:root {
  color-scheme: light dark;
  --surface-canvas: #fafafa;
  --surface-primary: #ffffff;
  --surface-secondary: #f4f4f5;
  --surface-inverse: #171717;
  --text-primary: #171717;
  --text-secondary: #52525b;
  --text-tertiary: #71717a;
  --text-on-inverse: #ffffff;
  --border-default: rgb(0 0 0 / 10%);
  --border-strong: rgb(0 0 0 / 20%);
  --accent-primary: #2563eb;
  --accent-surface: #eff6ff;
  --status-success: #15803d;
  --status-warning: #a16207;
  --status-error: #b91c1c;
  --shadow-ring: 0 0 0 1px var(--border-default);
  --shadow-panel: var(--shadow-ring), 0 2px 2px rgb(0 0 0 / 3%);
  --shadow-featured: var(--shadow-ring), 0 16px 48px rgb(0 0 0 / 6%);
  --radius-control: 0.5rem;
  --radius-panel: 0.75rem;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --content-width: 74rem;
  --font-sans: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --surface-canvas: #0b0b0c;
    --surface-primary: #141416;
    --surface-secondary: #1f1f22;
    --surface-inverse: #fafafa;
    --text-primary: #fafafa;
    --text-secondary: #b4b4bc;
    --text-tertiary: #92929b;
    --text-on-inverse: #171717;
    --border-default: rgb(255 255 255 / 14%);
    --border-strong: rgb(255 255 255 / 28%);
    --accent-primary: #60a5fa;
    --accent-surface: #172554;
    --status-success: #4ade80;
    --status-warning: #facc15;
    --status-error: #f87171;
    --shadow-panel: var(--shadow-ring), 0 2px 2px rgb(0 0 0 / 18%);
    --shadow-featured: var(--shadow-ring), 0 16px 48px rgb(0 0 0 / 24%);
  }
}

* {
  box-sizing: border-box;
}

html {
  min-width: 20rem;
  background: var(--surface-canvas);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-synthesis: none;
}

body {
  margin: 0;
  min-height: 100dvh;
  background: var(--surface-canvas);
}

button,
input {
  font: inherit;
}

button,
a,
input,
label {
  -webkit-tap-highlight-color: transparent;
}

a {
  color: var(--accent-primary);
  text-underline-offset: 0.2em;
}

:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  inset: var(--space-3) auto auto var(--space-3);
  z-index: 10;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-control);
  background: var(--surface-inverse);
  color: var(--text-on-inverse);
  transform: translateY(-200%);
}

.skip-link:focus {
  transform: translateY(0);
}

.shell {
  width: min(100% - 2rem, var(--content-width));
  margin-inline: auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 4rem;
}

.brand {
  color: var(--text-primary);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.eyebrow {
  margin: 0 0 var(--space-4);
  color: var(--text-tertiary);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.04em;
}

h1,
h2,
h3,
p {
  margin-block-start: 0;
}

p,
li,
dt,
dd,
.notice,
.helper {
  overflow-wrap: break-word;
  text-wrap: pretty;
  word-break: keep-all;
}

.headline-line {
  display: block;
}

.keep-together {
  white-space: nowrap;
}

h1 {
  max-width: 13ch;
  margin-block-end: var(--space-5);
  font-size: clamp(2.25rem, 6vw, 4.5rem);
  font-weight: 600;
  letter-spacing: -0.05em;
  line-height: 0.98;
  text-wrap: balance;
  word-break: keep-all;
}

h2 {
  margin-block-end: var(--space-3);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.25;
  word-break: keep-all;
}

h3 {
  margin-block-end: var(--space-2);
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.015em;
  line-height: 1.35;
}

.lede {
  max-width: 44rem;
  margin-block-end: 0;
  color: var(--text-secondary);
  font-size: 1.125rem;
  line-height: 1.6;
  word-break: keep-all;
}

.panel {
  border-radius: var(--radius-panel);
  background: var(--surface-primary);
  box-shadow: var(--shadow-panel);
}

