:root {
  --page: #ffffff;
  --text: #111111;
  --muted: #5f6368;
  --line: #d9dee3;
  --soft-line: #eceff2;
  --soft-fill: #f7f8fa;
  --blue: #1f5fbf;
  --blue-dark: #16498f;
  --orange: #d97917;
  --code-bg: #101418;
  --code-text: #eef2f7;
  --max-width: 1120px;
  --radius: 0px;
}

* { box-sizing: border-box; }
html { min-height: 100%; background: var(--page); }
body {
  margin: 0;
  color: var(--text);
  background: var(--page);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 15px;
  line-height: 1.55;
}

a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
button, select { font: inherit; }

.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.96);
  position: sticky;
  top: 0;
  z-index: 20;
}
.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.wordmark {
  font-size: 17px;
  font-weight: 760;
  letter-spacing: 0;
  color: var(--text);
  white-space: nowrap;
}
.nav-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
  font-size: 14px;
}
.nav-links a {
  color: var(--text);
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}
.nav-links a.external {
  display: inline-flex;
  align-items: center;
  column-gap: 4px;
  white-space: nowrap;
}
.nav-brand-icon {
  width: 15px;
  height: 15px;
  flex: 0 0 auto;
}
.nav-brand-icon-hugging-face {
  width: 16px;
}
.nav-links a.active,
.nav-links a:hover {
  color: var(--blue);
  text-decoration: none;
  border-bottom-color: var(--blue);
}
.nav-links a.external::after {
  content: "↗";
  font-size: 10px;
  line-height: 1;
  color: var(--muted);
}

.main-shell {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 56px 24px 96px;
}
.hero {
  padding: 18px 0 46px;
  border-bottom: 1px solid var(--line);
}
.hero h1,
.page-title {
  font-size: clamp(38px, 6vw, 68px);
  line-height: 0.96;
  letter-spacing: 0;
  margin: 0 0 28px;
  max-width: 980px;
}
.hero p,
.page-subtitle {
  font-size: clamp(17px, 2.1vw, 22px);
  line-height: 1.42;
  max-width: 880px;
  color: #2e3135;
  margin: 0 0 16px;
}
.section {
  padding: 56px 0 0;
}
.section + .section {
  margin-top: 12px;
}
.section-header {
  border-top: 1px solid var(--line);
  padding-top: 30px;
  margin-bottom: 24px;
}
.first-home-section {
  padding-top: 28px;
}
.first-home-section .section-header {
  border-top: 0;
  padding-top: 0;
}
.section h2,
.detail-title h2 {
  font-size: clamp(26px, 3vw, 40px);
  line-height: 1.05;
  letter-spacing: 0;
  margin: 0 0 10px;
}
.section h3,
.panel h3 {
  font-size: 20px;
  letter-spacing: 0;
  margin: 0 0 10px;
}
.section p { color: #30353a; }
.muted { color: var(--muted); }
.small { font-size: 13px; }

.ball-drop-section {
  padding-top: 18px;
}
.ball-drop-gif {
  display: block;
  width: 100%;
  height: auto;
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.stat-cell {
  padding: 22px 24px 20px 0;
  min-height: 110px;
}
.stat-cell + .stat-cell {
  border-left: 1px solid var(--soft-line);
  padding-left: 24px;
}
.stat-value {
  display: block;
  font-size: clamp(22px, 2.5vw, 30px);
  font-weight: 760;
  letter-spacing: 0;
  line-height: 1.04;
  margin-bottom: 8px;
}
.stat-meaning {
  display: block;
  color: var(--muted);
  font-size: 14px;
}

.panel {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 24px 0;
  background: var(--page);
}
.panel + .panel { margin-top: 28px; }
.flat-panel {
  border: 1px solid var(--line);
  background: var(--page);
  padding: 22px;
}

.control-stack {
  display: grid;
  gap: 9px;
  margin-bottom: 18px;
}
.control-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}
.control-label {
  width: 74px;
  color: var(--muted);
  font-size: 13px;
}
.signal-hint {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  margin: 2px 0 12px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.2;
  background: #fff;
}
.plot-noise-cue {
  margin: -2px 0 12px;
  color: var(--muted);
  font-size: 13px;
}
.toggle-button,
.copy-button,
.compare-button,
.reveal-button {
  appearance: none;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--text);
  border-radius: var(--radius);
  padding: 6px 10px;
  line-height: 1.2;
  cursor: pointer;
}
.toggle-button:hover,
.copy-button:hover,
.compare-button:hover,
.reveal-button:hover {
  border-color: var(--blue);
  color: var(--blue);
}
.toggle-button.active,
.compare-button.active {
  border-color: var(--blue);
  color: #fff;
  background: var(--blue);
}
.reveal-button {
  margin-top: 16px;
  border-color: var(--blue);
  color: var(--blue);
}
.reveal-answer {
  margin-top: 14px;
  padding: 14px 16px;
  border-left: 3px solid var(--orange);
  background: #fff8ef;
}

