/* styles.css */
@layer settings, structure, components, adjustments, screens, overrides;

@layer settings {
  :root {
    --color-bg: #fff;
    --color-bg-secondary: #f8fafc;
    --color-bg-tertiary: #f1f5f9;
    --color-text: #1e293b;
    --color-text-secondary: #64748b;
    --color-text-muted: #94a3b8;
    --color-primary: #3b82f6;
    --color-primary-hover: #2563eb;
    --color-primary-light: #dbeafe;
    --color-secondary: #8b5cf6;
    --color-accent: #f59e0b;
    --color-accent-hover: #d97706;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;
    --color-shadow: #0f172a14;
    --color-shadow-hover: #0f172a26;
    --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-code: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, "Courier New", monospace;
    --font-size-xs: .75rem;
    --font-size-sm: .875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    --space-1: .25rem;
    --space-2: .5rem;
    --space-3: .75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --radius-sm: .375rem;
    --radius-md: .5rem;
    --radius-lg: .75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    --shadow-sm: 0 1px 2px 0 var(--color-shadow);
    --shadow-md: 0 4px 6px -1px var(--color-shadow), 0 2px 4px -1px #0f172a0f;
    --shadow-lg: 0 10px 15px -3px var(--color-shadow), 0 4px 6px -2px #0f172a0d;
    --shadow-xl: 0 20px 25px -5px var(--color-shadow), 0 10px 10px -5px #0f172a0a;
    --transition-fast: .15s cubic-bezier(.4, 0, .2, 1);
    --transition-normal: .25s cubic-bezier(.4, 0, .2, 1);
    --transition-slow: .35s cubic-bezier(.4, 0, .2, 1);
  }

  [data-theme="light"], :root {
    --color-bg: #fff;
    --color-bg-secondary: #f8fafc;
    --color-bg-tertiary: #f1f5f9;
    --color-text: #1e293b;
    --color-text-secondary: #64748b;
    --color-text-muted: #94a3b8;
    --color-primary: #3b82f6;
    --color-primary-hover: #2563eb;
    --color-primary-light: #dbeafe;
    --color-secondary: #8b5cf6;
    --color-accent: #f59e0b;
    --color-accent-hover: #d97706;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;
    --color-shadow: #0f172a14;
    --color-shadow-hover: #0f172a26;
  }

  [data-theme="dark"] {
    --color-bg: #0f172a;
    --color-bg-secondary: #1e293b;
    --color-bg-tertiary: #334155;
    --color-text: #f1f5f9;
    --color-text-secondary: #cbd5e1;
    --color-text-muted: #94a3b8;
    --color-primary: #60a5fa;
    --color-primary-hover: #3b82f6;
    --color-primary-light: #3b82f61a;
    --color-secondary: #a78bfa;
    --color-accent: #fbbf24;
    --color-accent-hover: #f59e0b;
    --color-success: #34d399;
    --color-warning: #fbbf24;
    --color-error: #f87171;
    --color-border: #475569;
    --color-border-light: #334155;
    --color-shadow: #0000004d;
    --color-shadow-hover: #00000080;
  }

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

  * {
    margin: 0;
    padding: 0;
  }

  html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    -ms-text-size-adjust: 100%;
  }

  body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
    overflow-x: hidden;
  }

  h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: var(--line-height-tight);
    color: var(--color-text);
    margin-bottom: var(--space-4);
    letter-spacing: -.025em;
  }

  h1 {
    font-size: clamp(var(--font-size-3xl), 4vw, var(--font-size-4xl));
    margin-bottom: var(--space-6);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
  }

  h2 {
    font-size: var(--font-size-3xl);
    margin-top: var(--space-12);
    margin-bottom: var(--space-6);
    position: relative;
  }

  h2:before {
    content: "";
    position: absolute;
    left: 0;
    bottom: -8px;
    width: 3rem;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    border-radius: var(--radius-full);
  }

  h3 {
    font-size: var(--font-size-2xl);
    margin-top: var(--space-8);
    color: var(--color-primary);
  }

