.markdown-tool-page {
  background:
    linear-gradient(180deg, rgba(236, 246, 255, 0.86), rgba(255, 255, 255, 0) 520px),
    #fff;
}

.markdown-hero {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 68px var(--page-pad) 38px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.36fr);
  gap: 36px;
  align-items: end;
}

.markdown-hero h1 {
  max-width: 920px;
  margin: 0;
  color: var(--ink);
  font-size: clamp(3.2rem, 6vw, 6.8rem);
  line-height: 0.96;
}

.markdown-hero .lead {
  max-width: 800px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 1.18rem;
  line-height: 1.72;
}

.markdown-hero-card {
  min-height: 180px;
  display: grid;
  align-content: center;
  gap: 12px;
  padding: 26px;
  color: var(--ink);
  background:
    linear-gradient(135deg, rgba(23, 111, 223, 0.12), rgba(22, 160, 133, 0.1)),
    #fff;
  border: 1px solid #d8e6f6;
  box-shadow: 0 20px 54px rgba(28, 82, 141, 0.12);
}

.markdown-hero-card strong {
  font-size: 1.3rem;
}

.markdown-hero-card span {
  color: var(--muted);
  line-height: 1.65;
}

.markdown-workbench {
  max-width: none;
  margin: 0;
  padding: 0;
  background: #111827;
  color: #e5edf8;
  border-top: 1px solid rgba(15, 23, 42, 0.12);
}

.markdown-toolbar {
  min-height: 54px;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 8px 18px;
  background: #0f1724;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.markdown-mode-tabs,
.markdown-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.markdown-mode-tabs button,
.markdown-actions button,
.markdown-panel-heading button {
  min-height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 11px;
  color: #dce7f5;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 7px;
  font: inherit;
  font-size: 0.86rem;
  font-weight: 800;
  cursor: pointer;
}

.markdown-mode-tabs button:hover,
.markdown-mode-tabs button.active,
.markdown-actions button:hover,
.markdown-panel-heading button:hover {
  color: #fff;
  background: #243147;
  border-color: #37465f;
}

.markdown-toolbar [data-md-status] {
  margin-left: auto;
  color: #93a4bc;
  font-size: 0.88rem;
  font-weight: 800;
}

.markdown-layout {
  min-height: calc(100vh - 160px);
  display: grid;
  grid-template-columns: minmax(360px, 0.9fr) minmax(420px, 1.1fr) 280px;
  gap: 0;
}

.markdown-editor-panel,
.markdown-preview-panel,
.markdown-side-panel {
  min-width: 0;
  min-height: 0;
  border-right: 1px solid rgba(255, 255, 255, 0.08);
}

.markdown-panel-heading {
  min-height: 68px;
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: center;
  padding: 14px 18px;
  background: #172132;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.markdown-panel-heading p {
  margin: 0 0 4px;
}

.markdown-panel-heading strong {
  color: #f8fbff;
  font-size: 1.02rem;
}

.markdown-option {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #aab8ca;
  font-size: 0.82rem;
  font-weight: 800;
  white-space: nowrap;
}

.markdown-option input {
  width: 16px;
  height: 16px;
  accent-color: #176fdf;
}

.markdown-editor-panel textarea {
  width: 100%;
  height: calc(100vh - 228px);
  min-height: 560px;
  display: block;
  padding: 20px;
  resize: vertical;
  color: #d9e4f2;
  background: #0f1724;
  border: 0;
  outline: 0;
  font: 0.95rem/1.7 ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
}

.markdown-preview-panel {
  background: #e9eef5;
}

.markdown-preview-surface {
  height: calc(100vh - 228px);
  min-height: 560px;
  overflow: auto;
  padding: 42px;
  color: #1f2937;
  background: #fff;
}

.markdown-preview-surface > *:first-child {
  margin-top: 0;
}

.markdown-preview-surface h1,
.markdown-preview-surface h2,
.markdown-preview-surface h3,
.markdown-preview-surface h4 {
  color: #111827;
  line-height: 1.18;
}

.markdown-preview-surface h1 {
  margin: 0 0 22px;
  font-size: 2.4rem;
}

.markdown-preview-surface h2 {
  margin: 34px 0 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid #dfe8f3;
  font-size: 1.72rem;
}

.markdown-preview-surface h3 {
  margin: 28px 0 12px;
  font-size: 1.32rem;
}

.markdown-preview-surface p,
.markdown-preview-surface li {
  color: #374151;
  font-size: 1rem;
  line-height: 1.78;
}

.markdown-preview-surface a {
  color: #176fdf;
  font-weight: 750;
}

.markdown-preview-surface blockquote {
  margin: 22px 0;
  padding: 14px 18px;
  color: #4b5563;
  background: #f5f8fc;
  border-left: 4px solid #176fdf;
}

