:root {
  --bg: #0a1420;
  --surface-1: #0f1e2e;
  --surface-2: #152a3f;
  --text: #e8f4fb;
  --text-muted: #7a94a8;
  --accent: #40c4ff;
  --accent-support: #ff8a3d;
  --success: #3ddc97;
  --danger: #ff5c6c;
  --font-display: "JetBrains Mono", ui-monospace, "SF Mono", monospace;
  --font-ui: "Inter", system-ui, sans-serif;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --radius-panel: 4px;
  --radius-control: 2px;
}

* {
  box-sizing: border-box;
}

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

body {
  background:
    linear-gradient(rgba(64, 196, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(64, 196, 255, 0.04) 1px, transparent 1px),
    radial-gradient(ellipse at center, var(--bg) 60%, #060d16 100%);
  background-size: 24px 24px, 24px 24px, cover;
  color: var(--text);
  font-family: var(--font-ui);
  line-height: 1.5;
}

h1,
h2,
h3,
.mono {
  font-family: var(--font-display);
}

a {
  color: var(--accent);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.app-shell {
  min-height: 100%;
  display: flex;
  flex-direction: column;
}

.topbar {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid rgba(64, 196, 255, 0.12);
}

.wordmark {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: lowercase;
  color: var(--text);
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

.wordmark-glyph {
  color: var(--accent);
  font-size: 0.9em;
}

.tagline {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.source-link {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  color: var(--text-muted);
  padding: 6px 10px;
  border: 1px solid rgba(64, 196, 255, 0.2);
  border-radius: var(--radius-control);
  transition: color 150ms ease-out, border-color 150ms ease-out, background 150ms ease-out;
}

.source-link:hover,
.source-link:focus-visible {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(64, 196, 255, 0.08);
  outline: none;
}

.explainer {
  border-top: 1px solid rgba(64, 196, 255, 0.12);
  padding: var(--space-6) var(--space-4);
  background:
    linear-gradient(rgba(64, 196, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(64, 196, 255, 0.03) 1px, transparent 1px),
    var(--surface-1);
  background-size: 24px 24px, 24px 24px, cover;
}

.explainer-inner {
  max-width: 68ch;
  margin: 0 auto;
}

.explainer h2 {
  font-size: 1.4rem;
  margin: 0 0 var(--space-3);
  color: var(--text);
}

.explainer h3 {
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  margin: var(--space-4) 0 var(--space-2);
  color: var(--accent);
}

.explainer p,
.explainer li,
.explainer dd {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.explainer p {
  margin: 0 0 var(--space-2);
}

.explainer ol {
  margin: 0;
  padding-left: 1.4em;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.faq {
  margin: 0;
}

.faq dt {
  color: var(--text);
  font-weight: 600;
  margin-top: var(--space-3);
}

.faq dd {
  margin: 6px 0 0;
}

.faq em {
  color: var(--accent);
  font-style: italic;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid rgba(64, 196, 255, 0.12);
  color: var(--text-muted);
  font-size: 0.75rem;
}

.site-footer a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 150ms ease-out;
}

.site-footer a:hover,
.site-footer a:focus-visible {
  color: var(--accent);
}

.layout {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(280px, 30%) 1fr;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4) var(--space-4);
  align-items: stretch;
}

.panel-heading {
  margin: 0 0 var(--space-3);
  font-size: 1rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.control-panel {
  background: var(--surface-1);
  border: 1px solid rgba(64, 196, 255, 0.14);
  border-radius: var(--radius-panel);
  padding: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.control {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.control-label-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-1);
}

.control label {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.control-value {
  font-size: 0.875rem;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.compute-time {
  margin: 0;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.compute-time.is-error {
  color: var(--danger);
}

/* Themed range slider: a flat cyan-on-navy track with a crisp square-ish
   thumb, matching the blueprint/drafting-table direction rather than the
   rounded native control. Duplicated across -webkit-/-moz- prefixes since
   there's no unprefixed shorthand with consistent cross-browser support. */
input[type="range"] {
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  height: 44px;
  margin: 0;
  background: transparent;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 4px;
  background: var(--surface-2);
  border-radius: var(--radius-control);
  border: 1px solid rgba(64, 196, 255, 0.2);
}

input[type="range"]::-moz-range-track {
  height: 4px;
  background: var(--surface-2);
  border-radius: var(--radius-control);
  border: 1px solid rgba(64, 196, 255, 0.2);
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  margin-top: -7px;
  background: var(--accent);
  border-radius: var(--radius-control);
  border: none;
  box-shadow: 0 0 8px rgba(64, 196, 255, 0.5);
  transition: transform 150ms ease-out, box-shadow 150ms ease-out;
}

input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  background: var(--accent);
  border-radius: var(--radius-control);
  border: none;
  box-shadow: 0 0 8px rgba(64, 196, 255, 0.5);
  transition: transform 150ms ease-out, box-shadow 150ms ease-out;
}

input[type="range"]:hover::-webkit-slider-thumb,
input[type="range"]:active::-webkit-slider-thumb {
  transform: scale(1.15);
  box-shadow: 0 0 14px rgba(64, 196, 255, 0.8);
}

input[type="range"]:hover::-moz-range-thumb,
input[type="range"]:active::-moz-range-thumb {
  transform: scale(1.15);
  box-shadow: 0 0 14px rgba(64, 196, 255, 0.8);
}

input[type="range"]:focus-visible {
  outline: none;
}

input[type="range"]:focus-visible::-webkit-slider-thumb {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

input[type="range"]:focus-visible::-moz-range-thumb {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

input[type="range"]:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.kelly-row {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-2);
  background: var(--surface-2);
  border-radius: var(--radius-panel);
  border: 1px solid rgba(64, 196, 255, 0.14);
}

.toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  background: none;
  border: none;
  color: var(--text);
  font-family: var(--font-ui);
  font-size: 0.875rem;
  cursor: pointer;
  padding: var(--space-1) 0;
  min-height: 44px;
}

.toggle-track {
  width: 36px;
  height: 20px;
  border-radius: 10px;
  background: rgba(122, 148, 168, 0.3);
  border: 1px solid rgba(64, 196, 255, 0.2);
  position: relative;
  transition: background 150ms ease-out;
  flex-shrink: 0;
}

.toggle-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: transform 150ms ease-out, background 150ms ease-out;
}

.toggle[aria-checked="true"] .toggle-track {
  background: rgba(64, 196, 255, 0.35);
}

.toggle[aria-checked="true"] .toggle-thumb {
  transform: translateX(16px);
  background: var(--accent);
  box-shadow: 0 0 8px rgba(64, 196, 255, 0.6);
}

.toggle:hover .toggle-track {
  border-color: var(--accent);
}

.toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--radius-control);
}

.kelly-readout {
  margin: 0;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.chart-hero {
  position: relative;
  background: var(--surface-1);
  border: 1px solid rgba(64, 196, 255, 0.14);
  border-radius: var(--radius-panel);
  box-shadow: 0 0 24px rgba(64, 196, 255, 0.08);
  min-height: 60vh;
  display: flex;
  flex-direction: column;
  padding: var(--space-2);
}

#fan-canvas {
  flex: 1;
  width: 100%;
  min-height: 0;
  border-radius: var(--radius-control);
}

.counter-chip {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  background: var(--surface-2);
  border: 1px solid rgba(64, 196, 255, 0.25);
  border-radius: var(--radius-panel);
  padding: var(--space-2) var(--space-3);
  text-align: right;
  z-index: 2;
  transition: box-shadow 150ms ease-out;
}

.counter-chip.is-danger {
  box-shadow: 0 0 20px rgba(255, 92, 108, 0.5);
}

.counter-label {
  display: block;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.counter-value {
  display: block;
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 700;
  color: var(--danger);
  font-variant-numeric: tabular-nums;
}

.legend {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin: var(--space-2) 0 0;
  padding: 0;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.legend li {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.legend .swatch {
  display: inline-block;
  width: 12px;
  height: 2px;
}

/* Below tablet width, the fan chart (the wow moment) leads the page and the
   controls scroll below it as a single column, per DESIGN.md's phone layout
   intent — the hero never loses top billing to the controls. */
@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto;
  }

  .chart-hero {
    order: -1;
    min-height: 60vh;
  }
}

@media (max-width: 480px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-1);
    padding: var(--space-2) var(--space-2);
  }

  .layout {
    padding: var(--space-2);
    gap: var(--space-2);
  }

  .counter-chip {
    top: var(--space-2);
    right: var(--space-2);
    padding: var(--space-1) var(--space-2);
  }
}

/* Odometer-style digit roll for the risk-of-ruin counter: each character is
   an overflow-hidden window; main.js slides the outgoing glyph up-and-out
   while the incoming one slides up-and-in from below. */
.counter-value {
  display: inline-flex;
}

.counter-digit {
  position: relative;
  display: inline-block;
  overflow: hidden;
  height: 1.15em;
  width: 0.62em;
  text-align: center;
}

.counter-digit:last-child {
  width: auto;
}

.counter-digit-face {
  position: absolute;
  inset: 0;
  transition: transform 220ms ease-out, opacity 220ms ease-out;
}

.counter-digit-face.is-entering {
  transform: translateY(100%);
  opacity: 0;
}

.counter-digit-face.is-current {
  transform: translateY(0);
  opacity: 1;
}

.counter-digit-face.is-exiting {
  transform: translateY(-100%);
  opacity: 0;
}

/* Fan-chart sweep: a thin scanline animates left-to-right on recompute,
   reinforcing that the instrument just re-measured (see DESIGN.md). */
.chart-hero .sweep {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 3px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
  pointer-events: none;
  z-index: 1;
}

.chart-hero .sweep.is-sweeping {
  animation: sweep-across 320ms ease-out;
}

@keyframes sweep-across {
  from {
    left: 0;
    opacity: 0.9;
  }
  to {
    left: 100%;
    opacity: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .counter-digit-face {
    transition: none;
  }

  .chart-hero .sweep.is-sweeping {
    animation: none;
    opacity: 0;
  }

  input[type="range"]::-webkit-slider-thumb,
  input[type="range"]::-moz-range-thumb,
  .toggle-track,
  .toggle-thumb,
  .counter-chip {
    transition: none;
  }
}