/* ===== カラー変数 ===== */
      :root {
        --cream: #FCF9E8;
        --brown: #3C321D;
        --green: #007E43;
        --green-light: #E8F5EE;
        --green-hover: #005f32;
        --gray: #6C6C6C;
        --shadow: rgba(60, 50, 29, 0.15);
      }

      /* ===== ベース ===== */
      html, body {
        background-color: var(--cream);
        font-family: 'Zen Maru Gothic', 'Noto Sans JP', sans-serif;
        align-items: flex-start; /* position:absolute の基準を左上に固定 */
      }

      /* ===== 固定ボタン共通 ===== */
      #backToTop,
      #helpIcon,
      #shareX {
        position: fixed;
        top: 18px;
        width: 44px;
        height: 44px;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        box-shadow: 0 2px 8px var(--shadow);
        transition: transform 0.18s ease, box-shadow 0.18s ease;
        z-index: 10001;
        text-decoration: none;
      }

      #backToTop:hover,
      #helpIcon:hover,
      #shareX:hover {
        transform: scale(1.08);
        box-shadow: 0 4px 14px var(--shadow);
      }

      /* トップへ戻るボタン */
      #backToTop {
        left: 18px;
        background-color: #fff;
        border: 2px solid var(--green);
        color: var(--green);
      }

      #backToTop svg {
        width: 20px;
        height: 20px;
        display: block;
      }

      /* ヘルプアイコン */
      #helpIcon {
        left: 74px;
        background-color: var(--green);
        color: #fff;
        font-size: 20px;
        font-weight: 700;
        line-height: 1;
        cursor: pointer;
        /* override styles.css fixed values */
        width: 44px !important;
        height: 44px !important;
        top: 18px !important;
        left: 74px !important;
        background-color: var(--green) !important;
      }

      #helpIcon:hover {
        background-color: var(--green-hover) !important;
        transform: scale(1.08) !important;
      }

      /* Xシェアボタン */
      #shareX {
        left: 130px;
        background-color: var(--brown);
        border: none;
      }

      #shareX img {
        width: 20px;
        height: auto;
        filter: brightness(0) invert(1);
        pointer-events: none;
      }

      /* ===== ヘルプポップアップ ===== */
      #helpPopup {
        background-color: rgba(60, 50, 29, 0.45) !important;
      }

      #helpContent {
        background: var(--cream) !important;
        border-radius: 24px !important;
        padding: 52px 48px 44px !important;
        max-width: 600px !important;
        width: 90%;
        position: relative;
        box-shadow: 0 8px 32px rgba(60,50,29,0.18);
        max-height: 85vh;
        overflow-y: auto;
      }

      #howToTitle {
        font-family: 'Zen Maru Gothic', sans-serif;
        font-weight: 700;
        font-size: 22px;
        color: var(--brown);
        text-align: center;
        margin: 0 0 28px;
        padding-bottom: 16px;
        border-bottom: 1.5px dashed #c8c0a8;
      }

      #closePopup {
        position: absolute;
        top: 20px;
        right: 24px;
        background: #fff;
        border: none;
        width: 32px;
        height: 32px;
        border-radius: 50%;
        font-size: 18px;
        line-height: 1;
        cursor: pointer;
        color: var(--brown);
        display: flex;
        align-items: center;
        justify-content: center;
        transition: background 0.2s;
      }

