/* CSS Variables for themes */
    :root {
      --color-bg-dark: #0f111a;
      --color-bg-light: #f7f9fc;
      --color-text-dark: #e0e0e0;
      --color-text-light: #333333;
      --color-primary: #7f5af0;
      --color-primary-hover: #9266f9;
      --color-accent1: #ff79c6;
      --color-accent2: #56d0e3;
      --color-accent3: #fbb32d;
      --color-card-bg-dark: rgba(31, 34, 50, 0.75);
      --color-card-bg-light: rgba(255, 255, 255, 0.9);
      --transition-fast: 0.3s ease;
      --border-radius: 12px;
      --font-family: 'Poppins', sans-serif;
    }
    /* Dark Mode defaults */
    html {
      color-scheme: dark;
      background-color: var(--color-bg-dark);
      color: var(--color-text-dark);
      font-family: var(--font-family);
      scroll-behavior: smooth;
    }
    body {
      margin: 0;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      background: var(--color-bg-dark);
      transition: background-color var(--transition-fast), color var(--transition-fast);
    }
    /* Light mode */
    html[data-theme='light'] {
      background-color: var(--color-bg-light);
      color: var(--color-text-light);
      color-scheme: light;
    }
    html[data-theme='light'] body {
      background: var(--color-bg-light);
      color: var(--color-text-light);
    }

    /* Utility */
    a {
      color: inherit;
      text-decoration: none;
      transition: color var(--transition-fast);
    }
    a:hover, a:focus {
      color: var(--color-primary);
      outline: none;
    }
    h1, h2, h3, h4 {
      margin: 0 0 1rem 0;
      font-weight: 800;
      line-height: 1.1;
    }
    p {
      margin: 0 0 1rem 0;
      font-weight: 300;
      line-height: 1.6;
    }

    /* Container max-width and spacing */
    .container {
      width: min(90%, 1200px);
      margin-left: auto;
      margin-right: auto;
      padding-top: 2rem;
      padding-bottom: 4rem;
    }

    /* Header */
    header {
      position: sticky;
      top: 0;
      background: var(--color-bg-dark);
      background: var(--color-card-bg-dark);
      backdrop-filter: saturate(180%) blur(12px);
      box-shadow: 0 4px 12px rgb(0 0 0 / 0.35);
      z-index: 100;
      padding: 0 2rem;
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 64px;
      transition: background-color var(--transition-fast);
    }
    html[data-theme='light'] header {
      background: var(--color-card-bg-light);
      box-shadow: 0 2px 8px rgb(0 0 0 / 0.1);
    }
    .logo {
      font-size: 1.5rem;
      font-weight: 800;
      color: var(--color-primary);
      cursor: default;
      user-select: none;
    }
    nav {
      display: flex;
      gap: 1.25rem;
    }
    nav a {
      font-weight: 600;
      font-size: 1rem;
      padding: 0.5rem 0.75rem;
      border-radius: var(--border-radius);
      transition: background-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
      color: var(--color-text-dark);
    }
    html[data-theme='light'] nav a {
      color: var(--color-text-light);
    }
    nav a:hover,
    nav a:focus {
      background-color: var(--color-primary);
      color: white;
      transform: scale(1.05);
      outline: none;
    }

    /* Theme toggle switch */
    .theme-toggle {
      cursor: pointer;
      background: transparent;
      border: none;
      color: var(--color-primary);
      font-weight: 700;
      font-size: 1.2rem;
      display: flex;
      align-items: center;
      gap: 0.5rem;
      user-select: none;
    }
    .theme-toggle svg {
      width: 1.4rem;
      height: 1.4rem;
      fill: var(--color-primary);
      transition: fill var(--transition-fast);
    }
    .theme-toggle:focus {
      outline: 2px solid var(--color-primary);
      outline-offset: 2px;
    }

    /* Sections */
    section {
      padding-top: 6rem;
      padding-bottom: 6rem;
    }

    /* Home Section */
    #home {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      padding-top: 8rem;
      padding-bottom: 8rem;
    }

