/* ==========================================================================
   Shanghai Zenith Biotech — design system
   "The Monograph": the site set like a typeset scientific document.
   Journal paper, bench-black ink, malachite accent. Serif (STIX Two Text)
   for editorial headlines, IBM Plex Mono for data/labels, Inter for body.
   Flat surfaces — depth comes from rules and spacing, not shadows.
   Light theme only. Self-hosted assets only (CSP). Generated pages are
   built from src/ — see build.js.
   ========================================================================== */

/* --- Fonts ----------------------------------------------------------------- */

@font-face {
  font-family: "Inter";
  src: url("../fonts/InterVariable.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "STIX Two Text";
  src: url("../fonts/STIXTwoText-Variable.woff2") format("woff2");
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "STIX Two Text";
  src: url("../fonts/STIXTwoText-Italic-Variable.woff2") format("woff2");
  font-weight: 400 700;
  font-style: italic;
  font-display: swap;
}

@font-face {
  font-family: "IBM Plex Mono";
  src: url("../fonts/IBMPlexMono-Regular.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "IBM Plex Mono";
  src: url("../fonts/IBMPlexMono-Medium.woff2") format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

/* --- Tokens ---------------------------------------------------------------- */

:root {
  --font-serif: "STIX Two Text", Georgia, "Times New Roman", serif;
  --font-sans: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "Cascadia Mono", Consolas, "Courier New", monospace;

  --paper: #fbfbf9;
  --paper-wash: #f2f4f0;
  --ink: #1d2521;
  --heading: #101613;
  --muted: #57635d;

  --accent: #0e6b4f;
  --accent-deep: #0a5540;
  --accent-wash: #e9f1ec;
  --accent-bright: #4cc796; /* dark backgrounds only */

  --bench: #101614;
  --on-bench: #c4cfc9;
  --on-bench-faint: #8da399;

  --rule: #101613;
  --hairline: #dcdfda;
  --hairline-strong: #c0c7c1;

  --container: 1240px;
  --rail: 9.25rem;
  --header-h: 72px;
}

/* --- Reset / base ----------------------------------------------------------- */

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

html {
  min-width: 320px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--ink);
  background: var(--paper);
  counter-reset: sec fig;
  font-kerning: normal;
  font-optical-sizing: auto;
}

p,
li,
dd {
  text-wrap: pretty;
}

img,
svg {
  max-width: 100%;
  height: auto;
  display: block;
}

p {
  margin: 0 0 1rem;
}

h1,
h2,
h3,
h4 {
  margin: 0 0 1rem;
  color: var(--heading);
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.14;
  letter-spacing: -0.008em;
  text-wrap: balance;
}

h1 {
  font-size: clamp(2.5rem, 5.2vw, 4rem);
  font-weight: 560;
  line-height: 1.06;
  letter-spacing: -0.014em;
}

h1 em,
h2 em {
  font-style: italic;
  font-weight: 540;
  color: inherit;
}

h2 {
  font-size: clamp(1.7rem, 2.8vw, 2.35rem);
  font-weight: 570;
  line-height: 1.1;
}

h3 {
  font-size: 1.3rem;
  font-weight: 620;
  line-height: 1.25;
}

ul,
ol,
dl,
dd,
figure {
  margin: 0;
  padding: 0;
}

a {
  color: var(--accent-deep);
  text-decoration: none;
}

a:hover {
  color: var(--accent);
}

::selection {
  background: var(--accent);
  color: #fff;
}

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

.cta-band :focus-visible,
.site-footer :focus-visible {
  outline-color: #fff;
}

@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;
  }
}

/* Cross-document page transitions (progressive enhancement) */
@media (prefers-reduced-motion: no-preference) {
  @view-transition {
    navigation: auto;
  }
}

/* --- Scroll reveals ---------------------------------------------------------
   Elements are visible by default; main.js adds .reveal only when it will
   also observe and reveal them, so content never stays hidden. */