      #closePopup:hover { background: #eee; }

      .howto-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 0 24px;
      }
      .howto-col {
        display: flex;
        flex-direction: column;
        gap: 12px;
      }
      .howto-col + .howto-col {
        border-left: 1px solid rgba(60,50,29,0.08);
        padding-left: 24px;
      }
      .howto-item {
        padding: 14px 0 0;
        display: flex;
        flex-direction: column;
        align-items: center;
        text-align: center;
      }
      .howto-label {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        font-family: 'Zen Maru Gothic', sans-serif;
        font-weight: 700;
        font-size: 13px;
        color: var(--green);
        letter-spacing: 0.06em;
        background: #DFEED1;
        padding: 4px 0;
        border-radius: 20px;
        margin-bottom: 8px;
        width: 100%;
      }
      .howto-label img { width: 16px; height: 16px; }
      .howto-svg-wrap {
        display: flex;
        justify-content: center;
      }
      .howto-svg-wrap svg {
        width: 100%;
        max-width: 150px;
        height: auto;
      }
      .howto-item-text {
        font-family: 'Noto Sans JP', sans-serif;
        font-size: 14px;
        color: var(--brown);
        line-height: 1.8;
        text-align: center;
      }
      .howto-note {
        font-family: 'Noto Sans JP', sans-serif;
        font-size: 12px;
        color: var(--gray);
        text-align: center;
        margin-top: 16px;
        line-height: 1.7;
      }
      .howto-ver {
        font-size: 11px;
        color: #c8c0a8;
        text-align: right;
        margin-top: 12px;
      }

      @media (max-width: 480px) {
        #helpContent {
          padding: 40px 24px 32px !important;
        }
        #howToTitle { font-size: 18px; }
        .howto-grid { grid-template-columns: 1fr; gap: 16px 0; }
        .howto-col + .howto-col {
          border-left: none;
          padding-left: 0;
          border-top: 1px solid rgba(60,50,29,0.08);
          padding-top: 16px;
        }
      }

      /* ===== コメント入力ボックス ===== */
      #commentBox {
        background: var(--cream) !important;
        border: 2px solid var(--green) !important;
        border-radius: 18px !important;
        padding: 24px 22px 20px !important;
        box-shadow: 0 6px 24px var(--shadow) !important;
        width: 360px !important;
        font-family: 'Zen Maru Gothic', sans-serif;
      }

      #closeCommentBox {
        position: absolute;
        top: -14px;
        right: -10px;
        width: 28px;
        height: 28px;
        background: var(--cream);
        border: 2px solid var(--green);
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 18px;
        line-height: 1;
        color: var(--gray);
        cursor: pointer;
        transition: color 0.15s, background 0.15s;
        z-index: 10;
      }

      #closeCommentBox:hover {
        background: var(--green);
        color: #fff;
      }

      #commentInput {
        background: #fff !important;
        border: 1.5px solid #C8E6D6 !important;
        border-radius: 10px !important;
        font-family: 'Zen Maru Gothic', sans-serif;
        color: var(--brown);
        font-size: 0.95rem;
        resize: none;
        padding: 10px 12px !important;
        margin-top: 4px;
        transition: border-color 0.2s;
      }

      #commentInput:focus {
        border-color: var(--green) !important;
        outline: none;
      }

      #commentBox label {
        font-family: 'Zen Maru Gothic', sans-serif;
        font-size: 12px;
        font-weight: 700;
        color: var(--brown);
        letter-spacing: 0.03em;
      }

      #commentBox select {
        background: #fff !important;
        border: 1.5px solid #C8E6D6 !important;
        border-radius: 8px !important;
        font-family: 'Zen Maru Gothic', sans-serif;
        color: var(--brown);
        font-size: 0.9rem;
        padding: 6px 8px !important;
        cursor: pointer;
        transition: border-color 0.2s;
      }

      #commentBox select:focus {
        border-color: var(--green) !important;
        outline: none;
      }

      #fontPreview {
        background: #fff;
        border: 1.5px solid #C8E6D6;
        border-radius: 8px;
        padding: 6px 10px;
        font-size: 0.88rem;
        color: var(--brown);
        margin: 6px 0 0;
      }

      #sendButton {
        background-color: var(--green) !important;
        color: #fff !important;
        border: none !important;
        border-radius: 50px !important;
        padding: 10px 36px !important;
        font-family: 'Zen Maru Gothic', sans-serif;
        font-size: 0.95rem;
        font-weight: 700;
        letter-spacing: 0.08em;
        cursor: pointer;
        margin-top: 14px;
        transition: background-color 0.2s, transform 0.12s;
        display: block;
        margin-left: auto;
        margin-right: auto;
      }

