@charset "UTF-8";

@font-face {
  font-family: "Cormorant Garamond";
  src: url("assets/fonts/cormorant-garamond-latin.woff2") format("woff2");
  font-weight: 300 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Cormorant Garamond";
  src: url("assets/fonts/cormorant-garamond-italic-latin.woff2") format("woff2");
  font-weight: 300 700;
  font-style: italic;
  font-display: swap;
}
@font-face {
  font-family: "Plus Jakarta Sans";
  src: url("assets/fonts/plus-jakarta-sans-latin.woff2") format("woff2");
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Noto Serif SC Subset";
  src: url("assets/fonts/noto-serif-sc-subset.woff2") format("woff2");
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Noto Sans SC Subset";
  src: url("assets/fonts/noto-sans-sc-subset.woff2") format("woff2");
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Noto Serif KR Subset";
  src: url("assets/fonts/noto-serif-kr-subset.woff2") format("woff2");
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Noto Sans KR Subset";
  src: url("assets/fonts/noto-sans-kr-subset.woff2") format("woff2");
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
}

:root {
  --celadon: #5f9d9c;
  --celadon-light: #a8d3cc;
  --celadon-mid: #84bab5;
  --celadon-tint: #edf5f3;
  --ivory: #fffaf0;
  --parchment: #f6f0e2;
  --ink: #202640;
  --ink-deep: #171c30;
  --muted: #555867;
  --brass: #b3a07b;
  --brass-light: #e6d6ab;
  --brass-dark: #7f6f50;
  --line: #ded9cb;
  --red: #eb7b74;
  --display: "Cormorant Garamond", Cambria, "Times New Roman", serif;
  --serif: "Cormorant Garamond", Cambria, "Times New Roman", serif;
  --sans: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --page: min(1440px, calc(100vw - 96px));
  --seigaiha: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='80' height='40' viewBox='0 0 80 40'%3E%3Cdefs%3E%3Cg id='w' fill='%235f9d9c' stroke='%23a8d3cc' stroke-width='0.85' stroke-opacity='0.42'%3E%3Ccircle r='40'/%3E%3Ccircle r='30'/%3E%3Ccircle r='20'/%3E%3Ccircle r='10'/%3E%3C/g%3E%3C/defs%3E%3Cuse href='%23w' x='0' y='0'/%3E%3Cuse href='%23w' x='80' y='0'/%3E%3Cuse href='%23w' x='40' y='20'/%3E%3Cuse href='%23w' x='0' y='40'/%3E%3Cuse href='%23w' x='80' y='40'/%3E%3Cuse href='%23w' x='40' y='60'/%3E%3C/svg%3E");
}

html[lang="ko"] {
  --serif: "Cormorant Garamond", "Noto Serif KR Subset", "AppleMyungjo", "Batang", serif;
  --sans: "Plus Jakarta Sans", "Noto Sans KR Subset", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
}

html[lang="zh-CN"] {
  --serif: "Cormorant Garamond", "Noto Serif SC Subset", "Songti SC", "STSong", "SimSun", serif;
  --sans: "Plus Jakarta Sans", "Noto Sans SC Subset", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
  overflow-anchor: none;
}
body {
  margin: 0;
  color: var(--ink);
  background: var(--ivory);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  font-variant-numeric: lining-nums proportional-nums;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: clip;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; touch-action: manipulation; }
button { font: inherit; }
:focus-visible { outline: 2px solid var(--red); outline-offset: 4px; }
::selection { color: var(--ivory); background: var(--ink); }

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 10px 16px;
  color: var(--ivory);
  background: var(--ink);
  border: 1px solid var(--brass);
  font-size: 12px;
  transform: translateY(-160%);
}
.skip-link:focus { transform: translateY(0); }

