:root {
  --rt-purple: #7700FF;
  --rt-purple-dark: #5500B3;
  --rt-orange: #FF4F12;
  --rt-yellow: #FFB800;
  --rt-bg: #F5F5F7;
  --rt-card: #FFFFFF;
  --rt-text: #1A1A1A;
  --rt-text-muted: #666;
  --rt-border: #D9D9DE;
  --rt-row-tint: #F1B89A;
  --rt-grid: #E6E6EA;
  --rt-grid-strong: #BFBFC7;
  font-family: 'Rostelecom Basis', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; }
body {
  background: var(--rt-bg);
  color: var(--rt-text);
  font-size: 14px;
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

/* ==================== Topbar ==================== */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 16px;
  background: linear-gradient(90deg, var(--rt-purple) 0%, #9B33FF 50%, var(--rt-orange) 100%);
  color: #fff;
  flex-shrink: 0;
  box-shadow: 0 2px 6px rgba(0,0,0,0.08);
}
.topbar-left { display: flex; align-items: baseline; gap: 10px; }
.brand { font-size: 18px; font-weight: 700; letter-spacing: -0.3px; }
.brand-sub { font-size: 12px; opacity: 0.85; }
.topbar-center, .topbar-right { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.topbar-center label { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; }
.topbar-center input[type=number] {
  width: 80px; padding: 5px 8px; border-radius: 6px; border: none;
  background: rgba(255,255,255,0.95); color: var(--rt-text); font-weight: 600;
}

.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 12px;
  border-radius: 6px;
  border: 1px solid rgba(255,255,255,0.4);
  background: rgba(255,255,255,0.15);
  color: #fff;
  font-size: 13px;
  cursor: pointer;
  user-select: none;
  list-style: none;
  font-family: inherit;
}
.btn:hover { background: rgba(255,255,255,0.28); }
.btn-primary { background: #fff; color: var(--rt-purple); border-color: #fff; font-weight: 600; }
.btn-primary:hover { background: #fff; color: var(--rt-purple-dark); }

.menu { position: relative; }
.menu summary { list-style: none; }
.menu summary::-webkit-details-marker { display: none; }
.menu-body {
  position: absolute; top: calc(100% + 6px); right: 0;
  background: #fff; color: var(--rt-text);
  border-radius: 8px; padding: 6px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.15);
  display: flex; flex-direction: column; min-width: 180px;
  z-index: 100;
}
.menu-item {
  display: block; width: 100%; text-align: left;
  padding: 8px 12px; border: none; background: none;
  font-size: 13px; cursor: pointer; border-radius: 4px;
  font-family: inherit; color: inherit;
}
.menu-item:hover { background: var(--rt-bg); }

/* ==================== Workspace ==================== */
.workspace {
  display: grid;
  grid-template-columns: 280px 1fr 320px;
  gap: 0;
  flex: 1;
  min-height: 0;
}

.sidebar {
  background: var(--rt-card);
  border-right: 1px solid var(--rt-border);
  overflow-y: auto;
  padding: 12px;
}
.sidebar-right { border-right: none; border-left: 1px solid var(--rt-border); }

.panel { margin-bottom: 18px; }
.panel h3 { margin: 0 0 8px; font-size: 13px; text-transform: uppercase; color: var(--rt-text-muted); letter-spacing: 0.5px; font-weight: 600; }
.panel h3 small { font-weight: 400; text-transform: none; letter-spacing: 0; color: var(--rt-text-muted); margin-left: 6px; font-size: 11px; }

/* Groups & projects in sidebar */
.group-card { background: var(--rt-bg); border-radius: 8px; padding: 8px; margin-bottom: 8px; border: 1px solid transparent; }
.group-card.selected { border-color: var(--rt-purple); }
.group-head { display: flex; align-items: center; gap: 6px; }
.group-color { width: 14px; height: 14px; border-radius: 3px; flex-shrink: 0; cursor: pointer; }
.group-name { flex: 1; font-weight: 600; font-size: 13px; cursor: pointer; padding: 2px 4px; border-radius: 4px; }
.group-name:hover { background: rgba(0,0,0,0.05); }
.group-name[contenteditable=true] { background: #fff; outline: 2px solid var(--rt-purple); }
.icon-btn { background: none; border: none; color: var(--rt-text-muted); cursor: pointer; padding: 2px 4px; font-size: 14px; border-radius: 3px; }
.icon-btn:hover { background: rgba(0,0,0,0.08); color: var(--rt-text); }

.project-list { margin-top: 6px; padding-left: 18px; }
.project-row { display: flex; align-items: center; gap: 6px; padding: 3px 4px; border-radius: 4px; cursor: pointer; }
.project-row:hover { background: rgba(0,0,0,0.05); }
.project-row.selected { background: rgba(119,0,255,0.12); }
.project-row .project-name { flex: 1; font-size: 12px; padding: 1px 3px; border-radius: 3px; }
.project-row .project-name[contenteditable=true] { background: #fff; outline: 2px solid var(--rt-purple); }