  h4 {
    font-size: var(--font-size-xl);
    margin-top: var(--space-6);
    font-weight: 600;
  }

  h5 {
    font-size: var(--font-size-lg);
    margin-top: var(--space-5);
    font-weight: 600;
  }

  p {
    margin-bottom: var(--space-4);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-secondary);
  }

  p:last-child {
    margin-bottom: 0;
  }

  strong, b {
    font-weight: 700;
    color: var(--color-text);
  }

  em, i {
    font-style: italic;
  }

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

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

  a:not(.btn):not(.nav-link):after {
    content: "";
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -2px;
    left: 0;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    transition: width var(--transition-normal);
  }

  a:not(.btn):not(.nav-link):hover:after {
    width: 100%;
  }

  code {
    font-family: var(--font-code);
    font-size: .875em;
    background-color: var(--color-bg-tertiary);
    color: var(--color-accent);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-sm);
    font-weight: 500;
  }

  pre {
    font-family: var(--font-code);
    background-color: var(--color-bg-tertiary);
    padding: var(--space-6);
    border-radius: var(--radius-lg);
    overflow-x: auto;
    border: 1px solid var(--color-border);
    position: relative;
    margin: var(--space-6) 0;
  }

  pre code {
    background: none;
    padding: 0;
    color: var(--color-text);
  }

  blockquote {
    border-left: 4px solid var(--color-primary);
    background-color: var(--color-primary-light);
    padding: var(--space-6);
    margin: var(--space-8) 0;
    border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
    position: relative;
    font-style: italic;
    font-size: var(--font-size-lg);
  }

  blockquote:before {
    content: "\"";
    font-size: 4rem;
    color: var(--color-primary);
    position: absolute;
    top: -10px;
    left: var(--space-4);
    line-height: 1;
    opacity: .3;
  }

  ul, ol {
    margin-bottom: var(--space-6);
    padding-left: var(--space-8);
  }

  li {
    margin-bottom: var(--space-2);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-secondary);
  }

  ul li {
    position: relative;
  }

  ul li::marker {
    content: "▸ ";
    color: var(--color-primary);
    font-weight: bold;
  }

  img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal);
  }

  img:hover {
    transform: scale(1.02);
  }

  hr {
    border: none;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-border), transparent);
    margin: var(--space-12) 0;
  }

  ::selection {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
  }
}

@layer structure {
  body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
  }

  header {
    background: #fffffff2;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border-light);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: all var(--transition-normal);
  }

  header.scrolled {
    box-shadow: var(--shadow-lg);
    background: #fffffffa;
  }

  nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-4) var(--space-6);
    display: flex;
    justify-content: space-between;
    align-items:  center;
  }

  .nav-brand {
    font-size: var(--font-size-xl);
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
  }

  .nav-links {
    display: flex;
    list-style: none;
    gap: var(--space-8);
    padding: 0;
    margin: 0;
  }

  .nav-link {
    color: var(--color-text-secondary);
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
  }

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

  .nav-link:after {
    content: "";
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--color-primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-normal);
  }

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

  main {
    flex: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-12) var(--space-6);
    width: 100%;
    animation: fadeInUp .6s ease-out;
  }

  @keyframes fadeInUp {
    from {
      opacity: 0;
      transform: translateY(20px);
    }

    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: var(--space-8) var(--space-6);
    text-align: center;
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
  }

  footer p {
    margin: 0;
    color: var(--color-text-muted);
  }
}

@layer components {
  .btn {
    display: inline-flex;
    align-items:  center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
  }

  .btn:before {
    content: "";
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, #0000, #fff3, #0000);
    transition: left var(--transition-slow);
  }

  .btn:hover:before {
    left: 100%;
  }

  .btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-hover));
    color: #fff;
    box-shadow: var(--shadow-md);
  }

  .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
  }

  .btn-secondary {
    background: #fff;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
  }

  .btn-secondary:hover {
    background: var(--color-primary);
    color: #fff;
    transform: translateY(-2px);
  }

  .card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    margin-bottom: var(--space-8);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
  }