/* Header */
.site-header {
  position: sticky;
  z-index: 50;
  top: 0;
  background: rgba(255, 250, 240, 0.94);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--brass);
  box-shadow: 0 1px 0 rgba(255, 250, 240, 0.8), 0 4px 20px rgba(32, 38, 64, 0.04);
}
.header-inner {
  width: var(--page);
  min-height: 74px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
}
.brand-type {
  display: grid;
  line-height: 1.05;
}
.brand-type strong {
  font-family: var(--display);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.22em;
}
.brand-type small {
  margin-top: 4px;
  color: var(--brass-dark);
  font-family: var(--display);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.26em;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: clamp(22px, 2.6vw, 44px);
  margin-left: auto;
}
.main-nav a {
  position: relative;
  padding: 4px 0;
  color: var(--ink);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.04em;
}
.main-nav a::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -2px;
  left: 0;
  height: 1px;
  background: var(--brass-dark);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.25s ease;
}
.main-nav a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}
.language-switch {
  display: inline-flex;
  background: var(--ivory);
  border: 1px solid var(--brass);
  padding: 2px;
  flex-shrink: 0;
}
.language-switch button {
  min-width: 40px;
  min-height: 34px;
  padding: 0 8px;
  border: 0;
  border-right: 1px solid var(--line);
  color: var(--ink);
  background: transparent;
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease;
}
.language-switch button:last-child { border-right: 0; }
.language-switch button[aria-pressed="true"] {
  color: var(--ivory);
  background: var(--ink);
}
.language-switch button:hover:not([aria-pressed="true"]) {
  background: var(--parchment);
}

/* Shared Ornamental Elements */
.eyebrow {
  margin: 0 0 18px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--brass-dark);
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.eyebrow-diamond {
  width: 7px;
  height: 7px;
  background: var(--celadon);
  border: 1px solid var(--brass-dark);
  transform: rotate(45deg);
  flex-shrink: 0;
}
.hero-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 24px 0;
}
.hero-divider span {
  flex: 1;
  height: 1px;
  background: var(--brass);
}
.hero-divider i {
  width: 8px;
  height: 8px;
  border: 1px solid var(--brass-dark);
  background: var(--celadon);
  transform: rotate(45deg);
}

h1, h2, h3, p { overflow-wrap: break-word; }

/* Hero Section — True Celadon Oracle Architecture */
.hero {
  position: relative;
  padding: clamp(24px, 3vw, 44px) 0;
  background-color: var(--celadon);
  background-image:
    radial-gradient(circle at 20% 15%, rgba(255, 250, 240, 0.16), transparent 45%),
    radial-gradient(circle at 85% 85%, rgba(23, 28, 48, 0.22), transparent 55%),
    var(--seigaiha);
  background-size: 100% 100%, 100% 100%, 80px 40px;
  border-bottom: 2px solid var(--brass-dark);
}
.hero-frame {
  width: var(--page);
  margin: 0 auto;
  padding: clamp(32px, 4vw, 56px);
  background: rgba(255, 250, 240, 0.96);
  border: 1px solid var(--brass-light);
  box-shadow:
    inset 0 0 0 4px var(--ivory),
    inset 0 0 0 5px var(--brass),
    0 28px 64px rgba(23, 28, 48, 0.22);
}
.hero-inner {
  display: grid;
  grid-template-columns: minmax(320px, 0.78fr) minmax(520px, 1.22fr);
  align-items: center;
  gap: clamp(36px, 4.5vw, 68px);
}
.hero-copy {
  position: relative;
  z-index: 2;
}
h1 {
  margin: 0;
  color: var(--ink);
  font-family: var(--display);
  font-size: clamp(54px, 5.6vw, 88px);
  font-weight: 500;
  line-height: 0.94;
  letter-spacing: 0.01em;
}
h1 em {
  display: block;
  margin-top: 4px;
  color: var(--ink);
  font-style: italic;
  font-weight: 400;
  letter-spacing: 0.03em;
}
.hero-claim {
  display: flex;
  align-items: baseline;
  gap: 16px;
  flex-wrap: wrap;
}
.claim-badge {
  padding: 4px 12px;
  color: var(--ivory);
  background: var(--ink);
  border: 1px solid var(--brass);
  font-family: var(--display);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.14em;
  clip-path: polygon(6px 0, calc(100% - 6px) 0, 100% 50%, calc(100% - 6px) 100%, 6px 100%, 0 50%);
}
.hero-claim h2 {
  margin: 0;
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(28px, 2.8vw, 42px);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
}
.hero-intro {
  max-width: 440px;
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.75;
}
.hero-actions {
  margin-top: 28px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 22px;
}
.button {
  min-height: 48px;
  padding: 12px 24px;
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 18px;
  border: 1px solid var(--brass);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: background-color 0.22s ease, color 0.22s ease, transform 0.22s ease, box-shadow 0.22s ease;
}
.button:hover {
  transform: translateY(-2px);
}
.button-dark {
  color: var(--ivory);
  background: var(--ink);
  border-color: var(--ink);
  box-shadow: 0 8px 20px rgba(32, 38, 64, 0.16);
}
.button-dark:hover {
  color: var(--ink);
  background: var(--brass-light);
  border-color: var(--brass-dark);
}
.text-link {
  padding: 6px 0;
  border-bottom: 1px solid var(--brass-dark);
  color: var(--ink);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.text-link:hover {
  color: var(--brass-dark);
}

