:root {
  --bg-primary: #12151c;
  --bg-secondary: #1a1e28;
  --bg-card: #222736;
  --bg-hover: #2c3345;
  --border-color: #2f364a;
  --text-primary: #f0f3fa;
  --text-secondary: #9aa4bf;
  --text-muted: #64708d;
  --accent-color: #3b82f6;
  --accent-hover: #2563eb;
  --accent-light: rgba(59, 130, 246, 0.15);
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --purple: #8b5cf6;
  --font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Malgun Gothic", sans-serif;
}

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

body {
  font-family: var(--font-family);
  background: var(--bg-primary);
  color: var(--text-primary);
  height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* Header */
header {
  height: 60px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 14px;
  gap: 10px;
  z-index: 100;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.brand .logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 15px;
  color: white;
}

.brand h1 {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: -0.3px;
  color: var(--text-primary);
}

.badge {
  font-size: 10px;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 10px;
  background: var(--accent-light);
  color: var(--accent-color);
  border: 1px solid rgba(59, 130, 246, 0.3);
}

/* 3-Step Workflow Stepper */
.workflow-stepper {
  display: flex;
  align-items: center;
  gap: 4px;
  background: var(--bg-primary);
  padding: 4px 6px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.step-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 10px;
  border-radius: 6px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s ease;
  text-align: left;
}

.step-pill:hover {
  background: var(--bg-card);
  color: var(--text-primary);
}

.step-pill.active {
  background: rgba(59, 130, 246, 0.16);
  border-color: var(--accent-color);
  color: var(--text-primary);
}

.step-pill.active[data-step="3"] {
  background: rgba(16, 185, 129, 0.16);
  border-color: var(--success);
}

.step-num {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 800;
  color: var(--text-secondary);
}

.step-pill.active .step-num {
  background: var(--accent-color);
  border-color: var(--accent-color);
  color: white;
}

.step-pill.active[data-step="3"] .step-num {
  background: var(--success);
  border-color: var(--success);
  color: white;
}

.step-text {
  display: flex;
  flex-direction: column;
}

.step-title {
  font-size: 11px;
  font-weight: 700;
  line-height: 1.2;
}

.step-sub {
  font-size: 9px;
  color: var(--text-muted);
  margin-top: 1px;
}

.step-pill.active .step-sub {
  color: #93c5fd;
}

.step-pill.active[data-step="3"] .step-sub {
  color: #6ee7b7;
}

.step-arrow {
  color: var(--text-muted);
  font-size: 11px;
  padding: 0 2px;
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.btn {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: all 0.15s ease;
  font-family: inherit;
}

.btn:hover {
  background: var(--bg-hover);
  border-color: #434c66;
}

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

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

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

.btn-success:hover {
  background: #059669;
  border-color: #059669;
}

.btn-sm {
  padding: 4px 8px;
  font-size: 11px;
}

.segmented-control {
  display: flex;
  background: var(--bg-primary);
  padding: 2px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
}

.segmented-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 4px 8px;
  font-size: 11px;
  font-weight: 600;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s ease;
  font-family: inherit;
}

.segmented-btn.active {
  background: var(--bg-card);
  color: var(--text-primary);
  box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}

/* Layout */
.app-container {
  flex: 1;
  display: flex;
  overflow: hidden;
  position: relative;
}

/* Sidebars */
.sidebar {
  width: 340px;
  background: var(--bg-secondary);
  border-color: var(--border-color);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  z-index: 50;
  transition: width 0.2s ease;
}

.sidebar-left {
  border-right: 1px solid var(--border-color);
}

.sidebar-right {
  width: 360px;
  border-left: 1px solid var(--border-color);
  transition: width 0.2s ease;
}

/* Step 1 2-Split Mode (세로 2분할 50% / 50%) */
.app-container.step-1-mode .sidebar-left {
  width: 50% !important;
  max-width: 50% !important;
  flex: 0 0 50% !important;
  border-right: 1px solid var(--border-color);
}

