:root {
  --green: #00ff00;
  --dark-green: #00dd00;
  --retro-bg: hsl(0, 0%, 18%);
  --retro-box: #1a1a1a;
  --retro-text: #333333;
  --retro-text-dim: #666666;
  --retro-border: #dddddd;
  --retro-highlight: #00ff00;
  --retro-input-bg: #ffffff;
  --retro-header: #00dd00;
  --memory-header-bg: #f8f9fa;
  --memory-header-text: #495057;
  --memory-cell-bg: #ffffff;
  --memory-cell-text: #000000;
  --memory-cell-hover: #e0e0e0;
  --memory-zero-bg: #d2d2d2;
  --memory-zero-text: #313131;
}

body {
  /*font-family: "Courier New", monospace; */
  font-family: "VT323", monospace;

  margin: 20px;
  background-color: var(--retro-bg);
  color: var(--retro-text);
}

button {
  font-size: 18px;
}

.controls {
  margin-bottom: 20px;
}

.controls button {
  background: var(--green);
  color: black;
  border: none;
  padding: 10px 20px;
  cursor: pointer;
  /* font-family: inherit; */
}

.controls button:hover {
  background: var(--dark-green);
}

.state-display {
  background: var(--retro-box);
  padding: 15px;
  margin-bottom: 20px;
  border: 1px solid var(--retro-border);
  max-width: 600px;
  margin-left: 0px;
  margin-right: 0;
}

.state-item {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 15px;
}

.state-item label {
  font-weight: bold;
  font-size: 16px;
  color: var(--retro-text);
  min-width: 30px;
}

.pc-controls {
  display: flex;
  align-items: center;
  gap: 5px;
}

.pc-controls button {
  background: var(--green);
  color: black;
  border: none;
  width: 30px;
  height: 30px;
  cursor: pointer;
  font-weight: bold;
}

.pc-controls button:hover {
  background: var(--dark-green);
}

.pc-controls input {
  width: 60px;
  height: 30px;
  text-align: center;
  border: 1px solid var(--retro-border);
  font-size: 14px;
  font-weight: bold;
  background: var(--retro-input-bg);
  color: var(--retro-text);
}

.top-container,
.container {
  display: flex;
  flex-direction: row;
  gap: 40px;
  margin-bottom: 20px;
  margin-left: 0;
  align-items: flex-start;
}

.main-grid {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  width: 100%;
}

.top-row,
.bottom-row {
  display: flex;
  flex-direction: row;
  gap: 0;
  width: 100%;
  justify-content: center;
}

.assembly-box,
.pc-box,
.grid-container {
  border: 2px solid var(--retro-border);
  padding: 8px 16px 16px 16px;
  margin: 0;
  box-sizing: border-box;
  max-width: 650px;
  width: 100%;
  background: var(--retro-box);
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
}

.assembly-box {
  flex: 1 1 0;
}

.pc-box {
  flex: 1 1 0;
  align-items: flex-start;
  justify-content: flex-start;
}

.pc-header {
  font-weight: bold;
  font-size: 16px;
  color: var(--retro-text);
  margin-bottom: 10px;
}

.assembly-input-wrapper {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  width: 100%;
  background: var(--retro-input-bg);
  border: 1px solid var(--retro-border);
  min-height: 150px;
  box-sizing: border-box;
}

.line-numbers {
  background: var(--retro-bg);
  color: var(--green);
  /* font-family: "Courier New", monospace; */
  font-size: 14px;
  padding: 10px 6px 10px 10px;
  text-align: right;
  user-select: none;
  border-right: 1px solid var(--retro-border);
  min-width: 32px;
  min-height: 150px;
  line-height: 1.4;
  overflow-y: hidden;
}

#assembly-input {
  width: 100%;
  min-width: 0;
  height: 150px;
  border: none;
  padding: 10px;
  font-size: 14px;
  line-height: 1.4;
  resize: vertical;
  box-sizing: border-box;
  background: transparent;
  outline: none;
  color: var(--retro-text);
}

#assembly-input:focus {
  border: none;
  box-shadow: none;
}

.grid-title {
  font-size: 22px;
  font-weight: bold;
  margin-bottom: 10px;
  color: var(--retro-header);
  text-align: center;
}

.grid-row {
  display: grid;
  grid-template-columns: 60px repeat(16, 1fr);
  gap: 2px;
}

.header-row {
  grid-template-columns: 60px repeat(16, 1fr);
  gap: 2px;
  margin-bottom: 14px;
}

.header-cell {
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: bold;
  color: var(--retro-bg);
  border: 1px solid #cccccc;
}

.header-row .header-cell:first-child {
  background: transparent;
  border: none;
}

.column-header {
  background: var(--memory-header-bg);
  color: var(--memory-header);
  justify-content: center;
}

