:root {
  --bg: #0f1419;
  --bg-elevated: #1a2332;
  --bg-panel: #151d28;
  --border: #2a3544;
  --text: #e8edf4;
  --text-muted: #8b9cb3;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --danger: #ef4444;
  --success: #22c55e;
  --radius: 10px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
  --font: "DM Sans", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.muted {
  color: var(--text-muted);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.55rem 1rem;
  border-radius: 8px;
  border: 1px solid transparent;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.btn-sm {
  padding: 0.35rem 0.7rem;
  font-size: 0.875rem;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}

.btn-ghost:hover {
  background: var(--bg-elevated);
}

.btn-danger {
  background: transparent;
  border-color: var(--danger);
  color: var(--danger);
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, #3b82f6, #06b6d4);
  color: #fff;
  font-weight: 700;
  font-size: 0.95rem;
}

.brand-mark.sm {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  font-size: 0.75rem;
}

.auth-layout {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 2rem;
  background:
    radial-gradient(ellipse at 20% 20%, rgba(59, 130, 246, 0.15), transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(6, 182, 212, 0.1), transparent 50%),
    var(--bg);
}

.auth-card {
  width: min(420px, 100%);
  padding: 2rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
}

.brand {
  display: flex;
  gap: 1rem;
  align-items: center;
  margin-bottom: 1.75rem;
}

.brand h1 {
  margin: 0;
  font-size: 1.5rem;
}

.brand p {
  margin: 0.25rem 0 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.auth-form label,
.modal label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.875rem;
  font-weight: 500;
}

.auth-form,
.modal form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

input,
select,
textarea {
  font: inherit;
  padding: 0.6rem 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-panel);
  color: var(--text);
}

input:focus,
select:focus,
textarea:focus {
  outline: 2px solid rgba(59, 130, 246, 0.45);
  border-color: var(--accent);
}

.hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 400;
}

.form-error {
  margin: 0;
  color: var(--danger);
  font-size: 0.875rem;
}

.auth-footer {
  margin: 1.25rem 0 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elevated);
}

.topbar-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.dashboard {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1.25rem;
}

.dashboard-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.dashboard-header h1 {
  margin: 0 0 0.35rem;
}

.drawings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.drawing-card {
  display: block;
  padding: 1.25rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: inherit;
  text-decoration: none;
  transition: border-color 0.15s, transform 0.15s;
}

.drawing-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  text-decoration: none;
}

.drawing-card h3 {
  margin: 0 0 0.5rem;
}

.drawing-card p {
  margin: 0 0 1rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.4;
}

.drawing-meta {
  display: flex;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--mono);
}

.empty-state {
  text-align: center;
  padding: 3rem;
  color: var(--text-muted);
}

.modal {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 0;
  background: var(--bg-elevated);
  color: var(--text);
  box-shadow: var(--shadow);
  max-width: 480px;
  width: calc(100% - 2rem);
}

.modal-wide {
  max-width: 640px;
}

.modal::backdrop {
  background: rgba(0, 0, 0, 0.6);
}

.modal form {
  padding: 1.5rem;
}

.modal h2 {
  margin: 0 0 1rem;
}

.modal-actions {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.modal-actions .spacer {
  flex: 1;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.form-grid .span-2 {
  grid-column: span 2;
}

.checkbox-label {
  flex-direction: row !important;
  align-items: center;
  gap: 0.5rem !important;
}

.editor-topbar .topbar-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.drawing-title-block {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.drawing-name-input {
  font-size: 1.1rem;
  font-weight: 600;
  background: transparent;
  border: 1px solid transparent;
  padding: 0.25rem 0.5rem;
  min-width: 200px;
}

.drawing-name-input:hover,
.drawing-name-input:focus {
  border-color: var(--border);
  background: var(--bg-panel);
}

.revision-badge {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  padding: 0.15rem 0.45rem;
  border: 1px solid var(--border);
  border-radius: 999px;
}

.view-toggle {
  display: flex;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.view-tab {
  padding: 0.4rem 0.75rem;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font: inherit;
  font-size: 0.85rem;
  cursor: pointer;
}

.view-tab.active {
  background: var(--accent);
  color: #fff;
}

.editor {
  display: grid;
  grid-template-columns: 280px 1fr;
  height: calc(100vh - 57px);
}

.editor-sidebar {
  border-right: 1px solid var(--border);
  background: var(--bg-panel);
  overflow-y: auto;
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.panel {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem;
}

.panel h2 {
  margin: 0 0 0.75rem;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.panel-header h2 {
  margin: 0;
}

.toggle-grid {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  font-size: 0.85rem;
}

.toggle-row select {
  max-width: 140px;
  font-size: 0.8rem;
  padding: 0.35rem 0.5rem;
}

.toggle-switch {
  position: relative;
  width: 40px;
  height: 22px;
  flex-shrink: 0;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--border);
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.15s;
}

.toggle-slider::before {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  left: 3px;
  top: 3px;
  background: #fff;
  border-radius: 50%;
  transition: transform 0.15s;
}

.toggle-switch input:checked + .toggle-slider {
  background: var(--accent);
}

.toggle-switch input:checked + .toggle-slider::before {
  transform: translateX(18px);
}

.quick-list {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  max-height: 180px;
  overflow-y: auto;
}

.quick-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.5rem;
  border-radius: 6px;
  font-size: 0.8rem;
  cursor: pointer;
  border: 1px solid transparent;
}

.quick-item:hover {
  background: var(--bg-panel);
  border-color: var(--border);
}

.quick-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.editor-main {
  display: grid;
  overflow: hidden;
}

.editor-main.view-split {
  grid-template-columns: 1fr 1fr;
}

.editor-main.view-list {
  grid-template-columns: 1fr;
}

.editor-main.view-list .graph-pane {
  display: none;
}

.editor-main.view-graph {
  grid-template-columns: 1fr;
}

.editor-main.view-graph .list-pane {
  display: none;
}

.list-pane,
.graph-pane {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-right: 1px solid var(--border);
}

.graph-pane {
  border-right: none;
}

.pane-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elevated);
}

.pane-header h2 {
  margin: 0;
  font-size: 0.95rem;
}

.list-sections {
  overflow-y: auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.list-sections h3 {
  margin: 0 0 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.data-table th,
.data-table td {
  padding: 0.55rem 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.data-table th {
  background: var(--bg-panel);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.data-table tr:last-child td {
  border-bottom: none;
}

.data-table tr:hover td {
  background: rgba(59, 130, 246, 0.06);
}

.table-actions {
  display: flex;
  gap: 0.25rem;
}

.icon-btn {
  padding: 0.25rem 0.45rem;
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 4px;
  font-size: 0.8rem;
}

.icon-btn:hover {
  background: var(--bg-elevated);
  color: var(--text);
}

.network-graph {
  flex: 1;
  min-height: 0;
  background: var(--bg);
}

.badge {
  display: inline-block;
  padding: 0.15rem 0.45rem;
  border-radius: 999px;
  font-size: 0.7rem;
  font-family: var(--mono);
  background: var(--bg-panel);
  border: 1px solid var(--border);
}

.badge-yes {
  color: var(--success);
  border-color: rgba(34, 197, 94, 0.35);
}

body.graph-light .network-graph {
  background: #f8fafc;
}

@media (max-width: 900px) {
  .editor {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
    height: auto;
    min-height: calc(100vh - 57px);
  }

  .editor-sidebar {
    border-right: none;
    border-bottom: 1px solid var(--border);
    max-height: 280px;
  }

  .editor-main.view-split {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr 1fr;
    min-height: 800px;
  }
}