html, body {
      margin: 0;
      width: 100%;
      height: 100%;
      overflow: hidden;
      font-family: "Times New Roman", Times, serif;
      background: radial-gradient(circle at top, #11233f 0%, #08111f 45%, #02060d 100%);
      color: #eef6ff;
    }

    #container {
      position: fixed;
      inset: 0;
    }

    #titleOverlay {
      position: absolute;
      top: 10px;
      left: 50%;
      transform: translateX(-50%);
      z-index: 20;
      min-width: 360px;
      max-width: 720px;
      padding: 14px 24px;
      text-align: center;
      border-radius: 22px;
      background: rgba(15, 30, 58, 0.84);
      border: 1px solid rgba(255,255,255,0.12);
      box-shadow: 0 12px 28px rgba(0,0,0,0.30);
      backdrop-filter: blur(6px);
    }

    #titleOverlay h1 {
      margin: 0;
      color: #ffe77a;
      font-size: 30px;
      line-height: 1.1;
      font-weight: bold;
    }

    #titleOverlay .sub {
      margin-top: 4px;
      font-size: 14px;
      color: #dfe9ff;
    }

    .panel {
      position: absolute;
      top: 90px;
      z-index: 20;
      border-radius: 22px;
      background: rgba(9, 20, 39, 0.82);
      border: 1px solid rgba(255,255,255,0.10);
      box-shadow: 0 14px 34px rgba(0,0,0,0.34);
      backdrop-filter: blur(7px);
      overflow: hidden;
    }

    #leftPanel {
      left: 18px;
      width: 320px;
      max-height: calc(100vh - 120px);
      overflow-y: auto;
      padding: 16px;
    }

    #rightPanel {
      right: 18px;
      width: 360px;
      padding: 16px;
    }

    .panelTitle {
      color: #ffe77a;
      font-size: 22px;
      font-weight: bold;
      margin-bottom: 12px;
    }

    .section {
      margin-bottom: 14px;
      padding: 14px;
      border-radius: 18px;
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.08);
    }

    .sectionTitle {
      color: #ffe77a;
      font-size: 18px;
      font-weight: bold;
      margin-bottom: 10px;
    }

    .controlRow {
      display: grid;
      grid-template-columns: 1fr 110px 58px;
      align-items: center;
      gap: 10px;
      margin-bottom: 12px;
    }

    .controlRow label {
      font-size: 14px;
      font-weight: bold;
      color: #ffffff;
    }

    .valueBox, select {
      width: 100%;
      height: 38px;
      box-sizing: border-box;
      padding: 6px 10px;
      border-radius: 10px;
      border: 1px solid rgba(255,255,255,0.14);
      background: rgba(255,255,255,0.10);
      color: #fff;
      font-size: 14px;
      outline: none;
    }

    select option {
      color: #111;
      background: #fff;
    }

    input[type="range"] {
      width: 100%;
      appearance: none;
      -webkit-appearance: none;
      height: 8px;
      border-radius: 999px;
      background: linear-gradient(90deg, #46c6ff, #00e0ff);
      outline: none;
      margin: 0;
    }

    input[type="range"]::-webkit-slider-thumb {
      -webkit-appearance: none;
      appearance: none;
      width: 18px;
      height: 18px;
      border-radius: 50%;
      background: #fff;
      border: 2px solid #0c84ff;
      cursor: pointer;
    }

    input[type="range"]::-moz-range-thumb {
      width: 18px;
      height: 18px;
      border-radius: 50%;
      background: #fff;
      border: 2px solid #0c84ff;
      cursor: pointer;
    }

    .btnRow {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    button {
      border: none;
      cursor: pointer;
      border-radius: 12px;
      padding: 10px 14px;
      font-size: 14px;
      font-family: inherit;
      font-weight: bold;
      color: white;
      box-shadow: 0 6px 16px rgba(0,0,0,0.22);
      transition: transform 0.15s ease, filter 0.15s ease;
    }

    button:hover {
      transform: translateY(-1px);
      filter: brightness(1.05);
    }

    .btnPrimary { background: #17457d; }
    .btnGreen   { background: #1d6e4f; }
    .btnOrange  { background: #86551b; }
    .btnRed     { background: #8a2e2e; }

    .readout {
      padding: 12px;
      border-radius: 14px;
      background: rgba(255,255,255,0.06);
      color: #eef6ff;
      font-size: 14px;
      line-height: 1.5;
      margin-top: 10px;
    }

    .smallNote {
      font-size: 12px;
      color: #d4e3ff;
      margin-top: 6px;
    }

    #plotCanvas {
      width: 100%;
      height: 280px;
      background: #05080d;
      border: 1px solid rgba(255,255,255,0.12);
      border-radius: 16px;
      display: block;
    }

    #bottomHint {
      position: absolute;
      left: 50%;
      bottom: 10px;
      transform: translateX(-50%);
      z-index: 20;
      padding: 8px 14px;
      border-radius: 12px;
      background: rgba(0,0,0,0.38);
      border: 1px solid rgba(255,255,255,0.12);
      font-size: 12px;
      color: #d8e6ff;
      text-align: center;
    }

    @media (max-width: 1200px) {
      #rightPanel {
        width: 320px;
      }
    }

    @media (max-width: 980px) {
      #rightPanel {
        display: none;
      }
    }