.row-header {
  background: var(--memory-header-bg);
  color: var(--memory-header);
  justify-content: flex-start;
  padding-left: 8px;
}

.byte-cell {
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--memory-cell-bg);
  border: 1px solid #cccccc;
  font-size: 16px;
  font-weight: bold;
  color: var(--memory-cell-text);
}

.byte-cell:hover {
  background: var(--memory-cell-hover);
  color: var(--memory-cell-text);
  cursor: pointer;
}

.byte-cell.zero {
  background: var(--memory-zero-bg);
  color: var(--memory-zero-text);
}

.byte-cell.current-instruction {
  outline: 4px solid var(--retro-highlight);
  outline-offset: -4px;
  /*box-shadow: 0 0 10px 2px rgba(40, 167, 69, 0.4);*/
  z-index: 1;
}

.byte-cell.stack-pointer {
  outline: 4px solid var(--teal);
  outline-offset: -4px;
  z-index: 1;
}

/* Hide number input spinners */
input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

input[type="number"] {
  -moz-appearance: textfield;
}

.assembly-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
  margin-top: 20px;
}

.assembly-header label {
  font-weight: bold;
  font-size: 22px;
  color: var(--green);
}

.assembly-header button {
  background: var(--green);
  color: black;
  border: none;
  padding: 8px 16px;
  cursor: pointer;
  /* font-family: inherit; */
  font-weight: bold;
}

.assembly-header button:hover {
  background: var(--dark-green);
}

.byte-grid {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 8px;
}

.registers-visualization {
  display: flex;
  flex-direction: row;
  gap: 18px;
  margin-top: 32px;
  width: 100%;
  justify-content: center;
}

.register-display {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--retro-input-bg);
  border: 2px solid var(--retro-border);
  padding: 10px 0;
  min-width: 0;
  min-height: 70px;
  box-sizing: border-box;
  width: 100px;
  max-width: 120px;
}

.register-name {
  font-size: 1.3em;
  font-weight: bold;
  color: var(--retro-text-dim);
  min-width: 40px;
}

.register-value {
  font-size: 2.2em;
  font-weight: bold;
  color: var(--retro-text);
  letter-spacing: 2px;
}

.vm-controls {
  display: flex;
  flex-direction: row;
  gap: 12px;
  margin-top: 32px;
  align-items: center;
  width: 100%;
}

/* New: horizontal layout for main control buttons */
.vm-main-buttons {
  display: flex;
  flex-direction: row;
  gap: 12px;
  flex: 1;
}

.vm-main-buttons button {
  background: var(--green);
  color: black;
  border: none;
  padding: 8px 18px;
  cursor: pointer;
  font-weight: bold;
  margin-right: 0;
  flex: 1;
}

.vm-main-buttons button:hover {
  background: var(--dark-green);
}

.speed-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
}

#speed-input {
  width: 60px;
  text-align: center;
  font-size: 15px;
  border: 1px solid var(--retro-border);
  padding: 4px 6px;
  background: var(--retro-input-bg);
  color: var(--retro-text);
}

.speed-controls button {
  padding: 4px 12px;
  font-size: 18px;
  background: var(--green);
  color: black;
  border: none;
  cursor: pointer;
  flex: 1;
}

.speed-controls button:hover {
  background: var(--dark-green);
}

#display-toggle {
  background: var(--green);
  color: black;
  border: none;
  padding: 8px;
  cursor: pointer;
  font-size: 15px;
  font-weight: bold;
  flex: 1;
  font-family: "VT323", monospace !important;
}

#display-toggle:hover {
  background: var(--dark-green);
}

.assembly-controls {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 12px;
  margin-top: 12px;
  justify-content: flex-start;
  width: 100%;
}

.assembly-controls .speed-controls {
  margin: 0;
}

.assembly-controls #display-toggle {
  background: var(--green);
  color: white;
  border: none;
  padding: 8px 18px;
  cursor: pointer;
  font-size: 15px;
  font-weight: bold;
  flex: 1;
}

.assembly-controls #display-toggle:hover {
  background: var(--dark-green);
}

.top-row,
.bottom-row {
  justify-content: center;
}

@media (max-width: 1300px) {
  .top-row,
  .bottom-row {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
  }
  .grid-container,
  .assembly-box,
  .pc-box {
    max-width: 650px;
    width: 100%;
    min-width: 0;
    box-sizing: border-box;
    margin: 0 auto;
  }
}

.controls button,
.pc-controls button,
.assembly-header button,
.vm-main-buttons button,
.speed-controls button,
.assembly-controls #display-toggle {
  font-family: inherit;
}

h1 {
  font-size: 38px;
  text-align: center;
  margin-bottom: 24px;
  color: var(--retro-header);
}

.speed-controls label {
  color: var(--green);
}