.app-container.step-1-mode .viewport-container {
  width: 50% !important;
  max-width: 50% !important;
  flex: 0 0 50% !important;
}

.app-container.step-1-mode .sidebar-right {
  display: none !important;
}

/* Step 2 2-Split Mode (세로 2분할: 좌측 제원 패널 + 우측 3D 외형 뷰어) */
.app-container.step-2-mode .sidebar-left {
  width: 420px !important;
  max-width: 420px !important;
  flex: 0 0 420px !important;
  border-right: 1px solid var(--border-color);
}

.app-container.step-2-mode .viewport-container {
  flex: 1 1 auto !important;
  width: auto !important;
  max-width: none !important;
}

.app-container.step-2-mode .sidebar-right {
  display: none !important;
}

/* Step 3 2-Split Mode (세로 2분할: 좌측 구조물 선택 패널 + 우측 3D 모델 및 철근 기능) */
.app-container.step-3-mode .sidebar-left {
  width: 420px !important;
  max-width: 420px !important;
  flex: 0 0 420px !important;
  border-right: 1px solid var(--border-color);
}

.app-container.step-3-mode .viewport-container {
  flex: 1 1 auto !important;
  width: auto !important;
  max-width: none !important;
}

.app-container.step-3-mode .sidebar-right {
  display: none !important;
}

.app-container.step-3-mode #viewport-drawing-tabs,
.app-container.step-3-mode #header-mode-controls {
  display: none !important;
}

/* Step 3 Right HUD & Floating Cards */
.step3-right-hud {
  position: absolute;
  top: 12px;
  right: 12px;
  bottom: 52px;
  width: 320px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 60;
  pointer-events: none;
}

.step3-ctrl-card, .step3-rebar-detail-card {
  pointer-events: auto;
  background: rgba(18, 24, 38, 0.94);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  overflow: hidden;
  transition: all 0.25s ease;
  display: flex;
  flex-direction: column;
}

.step3-ctrl-card .card-header, .step3-rebar-detail-card .card-header {
  padding: 8px 12px;
  background: rgba(56, 189, 248, 0.08);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  font-weight: 700;
  user-select: none;
}

.step3-ctrl-card .card-body {
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 9px;
  max-height: 480px;
  overflow-y: auto;
}

.step3-rebar-detail-card .card-body {
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 440px;
  overflow-y: auto;
}

.ctrl-subgroup {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.ctrl-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  font-size: 11px;
}

.ctrl-label {
  font-size: 11px;
  color: var(--text-secondary);
  white-space: nowrap;
}

.ctrl-val {
  font-size: 10.5px;
  font-family: var(--font-mono, monospace);
  color: var(--accent-color);
  min-width: 32px;
  text-align: right;
}

.mini-slider {
  flex: 1;
  height: 4px;
  accent-color: var(--accent-color);
  cursor: pointer;
}

.dia-pill-group, .zone-pill-group {
  display: flex;
  gap: 5px;
  flex-wrap: wrap;
}

.dia-pill, .zone-pill {
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 11px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: all 0.15s ease;
}

.dia-pill.active, .zone-pill.active {
  background: rgba(56, 189, 248, 0.16);
  border-color: var(--accent-color);
  color: var(--text-primary);
  font-weight: 600;
}

.dia-pill .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c, #38bdf8);
}

.btn-close-sm {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 12px;
  padding: 1px 5px;
  border-radius: 4px;
}

.btn-close-sm:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.1);
}

.struct-card-step3 {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.struct-card-step3:hover {
  border-color: #475569;
  background: rgba(30, 41, 59, 0.6);
}

.struct-card-step3.selected {
  border-color: var(--accent-color);
  background: rgba(56, 189, 248, 0.08);
  box-shadow: 0 0 0 1px rgba(56, 189, 248, 0.5);
}