.hero-instrument {
  margin: 0;
  width: 100%;
  max-width: 820px;
  justify-self: end;
}
.instrument-bezel {
  padding: 8px;
  background: var(--ink);
  border: 1px solid var(--brass);
  box-shadow: 0 22px 48px rgba(32, 38, 64, 0.18);
}
.instrument-bezel img {
  width: 100%;
  border: 1px solid rgba(230, 214, 171, 0.35);
}
.hero-instrument figcaption {
  margin-top: 12px;
  padding: 10px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px 20px;
  background: var(--parchment);
  border: 1px solid var(--line);
  font-size: 12px;
}
.instrument-id {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.instrument-id span {
  color: var(--brass-dark);
  font-weight: 600;
  letter-spacing: 0.1em;
}
.instrument-id strong {
  font-family: var(--display);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.12em;
}
.instrument-id em {
  padding-left: 10px;
  border-left: 1px solid var(--brass);
  color: var(--muted);
  font-style: normal;
  font-weight: 500;
}
.instrument-latency {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
}
.instrument-latency small {
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
}
.instrument-latency strong {
  font-family: var(--display);
  font-size: 22px;
  font-weight: 600;
  line-height: 1;
}
.instrument-latency strong span {
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 500;
}

.hero-foot {
  margin-top: clamp(28px, 3.5vw, 44px);
  padding-top: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px 28px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
}
.foot-diamond {
  width: 5px;
  height: 5px;
  background: var(--brass);
  transform: rotate(45deg);
}

/* Default Latency Overview (#evidence) */
.evidence {
  padding: clamp(72px, 8vw, 116px) 0;
  color: var(--ivory);
  background-color: var(--ink);
  background-image: radial-gradient(ellipse at 50% 0%, rgba(95, 157, 156, 0.14), transparent 65%);
  border-bottom: 2px solid var(--brass);
}
.evidence-heading {
  width: var(--page);
  margin: 0 auto clamp(40px, 4.5vw, 60px);
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  column-gap: 56px;
  align-items: end;
}
.evidence-heading .eyebrow {
  color: var(--brass-light);
}
.evidence-heading .eyebrow-diamond {
  border-color: var(--brass-light);
}
.evidence-heading h2,
.section-heading h2,
.principles-heading h2,
.closing h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(38px, 4.4vw, 64px);
  font-weight: 500;
  line-height: 1.08;
  letter-spacing: -0.01em;
}
.evidence-intro {
  max-width: 460px;
  margin: 0 0 6px;
  justify-self: end;
  color: var(--brass-light);
  font-size: 15px;
  line-height: 1.7;
}
.evidence-ledger {
  width: var(--page);
  margin: 0 auto;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(11, minmax(0, 1fr));
  border-top: 1px solid var(--brass);
  border-left: 1px solid var(--brass);
  list-style: none;
  background: rgba(255, 250, 240, 0.02);
}
.evidence-ledger li {
  min-width: 0;
  border-right: 1px solid var(--brass);
  border-bottom: 1px solid var(--brass);
}
.evidence-ledger a {
  height: 100%;
  min-height: 176px;
  padding: 18px 12px 16px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 18px;
  transition: background-color 0.2s ease, box-shadow 0.2s ease;
}
.evidence-ledger a:hover,
.evidence-ledger a:focus-visible {
  background: rgba(230, 214, 171, 0.11);
}
.evidence-ledger a:focus-visible {
  outline: 2px solid var(--brass-light);
  outline-offset: -2px;
}
.ledger-top {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.ledger-top em {
  color: var(--brass-light);
  font-family: var(--display);
  font-size: 16px;
  font-style: italic;
  line-height: 1;
}
.ledger-top small {
  color: var(--ivory);
  font-family: var(--display);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.evidence-ledger a:hover .ledger-top small,
.evidence-ledger a:focus-visible .ledger-top small {
  color: var(--brass-light);
}
.evidence-ledger strong {
  display: block;
  color: var(--ivory);
  font-family: var(--display);
  font-size: clamp(32px, 2.8vw, 46px);
  font-weight: 500;
  line-height: 1;
  white-space: nowrap;
}
.ledger-unit {
  display: block;
  color: var(--brass-light);
  font-size: 12px;
  font-weight: 500;
  line-height: 1.3;
}

