:root {
  --bg: #0f0f0f;
  --surface: #1a1a1a;
  --border: #2a2a2a;
  --text: #e8e8e8;
  --muted: #888;
  --accent: #e85d04;
  --error: #c44;
  --success: #4a9;
  --grid: #333;
}

* { box-sizing: border-box; }

body {
  font-family: 'JetBrains Mono', 'SF Mono', 'Consolas', monospace;
  background: var(--bg);
  color: var(--text);
  margin: 0;
  padding: 1.5rem;
  min-height: 100vh;
}

h1 {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 1rem 0;
}

.header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.header h1 {
  margin: 0;
}

.header .back-link {
  font-size: 0.75rem;
  color: var(--muted);
  text-decoration: none;
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  transition: border-color 0.15s, color 0.15s;
}

.header .back-link:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.layout {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  max-width: 900px;
  margin: 0 auto;
}

.layout.wide { max-width: 1200px; }
.layout.extra-wide { max-width: 1600px; }

.side-by-side {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

@media (max-width: 1000px) {
  .side-by-side { grid-template-columns: 1fr; }
}

.layout-column {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.25rem;
}

.panel h2 {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 0.75rem 0;
}

.inputs {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 1rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.field label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* Base input/select styling - shared across all inputs */
input[type="text"],
input[type="number"],
select {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  font-family: inherit;
  font-size: 0.9rem;
  padding: 0.4rem 0.6rem;
}

input[type="text"]:focus,
input[type="number"]:focus,
select:focus {
  outline: none;
  border-color: var(--accent);
}

.field input, .field select {
  width: 100%;
  min-width: 90px;
  max-width: 160px;
}

/* Overridden state for inputs (e.g., when manual value differs from calculated) */
input.overridden {
  color: var(--muted);
  text-decoration: line-through;
}

/* Inline row of inputs with separators/units */
.inline-inputs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.inline-inputs input {
  width: 120px;
}

.inline-inputs .separator {
  color: var(--muted);
  font-size: 0.85rem;
}

.inline-inputs .unit {
  color: var(--muted);
  font-size: 0.8rem;
}

.field-wide select { max-width: 300px; }
.field-preset select { max-width: 320px; }

textarea {
  width: 100%;
  min-height: 100px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-family: inherit;
  font-size: 0.85rem;
  padding: 0.75rem;
  resize: vertical;
}

textarea::-webkit-scrollbar { width: 10px; height: 10px; }
textarea::-webkit-scrollbar-track { background: var(--bg); border-radius: 4px; }
textarea::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
textarea::-webkit-scrollbar-thumb:hover { background: var(--muted); }
textarea { scrollbar-color: var(--border) var(--bg); }
textarea::placeholder { color: var(--muted); }

textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.button-row {
  display: flex;
  gap: 0.75rem;
  margin-top: 0.75rem;
}

button {
  background: var(--accent);
  border: none;
  border-radius: 4px;
  color: var(--bg);
  font-family: inherit;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.5rem 1rem;
  cursor: pointer;
  transition: opacity 0.15s;
}

button:hover { opacity: 0.85; }
button:active { opacity: 0.7; }

button.secondary {
  background: var(--border);
  color: var(--text);
}

.hint {
  font-size: 0.7rem;
  color: var(--muted);
  margin-top: 0.5rem;
}

.error {
  font-size: 0.8rem;
  color: var(--error);
  margin-top: 0.5rem;
}

.chart-wrap {
  position: relative;
  height: 560px;
  margin-top: 0.5rem;
}
.chart-wrap.chart-map {
  height: 280px;
}

.chart-wrap canvas { display: block; }

/* Two-column chart row under a main chart (brake bias, etc.) */
.mapping-charts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1rem;
}
@media (max-width: 900px) {
  .mapping-charts {
    grid-template-columns: 1fr;
  }
}
.mapping-charts h3 {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0 0 0.35rem 0;
  font-weight: 600;
}

/* Multi-line metrics block (often below charts) */
.results-stack {
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}
.results-stack .result-group {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--border);
}
.results-stack .result-group:last-of-type {
  border-bottom: none;
  padding-bottom: 0;
}
.results-stack .result-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.65rem;
  align-items: baseline;
  line-height: 1.5;
}
.results-stack .result-sep {
  color: var(--muted);
  opacity: 0.45;
  user-select: none;
}
.results-stack .result-detail {
  opacity: 0.9;
}
.results-stack strong {
  color: var(--text);
  font-weight: 600;
}