.js .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.6s ease, transform 0.6s cubic-bezier(0.22, 0.61, 0.36, 1);
  transition-delay: var(--reveal-delay, 0ms);
}

.js .reveal.is-in {
  opacity: 1;
  transform: translateY(0);
}

/* Photography settles into place */
.js .hero-media.reveal,
.js .page-hero-media.reveal,
.js .split-feature > figure.reveal {
  transform: translateY(10px) scale(0.985);
  transition-duration: 0.85s;
}

.js .hero-media.reveal.is-in,
.js .page-hero-media.reveal.is-in,
.js .split-feature > figure.reveal.is-in {
  transform: translateY(0) scale(1);
}

@media (prefers-reduced-motion: reduce) {
  .js .reveal {
    opacity: 1 !important;
    transform: none !important;
  }
}

/* --- Primitives -------------------------------------------------------------- */

.container {
  width: min(100% - 3rem, var(--container));
  margin-inline: auto;
}

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

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 1000;
  transform: translateY(-250%);
  background: var(--bench);
  color: var(--paper);
  padding: 0.7rem 1.1rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: transform 0.15s ease;
}

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

.section {
  padding: clamp(3.5rem, 7vw, 5.75rem) 0;
}

.section-tint {
  background: var(--paper-wash);
}

/* Numbered document sections: mono mark in a left rail, body to the right.
   Numbering comes from a CSS counter, so it always matches document order. */
.sec {
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  column-gap: clamp(1.5rem, 4vw, 4rem);
  border-top: 2px solid var(--rule);
  padding-top: clamp(1.1rem, 2vw, 1.5rem);
}

.sec-mark {
  grid-column: 1;
  margin: 0.3rem 0 1.5rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  line-height: 1.5;
}

.sec-mark::before {
  counter-increment: sec;
  content: counter(sec, decimal-leading-zero);
  display: block;
  margin-bottom: 0.2rem;
  color: var(--accent);
  font-size: 0.95rem;
  letter-spacing: 0.08em;
}

.sec-body {
  grid-column: 2;
  min-width: 0;
}

/* Ruled section without a numbered mark (short documents) */
.sec-plain {
  display: block;
}

.sec-body > :last-child {
  margin-bottom: 0;
}

/* Unnumbered mono label (document meta lines, CTA band) */
.eyebrow,
.doc-meta {
  display: block;
  margin: 0 0 1.1rem;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.eyebrow-light {
  color: var(--accent-bright);
}

.doc-meta {
  color: var(--muted);
}

.lead {
  font-family: var(--font-serif);
  font-size: clamp(1.1rem, 1.5vw, 1.25rem);
  line-height: 1.55;
  color: var(--muted);
  max-width: 56ch;
}

.section-heading {
  max-width: 720px;
  margin-bottom: clamp(1.75rem, 3.5vw, 2.75rem);
}

.section-heading > p:last-child {
  color: var(--muted);
  max-width: 62ch;
  margin-bottom: 0;
}

.section-heading-row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
  max-width: none;
}

.muted {
  color: var(--muted);
}

/* Figures: framed like journal plates, numbered by CSS counter */
.fig-frame img {
  border: 1px solid var(--heading);
}

.fig-caption {
  margin-top: 0.7rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  line-height: 1.6;
  letter-spacing: 0.01em;
}

.fig-caption::before {
  counter-increment: fig;
  content: "Fig. " counter(fig) " — ";
  color: var(--accent);
  font-weight: 500;
}

.fig-caption strong {
  color: var(--heading);
  font-weight: 500;
}

/* Chromatogram traces */
.trace {
  display: block;
  width: 100%;
  color: var(--accent);
}

.hero-trace {
  height: clamp(58px, 9vw, 112px);
}

.trace-axis {
  fill: none;
  stroke: var(--hairline-strong);
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
}

