html, body {
      height: 100%;
      margin: 0;
    }

    body {
      font-family: "Zen Kaku Gothic New", "Noto Sans JP", sans-serif;
    }

    p {
      margin: 0 0 8px;
    }

    .input-note {
      margin: 0 0 2px;
      font-size: 0.9em;
      color: #555;
    }

    h2,
    h3 {
      line-height: 1.2;
      margin-top: 0;
    }

    .hero {
      position: relative;
      padding: 18px 20px 16px;
      border-radius: 14px;
      background:
        radial-gradient(circle at 20% 20%, rgba(255, 188, 87, 0.35), transparent 55%),
        radial-gradient(circle at 80% 20%, rgba(82, 148, 255, 0.35), transparent 60%),
        linear-gradient(135deg, #fff6e9 0%, #f4f7ff 45%, #eef9f3 100%);
      box-shadow: 0 12px 30px rgba(17, 24, 39, 0.08);
      border: 1px solid rgba(18, 42, 82, 0.08);
    }

    .hero-title {
      font-family: "Mochiy Pop One", "Zen Kaku Gothic New", sans-serif;
      font-size: 1.6rem;
      margin: 0 0 6px;
      letter-spacing: 0.02em;
      color: #1b2a4a;
    }

    .section-title {
      font-size: 1rem;
      letter-spacing: 0.04em;
      text-transform: uppercase;
      color: #2f3d5f;
      margin: 8px 0 6px;
    }
    
    /* ===== レイアウト全体 ===== */
    .page {
      display: flex;
      flex-direction: column;
      height: 100vh;
      max-width: 1200px;
      margin: 0 auto;
      padding: 20px;
      box-sizing: border-box;
      gap: 8px;
    }

    /* ===== 入力エリア ===== */
    textarea {
      width: 100%;
      flex: 3;               /* 30% */
      resize: vertical;
      box-sizing: border-box;
    }

    /* ===== 結果表示 ===== */
    .results {
      display: flex;
      flex: 4;               /* 40% */
      gap: 12px;
      min-height: 0;
    }

    .results.is-summary-hidden {
      gap: 0;
    }

    .result-panel,
    .summary-panel {
      display: flex;
      flex-direction: column;
      min-height: 0;
      background: #f5f5f5;
      padding: 10px;
      box-sizing: border-box;
      border-radius: 6px;
    }

    .result-panel {
      flex: 1;
    }

    .summary-panel {
      flex: 1;
      max-width: 100%;
      max-height: 1200px;
      overflow: hidden;
      opacity: 1;
      transform: translateY(0);
      transition: opacity 2s ease, transform 2s ease,
        max-width 2s ease, max-height 2s ease, padding 2s ease;
      will-change: opacity, transform, max-width, max-height;
    }

    .summary-panel.is-hidden {
      max-width: 0;
      max-height: 0;
      padding: 0;
      opacity: 0;
      transform: translateY(8px);
      pointer-events: none;
    }

    .panel-title {
      margin: 0 0 8px;
      font-size: 0.95em;
    }

    pre {
      margin: 0;
      white-space: pre-wrap;
      overflow: auto;
      box-sizing: border-box;
    }

    #out {
      flex: 1;
      border: 1px solid #d0d0d0;
      border-radius: 6px;
      margin: 4px 0 0 0;
      padding: 8px;
      background: #fff;
    }

    #summarySearch {
      margin-bottom: 8px;
      font-size: 0.9em;
    }

    #summaryList {
      overflow: auto;
      flex: 1;
    }

    .summary-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 8px;
      padding: 1px 16px;
      border-radius: 4px;
      font-size: 0.96em;
      line-height: 1.3;
    }

    .summary-row:nth-child(odd) {
      background: #ededed;
    }

    .summary-name-wrap {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      min-width: 0;
      flex: 1;
    }

    .summary-name {
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
      min-width: 0;
    }

    .summary-count {
      font-family: "LINE Seed JP", "Zen Kaku Gothic New", sans-serif;
      font-weight: bold;
      min-width: 2.5em;
      text-align: right;
      font-variant-numeric: tabular-nums;
    }

