@import url('design-tokens.css');

/* --------------------------------------------------------------------------
   4. Components Layer: All UI Elements, Layouts, and Widgets
   -------------------------------------------------------------------------- */
@layer components {
  /* Site Header */
  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    transition: background-color var(--transition-normal), backdrop-filter var(--transition-normal), border-color var(--transition-normal);
    border-bottom: 1px solid transparent;
    padding-block: var(--space-md);
  }

  .site-header.scrolled {
    background-color: light-dark(rgba(248, 250, 252, 0.8), rgba(9, 13, 22, 0.8));
    backdrop-filter: blur(12px);
    border-bottom-color: var(--color-border);
    padding-block: var(--space-xs);
  }

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

  .nav-logo {
    font-family: var(--font-heading);
    font-size: var(--text-lg);
    font-weight: 800;
    color: var(--color-text-primary);
    letter-spacing: -0.5px;
    display: flex;
    align-items: center;
    gap: var(--space-xs);
  }

  .nav-logo-dot {
    width: 8px;
    height: 8px;
    background-color: var(--color-accent);
    border-radius: var(--radius-full);
    display: inline-block;
    box-shadow: 0 0 8px var(--color-accent);
  }

  .nav-menu {
    display: none;
  }

  @media (min-width: 768px) {
    .nav-menu {
      display: flex;
      gap: var(--space-lg);
    }
  }

  .nav-link {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
    position: relative;
    padding-block: var(--space-xxs);
  }

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

  .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: width var(--transition-normal);
  }

  .nav-link:hover::after, .nav-link.active::after {
    width: 100%;
  }

  .header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-md);
  }

  /* Theme Toggle Button */
  .theme-toggle-btn {
    cursor: pointer;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    border: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
  }

  .theme-toggle-btn:hover {
    background-color: var(--color-surface-subtle);
    border-color: var(--color-accent);
  }

  .theme-toggle-btn svg {
    width: 20px;
    height: 20px;
    fill: var(--color-text-primary);
  }

  /* Handle showing sun/moon correctly based on computed theme */
  .sun-icon { display: none; }
  .moon-icon { display: block; }

  :root:has(.theme-dark) .sun-icon,
  html.theme-dark .sun-icon {
    display: block;
  }
  :root:has(.theme-dark) .moon-icon,
  html.theme-dark .moon-icon {
    display: none;
  }

  /* Mobile Hamburger */
  .mobile-menu-toggle {
    cursor: pointer;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
  }

  .mobile-menu-toggle svg {
    width: 24px;
    height: 24px;
    fill: var(--color-text-primary);
  }

  @media (min-width: 768px) {
    .mobile-menu-toggle {
      display: none;
    }
  }

  /* Mobile Drawer Menu */
  .mobile-nav-drawer {
    position: fixed;
    top: 0;
    right: -280px;
    width: 280px;
    height: 100vh;
    background-color: var(--color-surface);
    border-left: 1px solid var(--color-border);
    z-index: 1002;
    padding: var(--space-2xl) var(--space-lg) var(--space-lg);
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-normal) ease-in-out;
  }

  .mobile-nav-drawer.open {
    transform: translateX(-280px);
  }

  .mobile-nav-link {
    font-size: var(--text-base);
    font-weight: 500;
    color: var(--color-text-secondary);
    padding-block: var(--space-sm);
    border-bottom: 1px solid var(--color-border);
    transition: color var(--transition-fast), padding-left var(--transition-fast);
  }

  .mobile-nav-link:hover, .mobile-nav-link.active {
    color: var(--color-accent);
    padding-left: var(--space-xs);
  }

  .nav-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(9, 13, 22, 0.6);
    backdrop-filter: blur(4px);
    z-index: 1001;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-normal);
  }

  .nav-backdrop.visible {
    opacity: 1;
    pointer-events: auto;
  }

  /* Global Section Styling */
  section {
    padding-block: var(--space-3xl);
  }

  .section-title {
    font-size: var(--text-3xl);
    text-align: center;
    margin-block-end: var(--space-xs);
    position: relative;
    display: inline-block;
    left: 50%;
    transform: translateX(-50%);
  }