.trace-axis line {
  vector-effect: non-scaling-stroke;
}

.trace-tick {
  fill: var(--muted);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.08em;
}

.trace-line {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
  vector-effect: non-scaling-stroke;
}

@media (prefers-reduced-motion: no-preference) {
  .trace-draw .trace-line {
    stroke-dasharray: 1;
    stroke-dashoffset: 1;
    animation: trace-draw 2.4s cubic-bezier(0.3, 0, 0.2, 1) 0.35s forwards;
  }
}

@keyframes trace-draw {
  to {
    stroke-dashoffset: 0;
  }
}

/* --- Buttons / links ----------------------------------------------------------- */

.button-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1.9rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  min-height: 2.95rem;
  padding: 0.8rem 1.45rem;
  border: 1px solid transparent;
  border-radius: 0;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.btn-primary {
  background: var(--bench);
  color: var(--paper);
}

.btn-primary::after {
  content: "\2192";
  font-family: var(--font-sans);
  font-weight: 450;
  transition: transform 0.18s ease;
}

.btn-primary:hover {
  background: var(--accent-deep);
  color: #fff;
}

.btn-primary:hover::after {
  transform: translateX(4px);
}

.btn-secondary {
  background: transparent;
  border-color: var(--heading);
  color: var(--heading);
}

.btn-secondary:hover {
  border-color: var(--accent-deep);
  background: var(--accent-wash);
  color: var(--accent-deep);
}

.btn-light {
  background: var(--paper);
  color: var(--heading);
}

.btn-light:hover {
  background: #fff;
  color: var(--accent-deep);
}

.btn-ghost-light {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.4);
  color: #fff;
}

.btn-ghost-light:hover {
  border-color: var(--accent-bright);
  color: var(--accent-bright);
}

.btn-sm {
  min-height: 2.5rem;
  padding: 0.5rem 1rem;
  font-size: 0.72rem;
}

.btn-sm::after {
  content: none;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding-block: 0.2rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--accent-deep);
}

.text-link::after {
  content: "\2192";
  font-family: var(--font-sans);
  transition: transform 0.18s ease;
}

.text-link:hover::after {
  transform: translateX(4px);
}

/* --- Header ------------------------------------------------------------------ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--paper);
  border-bottom: 1px solid var(--hairline);
  transition: border-color 0.25s ease;
}

.site-header.is-scrolled {
  border-bottom-color: var(--heading);
}

.header-inner {
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}

.brand-logo {
  inline-size: clamp(8rem, 34vw, 12.5rem);
  max-block-size: 3.3rem;
  object-fit: contain;
  object-position: left center;
}

.site-nav {
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.2rem;
  list-style: none;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 2.6rem;
  padding: 0.5rem 0.8rem;
  color: var(--ink);
  font-size: 0.93rem;
  font-weight: 500;
  transition: color 0.18s ease;
}

.nav-link::after {
  content: "";
  position: absolute;
  inset-inline: 0.8rem;
  bottom: 0.28rem;
  block-size: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.22s cubic-bezier(0.22, 0.61, 0.36, 1);
}

.nav-link:hover {
  color: var(--accent-deep);
}

.nav-link:hover::after {
  transform: scaleX(1);
}

.nav-link.is-active {
  color: var(--heading);
  font-weight: 620;
}

.nav-link.is-active::after {
  transform: scaleX(1);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-toggle {
  display: none;
  border: 1px solid var(--heading);
  background: var(--paper);
  color: var(--heading);
  border-radius: 0;
  min-inline-size: 2.6rem;
  min-block-size: 2.6rem;
  place-items: center;
  cursor: pointer;
}

.nav-toggle-icon,
.nav-toggle-icon::before,
.nav-toggle-icon::after {
  display: block;
  inline-size: 1.15rem;
  block-size: 2px;
  background: currentColor;
}

.nav-toggle-icon {
  position: relative;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle-icon::before {
  top: -0.38rem;
}

