:root {
  --paper: #f2f2ef;
  --paper-bright: #fafaf8;
  --ink: #171a1d;
  --muted: #62676b;
  --line: #c8cbcc;
  --line-dark: #8d9295;
  --dial: #15191c;
  --dial-soft: #252a2e;
  --steel: #d7dadb;
  --steel-dark: #73797d;
  --cobalt: #1645b8;
  --cobalt-dark: #0c318c;
  --on-dark: #f5f6f5;
  --dial-muted: #adb3b7;
  --shadow-instrument: 12px 22px 48px rgba(7, 10, 12, 0.22);
  --header-height: 82px;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background: var(--paper);
  font-family: "Avenir Next", Avenir, "Segoe UI", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
}

button,
input {
  font: inherit;
}

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

button {
  color: inherit;
}

button:focus-visible,
a:focus-visible,
input:focus-visible + span {
  outline: 2px solid var(--cobalt);
  outline-offset: 3px;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.42;
}

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

.site-header {
  position: sticky;
  z-index: 30;
  top: 0;
  min-height: var(--header-height);
  display: grid;
  grid-template-columns: minmax(250px, 1fr) auto minmax(250px, 1fr);
  align-items: center;
  gap: 32px;
  padding: 14px 4vw;
  border-bottom: 1px solid var(--line);
  background: rgba(242, 242, 239, 0.96);
  backdrop-filter: blur(12px);
}

.wordmark {
  min-height: 44px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  justify-self: start;
  color: inherit;
  text-decoration: none;
}

.wordmark-main,
.wordmark-sub {
  display: block;
  text-transform: uppercase;
}

.wordmark-main {
  font-size: 0.94rem;
  font-weight: 500;
  letter-spacing: 0.19em;
}

.wordmark-sub {
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.66rem;
  letter-spacing: 0.19em;
}

.mode-switch,
.view-switch {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--line-dark);
  background: var(--paper-bright);
}

.mode-button,
.view-button {
  position: relative;
  min-height: 44px;
  border: 0;
  border-right: 1px solid var(--line);
  background: transparent;
  cursor: pointer;
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.mode-button {
  padding: 0 22px;
  text-transform: uppercase;
}

.mode-button:last-child,
.view-button:last-child {
  border-right: 0;
}

.mode-button::after,
.view-button::after {
  position: absolute;
  right: 10px;
  bottom: -1px;
  left: 10px;
  height: 2px;
  background: var(--cobalt);
  content: "";
  opacity: 0;
  transform: scaleX(0.2);
  transition:
    opacity 180ms var(--ease-out),
    transform 380ms var(--ease-out);
}

.mode-button:hover,
.view-button:hover {
  background: #e8e9e6;
}

.mode-button.is-active,
.view-button.is-active {
  color: var(--cobalt-dark);
}

.mode-button.is-active::after,
.view-button.is-active::after {
  opacity: 1;
  transform: scaleX(1);
}

.saved-choice {
  justify-self: end;
  min-height: 44px;
  padding: 0 15px;
  border: 1px solid var(--cobalt);
  border-radius: 999px;
  color: var(--cobalt-dark);
  background: transparent;
  cursor: pointer;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

main {
  min-height: calc(100vh - var(--header-height));
}

.mode-panel {
  animation: panel-reveal 640ms var(--ease-out) both;
}

.mode-panel[hidden] {
  display: none;
}

@media (min-width: 821px) {
  body[data-active-mode="inspect"] {
    overflow: hidden;
  }

  body[data-active-mode="inspect"] .site-footer {
    display: none;
  }

  .inspect-panel {
    height: calc(100dvh - var(--header-height));
    display: grid;
    grid-template-rows: minmax(0, 1fr) auto;
    overflow: hidden;
  }

  .inspect-panel .inspection-bench {
    height: 100%;
    min-height: 0;
  }

  .inspect-panel .option-ledger {
    overflow-y: auto;
    overscroll-behavior: contain;
    scrollbar-color: var(--line-dark) transparent;
    scrollbar-width: thin;
  }

  .inspect-panel .instrument-field {
    height: 100%;
  }
}

img[hidden],
.profile-render[hidden],
.profile-note[hidden] {
  display: none !important;
}

@keyframes panel-reveal {
  from {
    opacity: 0.78;
    clip-path: inset(0 0 18% 0);
    filter: blur(3px);
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    clip-path: inset(0 0 0 0);
    filter: blur(0);
    transform: translateY(0);
  }
}

@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;
  }
}

/* Inspection bench */

.inspection-bench {
  min-height: 720px;
  display: grid;
  grid-template-columns: minmax(350px, 31vw) 1fr;
  border-bottom: 1px solid var(--line);
}

.option-ledger {
  position: relative;
  z-index: 2;
  grid-column: 1;
  grid-row: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 32px clamp(24px, 3.2vw, 52px) 38px;
  border-right: 1px solid var(--line-dark);
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.34), transparent 55%),
    var(--paper);
}

.ledger-heading {
  margin-bottom: 22px;
}

.ledger-count,
.ledger-instruction,
.scale-title,
.scale-intro > p,
.section-kicker,
.instrument-option,
.instrument-name,
.rationale-kicker,
.rationale h2,
.rationale-summary,
.rationale-detail,
.tradeoff p,
.profile-note,
.measurement-note,
.site-footer p,
.current-reference span,
.guide-intro p,
.result-copy p,
.choice-dialog p {
  margin-top: 0;
}

.ledger-count {
  margin-bottom: 4px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.ledger-instruction {
  max-width: 38ch;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.ledger-columns,
.option-row {
  display: grid;
  grid-template-columns: 46px 0.58fr 0.86fr 0.92fr;
  align-items: center;
  gap: 8px;
}

.ledger-columns {
  min-height: 31px;
  border-bottom: 1px solid var(--line-dark);
  color: var(--muted);
  font-size: 0.64rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.option-list {
  margin-bottom: 25px;
}

.option-row {
  position: relative;
  width: 100%;
  min-height: 44px;
  padding: 0;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  cursor: pointer;
  text-align: left;
  transition:
    color 200ms ease,
    background-color 200ms ease;
}

