/* ==========================================================================
   Pipeflow WASM — engineering console
   Dark instrument-panel aesthetic: blueprint-dark surfaces, amber console
   accent, tabular numerals for all readouts. No external assets.
   ========================================================================== */

:root {
  /* surfaces — tinted neutrals, never pure black/white */
  --bg:          #0b0e13;
  --bg-raised:   #11151d;
  --bg-inset:    #080a0f;
  --line:        #232a36;
  --line-strong: #333d4d;

  /* text */
  --ink:         #dbe2ec;
  --ink-dim:     #8b96a6;
  --ink-faint:   #5c6774;

  /* accents */
  --amber:       #f0a832;
  --amber-ink:   #1a1206;
  --amber-dim:   #8a6420;
  --steel:       #5fa8c9;
  --steel-dim:   #35586b;
  --alarm:       #e0654f;

  /* legend swatches */
  --sw-fast:     #f0a832;
  --sw-slow:     #2b4d6e;
  --sw-wall:     #e0654f;
  --sw-fixed:    #e0654f;
  --sw-load:     #f0a832;
  --sw-stress:   #5fa8c9;

  /* type */
  --font-ui:  "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;

  /* spacing scale (4px base) */
  --s1: 0.25rem;
  --s2: 0.5rem;
  --s3: 0.75rem;
  --s4: 1rem;
  --s5: 1.5rem;
  --s6: 2rem;

  --radius: 4px;
  --radius-lg: 8px;

  --focus-ring: 0 0 0 2px var(--bg), 0 0 0 4px var(--amber);
}

/* ---------------------------------------------------------------- reset */

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

html { color-scheme: dark; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(transparent 23px, rgba(95, 168, 201, 0.045) 24px),
    linear-gradient(90deg, transparent 23px, rgba(95, 168, 201, 0.045) 24px),
    var(--bg);
  background-size: 24px 24px, 24px 24px, auto;
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 0.9375rem;
  line-height: 1.5;
}

h1, p, dl, dd { margin: 0; }

button { font: inherit; color: inherit; cursor: pointer; }

:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: var(--radius);
}

/* ------------------------------------------------------------- header */

.console-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--s3) var(--s5);
  padding: var(--s4) var(--s5);
  border-bottom: 1px solid var(--line-strong);
  background: var(--bg-raised);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--s3);
  min-width: 0;
}

.brand-mark {
  color: var(--amber);
  font-size: 1.5rem;
  letter-spacing: -0.28em;
  transform: skewX(-8deg);
  user-select: none;
}

.brand-text h1 {
  font-family: var(--font-mono);
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.brand-accent { color: var(--amber); }

.brand-sub {
  font-size: 0.75rem;
  color: var(--ink-dim);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.header-cluster {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--s3) var(--s5);
}

.status-pill {
  padding: var(--s1) var(--s3);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: var(--bg-inset);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-dim);
  white-space: nowrap;
}

/* engine toggle */

.engine-toggle {
  display: flex;
  align-items: center;
  gap: var(--s2);
}

.toggle-label {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.toggle-btn {
  display: inline-flex;
  align-items: baseline;
  gap: var(--s2);
  padding: var(--s1) var(--s3);
  border: 1px solid var(--line-strong);
  background: var(--bg-inset);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--ink-dim);
  transition: border-color 120ms ease-out, color 120ms ease-out, background-color 120ms ease-out;
}

.toggle-btn:first-of-type { border-radius: var(--radius) 0 0 var(--radius); }
.toggle-btn:last-of-type  { border-radius: 0 var(--radius) var(--radius) 0; margin-left: calc(-1 * var(--s2)); }

.toggle-btn:hover { border-color: var(--steel-dim); color: var(--ink); }

.toggle-btn[aria-pressed="true"] {
  background: var(--amber);
  border-color: var(--amber);
  color: var(--amber-ink);
}

.toggle-tag {
  font-size: 0.625rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  opacity: 0.75;
}

