:root {
  --bg: #070707;
  --bg-soft: #0c0c0b;
  --panel: #11110f;
  --panel-2: #151512;
  --ink: #f2eee7;
  --muted: #aaa197;
  --muted-2: #766f68;
  --line: rgba(231, 197, 126, 0.18);
  --line-strong: rgba(231, 197, 126, 0.46);
  --gold: #d9ae5f;
  --gold-light: #f1d193;
  --shell: min(1440px, calc(100vw - 7rem));
  --serif: "Noto Serif TC", "Songti TC", "PMingLiU", serif;
  --sans: "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  --latin: Inter, "Helvetica Neue", Arial, sans-serif;
  --header-h: 74px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--bg);
  color-scheme: dark;
}

body {
  margin: 0;
  min-width: 320px;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 12% 8%, rgba(190, 145, 74, 0.075), transparent 28rem),
    var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::selection {
  background: var(--gold);
  color: #080706;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input {
  font: inherit;
}

button {
  color: inherit;
}

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

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 1rem;
  left: 1rem;
  padding: .65rem .9rem;
  border: 1px solid var(--gold);
  background: #111;
  color: #fff;
  transform: translateY(-180%);
  transition: transform .2s ease;
}

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

.site-header {
  position: fixed;
  z-index: 100;
  inset: 0 0 auto;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  height: var(--header-h);
  padding: 0 clamp(1.25rem, 3.2vw, 4rem);
  border-bottom: 1px solid rgba(255, 255, 255, .08);
  background: rgba(7, 7, 7, .84);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.brand {
  display: inline-flex;
  align-items: center;
  justify-self: start;
  gap: .7rem;
  width: max-content;
  font-family: var(--latin);
  letter-spacing: .11em;
  white-space: nowrap;
}

.brand-light {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gold-light);
  box-shadow: 0 0 14px rgba(241, 209, 147, .9);
}

.brand strong {
  font-size: .83rem;
  letter-spacing: .16em;
}

.brand strong span {
  color: var(--gold-light);
}

.brand small {
  padding-left: .65rem;
  border-left: 1px solid rgba(255, 255, 255, .13);
  color: var(--muted-2);
  font-size: .68rem;
  letter-spacing: .24em;
}

.chapter-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(1rem, 2.2vw, 2.5rem);
}

.chapter-nav a {
  position: relative;
  padding: .35rem 0;
  color: #8d8983;
  font-size: .69rem;
  letter-spacing: .2em;
  transition: color .25s ease;
}

.chapter-nav a::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 1px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform .3s ease;
}

.chapter-nav a:hover,
.chapter-nav a:focus-visible {
  color: var(--ink);
}

.chapter-nav a:hover::after,
.chapter-nav a:focus-visible::after {
  transform: scaleX(1);
  transform-origin: left;
}

.page-mark {
  justify-self: end;
  color: #69645e;
  font-family: var(--latin);
  font-size: .58rem;
  letter-spacing: .28em;
}

.reading-progress {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 2px;
  overflow: hidden;
}

.reading-progress span {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, #9b743d, var(--gold-light));
  box-shadow: 0 0 12px rgba(217, 174, 95, .5);
  transform: scaleX(0);
  transform-origin: left center;
  will-change: transform;
}

.section-shell {
  width: var(--shell);
  margin-inline: auto;
}

.eyebrow,
.comparison-kicker,
.proof-frame figcaption > span,
.service-sequence div > span,
.thermal-sequence div > span,
.backplate-copy > span,
.complete-card figcaption > span,
.validation-note > span {
  color: var(--gold);
  font-family: var(--latin);
  font-size: .66rem;
  font-weight: 700;
  letter-spacing: .28em;
  line-height: 1.5;
  text-transform: uppercase;
}

.comparison-kicker,
.proof-frame figcaption > span,
.service-sequence div > span,
.thermal-sequence div > span,
.backplate-copy > span,
.complete-card figcaption > span,
.validation-note > span {
  display: block;
  width: max-content;
  max-width: 100%;
  white-space: nowrap;
}