      #sendButton:hover {
        background-color: var(--green-hover) !important;
      }

      #sendButton:active {
        transform: scale(0.96);
      }

      #errorMessage {
        font-family: 'Zen Maru Gothic', sans-serif;
        font-size: 0.82rem;
      }

      .terms-notice {
        font-family: 'Zen Maru Gothic', sans-serif;
        font-size: 0.75rem;
        color: var(--gray);
        text-align: center;
        margin: 12px 0 0;
      }

      .terms-notice a {
        color: var(--green);
        text-decoration: underline;
      }

      .terms-notice a:hover {
        color: var(--green-hover);
      }

      /* ===== 右クリックメニュー ===== */
      #contextMenu {
        border-radius: 12px !important;
        overflow: hidden;
        box-shadow: 0 4px 16px var(--shadow) !important;
      }

      #contextMenu button {
        display: block !important;
        width: 100% !important;
        box-sizing: border-box !important;
        background-color: #C0392B !important;
        color: #fff !important;
        border: none !important;
        padding: 13px 22px !important;
        border-radius: 0 !important;
        font-family: 'Zen Maru Gothic', sans-serif;
        font-size: 14px !important;
        font-weight: 700;
        cursor: pointer;
        letter-spacing: 0.04em;
        transition: background-color 0.18s;
      }

      #contextMenu button:hover {
        background-color: #96281B !important;
      }

      #contextMenu button:disabled {
        background-color: #96281B !important;
        opacity: 0.55;
        cursor: not-allowed !important;
      }

      #deleteCountInfo {
        background-color: #6E1F18 !important;
        color: rgba(255, 255, 255, 0.88) !important;
        font-family: 'Zen Maru Gothic', sans-serif;
        font-size: 11px !important;
        letter-spacing: 0.04em;
      }

      @media (max-width: 480px) {
        #contextMenu button {
          font-size: 13px !important;
          padding: 11px 18px !important;
        }
        #deleteCountInfo {
          font-size: 10px !important;
          padding: 4px 18px 6px !important;
        }
      }

      /* ===== ズームコントロール ===== */
      #zoomControls {
        position: fixed;
        bottom: 24px;
        right: 16px;
        display: flex;
        flex-direction: column;
        gap: 8px;
        z-index: 10001;
      }

      #zoomControls button {
        width: 42px;
        height: 42px;
        border-radius: 50%;
        border: 2px solid var(--green);
        background-color: var(--cream);
        color: var(--green);
        font-size: 22px;
        font-weight: 700;
        line-height: 1;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        box-shadow: 0 2px 8px var(--shadow);
        transition: background-color 0.18s, color 0.18s, transform 0.12s;
        font-family: 'Zen Maru Gothic', sans-serif;
      }

      #zoomControls button:hover {
        background-color: var(--green);
        color: #fff;
        transform: scale(1.08);
      }

      #zoomControls button:active {
        transform: scale(0.94);
      }

      /* ===== フローティングコメント ===== */
      .comment {
        background-color: rgba(252, 249, 232, 0.94) !important;
        border: 1.5px solid currentColor !important;
        border-radius: 12px !important;
        box-shadow: 0 3px 10px var(--shadow) !important;
        font-family: 'Noto Sans JP', sans-serif;
        font-size: 0.88rem;
      }

      .comment:hover {
        box-shadow: 0 6px 18px var(--shadow) !important;
      }

      .like-count {
        color: var(--gray);
      }

      /* ===== キャンバスエリアの背景装飾 ===== */
      #commentsContainer {
        background-color: var(--cream);
      }

      /* ===== スマホ対応 ===== */
      @media (max-width: 600px) {
        #commentBox {
          width: calc(100vw - 40px) !important;
          border-radius: 14px !important;
          padding: 20px 16px 16px !important;
        }

        #backToTop { top: 14px; left: 12px; }
        #helpIcon  { top: 14px !important; left: 66px !important; }
        #shareX    { left: 120px; top: 14px; }

        #zoomControls {
          bottom: 16px;
          right: 10px;
        }
      }