.btn-link {
  background: none; border: none; color: var(--rt-purple); cursor: pointer;
  font-size: 12px; padding: 4px 6px; font-family: inherit;
}
.btn-link:hover { text-decoration: underline; }

/* Marker palette */
.marker-palette { display: flex; flex-direction: column; gap: 4px; }
.palette-item {
  display: flex; align-items: center; gap: 8px;
  padding: 5px 8px; border-radius: 6px;
  background: var(--rt-bg);
  cursor: grab; font-size: 12px;
  border: 1px solid transparent;
}
.palette-item:hover { border-color: var(--rt-purple); }
.palette-item:active { cursor: grabbing; }
.palette-item .palette-shape { width: 18px; height: 18px; flex-shrink: 0; display: flex; align-items: center; justify-content: center; }

/* ==================== Canvas / Slide ==================== */
.canvas-wrap {
  background: var(--rt-bg);
  overflow: auto;
  padding: 16px;
  display: flex;
  align-items: flex-start;
  justify-content: center;
}
.slide {
  background: #fff;
  width: 1600px;
  min-width: 1600px;
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.08);
  overflow: hidden;
}
#slideSvg { display: block; width: 100%; height: auto; }
#slideSvg .marker { cursor: grab; }
#slideSvg .marker.dragging { cursor: grabbing; }
#slideSvg .marker.selected { filter: drop-shadow(0 0 4px var(--rt-purple)); }
#slideSvg .marker.connect-source { filter: drop-shadow(0 0 6px var(--rt-orange)); }
#slideSvg .row-bg.selected { fill: rgba(119,0,255,0.04); }
#slideSvg text { font-family: 'Rostelecom Basis', 'Inter', system-ui, sans-serif; }

/* ==================== Properties panel ==================== */
.props-panel { display: flex; flex-direction: column; gap: 12px; }
.props-panel h3 { margin: 0 0 4px; font-size: 13px; text-transform: uppercase; color: var(--rt-text-muted); letter-spacing: 0.5px; font-weight: 600; }
.props-panel .hint { color: var(--rt-text-muted); font-style: italic; font-size: 13px; }
.props-panel .field { display: flex; flex-direction: column; gap: 4px; }
.props-panel .field label { font-size: 11px; color: var(--rt-text-muted); text-transform: uppercase; letter-spacing: 0.4px; }
.props-panel .field input,
.props-panel .field select,
.props-panel .field textarea {
  padding: 6px 8px; border-radius: 6px; border: 1px solid var(--rt-border);
  background: #fff; font-size: 13px; font-family: inherit; color: inherit;
}
.props-panel .field input[type=color] { padding: 2px; height: 32px; }
.props-panel .row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.props-panel .actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 8px; }
.btn-secondary {
  padding: 6px 12px; border-radius: 6px; border: 1px solid var(--rt-border);
  background: #fff; cursor: pointer; font-size: 12px; font-family: inherit;
}
.btn-secondary:hover { background: var(--rt-bg); }
.btn-danger { color: #b00020; border-color: #f5b1b9; }
.btn-danger:hover { background: #ffeef0; }
.btn-accent { background: var(--rt-purple); color: #fff; border-color: var(--rt-purple); }
.btn-accent:hover { background: var(--rt-purple-dark); border-color: var(--rt-purple-dark); }

.connect-list { display: flex; flex-direction: column; gap: 4px; margin-top: 4px; }
.connect-item {
  display: flex; align-items: center; gap: 6px;
  padding: 4px 6px; background: var(--rt-bg); border-radius: 6px; font-size: 12px;
}
.connect-item .swatch { width: 14px; height: 14px; border-radius: 3px; flex-shrink: 0; }
.connect-item .connect-info { flex: 1; }
.connect-item button { margin-left: auto; }

/* ==================== Toast ==================== */
.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%) translateY(100px);
  background: #1a1a1a; color: #fff; padding: 10px 16px; border-radius: 8px;
  font-size: 13px; opacity: 0; pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 1000;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ==================== Mobile ==================== */
@media (max-width: 1100px) {
  .workspace { grid-template-columns: 240px 1fr 280px; }
  .slide { width: 1400px; min-width: 1400px; }
}
@media (max-width: 768px) {
  body { overflow: auto; height: auto; }
  .workspace { grid-template-columns: 1fr; }
  .sidebar, .sidebar-right { border: none; border-bottom: 1px solid var(--rt-border); max-height: 40vh; }
  .canvas-wrap { padding: 8px; }
  .slide { width: 1200px; min-width: 1200px; }
  .topbar { flex-wrap: wrap; }
}