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

  .card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-primary-light);
  }

  .card h3 {
    margin-top: 0;
    margin-bottom: var(--space-4);
  }

  .skill-rating {
    display: flex;
    align-items:  center;
    gap: var(--space-2);
    margin: var(--space-2) 0;
  }

  .stars {
    display: flex;
    gap: var(--space-1);
  }

  .star {
    width: 16px;
    height: 16px;
    background: var(--color-border);
    border-radius: var(--radius-sm);
    position: relative;
    overflow: hidden;
  }

  .star.filled:before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-hover));
    animation: fillStar .3s ease-out;
  }

  @keyframes fillStar {
    from {
      width: 0;
    }

    to {
      width: 100%;
    }
  }

  .progress-bar {
    width: 100%;
    height: 8px;
    background: var(--color-border-light);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin: var(--space-2) 0;
  }

  .progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    border-radius: var(--radius-full);
    transition: width 1s ease-out;
    animation: progressAnimation 2s ease-out;
  }

  @keyframes progressAnimation {
    from {
      width: 0;
    }

    to {
      width: var(--progress-width, 0%);
    }
  }

  .badge {
    display: inline-flex;
    align-items:  center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-3);
    background: var(--color-primary-light);
    color: var(--color-primary);
    font-size: var(--font-size-xs);
    font-weight: 600;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: .05em;
  }

  .timeline {
    position: relative;
    padding-left: var(--space-8);
  }

  .timeline:before {
    content: "";
    position: absolute;
    left: var(--space-4);
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--color-primary), var(--color-secondary));
  }

  .timeline-item {
    position: relative;
    padding-bottom: var(--space-8);
  }

  .timeline-item:before {
    content: "";
    position: absolute;
    left: -var(--space-6);
    top: var(--space-2);
    width: 12px;
    height: 12px;
    background: var(--color-primary);
    border-radius: var(--radius-full);
    box-shadow: 0 0 0 4px var(--color-bg), 0 0 0 6px var(--color-primary-light);
  }

  .grid {
    display: grid;
    gap: var(--space-8);
  }

  .grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  }

  .grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  }

  .stats {
    display: flex;
    justify-content: space-around;
    padding: var(--space-8);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-xl);
    margin: var(--space-8) 0;
  }

  .stat {
    text-align: center;
  }

  .stat-number {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-primary);
    display: block;
  }

  .stat-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: .05em;
    font-weight: 600;
  }

  .floating {
    animation: float 6s ease-in-out infinite;
  }

  @keyframes float {
    0%, 100% {
      transform: translateY(0);
    }

    50% {
      transform: translateY(-10px);
    }
  }

  .spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--color-border-light);
    border-top: 4px solid var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
  }

  @keyframes spin {
    0% {
      transform: rotate(0);
    }

    100% {
      transform: rotate(360deg);
    }
  }
}

@layer adjustments {
  .hero-section {
    text-align: center;
    padding: var(--space-20) 0;
    background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-secondary) 100%);
    position: relative;
    overflow: hidden;
  }

  .hero-section:before {
    content: "";
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, var(--color-primary-light) 0%, transparent 70%);
    opacity: .1;
    animation: pulse 4s ease-in-out infinite;
  }

  @keyframes pulse {
    0%, 100% {
      transform: scale(1);
      opacity: .1;
    }

    50% {
      transform: scale(1.1);
      opacity: .2;
    }
  }

  .project-showcase {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-8);
    margin: var(--space-12) 0;
  }

  .project-card {
    background: var(--color-bg);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    border: 1px solid var(--color-border);
  }

  .project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
  }

  .project-image {
    height: 200px;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-secondary));
    position: relative;
    overflow: hidden;
  }

  .project-content {
    padding: var(--space-6);
  }

  .project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin: var(--space-4) 0;
  }

  .project-tag {
    font-size: var(--font-size-xs);
    padding: var(--space-1) var(--space-2);
    background: var(--color-bg-tertiary);
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    font-weight: 500;
  }

  .contact-form {
    max-width: 600px;
    margin: var(--space-12) auto;
    padding: var(--space-8);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
  }