/* 1.2: 3D 구조물 선택 영역 날개벽 등 텍스트 크기 1.5배 확대 */
.struct-card-step3-title {
  font-size: 17.5px !important;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-primary);
  letter-spacing: -0.3px;
}

.struct-card-step3-tag {
  font-size: 11px;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: 4px;
}

.struct-card-step3-info {
  font-size: 11.5px;
  color: var(--text-secondary);
  margin-left: 20px;
  line-height: 1.4;
}

/* 2.2: 철근 선택 시 표시되는 철근 번호 텍스트 크기 1.5배 확대 */
#step3-detail-title {
  font-size: 18px !important;
  font-weight: 800 !important;
  color: var(--text-primary);
  letter-spacing: -0.3px;
}

#step3-detail-badge {
  font-size: 13.5px !important;
  font-weight: 700 !important;
  padding: 3px 8px !important;
}

/* Step 2 Clean Components */
.step2-header-simple {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
  background: rgba(56, 189, 248, 0.06);
}

.step2-header-simple h2 {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.step2-content-simple {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 0;
}

.step2-structures-scroll {
  display: flex;
  flex-direction: column;
  gap: 8px;
  overflow-y: auto;
}

/* Step 2 Structure Card */
.struct-card-step2 {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 9px 11px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.struct-card-step2:hover {
  border-color: #475569;
  background: rgba(30, 41, 59, 0.6);
}

.struct-card-step2.selected {
  border-color: var(--accent-color);
  background: rgba(56, 189, 248, 0.08);
  box-shadow: 0 0 0 1px rgba(56, 189, 248, 0.5);
}

.struct-card-step2-row1 {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}

.struct-card-step2-title {
  font-size: 12px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 6px;
}

.struct-card-step2-tag {
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-secondary);
}

.struct-card-step2-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px 8px;
  padding: 6px 8px;
  background: rgba(0, 0, 0, 0.2);
  border-radius: 4px;
  font-size: 11px;
}

.struct-card-step2-grid .item {
  display: flex;
  justify-content: space-between;
}

.struct-card-step2-grid .lbl {
  color: var(--text-muted);
  font-size: 10.5px;
}

.struct-card-step2-grid .val {
  color: var(--text-primary);
  font-weight: 600;
}

/* Step 1 Simple Clean Components */
.step1-header-simple {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
  background: rgba(59, 130, 246, 0.06);
}

.step1-header-simple h2 {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.step1-content-simple {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 0;
}

.upload-dropzone-simple {
  border: 2px dashed rgba(59, 130, 246, 0.35);
  border-radius: 8px;
  padding: 18px 12px;
  text-align: center;
  background: rgba(15, 23, 42, 0.5);
  cursor: pointer;
  transition: all 0.15s ease;
}

.upload-dropzone-simple:hover,
.upload-dropzone-simple.dragover {
  border-color: var(--accent-color);
  background: rgba(59, 130, 246, 0.12);
}

.step1-list-section {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
  margin-bottom: 0 !important;
}

.step1-drawings-scroll {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-right: 4px;
  min-height: 120px;
}

/* Simplified Drawing Card */
.dwg-card-simple {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.dwg-card-simple:hover {
  border-color: #64748b;
  background: var(--bg-hover);
}

.dwg-card-simple.selected {
  border-color: var(--accent-color);
  background: rgba(59, 130, 246, 0.08);
  box-shadow: 0 0 0 1px var(--accent-color);
}

.dwg-card-simple.unclassified {
  border-color: #f59e0b;
  background: rgba(245, 158, 11, 0.06);
}

.dwg-card-simple-row1 {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}

.dwg-card-simple-title {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
}

.dwg-card-btn-del {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 13px;
  cursor: pointer;
  padding: 2px 5px;
  border-radius: 4px;
  line-height: 1;
}

.dwg-card-btn-del:hover {
  background: rgba(239, 68, 68, 0.2);
  color: #ef4444;
}

.dwg-card-simple-row2 {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.dwg-card-simple-badge {
  font-size: 10px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 4px;
  white-space: nowrap;
}

