:root {
  --orange: #f47721;
  --white: #f4f3ee;
  --display: "Bahnschrift Condensed", "Arial Narrow", Impact, sans-serif;
  --mono: "Cascadia Mono", Consolas, monospace;
  --body: Inter, "Segoe UI", Arial, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--white); background: #111; font-family: var(--body); }
img { display: block; max-width: 100%; }
a { color: inherit; }
.skip-link { position: fixed; left: 1rem; top: 1rem; z-index: 100; transform: translateY(-180%); padding: .8rem 1rem; color: #111; background: var(--orange); font-weight: 800; }
.skip-link:focus { transform: none; }
.standalone-page { overflow: hidden; }

.eyebrow { grid-area: eyebrow; margin: 0; color: var(--orange); font: 900 .58rem/1 var(--mono); letter-spacing: .18em; }
.concept { position: relative; min-height: 100svh; overflow: hidden; isolation: isolate; }
.concept-bg { position: absolute; z-index: -3; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.concept-cta { display: inline-flex; align-items: center; justify-content: space-between; gap: 2rem; min-width: 13rem; padding: 1rem 1.15rem; color: #111; background: var(--orange); text-decoration: none; font: 900 .56rem/1 var(--mono); letter-spacing: .12em; }

.concept-calibration .concept-bg { object-position: 72% center; }
.calibration-vignette { position: absolute; inset: 0; z-index: -2; background: linear-gradient(90deg, rgba(0,0,0,.68) 0, rgba(0,0,0,.38) 37%, transparent 62%, rgba(0,0,0,.12) 100%), linear-gradient(0deg, rgba(0,0,0,.46), transparent 48%), linear-gradient(180deg, rgba(0,0,0,.22), transparent 20%); }
.calibration-header { position: absolute; z-index: 8; top: 0; left: 0; right: 0; min-height: 5.25rem; padding: 1.1rem clamp(1.5rem, 4vw, 4.5rem); display: flex; align-items: center; justify-content: space-between; gap: 2rem; border-bottom: 1px solid rgba(255,255,255,.14); background: linear-gradient(180deg, rgba(4,6,6,.66), rgba(4,6,6,.18)); }
.calibration-identity { display: grid; gap: .42rem; color: white; text-decoration: none; font: 800 .83rem/1 var(--body); letter-spacing: .18em; }
.calibration-identity b { color: var(--orange); font-weight: 900; }
.calibration-identity small { color: rgba(255,255,255,.52); font: 800 .5rem/1 var(--mono); letter-spacing: .26em; }
.calibration-header nav { align-self: stretch; display: flex; align-items: center; gap: clamp(1.4rem, 3vw, 3.4rem); }
.calibration-header nav a { position: relative; color: rgba(255,255,255,.72); text-decoration: none; text-transform: uppercase; font: 800 .62rem/1 var(--mono); letter-spacing: .18em; }
.calibration-header nav a[aria-current="page"]::after { content: ""; position: absolute; right: 18%; bottom: -.85rem; left: 18%; height: 2px; background: var(--orange); }
.calibration-header nav a:hover, .calibration-header nav a:focus-visible { color: white; }
.calibration-header nav a.nav-icon { display: inline-flex; align-items: center; justify-content: center; width: 2.25rem; height: 2.25rem; padding: 0; }
.calibration-header nav a.nav-icon svg { width: 1.15rem; height: 1.15rem; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
/* Photographic optics stay inside the original lens, beneath the existing vignette. */
.vial-optics { position: absolute; z-index: -3; pointer-events: none; }
.calibration-copy { position: absolute; z-index: 3; left: clamp(1.5rem, 6vw, 6.5rem); top: 31%; width: min(45vw, 42rem); }
.calibration-copy h2, .calibration-copy h1 { margin: .75rem 0 1.2rem; font: 900 clamp(3.7rem, 7.5vw, 9rem)/.8 var(--display); text-transform: uppercase; }
.calibration-copy .eyebrow { width: fit-content; padding: .5rem .7rem; color: rgba(255,255,255,.76); border: 1px solid rgba(255,255,255,.24); background: rgba(6,8,8,.28); }
.calibration-copy h1, .calibration-copy h2 { margin: .85rem 0 1.35rem; font-size: clamp(4.8rem, 8vw, 8.25rem); letter-spacing: -.025em; }
