:root {
      --primary: #0a84ff;
      --accent: #dbeafe;
      --background-light: #f1f5f9;
      --background-dark: #1b1f2a;
      --text-light: #1e293b;
      --text-dark: #e2e8f0;
      --white: #ffffff;
      --radius: 10px;

      --primary-dark: #7dd3fc;
      --accent-dark: #273043;
    }

    [data-theme="light"] {
      --background: var(--background-light);
      --text: var(--text-light);
      --primary-theme: var(--primary);
      --accent-theme: var(--accent);
    }

    [data-theme="dark"] {
      --background: var(--background-dark);
      --text: var(--text-dark);
      --primary-theme: var(--primary-dark);
      --accent-theme: var(--accent-dark);
    }

    html {
      transition: background 0.5s, color 0.5s;
    }

    body {
      background: var(--background);
      color: var(--text);
      font-family: 'Inter', sans-serif;
      margin: 0;
    }

    header {
      background: linear-gradient(to right, var(--accent-theme), var(--white));
      padding: 4rem 2rem;
      position: relative;
      display: flex;
      flex-direction: row;
      align-items: center;
      justify-content: center;
      gap: 2rem;
      flex-wrap: wrap;
    }

    .headshot {
      width: 140px;
      height: 140px;
      border-radius: 50%;
      object-fit: cover;
      border: 3px solid var(--primary-theme);
    }

    .intro {
      text-align: left;
      max-width: 600px;
    }

    .intro h1 {
      font-size: 2.5rem;
      font-weight: 900;
      color: var(--primary-theme);
      margin: 0;
    }

    .intro p {
      font-size: 1.25rem;
      margin-top: 1rem;
      color: var(--text);
    }

    .toggle-theme {
      position: absolute;
      top: 1rem;
      right: 1rem;
      background: var(--primary-theme);
      color: var(--white);
      border: none;
      padding: 0.5rem 1rem;
      border-radius: var(--radius);
      cursor: pointer;
    }

    .theme-toggle-icon {
      position: absolute;
      top: 1rem;
      right: 1rem;
      width: 48px;
      height: 48px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 0;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 50%;
      transition: background 0.3s ease;
    }

    .theme-toggle-icon:hover {
      background: rgba(10, 132, 255, 0.1);
    }

    .theme-toggle-icon .icon {
      position: relative;
      width: 24px;
      height: 24px;
      border-radius: 50%;
      background: var(--primary-theme);
      transition: all 0.5s ease;
      box-shadow: 0 0 0 4px var(--primary-theme);
    }

    .theme-toggle-icon .icon::before {
      content: '';
      position: absolute;
      top: -8px;
      left: -8px;
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--background);
      transform: scale(0);
      transition: transform 0.5s ease;
    }

    [data-theme="dark"] .theme-toggle-icon .icon {
      background: var(--text-dark);
      box-shadow: none;
    }

    [data-theme="dark"] .theme-toggle-icon .icon::before {
      transform: scale(1);
    }

    .theme-toggle-icon {
      position: absolute;
      top: 1rem;
      right: 1rem;
      background: none;
      border: none;
      cursor: pointer;
      padding: 0.5rem;
      border-radius: 50%;
      transition: background 0.3s ease;
      color: var(--primary-theme);
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .theme-toggle-icon:hover {
      background: rgba(10, 132, 255, 0.1);
    }

    /* SVG Icons */
    .theme-toggle-icon svg {
      width: 28px;
      height: 28px;
      transition: opacity 0.3s ease, transform 0.3s ease;
      position: absolute;
    }

    /* Default to light theme — show sun */
    .icon-sun {
      opacity: 1;
      transform: scale(1);
    }
    .icon-moon {
      opacity: 0;
      transform: scale(0.8);
    }

    /* When dark theme is active — show moon */
    [data-theme="dark"] .icon-sun {
      opacity: 0;
      transform: scale(0.8);
    }
    [data-theme="dark"] .icon-moon {
      opacity: 1;
      transform: scale(1);
    }

    .cta {
      margin-top: 1.5rem;
    }

    .cta button {
      background: var(--primary-theme);
      color: var(--white);
      border: none;
      padding: 0.75rem 1.5rem;
      font-size: 1rem;
      border-radius: var(--radius);
      cursor: pointer;
      transition: background 0.3s ease, transform 0.3s ease;
    }

    .cta button:hover {
      background: #006edc;
      transform: scale(1.05);
    }

    section {
      padding: 4rem 2rem;
      max-width: 960px;
      margin: auto;
    }

    .highlight {
      background: var(--accent-theme);
      border-left: 4px solid var(--primary-theme);
      padding: 1rem;
      border-radius: var(--radius);
      margin-bottom: 2rem;
    }

    .grid {
      display: grid;
      gap: 1.5rem;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }

    .card {
      padding: 1.5rem;
      background: var(--white);
      border-radius: var(--radius);
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    [data-theme="dark"] .card {
      background: #1e293b;
    }

    .card:hover {
      transform: translateY(-5px);
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
    }

    footer {
      text-align: center;
      padding: 2rem;
      font-size: 0.9rem;
      background: var(--accent-theme);
      color: var(--text);
    }

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

    #particles-js {
      position: fixed;
      width: 100%;
      height: 100%;
      top: 0;
      left: 0;
      z-index: -1;
    }

    form {
      display: flex;
      flex-direction: column;
      gap: 1rem;
      margin-top: 2rem;
    }

    form input, form select, form textarea {
      padding: 0.75rem;
      border-radius: var(--radius);
      border: 1px solid #ccc;
      font-size: 1rem;
      font-family: 'Inter', sans-serif;
    }

    form button {
      align-self: start;
      background: var(--primary-theme);
      color: var(--white);
      padding: 0.75rem 1.5rem;
      border: none;
      border-radius: var(--radius);
      cursor: pointer;
    }