/* Collection Section (#collection) */
.collection {
  padding: clamp(76px, 8vw, 128px) 0 0;
}
.section-heading {
  width: var(--page);
  margin: 0 auto clamp(48px, 5.5vw, 76px);
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  column-gap: 56px;
  align-items: end;
}
.section-heading > p:last-child {
  max-width: 440px;
  margin: 0 0 6px;
  justify-self: end;
  color: var(--muted);
  font-size: 15px;
}

/* Individual Product Showcase */
.products {
  border-top: 1px solid var(--brass);
}
.product {
  position: relative;
  padding: clamp(68px, 7.5vw, 112px) 0;
  background: var(--ivory);
  border-bottom: 1px solid var(--brass);
  overflow: hidden;
}
.product:nth-child(even) {
  background: var(--parchment);
}
.product--tint {
  background: var(--celadon-tint);
}
.product.product--dark {
  color: var(--ivory);
  background-color: var(--ink);
  background-image: radial-gradient(circle at 80% 20%, rgba(95, 157, 156, 0.14), transparent 55%);
}
.product-inner {
  position: relative;
  width: var(--page);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(350px, 0.85fr);
  align-items: center;
  gap: clamp(44px, 5vw, 80px);
}
.product:nth-child(even) .product-inner {
  grid-template-columns: minmax(350px, 0.85fr) minmax(0, 1.3fr);
}
.product:nth-child(even) .product-figure { order: 2; }
.product:nth-child(even) .product-copy { order: 1; }

.product-figure {
  position: relative;
  min-width: 0;
  margin: 0;
}
.interface-button {
  position: relative;
  width: 100%;
  padding: 8px;
  display: block;
  color: var(--ink);
  background: var(--ivory);
  border: 1px solid var(--brass);
  box-shadow:
    inset 0 0 0 1px var(--line),
    0 22px 48px -12px rgba(32, 38, 64, 0.16);
  cursor: zoom-in;
  text-align: left;
  transition: transform 0.28s cubic-bezier(0.2, 0.7, 0.2, 1), box-shadow 0.28s ease, border-color 0.28s ease;
}
.interface-button:hover {
  transform: translateY(-3px);
  border-color: var(--ink);
  box-shadow:
    inset 0 0 0 1px var(--brass),
    0 28px 56px -12px rgba(32, 38, 64, 0.24);
}
.interface-button img {
  width: 100%;
}
.product-figure figcaption {
  margin-top: 12px;
  padding: 0 4px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
}
.zoom-cue {
  color: var(--ink);
  border-bottom: 1px solid var(--brass);
  padding-bottom: 1px;
}