.option-row::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: calc(clamp(24px, 3.2vw, 52px) * -1);
  width: 5px;
  background: var(--cobalt);
  content: "";
  transform: scaleY(0);
  transform-origin: center top;
  transition: transform 280ms var(--ease-out);
}

.option-row:hover {
  background: rgba(255, 255, 255, 0.46);
}

.option-row.is-active {
  color: var(--cobalt-dark);
}

.option-row.is-active::before {
  transform: scaleY(1);
}

.option-number {
  font-size: 1.14rem;
  font-weight: 400;
  letter-spacing: 0.08em;
}

.option-row.is-active .option-number,
.option-row.is-active .option-measure {
  font-weight: 600;
}

.option-carat,
.option-grade,
.option-measure {
  font-size: 0.78rem;
  font-variant-numeric: tabular-nums;
}

.option-grade {
  color: var(--muted);
  letter-spacing: 0.02em;
}

.option-row.is-active .option-grade {
  color: var(--cobalt-dark);
}

.rationale {
  display: flex;
  flex: 1;
  flex-direction: column;
  min-height: 360px;
}

.rationale-kicker {
  margin-bottom: 6px;
  color: var(--cobalt-dark);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.rationale h2 {
  max-width: 16ch;
  margin-bottom: 12px;
  font-size: clamp(1.35rem, 2vw, 2rem);
  font-weight: 500;
  letter-spacing: -0.025em;
  line-height: 1.08;
}

.rationale-summary {
  margin-bottom: 8px;
  font-size: 0.93rem;
  font-weight: 500;
  line-height: 1.48;
}

.rationale-detail {
  max-width: 54ch;
  margin-bottom: 17px;
  color: #42474b;
  font-size: 0.84rem;
}

.rationale-factors {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-bottom: 17px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.factor {
  min-width: 0;
  padding: 10px 8px 9px 0;
  border-right: 1px solid var(--line);
}

.factor:not(:first-child) {
  padding-left: 9px;
}

.factor:last-child {
  border-right: 0;
}

.factor span,
.tradeoff-label {
  display: block;
  margin-bottom: 3px;
  color: var(--muted);
  font-size: 0.58rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.factor strong {
  display: block;
  overflow: hidden;
  font-size: 0.76rem;
  font-weight: 600;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tradeoff {
  margin-bottom: 18px;
}

.spec-sheet {
  margin-bottom: 18px;
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
  background: rgba(255, 255, 255, 0.34);
}

.spec-sheet-heading {
  min-height: 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 9px;
  border-bottom: 1px solid var(--line);
  font-size: 0.58rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.spec-sheet-heading strong {
  color: var(--cobalt-dark);
  font-size: 0.53rem;
  font-weight: 700;
}

.spec-sheet dl {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0;
}

.spec-sheet dl > div {
  min-width: 0;
  display: grid;
  grid-template-columns: minmax(62px, 0.8fr) 1fr;
  gap: 7px;
  padding: 6px 8px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.spec-sheet dl > div:nth-child(even) {
  border-right: 0;
}

.spec-sheet dl > div:nth-last-child(-n + 2) {
  border-bottom: 0;
}

.spec-sheet dl > div.spec-wide {
  grid-column: 1 / -1;
  border-right: 0;
}

.spec-sheet dl > div.spec-wide:not(:last-child) {
  border-bottom: 1px solid var(--line);
}

.spec-sheet dt,
.spec-sheet dd {
  min-width: 0;
  margin: 0;
  font-size: 0.64rem;
  line-height: 1.25;
}

.spec-sheet dt {
  color: var(--muted);
}

.spec-sheet dd {
  overflow: hidden;
  font-weight: 600;
  text-align: right;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tradeoff p {
  margin-bottom: 0;
  color: #42474b;
  font-size: 0.8rem;
}

.primary-action,
.secondary-action {
  min-height: 50px;
  border-radius: 2px;
  cursor: pointer;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.primary-action {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  padding: 0 20px;
  border: 1px solid var(--cobalt);
  color: var(--cobalt-dark);
  background: transparent;
  transition:
    color 200ms ease,
    background-color 200ms ease,
    box-shadow 300ms var(--ease-out),
    transform 300ms var(--ease-out);
}

.primary-action:hover {
  color: #fff;
  background: var(--cobalt);
  box-shadow: 6px 9px 22px rgba(22, 69, 184, 0.2);
  transform: translateY(-2px);
}

.instrument-field {
  min-width: 0;
  grid-column: 2;
  grid-row: 1;
  padding: 18px clamp(20px, 3.6vw, 58px) 30px;
  overflow: hidden;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.75), transparent 20%),
    var(--paper-bright);
}

.instrument-toolbar {
  position: relative;
  z-index: 4;
  display: flex;
  max-width: 850px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin: 0 auto 8px;
}

.instrument-option {
  margin-bottom: 2px;
  color: var(--cobalt-dark);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.instrument-name {
  margin-bottom: 0;
  font-size: 0.86rem;
  font-weight: 500;
}

.view-button {
  min-width: 84px;
  padding: 0 13px;
}

.calibration-dial {
  --stone-scale: 0.95;
  --dial-center-x: 50.14%;
  --dial-center-y: 50.86%;
  position: relative;
  width: min(66vw, 680px, calc(100dvh - var(--header-height) - 343px));
  margin: 0 auto;
  aspect-ratio: 1;
  border: 0;
  border-radius: 50%;
  background: url("assets/instrument-dial.png") center / 100% 100% no-repeat;
  filter: drop-shadow(12px 22px 24px rgba(7, 10, 12, 0.24));
  isolation: isolate;
}

.dial-graduations {
  position: absolute;
  z-index: 1;
  inset: 0;
  border-radius: 50%;
  pointer-events: none;
}

.dial-graduations::before {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: repeating-conic-gradient(
    from -0.4deg at var(--dial-center-x) var(--dial-center-y),
    rgba(224, 229, 231, 0.48) 0 0.28deg,
    transparent 0.28deg 7.5deg
  );
  -webkit-mask: radial-gradient(
    circle at var(--dial-center-x) var(--dial-center-y),
    transparent 0 18%,
    #000 18.25% 24%,
    transparent 24.25%
  );
  mask: radial-gradient(
    circle at var(--dial-center-x) var(--dial-center-y),
    transparent 0 18%,
    #000 18.25% 24%,
    transparent 24.25%
  );
  content: "";
}

