:root {
  --ink: #202020;
  --muted: #686868;
  --paper: #ffffff;
  --paper-deep: #f5f5f5;
  --line: #e2e2e2;
  --accent: #174a7e;
  --night: #ffffff;
  --night-soft: #f6f6f6;
  --night-line: #dfdfdf;
  --white: #202020;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

button,
select {
  font: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

.hero {
  position: relative;
  display: flex;
  padding: 132px max(28px, calc((100vw - 1320px) / 2)) 64px;
  flex-direction: column;
  align-items: center;
  color: var(--ink);
  background: #ffffff;
  text-align: center;
}

.hero h1 {
  max-width: 1320px;
  margin: 0;
  font-size: clamp(44px, 4.45vw, 64px);
  font-weight: 660;
  letter-spacing: -0.058em;
  line-height: 1.08;
}

.hero h1 .title-accent {
  color: var(--accent);
}

.title-line {
  display: block;
  color: var(--ink);
  white-space: nowrap;
}

.hero-actions {
  z-index: 1;
  display: flex;
  margin-top: 36px;
  gap: 12px;
}

.button {
  display: inline-flex;
  min-width: 142px;
  height: 49px;
  padding: 0 23px;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border: 1px solid #d2d2d2;
  font-size: 14px;
  font-weight: 680;
  transition: transform 150ms ease, background 150ms ease, border-color 150ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
}

.button-secondary svg {
  fill: currentColor;
  stroke: none;
}

.button-primary {
  border-color: var(--accent);
  color: var(--night);
  background: var(--accent);
}

.button-primary:hover {
  background: #0f365d;
}

.button-secondary {
  color: var(--white);
  background: #f7f7f7;
}

.button-secondary:hover {
  border-color: var(--accent);
  background: #eeeeee;
}

.content-section {
  display: grid;
  width: min(1120px, calc(100% - 56px));
  margin: 0 auto;
  padding: 72px 0;
  grid-template-columns: 210px minmax(0, 760px);
  gap: 70px;
}

.section-label {
  padding-top: 11px;
  color: #707070;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.section-label span {
  margin-right: 13px;
  color: var(--accent);
}

.section-label.light {
  color: #727272;
}

.section-label.light span {
  color: var(--accent);
}

.section-content h2,
.explorer-heading h2 {
  margin: 0;
  font-size: clamp(34px, 4vw, 52px);
  font-weight: 630;
  letter-spacing: -0.052em;
  line-height: 1.12;
}

.section-content {
  min-width: 0;
}

.section-content > p {
  max-width: 740px;
  margin: 21px 0 0;
  color: #5d5d5d;
  font-size: 16px;
  line-height: 1.82;
}

.section-content strong {
  color: #2a2a2a;
  font-weight: 680;
}

.explorer-section {
  padding: 72px max(28px, calc((100vw - 1240px) / 2)) 64px;
  background: var(--night);
  color: var(--white);
}

.explorer-heading {
  display: flex;
  margin: 24px 0 45px;
  align-items: end;
  justify-content: space-between;
  gap: 40px;
}

.explorer-heading h2 {
  font-size: clamp(36px, 4vw, 57px);
}

.explorer-heading p {
  max-width: 720px;
  margin: 17px 0 0;
  color: #686868;
  font-size: 16px;
  line-height: 1.7;
}

.metric-key {
  display: flex;
  padding-bottom: 4px;
  flex: 0 0 auto;
  gap: 20px;
  color: #777777;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.025em;
  text-transform: uppercase;
}

.metric-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 5px;
  border-radius: 50%;
  background: var(--accent);
}

.y-dot {
  background: var(--accent);
}

.explorer-shell {
  display: grid;
  min-height: 760px;
  overflow: hidden;
  grid-template-columns: 254px minmax(0, 1fr);
  border: 1px solid var(--night-line);
  background: #ffffff;
  box-shadow: 0 28px 75px rgba(0, 0, 0, 0.09);
}

.controls {
  display: flex;
  padding: 27px 23px 24px;
  flex-direction: column;
  border-right: 1px solid var(--night-line);
  background: #f6f6f6;
}

.controls-heading {
  margin-bottom: 23px;
}

.controls-heading h3 {
  margin: 0;
  font-size: 15px;
  font-weight: 660;
  letter-spacing: -0.02em;
}

.controls-heading p {
  margin: 5px 0 0;
  color: #707070;
  font-size: 11px;
  line-height: 1.55;
}

.field {
  display: block;
  margin-bottom: 14px;
}

.field > span,
.toolbar-label {
  display: block;
  margin-bottom: 6px;
  color: #666666;
  font-family: var(--mono);
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.field select {
  width: 100%;
  height: 39px;
  padding: 0 34px 0 11px;
  border: 1px solid #d4d4d4;
  border-radius: 0;
  outline: none;
  color: #303030;
  background-color: #ffffff;
  background-image: linear-gradient(45deg, transparent 50%, #777777 50%), linear-gradient(135deg, #777777 50%, transparent 50%);
  background-position: calc(100% - 16px) 16px, calc(100% - 12px) 16px;
  background-repeat: no-repeat;
  background-size: 4px 4px, 4px 4px;
  appearance: none;
  font-size: 12px;
  transition: border-color 150ms ease;
}

