:root {
  --ink: #16120f;
  --muted: #625b53;
  --paper: #f3efe6;
  --panel: #fffaf0;
  --line: #d8cab4;
  --accent: #9b2f21;
  --accent-2: #d67b36;
  --sea: #557f78;
  --shadow: 0 22px 60px rgba(74, 48, 25, 0.16);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: Georgia, "Times New Roman", serif;
  background:
    radial-gradient(circle at 8% 10%, rgba(214, 123, 54, 0.22), transparent 28rem),
    radial-gradient(circle at 88% 4%, rgba(85, 127, 120, 0.18), transparent 30rem),
    linear-gradient(135deg, #efe5d3 0%, #f7f1e8 45%, #eadcc6 100%);
}

.shell {
  width: min(1180px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 34px 0 48px;
}

.hero {
  display: grid;
  gap: 8px;
  margin-bottom: 24px;
}

.eyebrow {
  margin: 0;
  color: var(--accent);
  font-family: "Trebuchet MS", Verdana, sans-serif;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  max-width: 850px;
  font-size: clamp(2.1rem, 5vw, 4.5rem);
  line-height: 0.93;
  letter-spacing: -0.055em;
}

.lede {
  max-width: 760px;
  margin: 4px 0 0;
  color: var(--muted);
  font-family: "Trebuchet MS", Verdana, sans-serif;
  font-size: 1.02rem;
  line-height: 1.5;
}

.lede a {
  color: var(--accent);
  font-weight: 700;
  text-decoration-color: rgba(155, 47, 33, 0.38);
  text-underline-offset: 3px;
}

.panel {
  padding: 20px;
  border: 1px solid rgba(75, 52, 29, 0.18);
  border-radius: 28px;
  background: rgba(255, 250, 240, 0.88);
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
}

.controls {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 16px;
}

.control-card {
  min-height: 104px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fffdf7;
}

.control-label,
.stat-label {
  display: block;
  margin-bottom: 10px;
  color: var(--muted);
  font-family: "Trebuchet MS", Verdana, sans-serif;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.button-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 8px;
  align-items: center;
}

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

button {
  min-height: 42px;
  border: 1px solid #9f7d59;
  border-radius: 999px;
  color: #fffaf0;
  background: var(--accent);
  font-family: "Trebuchet MS", Verdana, sans-serif;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
}

button:hover:not(:disabled),
button.active {
  background: #5f241c;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.38;
}

button.secondary {
  width: 100%;
  margin-top: 10px;
  color: var(--accent);
  background: #fff7e8;
}

.readout {
  min-width: 84px;
  padding: 10px 12px;
  border-radius: 999px;
  color: var(--ink);
  background: #f1e6d2;
  font-family: "Trebuchet MS", Verdana, sans-serif;
  font-weight: 700;
  text-align: center;
}

.slider-row {
  display: grid;
  grid-template-columns: 1fr 58px;
  gap: 10px;
  align-items: center;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

output {
  font-family: "Trebuchet MS", Verdana, sans-serif;
  font-weight: 700;
  text-align: right;
}

.status-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.status-grid > div {
  padding: 12px 14px;
  border-radius: 16px;
  background: #eadfc9;
}

.status-grid strong {
  font-family: "Trebuchet MS", Verdana, sans-serif;
  font-size: 1.2rem;
}

.plot-box {
  position: relative;
  width: 100%;
  height: 560px;
  overflow: hidden;
  border: 1px solid #bea889;
  border-radius: 20px;
  background:
    linear-gradient(#fffdf8, #fffdf8) padding-box,
    repeating-linear-gradient(
      0deg,
      rgba(98, 91, 83, 0.08) 0,
      rgba(98, 91, 83, 0.08) 1px,
      transparent 1px,
      transparent 64px
    );
}

svg {
  display: block;
  width: 100%;
  height: 100%;
}

.axis path,
.axis line {
  stroke: #2d2620;
  stroke-width: 1.2;
  vector-effect: non-scaling-stroke;
}

.tick.text,
.axis-title,
.plot-note {
  fill: var(--muted);
  font-family: "Trebuchet MS", Verdana, sans-serif;
  font-size: 13px;
}

.step {
  fill: url(#valueGradient);
  stroke: rgba(115, 60, 28, 0.36);
  stroke-width: 0.65;
  vector-effect: non-scaling-stroke;
}

.zero-step {
  fill: rgba(88, 92, 96, 0.34);
  stroke: rgba(58, 62, 66, 0.5);
}

.zero-label {
  fill: rgba(45, 48, 52, 0.76);
  font-family: "Trebuchet MS", Verdana, sans-serif;
  font-size: 13px;
  font-weight: 700;
  pointer-events: none;
}

.empty-state {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: var(--muted);
  font-family: "Trebuchet MS", Verdana, sans-serif;
  font-size: 1.05rem;
  background: rgba(255, 253, 248, 0.76);
}

.empty-state[hidden] {
  display: none;
}

.tooltip {
  position: absolute;
  z-index: 3;
  max-width: 230px;
  padding: 10px 12px;
  border: 1px solid rgba(62, 47, 34, 0.22);
  border-radius: 12px;
  color: var(--ink);
  background: rgba(255, 250, 240, 0.96);
  box-shadow: 0 12px 32px rgba(52, 38, 24, 0.2);
  font-family: "Trebuchet MS", Verdana, sans-serif;
  font-size: 0.88rem;
  line-height: 1.35;
  pointer-events: none;
}

.tooltip[hidden] {
  display: none;
}

.tooltip strong {
  display: block;
  margin-bottom: 4px;
  color: var(--accent);
}

@media (max-width: 900px) {
  .controls,
  .status-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .plot-box {
    height: 500px;
  }
}

@media (max-width: 560px) {
  .controls,
  .status-grid {
    grid-template-columns: 1fr;
  }

  .panel {
    padding: 14px;
    border-radius: 20px;
  }

  .plot-box {
    height: 430px;
  }
}