  .form-group {
    margin-bottom: var(--space-6);
  }

  .form-label {
    display: block;
    margin-bottom: var(--space-2);
    font-weight: 600;
    color: var(--color-text);
  }

  .form-input, .form-textarea {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    transition: border-color var(--transition-fast);
    background: var(--color-bg);
  }

  .form-input:focus, .form-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
  }

  .form-textarea {
    min-height: 120px;
    resize: vertical;
  }

  .skill-category {
    margin-bottom: var(--space-12);
  }

  .skill-list {
    display: grid;
    gap: var(--space-4);
  }

  .skill-item {
    display: flex;
    justify-content: space-between;
    align-items:  center;
    padding: var(--space-4);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--color-primary);
  }

  .skill-name {
    font-weight: 600;
    color: var(--color-text);
  }
}

@layer screens {
  @media (max-width: 640px) {
    :root {
      --font-size-4xl: 2rem;
      --font-size-3xl: 1.75rem;
      --font-size-2xl: 1.5rem;
    }

    .mobile-menu-btn {
      display: flex;
    }

    nav {
      padding: var(--space-3) var(--space-4);
      position: relative;
    }

    .nav-links {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: var(--color-bg);
      flex-direction: column;
      justify-content: center;
      align-items:  center;
      gap: var(--space-8);
      transform: translateX(-100%);
      transition: transform var(--transition-normal);
      z-index: 999;
      border-right: 1px solid var(--color-border);
    }

    .nav-links.nav-open {
      transform: translateX(0);
    }

    .nav-link {
      font-size: var(--font-size-lg);
      display: flex;
      align-items:  center;
      gap: var(--space-2);
    }

    body.nav-open {
      overflow: hidden;
    }

    main {
      padding: var(--space-8) var(--space-4);
    }

    h1 {
      font-size: var(--font-size-3xl);
    }

    h2 {
      font-size: var(--font-size-2xl);
      margin-top: var(--space-8);
    }

    .card {
      padding: var(--space-6);
    }

    .btn {
      padding: var(--space-3) var(--space-4);
      font-size: var(--font-size-sm);
    }

    .hero-section {
      padding: var(--space-16) var(--space-4);
    }

    .project-showcase {
      grid-template-columns: 1fr;
      gap: var(--space-6);
    }

    .stats {
      flex-direction: column;
      gap: var(--space-4);
    }

    .grid-2, .grid-3 {
      grid-template-columns: 1fr;
    }

    .skill-item {
      flex-direction: column;
      align-items:  flex-start;
      gap: var(--space-2);
    }

    .footer-content {
      text-align: center;
    }

    .footer-nav ul {
      flex-direction: column;
      gap: var(--space-4);
    }

    .back-to-top {
      bottom: var(--space-4);
      right: var(--space-4);
      width: 45px;
      height: 45px;
    }
  }

  @media (min-width: 641px) and (max-width: 1024px) {
    main {
      padding: var(--space-10) var(--space-6);
    }

    .project-showcase {
      grid-template-columns: repeat(2, 1fr);
    }
  }

  @media (min-width: 1025px) {
    .hero-section {
      padding: var(--space-20) 0;
    }

    .project-showcase {
      grid-template-columns: repeat(3, 1fr);
    }
  }

  @media print {
    * {
      background: #fff !important;
      color: #000 !important;
      box-shadow: none !important;
    }

    header, footer {
      display: none;
    }

    main {
      max-width: none;
      padding: 0;
    }

    .btn, .card {
      border: 1px solid #000;
    }
  }

  @media (prefers-contrast: high) {
    :root {
      --color-bg: #fff;
      --color-text: #000;
      --color-primary: #00e;
      --color-border: #000;
    }
  }

  @media (prefers-reduced-motion: reduce) {
    * {
      animation-duration: .01ms !important;
      animation-iteration-count: 1 !important;
      transition-duration: .01ms !important;
    }
  }
}

