:root {
  --bg: #090b10;
  --surface: #12161f;
  --surface-alt: #171d2b;
  --text: #edf0f7;
  --muted: #a4adc1;
  --border: #2a3344;
  --accent: #d7defe;
  --line-p10: #4562a1;
  --line-p50: #d7defe;
  --line-p90: #a4f2d0;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg);
}

.container {
  width: min(1250px, 94vw);
  margin: 0 auto;
}

.header {
  padding: 1.5rem 0 0.95rem;
}

.back-link {
  color: var(--accent);
  text-decoration: none;
  font-weight: 700;
}

h1,
h2,
h3 {
  margin: 0;
}

h1 {
  margin-top: 0.55rem;
  font-size: clamp(2rem, 3.8vw, 3.1rem);
  font-family: "Cormorant Garamond", Georgia, serif;
  line-height: 1.08;
}

.header p {
  color: var(--muted);
  margin: 0.5rem 0 0;
  max-width: 74ch;
}

.layout {
  display: grid;
  grid-template-columns: 360px minmax(0, 1fr);
  gap: 0.95rem;
  padding-bottom: 2rem;
}

.panel {
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  box-shadow: 0 14px 38px rgba(0, 0, 0, 0.3);
}

.controls {
  padding: 0.9rem;
}

.preset-row {
  margin-top: 0.65rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-top: 0.7rem;
  color: var(--muted);
  font-size: 0.95rem;
}

input,
button,
select {
  font: inherit;
}

input[type="range"],
select {
  width: 100%;
}

select {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #172035;
  color: var(--text);
  padding: 0.44rem;
}

button {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #1a2234;
  color: var(--text);
  padding: 0.45rem 0.72rem;
  cursor: pointer;
}

button:hover,
button:focus-visible {
  border-color: #4d5f87;
}

button.primary {
  border-color: transparent;
  background: var(--accent);
  color: #0c1220;
  font-weight: 700;
}

.button-row {
  margin-top: 0.8rem;
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.status {
  min-height: 1.2rem;
  margin-top: 0.65rem;
  color: var(--muted);
}

.output {
  padding: 0.9rem;
  min-width: 0;
}

canvas {
  width: 100%;
  max-width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  margin-top: 0.6rem;
  background: #0e1321;
}

.legend {
  margin-top: 0.52rem;
  display: flex;
  gap: 0.7rem;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 0.85rem;
}

.legend span {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.legend-actions {
  margin-top: 0.45rem;
}

.legend-actions button {
  margin-top: 0;
  padding: 0.38rem 0.62rem;
  font-size: 0.84rem;
}

.legend-line {
  width: 22px;
  height: 2px;
  display: inline-block;
}

.line-p10 {
  background: var(--line-p10);
}

.line-p50 {
  background: var(--line-p50);
}

.line-p90 {
  background: var(--line-p90);
}

.metrics {
  margin-top: 0.75rem;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.5rem;
}

.metrics article {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface-alt);
  padding: 0.55rem;
}

.metrics h3 {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.metrics p {
  margin: 0.2rem 0 0;
  font-family: "JetBrains Mono", monospace;
}

.distribution {
  margin-top: 0.6rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #0e1321;
  padding: 0.6rem;
  min-height: 170px;
  display: grid;
  grid-template-columns: repeat(10, minmax(0, 1fr));
  gap: 0.3rem;
  align-items: end;
}

.distribution .bin {
  border-radius: 7px 7px 2px 2px;
  background: #3f5f9e;
  position: relative;
  min-height: 8px;
}

.distribution .bin::after {
  content: attr(data-label);
  position: absolute;
  bottom: -1.15rem;
  left: 50%;
  transform: translateX(-50%);
  color: #8895b1;
  font-size: 0.64rem;
  white-space: nowrap;
}

.insight {
  margin-top: 0.6rem;
  color: var(--muted);
}

@media (max-width: 1120px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .metrics {
    grid-template-columns: 1fr;
  }

  .distribution {
    min-height: 140px;
  }
}