.calibration-copy h1 span, .calibration-copy h1 strong, .calibration-copy h2 span, .calibration-copy h2 strong { display: block; }
.calibration-copy h1 strong, .calibration-copy h2 strong { color: var(--orange); }
.calibration-copy h1::after, .calibration-copy h2::after { content: ""; display: block; width: clamp(5.5rem, 8vw, 8rem); height: 4px; margin-top: 1.25rem; background: var(--orange); }
.calibration-copy .hero-subheading { max-width: 40rem; margin: 0 0 .65rem; color: white; font: 800 clamp(1.05rem, 1.55vw, 1.35rem)/1.25 var(--display); letter-spacing: .01em; text-transform: uppercase; }
.calibration-copy .hero-subheading::after { display: none; }
.calibration-copy .hero-supporting { margin: 0; max-width: 42rem; }
.calibration-copy > p:not(.eyebrow) { color: #bbb; font-size: 19.32px; line-height: 1.45; }
.calibration-copy > p strong { color: white; }
.calibration-copy .concept-cta { min-width: min(22rem, 100%); margin-top: 1.45rem; padding: 1.35rem 1.65rem; font-size: .7rem; box-shadow: 0 12px 36px rgba(0,0,0,.24); }
/* The setup line uses the existing space above the button, without moving it. */
.calibration-action { position: relative; margin-top: clamp(1.6rem, 2vw, 2.15rem); }
.calibration-action .cta-setup { display: block; font: 800 .7rem/1.5 var(--mono); letter-spacing: .06em; }
.calibration-action .concept-cta { margin-top: .65rem; }
.concept-calibration .readout { position: absolute; z-index: 4; right: 3.5%; display: grid; gap: .25rem; min-width: 9.5rem; padding: .55rem .75rem; opacity: .68; border: 0; border-left: 1px solid rgba(244,119,33,.68); background: rgba(5,7,7,.28); backdrop-filter: blur(3px); }
.concept-calibration .readout small { color: rgba(255,255,255,.58); font: 700 .39rem/1 var(--mono); letter-spacing: .14em; }
.concept-calibration .readout strong { font: 500 clamp(.7rem, .82vw, .9rem)/1 var(--mono); }
.concept-calibration .readout i { color: var(--orange); font: 800 .34rem/1 var(--mono); font-style: normal; }
.concept-calibration .readout-hz { top: 22%; left: auto; }
.concept-calibration .readout-va { top: 31%; }
.concept-calibration .readout-sd { top: 40%; bottom: auto; }
.level-status { position: absolute; z-index: 5; left: calc(72vw - 5.2vh); top: 33%; display: grid; gap: .25rem; margin: 0; padding: .55rem .7rem; color: rgba(255,255,255,.72); background: rgba(10,11,10,.76); border: 1px solid rgba(255,255,255,.15); font: 800 .47rem/1 var(--mono); letter-spacing: .12em; }
.level-status strong { display: flex; align-items: center; gap: .45rem; color: var(--orange); font-size: .58rem; }
.level-status strong::before { content: ""; width: .48rem; height: .48rem; flex: none; border-radius: 50%; background: #45d46f; box-shadow: 0 0 0 0 rgba(69,212,111,.62); animation: status-pulse 1.8s ease-out infinite; }
.level-status::after { content: ""; position: absolute; left: 18%; top: 100%; width: 1px; height: clamp(3rem, 8vh, 5rem); background: linear-gradient(var(--orange), rgba(244,119,33,.08)); transform: rotate(55deg); transform-origin: top; }
.micro-status { position: absolute; z-index: 4; right: 3.2%; top: 61%; display: flex; align-items: flex-start; gap: .65rem; margin: 0; color: rgba(255,255,255,.58); font: 700 .48rem/1.45 var(--mono); letter-spacing: .13em; }
.micro-status i { width: 1px; height: 4.2rem; background: linear-gradient(var(--orange), rgba(255,255,255,.18)); animation: pulse 2.4s infinite; }
.calibration-footer { position: absolute; z-index: 6; right: 0; bottom: 0; left: 0; min-height: 4.4rem; display: flex; align-items: center; justify-content: space-between; gap: 2rem; padding: 0 clamp(1.5rem, 4vw, 4.5rem); color: rgba(255,255,255,.52); background: linear-gradient(0deg, rgba(3,4,4,.82), rgba(3,4,4,.38)); border-top: 1px solid rgba(255,255,255,.14); font: 800 .47rem/1 var(--mono); letter-spacing: .16em; }
.calibration-footer span:last-child { color: rgba(255,255,255,.64); }