.product-copy {
  position: relative;
  z-index: 1;
  min-width: 0;
}
.product-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}
.serial-pill {
  padding: 3px 12px;
  color: var(--ink);
  background: rgba(179, 160, 123, 0.2);
  border: 1px solid var(--brass);
  font-family: var(--display);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  clip-path: polygon(5px 0, calc(100% - 5px) 0, 100% 50%, calc(100% - 5px) 100%, 5px 100%, 0 50%);
}
.product-function {
  margin: 0;
  color: var(--brass-dark);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.product-heading {
  padding-bottom: 18px;
  border-bottom: 1px solid var(--brass);
}
.product-heading h3 {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(42px, 4.2vw, 60px);
  font-weight: 500;
  line-height: 1;
  letter-spacing: 0.14em;
}
.product-tagline {
  margin: 22px 0;
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(22px, 2vw, 28px);
  font-style: italic;
  font-weight: 500;
  line-height: 1.35;
}
html[lang="ko"] .product-tagline,
html[lang="zh-CN"] .product-tagline {
  font-style: normal;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.latency {
  margin: 0 0 22px;
  padding: 12px 16px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  background: rgba(179, 160, 123, 0.11);
  border-top: 1px solid var(--brass);
  border-bottom: 1px solid var(--brass);
}
.latency > span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
}
.latency strong {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  color: var(--ink);
  font-family: var(--display);
  font-size: clamp(28px, 2.5vw, 36px);
  font-weight: 600;
  line-height: 1;
  white-space: nowrap;
}
.latency strong small {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 500;
}

.facts {
  margin: 0;
  padding: 0;
  list-style: none;
}
.facts li {
  position: relative;
  padding: 12px 0 12px 22px;
  border-bottom: 1px solid var(--line);
  color: #363a49;
  font-size: 14px;
  line-height: 1.65;
}
.facts li:last-child {
  border-bottom: 0;
}
.facts li::before {
  content: "";
  position: absolute;
  top: 20px;
  left: 2px;
  width: 6px;
  height: 6px;
  background: var(--celadon);
  border: 1px solid var(--brass-dark);
  transform: rotate(45deg);
}

/* Dark Variant (Iris) */
.product--dark .interface-button {
  background: var(--ink-deep);
  border-color: var(--brass);
  box-shadow: 0 24px 52px rgba(0, 0, 0, 0.36);
}
.product--dark .product-figure figcaption,
.product--dark .zoom-cue,
.product--dark .product-function {
  color: var(--brass-light);
}
.product--dark .serial-pill {
  color: var(--ivory);
  background: rgba(230, 214, 171, 0.14);
  border-color: var(--brass-light);
}
.product--dark .product-tagline,
.product--dark .latency strong {
  color: var(--ivory);
}
.product--dark .latency {
  background: rgba(230, 214, 171, 0.08);
  border-color: rgba(230, 214, 171, 0.4);
}
.product--dark .latency > span {
  color: var(--brass-light);
}
.product--dark .facts li {
  color: rgba(255, 250, 240, 0.9);
  border-bottom-color: rgba(230, 214, 171, 0.22);
}
.product--dark .facts li::before {
  border-color: var(--brass-light);
}

/* Shared Specifications (#principles) */
.principles {
  padding: clamp(76px, 9vw, 132px) 0;
  color: var(--ivory);
  background-color: var(--ink);
  background-image: radial-gradient(circle at 15% 85%, rgba(95, 157, 156, 0.14), transparent 55%);
  border-bottom: 2px solid var(--brass);
}
.principles-inner {
  width: var(--page);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 0.88fr 1.12fr;
  gap: clamp(48px, 7vw, 112px);
  align-items: start;
}
.principles-heading .eyebrow {
  color: var(--brass-light);
}
.principles-heading .eyebrow-diamond {
  border-color: var(--brass-light);
}
.principles-heading > p:last-child {
  max-width: 420px;
  margin: 22px 0 0;
  color: var(--brass-light);
  font-size: 15px;
  line-height: 1.75;
}
.specification-list {
  margin: 0;
  border-top: 1px solid rgba(230, 214, 171, 0.4);
}
.specification-list > div {
  padding: 22px 0;
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 28px;
  border-bottom: 1px solid rgba(230, 214, 171, 0.28);
}
.specification-list dt {
  color: var(--brass-light);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
}
.specification-list dd {
  margin: 0;
  color: var(--ivory);
  font-size: 15px;
  line-height: 1.65;
}