.field select:focus {
  border-color: var(--accent);
}

.add-button {
  display: flex;
  width: 100%;
  height: 43px;
  margin-top: 6px;
  padding: 0 13px;
  align-items: center;
  justify-content: space-between;
  border: 1px solid var(--accent);
  color: var(--night);
  background: var(--accent);
  cursor: pointer;
  font-size: 12px;
  font-weight: 700;
  transition: background 150ms ease;
}

.add-button:hover {
  background: #0f365d;
}

.control-status {
  min-height: 31px;
  margin: 7px 0 0;
  color: #6a6a6a;
  font-size: 10px;
  line-height: 1.45;
}

.control-status.is-error {
  color: #444444;
}

.dataset-note {
  display: flex;
  margin-top: auto;
  padding-top: 20px;
  align-items: flex-start;
  gap: 10px;
  border-top: 1px solid #dddddd;
}

.dataset-note div {
  display: flex;
  flex-direction: column;
}

.dataset-note strong {
  color: #4f4f4f;
  font-size: 10px;
  font-weight: 650;
}

.dataset-note span:not(.live-pulse) {
  margin-top: 2px;
  color: #838383;
  font-size: 9px;
  line-height: 1.4;
}

.live-pulse {
  width: 6px;
  height: 6px;
  margin-top: 5px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(0, 0, 0, 0.1);
}

.chart-panel {
  display: flex;
  min-width: 0;
  flex-direction: column;
  background: #ffffff;
}

.chart-toolbar {
  display: flex;
  min-height: 65px;
  padding: 12px 18px 11px 23px;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--night-line);
}

.chart-toolbar > div:first-child {
  display: flex;
  align-items: center;
  gap: 13px;
}

.chart-toolbar .toolbar-label {
  margin: 0;
}

.segmented-control {
  display: flex;
  border: 1px solid #d4d4d4;
}

.segmented-control button,
.toolbar-actions button {
  border: 0;
  color: #6e6e6e;
  background: transparent;
  cursor: pointer;
  font-size: 10px;
}

.segmented-control button {
  min-width: 55px;
  height: 28px;
}

.segmented-control button.active {
  color: #242424;
  background: #e8e8e8;
}

.toolbar-actions {
  display: flex;
  gap: 4px;
}

.toolbar-actions button {
  padding: 7px 8px;
}

.toolbar-actions button:hover {
  color: #333333;
}

.chart-wrap {
  position: relative;
  min-height: 505px;
  padding: 10px 16px 0 4px;
  overflow: hidden;
}

#pareto-chart {
  display: block;
  width: 100%;
  height: auto;
  min-height: 470px;
  overflow: visible;
}

.chart-loading,
.chart-empty {
  position: absolute;
  z-index: 3;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #707070;
  background: rgba(255, 255, 255, 0.9);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.02em;
}

.chart-loading[hidden] {
  display: none;
}

.chart-loading span {
  width: 11px;
  height: 11px;
  margin-right: 10px;
  border: 1px solid #cdcdcd;
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 800ms linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.grid-line {
  stroke: #e7e7e7;
  stroke-width: 1;
}

.axis-line {
  stroke: #a3a3a3;
  stroke-width: 1;
}

.axis-tick {
  fill: #707070;
  font-family: var(--mono);
  font-size: 10px;
}

.axis-label {
  fill: #555555;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.02em;
}

.frontier-path {
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  opacity: 0.86;
  transition: opacity 120ms ease, stroke-width 120ms ease;
}

.frontier-path.is-muted,
.frontier-point.is-muted {
  opacity: 0.08;
}

.frontier-path.is-focused {
  stroke-width: 3;
  opacity: 1;
}

.frontier-point {
  stroke-width: 1.7;
  cursor: crosshair;
  transition: r 100ms ease, opacity 120ms ease;
}

.frontier-point:hover,
.frontier-point.is-focused {
  r: 6px;
  stroke-width: 2.8;
}

.tooltip {
  position: absolute;
  z-index: 8;
  width: min(310px, calc(100% - 24px));
  padding: 14px 15px 13px;
  border: 1px solid var(--accent);
  color: #f7f7f7;
  background: rgba(23, 74, 126, 0.98);
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.22);
  pointer-events: none;
}

.tooltip[hidden] {
  display: none;
}

.tooltip-title {
  margin-bottom: 8px;
  padding-bottom: 8px;
  border-bottom: 1px solid #5f5f5f;
  font-size: 11px;
  font-weight: 680;
  line-height: 1.45;
}

.tooltip-title span {
  display: block;
  margin-top: 2px;
  color: #c9c9c9;
  font-family: var(--mono);
  font-size: 9px;
  font-weight: 400;
}

.tooltip-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  column-gap: 16px;
  row-gap: 6px;
}

.tooltip-item {
  display: flex;
  flex-direction: column;
  line-height: 1.35;
}

