:root {
  color-scheme: light;
  font-family:
    ui-rounded, "SF Pro Rounded", "Avenir Next", system-ui, -apple-system,
    BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-synthesis: none;
  --ink: #172033;
  --muted: #64748b;
  --blue: #2563eb;
  --violet: #7654c4;
  --violet-deep: #5f3fac;
  --distance: #d97706;
  --distance-light: #fbbf24;
  --green: #087154;
}

* { box-sizing: border-box; }
html, body { min-height: 100%; }

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 9% 5%, rgb(118 84 196 / 8%), transparent 28rem),
    #f6f7fb;
  overscroll-behavior: none;
}

button, svg { -webkit-tap-highlight-color: transparent; }

.absolute-shell {
  width: min(100%, 1480px);
  margin: 0 auto;
  padding:
    max(18px, env(safe-area-inset-top))
    max(18px, env(safe-area-inset-right))
    max(18px, env(safe-area-inset-bottom))
    max(18px, env(safe-area-inset-left));
}

.absolute-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 22px;
  margin-bottom: 16px;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--blue);
  font-size: clamp(0.82rem, 1.5vw, 1rem);
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  max-width: 1100px;
  margin: 0;
  font-size: clamp(1.7rem, 3.8vw, 3.35rem);
  line-height: 1.03;
  letter-spacing: -0.035em;
}

.subtitle {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: clamp(1rem, 1.8vw, 1.35rem);
  font-weight: 650;
}

.local-note {
  flex: 0 0 auto;
  margin: 4px 0 0;
  padding: 9px 14px;
  border: 1px solid #b9e5d5;
  border-radius: 999px;
  color: var(--green);
  background: #ecfdf5;
  font-size: clamp(0.74rem, 1.2vw, 0.9rem);
  font-weight: 750;
  white-space: nowrap;
}

.local-note span { margin-right: 5px; font-size: 0.7em; }

.absolute-visualizer,
.absolute-insight {
  border: 1px solid rgb(203 213 225 / 82%);
  border-radius: 26px;
  background: rgb(255 255 255 / 94%);
  box-shadow: 0 20px 60px rgb(30 41 59 / 9%);
}

.absolute-visualizer { min-width: 0; padding: clamp(8px, 1.4vw, 16px); }
.absolute-stage { position: relative; min-height: 0; }

.absolute-board {
  display: block;
  width: 100%;
  max-height: min(57dvh, 610px);
  border-radius: 20px;
  touch-action: none;
  user-select: none;
}

.absolute-prompt {
  position: absolute;
  z-index: 2;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 20px;
  padding: 30px;
  text-align: center;
}

.absolute-prompt[hidden] { display: none; }
.absolute-prompt p { margin: 0; color: var(--muted); font-size: clamp(1.2rem, 2.5vw, 1.8rem); font-weight: 760; }
.absolute-prompt .prompt-formula { color: var(--ink); font-size: clamp(3.6rem, 10vw, 7.2rem); font-weight: 900; letter-spacing: -0.05em; line-height: 1; }

.board-background { fill: #f8fafc; stroke: #dbe4ef; stroke-width: 4; }
.absolute-axis-arrow { fill: #64748b; }
.absolute-axis { stroke: #64748b; stroke-linecap: butt; stroke-width: 7; }

.absolute-tick line { stroke-linecap: round; stroke-width: 5; }
.absolute-tick text {
  paint-order: stroke;
  stroke: #f8fafc;
  stroke-linejoin: round;
  stroke-width: 11px;
  font-size: 38px;
  font-weight: 850;
  text-anchor: middle;
}

.negative-tick line { stroke: rgb(118 84 196 / 52%); }
.negative-tick text { fill: var(--violet); }
.positive-tick line { stroke: rgb(37 99 235 / 58%); }
.positive-tick text { fill: var(--blue); }
.zero-tick line { stroke: #334155; stroke-width: 7; }
.zero-tick text { fill: #334155; }
.reference-tick line { stroke-width: 8; }

.marker-halo { stroke-width: 4; }
.marker-dot { stroke: white; stroke-width: 7; }
.negative-marker .marker-halo { fill: rgb(118 84 196 / 14%); stroke: rgb(95 63 172 / 28%); }
.negative-marker .marker-dot { fill: var(--violet-deep); filter: drop-shadow(0 7px 10px rgb(95 63 172 / 26%)); }
.positive-marker .marker-halo { fill: rgb(37 99 235 / 12%); stroke: rgb(37 99 235 / 24%); }
.positive-marker .marker-dot { fill: var(--blue); filter: drop-shadow(0 7px 10px rgb(37 99 235 / 25%)); }

