/* ===========================
   ENGINEERING GRAPHICS SIMULATOR
   CSS — Redesigned v2.0
   Alberto Felix & Aaron Mcgeo
   =========================== */

:root {
  /* Color System */
  --bg-app: #0f1117;
  --bg-header: #151820;
  --bg-sidebar: #f4f5f7;
  --bg-viewport: #e8ecf0;
  --bg-card: #ffffff;
  --bg-section: #f9fafb;

  --accent-primary: #2563eb;
  --accent-secondary: #10b981;
  --accent-warning: #f59e0b;
  --accent-danger: #ef4444;

  --text-primary: #111827;
  --text-secondary: #4b5563;
  --text-muted: #9ca3af;
  --text-on-dark: #e5e7eb;
  --text-on-dark-muted: #6b7280;

  --border-light: #e5e7eb;
  --border-medium: #d1d5db;
  --border-dark: #374151;

  --sidebar-width: 300px;
  --header-height: 52px;
  --footer-height: 28px;

  /* Typography */
  --font-mono: 'Space Mono', 'Courier New', monospace;
  --font-body: 'DM Sans', system-ui, sans-serif;

  /* Blueprint accent colors for axes */
  --axis-x: #ef4444;
  --axis-y: #22c55e;
  --axis-z: #3b82f6;
}

/* ===========================
   RESET & BASE
   =========================== */

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

html, body {
  height: 100%;
  overflow: hidden;
  font-family: var(--font-body);
  background: var(--bg-app);
  color: var(--text-primary);
  font-size: 13px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ===========================
   APP LAYOUT
   =========================== */

.app-container {
  width: 100vw;
  height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ===========================
   HEADER
   =========================== */

.header {
  height: var(--header-height);
  background: var(--bg-header);
  border-bottom: 1px solid var(--border-dark);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 18px;
  gap: 12px;
  flex-shrink: 0;
  z-index: 50;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
}

.logo-mark {
  width: 34px;
  height: 34px;
  background: var(--accent-primary);
  color: white;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  letter-spacing: 0.05em;
  flex-shrink: 0;
}

.title-block h1 {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--text-on-dark);
  letter-spacing: 0.02em;
  line-height: 1.2;
}

.title-block .subtitle {
  font-size: 10px;
  color: var(--text-on-dark-muted);
  font-family: var(--font-body);
  letter-spacing: 0.03em;
}

.header-center {
  flex: 1;
  display: flex;
  justify-content: center;
}

/* View mode switcher */
.view-mode-switcher {
  display: flex;
  background: rgba(255,255,255,0.07);
  border: 1px solid var(--border-dark);
  border-radius: 8px;
  padding: 3px;
  gap: 2px;
}

.mode-btn {
  padding: 5px 14px;
  background: transparent;
  border: none;
  border-radius: 5px;
  color: var(--text-on-dark-muted);
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}

.mode-btn:hover {
  color: var(--text-on-dark);
  background: rgba(255,255,255,0.08);
}

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

.mode-icon {
  font-size: 13px;
}

.header-right {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 16px;
}

.export-btn {
  padding: 6px 14px;
  background: transparent;
  border: 1px solid var(--border-dark);
  border-radius: 6px;
  color: var(--text-on-dark-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

.export-btn:hover {
  border-color: var(--accent-secondary);
  color: var(--accent-secondary);
}

.credits-block {
  text-align: right;
}

.credits-names {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-on-dark);
  font-weight: 700;
}

.credits-class {
  font-size: 10px;
  color: var(--text-on-dark-muted);
}

/* ===========================
   MAIN LAYOUT
   =========================== */

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

/* ===========================
   SIDEBAR
   =========================== */

.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-light);
  overflow-y: auto;
  overflow-x: hidden;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.sidebar::-webkit-scrollbar {
  width: 4px;
}
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb {
  background: var(--border-medium);
  border-radius: 4px;
}

/* Panel Sections */
.panel-section {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-light);
  background: var(--bg-card);
}

.panel-section:last-child { border-bottom: none; }

.section-label {
  font-family: var(--font-mono);
  font-size: 9.5px;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.12em;
  margin-bottom: 10px;
}

/* Solid type grid */
.solid-type-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
}

.solid-type-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 8px 4px;
  background: var(--bg-section);
  border: 1.5px solid var(--border-light);
  border-radius: 8px;
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all 0.15s;
}

.solid-type-btn:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  background: #eff6ff;
}