.tooltip-item span {
  color: #bdbdbd;
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.tooltip-item strong {
  color: #f7f7f7;
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 500;
}

.tooltip-item.wide {
  grid-column: 1 / -1;
}

.series-area {
  min-height: 145px;
  padding: 16px 22px 20px;
  border-top: 1px solid var(--night-line);
}

.series-heading {
  display: flex;
  margin-bottom: 11px;
  align-items: center;
  justify-content: space-between;
  color: #6e6e6e;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.series-list {
  display: flex;
  max-height: 103px;
  overflow-y: auto;
  flex-wrap: wrap;
  align-content: flex-start;
  gap: 7px;
  scrollbar-color: #c5c5c5 transparent;
  scrollbar-width: thin;
}

.series-chip {
  display: inline-flex;
  height: 31px;
  padding: 0 5px 0 9px;
  align-items: center;
  gap: 7px;
  border: 1px solid #d8d8d8;
  color: #555555;
  background: #fafafa;
  font-size: 9px;
  white-space: nowrap;
  transition: border-color 120ms ease, opacity 120ms ease;
}

.series-chip:hover,
.series-chip.is-focused {
  border-color: var(--accent);
}

.series-chip.is-hidden {
  opacity: 0.42;
}

.series-swatch {
  display: block;
  width: 14px;
  height: 2px;
  flex: 0 0 auto;
}

.series-marker {
  display: inline-flex;
  width: 10px;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  font-family: var(--sans);
  font-size: 10px;
  font-style: normal;
  line-height: 1;
}

.series-toggle,
.series-remove {
  display: flex;
  padding: 0;
  align-items: center;
  border: 0;
  color: inherit;
  background: transparent;
  cursor: pointer;
}

.series-toggle {
  gap: 7px;
}

.series-remove {
  width: 20px;
  height: 20px;
  justify-content: center;
  color: #888888;
  font-size: 14px;
}

.series-remove:hover {
  color: #333333;
}

.explorer-footnote {
  max-width: 840px;
  margin: 20px 0 0 auto;
  color: #777777;
  font-size: 11px;
  line-height: 1.6;
}

.citation-section {
  padding-top: 72px;
  padding-bottom: 88px;
}

.citation-section .section-content > p {
  margin-top: 17px;
}

.citation-box {
  position: relative;
  margin-top: 31px;
  border: 1px solid #dedede;
  background: #f6f6f6;
}

.citation-box pre {
  margin: 0;
  padding: 27px 180px 27px 28px;
  overflow-x: auto;
  color: #444444;
  font-family: var(--mono);
  font-size: 11px;
  line-height: 1.7;
}

.copy-button {
  position: absolute;
  top: 16px;
  right: 16px;
  display: flex;
  min-width: 124px;
  height: 38px;
  padding: 0 12px;
  align-items: center;
  justify-content: center;
  border: 1px solid #d2d2d2;
  color: #444444;
  background: #ffffff;
  cursor: pointer;
  font-size: 10px;
  font-weight: 650;
}

.copy-button:hover {
  border-color: var(--accent);
}

@media (max-width: 960px) {
  .content-section {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 40px;
  }

  .explorer-shell {
    grid-template-columns: 220px minmax(0, 1fr);
  }

  .metric-key {
    display: none;
  }

  .chart-wrap {
    min-height: 430px;
  }

  #pareto-chart {
    min-height: 400px;
  }
}

@media (max-width: 760px) {
  .hero {
    padding: 88px 22px 52px;
  }

  .hero h1 {
    letter-spacing: -0.052em;
  }

  .title-line {
    white-space: normal;
  }

  .content-section {
    width: calc(100vw - 40px);
    padding: 58px 0 64px;
    grid-template-columns: 1fr;
    gap: 25px;
  }

  .explorer-section {
    padding: 58px 20px 52px;
  }

  .citation-section {
    padding-top: 58px;
    padding-bottom: 68px;
  }

  .explorer-heading {
    margin-top: 20px;
  }

  .explorer-shell {
    grid-template-columns: 1fr;
  }

  .controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    column-gap: 12px;
    border-right: 0;
    border-bottom: 1px solid var(--night-line);
  }

  .controls-heading,
  .dataset-note {
    grid-column: 1 / -1;
  }

  .add-button {
    height: 39px;
    margin-top: 21px;
  }

  .control-status {
    margin-top: 22px;
  }

  .dataset-note {
    margin-top: 5px;
  }

  .chart-wrap {
    min-height: 370px;
    overflow-x: auto;
  }

  #pareto-chart {
    width: 720px;
    min-height: 390px;
  }

  .citation-box pre {
    padding: 78px 22px 25px;
    font-size: 9px;
  }

  .copy-button {
    top: 17px;
    right: auto;
    left: 20px;
  }

}

@media (max-width: 480px) {
  .hero-actions {
    width: 100%;
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .controls {
    display: block;
  }

  .add-button {
    margin-top: 7px;
  }

  .control-status {
    margin-top: 8px;
  }

  .chart-toolbar {
    align-items: end;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}