/* Closing Section */
.closing {
  position: relative;
  padding: clamp(64px, 7vw, 108px) 0;
  background-color: var(--celadon);
  background-image:
    radial-gradient(circle at 50% 50%, rgba(255, 250, 240, 0.14), transparent 60%),
    var(--seigaiha);
  background-size: 100% 100%, 80px 40px;
  border-bottom: 1px solid var(--brass-dark);
}
.closing-frame {
  width: var(--page);
  margin: 0 auto;
  display: grid;
  place-items: center;
}
.closing-cartouche {
  width: min(860px, 100%);
  padding: clamp(44px, 5vw, 72px) clamp(28px, 5vw, 68px);
  background: var(--ivory);
  border: 1px solid var(--brass-light);
  box-shadow:
    inset 0 0 0 4px var(--ivory),
    inset 0 0 0 5px var(--brass),
    0 24px 56px rgba(23, 28, 48, 0.22);
  text-align: center;
}
.closing-cartouche h2 {
  font-size: clamp(32px, 3.6vw, 52px);
}
.closing-cartouche .eyebrow {
  justify-content: center;
  margin-bottom: 16px;
}
.download-meta {
  margin: 0 0 22px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
}
.download-actions {
  margin: 0 0 24px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}
.download-note {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
}
.download-hash {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.5;
  overflow-wrap: anywhere;
}
.download-hash code {
  font-family: Consolas, "SF Mono", Menlo, monospace;
}
.closing-cartouche .hero-divider {
  max-width: 240px;
  margin: 26px auto 30px;
}

/* Footer */
.site-footer {
  width: var(--page);
  min-height: 96px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  font-size: 12px;
}
.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--display);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.16em;
}
.site-footer p {
  color: var(--muted);
}
.site-footer > a:last-child {
  padding-bottom: 2px;
  border-bottom: 1px solid var(--brass-dark);
  font-weight: 600;
}

/* Dialog Lightbox */
.interface-dialog {
  width: min(1160px, calc(100vw - 48px));
  max-width: none;
  max-height: calc(100dvh - 48px);
  padding: 0;
  color: var(--ink);
  background: var(--ivory);
  border: 2px solid var(--brass);
  box-shadow: 0 32px 80px rgba(0, 0, 0, 0.45);
}
.interface-dialog::backdrop {
  background: rgba(23, 28, 48, 0.86);
  backdrop-filter: blur(4px);
}
.dialog-bar {
  min-height: 52px;
  padding-left: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  background: var(--parchment);
  border-bottom: 1px solid var(--brass);
}
.dialog-bar p {
  margin: 0;
  font-family: var(--display);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.08em;
}
.dialog-bar button {
  align-self: stretch;
  width: 52px;
  padding: 0;
  color: var(--ivory);
  background: var(--ink);
  border: 0;
  font-size: 24px;
  cursor: pointer;
}
.interface-dialog > img {
  width: 100%;
  max-height: calc(100dvh - 104px);
  object-fit: contain;
  background: var(--ink);
}

/* Keep product names, brand, and Roman numerals in Cormorant Garamond across all languages */
html[lang="zh-CN"] h1,
html[lang="zh-CN"] h1 em,
html[lang="zh-CN"] .product-heading h3,
html[lang="zh-CN"] .latency strong,
html[lang="zh-CN"] .evidence-ledger strong,
html[lang="zh-CN"] .brand-type strong,
html[lang="zh-CN"] .footer-brand,
html[lang="ko"] h1,
html[lang="ko"] h1 em,
html[lang="ko"] .product-heading h3,
html[lang="ko"] .latency strong,
html[lang="ko"] .evidence-ledger strong,
html[lang="ko"] .brand-type strong,
html[lang="ko"] .footer-brand {
  font-family: var(--display);
}

html[lang="zh-CN"] .evidence-heading h2,
html[lang="zh-CN"] .section-heading h2,
html[lang="zh-CN"] .principles-heading h2,
html[lang="zh-CN"] .closing h2,
html[lang="zh-CN"] .hero-claim h2 {
  font-weight: 600;
  letter-spacing: 0.02em;
}

html[lang="ko"] .evidence-heading h2,
html[lang="ko"] .section-heading h2,
html[lang="ko"] .principles-heading h2,
html[lang="ko"] .closing h2,
html[lang="ko"] .hero-claim h2 {
  font-weight: 600;
  letter-spacing: -0.015em;
}