@layer overrides {
  @media (prefers-color-scheme: dark) {
    :root:not([data-theme]) {
      --color-bg: #0f1419;
      --color-bg-secondary: #1a1f29;
      --color-bg-tertiary: #252a35;
      --color-text: #e2e8f0;
      --color-text-secondary: #94a3b8;
      --color-text-muted: #64748b;
      --color-primary: #60a5fa;
      --color-primary-hover: #3b82f6;
      --color-primary-light: #60a5fa1a;
      --color-secondary: #a78bfa;
      --color-accent: #fbbf24;
      --color-accent-hover: #f59e0b;
      --color-success: #34d399;
      --color-warning: #fbbf24;
      --color-error: #f87171;
      --color-border: #374151;
      --color-border-light: #2d3748;
      --color-shadow: #0000004d;
      --color-shadow-hover: #00000080;
    }

    body {
      background-color: var(--color-bg);
      color: var(--color-text);
    }

    header {
      background: #0f1419f2;
      backdrop-filter: blur(10px);
    }

    header.scrolled {
      background: #0f1419fa;
    }

    .card {
      background: var(--color-bg-secondary);
      border-color: var(--color-border);
    }

    .card:hover {
      border-color: var(--color-primary-light);
    }

    blockquote {
      background-color: #60a5fa0d;
      border-left-color: var(--color-primary);
    }

    pre {
      background-color: var(--color-bg-tertiary);
      border-color: var(--color-border);
    }

    code {
      background-color: var(--color-bg-tertiary);
      color: var(--color-accent);
    }

    .hero-section {
      background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-secondary) 100%);
    }

    .contact-form {
      background: var(--color-bg-secondary);
    }

    .form-input, .form-textarea {
      background: var(--color-bg-tertiary);
      border-color: var(--color-border);
      color: var(--color-text);
    }

    .form-input:focus, .form-textarea:focus {
      border-color: var(--color-primary);
      box-shadow: 0 0 0 3px #60a5fa1a;
    }

    .skill-item {
      background: var(--color-bg-secondary);
    }

    .stats {
      background: var(--color-bg-secondary);
    }

    .project-card {
      background: var(--color-bg-secondary);
      border-color: var(--color-border);
    }

    .project-tag {
      background: var(--color-bg-tertiary);
      color: var(--color-text-secondary);
    }

    ::selection {
      background-color: #60a5fa33;
      color: var(--color-primary);
    }
  }

  .mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items:  center;
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-2);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
  }

  .hamburger-line {
    width: 20px;
    height: 2px;
    background: var(--color-text);
    transition: all var(--transition-fast);
    margin: 2px 0;
    border-radius: var(--radius-full);
  }

  .mobile-menu-btn[aria-expanded="true"] .hamburger-line:first-child {
    transform: rotate(45deg)translate(5px, 5px);
  }

  .mobile-menu-btn[aria-expanded="true"] .hamburger-line:nth-child(2) {
    opacity: 0;
  }

  .mobile-menu-btn[aria-expanded="true"] .hamburger-line:nth-child(3) {
    transform: rotate(-45deg)translate(7px, -6px);
  }

  .theme-toggle {
    position: relative;
    width: 40px;
    height: 40px;
    border: none;
    border-radius: var(--radius-full);
    background: var(--color-bg-secondary);
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items:  center;
    justify-content: center;
  }

  .theme-toggle:hover {
    background: var(--color-primary-light);
    transform: scale(1.05);
  }

  .theme-icon {
    position: absolute;
    font-size: 1.2em;
    transition: all var(--transition-normal);
    left: 50%;
    top: 50%;
    transform-origin: center;
    transform: translate(-50%, -50%);
  }

  .theme-icon-light {
    opacity: 1;
    transform: translate(-50%, -50%)rotate(0);
  }

  .theme-icon-dark {
    opacity: 0;
    transform: translate(-50%, -50%)rotate(-90deg);
  }

  [data-theme="dark"] .theme-icon-light {
    opacity: 0;
    transform: translate(-50%, -50%)rotate(90deg);
  }

  [data-theme="dark"] .theme-icon-dark {
    opacity: 1;
    transform: translate(-50%, -50%)rotate(0);
  }