.nav-toggle-icon::after {
  top: 0.38rem;
}

/* --- Heroes -------------------------------------------------------------------- */

.home-hero {
  padding: clamp(3.5rem, 7vw, 6rem) 0 0;
  border-bottom: 1px solid var(--hairline);
}

.home-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(300px, 0.92fr);
  gap: clamp(2.5rem, 5.5vw, 5.5rem);
  align-items: stretch;
}

.home-hero-copy .lead {
  margin-bottom: 0.5rem;
}

.hero-media {
  position: relative;
  margin: 0;
  display: flex;
  flex-direction: column;
}

.hero-media > img {
  width: 100%;
  flex: 1 1 auto;
  min-height: 0;
  object-fit: cover;
  border: 1px solid var(--heading);
}

.hero-trace {
  margin-top: clamp(2.5rem, 5vw, 4rem);
}

.page-hero {
  border-bottom: 1px solid var(--hairline);
  padding: clamp(3rem, 6vw, 4.75rem) 0;
}

.page-hero-copy h1 + .lead {
  margin-top: 0.25rem;
}

/* Hero content sits on the same rail grid as the numbered sections */
.page-hero-inner {
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  column-gap: clamp(1.5rem, 4vw, 4rem);
}

.page-hero-copy {
  grid-column: 2;
  max-width: 820px;
}

.page-hero-grid {
  grid-template-columns: var(--rail) minmax(0, 1.05fr) minmax(300px, 0.85fr);
  align-items: center;
  row-gap: 2rem;
}

.page-hero-grid .page-hero-copy {
  max-width: none;
}

.page-hero-media {
  grid-column: 3;
  margin: 0;
}

.page-hero-media img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid var(--heading);
}

.page-hero-narrow {
  max-width: 780px;
}

.page-hero-narrow .lead {
  max-width: 60ch;
}

/* --- Spec strip (capability facts) ------------------------------------------------ */

.section-facts {
  padding: 0;
  border-bottom: 1px solid var(--hairline);
}

.fact-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

.fact {
  padding: clamp(1.4rem, 2.5vw, 2rem) clamp(1rem, 2vw, 1.75rem);
  border-left: 1px solid var(--hairline);
}

.fact:first-child {
  border-left: 0;
  padding-left: 0;
}

.fact strong {
  display: block;
  color: var(--heading);
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 2.6vw, 2.15rem);
  font-weight: 560;
  letter-spacing: -0.01em;
  line-height: 1.15;
}

.fact span {
  display: block;
  margin-top: 0.3rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  line-height: 1.5;
}

/* --- Cards ------------------------------------------------------------------------ */

.card {
  background: var(--paper);
  border: 1px solid var(--hairline-strong);
  padding: clamp(1.5rem, 2.5vw, 2.1rem);
}

.card > :last-child {
  margin-bottom: 0;
}

.card h2 {
  font-size: 1.45rem;
}

.two-column {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.85fr);
  gap: clamp(1.5rem, 3vw, 2.5rem);
  align-items: start;
}

.split-feature {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 0.9fr);
  gap: clamp(2.5rem, 6vw, 5rem);
  align-items: center;
}

.split-feature > figure img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid var(--heading);
}

/* --- Category cards: collapsed-border catalog grid --------------------------------- */

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 258px), 1fr));
}

.category-card {
  display: flex;
  flex-direction: column;
  background: var(--paper);
  border: 1px solid var(--hairline-strong);
  margin: -1px 0 0 -1px;
  transition: background-color 0.18s ease, border-color 0.18s ease;
}

.category-card:hover {
  position: relative;
  z-index: 1;
  border-color: var(--accent);
  background: var(--accent-wash);
}

.category-card-body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 1.5rem 1.55rem 1.55rem;
}

.category-card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  margin-top: auto;
  padding-top: 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-deep);
}

.category-card-link::after {
  content: "\2192";
  font-family: var(--font-sans);
  transition: transform 0.18s ease;
}