.diameter-guide {
  position: absolute;
  top: var(--dial-center-y);
  left: var(--dial-center-x);
  border: 1px solid rgba(205, 212, 215, 0.24);
  border-radius: 50%;
  aspect-ratio: 1;
  transform: translate(-50%, -50%);
}

.diameter-guide::before,
.diameter-guide::after {
  position: absolute;
  background: rgba(226, 231, 233, 0.46);
  content: "";
}

.diameter-guide::before {
  top: -4px;
  bottom: -4px;
  left: 50%;
  width: 1px;
  -webkit-mask: linear-gradient(#000 0 8px, transparent 8px calc(100% - 8px), #000 calc(100% - 8px));
  mask: linear-gradient(#000 0 8px, transparent 8px calc(100% - 8px), #000 calc(100% - 8px));
}

.diameter-guide::after {
  top: 50%;
  right: -4px;
  left: -4px;
  height: 1px;
  -webkit-mask: linear-gradient(90deg, #000 0 8px, transparent 8px calc(100% - 8px), #000 calc(100% - 8px));
  mask: linear-gradient(90deg, #000 0 8px, transparent 8px calc(100% - 8px), #000 calc(100% - 8px));
}

.guide-90 {
  width: 38%;
}

.guide-95 {
  width: 41%;
}

.guide-100 {
  width: 44%;
  border-color: rgba(226, 231, 233, 0.38);
}

.guide-105 {
  width: 47%;
}

.diameter-rail {
  position: absolute;
  top: 79%;
  left: var(--dial-center-x);
  width: 47%;
  height: 20px;
  background:
    linear-gradient(rgba(224, 229, 231, 0.36), rgba(224, 229, 231, 0.36)) center / 100% 1px no-repeat,
    repeating-linear-gradient(
      90deg,
      rgba(224, 229, 231, 0.46) 0 1px,
      transparent 1px 2.378%
    );
  -webkit-mask: linear-gradient(transparent 0 35%, #000 35% 65%, transparent 65%);
  mask: linear-gradient(transparent 0 35%, #000 35% 65%, transparent 65%);
  transform: translate(-50%, -50%);
}

.dial-graduation-label {
  position: absolute;
  top: 81%;
  left: 50%;
  color: rgba(201, 208, 211, 0.66);
  font-size: 0.48rem;
  font-weight: 600;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  transform: translateX(-50%);
  white-space: nowrap;
}

.stone-stage {
  position: absolute;
  z-index: 4;
  top: var(--dial-center-y);
  left: var(--dial-center-x);
  width: 34%;
  margin: 0;
  aspect-ratio: 1;
  transform: translate(-50%, -50%) scale(var(--stone-scale));
  transition:
    transform 520ms var(--ease-out),
    filter 420ms var(--ease-out);
}

.stone-stage.is-changing {
  filter: blur(7px);
}

.stone-stage img {
  width: 100%;
  height: 100%;
  display: block;
  border-radius: 50%;
  object-fit: cover;
  filter: contrast(1.04) saturate(0.82);
  mix-blend-mode: screen;
}

.stone-stage img.clean-specimen {
  mix-blend-mode: normal;
}

.stone-stage figcaption {
  position: absolute;
  top: calc(100% + 18px);
  left: 50%;
  width: max-content;
  max-width: 220px;
  padding: 4px 8px;
  color: var(--dial-muted);
  background: rgba(14, 17, 19, 0.8);
  font-size: 0.57rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-align: center;
  text-transform: uppercase;
  transform: translateX(-50%);
}

.profile-render {
  position: absolute;
  inset: 0;
}

.profile-render img {
  width: 100%;
  height: 100%;
  display: block;
  border-radius: 0;
  object-fit: contain;
  filter:
    contrast(1.04)
    saturate(0.9)
    drop-shadow(0 15px 12px rgba(0, 0, 0, 0.34));
  mix-blend-mode: normal;
}

.calibration-dial.is-profile .stone-stage {
  width: 70%;
  aspect-ratio: 12 / 7;
  transform: translate(-50%, -50%);
}

.calibration-dial.is-profile .dial-graduations {
  opacity: 0.28;
}

.calibration-dial.is-profile .stone-stage figcaption {
  color: var(--dial-muted);
  background: rgba(14, 17, 19, 0.8);
}

.dial-reading {
  position: absolute;
  z-index: 5;
  top: 47%;
  right: 9%;
  display: grid;
  justify-items: start;
  min-width: 96px;
  padding-left: 18px;
  color: var(--on-dark);
  background: linear-gradient(90deg, transparent, rgba(21, 25, 28, 0.88) 18%);
  transform: translateY(-50%);
}

.reading-label,
.reading-unit {
  color: var(--dial-muted);
  font-size: 0.56rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.reading-value {
  font-size: clamp(2.1rem, 3.4vw, 3.65rem);
  font-weight: 300;
  letter-spacing: -0.03em;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.dial-data {
  position: absolute;
  z-index: 5;
  display: flex;
  color: var(--dial-muted);
  font-size: 0.58rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.dial-data span + span {
  padding-left: 11px;
  border-left: 1px solid #666d71;
}

.dial-data-left {
  top: 16%;
  left: 15%;
  gap: 11px;
}

.dial-data-bottom {
  bottom: 11%;
  left: 50%;
  gap: 11px;
  transform: translateX(-50%);
}

.profile-note {
  max-width: 68ch;
  margin: 18px auto 0;
  color: var(--muted);
  font-size: 0.72rem;
  text-align: center;
}

.presence-footer {
  position: relative;
  z-index: 8;
  background: var(--paper-bright);
  box-shadow: 0 -12px 30px rgba(15, 18, 20, 0.06);
}

.diameter-dossier {
  min-height: 176px;
  display: grid;
  grid-template-columns: minmax(280px, 30vw) 1fr;
  border-bottom: 1px solid var(--line);
  background: var(--paper-bright);
}

.scale-intro {
  padding: 27px 4vw;
  border-right: 1px solid var(--line-dark);
}