.headline-line {
  display: block;
  width: max-content;
  white-space: nowrap;
}

h1,
h2,
h3 {
  text-wrap: balance;
}

@supports (word-break: auto-phrase) {
  h1,
  h2,
  h3 {
    word-break: auto-phrase;
  }
}

.hero {
  position: relative;
  display: grid;
  align-items: end;
  min-height: max(760px, 100svh);
  overflow: hidden;
  isolation: isolate;
  background: #090909;
}

.hero-media,
.hero-media img,
.hero-shade {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-media {
  z-index: -3;
}

.hero-media img {
  object-fit: cover;
  object-position: 56% 52%;
  filter: saturate(.78) contrast(1.04) brightness(.79);
  transform: scale(1.015);
}

.hero-shade {
  z-index: -2;
  background:
    linear-gradient(90deg, rgba(5, 5, 5, .95) 0%, rgba(5, 5, 5, .7) 38%, rgba(5, 5, 5, .18) 73%),
    linear-gradient(0deg, rgba(5, 5, 5, .93) 0%, transparent 48%, rgba(5, 5, 5, .43) 100%);
}

.hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  right: 6vw;
  bottom: -1px;
  left: 6vw;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-strong), transparent);
}

.hero-copy {
  width: min(1120px, calc(100vw - 5rem));
  margin: 0 0 clamp(4.5rem, 9vh, 8rem) clamp(2rem, 8vw, 10rem);
}

.hero h1 {
  margin-top: 1.25rem;
  font-family: var(--serif);
  font-size: clamp(3.25rem, 6vw, 7.6rem);
  font-weight: 500;
  letter-spacing: -.04em;
  line-height: 1.22;
  text-wrap: balance;
}

.hero-lead {
  width: min(650px, 100%);
  margin-top: 2rem;
  color: #b9b1a8;
  font-size: clamp(.92rem, 1.15vw, 1.08rem);
  line-height: 2;
}

.scroll-cue {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  margin-top: 2.4rem;
  color: var(--gold-light);
  font-size: .72rem;
  letter-spacing: .18em;
}

.scroll-cue i {
  position: relative;
  width: 42px;
  height: 1px;
  background: currentColor;
}

.scroll-cue i::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 8px;
  height: 8px;
  border-right: 1px solid currentColor;
  border-bottom: 1px solid currentColor;
  transform: rotate(45deg) translate(2px, 3px);
}

.hero-spec {
  position: absolute;
  right: clamp(1.5rem, 5vw, 6rem);
  bottom: clamp(3.2rem, 8vh, 7rem);
  display: grid;
  min-width: 178px;
  padding: 1.2rem 0 1rem 1.25rem;
  border-left: 1px solid var(--gold);
  background: linear-gradient(90deg, rgba(7, 7, 7, .65), transparent);
  font-family: var(--latin);
}

.hero-spec span {
  color: var(--muted-2);
  font-size: .54rem;
  letter-spacing: .28em;
}

.hero-spec strong {
  margin-top: .42rem;
  font-size: .95rem;
  letter-spacing: .09em;
}

.hero-spec b {
  color: var(--gold);
  font-size: .7rem;
  letter-spacing: .21em;
}

.section-number {
  padding-top: .5rem;
  color: var(--gold);
  font-family: var(--latin);
  font-size: .62rem;
  font-weight: 700;
  letter-spacing: .28em;
}

.intro {
  display: grid;
  grid-template-columns: .14fr .86fr;
  padding-block: clamp(7rem, 12vw, 13rem);
}

.intro-copy {
  max-width: 1080px;
}

.intro h2,
.story-heading h2,
.finale h2 {
  margin-top: 1rem;
  font-family: var(--serif);
  font-size: clamp(2.7rem, 5.25vw, 6rem);
  font-weight: 500;
  letter-spacing: -.035em;
  line-height: 1.28;
}

.intro-copy > p:last-child {
  width: min(660px, 100%);
  margin-top: 2rem;
  color: var(--muted);
  font-size: .95rem;
  line-height: 2;
}

.intro .comparison-wrap,
.intro .proof-frame {
  grid-column: 1 / -1;
}

.comparison-wrap {
  display: grid;
  grid-template-columns: minmax(280px, .34fr) minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 6rem);
  align-items: end;
  width: min(1680px, calc(100vw - 4rem));
  margin: clamp(6rem, 10vw, 10rem) auto 0;
  padding-inline: clamp(0rem, 2vw, 2rem);
}