.dwg-card-simple-badge.type-general {
  background: rgba(56, 189, 248, 0.18);
  color: #38bdf8;
  border: 1px solid rgba(56, 189, 248, 0.35);
}

.dwg-card-simple-badge.type-rebar {
  background: rgba(16, 185, 129, 0.18);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.35);
}

.dwg-card-simple-badge.type-unclassified {
  background: rgba(245, 158, 11, 0.22);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.5);
}

.dwg-card-type-toggle {
  display: flex;
  gap: 4px;
}

.type-toggle-btn {
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 10.5px;
  font-weight: 600;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.12s ease;
  font-family: inherit;
}

.type-toggle-btn:hover {
  border-color: #64748b;
  color: var(--text-primary);
}

.type-toggle-btn.active-gen {
  background: #0284c7;
  border-color: #38bdf8;
  color: white;
}

.type-toggle-btn.active-reb {
  background: #059669;
  border-color: #34d399;
  color: white;
}

/* Canvas Empty State Overlay */
.canvas-empty-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: #0b0d13;
  z-index: 10;
  pointer-events: none;
}

.empty-state-card {
  padding: 24px 16px;
  text-align: center;
  color: var(--text-muted);
  font-size: 11.5px;
  line-height: 1.6;
}

.step-sidebar-pane {
  display: none;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
}

.step-sidebar-pane.active {
  display: flex;
}

.step-scroll-body {
  flex: 1;
  overflow-y: auto;
  padding: 10px;
}

.sidebar-header-banner {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border-color);
  background: rgba(59, 130, 246, 0.08);
  border-left: 3px solid var(--accent-color);
}

.sidebar-header-banner.step2-banner {
  background: rgba(56, 189, 248, 0.08);
  border-left-color: #38bdf8;
}

.sidebar-header-banner.step3-banner {
  background: rgba(16, 185, 129, 0.08);
  border-left-color: var(--success);
}

.sidebar-tabs {
  display: flex;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
}

.tab-btn {
  flex: 1;
  padding: 9px 4px;
  font-size: 11px;
  font-weight: 600;
  text-align: center;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.15s ease;
  font-family: inherit;
}

.tab-btn.active {
  color: var(--accent-color);
  border-bottom-color: var(--accent-color);
  background: rgba(59, 130, 246, 0.05);
}

.tab-content {
  flex: 1;
  overflow-y: auto;
  padding: 10px;
  display: none;
}

.tab-content.active {
  display: block;
}

/* Upload Dropzone (Step 1.1) */
.upload-dropzone {
  border: 1.5px dashed #475569;
  border-radius: 8px;
  padding: 14px 10px;
  text-align: center;
  background: rgba(15, 23, 42, 0.55);
  cursor: pointer;
  transition: all 0.15s ease;
}

.upload-dropzone:hover, .upload-dropzone.dragover {
  border-color: var(--accent-color);
  background: rgba(59, 130, 246, 0.10);
}

/* Classification Summary Grid (Step 1.2) */
.classification-summary-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
  margin-bottom: 8px;
}

.class-stat-box {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 6px 8px;
  text-align: center;
}

.class-stat-box .count {
  font-size: 15px;
  font-weight: 800;
  display: block;
}

.class-stat-box .lbl {
  font-size: 10px;
  color: var(--text-secondary);
}

.mini-filter-tabs {
  display: flex;
  gap: 4px;
  background: var(--bg-primary);
  padding: 3px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
}

.mini-tab {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 10px;
  font-weight: 600;
  padding: 4px 4px;
  border-radius: 4px;
  cursor: pointer;
  font-family: inherit;
}

.mini-tab.active {
  background: var(--bg-card);
  color: var(--text-primary);
}

/* Drawing Classification Card (Step 1.2) */
.dwg-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 7px;
  padding: 9px 10px;
  margin-bottom: 7px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.dwg-card:hover {
  border-color: #475569;
  background: var(--bg-hover);
}