/* Nested blocks inside a panel (e.g. Brakes vs Tire) */
.panel-subsection {
  margin-top: 1rem;
}
.panel-subsection:first-of-type {
  margin-top: 0;
}

/* Brake bias page: tighter numeric fields */
.layout-brake-bias .field input,
.layout-brake-bias .field select {
  max-width: 120px;
}

.layout-brake-bias #front-pad-select,
.layout-brake-bias #rear-pad-select {
  max-width: min(100%, 19rem);
  width: 100%;
}

.layout-brake-bias .field input:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.summary {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 1rem;
}

.summary strong { color: var(--text); }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

thead th {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  text-align: left;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border);
}

tbody td {
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

tbody tr:last-child td { border-bottom: none; }
tbody tr:hover { background: rgba(232, 93, 4, 0.05); }

.toggle-wrap {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  font-size: 0.8rem;
  color: var(--muted);
}

.toggle-wrap .checkbox-box {
  position: relative;
  width: 1.125rem;
  height: 1.125rem;
  flex-shrink: 0;
}

.toggle-wrap .checkbox-box input {
  position: absolute;
  inset: 0;
  margin: 0;
  opacity: 0;
  cursor: pointer;
  width: 100%;
  height: 100%;
}

.toggle-wrap .checkbox-box .checkmark {
  position: absolute;
  inset: 0;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  pointer-events: none;
  display: grid;
  place-content: center;
  font-size: 0.65rem;
  color: transparent;
}

.toggle-wrap .checkbox-box input:hover + .checkmark { border-color: var(--muted); }

.toggle-wrap .checkbox-box input:checked + .checkmark {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg);
}

/* File controls */
.file-controls {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  align-items: center;
}


/* Sections */
.section {
  margin-top: 1.5rem;
}

.section:first-child {
  margin-top: 0;
}

.section-title {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.75rem 0;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

/* Subsection headings (h3 within panels) */
.panel h3 {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 0.5rem 0;
}

/* Field grid */
.field-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1rem;
}

.field-grid .field input,
.field-grid .field select {
  max-width: none;
}

.field-grid .field input[type="text"] {
  width: 100%;
}

.field.wide {
  grid-column: span 2;
}

/* Corner/sub-panel grid */
.corner-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 800px) {
  .corner-grid { grid-template-columns: 1fr; }
}

.corner-panel {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1rem;
}

.corner-panel h4 {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 0.75rem 0;
}

/* Calculated values display */
.calculated {
  margin-top: 1rem;
  padding: 1rem;
  background: var(--bg);
  border-radius: 6px;
}

.calculated-title {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 0.5rem 0;
}

.calc-group {
  margin-bottom: 1rem;
}

.calc-group:last-child {
  margin-bottom: 0;
}

.calc-group-title {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 0.35rem 0;
}

.calculated-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.5rem;
}

.calc-item {
  font-size: 0.85rem;
}

.calc-item .label {
  color: var(--muted);
}

.calc-item .value {
  color: var(--text);
  font-weight: 600;
}

/* Read-only calculated fields */
.calculated-field {
  background: var(--surface) !important;
  color: var(--muted) !important;
  cursor: default;
}

/* Data row (gear, etc) */
.data-row {
  display: flex;
  gap: 0.75rem;
  align-items: flex-end;
  margin-bottom: 0.5rem;
  padding: 0.5rem;
  background: var(--bg);
  border-radius: 4px;
}

.data-row .field {
  flex: 1;
}

.data-row .field input {
  width: 100%;
}

/* Empty state */
.empty-state {
  text-align: center;
  padding: 3rem;
  color: var(--muted);
}

/* Notes content */
.notes-content {
  margin-top: 0.75rem;
}

.notes-content p {
  font-size: 0.85rem;
  color: var(--text);
  margin: 0 0 0.75rem 0;
  line-height: 1.5;
}

.notes-content code {
  background: var(--bg);
  padding: 0.15rem 0.4rem;
  border-radius: 3px;
  font-size: 0.8rem;
  color: var(--accent);
}

/* Output labels/values */
.output-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 0.5rem 0;
}

.output-value {
  font-size: 1rem;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 1rem;
}