 50%, transparent);
    z-index: 999;
    backdrop-filter: blur(2px);
  }
  
  .rhs { 
    padding: 5rem 1.25rem 1.25rem 1.25rem; /* Top padding for toggle button */
    min-height: 100vh;
    order: 2;
  }

  /* Navigation adjustments for mobile */
  .nav { 
    display: flex; 
    flex-direction: column; 
    gap: 0.75rem; 
    margin-bottom: 2rem;
  }
  
  .nav a { 
    justify-content: flex-start; 
    padding: 1rem 0.75rem;
    font-size: 1.1rem;
    border-radius: 12px;
    background: color-mix(in oklch, var(--accent) 6%, transparent);
    border: 1px solid color-mix(in oklch, var(--accent) 12%, transparent);
  }
  
  .nav a:hover {
    background: color-mix(in oklch, var(--accent) 12%, transparent);
  }
  
  .nav a.is-active {
    background: color-mix(in oklch, var(--accent) 15%, transparent);
    border-color: var(--accent);
  }
  
  /* Section adjustments */
  .section-title { font-size: 1.75rem; }
  
  /* Hide drag handle on mobile */
  .resize-handle { display: none; }
  
  /* Card adjustments */
  .card-header { 
    flex-direction: column; 
    align-items: flex-start; 
    gap: 0.75rem; 
  }
  
  .company-logo { align-self: flex-start; }
  .theme-toggle-container { margin-bottom: 1rem; }
  
  /* Brand header adjustments for mobile */
  .brand {
    margin-bottom: 2rem;
    text-align: center;
  }
  
  .brand h1 {
    font-size: 1.5rem;
  }
  
  /* Social links adjustments */
  .social-links {
    justify-content: center;
    margin-top: 1rem;
  }
}

/* Ensure content is not selectable when menu is transitioning */
.mobile-nav-expanded .rhs {
  pointer-events: none;
}

.mobile-nav-collapsed .rhs {
  pointer-events: auto;
}

/* Handle sidebar focus management */
.lhs[aria-hidden="true"] {
  visibility: hidden;
}

.lhs[aria-hidden="false"] {
  visibility: visible;
}

/* Prevent scrolling on body when mobile menu is open */
body.mobile-menu-open {
  overflow: hidden;
  height: 100vh;
}

/* Improve mobile navigation accessibility and visual feedback */
@media (max-width: 960px) {
  /* Focus ring adjustments for mobile */
  .nav a:focus-visible {
    outline: 3px solid var(--focus-ring);
    outline-offset: 3px;
  }
  
  /* Enhanced touch targets */
  .nav a {
    min-height: 48px; /* WCAG AA minimum touch target */
    display: flex;
    align-items: center;
  }
  
  /* Better visual feedback for active states */
  .nav a.is-active .dot {
    box-shadow: 0 0 0 8px color-mix(in oklch, var(--accent) 25%, transparent);
  }
}

/* Progressive Enhancement: Scroll-driven animations */
@supports (animation-timeline: scroll()) {
  .section-title {
    animation: slide-in both linear;
    animation-timeline: view();
    animation-range: entry 0% cover 40%;
  }
  
  @keyframes slide-in {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
  }
}

/* Reduced Motion Compliance */
@media (prefers-reduced-motion: reduce) {
  * { 
    animation-duration: 0.001ms !important; 
    animation-iteration-count: 1 !important; 
    transition-duration: 0.001ms !important; 
    scroll-behavior: auto !important; 
  }
  .card:hover { transform: none; }
  .project-link:hover { transform: none; }
}

/* Focus Management */
.skip-to-content {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--accent);
  color: var(--accent-ink);
  padding: 8px;
  border-radius: 4px;
  text-decoration: none;
  font-weight: 600;
  z-index: 1000;
  transition: top .2s var(--ease);
}

.skip-to-content:focus { top: 6px; }

/* View Transitions Support */
@supports (view-transition-name: none) {
  .card.is-transitioning { view-transition-name: card; }
  .nav a.is-active { view-transition-name: active-nav; }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --accent: oklch(0.5 0.15 220);
    --accent-ink: oklch(0.2 0.1 220);
  }
  .nav a, .card, .project-link { border-width: 2px; }
}