  .section-title::after {
    content: '';
    display: block;
    width: 40px;
    height: 4px;
    background-color: var(--color-accent);
    margin: var(--space-xs) auto 0;
    border-radius: var(--radius-full);
    box-shadow: 0 0 8px var(--color-accent);
  }

  .section-subtitle {
    text-align: center;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin-inline: auto;
    margin-block-end: var(--space-2xl);
    font-size: var(--text-sm);
  }

  /* Hero Section */
  .hero-section {
    padding-block-start: var(--space-3xl);
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
  }

  /* Cyber Grid Background Effect */
  .hero-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: 
      linear-gradient(var(--color-border) 1px, transparent 1px),
      linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
    background-size: 50px 50px;
    opacity: 0.15;
    pointer-events: none;
    z-index: 1;
  }

  .hero-section::after {
    content: '';
    position: absolute;
    top: 20%;
    left: 50%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(6, 182, 212, 0.1) 0%, transparent 70%);
    pointer-events: none;
    z-index: 1;
    filter: blur(40px);
  }

  .hero-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
    align-items: center;
    position: relative;
    z-index: 2;
  }

  @media (min-width: 992px) {
    .hero-grid {
      grid-template-columns: 1.2fr 0.8fr;
    }
  }

  .hero-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
  }

  .hero-badge {
    background-color: var(--color-surface-subtle);
    color: var(--color-accent);
    border: 1px solid var(--color-border);
    padding: var(--space-xxs) var(--space-sm);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-block-end: var(--space-md);
  }

  .hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    line-height: 1.1;
    margin-block-end: var(--space-sm);
    letter-spacing: -1px;
  }

  .hero-subtitle {
    font-size: var(--text-lg);
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-block-end: var(--space-md);
    border-left: 3px solid var(--color-accent-purple);
    padding-left: var(--space-sm);
  }

  .hero-tagline {
    font-size: var(--text-base);
    color: var(--color-text-secondary);
    margin-block-end: var(--space-xl);
    max-width: 600px;
    line-height: 1.7;
  }

  .hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
  }

  /* Buttons */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-sm) var(--space-lg);
    font-size: var(--text-sm);
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast) var(--transition-spring);
    gap: var(--space-xs);
  }

  .btn-primary {
    background-color: var(--color-accent);
    color: #ffffff;
    box-shadow: 0 4px 14px rgba(6, 182, 212, 0.3);
  }

  .btn-primary:hover {
    background-color: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(6, 182, 212, 0.4);
  }

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

  .btn-secondary:hover {
    background-color: var(--color-surface-subtle);
    border-color: var(--color-accent);
    transform: translateY(-2px);
  }

  /* Pure CSS Animated Systems Diagram */
  .hero-graphics-container {
    position: relative;
    width: 100%;
    aspect-ratio: 1;
    display: flex;
    justify-content: center;
    align-items: center;
  }

  .systems-interactive-diagram {
    width: 100%;
    max-width: 380px;
    height: 100%;
    max-height: 380px;
    position: relative;
  }

  .diagram-core-node {
    width: 100px;
    height: 100px;
    background: radial-gradient(circle, var(--color-surface) 30%, var(--color-surface-subtle) 100%);
    border: 2px solid var(--color-accent);
    border-radius: var(--radius-full);
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 30px rgba(6, 182, 212, 0.3);
    z-index: 5;
    animation: corePulse 4s infinite ease-in-out;
  }

  .diagram-core-node svg {
    width: 48px;
    height: 48px;
    fill: var(--color-accent);
  }

  .diagram-satellite-node {
    width: 60px;
    height: 60px;
    background-color: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-full);
    position: absolute;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-spring);
    cursor: pointer;
    z-index: 4;
  }

  .diagram-satellite-node:hover {
    border-color: var(--color-accent-purple);
    box-shadow: 0 0 15px rgba(129, 140, 248, 0.4);
    transform: scale(1.1);
  }