.solid-type-btn.active {
  border-color: var(--accent-primary);
  background: #eff6ff;
  color: var(--accent-primary);
  font-weight: 600;
}

.solid-icon {
  font-size: 16px;
  line-height: 1;
}

/* Polygon buttons */
.polygon-btns {
  display: flex;
  gap: 6px;
}

.poly-btn {
  flex: 1;
  padding: 8px 4px;
  background: var(--bg-section);
  border: 1.5px solid var(--border-light);
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
  line-height: 1.3;
  text-align: center;
  color: var(--text-secondary);
  transition: all 0.15s;
}

.poly-btn small {
  display: block;
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--text-muted);
}

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

.poly-btn.active {
  border-color: var(--accent-primary);
  background: #eff6ff;
  color: var(--accent-primary);
}

/* Dimension rows */
.dim-row {
  margin-bottom: 10px;
}

.dim-row:last-child { margin-bottom: 0; }

.dim-row label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.unit {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-muted);
  font-weight: 400;
}

.dim-control {
  display: flex;
  gap: 8px;
  align-items: center;
}

.dim-control input[type="range"] {
  flex: 1;
  height: 3px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--border-medium);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

.dim-control input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  background: var(--accent-primary);
  border-radius: 50%;
  border: 2px solid white;
  box-shadow: 0 1px 4px rgba(37,99,235,0.4);
  cursor: pointer;
}

.dim-control input[type="number"] {
  width: 52px;
  padding: 4px 6px;
  border: 1px solid var(--border-medium);
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  text-align: center;
  color: var(--text-primary);
  background: var(--bg-card);
  outline: none;
  transition: border-color 0.15s;
}

.dim-control input[type="number"]:focus {
  border-color: var(--accent-primary);
}

/* Toggle rows */
.toggle-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
}

.toggle-row:last-child { margin-bottom: 0; }

.toggle-label {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  flex: 1;
}

.label-hint {
  display: block;
  font-size: 10px;
  color: var(--text-muted);
  font-weight: 400;
  margin-top: 1px;
}

/* Custom toggle switch */
.toggle {
  position: relative;
  flex-shrink: 0;
}

.toggle input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-track {
  display: block;
  width: 34px;
  height: 18px;
  background: var(--border-medium);
  border-radius: 9px;
  position: relative;
  cursor: pointer;
  transition: background 0.2s;
}

.toggle-track::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 14px;
  height: 14px;
  background: white;
  border-radius: 50%;
  transition: transform 0.2s;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.toggle input:checked ~ .toggle-track {
  background: var(--accent-primary);
}

.toggle input:checked ~ .toggle-track::after {
  transform: translateX(16px);
}

/* Cut button */
.cut-btn {
  width: 100%;
  padding: 9px;
  margin-top: 8px;
  background: var(--accent-warning);
  border: none;
  border-radius: 8px;
  color: white;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s;
  letter-spacing: 0.04em;
}

.cut-btn:hover {
  background: #d97706;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.35);
}

.reset-cut-btn {
  width: 100%;
  padding: 7px;
  margin-top: 6px;
  background: transparent;
  border: 1px solid var(--border-medium);
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s;
}

.reset-cut-btn:hover {
  border-color: var(--accent-danger);
  color: var(--accent-danger);
}

/* Quick view grid */
.quick-view-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  margin-bottom: 8px;
}

.qv-btn {
  padding: 8px;
  background: var(--bg-section);
  border: 1px solid var(--border-light);
  border-radius: 6px;
  font-size: 11px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s;
  text-align: center;
}

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

.reset-view-btn {
  width: 100%;
  padding: 7px;
  background: transparent;
  border: 1px solid var(--border-light);
  border-radius: 6px;
  font-size: 11px;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.15s;
}

.reset-view-btn:hover {
  color: var(--accent-secondary);
  border-color: var(--accent-secondary);
}

/* Educational card */
.edu-card {
  margin: 0 16px 16px;
  background: #0f1117;
  border-radius: 10px;
  padding: 12px 14px;
  color: var(--text-on-dark);
  border: 1px solid #1f2937;
}

.edu-card-title {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  color: var(--accent-secondary);
  margin-bottom: 8px;
  letter-spacing: 0.08em;
}

.edu-card-body {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.axis-row {
  font-size: 11px;
  color: #9ca3af;
  display: flex;
  align-items: center;
  gap: 8px;
}

