/* Cascade Layer Ordering */
@layer reset, base, theme, layout, components, utilities;

@layer reset {
  /* Box sizing rules */
  *,
  *::before,
  *::after {
    box-sizing: border-box;
  }

  /* Prevent font size inflation and set smooth scrolling */
  html {
    -moz-text-size-adjust: none;
    -webkit-text-size-adjust: none;
    text-size-adjust: none;
    scroll-behavior: smooth;
  }

  /* Remove default margin and padding */
  body,
  h1,
  h2,
  h3,
  h4,
  p,
  ul,
  li,
  figure,
  blockquote,
  dl,
  dd {
    margin: 0;
    padding: 0;
  }

  ul {
    list-style: none;
  }

  /* Set core body defaults */
  body {
    min-height: 100vh;
    line-height: 1.6;
    overflow-x: hidden;
  }

  /* Make images and media easier to work with */
  img,
  picture,
  canvas {
    max-width: 100%;
    display: block;
  }

  /* Inherit fonts for inputs and buttons */
  input,
  button,
  textarea,
  select {
    font: inherit;
  }

  /* Remove all animations, transitions and smooth scroll for people who prefer not to see them */
  @media (prefers-reduced-motion: reduce) {
    html:focus-within {
      scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
      animation-duration: 0.01ms !important;
      animation-iteration-count: 1 !important;
      transition-duration: 0.01ms !important;
      scroll-behavior: auto !important;
    }
  }
}

@layer base {
  :root {
    color-scheme: dark;
    
    /* Literal and Semantic Design Tokens */
    --bg-primary: #07090e;
    --bg-secondary: #0c0f17;
    --bg-surface: rgba(15, 22, 36, 0.7);
    --bg-surface-hover: rgba(22, 32, 51, 0.9);
    
    --color-accent: #10b981; /* Emerald */
    --color-accent-rgb: 16, 185, 129;
    --color-secondary: #06b6d4; /* Cyan */
    --color-secondary-rgb: 6, 182, 212;
    --color-danger: #ef4444;
    --color-danger-rgb: 239, 68, 68;
    --color-success: #10b981;
    
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --border-color: rgba(30, 41, 59, 0.6);
    --border-glow: rgba(6, 182, 212, 0.2);
    
    /* Typography Tokens */
    --font-sans: 'Outfit', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    /* Spacing & Utilities */
    --transition-smooth: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    --transition-fast: 0.15s ease;
    --border-radius-sm: 8px;
    --border-radius-md: 16px;
    --border-radius-lg: 24px;
    
    --shadow-sm: 0 2px 8px -2px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 10px 25px -10px rgba(0, 0, 0, 0.7);
    --shadow-lg: 0 20px 40px -15px rgba(0, 0, 0, 0.8);
    --shadow-glow: 0 0 20px rgba(6, 182, 212, 0.15);
  }

  body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1rem;
    -webkit-font-smoothing: antialiased;
    text-wrap: pretty;
  }

  body::before {
    content: '';
    position: fixed;
    inset: 0;
    z-index: -1;
    background-image:
      linear-gradient(rgba(6, 182, 212, 0.03) 1px, transparent 1px),
      linear-gradient(90deg, rgba(6, 182, 212, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
  }

  body::after {
    content: '';
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: repeating-linear-gradient(
      0deg,
      transparent,
      transparent 2px,
      rgba(0, 0, 0, 0.015) 2px,
      rgba(0, 0, 0, 0.015) 4px
    );
    pointer-events: none;
  }

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

  h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
  }

  /* Scrollbars styling */
  scrollbar-color: rgba(6, 182, 212, 0.3) var(--bg-secondary);
  scrollbar-width: thin;

  ::selection {
    background-color: rgba(6, 182, 212, 0.3);
    color: var(--text-primary);
  }

  /* Accessibility focus ring */
  *:focus-visible {
    outline: 2px solid var(--color-secondary);
    outline-offset: 4px;
  }
}

@layer theme {
  /* Dynamic Background Canvas */
  #particle-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    pointer-events: none;
  }
}

