:root {
  --page: #f4f7f8;
  --surface: #ffffff;
  --ink: #202631;
  --muted: #647184;
  --line: #d7dfe7;
  --axis: #303846;
  --demand: #1f6f8b;
  --supply: #8a4f2a;
  --policy: #7f1d1d;
  --cs: rgba(113, 171, 226, 0.46);
  --ps: rgba(235, 126, 126, 0.42);
  --gr: rgba(113, 184, 139, 0.5);
  --ge: rgba(245, 208, 91, 0.6);
  --dwl: rgba(124, 132, 145, 0.5);
  --focus: #c98900;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--page);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.app {
  display: grid;
  grid-template-columns: minmax(280px, 360px) minmax(0, 1fr);
  gap: 20px;
  width: min(1240px, calc(100% - 32px));
  margin: 24px auto;
}

.controls,
.graphPanel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.controls {
  align-self: start;
  display: grid;
  gap: 18px;
  padding: 22px;
}

.titleBlock {
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 6px;
  font-size: 1.55rem;
  line-height: 1.15;
}

h2 {
  margin-bottom: 10px;
  font-size: 1rem;
  line-height: 1.2;
}

p {
  margin-bottom: 0;
  color: var(--muted);
}

.controlGroup {
  display: grid;
  gap: 10px;
}

.equation {
  width: fit-content;
  padding: 5px 9px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #f7fafc;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.95rem;
}

label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 0.92rem;
}

output {
  min-width: 54px;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  text-align: right;
}

input[type="range"] {
  width: 100%;
  accent-color: #1f6f8b;
}

.segmented {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
  margin: 0;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f5f8fb;
}

.policyLineSecondary {
  stroke: var(--policy);
  stroke-width: 2;
  stroke-dasharray: 3 5;
  fill: none;
}

.segmented label {
  justify-content: center;
  min-height: 38px;
  border-radius: 6px;
  color: var(--ink);
  cursor: pointer;
}

.segmented input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.segmented label:has(input:checked) {
  background: #ffffff;
  box-shadow: 0 1px 3px rgba(32, 38, 49, 0.16);
  font-weight: 700;
}

.shadeControls {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  border: 0;
}

.shadeControls label {
  display: grid;
  grid-template-columns: 18px 1fr auto;
  min-height: 32px;
  color: var(--ink);
  cursor: pointer;
}

.shadeControls input {
  width: 17px;
  height: 17px;
  margin: 0;
  accent-color: #1f6f8b;
}

.shadeControls span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.shadeControls i {
  width: 13px;
  height: 13px;
  border: 1px solid rgba(32, 38, 49, 0.2);
}

.areaValue {
  min-width: 64px;
  font-weight: 700;
}

.shadeControls .cs {
  background: var(--cs);
}

.shadeControls .ps {
  background: var(--ps);
}

.shadeControls .gr {
  background: var(--gr);
}

.shadeControls .ge {
  background: var(--ge);
}

.shadeControls .dwl {
  background: var(--dwl);
}

button:focus-visible,
input:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.graphPanel {
  min-width: 0;
  padding: 18px;
}

.graphHeader {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 12px;
}

.graphHeader h2 {
  margin-bottom: 4px;
  font-size: 1.2rem;
}

#marketGraph {
  display: block;
  width: 100%;
  height: min(68vh, 660px);
  min-height: 430px;
  border: 1px solid var(--line);
  background: #fbfcfd;
}

.axis,
.tick {
  stroke: var(--axis);
  stroke-width: 1;
}

.tickLabel {
  fill: var(--muted);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}

.grid {
  stroke: #e6ebf1;
  stroke-width: 1;
}

.curveDemand {
  stroke: var(--demand);
  stroke-width: 3;
  fill: none;
}

.curveSupply {
  stroke: var(--supply);
  stroke-width: 3;
  fill: none;
}

.policyLine {
  stroke: var(--policy);
  stroke-width: 2.5;
  stroke-dasharray: 9 6;
  fill: none;
}

.guide {
  stroke: #6d7786;
  stroke-width: 1.25;
  stroke-dasharray: 5 5;
}

.label {
  fill: var(--ink);
  font-size: 14px;
  font-weight: 650;
}

.axisLabel {
  fill: var(--axis);
  font-size: 15px;
  font-weight: 700;
}

.softLabel {
  fill: var(--muted);
  font-size: 12px;
}

.point {
  fill: var(--ink);
}

.csFill {
  fill: var(--cs);
}

.psFill {
  fill: var(--ps);
}

.dwlFill {
  fill: var(--dwl);
}

.grFill {
  fill: var(--gr);
}

.geFill {
  fill: var(--ge);
}

@media (max-width: 860px) {
  .app {
    grid-template-columns: 1fr;
  }

  .graphHeader {
    display: grid;
  }

  #marketGraph {
    height: 62vh;
    min-height: 360px;
  }
}

@media (max-width: 520px) {
  .app {
    width: min(100% - 20px, 1240px);
    margin: 10px auto 20px;
  }

  .controls,
  .graphPanel {
    padding: 14px;
  }

  .segmented {
    grid-template-columns: 1fr;
  }

}