    #home .profile-photo {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    object-fit: cover;
    box-shadow: var(--shadow-light);
    border: 4px solid var(--color-primary);
    margin-bottom: 1.5rem;
    transition: box-shadow var(--transition-speed);
  }

  body.dark #home .profile-photo {
    box-shadow: var(--shadow-dark);
    border-color: var(--color-accent1);
  }
    #home h1 {
      font-size: clamp(2.5rem, 5vw, 4rem);
      margin-bottom: 0.25rem;
      background: linear-gradient(90deg, #7f5af0, #ff79c6, #56d0e3);
      -webkit-background-clip: text;
      background-clip: text;
      background-clip: text;
      background-clip: text;
      background-clip: text;
      background-clip: text;
      background-clip: text;
      background-clip: text;
      background-clip: text;
      background-clip: text;
      background-clip: text;
      background-clip: text;
      background-clip: text;
      background-clip: text;
      background-clip: text;
      background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    #home p {
      font-size: clamp(1.25rem, 2vw, 1.5rem);
      color: var(--color-text-dark);
      font-weight: 600;
      margin-bottom: 2rem;
      max-width: 600px;
    }
    html[data-theme='light'] #home p {
      color: var(--color-text-light);
    }
    .social-links {
      display: flex;
      gap: 1.5rem;
      justify-content: center;
      font-size: 1.5rem;
      color: var(--color-text-dark);
      transition: color var(--transition-fast);
    }
    html[data-theme='light'] .social-links {
      color: var(--color-text-light);
    }
    .social-links a {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: var(--color-card-bg-dark);
      width: 48px;
      height: 48px;
      border-radius: 50%;
      box-shadow: 0 0 8px transparent;
      transition:
        background-color var(--transition-fast),
        box-shadow var(--transition-fast),
        color var(--transition-fast),
        transform var(--transition-fast);
      cursor: pointer;
      color: var(--color-primary);
    }
    html[data-theme='light'] .social-links a {
      background: var(--color-card-bg-light);
      color: var(--color-primary);
    }
    .social-links a:hover,
    .social-links a:focus {
      box-shadow:
        0 0 10px var(--color-primary),
        0 0 20px var(--color-primary),
        0 0 30px var(--color-primary);
      background-color: var(--color-primary-hover);
      color: white;
      transform: scale(1.1);
      outline: none;
    }

    /* Services Section */
    #services .section-title {
      text-align: center;
      font-size: 2.5rem;
      font-weight: 800;
      margin-bottom: 3rem;
      background: linear-gradient(90deg, #ff79c6, #56d0e3);
      -webkit-background-clip: text;
      background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .services-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit,minmax(280px,1fr));
      gap: 2rem;
    }
    .service-card {
      background: var(--color-card-bg-dark);
      backdrop-filter: saturate(150%) blur(10px);
      border-radius: var(--border-radius);
      padding: 2rem;
      color: var(--color-text-dark);
      box-shadow: 0 4px 18px rgb(127 90 240 / 0.3);
      transition: transform var(--transition-fast), box-shadow var(--transition-fast);
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
    }
    html[data-theme='light'] .service-card {
      background: var(--color-card-bg-light);
      color: var(--color-text-light);
      box-shadow: 0 4px 12px rgb(127 90 240 / 0.15);
    }
    .service-card:hover,
    .service-card:focus-within {
      transform: translateY(-6px);
      box-shadow: 0 12px 36px rgb(127 90 240 / 0.5);
    }
    .service-icon {
      font-size: 4rem;
      margin-bottom: 1.2rem;
      color: var(--color-accent1);
    }
    .service-card h3 {
      margin-bottom: 0.75rem;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--color-primary);
    }
    .service-card p {
      font-weight: 400;
      font-size: 1rem;
      color: var(--color-text-dark);
    }
    html[data-theme='light'] .service-card p {
      color: var(--color-text-light);
    }

    /* Portfolio Section */
    #portfolio .section-title {
      text-align: center;
      font-size: 2.5rem;
      font-weight: 800;
      margin-bottom: 3rem;
      background: linear-gradient(90deg, #56d0e3, #fbb32d);
      -webkit-background-clip: text;
      background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .portfolio-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit,minmax(280px, 1fr));
      gap: 1.6rem;
    }
    .portfolio-item {
      position: relative;
      background: var(--color-card-bg-dark);
      border-radius: var(--border-radius);
      overflow: hidden;
      box-shadow: 0 4px 18px rgb(86 208 227 / 0.25);
      cursor: pointer;
      transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    }
    html[data-theme='light'] .portfolio-item {
      background: var(--color-card-bg-light);
      box-shadow: 0 4px 12px rgb(86 208 227 / 0.15);
    }
    .portfolio-item:hover, .portfolio-item:focus-within {
      transform: translateY(-6px);
      box-shadow: 0 12px 36px rgb(86 208 227 / 0.5);
      outline: none;
    }
    .portfolio-item img {
      display: block;
      width: 100%;
      height: 180px;
      object-fit: cover;
    }
    .portfolio-info {
      padding: 1rem 1.25rem;
    }
    .portfolio-info h4 {
      margin: 0;
      font-weight: 700;
      font-size: 1.2rem;
      color: var(--color-primary);
    }
    .portfolio-info p {
      margin-top: 0.25rem;
      font-size: 0.9rem;
      color: var(--color-text-dark);
      font-weight: 400;
    }
    html[data-theme='light'] .portfolio-info p {
      color: var(--color-text-light);
    }

