:root {
  --bg: #0f1220;
  --panel: #151a2b;
  --muted: #aab1c5;
  --text: #e6e8ef;
  --accent: #6ea8fe;
  --good: #4ade80;
  --warn: #fbbf24;
  --bad: #fb7185;
}

* {
  box-sizing: border-box;
}
body {
  margin: 0;
  font: 14px/1.5 system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell,
    "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  color: var(--text);
  background: radial-gradient(
    1200px 600px at 20% -10%,
    #1c2340 0%,
    #0f1220 60%
  );
  min-height: 100vh;
}
.wrap {
  max-width: 960px;
  margin: 24px auto;
  padding: 0 16px;
}
.head h1 {
  margin: 0 0 6px;
  letter-spacing: 0.2px;
}
.sub {
  margin: 0;
  color: var(--muted);
}

.panel {
  margin-top: 16px;
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 16px;
  padding: 16px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.row {
  display: flex;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}
.toggle {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  cursor: pointer;
}
.toggle input {
  width: 18px;
  height: 18px;
}

.btn {
  padding: 8px 12px;
  background: var(--accent);
  border: 0;
  border-radius: 10px;
  color: #0a1020;
  font-weight: 600;
  cursor: pointer;
}
.btn.ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 16px;
}
@media (min-width: 768px) {
  .grid {
    grid-template-columns: repeat(2, minmax(280px, 1fr));
  }
}
@media (min-width: 1200px) {
  .grid {
    grid-template-columns: repeat(3, minmax(250px, 1fr));
  }
}

.field label {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
}
.ctrl {
  display: grid;
  grid-template-columns: 1fr 110px;
  gap: 10px;
  align-items: center;
}
.chart-container {
  margin-top: 12px;
  height: 200px;
  background: rgba(14, 19, 38, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  padding: 8px;
}

.charts-section h2 {
  margin: 0 0 16px;
  color: var(--text);
  font-size: 18px;
  font-weight: 600;
}

.charts-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.chart-field h3 {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 500;
}

.chart-field .chart-container {
  margin-top: 0;
  height: 350px;
}

input[type="number"],
input[type="range"] {
  width: 100%;
}
input[type="number"] {
  background: #0e1326;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  color: var(--text);
  padding: 8px 10px;
}

.results {
  display: grid;
  gap: 16px;
}
.grade {
  display: flex;
  gap: 16px;
  align-items: center;
}
.badge {
  width: 84px;
  height: 84px;
  border-radius: 20px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, #7dd3fc, #818cf8);
  color: #0a1020;
  font-size: 40px;
  font-weight: 900;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
}
.meta .label {
  color: var(--muted);
  font-size: 12px;
}
.big {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: 0.2px;
}
.note {
  color: var(--muted);
  font-size: 12px;
}

.ladder {
  margin-top: 4px;
}
.ladder-bar {
  position: relative;
  height: 12px;
  border-radius: 999px;
  background: linear-gradient(
    90deg,
    #34d399 0% 1%,
    #60a5fa 1% 12.5%,
    #818cf8 12.5% 25%,
    #a78bfa 25% 37.5%,
    #f59e0b 37.5% 50%,
    #f97316 50% 62.5%,
    #fb7185 62.5% 75%,
    #f43f5e 75% 87.5%,
    #ef4444 87.5% 100%
  );
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.25);
}
.marker {
  position: absolute;
  top: -6px;
  width: 2px;
  height: 24px;
  background: #fff;
  box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.2);
}
.legend {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  font-size: 12px;
  color: var(--muted);
  margin-top: 6px;
}

.foot details {
  margin-top: 10px;
  color: var(--muted);
}
pre {
  white-space: pre-wrap;
}