.panel-pad {
  padding: clamp(var(--space-5), 4vw, var(--space-8));
}

.button {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border: 0;
  border-radius: var(--radius-control);
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1;
  text-decoration: none;
  transition: transform 120ms ease-out, background-color 160ms ease-in-out, color 160ms ease-in-out;
  touch-action: manipulation;
}

.button-primary {
  background: var(--surface-inverse);
  color: var(--text-on-inverse);
}

.button-secondary {
  background: var(--surface-primary);
  box-shadow: var(--shadow-ring);
  color: var(--text-primary);
}

.button-text {
  background: transparent;
  color: var(--text-primary);
  text-decoration: underline;
  text-underline-offset: 0.25em;
}

.button:hover {
  transform: translateY(-1px);
}

.button:active,
.button.qa-active {
  transform: translateY(0) scale(0.98);
}

.button:disabled,
.button[aria-disabled="true"] {
  cursor: not-allowed;
  opacity: 0.46;
  transform: none;
}

.field-group {
  margin: 0;
  padding: 0;
  border: 0;
}

.field-label,
.field-group legend {
  display: block;
  margin-block-end: var(--space-3);
  font-size: 0.875rem;
  font-weight: 600;
}

.segmented {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-1);
  padding: var(--space-1);
  border-radius: calc(var(--radius-control) + var(--space-1));
  background: var(--surface-secondary);
}

.segmented input {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  opacity: 0;
}

.segmented label {
  display: grid;
  min-height: 2.75rem;
  place-items: center;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-control);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 500;
  text-align: center;
  transition: background-color 160ms ease-in-out, color 160ms ease-in-out, box-shadow 160ms ease-in-out;
}

.segmented input:checked + label {
  background: var(--surface-primary);
  box-shadow: var(--shadow-ring);
  color: var(--text-primary);
}

.segmented input:not(:disabled) + label:hover {
  background: var(--accent-surface);
  box-shadow: inset 0 0 0 1px var(--accent-primary);
  color: var(--accent-primary);
}

.segmented input:checked + label:hover {
  background: var(--surface-primary);
  box-shadow: var(--shadow-ring);
  color: var(--text-primary);
}

.segmented input:focus-visible + label {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

.segmented input:disabled + label {
  cursor: not-allowed;
  opacity: 0.46;
}

.range-row {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

input[type="range"] {
  flex: 1;
  min-width: 0;
  min-height: 2.75rem;
  accent-color: var(--text-primary);
  cursor: pointer;
}

input[type="range"]:not(:disabled):hover {
  accent-color: var(--accent-primary);
}

.number-input {
  width: 5.5rem;
  min-height: 2.75rem;
  padding: var(--space-2) var(--space-3);
  border: 0;
  border-radius: var(--radius-control);
  background: var(--surface-primary);
  box-shadow: var(--shadow-ring);
  color: var(--text-primary);
  font-family: var(--font-mono);
  text-align: end;
}

.number-input[aria-invalid="true"] {
  box-shadow: 0 0 0 2px var(--status-error);
}

input[type="range"][aria-invalid="true"] {
  accent-color: var(--status-error);
}

input[type="range"]:disabled,
.number-input:disabled {
  cursor: not-allowed;
  opacity: 0.46;
}

.helper {
  margin: var(--space-2) 0 0;
  color: var(--text-tertiary);
  font-size: 0.875rem;
  line-height: 1.5;
}

.notice {
  padding: var(--space-4);
  border-radius: var(--radius-control);
  background: var(--accent-surface);
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.5;
}

.notice-warning {
  box-shadow: inset 3px 0 0 var(--status-warning);
}

.notice-error {
  box-shadow: inset 3px 0 0 var(--status-error);
}

[hidden] {
  display: none !important;
}

@media (max-width: 27rem) {
  .segmented {
    grid-template-columns: 1fr;
  }

  .range-row {
    align-items: stretch;
    flex-direction: column;
  }

  .number-input {
    width: 100%;
    text-align: start;
  }
}

@media (min-width: 48rem) {
  .shell {
    width: min(100% - 3rem, var(--content-width));
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation: none !important;
    transition: none !important;
  }

  .button:hover,
  .button:active,
  .button.qa-active {
    transform: none;
  }
}