:root {
  --ui-ink: var(--color-neutral-solid-gray-900);
  --ui-muted: var(--color-neutral-solid-gray-600);
  --ui-surface: var(--color-neutral-white);
  --ui-panel: var(--color-neutral-solid-gray-50);
  --ui-stage: var(--color-neutral-solid-gray-100);
  --ui-key: var(--color-key-900);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  background: var(--ui-surface);
}

body {
  margin: 0;
  background: var(--ui-surface);
  color: var(--ui-ink);
  font-family: var(--font-family-sans);
  font-size: 16px;
  line-height: 1.7;
  letter-spacing: 0.02em;
}

h1,
h2,
h3,
p,
figure,
fieldset {
  margin: 0;
}

fieldset {
  border: 0;
  padding: 0;
}

button,
input {
  font: inherit;
}

button,
input,
[tabindex] {
  scroll-margin-top: 96px;
}

[hidden] {
  display: none !important;
}

.svg-defs {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.app {
  max-width: 1440px;
  margin: 0 auto;
  padding: 32px 24px;
}

/* ---------- masthead ---------- */

.masthead {
  margin-bottom: 24px;
}

.masthead__title {
  font-size: clamp(26px, 3.2vw, 32px);
  line-height: 1.35;
  letter-spacing: 0.01em;
}

.masthead__lead {
  max-width: none;
  margin-top: 10px;
  color: var(--color-neutral-solid-gray-700);
  font-size: 18px;
  line-height: 1.7;
}

.noscript {
  margin-bottom: 24px;
  padding: 16px 20px;
  border-radius: 12px;
  background: var(--color-primitive-red-50);
  color: var(--color-primitive-red-900);
  font-weight: 700;
}

main {
  display: flex;
  flex-direction: column;
  gap: 24px;
  min-width: 0;
}

main > * {
  min-width: 0;
}

/* ---------- controls ---------- */

.layout {
  display: grid;
  gap: 24px;
  min-width: 0;
}

.layout__inputs,
.layout__results {
  display: grid;
  gap: 16px;
  min-width: 0;
}

.panel {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 20px;
  border: 1px solid var(--color-neutral-solid-gray-420);
  border-radius: 16px;
  background: var(--ui-panel);
}

.panel__head {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.panel__title {
  letter-spacing: 0.02em;
}

.panel__note {
  color: var(--ui-muted);
  font-size: 16px;
  line-height: 1.6;
}

.color-fields {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.color-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.color-field__label {
  color: var(--color-neutral-solid-gray-800);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
}

.color-field__controls {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  min-width: 0;
}

.color-well {
  flex: 0 0 auto;
  width: 48px;
  height: 48px;
  padding: 4px;
  border: 2px solid var(--color-neutral-solid-gray-600);
  border-radius: 10px;
  background: var(--color-neutral-white);
  cursor: pointer;
}

.color-well::-webkit-color-swatch-wrapper {
  padding: 0;
}

.color-well::-webkit-color-swatch {
  border: 0;
  border-radius: 5px;
}

.color-well::-moz-color-swatch {
  border: 0;
  border-radius: 5px;
}

.color-well:focus-visible {
  outline: 4px solid var(--color-neutral-black);
  outline-offset: 2px;
  box-shadow: 0 0 0 2px var(--color-primitive-yellow-300);
}

.color-field__hex {
  flex: 1 1 auto;
  min-width: 0;
}

.color-field__hex .dads-input-text__input {
  width: 100%;
  border-width: 2px;
  padding: 10px 12px;
  font-family: var(--font-family-mono);
  font-size: 16px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.color-field__hex .dads-input-text__input[aria-invalid="true"] {
  border-color: var(--color-semantic-error-1);
  background: var(--color-primitive-red-50);
}

.field-error {
  margin-top: 6px;
  color: var(--color-primitive-red-900);
  font-size: 16px;
  line-height: 1.4;
}

/* ---------- verdict ---------- */

.verdict {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 20px;
  border: 1px solid var(--color-neutral-solid-gray-420);
  border-radius: 16px;
  background: var(--ui-stage);
  color: var(--ui-ink);
}

.verdict__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 4px;
}

.verdict__kicker {
  color: inherit;
  letter-spacing: 0.04em;
}

.verdict__badge {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 2px 10px;
  border-radius: 999px;
  background: var(--color-neutral-solid-gray-700);
  color: var(--color-neutral-white);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.2;
  white-space: nowrap;
}

.verdict__ratio {
  font-size: clamp(42px, 4.4vw, 54px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.verdict__unit {
  margin-left: 2px;
  font-size: 0.48em;
  font-weight: 700;
  letter-spacing: 0;
}

.verdict__desc {
  font-size: 16px;
  line-height: 1.5;
}

.verdict[data-state="pass"] {
  background: var(--color-primitive-green-50);
  color: var(--color-primitive-green-900);
}

.verdict[data-state="pass"] .verdict__badge {
  background: var(--color-primitive-green-800);
}

.verdict[data-state="fail"] {
  background: var(--color-primitive-orange-50);
  color: var(--color-primitive-orange-900);
}

.verdict[data-state="fail"] .verdict__badge {
  background: var(--color-primitive-orange-800);
}

.verdict[data-state="same"] {
  background: var(--color-neutral-solid-gray-100);
  color: var(--color-neutral-solid-gray-900);
}

.verdict[data-state="same"] .verdict__badge {
  background: var(--color-neutral-solid-gray-700);
}

.verdict[data-state="invalid"] {
  background: var(--color-primitive-red-50);
  color: var(--color-neutral-solid-gray-900);
}

