/* About dialog + changelog */
  .about-dialog {
    width: min(560px, 92vw);
    border: 1px solid var(--hairline);
    border-radius: var(--radius-card);
    padding: 26px 26px 22px;
    background: var(--paper);
    color: var(--ink);
    box-shadow: 0 24px 60px rgba(48, 51, 54, 0.22), var(--shadow-sm);
    position: relative;
  }
  .about-dialog::backdrop {
    background: rgba(48, 51, 54, 0.32);
    backdrop-filter: blur(2px);
  }
  .about-dialog h2 { margin: 0 0 6px; font-size: var(--text-heading-sm); font-weight: 700; color: var(--ink); }
  .about-dialog h3 { margin: 18px 0 8px; font-size: var(--text-caption); color: var(--fog); text-transform: uppercase; letter-spacing: 0.4px; }
  .about-version { color: var(--signal-blue); font-size: 15px; font-weight: 700; }
  .about-desc { margin: 0 0 10px; color: var(--ink); font-size: var(--text-body); line-height: 1.6; }
  .about-how { margin: 0 0 14px; color: var(--fog); font-size: 13px; line-height: 1.6; }
  .about-how code, .about-desc code {
    background: var(--mist);
    border: 1px solid var(--hairline);
    border-radius: var(--radius-icon);
    padding: 1px 5px;
    font-size: 12px;
  }
  .about-links { display: flex; flex-wrap: wrap; gap: 8px 16px; margin-bottom: 6px; }
  .about-links a { font-size: 13px; font-weight: 600; }
  .dialog-close {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    border-radius: var(--radius-control);
    border: 1px solid var(--hairline);
    background: var(--paper);
    color: var(--fog);
    cursor: pointer;
    font-size: 13px;
    line-height: 1;
  }
  .dialog-close:hover { border-color: var(--signal-blue); color: var(--ink); }

  .changelog { max-height: 46vh; overflow: auto; }
  .changelog .release { padding: 6px 0; border-top: 1px solid var(--hairline); }
  .changelog .release:first-child { border-top: none; padding-top: 2px; }
  .changelog .release-head {
    display: flex;
    align-items: baseline;
    gap: 10px;
    padding: 4px 0;
    cursor: pointer;
    list-style: none;            /* hide default marker (Firefox) */
    user-select: none;
  }
  .changelog .release-head::-webkit-details-marker { display: none; } /* hide default (Safari/Chrome) */
  /* chevron that rotates when the section is open */
  .changelog .release-head::before {
    content: "›";
    color: var(--fog);
    font-weight: 700;
    width: 10px;
    display: inline-block;
    transition: transform 0.15s ease;
  }
  .changelog .release[open] > .release-head::before { transform: rotate(90deg); }
  .changelog .release-head:hover .release-ver { color: var(--signal-blue-deep); }
  .changelog .release-ver { font-weight: 700; color: var(--signal-blue); font-size: 14px; }
  .changelog .release-date { color: var(--fog); font-size: 12px; }
  .changelog ul { margin: 2px 0 8px; padding-left: 26px; }
  .changelog li { font-size: 13px; margin: 3px 0; color: var(--smoke); line-height: 1.5; }
  .about-credit { margin: 16px 0 0; color: var(--fog); font-size: 12px; text-align: center; }

  /* ----- in-app confirm dialog ----- */
  .confirm-dialog {
    border: 1px solid var(--hairline);
    border-radius: var(--radius-card);
    padding: 0;
    background: var(--paper);
    color: var(--ink);
    box-shadow: 0 24px 60px rgba(48, 51, 54, 0.22), var(--shadow-sm);
    width: min(420px, 92vw);
  }
  .confirm-dialog::backdrop {
    background: rgba(48, 51, 54, 0.32);
    backdrop-filter: blur(2px);
  }
  .confirm-box { padding: 22px 22px 18px; }
  .confirm-msg {
    margin: 0 0 18px;
    font-size: var(--text-body);
    line-height: 1.5;
    color: var(--ink);
  }
  .confirm-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
  }
  .confirm-actions .confirm-ok.danger {
    background: var(--false);
    border-color: var(--false);
  }
  .confirm-actions .confirm-ok.danger:hover { filter: brightness(0.95); }

  /* ----- toast ----- */
  .toast {
    position: fixed;
    left: 50%;
    bottom: 28px;
    transform: translate(-50%, 12px);
    background: var(--ink);
    color: #fff;
    font-size: var(--text-caption);
    padding: 10px 16px;
    border-radius: var(--radius-pill);
    box-shadow: var(--shadow-sm);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.18s, transform 0.18s;
    z-index: 1000;
    max-width: 90vw;
  }
  .toast.show { opacity: 1; transform: translate(-50%, 0); }

  /* ----- "/" slash command menu ----- */
  .slash-menu {
    position: absolute;
    z-index: 1100;
    background: var(--paper);
    border: 1px solid var(--hairline);
    border-radius: var(--radius-control);
    box-shadow: var(--shadow-sm);
    padding: 4px;
    display: none;
    min-width: 160px;
    max-height: 260px;
    overflow: auto;
  }
  .slash-menu.show { display: block; }
  .slash-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 8px;
    border-radius: var(--radius-icon);
    cursor: pointer;
    white-space: nowrap;
  }
  .slash-item .slash-sym {
    width: 20px;
    text-align: center;
    font-size: 15px;
    font-weight: 700;
    color: var(--ink);
  }
  .slash-item .slash-name { font-size: 13px; color: var(--ash); }
  .slash-item.active { background: rgba(37, 118, 235, 0.10); }
  .slash-item.active .slash-name { color: var(--signal-blue); }
  .slash-item:hover { background: var(--mist); }