.scale-title {
  margin-bottom: 3px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.17em;
  text-transform: uppercase;
}

.scale-intro > p:not(.scale-title) {
  margin-bottom: 18px;
  color: var(--muted);
  font-size: 0.78rem;
}

.current-reference {
  display: flex;
  align-items: center;
  gap: 13px;
}

.reference-stone {
  width: 39px;
  aspect-ratio: 1;
  border: 1px solid #a1a5a7;
  border-radius: 50%;
  background:
    conic-gradient(from 12deg, #eef0ef, #767d80, #fff, #9ca1a4, #eef0ef, #5d6367, #fff);
  box-shadow: 3px 6px 11px rgba(18, 21, 22, 0.17);
}

.current-reference span {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.72rem;
  line-height: 1.3;
}

.current-reference strong {
  color: var(--ink);
  font-weight: 600;
}

.scale-candidates {
  position: relative;
  display: grid;
  grid-template-columns: repeat(9, minmax(76px, 1fr));
  align-items: end;
  padding: 22px 3vw 24px;
  overflow-x: auto;
}

.scale-candidates::after {
  position: absolute;
  right: 3vw;
  bottom: 21px;
  left: 3vw;
  height: 7px;
  border-top: 1px solid var(--line-dark);
  background: repeating-linear-gradient(90deg, var(--line-dark) 0 1px, transparent 1px 20px);
  content: "";
}

.scale-option {
  position: relative;
  z-index: 1;
  display: grid;
  min-width: 76px;
  justify-items: center;
  align-content: end;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.scale-option-number {
  margin-bottom: 5px;
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.scale-thumb {
  width: var(--thumb-size);
  border-radius: 50%;
  aspect-ratio: 1;
  object-fit: cover;
  filter: grayscale(0.72) contrast(1.08);
  box-shadow: 3px 6px 10px rgba(16, 19, 21, 0.17);
  transition:
    filter 200ms ease,
    transform 330ms var(--ease-out);
}

.scale-option:hover .scale-thumb,
.scale-option.is-active .scale-thumb {
  filter: grayscale(0) contrast(1.08);
  transform: translateY(-4px);
}

.scale-option.is-active .scale-option-number {
  color: var(--cobalt-dark);
}

.scale-marker {
  width: 1px;
  height: 19px;
  margin-top: 5px;
  background: var(--line-dark);
}

.scale-option.is-active .scale-marker {
  width: 2px;
  background: var(--cobalt);
}

.measurement-note {
  margin: 0;
  padding: 9px 4vw 11px;
  color: var(--muted);
  background: #e9eae7;
  font-size: 0.66rem;
}

/* Shared editorial headings */

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(320px, 0.65fr);
  gap: 9vw;
  align-items: end;
  padding: clamp(48px, 7vw, 96px) 5vw 42px;
  border-bottom: 1px solid var(--line-dark);
}

.section-kicker {
  margin-bottom: 12px;
  color: var(--cobalt-dark);
  font-size: 0.69rem;
  font-weight: 700;
  letter-spacing: 0.17em;
  text-transform: uppercase;
}

.section-heading h1,
.guide-intro h1 {
  max-width: 16ch;
  margin: 0;
  font-size: clamp(2.35rem, 5vw, 5.5rem);
  font-weight: 400;
  letter-spacing: -0.036em;
  line-height: 0.98;
}

.section-heading > p,
.guide-intro > p:last-child {
  max-width: 58ch;
  margin: 0;
  color: #43484c;
  font-size: 0.98rem;
}

/* Comparison dossier */

.compare-panel {
  min-height: calc(100vh - var(--header-height));
}

.comparison-shell {
  width: 100%;
  overflow-x: auto;
  border-bottom: 1px solid var(--line-dark);
  background:
    linear-gradient(90deg, rgba(0, 0, 0, 0.035), transparent 4%, transparent 94%, rgba(22, 69, 184, 0.08)),
    var(--paper-bright);
}

.comparison-table {
  width: 100%;
  min-width: 1240px;
  border-collapse: collapse;
  table-layout: fixed;
  font-variant-numeric: tabular-nums;
}

.comparison-table th,
.comparison-table td {
  min-width: 112px;
  padding: 13px 12px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  text-align: center;
}

.comparison-table th:first-child,
.comparison-table td:first-child {
  position: sticky;
  z-index: 3;
  left: 0;
  width: 185px;
  min-width: 185px;
  padding-left: 5vw;
  color: var(--muted);
  background: var(--paper);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.11em;
  text-align: left;
  text-transform: uppercase;
}

.comparison-table thead th {
  padding-top: 20px;
  padding-bottom: 18px;
  color: var(--ink);
  background: #e8e9e6;
  vertical-align: bottom;
}

.comparison-table thead th:first-child {
  z-index: 4;
}

.comparison-table .compare-candidate {
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.compare-image {
  width: 62px;
  margin-bottom: 8px;
  border-radius: 50%;
  aspect-ratio: 1;
  object-fit: cover;
  filter: grayscale(0.4) contrast(1.06);
  box-shadow: 3px 6px 12px rgba(15, 18, 20, 0.15);
}

.compare-number {
  display: block;
  margin-bottom: 2px;
  font-size: 1.16rem;
  font-weight: 500;
  letter-spacing: 0.08em;
}

.compare-title {
  display: block;
  min-height: 30px;
  color: var(--muted);
  font-size: 0.64rem;
  font-weight: 500;
  line-height: 1.25;
}

.comparison-table td {
  color: #303438;
  background: rgba(255, 255, 255, 0.43);
  font-size: 0.79rem;
}

.comparison-table td.is-active,
.comparison-table th.is-active {
  color: var(--cobalt-dark);
  background: rgba(22, 69, 184, 0.075);
  box-shadow: inset 2px 0 var(--cobalt), inset -1px 0 var(--cobalt);
}

.comparison-table tr:last-child td,
.comparison-table tr:last-child th {
  border-bottom: 0;
}

.table-action {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  border: 0;
  border-bottom: 1px solid currentColor;
  color: var(--cobalt-dark);
  background: transparent;
  cursor: pointer;
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.comparison-legend {
  display: flex;
  align-items: center;
  gap: 34px;
  padding: 22px 5vw 60px;
}

