:root {
  color-scheme: light;
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-alt: #f0f4f8;
  --text: #18212f;
  --muted: #617086;
  --line: #d7dde6;
  --accent: #17706f;
  --accent-strong: #0d5252;
  --accent-soft: #e7f4f0;
  --code-bg: #f7f9fc;
  --code-text: #253044;
  --focus: #c47f16;
  --toc-blue: #1d4ed8;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button {
  font: inherit;
}

.topbar {
  display: flex;
  align-items: center;
  min-height: 72px;
  padding: 14px clamp(16px, 4vw, 36px);
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

h1 {
  margin: 0;
  font-size: clamp(1.2rem, 1.7vw, 1.6rem);
  line-height: 1.1;
  letter-spacing: 0;
}

.live-pill {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 4px 10px;
  border: 1px solid rgba(23, 112, 111, 0.28);
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.82rem;
  font-weight: 700;
}

button {
  min-height: 36px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
}

button:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent-strong);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

button:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--focus) 35%, transparent);
  outline-offset: 2px;
}

.primary-action {
  padding: 0 14px;
  border-color: transparent;
  background: var(--accent);
  color: #ffffff;
  font-weight: 750;
}

.secondary-action {
  padding: 0 12px;
  background: var(--surface);
  color: var(--text);
  font-weight: 700;
}

.secondary-action:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent-strong);
}

.primary-action:hover:not(:disabled) {
  border-color: var(--accent-strong);
  background: var(--accent-strong);
  color: #ffffff;
}

.workspace {
  position: relative;
  display: grid;
  grid-template-columns: minmax(260px, 360px) minmax(0, 1fr);
  gap: 16px;
  height: calc(100vh - 72px);
  min-height: 540px;
  padding: 16px clamp(16px, 4vw, 36px) 20px;
}

.show-sidebar-button {
  position: absolute;
  top: 16px;
  left: clamp(16px, 4vw, 36px);
  z-index: 3;
  min-height: 34px;
  padding: 0 12px;
  background: rgba(255, 255, 255, 0.82);
  color: var(--text);
  font-weight: 800;
}

.workspace.files-collapsed {
  grid-template-columns: minmax(0, 1fr);
}

.workspace.files-collapsed .file-pane {
  display: none;
}

.file-pane {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  min-width: 260px;
}

.pane-header.file-pane-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
  justify-content: stretch;
  gap: 8px;
}

.file-pane-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  min-width: 0;
}

.file-actions {
  display: grid;
  width: 100%;
  grid-template-columns: 1fr;
  gap: 6px;
}

.file-actions > button {
  width: 100%;
  min-height: 34px;
}

.pane {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.pane-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 52px;
  padding: 0 14px;
  border-bottom: 1px solid var(--line);
  background: var(--surface-alt);
}

.preview-heading {
  display: grid;
  gap: 3px;
  min-width: 0;
}

h2 {
  margin: 0;
  font-size: 0.92rem;
  font-weight: 800;
  letter-spacing: 0;
}

.selected-file {
  overflow: hidden;
  color: var(--muted);
  font-size: 0.82rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.metrics {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
  color: var(--muted);
  font-size: 0.82rem;
}

.status {
  color: var(--accent-strong);
  font-size: 0.82rem;
  font-weight: 700;
}

.file-list {
  overflow: auto;
  padding: 8px;
}

.recent-directories {
  display: grid;
  gap: 8px;
  padding: 10px;
  border-top: 1px solid var(--line);
  background: #fbfcfe;
}

.recent-directories h3 {
  margin: 0;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.recent-directory-list {
  display: grid;
  gap: 4px;
}

.recent-directory {
  min-height: 30px;
  padding: 4px 8px;
  overflow: hidden;
  border-color: transparent;
  background: transparent;
  color: var(--text);
  text-align: left;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.recent-directory:hover {
  border-color: rgba(23, 112, 111, 0.24);
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.tree-item {
  display: block;
  width: 100%;
  min-height: 32px;
  margin: 0 0 2px;
  padding-top: 5px;
  padding-right: 10px;
  padding-bottom: 5px;
  overflow: hidden;
  border-color: transparent;
  background: transparent;
  color: var(--text);
  text-align: left;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tree-item:hover {
  background: #f4faf8;
}

.tree-file[aria-selected="true"] {
  border-color: rgba(23, 112, 111, 0.34);
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-weight: 750;
}

.tree-directory-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
}

.tree-icon {
  display: inline-flex;
  justify-content: center;
  width: 10px;
  color: var(--muted);
  font-size: 0.78rem;
}