.comparison-wrap-reverse {
  grid-template-columns: minmax(0, 1fr) minmax(280px, .34fr);
}

.comparison-wrap-reverse .comparison-copy {
  order: 2;
}

.comparison-wrap-reverse .comparison {
  order: 1;
}

.comparison-copy {
  padding-bottom: 1rem;
}

.comparison-copy h3 {
  margin-top: .9rem;
  font-family: var(--serif);
  font-size: clamp(1.8rem, 2.3vw, 2.7rem);
  font-weight: 500;
  letter-spacing: -.02em;
  line-height: 1.38;
}

.comparison-copy p {
  margin-top: 1.25rem;
  color: var(--muted);
  font-size: .88rem;
  line-height: 1.9;
}

.comparison {
  --position: 50%;
  position: relative;
  aspect-ratio: 4 / 3;
  min-width: 0;
  overflow: hidden;
  background: #111;
  box-shadow: 0 32px 90px rgba(0, 0, 0, .3);
}

.comparison img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.comparison-after {
  position: absolute;
  inset: 0;
}

.comparison-before {
  position: absolute;
  z-index: 2;
  inset: 0;
  width: 100%;
  overflow: hidden;
  clip-path: inset(0 calc(100% - var(--position)) 0 0);
}

.comparison-before img {
  width: 100%;
  max-width: none;
}

.comparison input {
  position: absolute;
  z-index: 6;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  cursor: ew-resize;
  opacity: 0;
}

.comparison-handle {
  position: absolute;
  z-index: 5;
  top: 0;
  bottom: 0;
  left: var(--position);
  width: 1px;
  background: rgba(255, 255, 255, .9);
  pointer-events: none;
}

.comparison-handle i {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 56px;
  height: 56px;
  border: 1px solid rgba(255, 255, 255, .85);
  border-radius: 50%;
  background: rgba(8, 8, 8, .72);
  box-shadow: 0 0 0 5px rgba(0, 0, 0, .16);
  transform: translate(-50%, -50%);
  backdrop-filter: blur(10px);
}

.comparison-handle i::before,
.comparison-handle i::after {
  content: "";
  position: absolute;
  top: 50%;
  width: 9px;
  height: 9px;
  border-top: 1px solid var(--gold-light);
  border-right: 1px solid var(--gold-light);
}

.comparison-handle i::before {
  left: 14px;
  transform: translateY(-50%) rotate(-135deg);
}

.comparison-handle i::after {
  right: 14px;
  transform: translateY(-50%) rotate(45deg);
}

.compare-label {
  position: absolute;
  z-index: 4;
  bottom: 1rem;
  padding: .38rem .55rem;
  background: rgba(5, 5, 5, .76);
  color: var(--gold-light);
  font-family: var(--latin);
  font-size: .56rem;
  letter-spacing: .2em;
  pointer-events: none;
}

.compare-label-before {
  left: 1rem;
}

.compare-label-after {
  right: 1rem;
}

.proof-frame {
  width: min(1100px, calc(100vw - 7rem));
  margin: clamp(8rem, 13vw, 14rem) auto 0;
}

.image-button {
  position: relative;
  display: block;
  width: 100%;
  margin: 0;
  padding: 0;
  overflow: hidden;
  border: 0;
  background: #101010;
  cursor: zoom-in;
}

.image-button img {
  width: 100%;
  height: auto;
  transition: transform .7s cubic-bezier(.2, .7, .2, 1), filter .5s ease;
}

.image-button:hover img,
.image-button:focus-visible img {
  filter: brightness(1.04);
  transform: scale(1.012);
}

.image-button:focus-visible {
  outline: 1px solid var(--gold);
  outline-offset: 4px;
}

.zoom-hint {
  position: absolute;
  right: 1rem;
  bottom: 1rem;
  padding: .42rem .62rem;
  background: rgba(6, 6, 6, .78);
  color: var(--gold-light);
  font-size: .62rem;
  letter-spacing: .12em;
  opacity: .75;
}

