.preview-shell {
  display: grid;
  gap: 12px;
  min-height: 100%;
}

.preview-summary-bar {
  display: grid;
  gap: 10px;
  padding: 2px 2px 12px;
  border-bottom: 1px solid #e7edf4;
}

.preview-summary-main {
  min-width: 0;
  display: grid;
  gap: 8px;
}

.preview-summary-topline {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.preview-section-label {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: #748396;
  text-transform: uppercase;
}

.preview-file-type {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  min-width: 62px;
  padding: 4px 10px;
  border-radius: 999px;
  background: linear-gradient(180deg, #edf4ff 0%, #e5effd 100%);
  color: #24558f;
  font-size: 12px;
  font-weight: 700;
}

.preview-summary-title {
  margin: 0;
  color: #0f172a;
  font-size: 21px;
  line-height: 1.35;
}

.preview-summary-note {
  margin: 0;
  color: #64748b;
  font-size: 13px;
  line-height: 1.6;
  max-width: 760px;
}

.preview-meta-inline {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  color: #5f7085;
  font-size: 12px;
}

.preview-meta-inline span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  border-radius: 999px;
  background: #f6f9fc;
  border: 1px solid #e6edf5;
}

.preview-tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.preview-tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 999px;
  background: #f3f6fa;
  color: #607186;
  font-size: 12px;
  font-weight: 600;
}

.preview-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  padding: 10px 14px;
  border-radius: 16px;
  background: linear-gradient(180deg, #f9fbfd 0%, #f3f7fb 100%);
  border: 1px solid #e7edf4;
}

.preview-toolbar-compact {
  justify-content: flex-end;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
}

.preview-toolbar-copy {
  display: grid;
  gap: 4px;
}

.preview-toolbar-title {
  color: #1e293b;
  font-size: 13px;
  font-weight: 700;
}

.preview-toolbar-note {
  color: #748396;
  font-size: 12px;
}

.preview-mode-group {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px;
  border-radius: 999px;
  background: #e9f0f7;
}

.preview-mode-btn {
  border: 0;
  background: transparent;
  color: #607186;
  border-radius: 999px;
  padding: 7px 12px;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  transition: color 0.16s ease;
}

.preview-mode-btn:hover {
  color: #1e293b;
}

.preview-mode-btn.active {
  background: #ffffff;
  color: #1d4e80;
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.08);
}

.preview-stage {
  min-width: 0;
  min-height: 0;
  position: relative;
}

.preview-stage-scroll {
  overflow: auto;
  min-height: 560px;
  height: 100%;
  padding: 18px;
  border-radius: 22px;
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.85) 0%, rgba(255, 255, 255, 0) 30%),
    linear-gradient(180deg, #f3f7fb 0%, #ecf2f8 100%);
  border: 1px solid #e2eaf2;
}

.preview-paper {
  max-width: 980px;
  margin: 0 auto;
}

.preview-paper.has-paper-toolbar {
  position: relative;
}

.preview-paper-toolbar {
  position: sticky;
  top: 6px;
  z-index: 4;
  display: flex;
  justify-content: flex-end;
  margin: 0 0 14px;
  pointer-events: none;
}

.preview-paper-toolbar .preview-toolbar {
  pointer-events: auto;
}

.preview-paper-toolbar .preview-mode-group {
  padding: 5px;
  background: rgba(233, 240, 247, 0.92);
  border: 1px solid rgba(223, 232, 242, 0.96);
  box-shadow: 0 10px 22px rgba(15, 23, 42, 0.10);
  backdrop-filter: blur(10px);
}

.preview-shell[data-preview-mode="focus"] .preview-paper {
  max-width: 760px;
}

.preview-shell[data-preview-mode="wide"] .preview-paper {
  max-width: 1260px;
}

.preview-frame-wrap {
  min-height: 560px;
  background: #ffffff;
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid #e3e9f2;
  box-shadow: 0 18px 34px rgba(15, 23, 42, 0.08);
}

.preview-stage-scroll.frame-scroll {
  padding: 10px;
}

.resource-preview-frame {
  width: 100%;
  height: 78vh;
  min-height: 560px;
  border: 0;
  background: #ffffff;
}

.preview-doc-shell .docx-container,
.preview-fullscreen .res-docx,
.docx-container {
  max-width: none;
  margin: 0 auto;
  background: linear-gradient(180deg, #fffefc 0%, #fffdfa 100%);
  border: 1px solid #ebe4db;
  border-radius: 22px;
  padding: 42px 52px;
  box-shadow:
    0 22px 42px rgba(15, 23, 42, 0.10),
    0 2px 10px rgba(148, 163, 184, 0.06);
}

.structured-doc-shell {
  display: grid;
  gap: 12px;
}

.docx-reading-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
  color: #6b7d90;
  font-size: 12px;
}

.docx-reading-meta span {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid #e7edf4;
}

.docx-container-structured {
  padding-top: 34px;
  padding-bottom: 34px;
}

.docx-article {
  display: grid;
  gap: 20px;
  color: #223548;
}

.docx-article-empty {
  color: #6b7d90;
  font-size: 15px;
  line-height: 1.7;
}

.docx-block {
  min-width: 0;
}

.docx-block-heading h1,
.docx-block-heading h2,
.docx-block-heading h3,
.docx-block-heading h4 {
  margin: 0;
  color: #16324f;
  letter-spacing: -0.02em;
}

