:root {
  color-scheme: dark;

  --bg: #0b0f17;
  --bg-2: #111827;
  --bg-glow: rgba(96, 165, 250, 0.18);

  --panel: rgba(22, 27, 34, 0.94);
  --panel-solid: #161b22;
  --panel-2: #1f2937;
  --panel-3: #111827;

  --border: #2d3748;
  --border-strong: #475569;

  --text: #f8fafc;
  --muted: #a6b0c3;
  --muted-2: #7b8496;

  --accent: #60a5fa;
  --accent-soft: rgba(96, 165, 250, 0.16);

  --success: #22c55e;
  --warning: #f59e0b;

  --input-bg: #0b1020;
  --input-border: #374151;

  --chart-grid: #273244;
  --chart-text: #cbd5e1;
  --chart-muted: #94a3b8;
  --tooltip-bg: #111827;
  --tooltip-border: #374151;

  --torque-color: #60a5fa;
  --power-color: #22c55e;
  --selected-ring: #ffffff;

  --shadow: 0 28px 90px rgba(0, 0, 0, 0.38);
  --radius-lg: 26px;
  --radius-md: 18px;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    color-scheme: light;

    --bg: #eef2f7;
    --bg-2: #f8fafc;
    --bg-glow: rgba(37, 99, 235, 0.14);

    --panel: rgba(255, 255, 255, 0.92);
    --panel-solid: #ffffff;
    --panel-2: #f1f5f9;
    --panel-3: #f8fafc;

    --border: #d8dee9;
    --border-strong: #cbd5e1;

    --text: #111827;
    --muted: #4b5563;
    --muted-2: #64748b;

    --accent: #2563eb;
    --accent-soft: rgba(37, 99, 235, 0.12);

    --success: #16a34a;
    --warning: #d97706;

    --input-bg: #f8fafc;
    --input-border: #cbd5e1;

    --chart-grid: #e2e8f0;
    --chart-text: #1f2937;
    --chart-muted: #64748b;
    --tooltip-bg: #ffffff;
    --tooltip-border: #cbd5e1;

    --torque-color: #2563eb;
    --power-color: #16a34a;
    --selected-ring: #0f172a;

    --shadow: 0 28px 90px rgba(15, 23, 42, 0.12);
  }
}

html[data-theme='light'] {
  color-scheme: light;

  --bg: #eef2f7;
  --bg-2: #f8fafc;
  --bg-glow: rgba(37, 99, 235, 0.14);

  --panel: rgba(255, 255, 255, 0.92);
  --panel-solid: #ffffff;
  --panel-2: #f1f5f9;
  --panel-3: #f8fafc;

  --border: #d8dee9;
  --border-strong: #cbd5e1;

  --text: #111827;
  --muted: #4b5563;
  --muted-2: #64748b;

  --accent: #2563eb;
  --accent-soft: rgba(37, 99, 235, 0.12);

  --success: #16a34a;
  --warning: #d97706;

  --input-bg: #f8fafc;
  --input-border: #cbd5e1;

  --chart-grid: #e2e8f0;
  --chart-text: #1f2937;
  --chart-muted: #64748b;
  --tooltip-bg: #ffffff;
  --tooltip-border: #cbd5e1;

  --torque-color: #2563eb;
  --power-color: #16a34a;
  --selected-ring: #0f172a;

  --shadow: 0 28px 90px rgba(15, 23, 42, 0.12);
}

html[data-theme='dark'] {
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
  margin: 0;
}

body {
  font-family:
    Inter,
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, var(--bg-glow), transparent 34rem),
    radial-gradient(circle at top right, color-mix(in srgb, var(--success) 10%, transparent), transparent 32rem),
    linear-gradient(135deg, var(--bg), var(--bg-2));
}

.app-shell {
  width: min(1640px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 24px 0;
}