    .summary-link {
      display: inline-flex;
      align-items: center;
      text-decoration: none;
      color: #1a0dab;
    }

    .summary-link:hover {
      text-decoration: underline;
    }

    .summary-link .material-symbols-outlined {
      font-size: 1em;
      line-height: 1;
    }

    @media (max-height: 880px) {
      .page {
        height: auto;
        min-height: 100vh;
        overflow-y: auto;
      }

      .editor,
      .result-panel,
      .summary-panel {
        max-height: 400px;
      }
    }

    @media (max-width: 900px) {
      .results {
        flex-direction: column;
      }
    }

    @media (hover: none) and (pointer: coarse) {
      :root {
        --editor-font-size: 16px;
      }

      .summary-search {
        font-size: 16px;
      }
    }
    
    /* 結果の各行 */
    .user-line {
      cursor: pointer;
      padding: 1px 4px;
      border-radius: 4px;
      font-size: 0.95em;
      line-height: 1.3;
    }

    .user-line:hover {
      background: #e0e0ff;
    }

    .error-line {
      cursor: pointer;
      padding: 1px 4px;
      border-radius: 4px;
      font-size: 0.95em;
      line-height: 1.3;
      color: #b00020;
      background: #ffe8e8;
    }

    .error-line:hover {
      background: #ffd6d6;
    }

    .editor {
      display: flex;
      flex: 4;
      min-height: 0;
    }

    :root {
      --editor-font-size: 14px;
      --editor-line-height: 1.4;
      --editor-padding: 8px;
    }

    #lineNumbers {
      width: 36px;
      padding: var(--editor-padding) 4px;
      box-sizing: border-box;

      font-family: monospace;
      font-size: var(--editor-font-size);
      line-height: var(--editor-line-height);

      background: #f0f0f0;
      color: #666;
      text-align: right;
      user-select: none;
      overflow: hidden;
      border: 1px solid #ced4da;
      border-right: none;
      border-top-left-radius: 0.375rem;
      border-bottom-left-radius: 0.375rem;
    }

    #src {
      flex: 1;
      font-family: monospace;
      font-size: var(--editor-font-size);
      line-height: var(--editor-line-height);
      padding: var(--editor-padding);
      box-sizing: border-box;
      overflow: auto;
      border-top-left-radius: 0;
      border-bottom-left-radius: 0;
    }

    .user-line.active {
      background: #6a6aff;
      color: white;
    }
    /* ===== その他UI ===== */
    button {
      margin-right: 6px;
    }

    .toggle {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 0.9em;
      color: #555;
      margin: 0;
      user-select: none;
    }

    .toggle input {
      margin: 0;
    }

    .toggle-row {
      margin: 6px 0 10px;
      max-height: 60px;
      opacity: 1;
      transform: translateY(0);
      overflow: hidden;
      transition: opacity 0.6s ease, transform 0.6s ease,
        max-height 0.6s ease, margin 0.6s ease;
      will-change: opacity, transform, max-height, margin;
    }

    .toggle-row.is-hidden {
      max-height: 0;
      opacity: 0;
      transform: translateY(6px);
      margin: 0;
      pointer-events: none;
    }

    .cta {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 8px;
      padding: 10px 12px;
      background: #f5f5f5;
      border-radius: 8px;
    }

    .cta button {
      margin-right: 0;
    }

    .cta-text {
      color: #555;
      font-size: 0.95em;
    }

    .copied {
      color: green;
      margin-left: 8px;
      font-size: 0.9em;
    }

    #countNum {
      font-size: 1.1em;
      font-weight: bold;
      background: linear-gradient(
        90deg,
        #ffcc00,
        #ff66cc,
        #66ccff,
        #ffcc00
      );
      background-size: 300% 100%;
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      animation: sparkle 3s linear infinite;
    }
  
    @keyframes sparkle {
      0%   { background-position:   0% 50%; }
      100% { background-position: 300% 50%; }
    }