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

    :root {
      --bg: #0f172a;
      --card: rgba(255, 255, 255, 0.08);
      --border: rgba(255, 255, 255, 0.12);
      --text: #f8fafc;
      --muted: #94a3b8;
      --accent: #8b5cf6;
      --accent-2: #06b6d4;
      --danger: #ef4444;
      --shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
      --radius: 24px;
    }

    body {
      min-height: 100vh;
      font-family: Inter, system-ui, sans-serif;
      background: radial-gradient(circle at top left, #312e81, transparent 30%),
        radial-gradient(circle at bottom right, #0f766e, transparent 30%),
        var(--bg);
      color: var(--text);
      padding: 40px 20px;
      display: flex;
      justify-content: center;
    }

    .app {
      width: 100%;
      max-width: 1200px;
      display: grid;
      grid-template-columns: 380px 1fr;
      gap: 24px;
    }

    .panel {
      background: var(--card);
      backdrop-filter: blur(18px);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      box-shadow: var(--shadow);
    }

    .sidebar {
      padding: 28px;
      display: flex;
      flex-direction: column;
      gap: 28px;
    }

    .back-btn{
      text-decoration:none;
      color:white;
      padding:14px 22px;
      border-radius:16px;
      background:linear-gradient(135deg,var(--primary),var(--primary-2));
      font-weight:600;
      transition:.3s ease;
      box-shadow:var(--shadow);
    }

    .back-btn:hover{
      transform:translateY(-3px);
    }

    .title {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .title h1 {
      font-size: 2rem;
      font-weight: 800;
      letter-spacing: -1px;
    }

    .title p {
      color: var(--muted);
      line-height: 1.5;
    }

    .control-group {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .label {
      font-size: 0.9rem;
      color: var(--muted);
      font-weight: 600;
      letter-spacing: 0.4px;
    }

    select,
    input[type="number"] {
      width: 100%;
      background: rgba(255,255,255,0.06);
      border: 1px solid rgba(255,255,255,0.1);
      color: white;
      padding: 14px;
      border-radius: 14px;
      outline: none;
      transition: 0.25s ease;
      font-size: 0.95rem;
    }

    select:focus,
    input[type="number"]:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 4px rgba(139, 92, 246, 0.15);
    }

    input[type="range"] {
      width: 100%;
      accent-color: var(--accent);
      cursor: pointer;
    }

    .angle-display {
      font-size: 1.2rem;
      font-weight: 700;
      color: white;
    }

    .stops {
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .stop {
      display: grid;
      grid-template-columns: 60px 1fr auto;
      gap: 12px;
      align-items: center;
      background: rgba(255,255,255,0.04);
      padding: 12px;
      border-radius: 16px;
    }

    input[type="color"] {
      width: 60px;
      height: 52px;
      border: none;
      border-radius: 14px;
      overflow: hidden;
      background: none;
      cursor: pointer;
    }

    .delete-btn {
      width: 42px;
      height: 42px;
      border: none;
      border-radius: 12px;
      background: rgba(239, 68, 68, 0.15);
      color: #f87171;
      cursor: pointer;
      font-size: 1.2rem;
      transition: 0.2s ease;
    }

    .delete-btn:hover {
      background: rgba(239, 68, 68, 0.25);
      transform: scale(1.05);
    }

    .add-btn,
    .copy-btn {
      border: none;
      background: linear-gradient(
        135deg,
        var(--accent),
        var(--accent-2)
      );
      color: white;
      padding: 14px 18px;
      border-radius: 16px;
      font-weight: 700;
      cursor: pointer;
      transition: 0.25s ease;
      font-size: 0.95rem;
    }

    .add-btn:hover,
    .copy-btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 10px 30px rgba(139, 92, 246, 0.35);
    }

    .preview-panel {
      padding: 24px;
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .preview {
      flex: 1;
      min-height: 420px;
      border-radius: 28px;
      position: relative;
      overflow: hidden;
      border: 1px solid rgba(255,255,255,0.08);
    }

    .preview::before {
      content: "";
      position: absolute;
      inset: 0;
      background:
        linear-gradient(
          rgba(255,255,255,0.06),
          transparent
        );
      pointer-events: none;
    }

    .toolbar {
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
    }

    .code-box {
      position: relative;
      background: #020617;
      border-radius: 22px;
      padding: 24px;
      border: 1px solid rgba(255,255,255,0.08);
      overflow-x: auto;
    }

    code {
      color: #cbd5e1;
      font-size: 0.95rem;
      line-height: 1.6;
      font-family: Consolas, monospace;
    }

    @media (max-width: 900px) {
      .app {
        grid-template-columns: 1fr;
      }

      .preview {
        min-height: 320px;
      }
    }