:root {
  --bg: #f6f8f5;
  --body-gradient-start: #eef4ee;
  --body-gradient-end: #f6f8f5;
  --surface: #ffffff;
  --surface-soft: #eef3ef;
  --surface-raised: #fbfcfb;
  --surface-control: #f6f8f6;
  --ink: #14211d;
  --ink-strong: #26362f;
  --ink-soft: #34433c;
  --muted: #64716b;
  --line: #d7ded8;
  --line-strong: #aebbb2;
  --green: #1f8a62;
  --green-dark: #16674c;
  --green-soft: #eef7f2;
  --blue: #2f6fb7;
  --blue-soft: #dbe8f6;
  --amber: #d9822b;
  --amber-soft: #f4e3ce;
  --red: #b42318;
  --red-soft: #f7d8d6;
  --header-bg: #10231f;
  --header-ink: #f7fbf8;
  --header-muted: #dce8e1;
  --header-kicker: #afc6bb;
  --claim-bg: rgba(247, 251, 248, 0.06);
  --claim-border: rgba(247, 251, 248, 0.18);
  --claim-ink: #f3faf5;
  --button-bg: #ffffff;
  --matrix-head: #f4f7f4;
  --best-row: #edf7f1;
  --canvas-bg: #fbfcfb;
  --shadow: 0 18px 48px rgba(28, 42, 36, 0.09);
  --radius: 8px;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #111816;
  --body-gradient-start: #15231f;
  --body-gradient-end: #111816;
  --surface: #18221f;
  --surface-soft: #22302b;
  --surface-raised: #1d2925;
  --surface-control: #131d1a;
  --ink: #eef6f1;
  --ink-strong: #f5faf7;
  --ink-soft: #c8d5ce;
  --muted: #9fb0a8;
  --line: #31423b;
  --line-strong: #536b61;
  --green: #40bd88;
  --green-dark: #61d49c;
  --green-soft: #183d31;
  --blue: #6fa6e6;
  --blue-soft: #1d3148;
  --amber: #efac5f;
  --amber-soft: #45301e;
  --red: #ef746b;
  --red-soft: #4a2524;
  --header-bg: #0b1714;
  --header-ink: #f7fbf8;
  --header-muted: #c8d8d0;
  --header-kicker: #9fcbb7;
  --claim-bg: rgba(238, 246, 241, 0.07);
  --claim-border: rgba(238, 246, 241, 0.18);
  --claim-ink: #f7fbf8;
  --button-bg: #1f2b27;
  --matrix-head: #202e29;
  --best-row: #17382d;
  --canvas-bg: #17211e;
  --shadow: 0 20px 52px rgba(0, 0, 0, 0.26);
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--bg);
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(180deg, var(--body-gradient-start) 0, var(--body-gradient-end) 280px),
    var(--bg);
  font-family: var(--sans);
  font-size: 15px;
  letter-spacing: 0;
}

button,
input,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.app-shell {
  min-height: 100vh;
}

.loading-state {
  display: grid;
  min-height: 100vh;
  place-items: center;
  color: var(--muted);
}

.lab-header {
  border-bottom: 1px solid rgba(20, 33, 29, 0.1);
  background: var(--header-bg);
  color: var(--header-ink);
}

.header-inner {
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(0, 1fr) auto;
  max-width: 1480px;
  margin: 0 auto;
  padding: 26px 28px 22px;
}

.kicker {
  margin: 0 0 8px;
  color: var(--header-kicker);
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
}

.lab-title {
  margin: 0;
  max-width: 820px;
  font-size: clamp(2rem, 4vw, 3.8rem);
  line-height: 0.98;
}

.lab-subtitle {
  max-width: 860px;
  margin: 14px 0 0;
  color: var(--header-muted);
  font-size: 1.02rem;
  line-height: 1.55;
}

.claim {
  align-self: end;
  max-width: 360px;
  border: 1px solid var(--claim-border);
  border-radius: var(--radius);
  padding: 16px;
  background: var(--claim-bg);
  color: var(--claim-ink);
  font-weight: 750;
  line-height: 1.35;
}

.header-side {
  display: grid;
  align-content: end;
  justify-items: end;
  gap: 12px;
}

.language-control {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--claim-border);
  border-radius: var(--radius);
  background: var(--claim-bg);
  padding: 8px;
}

.language-label {
  color: var(--header-kicker);
  font-size: 0.76rem;
  font-weight: 850;
  text-transform: uppercase;
}

.language-switch {
  display: grid;
  grid-template-columns: repeat(2, minmax(74px, 1fr));
  gap: 3px;
  border-radius: 7px;
  background: rgba(247, 251, 248, 0.08);
  padding: 3px;
}

.language-switch button {
  min-height: 30px;
  border: 0;
  border-radius: 5px;
  background: transparent;
  color: var(--header-muted);
  font-weight: 850;
}