/* perf readouts */

.perf-readouts {
  display: flex;
  gap: var(--s4);
}

.readout { text-align: right; }

.readout dt {
  font-size: 0.625rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.readout dd {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--amber);
  line-height: 1.2;
}

.readout:last-child dd { color: var(--steel); }

/* ---------------------------------------------------------------- tabs */

.mode-tabs {
  padding: var(--s3) var(--s5) 0;
  background: var(--bg-raised);
  border-bottom: 1px solid var(--line-strong);
}

.tab-list {
  display: flex;
  gap: var(--s2);
  max-width: 72rem;
  margin: 0 auto;
}

.tab {
  display: inline-flex;
  align-items: baseline;
  gap: var(--s2);
  padding: var(--s2) var(--s4);
  border: 1px solid transparent;
  border-bottom: none;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  background: transparent;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--ink-dim);
  transition: color 120ms ease-out, background-color 120ms ease-out;
}

.tab:hover { color: var(--ink); background: rgba(95, 168, 201, 0.07); }

.tab[aria-selected="true"] {
  background: var(--bg);
  border-color: var(--line-strong);
  color: var(--ink);
  box-shadow: inset 0 2px 0 var(--amber);
}

.tab-index {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--ink-faint);
}

.tab[aria-selected="true"] .tab-index { color: var(--amber); }

.tab-kind {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--ink-faint);
}

/* ---------------------------------------------------------------- main */

.console-main {
  max-width: 72rem;
  margin: 0 auto;
  padding: var(--s5);
}

.panel[hidden] { display: none; }

.panel {
  display: grid;
  gap: var(--s5);
}

/* ---------------------------------------------------------------- stage */

.stage {
  display: grid;
  gap: var(--s2);
}

.stage-frame {
  position: relative;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  background: var(--bg-inset);
  overflow: hidden;
}

/* corner registration ticks */
.stage-frame::before,
.stage-frame::after {
  content: "";
  position: absolute;
  width: 10px;
  height: 10px;
  border: 1px solid var(--amber-dim);
  pointer-events: none;
  z-index: 1;
}

.stage-frame::before { top: 6px; left: 6px; border-right: none; border-bottom: none; }
.stage-frame::after  { bottom: 6px; right: 6px; border-left: none; border-top: none; }

.stage-frame canvas {
  display: block;
  width: 100%;
  height: auto;
  max-height: 70vh;
  object-fit: contain;
  touch-action: none;
}

.stage-legend {
  position: absolute;
  top: var(--s2);
  right: var(--s2);
  display: flex;
  align-items: center;
  gap: var(--s2);
  padding: var(--s1) var(--s2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(8, 10, 15, 0.82);
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink-dim);
}

.legend-swatch {
  width: 0.625rem;
  height: 0.625rem;
  border-radius: 2px;
  margin-left: var(--s2);
}

.legend-swatch:first-child { margin-left: 0; }

.legend-fast   { background: var(--sw-fast); }
.legend-slow   { background: var(--sw-slow); }
.legend-wall   { background: var(--sw-wall); }
.legend-fixed  { background: var(--sw-fixed); }
.legend-load   { background: var(--sw-load); }
.legend-stress { background: var(--sw-stress); }

.hint {
  font-size: 0.8125rem;
  color: var(--ink-dim);
}

.hint strong { color: var(--ink); font-weight: 600; }

.hint-key {
  display: inline-block;
  padding: 0 var(--s1);
  border: 1px solid var(--line-strong);
  border-bottom-width: 2px;
  border-radius: var(--radius);
  background: var(--bg-raised);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--ink);
}

.hint-sep { margin: 0 var(--s2); color: var(--ink-faint); }

/* ------------------------------------------------------------- controls */

.controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: var(--s4) var(--s5);
  padding: var(--s4);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--bg-raised);
}

.control {
  display: grid;
  gap: var(--s2);
  align-content: start;
}

.control-wide { grid-column: 1 / -1; }

.control label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--ink);
}

.control-unit {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 400;
  color: var(--ink-faint);
}