  .diagram-satellite-node svg {
    width: 28px;
    height: 28px;
    fill: var(--color-text-secondary);
  }

  .diagram-satellite-node:hover svg {
    fill: var(--color-accent-purple);
  }

  /* Satellite positions */
  .node-infra { top: 10%; left: 50%; transform: translateX(-50%); }
  .node-auto { top: 50%; right: 5%; transform: translateY(-50%); }
  .node-marketing { bottom: 10%; left: 50%; transform: translateX(-50%); }
  .node-ops { top: 50%; left: 5%; transform: translateY(-50%); }

  /* Connecting SVG lines */
  .diagram-connections {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 2;
    pointer-events: none;
  }

  .diagram-connection-line {
    stroke: var(--color-border);
    stroke-width: 2;
    stroke-dasharray: 4 4;
  }

  .diagram-pulse-dot {
    fill: var(--color-accent);
    r: 4;
    animation: flowPulse 3s infinite linear;
  }

  .pulse-1 { animation-delay: 0s; }
  .pulse-2 { animation-delay: 0.75s; }
  .pulse-3 { animation-delay: 1.5s; }
  .pulse-4 { animation-delay: 2.25s; }

  /* Animations */
  @keyframes corePulse {
    0%, 100% {
      box-shadow: 0 0 20px rgba(6, 182, 212, 0.2);
      border-color: var(--color-accent);
    }
    50% {
      box-shadow: 0 0 40px rgba(6, 182, 212, 0.5);
      border-color: var(--color-accent-purple);
    }
  }

  @keyframes flowPulse {
    0% {
      offset-distance: 0%;
    }
    100% {
      offset-distance: 100%;
    }
  }

  /* About Section */
  .about-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
    align-items: stretch;
  }

  @media (min-width: 992px) {
    .about-grid {
      grid-template-columns: 1.2fr 0.8fr;
    }
  }

  .about-bio p {
    font-size: var(--text-base);
    margin-block-end: var(--space-lg);
  }

  .about-highlight-box {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
  }

  .about-highlight-title {
    font-size: var(--text-lg);
    margin-block-end: var(--space-lg);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    color: var(--color-accent-purple);
  }

  .about-highlight-title svg {
    width: 24px;
    height: 24px;
    fill: currentColor;
  }

  .about-edu-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
  }

  .about-edu-item {
    display: flex;
    gap: var(--space-md);
  }

  .about-edu-icon {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    background-color: var(--color-surface-subtle);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
  }

  .about-edu-icon svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
  }

  .about-edu-details h4 {
    font-size: var(--text-sm);
    margin-block-end: var(--space-xxs);
  }

  .about-edu-details p {
    font-size: var(--text-xs);
    margin: 0;
  }

  /* Interactive Automation Simulator */
  .simulator-container {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
  }

  .simulator-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: var(--space-md);
    margin-bottom: var(--space-xl);
  }

  .simulator-title-block h3 {
    font-size: var(--text-lg);
    margin-bottom: var(--space-xxs);
  }

  .simulator-title-block p {
    font-size: var(--text-xs);
    margin: 0;
  }

  .simulator-btn {
    padding: var(--space-xs) var(--space-md);
    font-size: var(--text-xs);
  }

  .simulator-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    position: relative;
  }

  @media (min-width: 992px) {
    .simulator-layout {
      grid-template-columns: 1fr auto 1.2fr;
      align-items: center;
    }
  }

  .simulator-column {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
  }

  .simulator-card {
    background-color: var(--color-surface-subtle);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  }

  .simulator-card.active {
    border-color: var(--color-accent);
    box-shadow: 0 0 10px rgba(6, 182, 212, 0.2);
  }

  .simulator-card.success {
    border-color: var(--color-success);
    box-shadow: 0 0 10px rgba(16, 185, 129, 0.2);
  }

  .simulator-card-icon {
    width: 40px;
    height: 40px;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
  }

  .simulator-card.active .simulator-card-icon {
    border-color: var(--color-accent);
    color: var(--color-accent);
  }

