*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --sidebar-width: 300px;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-danger: #dc2626;
  --color-danger-hover: #b91c1c;
  --color-bg: #f3f4f6;
  --color-surface: #ffffff;
  --color-border: #e5e7eb;
  --color-text: #1f2937;
  --color-text-muted: #6b7280;
  --color-point: #dc2626;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  height: 100vh;
  overflow: hidden;
}

#app {
  display: flex;
  height: 100vh;
}

#sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  padding: 20px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

#sidebar h1 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0;
}

.subtitle {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 12px;
}

.panel {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 14px;
  margin-bottom: 8px;
}

.panel h2 {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-bottom: 10px;
}

.form-group {
  margin-bottom: 8px;
}

.form-group label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  margin-bottom: 3px;
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 6px 10px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 0.85rem;
  background: var(--color-surface);
  color: var(--color-text);
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.15);
}

.form-row {
  display: flex;
  gap: 8px;
}

.form-row .form-group {
  flex: 1;
}

.hint {
  display: block;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: 2px;
}

.hidden {
  display: none !important;
}

.btn {
  display: block;
  width: 100%;
  padding: 8px 16px;
  border: none;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s;
}

.btn-primary {
  background: var(--color-primary);
  color: white;
}

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

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

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

#diagram-container {
  flex: 1;
  display: flex;
  align-items: stretch;
  justify-content: stretch;
  padding: 12px;
  min-width: 0;
}

#diagram-container svg {
  width: 100%;
  height: 100%;
  background: var(--color-surface);
  border-radius: 8px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.point-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 8px 10px;
  margin-bottom: 6px;
  font-size: 0.78rem;
  position: relative;
}

.point-card .point-label {
  font-weight: 600;
  color: var(--color-point);
  margin-bottom: 4px;
}

.point-card .point-values {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px 8px;
  color: var(--color-text);
}

.point-card .btn-remove {
  position: absolute;
  top: 6px;
  right: 6px;
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  padding: 2px;
}

.point-card .btn-remove:hover {
  color: var(--color-danger);
}

.tooltip {
  position: absolute;
  pointer-events: none;
  background: rgba(31, 41, 55, 0.92);
  color: white;
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 0.78rem;
  line-height: 1.5;
  white-space: nowrap;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}