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

:root {
  --color-cyan-light: #7DD3FC;
  --color-sky-blue: #38BDF8;
  --color-blue: #3B82F6;
  --color-purple: #8B5CF6;
  --color-violet: #A78BFA;
  --color-magenta: #C084FC;
  --color-teal: #2DD4BF;
  --color-emerald: #10B981;

  --color-bg-deep: #0A0A0F;
  --color-bg: #111118;
  --color-surface: #1A1A24;
  --color-surface-light: #242432;

  --color-text-primary: #F8FAFC;
  --color-text-secondary: #94A3B8;
  --color-text-muted: #64748B;

  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;

  --border-radius: 8px;
  --border-color: rgba(148, 163, 184, 0.08);
  --transition-fast: 200ms ease;
  --transition-medium: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
}

/* Skip Link */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  z-index: 1000;
  padding: 12px 24px;
  background: var(--color-surface-light);
  color: var(--color-cyan-light);
  text-decoration: none;
  border: 2px solid var(--color-cyan-light);
  border-radius: var(--border-radius);
  font-weight: 500;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 16px;
}

/* Focus Styles */
:focus {
  outline: none;
}

:focus-visible {
  outline: 2px solid var(--color-cyan-light);
  outline-offset: 2px;
}

.card:focus-visible {
  outline-offset: 4px;
  border-color: rgba(125, 211, 252, 0.5);
}

.card--client:focus-visible {
  outline-color: var(--color-violet);
  border-color: rgba(167, 139, 250, 0.5);
}

body {
  font-family: var(--font-mono);
  background: var(--color-bg-deep);
  color: var(--color-text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  font-size: 14px;
}

/* Subtle grid overlay */
.grid-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(rgba(139, 92, 246, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(139, 92, 246, 0.02) 1px, transparent 1px);
  background-size: 50px 50px;
}

/* Orbital Background Pattern */
.orbital-bg {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}

.orbital-ring {
  position: absolute;
  border: 1px solid rgba(139, 92, 246, 0.03);
  border-radius: 50%;
  animation: orbit-drift 60s linear infinite;
}

.orbital-ring:nth-child(1) {
  width: 800px;
  height: 400px;
  top: -100px;
  right: -200px;
  transform: rotate(-15deg);
  border-color: rgba(125, 211, 252, 0.04);
}

.orbital-ring:nth-child(2) {
  width: 600px;
  height: 300px;
  bottom: 10%;
  left: -150px;
  transform: rotate(25deg);
  animation-duration: 80s;
  animation-direction: reverse;
}

.orbital-ring:nth-child(3) {
  width: 1000px;
  height: 500px;
  top: 40%;
  right: -300px;
  transform: rotate(-30deg);
  border-color: rgba(56, 189, 248, 0.025);
  animation-duration: 100s;
}

@keyframes orbit-drift {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Gradient Glow */
.gradient-glow {
  position: fixed;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.15;
  pointer-events: none;
  z-index: 0;
}

.gradient-glow--top {
  top: -200px;
  right: -100px;
  background: radial-gradient(circle, var(--color-cyan-light) 0%, transparent 70%);
  animation: glow-pulse 15s ease-in-out infinite;
}

.gradient-glow--bottom {
  bottom: -200px;
  left: -100px;
  background: radial-gradient(circle, var(--color-purple) 0%, transparent 70%);
  animation: glow-pulse 20s ease-in-out infinite reverse;
}

@keyframes glow-pulse {
  0%, 100% { opacity: 0.12; transform: scale(1); }
  50% { opacity: 0.18; transform: scale(1.1); }
}

/* Layout */
.container {
  position: relative;
  z-index: 1;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 32px;
}

/* Header */
header {
  padding: 32px 0;
}

.logo-container {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo {
  width: 44px;
  height: 44px;
  transition: transform var(--transition-medium);
}

.logo:hover {
  transform: rotate(15deg) scale(1.05);
}

.logo-text-wrapper {
  display: flex;
  align-items: center;
  gap: 0;
}

.logo-bracket {
  font-size: 1.5rem;
  font-weight: 300;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-cyan-light);
  letter-spacing: -0.02em;
}