@layer layout {
  .nav-container,
  .hero-content-wrapper,
  .section-container,
  .footer-container {
    width: 100%;
    max-width: 1200px;
    margin-inline: auto;
    padding-inline: 1.5rem;
  }

  section {
    padding-block: clamp(4rem, 8vw, 8rem);
    position: relative;
  }
}

@layer components {
  /* Navigation Header */
  .main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    background-color: rgba(7, 9, 14, 0.7);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    transition: background-color var(--transition-smooth), padding-block var(--transition-smooth);
    padding-block: 1.25rem;
  }

  .main-header.scrolled {
    padding-block: 0.75rem;
    background-color: rgba(7, 9, 14, 0.9);
  }

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

  .logo-link {
    font-size: 1.75rem;
    font-weight: 800;
    letter-spacing: -0.5px;
  }

  .logo-link .text-accent {
    color: var(--color-secondary);
  }

  .nav-list {
    display: flex;
    gap: 2rem;
  }

  .nav-link {
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-secondary);
    position: relative;
    padding-block: 0.25rem;
  }

  .nav-link:hover,
  .nav-link.active {
    color: var(--text-primary);
  }

  .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(to right, var(--color-accent), var(--color-secondary));
    transform: scaleX(0);
    transform-origin: right;
    transition: transform var(--transition-smooth);
  }

  .nav-link:hover::after,
  .nav-link.active::after {
    transform: scaleX(1);
    transform-origin: left;
  }

  .menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
  }

  .menu-toggle .bar {
    width: 100%;
    height: 2px;
    background-color: var(--text-primary);
    transition: transform var(--transition-smooth), opacity var(--transition-smooth);
  }

  /* Buttons */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.8rem 1.8rem;
    font-weight: 600;
    font-size: 0.95rem;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-smooth);
    cursor: pointer;
    min-block-size: 44px; /* Touch target size */
  }

  .btn-primary {
    background: linear-gradient(135deg, var(--color-accent), var(--color-secondary));
    color: var(--bg-primary);
    border: none;
    box-shadow: 0 4px 15px rgba(6, 182, 212, 0.25);
  }

  .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(6, 182, 212, 0.4);
    filter: brightness(1.1);
  }

  .btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
  }

  .btn-outline:hover {
    background-color: rgba(255, 255, 255, 0.05);
    border-color: var(--text-secondary);
    transform: translateY(-2px);
  }

  /* Badges - Terminal Status Style */
  .badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 1rem;
    background-color: rgba(6, 182, 212, 0.08);
    border: 1px solid rgba(6, 182, 212, 0.25);
    color: var(--color-secondary);
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: 600;
    font-family: var(--font-mono);
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-glow);
    letter-spacing: 0.5px;
    position: relative;
  }

  .badge::before {
    content: '>';
    color: var(--color-accent);
    font-weight: 700;
  }

  /* Section Titles */
  .section-title {
    font-size: clamp(2rem, 4vw, 2.75rem);
    margin-bottom: 3rem;
    display: flex;
    align-items: center;
    gap: 1rem;
  }

  .section-title .text-accent {
    font-family: var(--font-mono);
    font-weight: 500;
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  }

  .section-title::after {
    content: '';
    flex: 1;
    height: 1px;
    background: linear-gradient(to right, var(--color-accent), transparent);
    max-width: 300px;
  }

  .section-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 700px;
    margin-bottom: 3.5rem;
  }

  /* Hero Section */
  .hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 6rem;
  }

  .hero-content-wrapper {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 4rem;
    align-items: center;
  }

  .hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    line-height: 1.1;
    margin-bottom: 1.5rem;
    letter-spacing: -1px;
  }

  .title-greet {
    display: block;
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
  }

  .title-name {
    display: block;
    background: linear-gradient(120deg, var(--text-primary) 30%, var(--color-secondary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  .hero-tagline {
    font-size: clamp(1.3rem, 3vw, 1.85rem);
    font-weight: 700;
    margin-top: 0.5rem;
    margin-bottom: 1.25rem;
    letter-spacing: -0.01em;
    line-height: 1.3;
    background: linear-gradient(135deg, var(--color-accent), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid rgba(6, 182, 212, 0.15);
    width: fit-content;
  }