.app-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 20px;
}

.title-block {
  max-width: 780px;
}

.eyebrow {
  color: var(--accent);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: 7px;
}

h1,
h2,
h3,
p {
  margin: 0;
}

h1 {
  font-size: clamp(30px, 3.2vw, 48px);
  line-height: 0.98;
  letter-spacing: -0.055em;
}

h2 {
  font-size: 18px;
  letter-spacing: -0.025em;
}

h3 {
  font-size: 13px;
  margin-bottom: 8px;
}

p {
  color: var(--muted);
  margin-top: 5px;
  line-height: 1.45;
}

.top-actions,
.panel-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.theme-toggle,
.file-button,
.copy-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  border: 1px solid var(--border);
  background: linear-gradient(180deg, var(--panel-2), var(--panel-3));
  color: var(--text);
  border-radius: 999px;
  padding: 9px 14px;
  font-size: 12px;
  font-weight: 900;
  cursor: pointer;
  white-space: nowrap;
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.12);
}

.copy-button {
  background: linear-gradient(180deg, color-mix(in srgb, var(--accent) 22%, var(--panel-2)), var(--panel-3));
}

.theme-toggle:hover,
.file-button:hover,
.copy-button:hover {
  border-color: color-mix(in srgb, var(--accent) 70%, var(--border));
  background: color-mix(in srgb, var(--accent) 14%, var(--panel-2));
}

.theme-toggle:focus-visible,
.file-button:focus-visible,
.copy-button:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 45%, transparent);
  outline-offset: 3px;
}

.app-grid {
  display: grid;
  grid-template-columns: minmax(360px, 500px) minmax(560px, 1fr);
  grid-template-areas:
    "input graph"
    "output graph"
    "help graph";
  gap: 20px;
  align-items: start;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
  backdrop-filter: blur(12px);
}

.input-panel,
.graph-panel,
.output-panel,
.help-panel {
  padding: 18px;
}

.input-panel {
  grid-area: input;
}

.graph-panel {
  grid-area: graph;
}

.output-panel {
  grid-area: output;
}

.help-panel {
  grid-area: help;
}

.panel-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.graph-header {
  align-items: flex-start;
}

.graph-toolbar {
  display: grid;
  justify-items: end;
  gap: 10px;
}

.unit-controls {
  display: flex;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 8px;
}

.input-settings-card {
  display: grid;
  gap: 8px;
  margin-bottom: 12px;
  padding: 13px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--panel-2) 84%, transparent);
}

.input-settings-card p {
  font-size: 12px;
}

.mini-control,
.control-field {
  display: grid;
  gap: 5px;
}

.mini-control span,
.control-field span {
  color: var(--muted);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

select {
  width: 100%;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  border-radius: 999px;
  min-height: 34px;
  padding: 6px 30px 6px 11px;
  font-size: 12px;
  font-weight: 800;
}

.textarea-wrap {
  position: relative;
}

.textarea-wrap::before {
  content: "RPM | Torque";
  position: absolute;
  top: 10px;
  right: 12px;
  z-index: 1;
  pointer-events: none;
  color: var(--muted-2);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

textarea {
  width: 100%;
  height: clamp(190px, 31vh, 340px);
  resize: vertical;
  border: 1px solid var(--input-border);
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--input-bg) 88%, transparent), var(--input-bg)),
    var(--input-bg);
  color: var(--text);
  border-radius: var(--radius-md);
  padding: 34px 14px 14px;
  font-size: 13px;
  line-height: 1.55;
  font-family:
    "JetBrains Mono",
    "Cascadia Code",
    Consolas,
    monospace;
  outline: none;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.035);
}

textarea:focus {
  border-color: var(--accent);
  box-shadow:
    0 0 0 4px var(--accent-soft),
    inset 0 1px 0 rgba(255, 255, 255, 0.035);
}

.status-stack {
  display: grid;
  gap: 4px;
  margin: 10px 0 0;
}

.status-line {
  min-height: 18px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.4;
}

.status-line.has-warning {
  color: var(--warning);
}

.import-status:not(:empty),
.output-status:not(:empty) {
  color: var(--success);
}

.import-status.has-warning,
.output-status.has-warning {
  color: var(--warning);
}

.control-grid {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 10px;
  align-items: end;
}