    /* Contact Section */
    #contact .section-title {
      text-align: center;
      font-size: 2.5rem;
      font-weight: 800;
      margin-bottom: 3rem;
      background: linear-gradient(90deg, #fbb32d, #7f5af0);
      -webkit-background-clip: text;
      background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    form.contact-form {
      max-width: 480px;
      margin-left: auto;
      margin-right: auto;
      display: flex;
      flex-direction: column;
      gap: 1.6rem;
    }
    .form-group {
      position: relative;
      display: flex;
      flex-direction: column;
    }
    input, textarea {
      background: var(--color-card-bg-dark);
      border: none;
      border-radius: var(--border-radius);
      padding: 1rem 1rem 0.5rem 1rem;
      font-size: 1rem;
      color: var(--color-text-dark);
      font-weight: 400;
      resize: vertical;
      min-height: 40px;
      transition: background-color var(--transition-fast), color var(--transition-fast);
    }
    html[data-theme='light'] input,
    html[data-theme='light'] textarea {
      background: var(--color-card-bg-light);
      color: var(--color-text-light);
    }
    input:focus, textarea:focus {
      outline: none;
      background: var(--color-primary);
      color: #fff;
    }
    label.floating-label {
      position: absolute;
      top: 12px;
      left: 14px;
      font-size: 1rem;
      color: var(--color-text-dark);
      pointer-events: none;
      transition: all 0.2s ease;
      font-weight: 300;
    }
    html[data-theme='light'] label.floating-label {
      color: var(--color-text-light);
    }
    input:focus + label.floating-label,
    input:not(:placeholder-shown) + label.floating-label,
    textarea:focus + label.floating-label,
    textarea:not(:placeholder-shown) + label.floating-label {
      top: -10px;
      left: 10px;
      font-size: 0.75rem;
      font-weight: 600;
      color: var(--color-primary);
      background: var(--color-bg-dark);
      padding: 0 6px;
      border-radius: 8px;
    }
    html[data-theme='light'] input:focus + label.floating-label,
    html[data-theme='light'] input:not(:placeholder-shown) + label.floating-label,
    html[data-theme='light'] textarea:focus + label.floating-label,
    html[data-theme='light'] textarea:not(:placeholder-shown) + label.floating-label {
      background: var(--color-bg-light);
      color: var(--color-primary);
    }
    button.submit-btn {
      background: var(--color-primary);
      border: none;
      border-radius: var(--border-radius);
      padding: 1rem 1.5rem;
      font-weight: 700;
      font-size: 1.2rem;
      color: white;
      cursor: pointer;
      transition: background-color var(--transition-fast), transform var(--transition-fast);
      box-shadow: 0 6px 12px rgb(127 90 240 / 0.5);
      align-self: center;
      width: 100%;
      max-width: 240px;
    }
    button.submit-btn:hover,
    button.submit-btn:focus {
      background: var(--color-primary-hover);
      transform: scale(1.05);
      outline: none;
    }

    /* Footer */
    footer {
      padding: 2rem 2rem 4rem 2rem;
      text-align: center;
      font-weight: 300;
      font-size: 0.9rem;
      color: var(--color-text-dark);
      user-select: none;
    }
    html[data-theme='light'] footer {
      color: var(--color-text-light);
    }

    /* Responsive */
    @media (max-width: 600px) {
      nav {
        gap: 0.75rem;
      }
      nav a {
        font-size: 0.9rem;
        padding: 0.4rem 0.6rem;
      }
      #home h1 {
        font-size: 2.5rem;
      }
      #home p {
        font-size: 1.1rem;
      }
    }