.proof-frame figcaption {
  display: grid;
  grid-template-columns: max-content minmax(0, 1fr);
  gap: 2rem;
  align-items: start;
  padding: 1.5rem 0 0;
  border-top: 1px solid var(--line);
}

.proof-frame figcaption div {
  display: grid;
  grid-template-columns: minmax(260px, .65fr) 1fr;
  gap: 2rem;
  min-width: 0;
}

.proof-frame figcaption strong {
  font-family: var(--serif);
  font-size: clamp(1.3rem, 2vw, 2rem);
  font-weight: 500;
  line-height: 1.6;
}

.proof-frame figcaption p {
  color: var(--muted);
  font-size: .86rem;
  line-height: 1.9;
}

.story-block,
.finish-section,
.validation-section {
  padding-block: clamp(7rem, 12vw, 13rem);
}

.story-block-alt,
.finish-section {
  background: var(--bg-soft);
}

.story-heading {
  display: grid;
  grid-template-columns: .1fr minmax(0, 1.12fr) minmax(280px, .38fr);
  gap: clamp(1.5rem, 4vw, 5rem);
  align-items: start;
}

.story-heading h2 {
  font-size: clamp(2.65rem, 4vw, 4.8rem);
}

.story-summary {
  padding-top: 3.6rem;
  color: var(--muted);
  font-size: .9rem;
  line-height: 2.05;
}

.evidence-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(1.25rem, 3vw, 3rem);
  margin-top: clamp(6rem, 10vw, 10rem);
}

.evidence-pair figure {
  min-width: 0;
  background: var(--panel);
}

.evidence-pair .image-button {
  aspect-ratio: 4 / 3;
}

.evidence-pair .image-button img {
  height: 100%;
  object-fit: cover;
}

.evidence-pair figure:last-child .image-button {
  background: #080808;
}

.evidence-pair figure:last-child .image-button img {
  object-fit: contain;
}

.evidence-pair figcaption,
.detail-gallery figcaption,
.rear-finish figcaption {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.15rem 1.1rem;
  border-top: 1px solid var(--line);
}

.evidence-pair figcaption b,
.detail-gallery figcaption b,
.rear-finish figcaption b {
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 500;
}

.evidence-pair figcaption span,
.detail-gallery figcaption span,
.rear-finish figcaption span {
  color: var(--muted-2);
  font-size: .72rem;
}

.service-sequence,
.thermal-sequence {
  display: grid;
  gap: clamp(6rem, 11vw, 12rem);
  margin-top: clamp(7rem, 12vw, 12rem);
  padding: 0;
  list-style: none;
}

.service-sequence li,
.thermal-sequence li {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(260px, .46fr);
  gap: clamp(2.5rem, 7vw, 8rem);
  align-items: center;
}

.service-sequence li:nth-child(even),
.thermal-sequence li:nth-child(even) {
  grid-template-columns: minmax(260px, .46fr) minmax(0, 1.1fr);
}

.service-sequence li:nth-child(even) figure,
.thermal-sequence li:nth-child(even) figure {
  order: 2;
}

.service-sequence figure,
.thermal-sequence figure {
  min-width: 0;
}

.service-sequence li > div,
.thermal-sequence li > div,
.backplate-copy {
  min-width: 0;
}

.service-sequence h3,
.thermal-sequence h3,
.backplate-copy h3 {
  margin-top: .85rem;
  font-family: var(--serif);
  font-size: clamp(2rem, 2.35vw, 2.75rem);
  font-weight: 500;
  letter-spacing: -.025em;
  line-height: 1.4;
}

.service-sequence div p,
.thermal-sequence div p,
.backplate-copy p {
  margin-top: 1.2rem;
  color: var(--muted);
  font-size: .88rem;
  line-height: 2;
}

.detail-gallery {
  display: grid;
  grid-template-columns: 1.55fr .72fr .72fr;
  gap: clamp(1rem, 2vw, 2rem);
  align-items: start;
  margin-top: clamp(7rem, 12vw, 12rem);
}