  .hero-description {
    font-size: clamp(1rem, 1.8vw, 1.15rem);
    line-height: 1.65;
    color: var(--text-secondary);
    max-width: 650px;
    margin-bottom: 2.5rem;
  }

  .hero-description strong {
    color: var(--text-primary);
  }

  /* Hero Metrics Strip */
  .hero-metrics {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    margin-bottom: 2rem;
    padding: 1.25rem;
    background: rgba(15, 22, 36, 0.5);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    backdrop-filter: blur(8px);
  }

  .metric-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    position: relative;
  }

  .metric-item:not(:last-child)::after {
    content: '';
    position: absolute;
    right: -0.5rem;
    top: 15%;
    height: 70%;
    width: 1px;
    background: linear-gradient(to bottom, transparent, var(--border-color), transparent);
  }

  .metric-value {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-accent), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.2;
  }

  .metric-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 500;
    text-align: center;
  }

  .hero-actions {
    display: flex;
    gap: 1.25rem;
  }

  .hero-visual-content {
    display: flex;
    justify-content: center;
    position: relative;
  }

  .avatar-frame {
    width: min(100%, 350px);
    aspect-ratio: 1;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    position: relative;
    border: 1px solid rgba(6, 182, 212, 0.3);
    box-shadow: var(--shadow-lg), 0 0 40px rgba(6, 182, 212, 0.1), 0 0 80px rgba(16, 185, 129, 0.05);
    animation: avatarGlow 4s ease-in-out infinite alternate;
  }

  @keyframes avatarGlow {
    from {
      box-shadow: var(--shadow-lg), 0 0 30px rgba(6, 182, 212, 0.1), 0 0 60px rgba(16, 185, 129, 0.03);
    }
    to {
      box-shadow: var(--shadow-lg), 0 0 50px rgba(6, 182, 212, 0.2), 0 0 100px rgba(16, 185, 129, 0.08);
    }
  }

  .avatar-frame::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.2), rgba(6, 182, 212, 0.2));
    mix-blend-mode: overlay;
    z-index: 1;
    transition: opacity var(--transition-smooth);
  }

  .avatar-frame:hover::before {
    opacity: 0.3;
  }

  .avatar-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top;
    transition: transform var(--transition-smooth);
  }

  .avatar-frame:hover .avatar-img {
    transform: scale(1.05);
  }

  .scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
  }

  .scroll-arrow {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--text-muted);
    font-size: 1rem;
    transition: color var(--transition-fast), transform var(--transition-fast);
  }

  .scroll-arrow:hover {
    color: var(--color-secondary);
    transform: translateY(4px);
  }

  .arrow-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--color-secondary);
    margin-bottom: 0.5rem;
    animation: bounce 2s infinite ease-in-out;
  }

  /* About Section */
  .about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5rem;
    align-items: start;
  }

  .lead-text {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    font-weight: 500;
  }

  .about-bio p {
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
  }

  /* Timeline */
  .experience-timeline {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 2.5rem;
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(12px);
  }

  .timeline-title {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
  }

  .timeline-title::after {
    content: '';
    flex: 1;
    height: 1px;
    background-color: var(--border-color);
  }

  .timeline-wrapper {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    position: relative;
    padding-left: 1.5rem;
  }

  .timeline-wrapper::before {
    content: '';
    position: absolute;
    left: 0;
    top: 5px;
    bottom: 5px;
    width: 2px;
    background: linear-gradient(to bottom, var(--color-accent), var(--color-secondary));
  }

  .timeline-item {
    position: relative;
  }

  .timeline-marker {
    position: absolute;
    left: -1.85rem;
    top: 6px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--bg-primary);
    border: 2.5px solid var(--color-secondary);
    box-shadow: var(--shadow-glow);
    transition: background-color var(--transition-fast);
  }

  .timeline-item:hover .timeline-marker {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
  }

  .timeline-date {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-secondary);
    margin-bottom: 0.4rem;
    font-weight: 600;
  }

  .timeline-role {
    font-size: 1.2rem;
    margin-bottom: 0.25rem;
  }

  .timeline-org {
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 0.75rem;
  }

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

  .timeline-bullets {
    padding-left: 1.25rem;
    list-style-type: disc;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
  }