.category-card:hover .category-card-link::after {
  transform: translateX(4px);
}

.category-card-kicker {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
  margin: 0 0 0.8rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.category-card-count {
  color: var(--accent-deep);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: none;
  white-space: nowrap;
}

.category-card-body h3 {
  margin-bottom: 0.5rem;
}

.category-card-body h3 a {
  color: var(--heading);
}

.category-card-body h3 a:hover {
  color: var(--accent-deep);
}

.category-card-body p:not(.category-card-kicker) {
  color: var(--muted);
  font-size: 0.93rem;
  margin-bottom: 0;
}

/* --- Metric tiles ------------------------------------------------------------------- */

.metric-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 180px), 1fr));
}

.metric-card {
  background: var(--paper);
  border: 1px solid var(--hairline-strong);
  margin: -1px 0 0 -1px;
  padding: 1.5rem 1.55rem 1.4rem;
}

.metric-card strong {
  display: block;
  color: var(--heading);
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 2.6vw, 2.3rem);
  font-weight: 560;
  letter-spacing: -0.012em;
  line-height: 1.08;
  margin-bottom: 0.45rem;
}

.metric-card span {
  display: block;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  line-height: 1.5;
}

/* --- Value cards (indexed) ----------------------------------------------------------- */

.value-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 225px), 1fr));
}

.value-card {
  background: var(--paper);
  border: 1px solid var(--hairline-strong);
  margin: -1px 0 0 -1px;
  padding: 1.5rem 1.55rem;
}

.value-index {
  display: block;
  margin-bottom: 1.1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--hairline);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.value-card h3 {
  font-size: 1.16rem;
  margin-bottom: 0.4rem;
}

.value-card p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.93rem;
}

/* --- Check list -------------------------------------------------------------------------- */

.check-list {
  display: grid;
  gap: 0.7rem;
  list-style: none;
}

.check-list li {
  position: relative;
  padding-left: 1.9rem;
}

.check-list li::before {
  content: "\2713";
  position: absolute;
  left: 0;
  top: 0.05rem;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 500;
}

.check-list-columns {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
  column-gap: 2rem;
}

/* --- Tables: set like journal tables --------------------------------------------------------- */

.table-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.1rem;
}

.search-field {
  display: block;
  flex: 1 1 300px;
  max-width: 460px;
}

input[type="search"],
input[type="text"],
input[type="email"],
textarea {
  width: 100%;
  min-height: 2.85rem;
  padding: 0.7rem 0.95rem;
  border: 1px solid var(--hairline-strong);
  border-radius: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.88rem;
  transition: border-color 0.15s ease;
}

input[type="search"]:focus-visible,
input[type="text"]:focus-visible,
input[type="email"]:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--accent-deep);
  outline-offset: 0;
  border-color: var(--accent-deep);
}

input::placeholder {
  color: var(--muted);
  opacity: 1;
}

.table-count {
  margin: 0;
  color: var(--accent-deep);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
}

.table-scroll {
  overflow-x: auto;
  overflow-y: auto;
  background: var(--paper);
  border-top: 2px solid var(--rule);
  border-bottom: 2px solid var(--rule);
  max-height: min(72vh, 780px);
}

.data-table {
  width: 100%;
  min-width: 640px;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 0.95rem;
}

.data-table.has-structures {
  min-width: 760px;
}

.data-table thead th {
  position: sticky;
  top: 0;
  z-index: 2;
  background: var(--paper);
  color: var(--muted);
  text-align: left;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.9rem 1.1rem;
  border-bottom: 1px solid var(--heading);
  white-space: nowrap;
}

.data-table tbody td {
  padding: 0.8rem 1.1rem;
  border-bottom: 1px solid var(--hairline);
  vertical-align: middle;
}

