* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

body {
  margin: 0;
  min-height: 100vh;
  
  background: #f3f4f6;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #374151;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding-top: 5vh;
}


#app {
  width: 100%;
  max-width: 850px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
  padding: 0 20px;
}


#control-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 24px;

  padding: 14px 28px;
  background: #ffffff;
  border-radius: 16px;
  
  box-shadow: 
    0 4px 6px -1px rgba(0, 0, 0, 0.05), 
    0 10px 15px -3px rgba(0, 0, 0, 0.03),
    inset 0 0 0 1px rgba(0,0,0,0.03);
}

.section {
  display: flex;
  align-items: center;
  gap: 10px;
  position: relative;
}


.section .title {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #6b7280;
  margin-right: 4px;
  min-width: 50px;
  text-align: right;
  transition: color 0.2s;
}


#mode-label {
  color: #2563eb; 
}


.toggle {
  position: relative;
  width: 48px;
  height: 26px;
  cursor: pointer;
}

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

.toggle .slider {
  position: absolute;
  inset: 0;
  background-color: #ef4444; 
  border-radius: 99px;
  transition: .3s cubic-bezier(0.4, 0.0, 0.2, 1);
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.06);
}

.toggle .slider:before {
  position: absolute;
  content: "";
  height: 20px;
  width: 20px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  border-radius: 50%;
  transition: .3s cubic-bezier(0.4, 0.0, 0.2, 1);
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}


.toggle input:checked + .slider {
  background-color: #2563eb;
}

.toggle input:checked + .slider:before {
  transform: translateX(22px);
}


select {
  appearance: none;
  background-color: #f9fafb;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 6px 32px 6px 12px;
  font-size: 13px;
  font-weight: 500;
  color: #374151;
  cursor: pointer;
  
  
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%236b7280'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
  background-size: 14px;
}

select:hover {
  border-color: #d1d5db;
  background-color: #f3f4f6;
}

select:focus {
  outline: none;
  border-color: #2563eb;
  box-shadow: 0 0 0 2px rgba(37,99,235,0.1);
}


.range-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}


.range-wrapper::after {
  content: "";
  position: absolute;
  left: 50%;
  top: -4px;
  bottom: -4px;
  width: 1px;
  background: #d1d5db;
  z-index: 0;
  pointer-events: none;
}

input[type=range] {
  width: 120px;
  height: 6px;
  background: #e5e7eb;
  border-radius: 3px;
  outline: none;
  z-index: 1; 
}

input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: white;
  border: 1px solid #d1d5db;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
  cursor: pointer;
  transition: transform 0.1s;
}

input[type=range]::-webkit-slider-thumb:hover {
  transform: scale(1.1);
  border-color: #9ca3af;
}


button {
  padding: 8px 16px;
  border-radius: 8px;
  border: 1px solid #e5e7eb;
  background: #ffffff;
  color: #374151;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

button:hover {
  background: #f9fafb;
  border-color: #d1d5db;
  transform: translateY(-1px);
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

button:active {
  transform: translateY(0);
}


button.danger {
  color: #dc2626;
  border-color: #fee2e2;
  background: #fef2f2;
}

button.danger:hover {
  background: #fee2e2;
  border-color: #fecaca;
}


#sim-container {
  position: relative;
  
 
  width: 640px;
  height: 380px;

  background: #000000;
  border-radius: 8px;
  border: 1px solid #000000;
  
  
  box-shadow: 
    0 20px 25px -5px rgba(0, 0, 0, 0.1), 
    0 10px 10px -5px rgba(0, 0, 0, 0.04),
    0 0 0 1px rgba(0,0,0,0.02); /* Crisp edge */
    
  overflow: hidden;
  cursor: crosshair;
}


canvas {
  display: block;
  width: 100%;
  height: 100%;
}


.grid-overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: transparent;
}


.footer-hint {
  margin-top: -10px;
  font-size: 12px;
  color: #9ca3af;
  text-align: center;
}


button {
  box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  font-weight: 600;
  letter-spacing: 0.01em;
}

button:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  border-color: #d1d5db;
}

button:active {
  transform: translateY(0);
  box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  background-color: #f3f4f6;
}


input[type=range] {
  height: 6px;
  background: #e5e7eb;
  border-radius: 8px;
  cursor: pointer;
  box-shadow: inset 0 1px 2px rgba(0,0,0,0.1);
}


.toggle .slider {
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.2); 
}
.toggle .slider::before {
  box-shadow: 0 2px 5px rgba(0,0,0,0.3); /
}