  .timeline-bullets li {
    font-size: 0.9rem;
    color: var(--text-secondary);
  }

  /* Interactive Pipeline Visualizer Section */


  .projects-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 4rem;
  }

  .project-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    overflow: visible;
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(12px);
    transition: border-color var(--transition-smooth), box-shadow var(--transition-smooth), transform 0.6s cubic-bezier(0.2, 0.8, 0.2, 1);
    transform-style: preserve-3d;
    perspective: 1000px;
  }

  .project-card:hover {
    border-color: var(--border-glow);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    transition: border-color var(--transition-smooth), box-shadow var(--transition-smooth), transform 0s;
  }

  .project-card.featured {
    grid-template-columns: 1fr 1.2fr;
    border-color: rgba(6, 182, 212, 0.2);
    box-shadow: 0 10px 30px -10px rgba(6, 182, 212, 0.1);
  }

  .project-card.featured:hover {
    border-color: var(--color-secondary);
    box-shadow: var(--shadow-lg), 0 0 30px rgba(6, 182, 212, 0.25);
    transition: border-color var(--transition-smooth), box-shadow var(--transition-smooth), transform 0s;
  }

  .project-image-wrapper {
    position: relative;
    overflow: hidden;
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    border-top-left-radius: var(--border-radius-md);
    border-bottom-left-radius: var(--border-radius-md);
    transform-style: preserve-3d;
  }

  .project-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s cubic-bezier(0.2, 0.8, 0.2, 1);
  }

  .project-card:hover .project-img {
    transform: translateZ(45px) scale(1.05);
  }

  .project-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to right, rgba(7, 9, 14, 0.8), rgba(7, 9, 14, 0));
    mix-blend-mode: multiply;
  }

  .project-details {
    padding: 3rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transform-style: preserve-3d;
    transition: transform 0.6s cubic-bezier(0.2, 0.8, 0.2, 1);
  }

  /* 3D Depth-Pop transition and hover transformations */
  .project-category,
  .project-title,
  .project-tagline,
  .project-bullets,
  .project-tech-tags,
  .project-links,
  .project-description-tabs {
    transition: transform 0.6s cubic-bezier(0.2, 0.8, 0.2, 1);
    transform-style: preserve-3d;
  }

  .project-card:hover .project-category {
    transform: translateZ(40px);
  }

  .project-card:hover .project-title {
    transform: translateZ(60px);
  }

  .project-card:hover .project-tagline {
    transform: translateZ(50px);
  }

  .project-card:hover .project-bullets {
    transform: translateZ(45px);
  }

  .project-card:hover .project-tech-tags {
    transform: translateZ(55px);
  }

  .project-card:hover .project-links {
    transform: translateZ(70px);
  }

  .project-card:hover .project-description-tabs {
    transform: translateZ(30px);
  }

  .project-category {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--color-secondary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.5rem;
    display: inline-block;
  }

  .project-title {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
  }

  .project-tagline {
    font-size: 1.05rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
  }

  .project-bullets {
    list-style-type: square;
    padding-left: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 2rem;
  }

  .project-bullets li {
    font-size: 0.95rem;
    color: var(--text-secondary);
  }

  .project-bullets code {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    background-color: rgba(255, 255, 255, 0.05);
    padding: 0.1rem 0.3rem;
    border-radius: 4px;
    color: var(--text-primary);
  }

  .project-tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin-bottom: 2rem;
  }

  .project-tech-tags span {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-secondary);
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    padding: 0.3rem 0.8rem;
    border-radius: 9999px;
  }

  .project-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
  }

  .project-link {
    font-weight: 600;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--text-secondary);
  }

  .project-link:hover {
    color: var(--color-secondary);
  }

  .project-link-disabled {
    font-weight: 600;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--text-muted);
    cursor: not-allowed;
  }

  /* Description Tabs (Trisoul AI specific) */
  .project-description-tabs {
    margin-bottom: 2rem;
  }

  .tabs-nav {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 1.25rem;
  }

  .tab-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    padding: 0.5rem 1rem;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9rem;
    position: relative;
    transition: color var(--transition-fast);
    min-block-size: 40px;
  }