.language-switch button.is-active {
  background: var(--header-ink);
  color: var(--header-bg);
}

.lab-main {
  display: grid;
  grid-template-columns: 360px minmax(0, 1fr);
  gap: 18px;
  max-width: 1480px;
  margin: 0 auto;
  padding: 18px 28px 34px;
}

.control-column,
.workspace {
  display: grid;
  align-content: start;
  gap: 14px;
}

.panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.panel-inner {
  padding: 16px;
}

.panel-head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.panel-title {
  margin: 0;
  font-size: 1rem;
  line-height: 1.25;
}

.panel-subtitle {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.45;
}

.intro-copy {
  margin: 0;
  color: var(--ink-soft);
  line-height: 1.55;
}

.example-text {
  margin: 12px 0 0;
  border-left: 3px solid var(--green);
  padding-left: 12px;
  color: var(--ink-soft);
  line-height: 1.45;
}

.level-list {
  display: grid;
  gap: 8px;
}

.level-card {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px;
  background: var(--surface-raised);
  color: inherit;
  text-align: left;
  transition: border-color 150ms ease, background 150ms ease, transform 150ms ease;
}

.level-card:hover {
  border-color: var(--line-strong);
  transform: translateY(-1px);
}

.level-card.is-active {
  border-color: var(--green);
  background: var(--green-soft);
}

.level-card.is-best {
  border-color: #91c9ae;
}

.level-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.level-name {
  font-weight: 750;
}

.level-badge {
  min-width: 42px;
  border-radius: 999px;
  padding: 3px 8px;
  background: var(--surface-soft);
  color: var(--muted);
  font-size: 0.74rem;
  font-weight: 700;
  text-align: center;
  white-space: nowrap;
}

.level-card.is-active .level-badge {
  background: var(--green);
  color: white;
}

.level-description,
.level-message {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.42;
}

.level-message {
  color: var(--ink-strong);
  font-weight: 680;
}

.field-stack {
  display: grid;
  gap: 14px;
}

.field {
  display: grid;
  gap: 7px;
}

.field-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  color: var(--ink-strong);
  font-size: 0.86rem;
  font-weight: 700;
}

.field-value {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.8rem;
}

.segmented {
  display: grid;
  grid-auto-columns: minmax(0, 1fr);
  grid-auto-flow: column;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-control);
  padding: 3px;
}

.segmented button {
  min-height: 32px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  font-weight: 700;
}

.segmented button.is-active {
  background: var(--surface);
  color: var(--ink);
  box-shadow: 0 1px 5px rgba(28, 42, 36, 0.11);
}

.range-control {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 70px;
  gap: 10px;
  align-items: center;
}

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

select,
.number-input {
  min-height: 36px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--button-bg);
  color: var(--ink);
  padding: 0 10px;
}

.number-input {
  width: 100%;
}

.action-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}

.button {
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--button-bg);
  color: var(--ink);
  font-weight: 750;
}

.button.primary {
  border-color: var(--green);
  background: var(--green);
  color: white;
}

.button.primary:hover {
  background: var(--green-dark);
}

.button.compare {
  grid-column: span 2;
  border-color: #224d7f;
  background: var(--blue);
  color: white;
}

.button.secondary {
  background: var(--surface-control);
}

.theme-toggle {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-raised);
  padding: 10px;
}

.theme-switch {
  position: relative;
  display: inline-grid;
  width: 118px;
  height: 34px;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface-control);
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 850;
}

.theme-switch input {
  position: absolute;
  inset: 0;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}

.theme-switch::before {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: calc(50% - 4px);
  height: calc(100% - 6px);
  border-radius: 999px;
  background: var(--surface);
  box-shadow: 0 1px 5px rgba(28, 42, 36, 0.16);
  transition: transform 160ms ease;
}

.theme-switch.is-dark::before {
  transform: translateX(calc(100% + 2px));
}

.theme-switch span {
  position: relative;
  z-index: 1;
  text-align: center;
  pointer-events: none;
}

.theme-switch .theme-light-label,
.theme-switch.is-dark .theme-dark-label {
  color: var(--ink);
}

.theme-switch.is-dark .theme-light-label {
  color: var(--muted);
}

.status-pill {
  display: inline-flex;
  min-width: 88px;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 5px 10px;
  background: var(--surface-soft);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
}

.status-pill.running {
  background: #e6f5ec;
  color: var(--green-dark);
}

.status-pill.preview {
  background: #e5eef8;
  color: #224d7f;
}

.toolbar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 14px;
  align-items: center;
}

.toolbar .panel-inner {
  display: grid;
  gap: 12px;
}

.dataset-summary {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: start;
}

.dataset-summary h2 {
  margin: 0;
  font-size: 1.28rem;
}

.dataset-summary p {
  margin: 6px 0 0;
  color: var(--muted);
  line-height: 1.45;
}