.detail-gallery figure {
  min-width: 0;
  background: var(--panel);
}

.detail-gallery .image-button {
  aspect-ratio: 4 / 3;
}

.detail-gallery .image-button img {
  height: 100%;
  object-fit: cover;
}

.backplate-process {
  display: grid;
  grid-template-columns: minmax(260px, .42fr) minmax(0, 1fr);
  gap: clamp(3rem, 7vw, 8rem);
  align-items: start;
  margin-top: clamp(8rem, 13vw, 14rem);
  padding-top: clamp(3rem, 6vw, 6rem);
  border-top: 1px solid var(--line);
}

.backplate-copy {
  position: sticky;
  top: calc(var(--header-h) + 2rem);
}

.backplate-grid {
  display: grid;
  gap: 1.4rem;
}

.backplate-grid figure {
  min-width: 0;
  background: var(--panel);
}

.backplate-grid figcaption,
.fan-finish-grid figcaption {
  padding: .85rem 1rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: .72rem;
  letter-spacing: .08em;
}

.complete-card {
  position: relative;
  margin-top: clamp(7rem, 11vw, 11rem);
}

.complete-card .image-button {
  width: min(1180px, 100%);
}

.complete-card figcaption {
  position: absolute;
  right: 0;
  bottom: 8%;
  width: min(380px, 34%);
  padding: 2rem 2.2rem;
  border-left: 1px solid var(--gold);
  background: rgba(8, 8, 8, .9);
  backdrop-filter: blur(16px);
}

.complete-card figcaption strong {
  display: block;
  margin-top: .75rem;
  font-family: var(--serif);
  font-size: clamp(1.6rem, 2.6vw, 2.8rem);
  font-weight: 500;
  line-height: 1.4;
}

.complete-card figcaption p {
  margin-top: 1rem;
  color: var(--muted);
  font-size: .8rem;
  line-height: 1.9;
}

.fan-finish-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1rem, 2vw, 2rem);
  margin-top: clamp(5rem, 8vw, 8rem);
}

.fan-finish-grid figure {
  background: var(--panel);
}

.fan-finish-grid .image-button {
  aspect-ratio: 4 / 3;
}

.fan-finish-grid .image-button img {
  height: 100%;
  object-fit: cover;
}

.rear-finish {
  display: grid;
  grid-template-columns: 1.3fr .65fr;
  gap: clamp(1rem, 2vw, 2rem);
  margin-top: clamp(5rem, 8vw, 8rem);
}

.rear-finish figure {
  min-width: 0;
  background: var(--panel);
}

.rear-finish-main {
  grid-row: span 2;
}

.rear-finish .image-button {
  height: 100%;
}

.rear-finish .image-button img {
  height: 100%;
  object-fit: cover;
}

.rear-finish-main .image-button {
  aspect-ratio: 4 / 3;
}

.validation-section {
  background:
    radial-gradient(circle at 75% 20%, rgba(217, 174, 95, .06), transparent 26rem),
    #070707;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin-top: clamp(6rem, 10vw, 10rem);
  background: var(--line);
  border: 1px solid var(--line);
}

.metric-grid article {
  display: grid;
  align-content: start;
  min-height: 330px;
  padding: clamp(1.5rem, 3vw, 3rem);
  background: #0b0b0a;
}

.metric-grid article > p {
  color: var(--gold);
  font-family: var(--latin);
  font-size: .62rem;
  font-weight: 700;
  letter-spacing: .24em;
}

.metric-values {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: .6rem;
  margin-top: 2.8rem;
  font-family: var(--latin);
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

.metric-values span,
.metric-values strong {
  font-size: clamp(2.15rem, 3.35vw, 4rem);
  font-weight: 400;
  letter-spacing: -.05em;
}

.metric-values span {
  color: #7e7871;
}

.metric-values strong {
  color: var(--ink);
}

.metric-values small {
  margin-left: .15rem;
  font-size: .32em;
  letter-spacing: 0;
}

.metric-values i {
  color: var(--gold);
  font-family: var(--serif);
  font-size: 1rem;
  font-style: normal;
}

.metric-grid article > b {
  margin-top: 2.4rem;
  color: var(--gold-light);
  font-family: var(--latin);
  font-size: 1.25rem;
  letter-spacing: .05em;
}