.logo-dot {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

.logo-ai {
  font-size: 1.25rem;
  font-weight: 600;
  background: linear-gradient(135deg, var(--color-cyan-light) 0%, var(--color-violet) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-container:hover .logo-bracket:first-of-type {
  color: var(--color-cyan-light);
}

.logo-container:hover .logo-bracket:last-of-type {
  color: var(--color-violet);
}

/* Hero */
.hero {
  padding: 64px 0 80px;
}

.hero h1 {
  font-size: clamp(1.75rem, 4.5vw, 2.75rem);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.hero h1 .line-static {
  display: block;
  color: var(--color-text-primary);
}

.hero h1 .line-gradient {
  display: inline;
  background: linear-gradient(90deg, var(--color-cyan-light) 0%, var(--color-violet) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-intro {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  line-height: 1.7;
  font-weight: 400;
}

.hero-intro a {
  color: var(--color-sky-blue);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.hero-intro a:hover {
  color: var(--color-cyan-light);
}

.footnote-ref {
  font-size: 0.75em;
  color: var(--color-text-muted);
  text-decoration: none;
  vertical-align: super;
  margin-left: 1px;
  transition: color var(--transition-fast);
}

.footnote-ref:hover {
  color: var(--color-text-secondary);
}

/* Sections */
section {
  padding: 48px 0;
}

.section-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}

.section-header h2 {
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.section-line {
  flex: 1;
  height: 1px;
  background: var(--border-color);
}

/* Section Content */
.expandable-inner {
  overflow: visible;
}

/* Card Grids */
.projects-grid,
.clients-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

/* ===========================================
   Unified Card Component
   Uses CSS custom properties for variants
   =========================================== */

.card {
  --card-accent: var(--color-cyan-light);
  --card-accent-rgb: 125, 211, 252;
  --card-gradient-start: var(--color-sky-blue);
  --card-gradient-end: var(--color-cyan-light);
  --card-prefix: './';

  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 20px 24px;
  transition: all var(--transition-fast);
  cursor: pointer;
  text-decoration: none;
  display: flex;
  flex-direction: column;
}

/* Client card variant */
.card--client {
  --card-accent: var(--color-violet);
  --card-accent-rgb: 167, 139, 250;
  --card-gradient-start: var(--color-purple);
  --card-gradient-end: var(--color-violet);
  --card-prefix: '>';
}

.card:hover {
  z-index: 10;
  border-color: rgba(var(--card-accent-rgb), 0.3);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.card-name {
  font-size: 1rem;
  font-weight: 500;
  color: var(--card-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
  margin-bottom: 0;
}

.card-name::before {
  content: var(--card-prefix);
  color: var(--color-text-muted);
  font-weight: 400;
}

.card--client .card-name {
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

.card:hover .card-name {
  color: var(--color-text-primary);
}

.card-arrow {
  color: var(--color-text-muted);
  opacity: 0;
  transform: translateX(-8px);
  transition: all var(--transition-fast);
  flex-shrink: 0;
  text-decoration: none;
  display: flex;
  align-items: center;
  justify-content: center;
}

.card-arrow:hover {
  color: var(--card-accent);
}

.card:hover .card-arrow {
  opacity: 1;
  transform: translateX(0);
}

.card-summary {
  margin-top: 8px;
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  font-weight: 400;
}

/* Popup overlay for cards */
.card-popup {
  position: absolute;
  top: 12px;
  left: 12px;
  right: -12px;
  background: var(--color-surface-light);
  border: 2px solid transparent;
  border-radius: var(--border-radius);
  padding: 20px 24px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: all var(--transition-medium);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
  z-index: 20;
  background-image: linear-gradient(var(--color-surface-light), var(--color-surface-light)),
                    linear-gradient(135deg, var(--card-gradient-start) 0%, var(--card-gradient-end) 100%);
  background-origin: border-box;
  background-clip: padding-box, border-box;
}

.card:hover .card-popup {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.card-popup .card-header {
  margin-bottom: 12px;
}

.card-popup .card-name {
  color: var(--color-text-primary);
}

.card-popup .card-arrow {
  opacity: 1;
  transform: translateX(0);
  padding: 6px;
  background: rgba(var(--card-accent-rgb), 0.15);
  border: 1px solid rgba(var(--card-accent-rgb), 0.4);
  border-radius: 6px;
  color: var(--card-accent);
  transition: all var(--transition-fast);
}

