:root {
  --text-primary: #f4ecde;
  --text-secondary: #e2d4bd;
  --text-tertiary: #a89980;
  --bg-app: #12100d;
  --bg-panel: #171411;
  --bg-panel-solid: #171411;
  --bg-muted: #201c17;
  --bg-control: #1b1713;
  --border: rgba(244, 236, 222, 0.11);
  --border-strong: rgba(244, 236, 222, 0.22);
  --accent: #d4b177;
  --accent-soft: rgba(212, 177, 119, 0.16);
  --danger: #e07b66;
  --danger-soft: rgba(224, 123, 102, 0.14);
  --warning: #ddb067;
  --warning-soft: rgba(221, 176, 103, 0.14);
  --shadow-sm: none;
  --shadow-lg: none;
  --font-system: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --font-serif: Iowan Old Style, Palatino, "Palatino Linotype", "Book Antiqua", Georgia, serif;
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: var(--font-system);
  background-color: var(--bg-app);
  background-image:
    linear-gradient(rgba(244, 236, 222, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(244, 236, 222, 0.025) 1px, transparent 1px);
  background-size: 100% 32px, 32px 100%;
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
}

button,
input,
select {
  font: inherit;
}

button,
input,
select {
  outline: none;
}

:where(button, input, select):focus-visible {
  outline: 2px solid rgba(212, 177, 119, 0.52);
  outline-offset: 2px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.shell {
  min-height: 100vh;
  max-width: 1480px;
  margin: 0 auto;
  padding: 8px;
  display: grid;
  gap: 8px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-panel);
  box-shadow: var(--shadow-sm);
}

.brand-block h1,
.panel-header h2 {
  margin: 0;
  font-size: 18px;
  font-weight: 650;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.brand-block h1 {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 600;
}

.panel-label,
.detail-path {
  margin: 0 0 2px;
  font-size: 11px;
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: none;
  color: var(--text-tertiary);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.button {
  min-height: 32px;
  padding: 0 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  background: var(--bg-control);
  color: var(--text-primary);
  font-size: 12px;
  letter-spacing: 0.02em;
  transition: border-color 120ms ease, opacity 120ms ease, background 120ms ease, color 120ms ease;
}

.button:hover {
  background: color-mix(in srgb, var(--bg-control) 92%, white 8%);
  border-color: var(--border-strong);
}

.button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.button-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #171411;
  box-shadow: none;
}

.button-primary:hover {
  background: #e0bc82;
  border-color: #e0bc82;
  color: #171411;
}

.button-ghost {
  background: var(--bg-control);
  color: var(--text-primary);
}

.save-pill {
  min-width: 72px;
  min-height: 28px;
  padding: 0 8px;
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
}

.save-pill[data-status="saving"],
.save-pill[data-status="dirty"] {
  color: var(--accent);
}

.save-pill[data-status="error"],
.save-pill[data-status="conflict"] {
  color: var(--danger);
}

.workspace {
  display: grid;
  grid-template-columns: minmax(280px, 360px) minmax(0, 1fr);
  gap: 0;
  min-height: calc(100vh - 72px);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  background: var(--bg-panel);
}

.sidebar-panel,
.detail-card {
  border: none;
  border-radius: 0;
  background: transparent;
  box-shadow: var(--shadow-lg);
}

.sidebar-panel {
  padding: 10px 10px 8px;
  border-right: 1px solid var(--border);
}

.detail-panel {
  min-width: 0;
}

.detail-card {
  min-height: 100%;
  padding: 12px 14px;
  display: grid;
  align-content: start;
  gap: 10px;
}

.panel-header,
.detail-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.panel-meta,
.detail-meta {
  margin: 0;
  color: var(--text-secondary);
  font-size: 12px;
}

.banner {
  margin-top: 10px;
  padding: 10px 12px;
  border-radius: 6px;
  border: 1px solid transparent;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.banner p {
  margin: 0;
}

.banner-warning {
  background: var(--warning-soft);
  border-color: color-mix(in srgb, var(--warning) 24%, transparent);
  color: var(--warning);
}

.banner-error {
  background: var(--danger-soft);
  border-color: color-mix(in srgb, var(--danger) 24%, transparent);
  color: var(--danger);
}

.banner-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tree-list {
  margin-top: 6px;
  display: grid;
  gap: 2px;
}

.tree-row {
  display: grid;
  grid-template-columns: auto auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 4px;
  min-height: 28px;
  padding: 1px 4px 1px calc(6px + var(--depth) * 12px);
  border: 1px solid transparent;
  border-radius: 4px;
  background: transparent;
  transition: background 120ms ease, border-color 120ms ease;
}