@keyframes pulse { 50% { transform: scale(.7); opacity: .5; } }
@keyframes status-pulse { 0% { box-shadow: 0 0 0 0 rgba(69,212,111,.62); } 70%, 100% { box-shadow: 0 0 0 .55rem rgba(69,212,111,0); } }

@media (max-width: 760px) {
  .calibration-header { min-height: 4.1rem; padding: .8rem 1.15rem; }
  .calibration-identity { gap: .28rem; font-size: .63rem; letter-spacing: .11em; }
  .calibration-identity small { font-size: .38rem; }
  .calibration-header nav { gap: 0; }
  .calibration-header nav a { display: none; font-size: .48rem; }
  .calibration-header nav a:last-child { display: block; }
  .calibration-header nav a:first-child::after { display: none; }
  .concept-calibration .readout { top: 9.3%; right: auto; min-width: 0; width: 29%; padding: .42rem .35rem; gap: .18rem; background: rgba(5,7,7,.34); }
  .concept-calibration .readout small { font-size: .31rem; letter-spacing: .07em; }
  .concept-calibration .readout strong { overflow: hidden; font-size: .59rem; white-space: nowrap; }
  .concept-calibration .readout i { display: none; }
  .concept-calibration .readout-hz { left: 4%; }
  .concept-calibration .readout-va { left: 35.5%; }
  .concept-calibration .readout-sd { right: 4%; left: auto; display: grid; }
  .calibration-copy { left: 1.4rem; top: 54%; bottom: auto; width: calc(100% - 2.8rem); }
  .calibration-copy h2, .calibration-copy h1 { font-size: clamp(3.1rem, 16vw, 5.5rem); }
  .calibration-copy h1, .calibration-copy h2 { margin: .55rem 0 .85rem; }
  .calibration-copy .hero-subheading { margin: 0 0 .45rem; font-size: .95rem; line-height: 1.2; }
  .calibration-copy > p:not(.eyebrow) { margin: 0; font-size: 1rem; line-height: 1.45; }
  .calibration-copy .concept-cta { min-width: 0; width: min(100%, 18rem); margin-top: 1rem; padding: 1.1rem 1.2rem; font-size: .6rem; }
  .level-status, .micro-status { display: none; }
  .calibration-footer { min-height: 3.4rem; gap: 1rem; padding: 0 1rem; font-size: .31rem; line-height: 1.35; letter-spacing: .08em; }
  .calibration-footer span { width: 47%; }
  .calibration-footer span:last-child { text-align: right; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
}

