:root {
  color-scheme: light;
  --bg: #ffffff;
  --panel: #ffffff;
  --ink: #111111;
  --muted: #5d5d5d;
  --line: #d7d7d7;
  --line-strong: #000000;
  --hover: #f5f5f5;
  --radius: 12px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: "IBM Plex Sans", "Noto Sans SC", sans-serif;
}

button,
input,
textarea {
  font: inherit;
  color: inherit;
}

button {
  border: 0;
  background: none;
  padding: 0;
}

.app-shell {
  width: min(1400px, calc(100% - 32px));
  margin: 16px auto 24px;
}

.topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 14px;
}

.eyebrow {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.topbar-title h1 {
  margin: 6px 0 4px;
  font-size: 1.5rem;
  line-height: 1.1;
}

.topbar-title p {
  margin: 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.topbar-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.workspace-grid {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 12px;
}

.sidebar,
.toolbar,
.pane {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.sidebar {
  align-self: start;
  position: sticky;
  top: 12px;
  padding: 14px;
}

.sidebar-section + .sidebar-section {
  margin-top: 16px;
}

.section-title,
.pane-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
  font-size: 0.88rem;
  font-weight: 600;
}

.section-note {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 0.82rem;
}

.command-grid {
  display: grid;
  gap: 8px;
}

.command-card,
.action-button,
.tool-button,
.icon-button,
.pill-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  cursor: pointer;
  transition: background-color 120ms ease;
}

.command-card {
  width: 100%;
  justify-content: flex-start;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  padding: 10px 12px;
}

.command-name {
  font-size: 0.9rem;
  font-weight: 600;
}

.command-desc {
  font-size: 0.8rem;
  color: var(--muted);
}

.stats-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin: 0;
}

.stats-list div {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px;
}

.stats-list dt {
  margin-bottom: 6px;
  font-size: 0.78rem;
  color: var(--muted);
}

.stats-list dd {
  margin: 0;
  font-weight: 600;
}

.view-actions {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.pill-button.is-active {
  border-color: var(--line-strong);
}

.toolbar {
  padding: 10px;
  margin-bottom: 10px;
  display: flex;
  justify-content: space-between;
  gap: 8px;
}

.toolbar-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.danger-button {
  border-color: #b2b2b2;
}

.panes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.pane {
  display: flex;
  flex-direction: column;
  min-height: 72vh;
  padding: 12px;
}

.pane-header {
  color: var(--muted);
}

.editor-pane textarea {
  flex: 1;
  width: 100%;
  border: 0;
  outline: none;
  resize: none;
  background: transparent;
  color: var(--ink);
  line-height: 1.7;
  font-size: 0.95rem;
  font-family: "IBM Plex Mono", "Cascadia Code", Consolas, monospace;
}

.editor-pane textarea::placeholder {
  color: #8a8a8a;
}

.markdown-preview {
  overflow: auto;
  font-size: 0.94rem;
  line-height: 1.72;
}

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

.markdown-preview h1,
.markdown-preview h2,
.markdown-preview h3,
.markdown-preview h4 {
  margin-top: 1.3em;
  margin-bottom: 0.5em;
  line-height: 1.2;
}

.markdown-preview p,
.markdown-preview ul,
.markdown-preview ol,
.markdown-preview blockquote,
.markdown-preview pre,
.markdown-preview table {
  margin: 0 0 0.95em;
}

.markdown-preview ul,
.markdown-preview ol {
  padding-left: 1.2rem;
}

.markdown-preview code {
  font-family: "IBM Plex Mono", "Cascadia Code", Consolas, monospace;
  padding: 0.08em 0.3em;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: #f8f8f8;
}

.markdown-preview pre {
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fafafa;
}

.markdown-preview pre code {
  border: 0;
  background: transparent;
  padding: 0;
}

.markdown-preview blockquote {
  margin-left: 0;
  padding: 8px 12px;
  border-left: 3px solid #000000;
  background: #f8f8f8;
}

.markdown-preview a {
  color: #000000;
  text-decoration: underline;
}

.markdown-preview hr {
  border: 0;
  height: 1px;
  background: var(--line);
}

.markdown-preview table {
  width: 100%;
  border-collapse: collapse;
}

.markdown-preview th,
.markdown-preview td {
  border: 1px solid var(--line);
  padding: 8px 10px;
  text-align: left;
}

.markdown-preview thead {
  background: #f4f4f4;
}

.layout-editor .preview-pane,
.layout-preview .editor-pane {
  display: none;
}

.layout-editor .panes,
.layout-preview .panes {
  grid-template-columns: 1fr;
}

.layout-focus .sidebar,
.layout-focus .toolbar {
  display: none;
}

.layout-focus .workspace-grid,
.layout-focus .panes {
  grid-template-columns: 1fr;
}

.layout-focus .pane {
  min-height: calc(100vh - 72px);
}

.action-button:hover,
.tool-button:hover,
.icon-button:hover,
.pill-button:hover,
.command-card:hover {
  background: var(--hover);
}

.action-button:focus-visible,
.tool-button:focus-visible,
.icon-button:focus-visible,
.pill-button:focus-visible,
.command-card:focus-visible,
.editor-pane textarea:focus-visible {
  outline: 2px solid #000000;
  outline-offset: 1px;
}

@media (max-width: 1140px) {
  .workspace-grid {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }
}

@media (max-width: 860px) {
  .app-shell {
    width: min(100% - 16px, 1400px);
    margin: 8px auto 14px;
  }

  .topbar {
    flex-direction: column;
  }

  .topbar-actions {
    width: 100%;
    justify-content: flex-start;
  }

  .topbar-actions > * {
    flex: 1 1 120px;
  }

  .toolbar {
    flex-direction: column;
  }

  .toolbar-group {
    width: 100%;
  }

  .tool-button {
    flex: 1 1 76px;
  }

  .view-actions {
    grid-template-columns: 1fr;
  }

  .stats-list,
  .panes {
    grid-template-columns: 1fr;
  }

  .pane {
    min-height: 52vh;
  }
}