.control-row {
  display: flex;
  align-items: center;
  gap: var(--s3);
}

.control-value {
  min-width: 3.5ch;
  padding: var(--s1) var(--s2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-inset);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-variant-numeric: tabular-nums;
  text-align: right;
  color: var(--amber);
}

/* range inputs */

input[type="range"] {
  flex: 1;
  min-width: 6rem;
  height: 1.25rem;
  margin: 0;
  background: transparent;
  accent-color: var(--amber);
  cursor: ew-resize;
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--steel-dim), var(--line-strong));
}

input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  width: 14px;
  height: 14px;
  margin-top: -5px;
  border: 2px solid var(--bg);
  border-radius: 2px;
  background: var(--amber);
  transition: transform 120ms ease-out;
}

input[type="range"]:hover::-webkit-slider-thumb { transform: scale(1.2); }

input[type="range"]::-moz-range-track {
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--steel-dim), var(--line-strong));
}

input[type="range"]::-moz-range-thumb {
  width: 10px;
  height: 10px;
  border: 2px solid var(--bg);
  border-radius: 2px;
  background: var(--amber);
}

/* buttons */

.control-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: var(--s3);
}

.btn {
  padding: var(--s2) var(--s4);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--bg-inset);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--ink);
  transition: border-color 120ms ease-out, background-color 120ms ease-out, transform 80ms ease-out;
}

.btn:hover { border-color: var(--steel); background: rgba(95, 168, 201, 0.1); }

.btn:active { transform: translateY(1px); }

.btn-primary {
  border-color: var(--amber-dim);
  background: rgba(240, 168, 50, 0.12);
  color: var(--amber);
}

.btn-primary:hover {
  border-color: var(--amber);
  background: rgba(240, 168, 50, 0.2);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

/* --------------------------------------------------------- result cards */

.result-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr));
  gap: var(--s4);
}

.result-card {
  padding: var(--s4);
  border: 1px solid var(--line);
  border-left: 3px solid var(--steel-dim);
  border-radius: var(--radius-lg);
  background: var(--bg-raised);
}

.result-label {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-dim);
}

.result-value {
  margin: var(--s1) 0;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--steel);
  overflow-wrap: anywhere;
}

.result-note {
  font-size: 0.6875rem;
  color: var(--ink-faint);
}

/* --------------------------------------------------------------- footer */

.console-footer {
  max-width: 72rem;
  margin: 0 auto;
  padding: 0 var(--s5) var(--s6);
}

.console-footer p {
  padding-top: var(--s4);
  border-top: 1px solid var(--line);
  font-size: 0.8125rem;
  color: var(--ink-dim);
  max-width: 62ch;
}

.console-footer strong { color: var(--ink); }

.console-footer abbr {
  text-decoration: underline dotted var(--ink-faint);
  text-underline-offset: 2px;
  cursor: help;
}

/* ---------------------------------------------------------- breakpoints */

@media (max-width: 54rem) {
  .console-header { justify-content: flex-start; }
  .readout dd { font-size: 1.0625rem; }
}

@media (max-width: 40rem) {
  .console-header,
  .mode-tabs { padding-left: var(--s4); padding-right: var(--s4); }
  .console-main { padding: var(--s4); }
  .console-footer { padding-left: var(--s4); padding-right: var(--s4); }

  .header-cluster { width: 100%; justify-content: space-between; }

  .tab-list { flex-direction: column; gap: 0; }
  .tab {
    border: 1px solid transparent;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  }
  .tab[aria-selected="true"] {
    box-shadow: inset 2px 0 0 var(--amber);
    border-color: var(--line-strong);
  }

  .stage-legend { position: static; margin: var(--s2); justify-content: flex-start; }

  .control-actions { flex-direction: column; align-items: stretch; }
  .btn { width: 100%; }
}

/* ------------------------------------------------------- reduced motion */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}