.metric-grid article > small {
  align-self: end;
  margin-top: 1.4rem;
  color: var(--muted-2);
  font-size: .7rem;
  line-height: 1.8;
}

.test-evidence {
  display: grid;
  grid-template-columns: minmax(0, .88fr) minmax(0, 1.12fr);
  gap: clamp(1.25rem, 3vw, 3rem);
  align-items: start;
  margin-top: clamp(6rem, 10vw, 10rem);
}

.test-evidence figure {
  min-width: 0;
  background: #0c0c0b;
}

.test-evidence .image-button {
  display: grid;
  place-items: center;
  min-height: 520px;
  background: #050505;
}

.test-evidence .image-button img {
  width: 100%;
  height: auto;
  max-height: none;
  object-fit: contain;
}

.test-evidence figcaption {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.15rem;
  border-top: 1px solid var(--line);
}

.test-evidence figcaption span {
  color: var(--gold);
  font-family: var(--latin);
  font-size: .6rem;
  letter-spacing: .18em;
}

.test-evidence figcaption b {
  color: var(--muted);
  font-size: .72rem;
  font-weight: 400;
}

.validation-note {
  display: grid;
  grid-template-columns: max-content minmax(0, 1fr);
  gap: 2rem;
  margin-top: clamp(3.5rem, 6vw, 6rem);
  padding-top: 2rem;
  border-top: 1px solid var(--line);
}

.validation-note p {
  width: min(860px, 100%);
  color: #8f8880;
  font-size: .75rem;
  line-height: 1.95;
}

.finale {
  position: relative;
  display: grid;
  align-items: end;
  min-height: max(680px, 92svh);
  overflow: hidden;
  isolation: isolate;
}

.finale picture,
.finale picture img,
.finale-shade {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.finale picture {
  z-index: -3;
}

.finale picture img {
  object-fit: cover;
  object-position: 52% 50%;
  filter: saturate(.7) brightness(.72);
}

.finale-shade {
  z-index: -2;
  background:
    linear-gradient(90deg, rgba(6, 6, 6, .93) 0%, rgba(6, 6, 6, .65) 43%, rgba(6, 6, 6, .12) 77%),
    linear-gradient(0deg, rgba(6, 6, 6, .9), transparent 56%);
}

.finale-copy {
  width: min(1080px, calc(100vw - 5rem));
  margin: 0 0 clamp(4rem, 9vh, 8rem) clamp(2rem, 8vw, 10rem);
}

.finale-copy > p:not(.eyebrow) {
  width: min(640px, 100%);
  margin-top: 1.6rem;
  color: #b4aca3;
}

.finale-actions {
  display: flex;
  align-items: center;
  gap: 2rem;
  margin-top: 2.5rem;
}

.primary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: .75rem 1.35rem;
  border: 1px solid var(--gold);
  background: var(--gold);
  color: #0a0907;
  font-size: .76rem;
  font-weight: 700;
  letter-spacing: .08em;
  transition: background .25s ease, color .25s ease;
}

.primary-button:hover,
.primary-button:focus-visible {
  background: transparent;
  color: var(--gold-light);
}

.text-link {
  color: var(--gold-light);
  font-size: .75rem;
  letter-spacing: .08em;
}

.text-link span {
  margin-left: .5rem;
}

footer {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 130px;
  padding: 2rem clamp(1.25rem, 4vw, 5rem);
  border-top: 1px solid var(--line);
  background: #050505;
}

footer p {
  color: var(--muted-2);
  font-family: var(--latin);
  font-size: .55rem;
  letter-spacing: .18em;
}

footer > a:last-child {
  justify-self: end;
  color: var(--muted);
  font-size: .68rem;
  letter-spacing: .08em;
}

.footer-brand small {
  display: none;
}

.reveal {
  opacity: 0;
  transform: translateY(36px);
  transition:
    opacity .8s cubic-bezier(.2, .7, .2, 1),
    transform .9s cubic-bezier(.2, .7, .2, 1);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

.lightbox {
  width: 100vw;
  height: 100vh;
  max-width: none;
  max-height: none;
  margin: 0;
  padding: clamp(3rem, 6vw, 5rem);
  overflow: hidden;
  border: 0;
  background: rgba(4, 4, 4, .96);
  color: var(--ink);
}