.dwg-card.selected {
  border-color: var(--accent-color);
  background: rgba(59, 130, 246, 0.10);
}

.dwg-card.unclassified {
  border-color: var(--warning);
  background: rgba(245, 158, 11, 0.08);
}

.dwg-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 6px;
  margin-bottom: 4px;
}

.dwg-card-title {
  font-size: 11.5px;
  font-weight: 700;
  color: var(--text-primary);
  word-break: break-all;
  line-height: 1.3;
}

.dwg-card-sub {
  font-size: 10px;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.dwg-type-badge {
  font-size: 9.5px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
  white-space: nowrap;
  flex-shrink: 0;
}

.dwg-type-badge.type-general {
  background: rgba(56, 189, 248, 0.18);
  color: #38bdf8;
  border: 1px solid rgba(56, 189, 248, 0.35);
}

.dwg-type-badge.type-rebar {
  background: rgba(16, 185, 129, 0.18);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.35);
}

.dwg-type-badge.type-unclassified {
  background: rgba(245, 158, 11, 0.22);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.5);
}

.dwg-card-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  margin-top: 6px;
  padding-top: 6px;
  border-top: 1px solid rgba(255,255,255,0.06);
}

.type-select-btns {
  display: flex;
  gap: 4px;
  flex: 1;
}

.type-btn {
  flex: 1;
  padding: 4px 6px;
  border-radius: 4px;
  font-size: 10px;
  font-weight: 700;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.12s ease;
  font-family: inherit;
}

.type-btn:hover {
  border-color: #64748b;
  color: var(--text-primary);
}

.type-btn.active-general {
  background: #0284c7;
  border-color: #38bdf8;
  color: white;
}

.type-btn.active-rebar {
  background: #059669;
  border-color: #34d399;
  color: white;
}

/* Cards & Sections */
.panel-section {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 11px;
  margin-bottom: 10px;
}

.panel-section h3 {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.meta-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  font-size: 11px;
}

.meta-item {
  background: var(--bg-primary);
  padding: 6px 8px;
  border-radius: 4px;
  border: 1px solid rgba(255,255,255,0.05);
}

.meta-item .label {
  color: var(--text-muted);
  display: block;
  margin-bottom: 2px;
  font-size: 10px;
}

.meta-item .value {
  color: var(--text-primary);
  font-weight: 600;
  word-break: break-word;
}

/* Layer list */
.layer-list {
  max-height: 210px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.layer-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 8px;
  border-radius: 4px;
  background: var(--bg-primary);
  font-size: 11px;
  cursor: pointer;
}

.layer-item:hover {
  background: var(--bg-hover);
}

.layer-color-dot {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  flex-shrink: 0;
}

.layer-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Structure & Rebar Mark items */
.struct-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 7px 9px;
  border-radius: 6px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  margin-bottom: 5px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.struct-item:hover {
  border-color: var(--accent-color);
  background: var(--bg-hover);
}

.struct-item.selected {
  border-color: var(--accent-color);
  background: var(--accent-light);
}

.struct-item-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.struct-item .name {
  font-size: 11.5px;
  font-weight: 600;
}

.struct-item .subtext {
  font-size: 10px;
  color: var(--text-muted);
}

/* Diagnostic items */
.diag-item {
  padding: 8px 10px;
  border-radius: 6px;
  background: var(--bg-primary);
  border-left: 3px solid var(--success);
  margin-bottom: 6px;
  font-size: 11px;
}

.diag-item.warning {
  border-left-color: var(--warning);
}

.diag-item.danger {
  border-left-color: var(--danger);
}

.diag-header {
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  margin-bottom: 2px;
}

.diag-detail {
  color: var(--text-secondary);
  font-size: 10px;
  line-height: 1.4;
}

/* Center Viewport */
.viewport-container {
  flex: 1;
  position: relative;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: #0b0d13;
}