/* Wide Desktop (2560px) */
@media (min-width: 1800px) {
  :root { --page: min(1680px, calc(100vw - 160px)); }
  .hero-frame { padding: 64px; }
  .product-inner { gap: 96px; }
  .facts li { font-size: 15px; }
}

/* Tablet / Smaller Desktop */
@media (max-width: 1240px) {
  :root { --page: calc(100vw - 56px); }
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  .hero-instrument { justify-self: start; }
  .evidence-ledger {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .evidence-ledger li:last-child {
    grid-column: span 2;
  }
  .product-inner,
  .product:nth-child(even) .product-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .product-figure { max-width: 820px; }
  .product-copy { max-width: 680px; }
  .product:nth-child(even) .product-figure { order: 1; }
  .product:nth-child(even) .product-copy { order: 2; }
}

@media (max-width: 860px) {
  :root { --page: calc(100vw - 40px); }
  html { scroll-padding-top: 76px; }
  .header-inner { min-height: 66px; gap: 16px; }
  .main-nav { display: none; }
  .hero-inner { display: flex; flex-direction: column; gap: 32px; }
  .hero-instrument { order: 1; }
  .hero-copy { order: 2; }
  .evidence-heading,
  .section-heading,
  .principles-inner {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .evidence-intro,
  .section-heading > p:last-child {
    justify-self: start;
  }
  .site-footer {
    padding: 28px 0;
    flex-wrap: wrap;
  }
}

/* Mobile (375px) */
@media (max-width: 540px) {
  :root { --page: calc(100vw - 28px); }
  body { font-size: 15px; }
  .header-inner { min-height: 62px; }
  .brand { gap: 10px; }
  .brand img { width: 24px; height: 27px; }
  .brand-type strong { font-size: 14px; letter-spacing: 0.16em; }
  .brand-type small { font-size: 12px; letter-spacing: 0.16em; }
  .language-switch button { min-width: 36px; min-height: 32px; padding: 0 6px; }

  .hero { padding: 14px 0 22px; }
  .hero-frame { padding: 18px 16px 22px; }
  .instrument-bezel { padding: 5px; }
  .hero-instrument figcaption { padding: 10px 12px; }
  h1 { font-size: clamp(46px, 13vw, 64px); }
  .hero-claim h2 { font-size: 26px; }
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
    gap: 14px;
  }
  .text-link { align-self: flex-start; }
  .hero-foot { gap: 10px 14px; font-size: 12px; letter-spacing: 0.08em; }

  .evidence { padding: 56px 0; }
  .evidence-heading h2,
  .section-heading h2,
  .principles-heading h2,
  .closing h2 {
    font-size: 32px;
  }
  .evidence-ledger {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .evidence-ledger li:last-child {
    grid-column: 1 / -1;
  }
  .evidence-ledger a {
    min-height: 118px;
    padding: 14px 12px;
    gap: 10px;
  }
  .evidence-ledger strong { font-size: 32px; }

  .collection { padding-top: 56px; }
  .section-heading { margin-bottom: 40px; }

  .product { padding: 48px 0 54px; }
  .product-inner { gap: 28px; }
  .interface-button { padding: 5px; }
  .product-figure figcaption {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }
  .product-heading h3 {
    font-size: 36px;
    letter-spacing: 0.1em;
  }
  .product-tagline {
    margin: 18px 0;
    font-size: 21px;
  }
  .latency { padding: 10px 14px; }
  .latency strong { font-size: 26px; }
  .facts li { font-size: 13px; }

  .principles { padding: 60px 0; }
  .specification-list > div {
    padding: 18px 0;
    grid-template-columns: 1fr;
    gap: 6px;
  }
  .specification-list dd { font-size: 14px; }

  .closing { padding: 44px 0; }
  .closing-cartouche { padding: 36px 20px; }

  .site-footer {
    min-height: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
  .site-footer p { margin: 0; }
  .interface-dialog {
    width: calc(100vw - 24px);
    max-height: calc(100dvh - 24px);
  }
  .dialog-bar p { font-size: 14px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
  .interface-button:hover,
  .button:hover {
    transform: none;
  }
}
@media (max-width: 480px) {
  html[lang="zh-CN"] .closing-cartouche h2 {
    font-size: 25px;
  }
}