.comparison-legend p {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0;
  color: var(--muted);
  font-size: 0.67rem;
}

.legend-line {
  display: inline-block;
  width: 26px;
  height: 2px;
}

.legend-line.cobalt {
  background: var(--cobalt);
}

.legend-line.graphite {
  background: var(--ink);
}

.text-action {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  padding: 0;
  border: 0;
  border-bottom: 1px solid currentColor;
  color: var(--cobalt-dark);
  background: transparent;
  cursor: pointer;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.07em;
}

.comparison-legend .text-action {
  margin-left: auto;
}

/* Decision guide */

.guide-panel {
  min-height: calc(100vh - var(--header-height));
}

.guide-intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 0.52fr);
  column-gap: 10vw;
  align-items: end;
  padding: clamp(48px, 7vw, 92px) 7vw 52px;
  border-bottom: 1px solid var(--line-dark);
}

.guide-intro .section-kicker {
  grid-column: 1 / -1;
}

.decision-tree {
  position: relative;
  padding: 8px 7vw 0;
}

.decision-tree::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: calc(7vw + 19px);
  width: 1px;
  background: var(--cobalt);
  content: "";
}

.decision-branch {
  position: relative;
  display: grid;
  grid-template-columns: minmax(260px, 0.7fr) 1.4fr;
  gap: 5vw;
  align-items: center;
  margin: 0;
  padding: 38px 0 38px 58px;
  border: 0;
  border-bottom: 1px solid var(--line);
}

.branch-number {
  position: absolute;
  top: 50%;
  left: 9px;
  display: grid;
  width: 19px;
  height: 19px;
  place-items: center;
  border: 1px solid var(--cobalt);
  border-radius: 50%;
  color: var(--cobalt-dark);
  background: var(--paper);
  font-size: 0.51rem;
  font-weight: 700;
  transform: translateY(-50%);
}

.branch-question {
  max-width: 30ch;
  font-size: clamp(1.15rem, 2vw, 1.6rem);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.branch-options {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: 1px solid var(--line-dark);
}

.presence-options {
  grid-template-columns: repeat(4, 1fr);
}

.branch-options label {
  position: relative;
  min-width: 0;
  border-right: 1px solid var(--line);
  cursor: pointer;
}

.branch-options label:last-child {
  border-right: 0;
}

.branch-options input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.branch-options span {
  min-height: 96px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 15px 16px;
  background: var(--paper-bright);
  transition:
    color 180ms ease,
    background-color 180ms ease;
}

.branch-options strong {
  margin-bottom: 5px;
  font-size: 0.78rem;
  font-weight: 600;
}

.branch-options small {
  color: var(--muted);
  font-size: 0.67rem;
  line-height: 1.3;
}

.branch-options label:hover span {
  background: #e8e9e6;
}

.branch-options input:checked + span {
  color: #fff;
  background: var(--cobalt);
}

.branch-options input:checked + span small {
  color: #e1e8ff;
}

.guide-result {
  display: grid;
  grid-template-columns: minmax(150px, 0.28fr) 1fr minmax(220px, 0.35fr);
  gap: 4vw;
  align-items: center;
  padding: 48px 7vw 64px;
  color: var(--on-dark);
  background: var(--dial);
}

.result-lead {
  padding-right: 3vw;
  border-right: 1px solid #50575b;
}

.result-kicker {
  margin-bottom: 8px;
  color: var(--dial-muted);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.result-number {
  margin-bottom: 0;
  font-size: clamp(4rem, 8vw, 8rem);
  font-weight: 300;
  letter-spacing: -0.04em;
  line-height: 0.84;
}

.result-copy h2 {
  margin: 0 0 10px;
  font-size: clamp(1.6rem, 3vw, 3rem);
  font-weight: 400;
  letter-spacing: -0.03em;
}

.result-copy > p {
  max-width: 62ch;
  margin-bottom: 14px;
  color: #d3d7d8;
  font-size: 0.85rem;
}

.result-runner-up {
  color: var(--dial-muted);
  font-size: 0.68rem;
}

.guide-result .primary-action {
  color: #fff;
  border-color: #5f83dd;
}

.guide-result .primary-action:hover {
  border-color: var(--cobalt);
}

/* Introduction */

.intro-screen {
  position: fixed;
  z-index: 120;
  inset: 0;
  width: 100vw;
  max-width: none;
  height: 100dvh;
  max-height: none;
  margin: 0;
  padding: 0;
  border: 0;
  color: var(--ink);
  background: var(--paper);
  overflow: auto;
}

.intro-screen::backdrop {
  background: var(--paper);
}

.intro-shell {
  min-height: 100%;
  display: grid;
  grid-template-rows: 82px minmax(0, 1fr);
  animation: intro-reveal 700ms var(--ease-out) both;
}

.intro-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 5vw;
  border-bottom: 1px solid var(--line-dark);
  font-size: 0.67rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.intro-header span:last-child {
  color: var(--muted);
}

.intro-layout {
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(380px, 0.78fr) minmax(620px, 1.22fr);
  grid-template-rows: minmax(0, 1fr);
}

.intro-narrative {
  grid-column: 1;
  grid-row: 1;
  display: flex;
  flex-direction: column;
  gap: clamp(32px, 5vh, 64px);
  padding:
    clamp(46px, 6vw, 92px)
    clamp(36px, 5vw, 78px)
    calc(clamp(36px, 5vw, 72px) + 72px);
  border-right: 1px solid var(--line-dark);
  background:
    linear-gradient(118deg, rgba(255, 255, 255, 0.62), transparent 45%),
    var(--paper);
}

.intro-kicker {
  margin: 0 0 18px;
  color: var(--cobalt-dark);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.intro-narrative h1 {
  max-width: 10.5ch;
  margin: 0 0 28px;
  font-size: clamp(2.8rem, 5.4vw, 5.8rem);
  font-weight: 300;
  letter-spacing: -0.038em;
  line-height: 0.96;
  text-wrap: balance;
}