.viewport-top-bar {
  min-height: 38px;
  background: #141822;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 10px;
  gap: 8px;
  z-index: 20;
}

.viewport-step-indicator {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}

.viewport-drawing-tabs {
  display: flex;
  align-items: center;
  gap: 4px;
  overflow-x: auto;
  padding-bottom: 1px;
}

.vp-dwg-tab {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 10.5px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: inherit;
}

.vp-dwg-tab:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.vp-dwg-tab.active {
  background: rgba(59, 130, 246, 0.2);
  border-color: var(--accent-color);
  color: white;
}

.viewport-panes-wrapper {
  flex: 1;
  display: flex;
  position: relative;
  overflow: hidden;
}

.view-pane {
  flex: 1;
  position: relative;
  height: 100%;
  overflow: hidden;
}

#viewport-3d {
  width: 100%;
  height: 100%;
}

#viewport-2d {
  width: 100%;
  height: 100%;
  background: #11141c;
}

.view-pane.split-active {
  flex: 1;
  border-right: 1px solid var(--border-color);
}

.viewport-overlay {
  position: absolute;
  top: 10px;
  left: 10px;
  pointer-events: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
  z-index: 10;
}

.overlay-chip {
  background: rgba(18, 21, 28, 0.88);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-color);
  padding: 5px 10px;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-secondary);
  pointer-events: auto;
}

.viewport-controls-bottom {
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  background: rgba(18, 21, 28, 0.88);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-color);
  padding: 4px 8px;
  border-radius: 20px;
  z-index: 10;
}

.view-hud-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 4px 8px;
  font-size: 11px;
  cursor: pointer;
  border-radius: 4px;
  font-family: inherit;
}

.view-hud-btn:hover, .view-hud-btn.active {
  color: white;
  background: var(--bg-hover);
}

/* Parameter controls in right sidebar */
.param-group {
  margin-bottom: 10px;
}

.param-header {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  margin-bottom: 4px;
}

.param-header label {
  color: var(--text-secondary);
}

.param-header .param-val {
  font-weight: 700;
  color: var(--accent-color);
}

.range-slider {
  width: 100%;
  accent-color: var(--accent-color);
  cursor: pointer;
}

/* Rebar Shape Diagram Box */
.rebar-shape-box {
  background: #0d1017;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 8px;
  margin: 8px 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* Modals & Dropdowns */
.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-menu {
  display: none;
  position: absolute;
  right: 0;
  top: 100%;
  margin-top: 4px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  min-width: 190px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.5);
  z-index: 200;
  padding: 4px;
}

.dropdown-menu.show {
  display: block;
}

.dropdown-item {
  padding: 8px 12px;
  font-size: 11px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  border-radius: 4px;
  text-decoration: none;
}

.dropdown-item:hover {
  background: var(--bg-hover);
}

/* BOM Modal */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(10, 13, 20, 0.82);
  backdrop-filter: blur(5px);
  z-index: 5000;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 24px;
}

.modal-card {
  width: min(1100px, 95vw);
  max-height: 88vh;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 16px 48px rgba(0,0,0,0.6);
}

.modal-header {
  padding: 14px 18px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-body {
  padding: 16px 18px;
  overflow-y: auto;
  flex: 1;
}

.bom-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 11.5px;
  margin-bottom: 16px;
}

.bom-table th, .bom-table td {
  border: 1px solid var(--border-color);
  padding: 6px 8px;
  text-align: center;
}

.bom-table th {
  background: var(--bg-card);
  color: var(--text-primary);
  font-weight: 700;
}

.bom-table tr:nth-child(even) {
  background: rgba(255,255,255,0.02);
}

.bom-table tr.subtotal-row {
  background: rgba(59, 130, 246, 0.12);
  font-weight: 700;
  color: #93c5fd;
}

.bom-table tr.total-row {
  background: rgba(16, 185, 129, 0.16);
  font-weight: 800;
  color: #6ee7b7;
}

/* Custom scrollbars */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: #4a5472;
}