  .simulator-card.success .simulator-card-icon {
    border-color: var(--color-success);
    color: var(--color-success);
  }

  .simulator-card-icon svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
  }

  .simulator-card-details h4 {
    font-size: var(--text-sm);
    margin-bottom: var(--space-xxs);
  }

  .simulator-card-details p {
    font-size: var(--text-xs);
    margin: 0;
  }

  .simulator-status-badge {
    margin-left: auto;
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    padding: 2px 6px;
    border-radius: var(--radius-full);
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
  }

  .simulator-card.active .simulator-status-badge {
    border-color: var(--color-accent);
    color: var(--color-accent);
    background-color: rgba(6, 182, 212, 0.1);
  }

  .simulator-card.success .simulator-status-badge {
    border-color: var(--color-success);
    color: var(--color-success);
    background-color: rgba(16, 185, 129, 0.1);
  }

  .simulator-connector-paths {
    display: none;
    width: 80px;
    height: 300px;
  }

  @media (min-width: 992px) {
    .simulator-connector-paths {
      display: block;
    }
  }

  .connector-line {
    fill: none;
    stroke: var(--color-border);
    stroke-width: 2;
    transition: stroke var(--transition-normal);
  }

  .connector-line.active {
    stroke: var(--color-accent);
  }

  .connector-line.success {
    stroke: var(--color-success);
  }

  .data-packet {
    fill: var(--color-accent);
    r: 5;
    visibility: hidden;
  }

  .data-packet.animating {
    visibility: visible;
  }

  /* Expertise / Skill Board */
  .expertise-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  @media (min-width: 768px) {
    .expertise-grid {
      grid-template-columns: repeat(2, 1fr);
    }
  }

  @media (min-width: 992px) {
    .expertise-grid {
      grid-template-columns: repeat(3, 1fr);
    }
  }

  .expertise-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-sm);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
  }

  .expertise-card:hover {
    border-color: var(--color-accent-purple);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
  }

  .expertise-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-block-end: var(--space-md);
  }

  .expertise-icon {
    width: 40px;
    height: 40px;
    background-color: var(--color-surface-subtle);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
    flex-shrink: 0;
  }

  .expertise-icon svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
  }

  .expertise-card h3 {
    font-size: var(--text-md);
  }

  .expertise-skills {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
  }

  .expertise-skill-item {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
  }

  .expertise-skill-item::before {
    content: '';
    width: 6px;
    height: 6px;
    background-color: var(--color-accent-purple);
    border-radius: var(--radius-full);
    flex-shrink: 0;
  }

  /* Timeline */
  .timeline {
    position: relative;
    max-width: 800px;
    margin-inline: auto;
    padding-left: var(--space-lg);
  }

  .timeline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 7px;
    width: 2px;
    height: 100%;
    background-color: var(--color-border);
  }

  .timeline-item {
    position: relative;
    margin-block-end: var(--space-2xl);
  }

  .timeline-node {
    position: absolute;
    left: -27px;
    top: 5px;
    width: 16px;
    height: 16px;
    border-radius: var(--radius-full);
    background-color: var(--color-surface);
    border: 3px solid var(--color-border);
    transition: background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
    z-index: 2;
  }

  .timeline-item:hover .timeline-node {
    border-color: var(--color-accent);
    background-color: var(--color-accent);
    box-shadow: 0 0 10px var(--color-accent);
  }

  .timeline-content {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-sm);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  }

  .timeline-item:hover .timeline-content {
    border-color: var(--color-accent-purple);
    box-shadow: var(--shadow-md);
  }

  .timeline-date {
    font-size: var(--text-xs);
    font-weight: 700;
    color: var(--color-accent-purple);
    display: block;
    margin-block-end: var(--space-xxs);
    text-transform: uppercase;
  }

  .timeline-title {
    font-size: var(--text-base);
    margin-block-end: var(--space-xxs);
  }

  .timeline-company {
    font-size: var(--text-sm);
    color: var(--color-text-primary);
    font-weight: 600;
    margin-block-end: var(--space-sm);
  }