.lightbox::backdrop {
  background: rgba(0, 0, 0, .82);
  backdrop-filter: blur(10px);
}

.lightbox figure {
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  gap: 1rem;
  width: 100%;
  height: 100%;
}

.lightbox img {
  width: 100%;
  height: 100%;
  min-height: 0;
  object-fit: contain;
}

.lightbox figcaption {
  color: var(--muted);
  font-size: .78rem;
  letter-spacing: .08em;
  text-align: center;
}

.lightbox-close {
  position: fixed;
  z-index: 2;
  top: 1rem;
  right: 1.25rem;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, .2);
  border-radius: 50%;
  background: rgba(10, 10, 10, .72);
  color: var(--ink);
  font-family: var(--latin);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
}

@media (max-width: 1180px) {
  :root {
    --shell: min(1100px, calc(100vw - 3.5rem));
  }

  .service-sequence h3,
  .thermal-sequence h3,
  .backplate-copy h3 {
    font-size: 1.85rem;
  }

  .story-heading {
    grid-template-columns: .1fr minmax(0, 1fr) minmax(250px, .46fr);
    gap: 2rem;
  }

  .proof-frame figcaption div {
    grid-template-columns: 1fr;
    gap: .8rem;
  }

  .backplate-process {
    grid-template-columns: 1fr;
  }

  .backplate-copy {
    position: static;
    max-width: 680px;
  }

  .metric-values span,
  .metric-values strong {
    font-size: clamp(1.8rem, 3.4vw, 3rem);
  }
}

@media (max-width: 980px) {
  :root {
    --header-h: 66px;
    --shell: calc(100vw - 2.5rem);
  }

  .site-header {
    grid-template-columns: 1fr auto;
    padding-inline: 1.25rem;
  }

  .chapter-nav {
    display: none;
  }

  .page-mark {
    grid-column: 2;
  }

  .brand small {
    display: none;
  }

  .hero-spec {
    display: none;
  }

  .hero-copy,
  .finale-copy {
    width: calc(100vw - 2.5rem);
    margin-left: 1.25rem;
  }

  .hero h1 {
    font-size: clamp(3rem, 8.3vw, 5.2rem);
  }

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

  .intro .section-number {
    margin-bottom: 1rem;
  }

  .comparison-wrap,
  .comparison-wrap-reverse {
    grid-template-columns: 1fr;
    width: calc(100vw - 2.5rem);
    padding-inline: 0;
  }

  .comparison-wrap-reverse .comparison-copy,
  .comparison-wrap-reverse .comparison {
    order: initial;
  }

  .comparison-copy {
    max-width: 680px;
    padding-bottom: 0;
  }

  .story-heading {
    grid-template-columns: .08fr 1fr;
  }

  .story-summary {
    grid-column: 2;
    padding-top: 0;
  }

  .service-sequence li,
  .service-sequence li:nth-child(even),
  .thermal-sequence li,
  .thermal-sequence li:nth-child(even) {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .service-sequence li:nth-child(even) figure,
  .thermal-sequence li:nth-child(even) figure {
    order: initial;
  }

  .detail-gallery {
    grid-template-columns: 1fr 1fr;
  }

  .detail-gallery-wide {
    grid-column: 1 / -1;
  }

  .complete-card figcaption {
    position: relative;
    right: auto;
    bottom: auto;
    width: 100%;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

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

  .metric-grid article {
    min-height: 250px;
  }

  .metric-values {
    justify-content: flex-start;
    gap: 1.25rem;
  }

  .metric-values span,
  .metric-values strong {
    font-size: clamp(2.7rem, 8vw, 4.5rem);
  }

  .test-evidence {
    grid-template-columns: 1fr;
  }

  .test-evidence .image-button {
    min-height: 0;
  }

  footer {
    grid-template-columns: 1fr auto;
  }

  footer p {
    display: none;
  }
}

@media (max-width: 720px) {
  :root {
    --shell: calc(100vw - 2rem);
  }

  .headline-line {
    width: auto;
    white-space: normal;
  }

  .comparison-kicker,
  .proof-frame figcaption > span,
  .service-sequence div > span,
  .thermal-sequence div > span,
  .backplate-copy > span,
  .complete-card figcaption > span,
  .validation-note > span {
    font-size: .6rem;
    letter-spacing: .18em;
  }