.intro-summary {
  max-width: 58ch;
  margin: 0;
  color: #3f4447;
  font-size: clamp(0.96rem, 1.1vw, 1.12rem);
}

.intro-caveat {
  max-width: 62ch;
  padding: 19px 0 0;
  border-top: 1px solid var(--line-dark);
}

.intro-caveat span {
  display: block;
  margin-bottom: 7px;
  color: var(--cobalt-dark);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.intro-caveat p {
  margin: 0;
  color: var(--muted);
  font-size: 0.83rem;
}

.intro-form {
  z-index: 2;
  grid-column: 1;
  grid-row: 1;
  align-self: end;
  width: min(220px, calc(100% - 72px));
  margin:
    0
    clamp(36px, 5vw, 78px)
    clamp(36px, 5vw, 72px);
}

.intro-action {
  max-width: 220px;
  justify-content: center;
  margin: 0;
}

.intro-standard {
  grid-column: 2;
  grid-row: 1;
  min-width: 0;
  padding: clamp(34px, 4.5vw, 72px) clamp(34px, 5vw, 84px);
  color: var(--on-dark);
  background:
    radial-gradient(circle at 76% 16%, #2c3236 0%, transparent 35%),
    var(--dial);
}

.standard-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid #596064;
}

.standard-heading p {
  margin: 0;
  color: var(--dial-muted);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.17em;
  text-transform: uppercase;
}

.standard-heading strong {
  font-size: 0.82rem;
  font-weight: 500;
}

.standard-row {
  display: grid;
  grid-template-columns: minmax(112px, 0.2fr) minmax(320px, 0.56fr) minmax(220px, 0.42fr);
  gap: clamp(20px, 3vw, 48px);
  align-items: center;
  padding: clamp(24px, 3.2vh, 38px) 0;
  border-bottom: 1px solid #41484c;
}

.standard-row-final {
  border-bottom-color: #596064;
}

.standard-name span {
  display: block;
  margin-bottom: 4px;
  color: var(--dial-muted);
  font-size: 0.59rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.standard-name strong {
  font-size: clamp(1.1rem, 1.7vw, 1.65rem);
  font-weight: 400;
  letter-spacing: -0.025em;
}

.standard-row > p {
  max-width: 38ch;
  margin: 0;
  color: #c8ced1;
  font-size: 0.74rem;
}

.grade-scale {
  position: relative;
  display: grid;
  align-items: stretch;
  border-top: 1px solid #747c80;
  border-bottom: 1px solid #747c80;
}

.color-scale,
.clarity-scale {
  grid-template-columns: repeat(7, minmax(42px, 1fr));
}

.craft-scale {
  grid-template-columns: 1.25fr 1.1fr repeat(3, 0.8fr);
}

.grade-scale span {
  min-height: 34px;
  display: grid;
  place-items: center;
  border-right: 1px solid #555d61;
  color: #aeb5b8;
  font-size: 0.57rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-align: center;
  text-transform: uppercase;
}

.grade-scale span:last-child {
  border-right: 0;
}

.grade-scale .is-selected {
  color: #fff;
  background: var(--cobalt);
  box-shadow: inset 0 -2px #9db4ee;
}

.grade-scale .is-exception {
  background: #334b86;
}

.presence-range {
  position: relative;
  display: flex;
  justify-content: space-between;
  padding-top: 21px;
  color: #d6dbdd;
  font-size: 0.64rem;
  font-variant-numeric: tabular-nums;
}

.presence-range::before {
  position: absolute;
  top: 8px;
  right: 0;
  left: 0;
  height: 8px;
  border-top: 1px solid #8d969a;
  border-right: 1px solid #8d969a;
  border-left: 1px solid #8d969a;
  background: repeating-linear-gradient(90deg, #697175 0 1px, transparent 1px 8%);
  content: "";
}

@keyframes intro-reveal {
  from {
    opacity: 0.9;
    clip-path: inset(0 0 12% 0);
    filter: blur(2px);
  }
  to {
    opacity: 1;
    clip-path: inset(0);
    filter: blur(0);
  }
}

@media (max-width: 1100px) {
  .intro-layout {
    grid-template-columns: minmax(330px, 0.7fr) minmax(540px, 1.3fr);
  }

  .standard-row {
    grid-template-columns: 100px 1fr;
  }

  .standard-row > p {
    grid-column: 2;
  }
}

@media (max-width: 820px) {
  .intro-shell {
    grid-template-rows: 70px auto;
  }

  .intro-layout {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto;
  }

  .intro-narrative {
    grid-column: 1;
    grid-row: 1;
    padding: 48px 24px 30px;
    border-right: 0;
  }

  .intro-narrative h1 {
    max-width: 12ch;
    font-size: clamp(2.8rem, 12vw, 4.6rem);
  }

  .intro-standard {
    grid-column: 1;
    grid-row: 2;
    padding: 42px 24px 56px;
  }

  .standard-row {
    grid-template-columns: minmax(92px, 0.22fr) 1fr;
  }

  .intro-form {
    grid-column: 1;
    grid-row: 3;
    width: auto;
    margin: 0;
    padding:
      0
      max(24px, env(safe-area-inset-right))
      max(32px, calc(env(safe-area-inset-bottom) + 18px))
      max(24px, env(safe-area-inset-left));
    background: var(--dial);
  }

  .intro-action {
    width: 100%;
    max-width: none;
    min-height: 56px;
    color: #fff;
    border-color: #5f83dd;
  }
}

@media (max-width: 540px) {
  .intro-shell {
    grid-template-rows: calc(58px + env(safe-area-inset-top)) auto;
  }

  .intro-header {
    padding:
      env(safe-area-inset-top)
      max(20px, env(safe-area-inset-right))
      0
      max(20px, env(safe-area-inset-left));
    font-size: 0.62rem;
  }

  .intro-header span:last-child {
    display: none;
  }

  .intro-narrative {
    gap: 20px;
    padding:
      26px
      max(20px, env(safe-area-inset-right))
      24px
      max(20px, env(safe-area-inset-left));
  }

  .intro-kicker {
    margin-bottom: 10px;
  }

  .intro-narrative h1 {
    max-width: none;
    margin-bottom: 14px;
    font-size: clamp(2.05rem, 9.4vw, 2.35rem);
    line-height: 1;
  }

