:root {
  --bg-page: #f8fafc;
  --bg-card: #ffffff;
  --bg-subtle: #f1f5f9;
  --text-main: #0f172a;
  --text-muted: #475569;
  --border-color: #cbd5e1;
  --brand-red: #d62828;
  --brand-red-hover: #b91c1c;
  --doc-blue: #1d4ed8;
  --doc-blue-hover: #1e40af;
  --check-green: #15803d;
  --check-green-hover: #166534;
  --warn-amber: #b45309;
  --radius-md: 10px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  padding-bottom: 4rem;
}

/* Header */
.app-header {
  background-color: var(--bg-card);
  border-bottom: 3px solid var(--brand-red);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 1360px;
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand-group {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.brand-badge {
  background-color: var(--brand-red);
  color: #ffffff;
  font-weight: 800;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  text-transform: uppercase;
}

.brand-titles h1 {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
}

.brand-titles p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.header-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* Container & Grid */
.container {
  max-width: 1360px;
  margin: 1.25rem auto;
  padding: 0 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
}

.card-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--bg-subtle);
}

.card-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.step-badge {
  background-color: var(--doc-blue);
  color: #ffffff;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
}

/* Forms */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 0.9rem;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  min-width: 0;
}

.form-field label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
}

.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  min-width: 0;
  max-width: 100%;
  box-sizing: border-box;
  min-height: 44px;
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  color: var(--text-main);
  background-color: #ffffff;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-field input:focus,
.form-field select:focus {
  outline: none;
  border-color: var(--doc-blue);
  box-shadow: 0 0 0 3px rgba(29, 78, 216, 0.15);
}

/* Buttons */
.btn {
  min-height: 44px;
  padding: 0.55rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  font-weight: 700;
  border: 1px solid transparent;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  transition: background-color 0.15s ease, transform 0.08s ease, border-color 0.15s ease;
  user-select: none;
  text-decoration: none;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background-color: var(--brand-red);
  color: #ffffff;
}

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

.btn-blue {
  background-color: var(--doc-blue);
  color: #ffffff;
}

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

.btn-green {
  background-color: var(--check-green);
  color: #ffffff;
}

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

.btn-outline {
  background-color: #ffffff;
  color: var(--text-main);
  border-color: var(--border-color);
}

.btn-outline:hover {
  background-color: var(--bg-subtle);
  border-color: #94a3b8;
}

.btn-sm {
  min-height: 44px;
  padding: 0.4rem 0.75rem;
  font-size: 0.85rem;
}

/* Toolbars for Adding Components & Room Chips */
.config-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.row-selector-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 1rem;
}

.row-tab {
  min-height: 44px;
  padding: 0.5rem 0.95rem;
  border-radius: var(--radius-md);
  border: 2px solid var(--border-color);
  background: #ffffff;
  color: var(--text-main);
  font-weight: 700;
  cursor: pointer;
}

.row-tab.active {
  border-color: var(--doc-blue);
  background-color: #eff6ff;
  color: var(--doc-blue);
}

.component-palette {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(205px, 1fr));
  gap: 0.6rem;
  margin-bottom: 1rem;
}

.comp-btn {
  min-height: 48px;
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  border-left: 6px solid var(--doc-blue);
  background-color: #ffffff;
  color: var(--text-main);
  font-weight: 700;
  font-size: 0.88rem;
  text-align: left;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  justify-content: center;
  box-shadow: var(--shadow-sm);
}

.comp-btn:hover {
  background-color: #f8fafc;
  border-color: #94a3b8;
}

.comp-btn span.comp-meta {
  font-size: 0.76rem;
  color: var(--text-muted);
  font-weight: 600;
}

.comp-btn[data-type="RCD"] { border-left-color: var(--doc-blue); }
.comp-btn[data-type="LS1P"] { border-left-color: #0f172a; }
.comp-btn[data-type="LS3P"] { border-left-color: var(--brand-red); }
.comp-btn[data-type="FILS"] { border-left-color: #0284c7; }
.comp-btn[data-type="AFDD"] { border-left-color: #d97706; }
.comp-btn[data-type="SPD"] { border-left-color: #dc2626; }
.comp-btn[data-type="HS"] { border-left-color: var(--check-green); }
.comp-btn[data-type="RES"] { border-left-color: #94a3b8; }

/* Room Quick Chips */
.room-chips-wrap {
  background-color: var(--bg-subtle);
  padding: 0.9rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.room-chips-header {
  font-size: 0.86rem;
  font-weight: 700;
  margin-bottom: 0.55rem;
  color: var(--text-main);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.chips-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.room-chip {
  min-height: 44px;
  padding: 0.45rem 0.8rem;
  border-radius: 999px;
  border: 1px solid #cbd5e1;
  background-color: #ffffff;
  color: var(--text-main);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.12s ease;
}