  .tab-btn:hover {
    color: var(--text-secondary);
  }

  .tab-btn.active {
    color: var(--color-secondary);
  }

  .tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--color-secondary);
  }

  .tab-pane {
    display: none;
  }

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

  .tab-pane ul {
    list-style-type: square;
    padding-left: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
  }

  .tab-pane li {
    font-size: 0.95rem;
    color: var(--text-secondary);
  }

  .tab-pane strong {
    color: var(--text-primary);
  }

  /* Skills Section */
  .skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2.5rem;
  }

  .skill-category-card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(12px);
  }

  .skill-category-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.75rem;
  }

  .skill-category-card h3 i {
    color: var(--color-secondary);
  }

  .skill-tags {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
  }

  .skill-tag-item {
    font-family: var(--font-sans);
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
    background-color: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    padding: 0.55rem 0.9rem;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: all var(--transition-fast);
  }

  .skill-tag-item i {
    color: var(--color-secondary);
    font-size: 0.95rem;
    transition: transform var(--transition-fast);
    width: 20px; /* fixed width to align text nicely */
    text-align: center;
  }

  .skill-tag-item:hover {
    background-color: rgba(6, 182, 212, 0.08);
    border-color: rgba(6, 182, 212, 0.4);
    transform: translateX(4px); /* slide right slightly instead of up for list layout */
    box-shadow: 2px 4px 12px rgba(6, 182, 212, 0.1);
  }

  .skill-tag-item:hover i {
    transform: scale(1.15);
  }

  /* Contact Section */
  .contact-wrapper {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 4rem;
    align-items: start;
  }

  .contact-title {
    font-size: 1.5rem;
    margin-bottom: 1rem;
  }

  .contact-details p {
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
  }

  .contact-links-list {
    display: flex;
    flex-direction: column;
    gap: 1.75rem;
  }

  .contact-links-list li {
    display: flex;
    align-items: center;
    gap: 1.25rem;
  }

  .icon-wrap {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: var(--color-secondary);
    box-shadow: var(--shadow-sm);
    aspect-ratio: 1;
  }

  .link-info {
    display: flex;
    flex-direction: column;
  }

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

  .link-value {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
  }

  .link-value:hover {
    color: var(--color-secondary);
  }

  .contact-form-container {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 3rem;
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(12px);
  }

  .contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
  }

  .form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  }

  .form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    position: relative;
  }

  .form-group label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
  }

  .form-group input,
  .form-group textarea {
    width: 100%;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.8rem 1rem;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
  }

  .form-group input:focus,
  .form-group textarea:focus {
    outline: none;
    border-color: var(--color-secondary);
    box-shadow: 0 0 10px rgba(6, 182, 212, 0.15);
  }

  .error-msg {
    display: none;
    font-size: 0.8rem;
    color: var(--color-danger);
    margin-top: 0.25rem;
  }

  /* HTML5 validation overrides */
  .form-group input:user-invalid,
  .form-group textarea:user-invalid {
    border-color: var(--color-danger);
    box-shadow: 0 0 10px rgba(239, 68, 68, 0.1);
  }

  .form-group input:user-invalid + .error-msg,
  .form-group textarea:user-invalid + .error-msg {
    display: block;
  }

  .btn-submit {
    align-self: flex-start;
    border: none;
  }

  .form-status-msg {
    display: none;
    padding: 1rem;
    border-radius: var(--border-radius-sm);
    font-size: 0.95rem;
    align-items: center;
    gap: 0.75rem;
  }

  .form-status-msg.success {
    background-color: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
    color: var(--color-success);
  }

  /* Footer */
  .main-footer {
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
    padding-block: 3rem;
  }

  .footer-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    text-align: center;
  }

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

  .footer-socials {
    display: flex;
    gap: 1.5rem;
    font-size: 1.25rem;
  }

  .footer-socials a {
    color: var(--text-muted);
  }

  .footer-socials a:hover {
    color: var(--color-secondary);
  }

  .footer-note {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
  }

  /* === AI Engineer Aesthetic Elements === */

  /* Blinking cursor on hero tagline */
  .cursor-blink {
    -webkit-text-fill-color: var(--color-accent);
    animation: cursorBlink 1s step-end infinite;
    font-weight: 400;
    margin-left: 2px;
  }