  .intro-summary {
    font-size: 0.92rem;
    line-height: 1.48;
  }

  .intro-caveat {
    padding-top: 14px;
  }

  .intro-caveat p {
    font-size: 0.8rem;
    line-height: 1.45;
  }

  .intro-standard {
    padding:
      28px
      max(20px, env(safe-area-inset-right))
      34px
      max(20px, env(safe-area-inset-left));
  }

  .standard-heading {
    align-items: flex-start;
    flex-direction: column;
    gap: 6px;
  }

  .standard-row {
    grid-template-columns: 1fr;
    gap: 15px;
    padding: 24px 0;
  }

  .standard-row > p {
    grid-column: 1;
  }

  .color-scale,
  .clarity-scale {
    grid-template-columns: repeat(7, minmax(0, 1fr));
  }

  .grade-scale span {
    min-height: 42px;
    font-size: 0.65rem;
    line-height: 1.1;
  }

  .standard-row > p {
    font-size: 0.8rem;
    line-height: 1.45;
  }
}

/* Choice state */

.choice-dialog {
  width: min(560px, calc(100vw - 36px));
  padding: 0;
  border: 1px solid #a7abad;
  border-radius: 2px;
  color: var(--ink);
  background: var(--paper-bright);
  box-shadow: 18px 28px 80px rgba(6, 8, 10, 0.38);
}

.choice-dialog::backdrop {
  background: rgba(12, 15, 17, 0.78);
  backdrop-filter: blur(6px);
}

.choice-dialog-inner {
  padding: clamp(30px, 6vw, 62px);
}

.choice-dialog-kicker {
  margin-bottom: 12px;
  color: var(--cobalt-dark);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.17em;
  text-transform: uppercase;
}

.choice-dialog-number {
  margin-bottom: 14px;
  font-size: clamp(4.4rem, 12vw, 7.4rem);
  font-weight: 300;
  letter-spacing: -0.04em;
  line-height: 0.86;
}

.choice-dialog h2 {
  margin: 0 0 12px;
  font-size: clamp(1.6rem, 4vw, 2.5rem);
  font-weight: 400;
  letter-spacing: -0.03em;
}

.choice-dialog-inner > p:not(.choice-dialog-kicker, .choice-dialog-number) {
  max-width: 46ch;
  color: var(--muted);
}

.choice-dialog-actions {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 10px;
  margin-top: 30px;
}

.secondary-action {
  padding: 0 18px;
  border: 1px solid var(--line-dark);
  background: transparent;
}

.secondary-action:hover {
  background: #e7e8e5;
}

.choice-dialog .primary-action {
  margin: 0;
}

.choice-confirmation {
  position: fixed;
  z-index: 100;
  inset: 0;
  display: grid;
  place-content: center;
  justify-items: center;
  color: var(--on-dark);
  background:
    radial-gradient(circle at center, #242a2e 0%, var(--dial) 52%, #090b0d 100%);
  animation: confirmation-reveal 720ms var(--ease-out) both;
  overflow: hidden;
}

.choice-confirmation[hidden] {
  display: none;
}

.choice-confirmation p {
  margin: 0 0 12px;
  color: var(--dial-muted);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.choice-confirmation strong {
  font-size: clamp(8rem, 26vw, 20rem);
  font-weight: 200;
  letter-spacing: -0.055em;
  line-height: 0.8;
}

.choice-confirmation span {
  margin-top: 28px;
  font-size: 0.9rem;
}

.heart-burst {
  position: absolute;
  z-index: 1;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.choice-confirmation > p,
.choice-confirmation > strong,
.choice-confirmation > span,
.choice-confirmation > button {
  position: relative;
  z-index: 2;
}

.heart-particle {
  position: absolute;
  top: 50%;
  left: 50%;
  display: block;
  font-size: var(--heart-size);
  line-height: 1;
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.2);
  animation: heart-explode 1900ms var(--ease-out) var(--heart-delay) both;
  will-change: transform, opacity, filter;
}

@keyframes heart-explode {
  0% {
    opacity: 0;
    filter: blur(7px);
    transform: translate(-50%, -50%) scale(0.15) rotate(0deg);
  }
  12% {
    opacity: 1;
    filter: blur(0);
  }
  76% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    filter: blur(1px);
    transform:
      translate(
        calc(-50% + var(--heart-x)),
        calc(-50% + var(--heart-y))
      )
      scale(1.15)
      rotate(var(--heart-spin));
  }
}

.confirmation-close {
  position: absolute;
  top: 28px;
  right: 32px;
  width: 44px;
  height: 44px;
  border: 1px solid #5c6468;
  border-radius: 50%;
  color: #fff;
  background: transparent;
  cursor: pointer;
  font-size: 1.5rem;
}

@keyframes confirmation-reveal {
  from {
    opacity: 0;
    clip-path: circle(0 at 50% 50%);
    filter: blur(8px);
  }
  to {
    opacity: 1;
    clip-path: circle(76% at 50% 50%);
    filter: blur(0);
  }
}

.site-footer {
  min-height: 88px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 22px 4vw;
  color: var(--muted);
  background: #e6e7e4;
  font-size: 0.72rem;
}

.site-footer p {
  margin-bottom: 0;
}

.noscript-message {
  position: fixed;
  z-index: 200;
  right: 20px;
  bottom: 20px;
  left: 20px;
  padding: 18px;
  border: 1px solid #9b2929;
  color: #531010;
  background: #fff4f4;
}

/* Responsive composition */

@media (max-width: 1120px) {
  .site-header {
    grid-template-columns: minmax(200px, 1fr) auto;
  }

  .saved-choice {
    display: none;
  }

  .inspection-bench {
    grid-template-columns: minmax(320px, 36vw) 1fr;
  }

  .option-ledger {
    padding-right: 28px;
    padding-left: 28px;
  }

  .option-row::before {
    left: -28px;
  }

  .calibration-dial {
    width: min(59vw, 620px, calc(100dvh - var(--header-height) - 343px));
  }

  .dial-reading {
    right: 7%;
  }

  .rationale {
    min-height: 395px;
  }

  .comparison-table th:first-child,
  .comparison-table td:first-child {
    padding-left: 32px;
  }