.tree-folder-icon {
  position: relative;
  display: inline-block;
  flex: 0 0 auto;
  width: 14px;
  height: 11px;
  border: 1px solid #c48b1d;
  border-radius: 2px;
  background: #f1b94e;
}

.tree-folder-icon::before {
  position: absolute;
  top: -4px;
  left: 1px;
  width: 7px;
  height: 4px;
  border: 1px solid #c48b1d;
  border-bottom: 0;
  border-radius: 2px 2px 0 0;
  background: #f6cf76;
  content: "";
}

.tree-label {
  overflow: hidden;
  text-overflow: ellipsis;
}

.empty-state {
  margin: 0;
  color: var(--muted);
}

.preview {
  overflow: auto;
  padding: 18px clamp(18px, 3vw, 34px) 36px;
  line-height: 1.68;
}

.preview-pane {
  position: relative;
}

.preview-toc {
  position: absolute;
  top: 66px;
  right: 18px;
  z-index: 2;
  display: grid;
  width: min(260px, calc(100% - 36px));
  max-height: min(420px, calc(100% - 86px));
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.45);
  box-shadow: 0 12px 24px rgba(24, 33, 47, 0.08);
}

.preview-toc-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 34px;
  padding: 0 10px;
  border: 0;
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  background: rgba(240, 244, 248, 0.58);
  color: var(--toc-blue);
  font-size: 0.84rem;
  font-weight: 800;
}

.preview-toc-toggle::after {
  color: var(--toc-blue);
  content: "Hide";
  font-size: 0.72rem;
}

.preview-toc-list {
  display: grid;
  gap: 2px;
  max-height: 360px;
  overflow: auto;
  padding: 6px;
}

.preview-toc-link {
  min-height: 28px;
  padding-top: 4px;
  padding-right: 8px;
  padding-bottom: 4px;
  overflow: hidden;
  border-color: transparent;
  background: transparent;
  color: var(--toc-blue);
  font-size: 0.82rem;
  text-align: left;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.preview-toc-link:hover {
  background: rgba(219, 234, 254, 0.52);
  color: #1e40af;
}

.preview-toc-collapsed {
  width: auto;
  max-height: 34px;
}

.preview-toc-collapsed .preview-toc-list {
  display: none;
}

.preview-toc-collapsed .preview-toc-toggle {
  border-bottom: 0;
}

.preview-toc-collapsed .preview-toc-toggle::after {
  content: "Show";
}

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

.preview h1,
.preview h2,
.preview h3,
.preview h4,
.preview h5,
.preview h6 {
  margin: 1.35em 0 0.45em;
  line-height: 1.18;
  letter-spacing: 0;
}

.preview h1 {
  font-size: 2rem;
}

.preview h2 {
  font-size: 1.45rem;
}

.preview h3 {
  font-size: 1.18rem;
}

.preview p,
.preview ul,
.preview ol,
.preview blockquote,
.preview table,
.preview pre {
  margin: 0 0 1rem;
}

.preview a {
  color: var(--accent-strong);
  font-weight: 650;
}

.preview blockquote {
  padding: 10px 14px;
  border-left: 4px solid var(--accent);
  background: #f4faf8;
  color: #334155;
}

.preview table {
  width: 100%;
  overflow: hidden;
  border-collapse: collapse;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 0.94rem;
}

.preview th,
.preview td {
  padding: 9px 11px;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.preview th {
  background: var(--surface-alt);
  font-weight: 800;
}

.preview tbody tr:nth-child(even) {
  background: #fbfcfe;
}

.preview code {
  padding: 2px 5px;
  border-radius: 5px;
  background: var(--code-bg);
  color: var(--code-text);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.92em;
}

.preview pre {
  overflow: auto;
  padding: 14px;
  border: 1px solid #dbe3ec;
  border-radius: 8px;
  background: var(--code-bg);
}

.preview pre code {
  display: block;
  padding: 0;
  border-radius: 0;
  background: transparent;
  color: var(--code-text);
}

.plantuml-diagram {
  display: grid;
  justify-items: start;
  margin: 0 0 1rem;
  padding: 14px;
  overflow: auto;
  border: 1px solid #dbe3ec;
  border-radius: 8px;
  background: #ffffff;
}

.plantuml-diagram img {
  max-width: 100%;
  height: auto;
}

.preview hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 1.5rem 0;
}

@media (max-width: 820px) {
  .topbar {
    align-items: stretch;
    flex-direction: column;
  }

  .workspace {
    grid-template-columns: 1fr;
    height: auto;
    min-height: 0;
  }

  .pane {
    min-height: 420px;
  }

  .file-pane {
    min-height: 280px;
  }

  .preview h1 {
    font-size: 1.55rem;
  }
}