  @keyframes cursorBlink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
  }

  /* Pulsing status dot in badge */
  .status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--color-accent);
    display: inline-block;
    position: relative;
    flex-shrink: 0;
  }

  .status-dot::after {
    content: '';
    position: absolute;
    inset: -3px;
    border-radius: 50%;
    border: 1px solid var(--color-accent);
    animation: statusPulse 2s ease-in-out infinite;
  }

  @keyframes statusPulse {
    0%, 100% { opacity: 0.6; transform: scale(1); }
    50% { opacity: 0; transform: scale(1.6); }
  }

  /* Terminal prompt text */
  .terminal-prompt {
    font-family: var(--font-mono);
    font-size: 0.85em;
    color: var(--color-accent);
    margin-right: 0.5rem;
    opacity: 0.7;
    letter-spacing: 0;
    font-weight: 600;
  }

  /* Skill card circuit corner decoration */
  .skill-category-card {
    position: relative;
  }

  .skill-category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 40px;
    height: 40px;
    border-top: 2px solid var(--color-accent);
    border-left: 2px solid var(--color-accent);
    border-top-left-radius: var(--border-radius-md);
    opacity: 0.3;
    transition: opacity var(--transition-smooth);
    pointer-events: none;
  }

  .skill-category-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    right: 0;
    width: 40px;
    height: 40px;
    border-bottom: 2px solid var(--color-secondary);
    border-right: 2px solid var(--color-secondary);
    border-bottom-right-radius: var(--border-radius-md);
    opacity: 0.3;
    transition: opacity var(--transition-smooth);
    pointer-events: none;
  }

  .skill-category-card:hover::before,
  .skill-category-card:hover::after {
    opacity: 0.8;
  }

  .skill-category-card:hover {
    border-color: rgba(6, 182, 212, 0.25);
    box-shadow: var(--shadow-md), 0 0 30px rgba(6, 182, 212, 0.06);
  }

  /* Project card glowing top-border accent */
  .project-card::before {
    content: '';
    position: absolute;
    top: -1px;
    left: 10%;
    right: 10%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--color-accent), var(--color-secondary), transparent);
    border-radius: 2px;
    opacity: 0;
    transition: opacity var(--transition-smooth);
    z-index: 1;
  }

  .project-card {
    position: relative;
  }

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

  /* Timeline marker glow effect */
  .timeline-marker {
    box-shadow: 0 0 8px rgba(6, 182, 212, 0.3);
  }

  /* Contact icon circuit style */
  .icon-wrap {
    position: relative;
  }

  .icon-wrap::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 50%;
    transform: translateX(-50%);
    width: 1px;
    height: 8px;
    background-color: rgba(6, 182, 212, 0.3);
  }

  /* Hero section data metrics overlay */
  .hero-visual-content::before {
    content: 'STATUS: ACTIVE';
    position: absolute;
    top: -1.5rem;
    right: 0;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--color-accent);
    letter-spacing: 2px;
    opacity: 0.5;
  }

  .hero-visual-content::after {
    content: 'v2.0 • 2026';
    position: absolute;
    bottom: -1.5rem;
    right: 0;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--text-muted);
    letter-spacing: 1.5px;
    opacity: 0.5;
  }
}

@layer utilities {
  .text-accent {
    color: var(--color-accent);
  }
  
  .text-secondary {
    color: var(--color-secondary);
  }

  /* Hide element visually while keeping it screen reader accessible */
  .sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
  }
}

/* Animations */
@keyframes bounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-6px);
  }
}

@keyframes flow {
  to {
    transform: translateX(100%);
  }
}

/* Native Scroll-Driven Animations */
@media (prefers-reduced-motion: no-preference) {
  @supports ((animation-timeline: view()) and (animation-range: entry)) {
    @keyframes fadeInUp {
      from {
        opacity: 0;
        transform: translateY(40px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    @keyframes fadeInUp3D {
      from {
        opacity: 0;
        transform: translateY(60px) rotateX(-12deg) scale(0.95);
      }
      to {
        opacity: 1;
        transform: translateY(0) rotateX(0deg) scale(1);
      }
    }
    