  .decision-branch {
    grid-template-columns: 0.55fr 1.45fr;
    gap: 3vw;
  }
}

@media (max-width: 820px) {
  :root {
    --header-height: calc(122px + env(safe-area-inset-top));
  }

  .site-header {
    grid-template-columns: 1fr;
    gap: 13px;
    padding:
      max(15px, env(safe-area-inset-top))
      max(18px, env(safe-area-inset-right))
      13px
      max(18px, env(safe-area-inset-left));
  }

  .wordmark {
    justify-self: center;
    text-align: center;
  }

  .mode-switch {
    width: 100%;
  }

  .mode-button {
    flex: 1;
    padding: 0 10px;
  }

  .inspection-bench {
    display: flex;
    flex-direction: column;
  }

  .instrument-field {
    padding: 18px 20px 42px;
    border-bottom: 1px solid var(--line-dark);
  }

  .instrument-toolbar {
    max-width: 640px;
  }

  .calibration-dial {
    width: min(83vw, 620px);
  }

  .option-ledger {
    padding: 31px 24px 35px;
    border-right: 0;
  }

  .option-row::before {
    left: -24px;
  }

  .option-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    margin-bottom: 30px;
    background: var(--line);
    border: 1px solid var(--line);
  }

  .ledger-columns {
    display: none;
  }

  .option-row {
    display: grid;
    grid-template-columns: 1fr;
    min-height: 90px;
    justify-items: center;
    align-content: center;
    border: 0;
    background: var(--paper-bright);
    text-align: center;
  }

  .option-row::before {
    top: auto;
    right: 0;
    bottom: 0;
    left: 0;
    width: auto;
    height: 3px;
    transform: scaleX(0);
    transform-origin: left center;
    transition: transform 280ms var(--ease-out);
  }

  .option-row.is-active::before {
    width: auto;
    height: 3px;
    transform: scaleX(1);
  }

  .option-carat,
  .option-grade,
  .option-measure {
    font-size: 0.66rem;
  }

  .rationale {
    min-height: 0;
  }

  .rationale h2 {
    max-width: 22ch;
  }

  .primary-action {
    margin-top: 8px;
  }

  .diameter-dossier {
    grid-template-columns: 1fr;
  }

  .scale-intro {
    display: grid;
    grid-template-columns: 1fr auto;
    column-gap: 20px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .scale-intro > p {
    grid-column: 1;
  }

  .current-reference {
    grid-column: 2;
    grid-row: 1 / span 2;
  }

  .scale-candidates {
    min-height: 146px;
  }

  .section-heading,
  .guide-intro {
    grid-template-columns: 1fr;
    gap: 28px;
    align-items: start;
    padding: 52px 24px 38px;
  }

  .guide-intro .section-kicker {
    grid-column: 1;
  }

  .section-heading h1,
  .guide-intro h1 {
    max-width: 14ch;
  }

  .comparison-legend {
    flex-wrap: wrap;
    gap: 14px 24px;
    padding: 18px 24px 48px;
  }

  .comparison-legend .text-action {
    width: max-content;
    margin: 8px 0 0;
  }

  .decision-tree {
    padding-right: 24px;
    padding-left: 24px;
  }

  .decision-tree::before {
    left: 42px;
  }

  .decision-branch {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 31px 0 31px 52px;
  }

  .guide-result {
    grid-template-columns: 130px 1fr;
    gap: 28px;
    padding: 40px 24px 50px;
  }

  .result-action {
    grid-column: 1 / -1;
  }
}

@media (max-width: 540px) {
  .wordmark-main {
    font-size: 0.76rem;
    letter-spacing: 0.13em;
  }

  .wordmark-sub {
    font-size: 0.55rem;
  }

  .mode-button {
    min-height: 44px;
    font-size: 0.64rem;
  }

  .instrument-toolbar {
    align-items: flex-start;
  }

  .instrument-name {
    max-width: 20ch;
    font-size: 0.75rem;
  }

  .view-button {
    min-width: auto;
    min-height: 44px;
    padding: 0 9px;
    font-size: 0.66rem;
  }

  .calibration-dial {
    width: min(78vw, 450px);
  }

  .dial-reading {
    right: 2%;
    min-width: 76px;
    padding-left: 9px;
  }

  .reading-value {
    font-size: 2rem;
  }

  .dial-data-left {
    top: 12%;
    left: 12%;
  }

  .dial-data-bottom {
    bottom: 8%;
    width: 75%;
    justify-content: center;
    font-size: 0.58rem;
  }

  .stone-stage {
    width: 34%;
  }

  .diameter-guide {
    border-color: rgba(205, 212, 215, 0.38);
  }

  .guide-100 {
    border-color: rgba(226, 231, 233, 0.56);
  }

  .stone-stage figcaption {
    top: calc(100% + 12px);
    font-size: 0.48rem;
  }

  .option-list {
    grid-template-columns: repeat(3, 1fr);
  }

  .option-row {
    min-height: 72px;
  }

  .rationale-factors {
    grid-template-columns: 1fr;
  }

  .factor,
  .factor:not(:first-child) {
    padding: 8px 0;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .factor:last-child {
    border-bottom: 0;
  }

  .scale-intro {
    grid-template-columns: 1fr;
  }

  .current-reference {
    grid-column: 1;
    grid-row: auto;
  }

  .scale-candidates {
    padding-right: 16px;
    padding-left: 16px;
  }

  .section-heading h1,
  .guide-intro h1 {
    font-size: 2.6rem;
  }

  .branch-options {
    grid-template-columns: 1fr;
  }

  .branch-options label {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .branch-options label:last-child {
    border-bottom: 0;
  }

  .branch-options span {
    min-height: 72px;
  }

  .guide-result {
    grid-template-columns: 1fr;
  }

  .result-lead {
    display: flex;
    align-items: baseline;
    gap: 16px;
    padding: 0 0 22px;
    border-right: 0;
    border-bottom: 1px solid #50575b;
  }

  .result-number {
    font-size: 5.6rem;
  }

  .choice-dialog-actions {
    grid-template-columns: 1fr;
  }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }
}