.data-table tbody tr:last-child td {
  border-bottom: 0;
}

.data-table tbody tr:hover td {
  background: var(--accent-wash);
}

.data-table tbody tr:hover td:first-child {
  box-shadow: inset 2px 0 var(--accent);
}

.cell-name {
  min-width: 240px;
  font-weight: 500;
  color: var(--heading);
}

.cell-cas {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  white-space: nowrap;
}

.cell-cat a {
  font-weight: 500;
}

.cell-family {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  white-space: nowrap;
}

.cell-structure img {
  max-width: 170px;
  max-height: 130px;
  width: auto;
  object-fit: contain;
  margin-block: 0.2rem;
  padding: 0.3rem;
  border: 1px solid var(--hairline);
  background:
    linear-gradient(var(--hairline) 1px, transparent 1px) 0 0 / 100% 8px,
    linear-gradient(90deg, var(--hairline) 1px, transparent 1px) 0 0 / 8px 100%,
    #fff;
}

.cell-remarks {
  color: var(--muted);
  min-width: 160px;
  font-size: 0.88rem;
}

.cell-none {
  color: var(--hairline-strong);
}

.table-empty {
  margin-top: 1rem;
  padding: 1.1rem 1.25rem;
  border: 1px dashed var(--hairline-strong);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

/* --- Category cross-nav ------------------------------------------------------------------------ */

.crossnav {
  display: grid;
  gap: 1.5rem;
}

.crossnav-group {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.crossnav-label {
  flex-basis: 100%;
  margin: 0 0 0.15rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.crossnav-link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.55rem;
  padding: 0.55rem 1rem;
  border: 1px solid var(--hairline-strong);
  background: var(--paper);
  color: var(--heading);
  font-size: 0.9rem;
  font-weight: 500;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.crossnav-link span {
  color: var(--accent-deep);
  font-family: var(--font-mono);
  font-size: 0.74rem;
}

.crossnav-link:hover {
  border-color: var(--accent);
  background: var(--accent-wash);
  color: var(--accent-deep);
}

.crossnav-link.is-active {
  background: var(--bench);
  border-color: var(--bench);
  color: var(--paper);
}

.crossnav-link.is-active span {
  color: var(--accent-bright);
}

/* --- Gallery -------------------------------------------------------------------------------------- */

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr));
  gap: clamp(1.25rem, 2.5vw, 2rem);
}

.gallery-card {
  margin: 0;
}

.gallery-card img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid var(--heading);
}

.gallery-card figcaption {
  margin-top: 0.65rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.01em;
}

.gallery-card figcaption::before {
  counter-increment: fig;
  content: "Fig. " counter(fig) " — ";
  color: var(--accent);
  font-weight: 500;
}

/* --- Steps (contact) -------------------------------------------------------------------------------- */

.step-list {
  list-style: none;
  counter-reset: step;
  display: grid;
  gap: 0;
  margin-bottom: 1rem;
}

.step-list li {
  counter-increment: step;
  position: relative;
  padding: 1rem 0 1rem 3.2rem;
  border-bottom: 1px solid var(--hairline);
}

.step-list li:first-child {
  border-top: 1px solid var(--hairline);
}

.step-list li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0.15rem;
  top: 1.15rem;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.06em;
}

.step-list strong {
  color: var(--heading);
}

/* --- Contact ---------------------------------------------------------------------------------------------- */

.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 0.9fr);
  gap: clamp(1.5rem, 3vw, 2.5rem);
  align-items: start;
}

.contact-list {
  display: grid;
  gap: 1.1rem;
}

.contact-list > div {
  padding-bottom: 1.1rem;
  border-bottom: 1px solid var(--hairline);
}

.contact-list > div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.contact-list dt {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  margin-bottom: 0.3rem;
}

.contact-list dd {
  color: var(--heading);
  font-weight: 550;
  font-size: 1.05rem;
}

.contact-list dd a {
  color: var(--heading);
}

.contact-list dd a:hover {
  color: var(--accent-deep);
}

/* --- CTA band ------------------------------------------------------------------------------------------------ */