.verdict[data-state="invalid"] .verdict__badge {
  background: var(--color-primitive-red-800);
}

.verdict[data-state="invalid"] .verdict__ratio {
  display: none;
}

.verdict[data-state="pending"] {
  background: var(--color-neutral-solid-gray-100);
  color: var(--color-neutral-solid-gray-900);
}

.verdict[data-state="pending"] .verdict__badge {
  background: var(--color-neutral-solid-gray-700);
}

.verdict[data-state="pending"] .verdict__ratio {
  display: none;
}

/* ---------- simulation controls ---------- */

.radio-row {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  align-items: center;
}

.dads-radio {
  cursor: pointer;
}

.dads-radio__label {
  font-size: 16px;
  line-height: 1.3;
}

/* ---------- compare ---------- */

.compare {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
}

.compare__tools {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 32px;
  padding: 0;
}

.compare__group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 16px;
}

.compare__legend {
  padding: 0;
  color: var(--color-neutral-solid-gray-800);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
}

.compare__warning {
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--color-primitive-red-50);
  color: var(--color-primitive-red-900);
  font-size: 16px;
  line-height: 1.5;
}


.compare__stage {
  padding: 16px;
  background: var(--ui-stage);
  min-width: 0;
}

.compare__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  min-width: 0;
}

@media (min-width: 1280px) {
  .compare__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (max-width: 720px) {
  .compare__grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

.col {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
  scroll-snap-align: start;
}

.col__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 4px 12px;
}

.col__label {
  display: flex;
  align-items: center;
  gap: 8px;
}

.col__index {
  display: inline-grid;
  place-items: center;
  flex: 0 0 auto;
  width: 26px;
  height: 26px;
  border-radius: 4px;
  background: var(--color-neutral-solid-gray-800);
  color: var(--color-neutral-white);
  font-size: 16px;
  font-weight: 700;
  line-height: 1;
}

.col__title {
  color: var(--color-neutral-solid-gray-900);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0;
}

.col__note {
  color: var(--ui-muted);
  font-size: 16px;
  line-height: 1.4;
  letter-spacing: 0;
}

.col__sample {
  position: relative;
  overflow: hidden;
  height: 340px;
  background: var(--z1, var(--color-neutral-white));
}

.col__caption {
  color: var(--ui-muted);
  font-size: 16px;
  line-height: 1.4;
  letter-spacing: 0;
}

/* ---------- sample (DADS is deliberately not applied here) ---------- */

.scene {
  position: absolute;
  inset: -16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  height: auto;
  padding: 26px;
  background: var(--z1, #ffffff);
  color: var(--ink-base, #000000);
  font-family: var(--font-family-sans);
}

.scene__base {
  flex: 0 0 auto;
}


.scene__eyebrow {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.08em;
}

.scene__title {
  margin-top: 10px;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: 0;
}

.scene__body {
  margin-top: 6px;
  font-size: 16px;
  line-height: 1.5;
  letter-spacing: 0;
  overflow-wrap: anywhere;
}

.scene__after {
  flex: 0 0 auto;
  font-size: 16px;
  line-height: 1.5;
  letter-spacing: 0;
  overflow-wrap: anywhere;
}

.scene__card {
  position: relative;
  display: flex;
  flex: 0 0 auto;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  padding: 16px 18px;
  border: 1px solid transparent;
  border-radius: 18px;
  background: var(--z1, #ffffff);
  color: var(--ink-fill, #000000);
}

.compare__grid[data-border="on"] .scene__card {
  border-color: var(--color-neutral-solid-gray-600);
}

.scene__fill {
  position: absolute;
  inset: 0;
  z-index: 0;
  display: block;
  border-radius: inherit;
  background: var(--z2, #f2f2f2);
}

.scene__card > :not(.scene__fill) {
  position: relative;
  z-index: 1;
}

.scene__card-title {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0;
}

.scene__card-text {
  font-size: 16px;
  line-height: 1.5;
  letter-spacing: 0;
  overflow-wrap: anywhere;
}

.scene__card-link {
  margin-top: 2px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0;
}

/* ---------- concept ---------- */

.concept {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--color-neutral-solid-gray-300);
}

.concept__text {
  max-width: 94ch;
  color: var(--ui-muted);
  font-size: 16px;
  line-height: 1.7;
}

/* ---------- responsive ---------- */

@media (min-width: 1081px) {
  .col__sample {
    height: 300px;
  }

  .layout {
    grid-template-columns: minmax(340px, 460px) minmax(0, 1fr);
    column-gap: 24px;
    align-items: stretch;
  }

  .verdict {
    display: grid;
    grid-template-columns: minmax(0, auto) minmax(0, 1fr);
    grid-template-areas:
      "top top"
      "ratio desc";
    align-content: center;
    gap: 8px 32px;
  }

  .verdict__top {
    grid-area: top;
    margin-bottom: 0;
  }

  .verdict__ratio {
    grid-area: ratio;
  }

  .verdict__desc {
    grid-area: desc;
    align-self: end;
  }
}


@media (max-width: 720px) {
  .app {
    padding: 32px 16px;
  }

  .compare__stage {
    padding: 12px;
  }
}

@media (max-width: 520px) {
  .app {
    padding-top: 26px;
  }

  .masthead__title {
    font-size: 28px;
  }

  .panel,
  .verdict {
    padding: 20px;
  }

  .color-fields {
    grid-template-columns: minmax(0, 1fr);
  }

  .verdict__ratio {
    font-size: 52px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
  }
}