.output-control-grid {
  grid-template-columns: minmax(0, 1.6fr) minmax(130px, 0.7fr) auto;
}

.help-grid {
  display: grid;
  gap: 12px;
}

.help-card {
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--panel-2) 88%, transparent), var(--panel-2));
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px;
}

.help-card p {
  font-size: 12px;
  margin-bottom: 10px;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.chip {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px 10px;
  background: var(--panel-solid);
  color: var(--text);
  font-size: 12px;
  font-weight: 900;
}

.shortcut-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px 12px;
  font-size: 12px;
}

.shortcut-grid span {
  color: var(--muted);
}

.shortcut-grid b {
  color: var(--text);
  font-weight: 900;
}

.selected-point {
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--muted);
  border-radius: 999px;
  padding: 9px 13px;
  font-size: 12px;
  font-weight: 900;
  white-space: nowrap;
}

.selected-point.is-active {
  color: var(--text);
  border-color: color-mix(in srgb, var(--accent) 70%, var(--border));
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--accent) 18%, var(--panel-2)), var(--panel-2));
}

.chart-frame {
  border: 1px solid var(--border);
  border-radius: 20px;
  overflow: hidden;
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--panel-2) 70%, transparent), transparent),
    var(--panel-solid);
}

#result-torque {
  height: clamp(410px, calc(100vh - 210px), 760px);
  min-height: 410px;
}

.highcharts-background {
  fill: transparent !important;
}

.highcharts-container {
  outline: none;
}

.highcharts-container:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 45%, transparent);
  outline-offset: -3px;
}

.highcharts-grid-line {
  stroke: var(--chart-grid) !important;
}

.highcharts-axis-line,
.highcharts-tick {
  stroke: var(--chart-grid) !important;
}

.highcharts-axis-labels text,
.highcharts-axis-title,
.highcharts-legend-item text,
.highcharts-title {
  fill: var(--chart-muted) !important;
  color: var(--chart-muted) !important;
}

.highcharts-legend-item text {
  fill: var(--chart-text) !important;
  color: var(--chart-text) !important;
  font-weight: 800 !important;
}

.highcharts-series-0 .highcharts-graph {
  stroke: var(--torque-color) !important;
}

.highcharts-series-0 .highcharts-point {
  fill: var(--torque-color) !important;
}

.highcharts-series-1 .highcharts-graph {
  stroke: var(--power-color) !important;
}

.highcharts-tooltip-box {
  fill: var(--tooltip-bg) !important;
  stroke: var(--tooltip-border) !important;
}

.highcharts-tooltip text {
  fill: var(--chart-text) !important;
  color: var(--chart-text) !important;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

@media (max-width: 1120px) {
  .app-grid {
    grid-template-columns: 1fr;
    grid-template-areas:
      "input"
      "graph"
      "output"
      "help";
  }

  .app-header {
    flex-direction: column;
  }

  .top-actions {
    align-self: stretch;
  }

  .theme-toggle {
    width: 100%;
  }

  .graph-toolbar {
    justify-items: stretch;
  }

  .unit-controls {
    justify-content: flex-start;
  }

  #result-torque {
    height: clamp(390px, 58vh, 640px);
  }
}

@media (max-width: 760px) {
  .control-grid,
  .output-control-grid {
    grid-template-columns: 1fr;
  }

  .copy-button {
    width: 100%;
  }
}

@media (max-width: 560px) {
  .app-shell {
    width: min(100vw - 16px, 1640px);
    padding: 8px 0;
  }

  .input-panel,
  .graph-panel,
  .output-panel,
  .help-panel {
    padding: 12px;
    border-radius: 18px;
  }

  .panel-header,
  .graph-header {
    flex-direction: column;
    align-items: stretch;
  }

  .panel-actions {
    align-self: stretch;
  }

  .file-button {
    width: 100%;
  }

  .selected-point {
    white-space: normal;
    border-radius: 14px;
  }

  .unit-controls {
    display: grid;
    grid-template-columns: 1fr;
  }

  #result-torque {
    height: 430px;
  }
}