:root {
  --ink: #171713;
  --ink-soft: #36352f;
  --ivory: #f1eee4;
  --paper: #f7f4eb;
  --paper-deep: #e7e2d6;
  --line: rgba(23, 23, 19, 0.2);
  --line-dark: rgba(23, 23, 19, 0.58);
  --verm: #c43b27;
  --verm-dark: #9f2b1d;
  --white: #fffdf7;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --sans: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, -apple-system, sans-serif;
  --display: "STKaiti", "KaiTi", "FangSong", serif;
  --pad: clamp(20px, 4vw, 64px);
  --max: 1520px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 110px;
}

body {
  margin: 0;
  color: var(--ink);
  background-color: var(--ivory);
  background-image: radial-gradient(rgba(23, 23, 19, 0.12) 0.55px, transparent 0.55px);
  background-size: 12px 12px;
  font-family: var(--sans);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

body.menu-open { overflow: hidden; }

a { color: inherit; text-decoration: none; }
button { color: inherit; font: inherit; }
img, svg { display: block; max-width: 100%; }
::selection { color: var(--white); background: var(--verm); }

:focus-visible {
  outline: 2px solid var(--verm);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  z-index: 999;
  top: 12px;
  left: 12px;
  padding: 10px 16px;
  color: var(--white);
  background: var(--ink);
  transform: translateY(-160%);
  transition: transform 180ms ease;
}

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

.signal-bar {
  min-height: 31px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 6px var(--pad);
  color: rgba(255, 253, 247, 0.78);
  background: var(--ink);
  font: 10px/1.4 var(--mono);
  letter-spacing: 0.12em;
}

.signal-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #f15a42;
  box-shadow: 0 0 0 3px rgba(241, 90, 66, 0.13);
}

.signal-divider { width: 18px; height: 1px; background: rgba(255, 255, 255, 0.3); }

.site-header {
  position: sticky;
  z-index: 50;
  top: 0;
  min-height: 82px;
  display: grid;
  grid-template-columns: minmax(220px, 1fr) auto;
  align-items: stretch;
  border-bottom: 1px solid var(--line-dark);
  background: rgba(241, 238, 228, 0.92);
  backdrop-filter: blur(14px);
}

.brand {
  min-width: 0;
  display: inline-flex;
  align-items: center;
  gap: 15px;
  width: max-content;
  padding: 12px var(--pad);
}

.brand-mark {
  position: relative;
  width: 37px;
  height: 37px;
  display: grid;
  place-items: center;
  border: 1px solid var(--ink);
  transform: rotate(45deg);
}

.brand-mark i {
  position: absolute;
  width: 16px;
  height: 1px;
  background: var(--ink);
}

.brand-mark i:nth-child(1) { transform: translateY(-5px); }
.brand-mark i:nth-child(3) { transform: translateY(5px); }

.brand-copy { display: flex; flex-direction: column; line-height: 1.1; }
.brand-copy strong { font-size: 17px; letter-spacing: 0.12em; }
.brand-copy small { margin-top: 7px; color: #5a584f; font-size: 10px; letter-spacing: 0.16em; }

.site-nav { display: flex; align-items: stretch; border-left: 1px solid var(--line); }
.site-nav a {
  min-width: 132px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 22px;
  border-right: 1px solid var(--line);
  font-size: 13px;
  letter-spacing: 0.08em;
  transition: color 180ms ease, background 180ms ease;
}
.site-nav a span { color: var(--verm); font: 9px var(--mono); }
.site-nav a:hover { color: var(--white); background: var(--ink); }

.menu-toggle {
  display: none;
  border: 0;
  border-left: 1px solid var(--line);
  background: transparent;
}

.hero {
  min-height: calc(100svh - 113px);
  display: grid;
  grid-template-columns: 74px minmax(360px, 0.85fr) minmax(500px, 1.15fr);
  grid-template-rows: 1fr auto;
  max-width: var(--max);
  margin: 0 auto;
  border-right: 1px solid var(--line);
  border-left: 1px solid var(--line);
  background: rgba(241, 238, 228, 0.73);
}

.hero-index {
  grid-row: 1 / 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 34px 0;
  border-right: 1px solid var(--line);
  writing-mode: vertical-rl;
  font: 10px var(--mono);
  letter-spacing: 0.16em;
}
.hero-index strong { color: var(--verm); font-size: 18px; }
.hero-index i { flex: 1; width: 1px; background: var(--line); }