  .hero {
    min-height: 780px;
  }

  .hero-media img {
    object-position: 60% center;
  }

  .hero-shade {
    background:
      linear-gradient(0deg, rgba(5, 5, 5, .97) 0%, rgba(5, 5, 5, .62) 64%, rgba(5, 5, 5, .25) 100%),
      linear-gradient(90deg, rgba(5, 5, 5, .55), transparent);
  }

  .hero-copy,
  .finale-copy {
    width: calc(100vw - 2rem);
    margin-right: 1rem;
    margin-bottom: 3.5rem;
    margin-left: 1rem;
  }

  .hero h1,
  .intro h2,
  .story-heading h2,
  .finale h2 {
    font-size: clamp(2.45rem, 11.5vw, 4rem);
    line-height: 1.3;
  }

  .hero-lead {
    margin-top: 1.4rem;
    font-size: .86rem;
    line-height: 1.85;
  }

  .scroll-cue {
    margin-top: 1.7rem;
  }

  .intro,
  .story-block,
  .finish-section,
  .validation-section {
    padding-block: 6rem;
  }

  .comparison-wrap {
    width: calc(100vw - 2rem);
    margin-top: 4.5rem;
  }

  .comparison-copy h3,
  .service-sequence h3,
  .thermal-sequence h3,
  .backplate-copy h3 {
    font-size: clamp(1.75rem, 8vw, 2.6rem);
  }

  .comparison-handle i {
    width: 46px;
    height: 46px;
  }

  .comparison-handle i::before {
    left: 11px;
  }

  .comparison-handle i::after {
    right: 11px;
  }

  .proof-frame {
    width: var(--shell);
    margin-top: 6rem;
  }

  .proof-frame figcaption {
    grid-template-columns: 1fr;
    gap: .8rem;
  }

  .proof-frame figcaption div {
    grid-template-columns: 1fr;
  }

  .story-heading {
    grid-template-columns: 1fr;
    gap: .8rem;
  }

  .story-summary {
    grid-column: 1;
    margin-top: 1rem;
  }

  .evidence-pair,
  .detail-gallery,
  .fan-finish-grid,
  .rear-finish {
    grid-template-columns: 1fr;
  }

  .evidence-pair {
    margin-top: 4.5rem;
  }

  .detail-gallery-wide {
    grid-column: auto;
  }

  .rear-finish-main {
    grid-row: auto;
  }

  .rear-finish .image-button,
  .rear-finish-main .image-button {
    height: auto;
    aspect-ratio: 4 / 3;
  }

  .service-sequence,
  .thermal-sequence {
    gap: 5.5rem;
    margin-top: 5rem;
  }

  .backplate-process {
    margin-top: 6rem;
  }

  .complete-card {
    margin-top: 5rem;
  }

  .complete-card figcaption {
    padding: 1.4rem 1rem;
  }

  .metric-grid {
    margin-top: 4.5rem;
  }

  .metric-grid article {
    min-height: 230px;
    padding: 1.5rem;
  }

  .metric-values {
    margin-top: 2rem;
  }

  .metric-values span,
  .metric-values strong {
    font-size: clamp(2.3rem, 12vw, 3.5rem);
  }

  .test-evidence {
    margin-top: 4.5rem;
  }

  .validation-note {
    grid-template-columns: 1fr;
    gap: .9rem;
  }

  .finale {
    min-height: 720px;
  }

  .finale picture img {
    object-position: 58% center;
  }

  .finale-shade {
    background:
      linear-gradient(0deg, rgba(6, 6, 6, .97) 0%, rgba(6, 6, 6, .68) 65%, rgba(6, 6, 6, .22) 100%);
  }

  .finale-actions {
    align-items: flex-start;
    flex-direction: column;
    gap: 1.25rem;
  }

  footer {
    min-height: 110px;
    padding: 1.5rem 1rem;
  }

  .lightbox {
    padding: 3.5rem .5rem 1rem;
  }

  .lightbox-close {
    top: .7rem;
    right: .7rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}