:root {
  --border: #d0d5dc;
  --bg: #ffffff;
  --accent: #2563eb;
  --danger: #dc2626;
  --muted: #6b7280;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  font-family: -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif;
  color: #1f2937;
}

body { display: flex; flex-direction: column; }

.toolbar {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

.toolbar h1 { font-size: 16px; margin: 0; margin-right: auto; }

.actions { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }

button {
  padding: 7px 14px;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
}

button:hover { border-color: var(--accent); color: var(--accent); }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.primary:hover { filter: brightness(1.08); color: #fff; }
button.danger { color: var(--danger); }
button.danger:hover { border-color: var(--danger); }

#f-lang, #f-export {
  padding: 5px 6px;
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
}

.nav-link {
  padding: 7px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 13px;
  color: var(--accent);
  text-decoration: none;
  white-space: nowrap;
}
.nav-link:hover { border-color: var(--accent); background: #f0f4ff; }

.seg { display: inline-flex; border: 1px solid var(--border); border-radius: 6px; overflow: hidden; }
.seg .seg-btn { border: none; border-radius: 0; padding: 5px 12px; }
.seg .seg-btn.active { background: var(--accent); color: #fff; }
.seg .seg-btn.active:hover { color: #fff; border-color: transparent; }

.toolbar label.tool {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 13px;
  white-space: nowrap;
}
.toolbar label.tool select {
  padding: 5px 6px;
  border: 1px solid var(--border);
  border-radius: 6px;
}
.toolbar label.tool input[type="number"] {
  width: 48px;
  padding: 5px 6px;
  border: 1px solid var(--border);
  border-radius: 6px;
}

.layout { flex: 1; display: flex; min-height: 0; }

.canvas-wrap {
  flex: 1;
  position: relative;
  padding: 16px;
  overflow: auto;
  background: #eef1f5;
}

#board {
  max-width: 100%;
  background: #fff;
  box-shadow: 0 1px 6px rgba(0,0,0,0.15);
  cursor: grab;
  touch-action: none;
  transform-origin: 0 0;
}
#board.dragging { cursor: grabbing; }
#board.pin-mode,
#board.pin-mode .component-image { cursor: crosshair; }
#board.cropping { cursor: crosshair; }
.crop-handle { cursor: move; }

.hint {
  position: absolute;
  top: 24px;
  left: 50%;
  transform: translateX(-50%);
  padding: 6px 12px;
  background: rgba(0,0,0,0.65);
  color: #fff;
  border-radius: 6px;
  font-size: 12px;
  pointer-events: none;
  max-width: 90%;
  text-align: center;
}

/* 器件 */
.component-image { cursor: move; }
[data-part="header"] { cursor: move; }
.component.selected .component-image { filter: drop-shadow(0 0 0 #f59e0b); }
.component.selected .component-image { outline: 2px solid #f59e0b; outline-offset: 2px; }

/* 引脚 */
.pin circle { cursor: crosshair; }
.pin.selected circle { stroke: #f59e0b; stroke-width: 3; }
.pin-label {
  font-family: ui-monospace, Consolas, "Microsoft YaHei", monospace;
  font-weight: 600;
  paint-order: stroke;
  stroke-width: 3px;
  stroke-linejoin: round;
}

/* 连线 */
.wire-group { cursor: pointer; }
.wire-group:hover .wire { stroke-width: 3.5; }
.wire-group.selected .wire { filter: drop-shadow(0 0 2px rgba(245,158,11,0.9)); }

.panel {
  width: 280px;
  border-left: 1px solid var(--border);
  background: var(--bg);
  overflow-y: auto;
  padding: 16px;
}

.panel-section { margin-bottom: 24px; }
.panel-section h2 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin: 0 0 10px;
}

.panel label { display: block; font-size: 13px; margin-bottom: 12px; }
.panel label.check { display: flex; align-items: center; gap: 6px; }
.panel button { margin: 0 6px 8px 0; }
.panel input[type="color"] {
  width: 100%;
  height: 30px;
  padding: 2px;
  margin-top: 4px;
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  background: #fff;
}
.color-row {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}
.color-row label {
  flex: 1;
  min-width: 0;
  margin-bottom: 0;
}
.num-row {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}
.num-row label {
  flex: 1;
  min-width: 0;
  margin-bottom: 0;
}
.panel input[type="number"] {
  width: 100%;
  margin-top: 4px;
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 13px;
}
.field-label { font-size: 13px; color: var(--muted); margin: 4px 0 6px; }
.pos-grid {
  display: grid;
  grid-template-columns: repeat(3, 30px);
  grid-template-rows: repeat(3, 30px);
  gap: 3px;
}
.pos-grid button {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  line-height: 1;
  color: var(--muted);
  width: 100%;
  height: 100%;
  box-sizing: border-box;
}
.pos-grid button:hover { border-color: var(--accent); color: var(--accent); }
.pos-grid button.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.pos-grid .pos-center {
  display: flex;
  align-items: center;
  justify-content: center;
  background: #f4f5f7;
  border-radius: 6px;
  width: 100%;
  height: 100%;
  box-sizing: border-box;
}
.pos-grid .pos-center::after {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--muted);
}
.panel input[type="text"], .panel select {
  width: 100%;
  margin-top: 4px;
  padding: 7px 9px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 13px;
}

.muted { color: var(--muted); font-size: 13px; line-height: 1.7; }

.legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  column-gap: 10px;
}
.legend li { display: flex; align-items: center; gap: 8px; padding: 4px 0; font-size: 13px; }
.legend .swatch { width: 18px; height: 4px; border-radius: 2px; }
.legend .name { color: var(--muted); }