#absolute-direction-arrow path { fill: var(--violet-deep); }
.absolute-direction line { stroke: var(--violet-deep); stroke-linecap: round; stroke-width: 7; }
.absolute-direction text { fill: var(--violet-deep); font-size: 29px; font-weight: 820; text-anchor: middle; }

.distance-line { stroke: var(--distance-light); stroke-linecap: butt; stroke-width: 18; }
.distance-boundaries line { stroke: var(--distance); stroke-linecap: round; stroke-width: 5; }
.positive-distance .distance-line { stroke: rgb(251 191 36 / 74%); }

.absolute-formula rect { fill: #fff; stroke: rgb(217 119 6 / 32%); stroke-width: 4; }
.absolute-formula text { fill: #9a5208; font-size: 46px; font-weight: 900; text-anchor: middle; }
.equality-formula text { font-size: 43px; }

.absolute-point-control { transform-box: fill-box; transform-origin: center; }
.point-halo { fill: rgb(51 65 85 / 11%); stroke: rgb(51 65 85 / 20%); stroke-width: 4; }
.absolute-point { fill: #334155; stroke: white; stroke-width: 8; filter: drop-shadow(0 7px 10px rgb(51 65 85 / 24%)); }
.absolute-board[data-value-sign="negative"] .point-halo { fill: rgb(118 84 196 / 13%); stroke: rgb(118 84 196 / 24%); }
.absolute-board[data-value-sign="negative"] .absolute-point { fill: var(--violet); }
.absolute-board[data-value-sign="positive"] .point-halo { fill: rgb(37 99 235 / 12%); stroke: rgb(37 99 235 / 22%); }
.absolute-board[data-value-sign="positive"] .absolute-point { fill: var(--blue); }

.absolute-point-handle { fill: transparent; stroke: transparent; cursor: grab; touch-action: none; }
.absolute-point-handle:active { cursor: grabbing; }
.absolute-point-handle:focus-visible { fill: rgb(37 99 235 / 7%); stroke: rgb(37 99 235 / 40%); stroke-width: 6; }
.current-value rect, .current-value path { fill: #172033; }
.current-value text { fill: white; font-size: 39px; font-weight: 900; text-anchor: middle; }

.absolute-insight {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 14px 24px;
  margin-top: 14px;
  padding: clamp(16px, 2vw, 24px);
  align-items: center;
}

.insight-text { margin: 0; font-size: clamp(1.05rem, 2vw, 1.45rem); font-weight: 780; line-height: 1.35; }
.absolute-controls { display: flex; gap: 10px; justify-content: flex-end; }
.primary-button, .reset-button { min-height: 56px; padding: 0 20px; border-radius: 16px; font: inherit; font-size: clamp(0.95rem, 1.5vw, 1.08rem); font-weight: 850; touch-action: manipulation; }
.primary-button { border: 2px solid var(--blue); color: white; background: var(--blue); box-shadow: 0 10px 24px rgb(37 99 235 / 20%); }
.reset-button { border: 2px solid #cbd5e1; color: var(--ink); background: white; }
.primary-button:disabled, .reset-button:disabled { cursor: wait; opacity: 0.58; }
.primary-button:focus-visible, .reset-button:focus-visible { outline: 5px solid rgb(37 99 235 / 26%); outline-offset: 3px; }

.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
noscript { display: block; margin-top: 14px; color: #a6384d; font-weight: 700; }

@media (max-width: 760px) {
  .absolute-shell { padding-inline: 12px; }
  .absolute-header { display: block; }
  .local-note { display: inline-block; margin-top: 12px; }
  .absolute-insight { grid-template-columns: 1fr; }
  .absolute-controls { justify-content: stretch; }
  .primary-button, .reset-button { flex: 1 1 0; }
}

@media (max-width: 520px) {
  .absolute-controls { flex-direction: column; }
  .primary-button, .reset-button { width: 100%; }
}

@media (orientation: landscape) and (max-height: 820px) {
  .absolute-shell { padding-block: 10px; }
  .absolute-header { margin-bottom: 9px; }
  h1 { font-size: clamp(1.5rem, 3.2vw, 2.65rem); }
  .subtitle { margin-top: 3px; }
  .absolute-board { max-height: 52dvh; }
  .absolute-insight { margin-top: 9px; padding-block: 12px; }
}

@media (min-width: 1500px) {
  .absolute-shell { width: min(94vw, 1660px); }
  .absolute-board { max-height: 640px; }
}

@media (prefers-reduced-motion: reduce) {
  .absolute-point, .marker-dot { filter: none; }
}