:root {
  --bg-canvas: #10151c;
  --bg-panel: #1a212b;
  --bg-panel-raised: #212a36;
  --border: #2c3644;
  --text-primary: #e8ecf1;
  --text-muted: #8a97a8;
  --accent: #d68c45;
  --accent-hover: #e39d5a;
  --danger: #d46a6a;
  --font-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font-ui);
  background: var(--bg-canvas);
  color: var(--text-primary);
  height: 100vh;
  overflow: hidden;
}

.screen { height: 100vh; }

/* --- Login --- */
#login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
}
#login-form {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 40px;
  width: 300px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
#login-form h1 {
  margin: 0 0 12px 0;
  font-size: 20px;
  letter-spacing: 0.02em;
  color: var(--text-primary);
}
#login-form input {
  background: var(--bg-panel-raised);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 10px 12px;
  border-radius: 6px;
  font-size: 14px;
}
#login-form input:focus {
  outline: none;
  border-color: var(--accent);
}
.error { color: var(--danger); font-size: 13px; min-height: 16px; margin: 0; }

/* --- App layout --- */
#app-screen {
  display: grid;
  grid-template-columns: 280px 1fr;
  height: 100vh;
}

#sidebar {
  background: var(--bg-panel);
  border-right: 1px solid var(--border);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  overflow-y: auto;
}
.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.sidebar-header h2 {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
}
#logout-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 4px 10px;
  border-radius: 5px;
  cursor: pointer;
  font-size: 12px;
}
#logout-btn:hover { color: var(--text-primary); border-color: var(--text-muted); }

.primary-btn {
  background: var(--accent);
  color: #1a1208;
  border: none;
  padding: 10px 14px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 13px;
  cursor: pointer;
}
.primary-btn:hover { background: var(--accent-hover); }

.search-box input {
  width: 100%;
  background: var(--bg-panel-raised);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 8px 10px;
  border-radius: 6px;
  font-size: 13px;
}

.secondary-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 8px 10px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 12px;
  width: 100%;
}
.secondary-btn:hover { color: var(--text-primary); border-color: var(--text-muted); }

.sidebar-section-title {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-top: 6px;
}

#canvas-list { display: flex; flex-direction: column; gap: 2px; max-height: 220px; overflow-y: auto; flex-shrink: 0; }

.type-field-group { display: none; flex-direction: column; gap: 4px; }
.type-field-group.active { display: flex; }

#admin-panel {
  border-top: 1px solid var(--border);
  padding-top: 14px;
  margin-top: 4px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
#readonly-user-list { display: flex; flex-direction: column; gap: 4px; }
.readonly-user-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 13px;
  background: var(--bg-panel-raised);
}
.readonly-user-row button {
  background: none;
  border: none;
  color: var(--danger);
  cursor: pointer;
  font-size: 12px;
}
.canvas-list-empty { font-size: 12px; color: var(--text-muted); font-style: italic; padding: 4px 2px; }

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  flex: 1;
  min-width: 0;
}
.checkbox-row input[type="checkbox"] { accent-color: var(--accent); cursor: pointer; flex-shrink: 0; }
.checkbox-row span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

#element-list { display: flex; flex-direction: column; gap: 4px; }
.element-list-item {
  padding: 8px 10px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.element-list-item:hover { background: var(--bg-panel-raised); }
.element-list-item .type-tag {
  font-size: 10px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

#graph-container {
  position: relative;
  background: var(--bg-canvas);
}

/* --- Detail panel --- */
#detail-panel {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 280px;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
}
#close-panel-btn {
  position: absolute;
  top: 8px;
  right: 10px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 18px;
  cursor: pointer;
}
#detail-content h3 { margin: 0 0 4px 0; font-size: 15px; }
#detail-content .meta { color: var(--text-muted); font-size: 12px; margin-bottom: 10px; }
#detail-content .meta-fields { display: flex; flex-direction: column; gap: 3px; margin-bottom: 10px; font-size: 13px; }
#detail-content .meta-row { display: flex; gap: 6px; }
#detail-content .meta-label { color: var(--text-muted); min-width: 70px; flex-shrink: 0; }
#detail-content .notes { font-size: 13px; line-height: 1.5; white-space: pre-wrap; }
#detail-content .hint { font-size: 11px; color: var(--text-muted); margin-top: 10px; font-style: italic; }
#detail-content .actions { margin-top: 14px; display: flex; gap: 8px; }
#detail-content button {
  background: var(--bg-panel-raised);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 6px 10px;
  border-radius: 5px;
  font-size: 12px;
  cursor: pointer;
}
#detail-content button.danger { color: var(--danger); border-color: var(--danger); }

/* --- Modals --- */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(8, 10, 14, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
}
.modal-content {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
  width: 340px;
}
.modal-content h3 { margin: 0 0 16px 0; font-size: 16px; }
.modal-content form { display: flex; flex-direction: column; gap: 4px; }
.modal-content label { font-size: 12px; color: var(--text-muted); margin-top: 8px; }
.modal-content input,
.modal-content select,
.modal-content textarea {
  background: var(--bg-panel-raised);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 8px 10px;
  border-radius: 6px;
  font-size: 13px;
  font-family: inherit;
  resize: vertical;
}
.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 18px;
}
.modal-actions button:not(.primary-btn) {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 8px 14px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
}