    @keyframes fadeOutUp {
      from {
        opacity: 1;
        transform: translateY(0);
      }
      to {
        opacity: 0;
        transform: translateY(-40px);
      }
    }

    /* Apply scroll animations to section elements */
    .section-container > * {
      animation: fadeInUp auto linear both;
      animation-timeline: view();
      animation-range: entry 10% cover 30%;
    }

    .project-card {
      animation: fadeInUp3D auto linear both;
      animation-timeline: view();
      animation-range: entry 5% cover 25%;
    }

    .skill-category-card {
      animation: fadeInUp3D auto linear both;
      animation-timeline: view();
      animation-range: entry 10% cover 25%;
    }
  }
}

/* Responsive Breakpoints */
@media (max-width: 1024px) {
  .hero-content-wrapper {
    gap: 2rem;
  }

  .about-grid {
    gap: 3rem;
  }
}

@media (max-width: 868px) {
  .hero-content-wrapper {
    grid-template-columns: 1fr;
    text-align: center;
    padding-top: 2rem;
  }

  .hero-text-content {
    order: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .hero-visual-content {
    order: 1;
  }

  .hero-actions {
    justify-content: center;
  }

  .about-grid {
    grid-template-columns: 1fr;
  }

  .project-card,
  .project-card.featured {
    grid-template-columns: 1fr;
  }

  .project-image-wrapper {
    border-right: none;
    border-bottom: 1px solid var(--border-color);
    aspect-ratio: 16/9;
  }

  .project-details {
    padding: 2rem;
  }

  .contact-wrapper {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
}

@media (max-width: 580px) {
  .menu-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 300px;
    height: 100vh;
    background-color: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
    padding: 6rem 2rem 2rem;
    transition: right var(--transition-smooth);
    box-shadow: var(--shadow-lg);
  }

  .nav-menu.open {
    right: 0;
  }

  .nav-list {
    flex-direction: column;
    gap: 1.5rem;
  }

  .nav-link {
    font-size: 1.2rem;
  }

  .menu-toggle.open .bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }

  .menu-toggle.open .bar:nth-child(2) {
    opacity: 0;
  }

  .menu-toggle.open .bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }

  .form-row {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .contact-form-container {
    padding: 1.75rem;
  }

  /* Make target size comfortable for coarse pointer (touch) */
  @media (pointer: coarse) {
    .nav-link,
    .tab-btn {
      min-block-size: 44px;
    }
  }
}

/* Theme Customizer */
.theme-customizer {
  position: fixed;
  right: 2rem;
  bottom: 2rem;
  z-index: 1000;
  display: flex;
  align-items: flex-end;
  flex-direction: column;
  gap: 0.5rem;
}

.customizer-toggle {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--color-secondary);
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-md), 0 0 15px rgba(6, 182, 212, 0.1);
  transition: all var(--transition-smooth);
  backdrop-filter: blur(12px);
  box-sizing: border-box;
}

.customizer-toggle:hover {
  transform: rotate(30deg) scale(1.05);
  border-color: var(--color-secondary);
  color: var(--color-accent);
  box-shadow: var(--shadow-lg), 0 0 25px rgba(6, 182, 212, 0.25);
}

.customizer-panel {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  padding: 1rem 1.25rem;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(16px);
  width: max-content;
  transform: translateY(20px);
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition-smooth);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  box-sizing: border-box;
}

.theme-customizer.open .customizer-panel {
  transform: translateY(0);
  opacity: 1;
  pointer-events: all;
}

.customizer-panel h4 {
  font-size: 0.85rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  text-transform: uppercase;
  margin: 0;
}

.color-options {
  display: flex;
  gap: 0.75rem;
}

.color-opt {
  display: inline-block;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
  box-sizing: border-box;
}

.color-opt:hover {
  transform: scale(1.15);
}

.color-opt.active {
  border-color: var(--text-primary);
  transform: scale(1.1);
  box-shadow: 0 0 10px rgba(255, 255, 255, 0.2);
}

.customizer-toggle:focus-visible,
.color-opt:focus-visible {
  outline: 2px solid var(--color-secondary);
  outline-offset: 3px;
}