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

    :root {
      --bg: #070b17;
      --card: rgba(18, 24, 42, 0.78);
      --border: rgba(255,255,255,0.08);
      --text: #f5f7ff;
      --muted: #a8b0d3;
      --primary: linear-gradient(135deg, #7c5cff, #00c2ff);
      --shadow: 0 25px 50px rgba(0,0,0,0.45);
    }

    body {
      font-family: 'Inter', sans-serif;
      background:
        radial-gradient(circle at top left, rgba(124,92,255,0.3), transparent 30%),
        radial-gradient(circle at bottom right, rgba(0,194,255,0.25), transparent 35%),
        var(--bg);
      min-height: 100vh;
      color: var(--text);
      padding: 40px 20px;
      overflow-x: hidden;
    }

    .container {
      max-width: 1300px;
      margin: auto;
    }

    .hero {
      text-align: center;
      margin-bottom: 40px;
    }

    .hero a {
      margin-top: -30px;
      float:right;
      margin-bottom: 20px;
      color: #ffffff;
      -webkit-text-decoration: none;
      -moz-text-decoration: none;
      text-decoration: none;
    }

    .hero h1 {
      font-size: clamp(2.5rem, 6vw, 4.5rem);
      font-weight: 800;
      background: var(--primary);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 14px;
    }

    .hero p {
      color: var(--muted);
      font-size: 1.05rem;
      max-width: 800px;
      margin: auto;
      line-height: 1.7;
    }

    .grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
      gap: 28px;
    }

    .card {
      background: var(--card);
      backdrop-filter: blur(16px);
      border: 1px solid var(--border);
      border-radius: 28px;
      padding: 28px;
      box-shadow: var(--shadow);
      position: relative;
      overflow: hidden;
    }

    .card::before {
      content: '';
      position: absolute;
      width: 180px;
      height: 180px;
      background: rgba(124,92,255,0.16);
      border-radius: 50%;
      top: -90px;
      right: -90px;
      filter: blur(10px);
    }

    .card h2 {
      font-size: 1.4rem;
      margin-bottom: 24px;
      position: relative;
      z-index: 1;
    }

    .form-group {
      margin-bottom: 20px;
      position: relative;
      z-index: 1;
    }

    label {
      display: block;
      margin-bottom: 8px;
      font-size: 0.95rem;
      color: var(--muted);
    }

    input,
    select,
    textarea {
      width: 100%;
      border: 1px solid rgba(255,255,255,0.08);
      background: rgba(255,255,255,0.04);
      color: white;
      border-radius: 16px;
      padding: 14px 16px;
      font-size: 0.95rem;
      transition: 0.3s ease;
      outline: none;
    }

    textarea {
      min-height: 150px;
      resize: vertical;
      font-family: monospace;
    }

    input:focus,
    select:focus,
    textarea:focus {
      border-color: #7c5cff;
      box-shadow: 0 0 0 4px rgba(124,92,255,0.2);
    }

    .button-row {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-top: 24px;
      position: relative;
      z-index: 1;
    }

    button {
      border: none;
      padding: 14px 22px;
      border-radius: 14px;
      font-size: 0.95rem;
      font-weight: 700;
      cursor: pointer;
      transition: all 0.3s ease;
      color: white;
    }

    .primary-btn {
      background: var(--primary);
      box-shadow: 0 14px 30px rgba(124,92,255,0.35);
    }

    .secondary-btn {
      background: rgba(255,255,255,0.08);
      border: 1px solid rgba(255,255,255,0.08);
    }

    button:hover {
      transform: translateY(-2px) scale(1.01);
    }

    .preview-box {
      background: #02050d;
      border-radius: 20px;
      padding: 22px;
      border: 1px solid rgba(255,255,255,0.06);
      min-height: 450px;
      overflow: auto;
      position: relative;
      z-index: 1;
    }

    pre {
      white-space: pre-wrap;
      word-break: break-word;
      color: #91f7d0;
      line-height: 1.7;
      font-size: 0.92rem;
    }

    .array-preview {
      margin-top: 22px;
      padding: 18px;
      border-radius: 18px;
      background: rgba(255,255,255,0.04);
      border: 1px solid rgba(255,255,255,0.06);
    }

    .array-preview h3 {
      margin-bottom: 12px;
      font-size: 1rem;
    }

    .pill {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: rgba(124,92,255,0.18);
      color: white;
      padding: 10px 14px;
      border-radius: 999px;
      margin: 5px;
      font-size: 0.9rem;
      border: 1px solid rgba(255,255,255,0.08);
    }

    .footer-note {
      margin-top: 50px;
      text-align: center;
      color: var(--muted);
      font-size: 0.9rem;
    }

    @media (max-width: 768px) {
      .card {
        padding: 22px;
      }

      .button-row {
        flex-direction: column;
      }

      button {
        width: 100%;
      }
    }