.cta-band {
  background: var(--bench);
  color: var(--on-bench);
  padding: clamp(3.5rem, 7vw, 5.5rem) 0;
}

.cta-band-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) auto;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}

.cta-band h2 {
  color: var(--paper);
}

.cta-band p {
  color: var(--on-bench);
  max-width: 56ch;
  margin-bottom: 0;
}

.cta-band .eyebrow-light {
  color: var(--accent-bright);
}

.cta-band .button-row {
  margin-top: 0;
}

/* --- News ------------------------------------------------------------------------------------------------------ */

.news-card {
  display: grid;
  grid-template-columns: minmax(240px, 340px) minmax(0, 1fr);
  background: var(--paper);
  border: 1px solid var(--hairline-strong);
  overflow: hidden;
}

.news-media img {
  width: 100%;
  height: 100%;
  min-height: 210px;
  object-fit: cover;
}

.news-body {
  padding: clamp(1.3rem, 2.5vw, 2rem);
}

.news-body h2 a {
  color: var(--heading);
}

.news-body h2 a:hover {
  color: var(--accent-deep);
}

.news-date {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  margin-bottom: 0.5rem;
}

.article-body {
  max-width: 720px;
}

.article-body p {
  max-width: 70ch;
}

.article-body img {
  border: 1px solid var(--heading);
  margin: 1.5rem 0;
}

/* --- Error pages: out-of-spec lab report ------------------------------------------------------------------------- */

.error-hero {
  min-height: 55vh;
  display: grid;
  place-items: center;
  padding: clamp(3.5rem, 8vw, 6rem) 0;
}

.error-doc {
  max-width: 620px;
  text-align: left;
}

.error-code {
  display: block;
  color: var(--heading);
  font-family: var(--font-serif);
  font-size: clamp(5rem, 14vw, 8rem);
  font-weight: 560;
  letter-spacing: -0.02em;
  line-height: 1;
  margin-bottom: 1.75rem;
}

.error-report {
  margin-bottom: 1.75rem;
  border-top: 2px solid var(--rule);
  border-bottom: 2px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

.error-row {
  display: grid;
  grid-template-columns: 1.1fr 1fr 1fr;
  gap: 1rem;
  padding: 0.7rem 0;
}

.error-row + .error-row {
  border-top: 1px solid var(--hairline);
}

.error-row-head {
  color: var(--muted);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.error-row span {
  min-width: 0;
}

.error-pass {
  color: var(--accent-deep);
}

.error-flag {
  color: var(--heading);
  font-weight: 500;
}

.error-doc h1 {
  font-size: clamp(1.9rem, 4vw, 2.6rem);
}

.error-doc .button-row {
  justify-content: flex-start;
}

/* --- Footer ------------------------------------------------------------------------------------------------------------ */

.site-footer {
  background: var(--bench);
  color: var(--on-bench);
}

.footer-fig {
  padding-top: clamp(2rem, 4.5vw, 3.25rem);
}

.footer-trace {
  height: clamp(52px, 8vw, 96px);
  color: var(--accent-bright);
}

.footer-trace .trace-line {
  opacity: 0.8;
}

.footer-trace .trace-axis {
  stroke: rgba(196, 207, 201, 0.32);
}

.footer-trace .trace-tick {
  fill: rgba(196, 207, 201, 0.62);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.75fr 0.75fr 1.1fr;
  gap: clamp(2rem, 4vw, 3rem);
  padding-top: clamp(2rem, 4vw, 3rem);
}

.footer-brand {
  color: var(--paper);
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.2rem;
  letter-spacing: 0;
  margin-bottom: 0.75rem;
}

.footer-tagline {
  font-size: 0.93rem;
  max-width: 34ch;
  margin-bottom: 0;
}

.footer-heading {
  color: var(--on-bench-faint);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  margin: 0 0 0.95rem;
}

