/* ── 素材库浮层（IMS v2：点按钮弹窗展示） ─────────────── */
    .ims-library {
      background: var(--panel);
      border: 1px solid var(--border);
      border-radius: 14px;
      padding: 14px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      position: sticky;
      top: 12px;
      max-height: calc(100vh - 40px);
      min-height: 300px;
    }
    /* 改成浮层 modal：居中、遮罩、关闭按钮 */
    .ims-library.ims-library-modal {
      position: fixed;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      width: min(920px, calc(100vw - 40px));
      height: min(720px, calc(100vh - 80px));
      max-height: none;
      z-index: 130;
      box-shadow: 0 24px 64px rgba(0, 0, 0, 0.28);
      padding: 18px 20px 20px;
    }
    .ims-library.ims-library-modal::before {
      content: "";
      position: fixed;
      inset: 0;
      background: rgba(0, 0, 0, 0.45);
      z-index: -1;
      pointer-events: none;
    }
    .ims-library-close {
      position: absolute;
      top: 10px;
      right: 10px;
      padding: 4px 11px;
      font-size: 18px;
      line-height: 1;
      z-index: 2;
    }
    .ims-library-head {
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .ims-library-head h3 {
      margin: 0;
      font-size: var(--fs-15);
    }
    .ims-library-head .ims-card-sub { margin-left: 0; }
    .ims-library-refresh {
      margin-left: auto;
      padding: 4px 10px;
      font-size: var(--fs-13);
    }
    .ims-library-tabs {
      display: flex;
      gap: 4px;
      flex-wrap: wrap;
    }
    .ims-library-tab {
      padding: 4px 10px;
      border-radius: 999px;
      background: var(--bg-soft);
      border: 1px solid var(--border);
      color: var(--fg-dim);
      font-size: var(--fs-12);
      cursor: pointer;
      transition: all 0.15s;
    }
    .ims-library-tab:hover { color: var(--fg); }
    .ims-library-tab.active {
      background: color-mix(in srgb, var(--accent, var(--brand-deep)) 15%, var(--panel));
      border-color: var(--accent, var(--brand-deep));
      color: var(--fg);
    }
    .ims-library-hint {
      font-size: var(--fs-12);
      color: var(--fg-muted);
      line-height: 1.5;
    }
    .ims-library-list {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 8px;
      overflow-y: auto;
      flex: 1;
      padding-right: 2px;
    }
    .ims-library-list .skills-empty {
      padding: 20px 8px;
      text-align: center;
      color: var(--fg-muted);
      font-size: var(--fs-13);
      grid-column: 1 / -1;
    }
    @media (max-width: 1280px) {
      .ims-library-list { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    }
    @media (max-width: 1100px) {
      .ims-library-list { grid-template-columns: repeat(auto-fill, minmax(110px, 1fr)); }
    }
    .ims-media-card {
      display: flex;
      flex-direction: column;
      gap: 4px;
      padding: 5px;
      background: var(--bg-soft);
      border: 1px solid var(--border);
      border-radius: 8px;
      transition: border-color 0.15s;
      min-width: 0;
    }
    .ims-media-card:hover { border-color: var(--accent, var(--brand-deep)); }
    .ims-media-thumb {
      width: 100%;
      aspect-ratio: 1 / 1;
      background: #000;
      border-radius: 5px;
      overflow: hidden;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--fg-muted);
      font-size: var(--fs-10);
    }
    .ims-media-thumb img,
    .ims-media-thumb video {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }
    .ims-media-thumb .ims-media-kind-tag {
      position: absolute;
      left: 3px;
      top: 3px;
      padding: 0 4px;
      font-size: var(--fs-10);
      background: rgba(0,0,0,0.6);
      color: #fff;
      border-radius: 3px;
      letter-spacing: 0.3px;
      line-height: 1.5;
    }
    .ims-media-thumb .ims-media-audio-icon {
      font-size: var(--fs-22);
    }
    .ims-media-name {
      font-size: var(--fs-11);
      color: var(--fg);
      word-break: break-all;
      line-height: 1.3;
      max-height: 2.6em;
      overflow: hidden;
      display: -webkit-box;
      -webkit-line-clamp: 2;
      -webkit-box-orient: vertical;
    }
    .ims-media-meta {
      font-size: var(--fs-10);
      color: var(--fg-muted);
      display: flex;
      gap: 4px;
      flex-wrap: wrap;
      line-height: 1.3;
    }
    .ims-media-actions {
      display: flex;
      gap: 4px;
    }
    .ims-media-btn {
      flex: 1;
      padding: 3px 2px;
      border-radius: 5px;
      background: var(--panel);
      border: 1px solid var(--border);
      color: var(--fg-muted);
      font-size: var(--fs-11);
      line-height: 1.4;
      cursor: pointer;
      transition: all 0.15s;
      min-width: 0;
      text-align: center;
      white-space: nowrap;
      overflow: hidden;
    }
    .ims-media-btn:hover {
      color: var(--fg);
      border-color: var(--accent, var(--brand-deep));
    }
    .ims-media-btn.danger:hover {
      color: #ef4444;
      border-color: #ef4444;
    }

