* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    :root {
      --color-primary: #ff6b35;
      --color-secondary: #004e89;
      --bg-1: #fafafa;
      --bg-2: #ffffff;
      --bg-highlight: #fff5f0;
      --text-color: #0a0a0a;
      --title-color: #1a1a1a;
      --border-color: #e0e0e0;
      --font-normal: 'DM Sans', sans-serif;
      --font-title: 'Syne', sans-serif;
      --font-size: 16px;
      --border-radius: 16px;
      --border-size: 2px;
      --box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
    }

    body {
      font-family: var(--font-normal);
      background: #0d1117;
      color: #c9d1d9;
      min-height: 100vh;
      font-size: 14px;
    }

    .app-container {
      display: grid;
      grid-template-columns: 400px 1fr;
      height: 100vh;
    }

    .controls-panel {
      background: #161b22;
      border-right: 1px solid #30363d;
      overflow-y: auto;
      padding: 24px;
    }

    .controls-panel::-webkit-scrollbar {
      width: 8px;
    }

    .controls-panel::-webkit-scrollbar-track {
      background: #0d1117;
    }

    .controls-panel::-webkit-scrollbar-thumb {
      background: #30363d;
      border-radius: 4px;
    }

    .preview-panel {
      background: var(--bg-1);
      overflow-y: auto;
      padding: 40px;
      transition: background 0.3s ease;
    }

    .header {
      margin-bottom: 32px;
    }

    .header h1 {
      font-family: var(--font-title);
      font-size: 24px;
      font-weight: 600;
      color: #f0f6fc;
      margin-bottom: 8px;
    }

    .header p {
      font-size: 14px;
      color: #8b949e;
    }

    .section {
      margin-bottom: 32px;
    }

    .section-title {
      font-size: 14px;
      font-weight: 600;
      color: #f0f6fc;
      margin-bottom: 16px;
      text-transform: uppercase;
      letter-spacing: 0.05em;
    }

    .control-group {
      margin-bottom: 16px;
    }

    label {
      display: block;
      margin-bottom: 8px;
      font-size: 12px;
      font-weight: 500;
      color: #8b949e;
      text-transform: uppercase;
      letter-spacing: 0.05em;
    }

    .color-input-wrapper {
      display: flex;
      align-items: center;
      gap: 10px;
      background: #0d1117;
      padding: 6px 10px;
      border-radius: 6px;
      border: 1px solid #30363d;
    }

    .color-input-wrapper:hover {
      border-color: #58a6ff;
    }

    input[type="color"] {
      width: 40px;
      height: 40px;
      border: none;
      border-radius: 4px;
      cursor: pointer;
      background: transparent;
    }

    .color-value {
      font-family: 'Space Mono', monospace;
      font-size: 12px;
      color: #8b949e;
      flex: 1;
    }

    select {
      width: 100%;
      padding: 10px 12px;
      border: 1px solid #30363d;
      border-radius: 6px;
      background: #0d1117;
      color: #c9d1d9;
      font-size: 13px;
      cursor: pointer;
      appearance: none;
      background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L6 6L11 1' stroke='%238b949e' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E");
      background-repeat: no-repeat;
      background-position: right 12px center;
      padding-right: 36px;
    }

    select:hover {
      border-color: #58a6ff;
    }

    input[type="range"] {
      width: 100%;
      height: 6px;
      border-radius: 3px;
      background: #21262d;
      outline: none;
      -webkit-appearance: none;
      margin: 10px 0;
    }

    input[type="range"]::-webkit-slider-thumb {
      -webkit-appearance: none;
      width: 18px;
      height: 18px;
      border-radius: 50%;
      background: #58a6ff;
      cursor: pointer;
      border: 2px solid #0d1117;
    }

    input[type="range"]::-moz-range-thumb {
      width: 18px;
      height: 18px;
      border-radius: 50%;
      background: #58a6ff;
      cursor: pointer;
      border: 2px solid #0d1117;
    }

    .range-value {
      display: block;
      text-align: right;
      font-family: 'Space Mono', monospace;
      font-size: 12px;
      color: #58a6ff;
      margin-bottom: 4px;
    }

    .theme-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 12px;
      margin-top: 16px;
    }

    .theme-card {
      background: #0d1117;
      border: 1px solid #30363d;
      border-radius: 6px;
      padding: 12px;
      cursor: pointer;
      transition: all 0.2s ease;
      position: relative;
    }

    .theme-card:hover {
      border-color: #58a6ff;
      transform: translateY(-2px);
    }

    .theme-card.active {
      border-color: #58a6ff;
      box-shadow: 0 0 0 1px #58a6ff;
    }

    .theme-preview {
      background: #21262d;
      border-radius: 4px;
      padding: 12px;
      margin-bottom: 8px;
      height: 80px;
      position: relative;
      overflow: hidden;
    }

    .theme-preview-bars {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .preview-bar {
      height: 8px;
      border-radius: 4px;
      position: relative;
    }

    .preview-bar-accent {
      position: absolute;
      left: 0;
      top: 0;
      height: 100%;
      border-radius: 4px;
    }

    .theme-name {
      font-size: 12px;
      font-weight: 600;
      color: #c9d1d9;
      margin-bottom: 4px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .theme-delete {
      color: #f85149;
      font-size: 16px;
      cursor: pointer;
      padding: 2px 6px;
      border-radius: 4px;
      opacity: 0;
      transition: opacity 0.2s;
    }