.tree-row:hover {
  background: color-mix(in srgb, var(--bg-muted) 86%, transparent);
}

.tree-row.is-selected {
  background: color-mix(in srgb, var(--bg-muted) 92%, white 2%);
  border-color: var(--border);
}

.tree-row.is-selected .tree-title {
  font-weight: 600;
}

.tree-row.is-dragging {
  opacity: 0.45;
}

.tree-row.is-drop-above {
  box-shadow: inset 0 2px 0 0 var(--border-strong);
}

.tree-row.is-drop-below {
  box-shadow: inset 0 -2px 0 0 var(--border-strong);
}

.tree-row.is-drop-inside {
  border-color: var(--border-strong);
  background: color-mix(in srgb, var(--bg-muted) 84%, white 6%);
}

.tree-row.is-drop-invalid {
  opacity: 0.4;
}

.tree-grip,
.tree-toggle,
.tree-main,
.icon-button {
  border: none;
  background: none;
  color: inherit;
}

.tree-grip,
.tree-toggle {
  width: 18px;
  height: 18px;
  border-radius: 4px;
  color: var(--text-secondary);
}

.tree-grip {
  padding: 0;
  cursor: grab;
}

.tree-main {
  padding: 1px 0;
  display: inline-flex;
  align-items: center;
  min-width: 0;
  cursor: pointer;
}

.tree-title {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tree-actions {
  display: flex;
  gap: 2px;
}

.icon-button {
  width: 20px;
  height: 20px;
  border-radius: 4px;
  cursor: pointer;
  color: var(--text-tertiary);
}

.icon-button:hover,
.tree-grip:hover,
.tree-toggle:hover {
  background: color-mix(in srgb, var(--bg-muted) 88%, transparent);
  color: var(--text-primary);
}

.tree-end-drop {
  min-height: 8px;
  border-radius: 4px;
}

.tree-end-drop.is-drop-before,
.detail-row.is-drop-before {
  box-shadow: inset 0 2px 0 0 var(--border-strong);
}

.detail-title-row {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}

.detail-title-input,
.detail-input,
.composer-input {
  width: 100%;
  min-height: 34px;
  padding: 0 10px;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--bg-control);
  color: var(--text-primary);
}

.detail-title-input {
  max-width: 560px;
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 700;
  min-height: 38px;
  padding-inline: 0;
  border: none;
  border-bottom: 1px solid transparent;
  border-radius: 0;
  background: transparent;
}

.detail-title-input:focus {
  border-bottom-color: var(--border-strong);
}

.detail-header-actions {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.detail-list {
  margin-top: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.detail-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto auto;
  gap: 6px;
  align-items: center;
  min-height: 30px;
  padding: 3px 4px;
  border-radius: 0;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border);
}

.detail-row:last-child {
  border-bottom: none;
}

.detail-row:hover {
  background: color-mix(in srgb, var(--bg-muted) 82%, transparent);
}

.drag-handle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  border-radius: 4px;
  border: none;
  background: none;
  padding: 0;
  color: var(--text-tertiary);
  user-select: none;
  cursor: grab;
}

.tree-grip:active,
.drag-handle:active {
  cursor: grabbing;
}

.detail-row.is-dragging,
.sortable-ghost {
  opacity: 0.45;
}

.sortable-chosen {
  background: color-mix(in srgb, var(--bg-muted) 90%, white 2%);
}

.empty-state,
.empty-list,
.sidebar-empty {
  min-height: 96px;
  display: grid;
  place-items: center;
  text-align: center;
  color: var(--text-secondary);
}

.empty-state h2,
.empty-list p,
.sidebar-empty p {
  margin: 0;
}

.composer {
  margin-top: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 6px;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(7, 10, 16, 0.58);
  display: grid;
  place-items: center;
  padding: 24px;
}

.modal-card {
  width: min(520px, 100%);
  padding: 18px;
  border-radius: 8px;
  background: var(--bg-panel-solid);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
}

.modal-card h2 {
  margin: 0 0 8px;
}

.modal-card p {
  margin: 0;
  color: var(--text-secondary);
  line-height: 1.55;
}

.modal-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 14px;
}

@media (max-width: 980px) {
  .workspace {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .sidebar-panel {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
}

@media (max-width: 720px) {
  .shell {
    padding: 6px;
  }

  .topbar {
    border-radius: 8px;
    padding: 8px;
  }

  .topbar-actions,
  .detail-header,
  .panel-header {
    flex-direction: column;
    align-items: stretch;
  }

  .composer {
    grid-template-columns: 1fr;
  }

  .detail-row {
    grid-template-columns: auto minmax(0, 1fr);
  }

  .detail-row .button {
    grid-column: 2;
    justify-self: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}