.summary-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.meta-chip {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 9px;
  background: var(--surface-raised);
  color: var(--ink-strong);
  font-size: 0.76rem;
  font-weight: 800;
  white-space: nowrap;
}

.visual-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.18fr) minmax(330px, 0.82fr);
  gap: 14px;
}

.canvas-wrap {
  position: relative;
  width: 100%;
}

.canvas-wrap.boundary {
  aspect-ratio: 1.28;
}

.canvas-wrap.network,
.canvas-wrap.loss {
  aspect-ratio: 1.82;
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--canvas-bg);
}

.stacked-panels {
  display: grid;
  gap: 14px;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}

.metric-tile {
  min-height: 72px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px;
  background: var(--surface-raised);
}

.metric-label {
  display: block;
  color: var(--muted);
  font-size: 0.74rem;
  font-weight: 800;
  line-height: 1.2;
}

.metric-value {
  display: block;
  margin-top: 7px;
  color: var(--ink);
  font-family: var(--mono);
  font-size: clamp(1rem, 2vw, 1.22rem);
  font-weight: 800;
}

.metric-help {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.45;
}

.matrix {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.84rem;
}

.matrix th,
.matrix td {
  border: 1px solid var(--line);
  padding: 8px;
  text-align: center;
}

.matrix th {
  background: var(--matrix-head);
  color: var(--ink-strong);
  font-weight: 800;
}

.matrix td {
  font-family: var(--mono);
  font-weight: 800;
}

.comparison-panel {
  overflow: hidden;
}

.table-scroll {
  overflow-x: auto;
}

.comparison-table {
  width: 100%;
  min-width: 840px;
  border-collapse: collapse;
  font-size: 0.86rem;
}

.comparison-table th,
.comparison-table td {
  border-top: 1px solid var(--line);
  padding: 10px 12px;
  text-align: right;
  white-space: nowrap;
}

.comparison-table th:first-child,
.comparison-table td:first-child {
  text-align: left;
}

.comparison-table th {
  background: var(--matrix-head);
  color: var(--ink-strong);
  font-size: 0.76rem;
  font-weight: 850;
  text-transform: uppercase;
}

.comparison-table tbody tr.best-row {
  background: var(--best-row);
}

.comparison-table tbody tr.best-row td:first-child {
  color: var(--green-dark);
  font-weight: 850;
}

.empty-row td {
  color: var(--muted);
  text-align: left;
}

.footer-note {
  max-width: 1480px;
  margin: 0 auto;
  padding: 0 28px 34px;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.5;
}

.error-panel {
  max-width: 720px;
  margin: 48px auto;
  border: 1px solid var(--red-soft);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 18px;
  color: var(--red);
}

body.preview-mode .lab-header .header-inner {
  padding-top: 18px;
  padding-bottom: 18px;
}

body.preview-mode .lab-title {
  font-size: clamp(1.85rem, 3.2vw, 3.1rem);
}

body.preview-mode .lab-subtitle {
  max-width: 760px;
  margin-top: 10px;
  font-size: 0.95rem;
}

body.preview-mode .claim {
  font-size: 0.94rem;
}

body.preview-mode .lab-main {
  grid-template-columns: 310px minmax(0, 1fr);
  padding-top: 14px;
  padding-bottom: 18px;
}

body.preview-mode .intro-panel,
body.preview-mode .footer-note,
body.preview-mode .metric-help {
  display: none;
}

body.preview-mode .panel-inner {
  padding: 12px;
}

body.preview-mode .dataset-summary {
  grid-template-columns: 1fr;
  gap: 8px;
}

body.preview-mode .summary-meta {
  justify-content: flex-start;
}

body.preview-mode .level-description {
  display: none;
}

body.preview-mode .visual-grid {
  grid-template-columns: minmax(0, 1.05fr) minmax(310px, 0.95fr);
}

body.preview-mode .canvas-wrap.boundary {
  aspect-ratio: 1.35;
}

body.preview-mode .canvas-wrap.network,
body.preview-mode .canvas-wrap.loss {
  aspect-ratio: 2.05;
}

body.preview-mode .metrics-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

body.preview-mode .comparison-table th,
body.preview-mode .comparison-table td {
  padding: 8px 10px;
}

@media (max-width: 1180px) {
  .header-inner,
  .lab-main {
    grid-template-columns: 1fr;
  }

  .header-side {
    justify-items: start;
  }

  .claim {
    max-width: none;
  }

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

@media (max-width: 780px) {
  .header-inner,
  .lab-main,
  .footer-note {
    padding-left: 14px;
    padding-right: 14px;
  }

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

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

  .dataset-summary {
    grid-template-columns: 1fr;
  }

  .summary-meta {
    justify-content: flex-start;
  }

  .segmented {
    grid-auto-flow: row;
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .point-filter .segmented {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}