.card-popup .card-arrow:hover {
  background: rgba(var(--card-accent-rgb), 0.25);
  border-color: var(--card-accent);
  color: var(--color-text-primary);
}

.card-description,
.card-description-mobile {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  font-weight: 400;
}

.card-description-mobile a {
  color: var(--color-sky-blue);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.card-description-mobile a:hover {
  color: var(--color-cyan-light);
}

.card-description a {
  color: var(--color-sky-blue);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.card-description a:hover {
  color: var(--color-cyan-light);
}

/* Footer */
footer {
  padding: 64px 0 48px;
  margin-top: 48px;
  border-top: 1px solid var(--border-color);
}

.footer-content {
  display: grid;
  grid-template-columns: auto auto auto auto;
  justify-content: start;
  gap: 48px;
}

.footer-col h3 {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.footer-col h3::before {
  content: '// ';
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-link {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--color-text-primary);
}

.footer-link svg {
  width: 18px;
  height: 18px;
  opacity: 0.7;
}

.reference-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.reference-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

.reference-link:hover {
  color: var(--color-text-primary);
}

.reference-link.highlight {
  color: var(--color-text-primary);
  background-color: rgba(125, 211, 252, 0.15);
}

.reference-number {
  color: var(--color-text-muted);
  margin-right: 6px;
}

.footer-bottom {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  text-align: left;
}

.copyright {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* ===========================================
   Mobile & Touch Device Styles
   Consolidated into a single block using :is()
   =========================================== */

/* Desktop with pointer: hide mobile descriptions */
@media (min-width: 769px) and (hover: hover) {
  .card-description-mobile {
    display: none !important;
  }
}

/* Mobile and touch devices share the same behavior */
@media (max-width: 768px), (pointer: coarse) and (min-width: 769px) {
  .projects-grid,
  .clients-grid {
    grid-template-columns: 1fr;
  }

  /* Hide popup, use inline expand instead */
  .card-popup {
    display: none !important;
  }

  .card {
    cursor: pointer;
  }

  .card-description-mobile {
    display: block !important;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: all var(--transition-medium);
    margin-top: 0;
  }

  .card.expanded .card-description-mobile {
    max-height: 500px;
    opacity: 1;
    margin-top: 12px;
  }

  .card.expanded .card-summary {
    display: none;
  }

  /* Disable hover effects on mobile */
  .card:hover .card-name,
  .card .card-name {
    color: var(--card-accent) !important;
  }

  .card:hover .card-arrow,
  .card .card-arrow {
    opacity: 0 !important;
    pointer-events: none;
    transform: translateX(-8px);
  }

  .card:hover {
    border-color: var(--border-color) !important;
  }

  /* Expanded state */
  .card.expanded .card-arrow {
    opacity: 1 !important;
    transform: translateX(0);
    pointer-events: auto;
    padding: 6px;
    background: rgba(var(--card-accent-rgb), 0.15);
    border: 1px solid rgba(var(--card-accent-rgb), 0.4);
    border-radius: 6px;
    color: var(--card-accent);
  }

  .card.expanded .card-name {
    color: var(--color-text-primary) !important;
  }

  .card.expanded,
  .card.expanded:hover {
    border-color: rgba(var(--card-accent-rgb), 0.4) !important;
  }
}

@media (max-width: 950px) {
  .footer-content {
    grid-template-columns: repeat(2, auto);
    gap: 32px 48px;
  }
}

@media (max-width: 640px) {
  .hero {
    padding: 48px 0 64px;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .card {
    padding: 16px 20px;
  }
}

/* Subtle entrance animations */
@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-in {
  animation: fade-up 0.6s ease-out forwards;
}

.delay-1 { animation-delay: 0.1s; opacity: 0; }
.delay-2 { animation-delay: 0.2s; opacity: 0; }
.delay-3 { animation-delay: 0.3s; opacity: 0; }
.delay-4 { animation-delay: 0.4s; opacity: 0; }

/* Cursor blink for terminal feel */
@keyframes blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

.cursor-blink {
  animation: blink 1s step-end infinite;
  color: var(--color-violet);
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .gradient-glow,
  .orbital-ring {
    animation: none;
  }
}