.room-chip:hover {
  border-color: var(--doc-blue);
  color: var(--doc-blue);
  background-color: #eff6ff;
}

/* DIN Rail Visual Preview */
.rails-container {
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
}

.rail-box {
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: #f8fafc;
  padding: 0.85rem;
  transition: border-color 0.15s ease;
}

.rail-box.active-rail {
  border-color: var(--doc-blue);
  background-color: #f0f7ff;
}

.rail-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.65rem;
}

.rail-title {
  font-weight: 800;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.te-counter {
  font-size: 0.82rem;
  font-weight: 700;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  background-color: #e2e8f0;
  color: var(--text-main);
}

.te-counter.full {
  background-color: #dcfce7;
  color: var(--check-green);
}

.te-counter.over {
  background-color: #fee2e2;
  color: var(--brand-red);
}

.din-rail-track {
  position: relative;
  background: linear-gradient(180deg, #cbd5e1 0%, #e2e8f0 25%, #94a3b8 50%, #e2e8f0 75%, #cbd5e1 100%);
  border: 1px solid #64748b;
  border-radius: 6px;
  padding: 0.6rem;
  min-height: 118px;
  display: grid;
  gap: 3px;
  overflow-x: auto;
}

.din-module {
  background-color: #ffffff;
  border: 2px solid #334155;
  border-top-width: 7px;
  border-radius: 5px;
  padding: 0.35rem 0.4rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  cursor: pointer;
  min-height: 98px;
  transition: transform 0.1s ease, box-shadow 0.1s ease;
  overflow: hidden;
}

.din-module:hover {
  transform: translateY(-2px);
  box-shadow: 0 3px 8px rgba(15, 23, 42, 0.15);
}

.din-module.selected-module {
  outline: 3px solid var(--brand-red);
  outline-offset: 1px;
  background-color: #fff5f5;
}

.din-module[data-type="RCD"] { border-top-color: var(--doc-blue); }
.din-module[data-type="LS1P"] { border-top-color: #0f172a; }
.din-module[data-type="LS3P"] { border-top-color: var(--brand-red); }
.din-module[data-type="FILS"] { border-top-color: #0284c7; }
.din-module[data-type="AFDD"] { border-top-color: #d97706; }
.din-module[data-type="SPD"] { border-top-color: #dc2626; }
.din-module[data-type="HS"] { border-top-color: var(--check-green); }
.din-module[data-type="RES"] { border-top-color: #94a3b8; background-color: #f1f5f9; border-style: dashed; }

.mod-code {
  font-weight: 800;
  font-size: 0.82rem;
  color: var(--text-main);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.mod-te-tag {
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--text-muted);
  background: #f1f5f9;
  padding: 1px 4px;
  border-radius: 3px;
}

.mod-type {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mod-room {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--doc-blue);
  background-color: #eff6ff;
  padding: 2px 4px;
  border-radius: 4px;
  line-height: 1.2;
  word-break: break-word;
}

.din-empty-slot {
  border: 1px dashed #64748b;
  background-color: rgba(255, 255, 255, 0.45);
  border-radius: 4px;
  min-height: 98px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  color: #475569;
  font-weight: 600;
}

/* Table Legend */
.table-responsive {
  overflow-x: auto;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.legend-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  background-color: #ffffff;
}

.legend-table th,
.legend-table td {
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--border-color);
  text-align: left;
  vertical-align: middle;
}

.legend-table th {
  background-color: var(--bg-subtle);
  font-weight: 700;
  font-size: 0.82rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.legend-table tr.selected-row {
  background-color: #fff1f2;
}

.legend-table input {
  width: 100%;
  min-height: 44px;
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-size: 0.9rem;
}

.code-pill {
  display: inline-block;
  padding: 0.25rem 0.55rem;
  border-radius: 6px;
  font-weight: 800;
  font-size: 0.85rem;
  background-color: #eff6ff;
  color: var(--doc-blue);
  border: 1px solid #bfdbfe;
}

.status-banner {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  background-color: #eff6ff;
  border-left: 4px solid var(--doc-blue);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
  display: none;
}

.status-banner.show {
  display: block;
}

.app-footer {
  max-width: 1360px;
  margin: 2rem auto 0;
  padding: 1rem 1.25rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border-color);
}

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

.wg-subcard {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.9rem 1rem;
  background-color: #f8fafc;
}

.wg-subcard h3 {
  font-size: 0.96rem;
  font-weight: 700;
  color: var(--text-main);
}

@media (max-width: 768px) {
  .container {
    padding: 0 0.75rem;
  }
  .card {
    padding: 1rem;
  }
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
  }
  .header-actions {
    width: 100%;
  }
  .header-actions .btn {
    flex: 1 1 auto;
  }
}