    /* 素材选择弹窗 */
    .ims-picker-overlay {
      position: fixed;
      inset: 0;
      background: rgba(0, 0, 0, 0.45);
      z-index: 120;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 20px;
    }
    .ims-picker-modal {
      background: var(--panel);
      border: 1px solid var(--border);
      border-radius: 14px;
      width: min(880px, 100%);
      max-height: 88vh;
      display: flex;
      flex-direction: column;
      overflow: hidden;
      box-shadow: 0 24px 64px rgba(0,0,0,0.28);
    }
    .ims-picker-head {
      display: flex;
      align-items: center;
      gap: 10px;
      padding: 14px 18px;
      border-bottom: 1px solid var(--border);
    }
    .ims-picker-head h3 { margin: 0; font-size: var(--fs-15); }
    .ims-picker-sub {
      color: var(--fg-muted);
      font-size: var(--fs-12);
      flex: 1;
    }
    .ims-picker-close {
      padding: 2px 10px;
      font-size: var(--fs-18);
      line-height: 1;
    }
    .ims-picker-modal .ims-library-tabs {
      padding: 10px 18px 0;
    }
    .ims-picker-body {
      padding: 12px 18px;
      overflow-y: auto;
      flex: 1;
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
      gap: 10px;
      min-height: 240px;
    }
    .ims-picker-body .skills-empty { grid-column: 1 / -1; }
    .ims-picker-card {
      position: relative;
      background: var(--bg-soft);
      border: 2px solid var(--border);
      border-radius: 10px;
      padding: 6px;
      cursor: pointer;
      display: flex;
      flex-direction: column;
      gap: 6px;
      transition: all 0.15s;
    }
    .ims-picker-card:hover { border-color: var(--accent, var(--brand-deep)); }
    .ims-picker-card.selected {
      border-color: var(--brand-deep);
      box-shadow: 0 0 0 2px rgba(0,0,0,0.06);
    }
    .ims-picker-card.selected::before {
      content: "✓";
      position: absolute;
      top: 8px;
      right: 8px;
      width: 22px;
      height: 22px;
      border-radius: 50%;
      background: var(--brand-deep);
      color: #fff;
      font-size: var(--fs-13);
      display: flex;
      align-items: center;
      justify-content: center;
      z-index: 2;
    }
    .ims-picker-card .ims-media-thumb {
      aspect-ratio: 1 / 1;
    }
    .ims-picker-card .ims-media-name {
      font-size: var(--fs-12);
      -webkit-line-clamp: 2;
    }
    .ims-picker-foot {
      display: flex;
      align-items: center;
      gap: 10px;
      padding: 12px 18px;
      border-top: 1px solid var(--border);
      background: var(--bg-soft);
    }
    .ims-picker-count {
      color: var(--fg);
      font-size: var(--fs-13);
      font-weight: 500;
    }
    .ims-picker-spacer { flex: 1; }

    .skills-toolbar {
      display: flex;
      gap: 10px;
      margin-bottom: 18px;
      flex-wrap: wrap;
    }
    .skills-search-big {
      flex: 1;
      min-width: 220px;
      padding: 10px 14px;
      background: var(--panel);
      border: 1px solid var(--border);
      border-radius: 12px;
      font-size: var(--fs-14);
      color: var(--fg);
      outline: none;
      transition: border-color 0.15s, box-shadow 0.15s;
    }
    .skills-search-big:focus {
      border-color: var(--brand-deep);
      box-shadow: 0 0 0 3px rgba(0,0,0,0.12);
    }
    .skills-search-big::placeholder { color: var(--muted); }

    .cat-filter {
      display: flex;
      gap: 6px;
      flex-wrap: wrap;
      margin-bottom: 18px;
    }
    .cat-chip {
      padding: 6px 13px;
      background: var(--panel);
      border: 1px solid var(--border);
      border-radius: var(--radius-pill);
      font-size: var(--fs-13);
      color: var(--fg-dim);
      cursor: pointer;
      transition: all 0.12s;
      user-select: none;
    }
    .cat-chip:hover { color: var(--fg); border-color: var(--brand); }
    .cat-chip.active {
      background: var(--grad-card);
      color: #fff;
      border-color: transparent;
      font-weight: 600;
    }

    .skills-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
      gap: 14px;
    }
    .skill-card {
      background: var(--panel);
      border: 1px solid var(--border);
      border-radius: 14px;
      padding: 16px;
      display: flex;
      flex-direction: column;
      gap: 8px;
      transition: transform 0.15s, box-shadow 0.15s, border-color 0.15s;
      cursor: default;
    }
    .skill-card:hover {
      transform: translateY(-2px);
      box-shadow: 0 10px 24px rgba(0,0,0,0.08);
      border-color: var(--brand);
    }
    .skill-card .sc-title {
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 6px 8px;
      font-size: var(--fs-15);
      font-weight: 600;
      color: var(--fg);
    }
    .skill-card .sc-title::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--fg);
      box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.08);
      flex-shrink: 0;
    }
    [data-theme="dark"] .skill-card .sc-title::before {
      box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.12);
    }
    .skill-card .sc-cat {
      font-size: var(--fs-11);
      font-family: ui-monospace, monospace;
      color: var(--muted);
      background: var(--bg-soft);
      padding: 2px 7px;
      border-radius: 6px;
      margin-left: auto;
    }
    .skill-card .sc-desc {
      font-size: var(--fs-13);
      color: var(--fg-dim);
      line-height: 1.55;
      flex: 1;
    }
    .skill-card .sc-tags {
      display: flex;
      gap: 5px;
      flex-wrap: wrap;
      margin-top: 2px;
    }
    .skill-card .sc-tag {
      font-size: var(--fs-11);
      color: var(--brand-deep);
      background: var(--accent-soft);
      padding: 2px 7px;
      border-radius: 5px;
    }
    .skill-card .sc-version {
      font-size: var(--fs-11);
      color: var(--muted);
      margin-left: auto;
    }
    .skill-card .sc-foot {
      display: flex;
      align-items: center;
      gap: 6px;
      margin-top: 4px;
    }

    .skills-empty {
      padding: 40px 20px;
      text-align: center;
      color: var(--muted);
      font-size: var(--fs-14);
    }