  .reading-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--color-border-light);
  }

  .reading-progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    width: 0%;
    transition: width .1s ease-out;
  }

  .back-to-top {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    width: 50px;
    height: 50px;
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-normal);
    opacity: 0;
    visibility: hidden;
    transform: translateY(100px);
    z-index: 1000;
    font-size: 1.5em;
    display: flex;
    align-items:  center;
    justify-content: center;
  }

  .back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .back-to-top:hover {
    background: var(--color-primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
  }

  .page-header {
    margin-bottom: var(--space-12);
    text-align: center;
  }

  .breadcrumb {
    margin-top: var(--space-4);
  }

  .breadcrumb ol {
    display: flex;
    justify-content: center;
    list-style: none;
    padding: 0;
    margin: 0;
    gap: var(--space-2);
  }

  .breadcrumb li {
    display: flex;
    align-items:  center;
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
  }

  .breadcrumb li:not(:last-child):after {
    content: "→";
    margin-left: var(--space-2);
    color: var(--color-text-muted);
  }

  .breadcrumb a {
    color: var(--color-primary);
    text-decoration: none;
  }

  .footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items:  center;
    gap: var(--space-6);
  }

  .footer-nav ul {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    list-style: none;
    padding: 0;
    margin: 0;
    gap: var(--space-6);
  }

  .footer-nav a {
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
  }

  .footer-nav a:hover {
    color: var(--color-primary);
  }

  .social-links {
    display: flex;
    gap: var(--space-4);
  }

  .social-link {
    display: flex;
    align-items:  center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
    text-decoration: none;
    transition: all var(--transition-normal);
    font-size: 1.2em;
  }

  .social-link:hover {
    background: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
  }

  .social-link:hover .social-icon {
    transform: scale(1.1);
  }

  .social-icon {
    transition: transform var(--transition-fast);
  }

  .copyright {
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
  }

  .separator {
    margin: 0 var(--space-2);
    color: var(--color-border);
  }

  .nav-icon {
    margin-right: var(--space-1);
    font-size: 1.1em;
  }

  .animate-in {
    animation: fadeInUp .6s ease-out;
  }

  .animate-in-delay {
    animation: fadeInUp .6s ease-out .2s both;
  }

  .animate-in-delay-2 {
    animation: fadeInUp .6s ease-out .4s both;
  }

  .content {
    max-width: 800px;
    margin: 0 auto;
  }

  .content > * + * {
    margin-top: var(--space-4);
  }

  .text-center {
    text-align: center;
  }

  .text-left {
    text-align: left;
  }

  .text-right {
    text-align: right;
  }

  .mt-4 {
    margin-top: var(--space-4);
  }

  .mt-8 {
    margin-top: var(--space-8);
  }

  .mb-4 {
    margin-bottom: var(--space-4);
  }

  .mb-8 {
    margin-bottom: var(--space-8);
  }

  .p-4 {
    padding: var(--space-4);
  }

  .p-8 {
    padding: var(--space-8);
  }

  .rounded {
    border-radius: var(--radius-md);
  }

  .rounded-lg {
    border-radius: var(--radius-lg);
  }

  .shadow {
    box-shadow: var(--shadow-md);
  }

  .shadow-lg {
    box-shadow: var(--shadow-lg);
  }

  .emoji {
    font-style: normal;
    font-variant: normal;
    font-weight: normal;
    font-size: 1.2em;
    line-height: 1;
    display: inline-block;
  }

  ::-webkit-scrollbar {
    width: 8px;
    height: 8px;
  }

  ::-webkit-scrollbar-track {
    background: var(--color-bg-secondary);
  }

  ::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: var(--radius-full);
  }

  ::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary);
  }

  .btn:focus, .form-input:focus, .form-textarea:focus, .nav-link:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
  }

  .skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--color-primary);
    color: #fff;
    padding: var(--space-2) var(--space-4);
    text-decoration: none;
    border-radius: var(--radius-md);
    z-index: 1000;
    transition: top var(--transition-fast);
  }

  .skip-link:focus {
    top: 6px;
  }
}