    .theme-card:hover .theme-delete {
      opacity: 1;
    }

    .theme-delete:hover {
      background: #f851491a;
    }

    .button {
      width: 100%;
      padding: 10px 16px;
      border: 1px solid #30363d;
      border-radius: 6px;
      background: #21262d;
      color: #c9d1d9;
      font-size: 13px;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.2s ease;
      margin-bottom: 8px;
    }

    .button:hover {
      background: #30363d;
      border-color: #58a6ff;
    }

    .button.primary {
      background: #238636;
      border-color: #238636;
      color: white;
    }

    .button.primary:hover {
      background: #2ea043;
      border-color: #2ea043;
    }

    .css-output {
      background: #0d1117;
      border: 1px solid #30363d;
      border-radius: 6px;
      padding: 16px;
      margin-top: 16px;
    }

    .css-output textarea {
      width: 100%;
      min-height: 200px;
      background: transparent;
      border: none;
      color: #c9d1d9;
      font-family: 'Space Mono', monospace;
      font-size: 12px;
      resize: vertical;
      outline: none;
    }

    .copy-button {
      padding: 6px 12px;
      background: #21262d;
      border: 1px solid #30363d;
      border-radius: 4px;
      color: #c9d1d9;
      font-size: 12px;
      cursor: pointer;
      margin-top: 8px;
    }

    .copy-button:hover {
      background: #30363d;
    }

    /* Preview content styles */
    .preview-content {
      max-width: 900px;
      margin: 0 auto;
    }

    .preview-section {
      background: var(--bg-2);
      padding: 40px;
      border-radius: var(--border-radius);
      margin-bottom: 24px;
      box-shadow: var(--box-shadow);
      border: var(--border-size) solid var(--border-color);
    }

    h1,
    h2,
    h3 {
      font-family: var(--font-title);
      line-height: 1.2;
      margin-bottom: 16px;
      color: var(--title-color);
    }

    .display-1 {
      font-size: calc(var(--font-size) * 3.5);
      font-weight: 800;
    }

    .display-2 {
      font-size: calc(var(--font-size) * 2.5);
      font-weight: 700;
    }

    .display-3 {
      font-size: calc(var(--font-size) * 1.75);
      font-weight: 600;
    }

    .body-text {
      line-height: 1.7;
      color: var(--text-color);
      margin-bottom: 20px;
      font-size: var(--font-size);
    }

    .text-secondary {
      opacity: 0.7;
    }

    .text-accent {
      color: var(--color-primary);
    }

    .card {
      background: var(--bg-1);
      padding: 28px;
      border-radius: calc(var(--border-radius) / 1.3);
      border: var(--border-size) solid var(--border-color);
      transition: all 0.3s ease;
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--box-shadow);
    }

    .input-demo {
      width: 100%;
      padding: 16px 20px;
      border: var(--border-size) solid var(--border-color);
      border-radius: calc(var(--border-radius) / 1.5);
      background: var(--bg-highlight);
      color: var(--text-color);
      font-size: var(--font-size);
      font-family: var(--font-normal);
      margin-bottom: 20px;
    }

    .input-demo:focus {
      outline: none;
      border-color: var(--color-primary);
      background: var(--bg-2);
    }

    .button-group {
      display: flex;
      gap: 12px;
      flex-wrap: wrap;
      margin: 20px 0;
    }

    .btn-primary {
      padding: 12px 24px;
      border: var(--border-size) solid var(--border-color);
      border-radius: calc(var(--border-radius) / 1.5);
      background: var(--color-primary);
      color: white;
      font-size: 0.95rem;
      font-family: var(--font-normal);
      font-weight: 600;
      cursor: pointer;
    }

    .btn-secondary {
      padding: 12px 24px;
      border: var(--border-size) solid var(--border-color);
      border-radius: calc(var(--border-radius) / 1.5);
      background: var(--color-secondary);
      color: white;
      font-size: 0.95rem;
      font-family: var(--font-normal);
      font-weight: 600;
      cursor: pointer;
    }

    .btn-outline {
      padding: 12px 24px;
      border: var(--border-size) solid var(--color-primary);
      border-radius: calc(var(--border-radius) / 1.5);
      background: transparent;
      color: var(--color-primary);
      font-size: 0.95rem;
      font-family: var(--font-normal);
      font-weight: 600;
      cursor: pointer;
      transition: all 0.3s ease;
    }

    .btn-outline:hover {
      background: var(--color-primary);
      color: white;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 20px;
      margin: 30px 0;
    }

    .stat-card {
      background: var(--bg-1);
      padding: 24px;
      border-radius: calc(var(--border-radius) / 1.3);
      border: var(--border-size) solid var(--border-color);
      text-align: center;
    }

    .stat-value {
      font-size: 2.5rem;
      font-weight: 800;
      font-family: var(--font-title);
      color: var(--color-primary);
      line-height: 1;
    }

    .stat-label {
      font-size: 0.85rem;
      color: var(--text-color);
      opacity: 0.7;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      margin-top: 8px;
    }

    a {
      color: var(--color-primary);
      text-decoration: none;
      border-bottom: 2px solid transparent;
    }

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

    @media (max-width: 1024px) {
      .app-container {
        grid-template-columns: 1fr;
      }

      .controls-panel {
        border-right: none;
        border-bottom: 1px solid #30363d;
        max-height: 50vh;
      }
    }