.axis-x { color: var(--axis-x); font-family: var(--font-mono); font-size: 10px; font-weight: 700; width: 45px; }
.axis-y { color: var(--axis-y); font-family: var(--font-mono); font-size: 10px; font-weight: 700; width: 45px; }
.axis-z { color: var(--axis-z); font-family: var(--font-mono); font-size: 10px; font-weight: 700; width: 45px; }

.scale-note {
  margin-top: 4px;
  padding-top: 6px;
  border-top: 1px solid #1f2937;
  color: var(--text-on-dark-muted);
}

.scale-note strong {
  color: var(--accent-warning);
  font-family: var(--font-mono);
  font-size: 12px;
}

/* ===========================
   VIEWPORT AREA
   =========================== */

.viewport-area {
  flex: 1;
  position: relative;
  background: var(--bg-viewport);
  overflow: hidden;
  display: flex;
}

/* Single viewport */
.viewport-single {
  width: 100%;
  height: 100%;
  position: relative;
}

#canvas {
  width: 100%;
  height: 100%;
  display: block;
  cursor: grab;
}

#canvas:active { cursor: grabbing; }

.viewport-label {
  position: absolute;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: rgba(0,0,0,0.2);
  pointer-events: none;
}

/* Info overlay chips */
.info-overlay {
  position: absolute;
  top: 12px;
  left: 12px;
  display: flex;
  flex-direction: column;
  gap: 5px;
  pointer-events: none;
}

.info-chip {
  background: rgba(15,17,23,0.85);
  color: #e5e7eb;
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 4px 10px;
  border-radius: 5px;
  border-left: 2px solid var(--accent-primary);
  backdrop-filter: blur(6px);
}

.controls-hint {
  position: absolute;
  bottom: 12px;
  left: 12px;
  background: rgba(15,17,23,0.65);
  color: #9ca3af;
  font-family: var(--font-mono);
  font-size: 9px;
  padding: 4px 10px;
  border-radius: 20px;
  pointer-events: none;
  backdrop-filter: blur(6px);
}

/* Split 4-view layout */
.viewport-split {
  width: 100%;
  height: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 2px;
  background: var(--border-dark);
}

.split-cell {
  position: relative;
  background: var(--bg-viewport);
  overflow: hidden;
}

.split-cell canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.split-label {
  position: absolute;
  top: 8px;
  left: 10px;
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: rgba(0,0,0,0.3);
  pointer-events: none;
}

/* Legend */
.legend-panel {
  position: absolute;
  bottom: 12px;
  right: 12px;
  background: rgba(15,17,23,0.88);
  border-radius: 10px;
  padding: 10px 12px;
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.07);
  pointer-events: none;
  min-width: 150px;
}

.legend-title {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 700;
  color: var(--accent-warning);
  letter-spacing: 0.12em;
  margin-bottom: 7px;
  padding-bottom: 6px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 10px;
  color: #9ca3af;
  margin-bottom: 4px;
  font-family: var(--font-body);
}

.legend-item:last-child { margin-bottom: 0; }

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

/* ===========================
   FOOTER
   =========================== */

.footer {
  height: var(--footer-height);
  background: var(--bg-header);
  border-top: 1px solid var(--border-dark);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 18px;
  font-size: 10px;
  color: var(--text-on-dark-muted);
  font-family: var(--font-body);
  flex-shrink: 0;
}

/* ===========================
   UTILITY CLASSES
   =========================== */

.hidden { display: none !important; }

/* Dimension annotation labels (CSS2D) */
.dim-label {
  background: rgba(37, 99, 235, 0.9);
  color: white;
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 4px;
  pointer-events: none;
  white-space: nowrap;
  box-shadow: 0 2px 6px rgba(37,99,235,0.4);
}

/* ===========================
   ANIMATIONS
   =========================== */

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.panel-section {
  animation: fadeIn 0.2s ease both;
}

/* Responsive adjustments */
@media (max-width: 900px) {
  :root { --sidebar-width: 260px; }
  .header-center { display: none; }
}

/* Back button to launcher */
.back-btn {
  padding: 5px 10px;
  background: rgba(255,255,255,0.08);
  border: 1px solid var(--border-dark);
  border-radius: 6px;
  color: var(--text-on-dark-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  text-decoration: none;
  transition: all 0.15s;
  white-space: nowrap;
}
.back-btn:hover {
  background: rgba(255,255,255,0.15);
  color: var(--text-on-dark);
}