/* Refinement: readable instrument details and restrained interaction. */
.calibration-header .desktop-navigation a { font-size: .7rem; padding-block: .8rem; }
.calibration-identity small { font-size: .58rem; }
.concept-cta { transition: background-color 180ms ease, box-shadow 180ms ease; }
.concept-cta:hover { background-color: #ff913e; box-shadow: 0 8px 28px rgba(244,119,33,.14); }
.concept-cta span[aria-hidden] { transition: transform 180ms ease; }
.concept-cta:hover span[aria-hidden] { transform: translateX(3px); }
.concept-calibration .readout { opacity: .85; }
.concept-calibration .readout small { font-size: .5rem; line-height: 1.3; }
.concept-calibration .readout strong { font-variant-numeric: tabular-nums; }
.concept-calibration .readout i { font-size: .43rem; line-height: 1.3; }
.level-status { font-size: .55rem; line-height: 1.2; }
.level-status strong { font-size: .65rem; }
.micro-status { color: rgba(255,255,255,.72); font-size: .68rem; line-height: 1.4; }

@media (max-width: 760px) {
  /* Let the copy determine page height, keeping the action clear of the footer. */
  .calibration-page { overflow: auto; }
  .calibration-page .concept-calibration { background: #080a09; padding-bottom: 5rem; }
  .calibration-page .concept-bg { height: 520px; }
  .calibration-page .calibration-vignette { background: linear-gradient(180deg, rgba(0,0,0,.15) 0, transparent 220px, rgba(8,10,9,.7) 360px, #080a09 520px); }
  .calibration-page .calibration-copy { position: relative; top: auto; left: auto; width: auto; margin: 365px 1.4rem 0; }
  .calibration-copy h1, .calibration-copy h2 { font-size: clamp(2.7rem, 14.5vw, 5.5rem); }
  .calibration-copy .eyebrow { font-size: .55rem; line-height: 1.3; }
  .calibration-action { margin-top: 1.5rem; }
  .calibration-action .cta-setup { font-size: .65rem; letter-spacing: .025em; }
  .calibration-action .concept-cta { margin-top: .6rem; width: 100%; font-size: .72rem; min-height: 3.25rem; }
  .concept-calibration .readout { top: 86px; }
  .concept-calibration .readout small { font-size: .43rem; letter-spacing: .025em; }
  .concept-calibration .readout strong { font-size: .66rem; }
  .calibration-identity small { font-size: .5rem; }
}

@media (min-width: 761px) and (max-height: 820px) {
  .calibration-page { overflow: auto; }
  .calibration-page .concept-calibration { min-height: 820px; }
}

/* Only navigation changes on the approved hero. Native details works without JavaScript. */
.mobile-navigation { display: none; }
a:focus-visible, summary:focus-visible { outline: 2px solid var(--orange); outline-offset: 5px; }
@media (max-width: 760px) {
  .calibration-header { gap: 1rem; }
  .calibration-header > .desktop-navigation { display: none; }
  .mobile-navigation { display: block; }
  .mobile-navigation summary { min-height: 2.75rem; display: flex; align-items: center; gap: .65rem; color: #f4f3ee; cursor: pointer; list-style: none; font: 800 .55rem/1 var(--mono); letter-spacing: .1em; }
  .mobile-navigation summary::-webkit-details-marker { display: none; }
  .menu-lines { display: grid; gap: 4px; width: 18px; }
  .menu-lines i { display: block; height: 1px; background: currentColor; }
  .calibration-header .mobile-navigation nav { position: absolute; top: 100%; right: 0; left: 0; display: grid; gap: 0; padding: .75rem 1.15rem; background: #101211; border-bottom: 1px solid rgba(255,255,255,.2); box-shadow: 0 14px 28px rgba(0,0,0,.3); }
  .calibration-header .mobile-navigation nav a { display: flex; align-items: center; min-height: 3.25rem; border-bottom: 1px solid rgba(255,255,255,.1); color: #f4f3ee; font-size: .75rem; }
  .calibration-header .mobile-navigation nav a:last-child { border-bottom: 0; }
  .calibration-header .mobile-navigation nav a::after { display: none; }
  .calibration-header .mobile-navigation nav a[aria-current="page"] { color: var(--orange); }
}