.markdown-preview-surface code {
  padding: 0.18em 0.36em;
  color: #be123c;
  background: #f8edf1;
  border-radius: 5px;
  font: 0.9em ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
}

.markdown-preview-surface pre {
  overflow: auto;
  margin: 22px 0;
  padding: 16px;
  color: #dbeafe;
  background: #111827;
  border-radius: 8px;
}

.markdown-preview-surface pre code {
  padding: 0;
  color: inherit;
  background: transparent;
}

.markdown-preview-surface table {
  width: 100%;
  margin: 22px 0;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.markdown-preview-surface th,
.markdown-preview-surface td {
  padding: 10px 12px;
  border: 1px solid #dfe8f3;
  text-align: left;
  vertical-align: top;
}

.markdown-preview-surface th {
  color: #111827;
  background: #f5f8fc;
}

.markdown-preview-surface img {
  max-width: 100%;
  height: auto;
  border: 1px solid #dfe8f3;
}

.markdown-side-panel {
  display: grid;
  align-content: start;
  gap: 12px;
  padding: 14px;
  overflow: auto;
  background: #111827;
}

.markdown-stats-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.markdown-stats-grid article,
.markdown-outline-card {
  padding: 13px;
  background: #172132;
  border: 1px solid #27354b;
  border-radius: 8px;
}

.markdown-stats-grid article {
  display: grid;
  gap: 6px;
}

.markdown-stats-grid span,
.markdown-outline-card .eyebrow {
  margin: 0;
  color: #85b7ff;
  font-size: 0.74rem;
  font-weight: 900;
}

.markdown-stats-grid strong {
  color: #f8fbff;
  font-size: 1.24rem;
}

.markdown-outline-card nav,
.markdown-check-list {
  display: grid;
  gap: 7px;
  margin-top: 10px;
}

.markdown-outline-card a,
.markdown-check-list span {
  display: block;
  padding: 8px 9px;
  color: #cbd7e7;
  text-decoration: none;
  background: #0f1724;
  border: 1px solid #26344a;
  border-radius: 7px;
  font-size: 0.84rem;
  line-height: 1.38;
}

.markdown-outline-card a:hover {
  color: #fff;
  border-color: #176fdf;
}

.markdown-outline-card a[data-level="2"] {
  margin-left: 10px;
}

.markdown-outline-card a[data-level="3"],
.markdown-outline-card a[data-level="4"],
.markdown-outline-card a[data-level="5"],
.markdown-outline-card a[data-level="6"] {
  margin-left: 20px;
}

.markdown-check-list span.ok {
  border-color: rgba(22, 160, 133, 0.45);
}

.markdown-check-list span.warn {
  border-color: rgba(242, 201, 76, 0.56);
}

.markdown-layout[data-layout-mode="source"] {
  grid-template-columns: minmax(0, 1fr) 300px;
}

.markdown-layout[data-layout-mode="source"] .markdown-preview-panel {
  display: none;
}

.markdown-layout[data-layout-mode="preview"] {
  grid-template-columns: minmax(0, 1fr) 300px;
}

.markdown-layout[data-layout-mode="preview"] .markdown-editor-panel {
  display: none;
}

.markdown-guide-section {
  background: #fff;
}

.markdown-use-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.markdown-use-grid article {
  min-height: 160px;
  display: grid;
  align-content: start;
  gap: 12px;
  padding: 24px;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: 0 16px 42px rgba(28, 82, 141, 0.07);
}

.markdown-use-grid strong {
  color: var(--ink);
  font-size: 1.14rem;
}

.markdown-use-grid span {
  color: var(--muted);
  line-height: 1.7;
}

@media (max-width: 1120px) {
  .markdown-hero,
  .markdown-layout,
  .markdown-layout[data-layout-mode="source"],
  .markdown-layout[data-layout-mode="preview"] {
    grid-template-columns: 1fr;
  }

  .markdown-layout {
    min-height: auto;
  }

  .markdown-side-panel {
    grid-template-columns: minmax(0, 0.45fr) minmax(0, 0.55fr);
  }

  .markdown-editor-panel textarea,
  .markdown-preview-surface {
    height: auto;
    min-height: 440px;
  }
}

@media (max-width: 760px) {
  .markdown-hero {
    padding-top: 44px;
  }

  .markdown-hero h1 {
    font-size: 3.1rem;
  }

  .markdown-toolbar {
    align-items: stretch;
    flex-direction: column;
  }

  .markdown-mode-tabs,
  .markdown-actions {
    overflow-x: auto;
  }

  .markdown-preview-surface {
    padding: 24px;
  }

  .markdown-side-panel,
  .markdown-use-grid {
    grid-template-columns: 1fr;
  }
}