.docx-block-heading.level-1 h1 {
  font-size: 34px;
  line-height: 1.2;
}

.docx-block-heading.level-2 h2 {
  font-size: 26px;
  line-height: 1.28;
}

.docx-block-heading.level-3 h3 {
  font-size: 21px;
  line-height: 1.35;
}

.docx-block-heading.level-4 h4 {
  font-size: 18px;
  line-height: 1.4;
}

.docx-block-paragraph p {
  margin: 0;
  font-size: 18px;
  line-height: 1.95;
  color: #2c4056;
  white-space: pre-wrap;
}

.docx-block-list ul {
  margin: 0;
  padding-left: 1.4em;
  display: grid;
  gap: 10px;
}

.docx-block-list li {
  font-size: 17px;
  line-height: 1.85;
  color: #2c4056;
}

.docx-table-wrap {
  overflow: auto;
  border: 1px solid #e6ecf3;
  border-radius: 16px;
  background: #fcfdff;
}

.docx-table-wrap table {
  width: 100%;
  border-collapse: collapse;
}

.docx-table-wrap td {
  padding: 12px 14px;
  border-right: 1px solid #e6ecf3;
  border-bottom: 1px solid #e6ecf3;
  font-size: 15px;
  line-height: 1.7;
  color: #33485e;
  vertical-align: top;
}

.docx-table-wrap tr:last-child td {
  border-bottom: 0;
}

.docx-table-wrap td:last-child {
  border-right: 0;
}

.preview-stage-scroll.slide-scroll .pptx-preview {
  gap: 16px;
}

.preview-stage-scroll.slide-scroll .pptx-slide {
  background: #ffffff;
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid #e3e9f2;
  box-shadow: 0 18px 34px rgba(15, 23, 42, 0.08);
}

.preview-stage-scroll.slide-scroll .pptx-slide-head {
  padding: 11px 15px;
  background: #f5f7fa;
  border-bottom: 1px solid #edf2f6;
}

.preview-stage-scroll.slide-scroll .pptx-slide-body {
  padding: 18px;
  gap: 10px;
  line-height: 1.75;
}

.preview-loading,
.preview-empty,
.preview-unsupported {
  min-height: 560px;
  display: grid;
  place-items: center;
}

.preview-loading-card,
.preview-empty-card,
.preview-unsupported-card {
  width: min(100%, 460px);
  background: #ffffff;
  border-radius: 16px;
  padding: 26px 22px;
  text-align: center;
}

.preview-loading-card {
  display: grid;
  gap: 14px;
}

.preview-loading-spinner {
  width: 32px;
  height: 32px;
  margin: 0 auto;
  border-radius: 50%;
  border: 3px solid #d8e4f3;
  border-top-color: #3e6b9d;
  animation: previewSpin 1s linear infinite;
}

.preview-loading-title,
.preview-empty-title,
.preview-unsupported-title {
  margin: 0;
  color: #1e293b;
  font-size: 18px;
  font-weight: 700;
}

.preview-loading-text,
.preview-empty-text,
.preview-unsupported-text {
  margin: 0;
  color: #64748b;
  font-size: 14px;
  line-height: 1.7;
}

.preview-unsupported-actions {
  margin-top: 16px;
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

@keyframes previewSpin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@media (max-width: 900px) {
  .preview-summary-bar {
    display: grid;
    gap: 12px;
  }

  .preview-summary-title {
    font-size: 18px;
  }
}

@media (max-width: 760px) {
  .preview-summary-bar {
    padding: 2px 0 10px;
  }

  .preview-stage-scroll {
    min-height: 420px;
    padding: 12px;
    border-radius: 18px;
  }

  .resource-preview-frame {
    min-height: 420px;
    height: 68vh;
  }

  .preview-frame-wrap,
  .preview-doc-shell .docx-container,
  .preview-fullscreen .res-docx,
  .docx-container,
  .preview-stage-scroll.slide-scroll .pptx-slide,
  .preview-loading-card,
  .preview-empty-card,
  .preview-unsupported-card {
    border-radius: 14px;
  }

  .preview-doc-shell .docx-container,
  .preview-fullscreen .res-docx,
  .docx-container {
    padding: 24px 18px;
  }

  .preview-paper-toolbar {
    top: 0;
    margin-bottom: 12px;
  }

  .preview-paper-toolbar .preview-mode-group {
    width: 100%;
    justify-content: space-between;
  }

  .preview-paper-toolbar .preview-mode-btn {
    flex: 1 1 0;
    text-align: center;
  }

  .docx-block-heading.level-1 h1 {
    font-size: 28px;
  }

  .docx-block-heading.level-2 h2 {
    font-size: 23px;
  }

  .docx-block-paragraph p,
  .docx-block-list li {
    font-size: 16px;
    line-height: 1.85;
  }

  .preview-loading,
  .preview-empty,
  .preview-unsupported,
  .preview-frame-wrap {
    min-height: 420px;
  }
}