.footer-list {
  list-style: none;
  display: grid;
  gap: 0.55rem;
  font-size: 0.93rem;
}

.footer-list a {
  display: inline-block;
  padding-block: 0.15rem;
  color: var(--on-bench);
}

.footer-list a:hover {
  color: #fff;
}

.footer-address {
  line-height: 1.55;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: clamp(2.5rem, 5vw, 3.5rem);
  padding-top: 1.4rem;
  padding-bottom: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--on-bench-faint);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.03em;
}

.footer-bottom p {
  margin: 0;
}

/* --- Responsive ------------------------------------------------------------------------------------------------------------ */

@media (max-width: 1080px) {
  .sec {
    grid-template-columns: minmax(0, 1fr);
  }

  .sec-mark,
  .sec-body {
    grid-column: 1;
  }

  .sec-mark {
    display: flex;
    align-items: baseline;
    gap: 0.6rem;
    margin-bottom: 1.25rem;
  }

  .sec-mark::before {
    margin-bottom: 0;
    font-size: 0.78rem;
  }

  .page-hero-inner {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-hero-copy {
    grid-column: 1;
  }

  .page-hero-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(300px, 0.85fr);
  }

  .page-hero-grid .page-hero-media {
    grid-column: 2;
  }
}

@media (max-width: 980px) {
  .nav-toggle {
    display: inline-grid;
  }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    inset-inline: 0;
    z-index: 99;
    background: var(--paper);
    border-bottom: 2px solid var(--heading);
    padding: 0.9rem 1.5rem 1.4rem;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.2s ease, opacity 0.2s ease, visibility 0.2s ease;
  }

  .site-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-list {
    display: grid;
    gap: 0.2rem;
  }

  .nav-link {
    width: 100%;
    min-height: 2.9rem;
    font-size: 1rem;
    border-bottom: 1px solid var(--hairline);
  }

  .nav-link::after {
    inset-inline: 0 auto;
    inline-size: 1.5rem;
    bottom: -1px;
  }

  .home-hero-grid,
  .page-hero-grid,
  .split-feature,
  .two-column,
  .contact-grid,
  .cta-band-inner,
  .news-card {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-hero-media,
  .page-hero-grid .page-hero-media {
    grid-column: 1;
    order: -1;
  }

  .news-media img {
    aspect-ratio: 16 / 9;
    height: auto;
  }

  .page-hero-media img {
    aspect-ratio: 2.1 / 1;
  }

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

@media (max-width: 640px) {
  :root {
    --header-h: 64px;
  }

  .container {
    width: min(100% - 2rem, var(--container));
  }

  .brand-logo {
    max-block-size: 2.9rem;
  }

  .fact-strip {
    grid-template-columns: 1fr 1fr;
    border-top: 1px solid var(--hairline);
  }

  .fact {
    border-left: 0;
    padding-left: 0;
    border-bottom: 1px solid var(--hairline);
  }

  .fact:nth-child(even) {
    border-left: 1px solid var(--hairline);
    padding-left: 1rem;
  }

  .fact:nth-last-child(-n + 1) {
    border-bottom: 0;
  }

  .data-table {
    font-size: 0.9rem;
  }

  .data-table thead th,
  .data-table tbody td {
    padding: 0.7rem 0.85rem;
  }

  .cell-structure img {
    max-width: 130px;
    max-height: 104px;
  }

  .button-row .btn {
    flex: 1 1 auto;
  }

  .btn {
    white-space: normal;
    text-align: center;
    font-size: 0.74rem;
    letter-spacing: 0.07em;
  }

  .error-row {
    gap: 0.6rem;
    font-size: 0.76rem;
  }

  .trace-tick {
    display: none;
  }
}

@media (max-width: 400px) {
  .brand-logo {
    inline-size: clamp(6.5rem, 30vw, 8rem);
  }

  .header-cta {
    padding-inline: 0.7rem;
  }
}