  .timeline-body {
    font-size: var(--text-sm);
    margin: 0;
  }

  /* Projects Card Grid */
  .projects-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  @media (min-width: 768px) {
    .projects-grid {
      grid-template-columns: repeat(2, 1fr);
    }
  }

  .project-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
  }

  .project-card:hover {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
  }

  .project-card-header {
    margin-block-end: var(--space-md);
  }

  .project-tag {
    font-size: 10px;
    font-weight: 700;
    color: var(--color-accent);
    background-color: light-dark(rgba(13, 148, 136, 0.08), rgba(6, 182, 212, 0.08));
    border: 1px solid light-dark(rgba(13, 148, 136, 0.15), rgba(6, 182, 212, 0.15));
    padding: 2px 8px;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    display: inline-block;
    margin-block-end: var(--space-xs);
  }

  .project-card-title {
    font-size: var(--text-md);
    margin-block-end: var(--space-xs);
  }

  .project-card-desc {
    font-size: var(--text-sm);
    margin: 0;
  }

  /* Contact Section */
  .contact-wrapper {
    max-width: 600px;
    margin-inline: auto;
  }

  .contact-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl) var(--space-xl);
    box-shadow: var(--shadow-lg);
    text-align: center;
    position: relative;
    overflow: hidden;
  }

  .contact-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-purple));
  }

  .contact-avatar {
    width: 80px;
    height: 80px;
    background-color: var(--color-surface-subtle);
    border: 2px solid var(--color-accent);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-inline: auto;
    margin-block-end: var(--space-lg);
    color: var(--color-accent);
    box-shadow: 0 0 15px rgba(6, 182, 212, 0.2);
  }

  .contact-avatar svg {
    width: 36px;
    height: 36px;
    fill: currentColor;
  }

  .contact-email-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    background-color: var(--color-surface-subtle);
    border: 1px solid var(--color-border);
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--radius-md);
    font-size: var(--text-base);
    font-family: monospace;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-block-end: var(--space-xl);
  }

  .contact-email-btn:hover {
    border-color: var(--color-accent);
    background-color: var(--color-surface);
    box-shadow: var(--shadow-md);
  }

  .contact-email-btn svg {
    width: 20px;
    height: 20px;
    fill: var(--color-text-secondary);
    transition: fill var(--transition-fast);
  }

  .contact-email-btn:hover svg {
    fill: var(--color-accent);
  }

  .contact-info-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    align-items: center;
    margin-block-end: var(--space-xl);
  }

  .contact-info-item {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
  }

  .contact-info-item svg {
    width: 18px;
    height: 18px;
    fill: currentColor;
  }

  .contact-socials {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
  }

  .contact-social-link {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    border: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    color: var(--color-text-secondary);
  }

  .contact-social-link:hover {
    color: var(--color-accent);
    border-color: var(--color-accent);
    transform: translateY(-2px);
    background-color: var(--color-surface-subtle);
  }

  .contact-social-link svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
  }

  /* Copy feedback message */
  .copy-feedback {
    position: absolute;
    bottom: var(--space-sm);
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background-color: var(--color-success);
    color: #ffffff;
    padding: var(--space-xxs) var(--space-md);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 600;
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-normal) var(--transition-spring);
    box-shadow: var(--shadow-sm);
  }

  .copy-feedback.visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }

  /* Footer */
  .site-footer {
    border-top: 1px solid var(--color-border);
    padding-block: var(--space-xl);
    background-color: var(--color-surface-subtle);
    text-align: center;
  }

  .footer-text {
    font-size: var(--text-xs);
    color: var(--color-text-secondary);
    margin: 0;
  }
}

/* --------------------------------------------------------------------------
   5. Keyframe Animations
   -------------------------------------------------------------------------- */
@keyframes corePulse {
  0%, 100% {
    box-shadow: 0 0 20px rgba(6, 182, 212, 0.2);
    border-color: var(--color-accent);
  }
  50% {
    box-shadow: 0 0 40px rgba(6, 182, 212, 0.5);
    border-color: var(--color-accent-purple);
  }
}