.plot-wrap {
  border: 1px solid var(--line);
  background: #fff;
  width: 100%;
  overflow: hidden;
}
.plotly-wrap {
  min-height: 430px;
}
.plotly-host {
  width: 100%;
  min-height: 430px;
}
.plot-svg {
  width: 100%;
  display: block;
  min-height: 310px;
}
.plot-axis { stroke: #c8cdd2; stroke-width: 1; }
.plot-grid { stroke: #eef1f4; stroke-width: 1; }
.plot-line { fill: none; stroke-width: 2.1; vector-effect: non-scaling-stroke; }
.plot-line.primary { stroke: var(--blue); }
.plot-line.secondary { stroke: #6c757d; }
.plot-line.tertiary { stroke: var(--orange); }
.plot-label { font-size: 13px; fill: #33383d; }
.plot-tick { font-size: 11px; fill: #697078; }
.intervention-line { stroke: var(--orange); stroke-width: 2; stroke-dasharray: 6 5; vector-effect: non-scaling-stroke; }
.noise-band { fill: #dbe8fb; opacity: 0.48; }

.prompt-panel {
  margin-top: 16px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 18px 0;
}
.prompt-panel pre,
.code-block {
  margin: 0;
  white-space: pre-wrap;
  overflow-x: auto;
  line-height: 1.45;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 13px;
}
.prompt-panel pre { color: #24292f; }

.feature-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-item {
  border-top: 1px solid var(--line);
  padding-top: 18px;
}
.feature-item strong {
  display: block;
  font-size: 18px;
  letter-spacing: 0;
  margin-bottom: 8px;
}
.feature-item p { margin: 0; color: #3c4248; }

.toolbar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  align-items: end;
  border-top: 1px solid var(--line);
  padding-top: 22px;
  margin: 26px 0 18px;
}
.selector-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(120px, 1fr));
  gap: 12px;
}
.field label {
  display: block;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 5px;
}
.field select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  padding: 8px 9px;
  color: var(--text);
}
.compare-area {
  display: flex;
  justify-content: flex-end;
  align-items: end;
  gap: 10px;
}
.compare-selectors {
  grid-column: 1 / -1;
  border-top: 1px dashed var(--line);
  padding-top: 15px;
}

.table-wrap {
  overflow-x: auto;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
th, td {
  text-align: left;
  padding: 12px 11px;
  border-bottom: 1px solid var(--soft-line);
  vertical-align: top;
}
th {
  font-weight: 680;
  color: #23262a;
  white-space: nowrap;
  background: #fff;
}
th button {
  border: 0;
  background: transparent;
  color: inherit;
  padding: 0;
  cursor: pointer;
  font-weight: inherit;
}
tbody tr.clickable-row { cursor: pointer; }
tbody tr.clickable-row:hover { background: var(--soft-fill); }
tbody tr:last-child td { border-bottom: 0; }
.score-cell { font-variant-numeric: tabular-nums; font-weight: 720; }
.score-compare { color: var(--muted); font-weight: 520; }
.badge {
  display: inline-block;
  border: 1px solid var(--line);
  padding: 2px 7px;
  font-size: 12px;
  color: #3c4248;
  margin: 2px 3px 2px 0;
}
.badge.ok { border-color: #90c39f; color: #226b35; background: #f4fbf6; }
.badge.warn { border-color: #e1bf84; color: #86530b; background: #fff9ef; }

.detail-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 360px);
  gap: 28px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 28px;
  margin-bottom: 26px;
}
.meta-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 20px;
}
.meta-item span {
  display: block;
  font-size: 12px;
  color: var(--muted);
}
.meta-item strong {
  display: block;
  font-size: 15px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 28px;
}
.env-card {
  aspect-ratio: 1 / 1;
  border: 1px solid var(--line);
  padding: 22px;
  color: var(--text);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: #fff;
}
.env-card:hover {
  text-decoration: none;
  border-color: var(--blue);
}
.env-card strong {
  font-size: 24px;
  letter-spacing: 0;
}
.env-card p {
  margin: 18px 0 0;
  color: var(--muted);
}
.env-card-artwork {
  display: block;
  width: 100%;
  height: 132px;
  object-fit: contain;
}
.env-card span {
  color: var(--blue);
  font-size: 14px;
}

.code-shell {
  border: 1px solid var(--line);
  margin: 26px 0;
}
.code-shell-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--line);
  padding: 10px 12px;
  color: var(--muted);
  font-size: 13px;
}
.code-block {
  padding: 20px;
  background: #fbfcfd;
  color: #16191d;
}
.dark-code .code-block {
  background: var(--code-bg);
  color: var(--code-text);
}
.flow-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 22px;
}
.flow-item {
  border-top: 1px solid var(--line);
  padding-top: 14px;
}
.flow-item strong { display: block; margin-bottom: 6px; }
.contact-row {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  margin-top: 12px;
}
.error-box {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 24px 0;
}

@media (max-width: 860px) {
  .header-inner {
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
  }
  .nav-links { gap: 13px; }
  .main-shell { padding-top: 36px; }
  .stats-row,
  .feature-list,
  .card-grid,
  .flow-list,
  .detail-header {
    grid-template-columns: 1fr;
  }
  .stat-cell + .stat-cell {
    border-left: 0;
    border-top: 1px solid var(--soft-line);
    padding-left: 0;
  }
  .toolbar {
    grid-template-columns: 1fr;
    align-items: start;
  }
  .selector-grid {
    grid-template-columns: repeat(2, minmax(120px, 1fr));
  }
  .compare-area { justify-content: flex-start; }
  .env-card { aspect-ratio: auto; min-height: 300px; }
  .env-card-artwork { height: 150px; }
}

@media (max-width: 560px) {
  body { font-size: 14px; }
  .selector-grid { grid-template-columns: 1fr; }
  .control-label { width: 100%; }
  th, td { padding: 10px 8px; }
  .meta-grid { grid-template-columns: 1fr; }
}