.hero-copy {
  align-self: center;
  padding: clamp(72px, 8vw, 130px) clamp(36px, 5vw, 84px);
}

.eyebrow, .section-number {
  margin: 0;
  color: #615e55;
  font: 11px/1.5 var(--mono);
  letter-spacing: 0.12em;
}

.eyebrow { display: flex; align-items: center; gap: 14px; }
.eyebrow span { color: var(--white); background: var(--verm); padding: 5px 8px; }

.hero h1 {
  margin: 34px 0 30px;
  font-size: clamp(52px, 5.7vw, 92px);
  font-weight: 570;
  line-height: 1.02;
  letter-spacing: -0.055em;
}
.hero h1 em { color: var(--verm); font-family: var(--display); font-weight: 500; }
.hero-intro { max-width: 570px; margin: 0; color: #4e4b44; font-size: 16px; line-height: 1.9; }

.hero-actions { display: flex; align-items: center; gap: 30px; margin-top: 44px; }
.button {
  min-height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 30px;
  padding: 13px 18px 13px 22px;
  border: 1px solid var(--ink);
  font-size: 13px;
  letter-spacing: 0.08em;
  transition: color 180ms ease, background 180ms ease, transform 180ms ease;
}
.button:hover { transform: translateY(-2px); }
.button-primary { color: var(--white); background: var(--ink); }
.button-primary:hover { background: var(--verm-dark); border-color: var(--verm-dark); }
.button span { font: 15px var(--mono); }
.text-link {
  display: inline-flex;
  align-items: center;
  gap: 28px;
  padding: 8px 0;
  border-bottom: 1px solid var(--ink);
  font-size: 13px;
}
.text-link span { color: var(--verm); transition: transform 180ms ease; }
.text-link:hover span { transform: translateX(4px); }

.specimen-stage {
  position: relative;
  min-height: 630px;
  align-self: stretch;
  margin: 0;
  overflow: hidden;
  border-left: 1px solid var(--line);
  background-color: var(--paper-deep);
  background-image:
    linear-gradient(rgba(23, 23, 19, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 23, 19, 0.08) 1px, transparent 1px),
    radial-gradient(circle at 65% 40%, rgba(255,255,255,0.7), transparent 36%);
  background-size: 42px 42px, 42px 42px, auto;
}

.specimen-stage::after {
  content: "";
  position: absolute;
  inset: 9% 8%;
  border: 1px solid rgba(23, 23, 19, 0.21);
  pointer-events: none;
}

.stage-coordinate { position: absolute; z-index: 3; color: #6c695f; font: 9px var(--mono); letter-spacing: 0.1em; }
.stage-coordinate-top { top: 5.5%; left: 8%; }
.stage-coordinate-side { right: 3%; bottom: 14%; writing-mode: vertical-rl; }
.stage-orbit {
  position: absolute;
  top: 24%;
  left: 24%;
  width: min(52%, 400px);
  aspect-ratio: 1;
  border: 1px solid rgba(196, 59, 39, 0.36);
  border-radius: 50%;
}
.stage-orbit::before, .stage-orbit::after { content: ""; position: absolute; background: var(--verm); }
.stage-orbit::before { top: 50%; left: -5px; width: 9px; height: 1px; }
.stage-orbit::after { top: -5px; left: 50%; width: 1px; height: 9px; }

.hero-vessel { position: absolute; z-index: 4; top: 13%; left: 39%; width: 174px; height: 450px; }
.vessel-cap {
  width: 108px;
  height: 81px;
  margin: 0 auto;
  border: 1px solid #26251f;
  border-radius: 11px 11px 4px 4px;
  background: linear-gradient(90deg, #1b1b18, #48473f 48%, #171713);
  box-shadow: inset 12px 0 18px rgba(255,255,255,0.08), 10px 14px 24px rgba(23,23,19,0.13);
}
.vessel-cap span { display: block; width: 20px; height: 51px; margin: -45px auto 0; border-radius: 10px 10px 0 0; background: #24241f; }
.vessel-neck { width: 70px; height: 43px; margin: 0 auto -6px; border: 1px solid rgba(23,23,19,0.6); background: rgba(250,248,240,0.65); }
.vessel-body {
  position: relative;
  width: 174px;
  height: 297px;
  overflow: hidden;
  border: 1px solid rgba(23,23,19,0.68);
  border-radius: 12px 12px 22px 22px;
  background: linear-gradient(90deg, rgba(255,255,255,0.55), rgba(255,255,255,0.16) 28%, rgba(255,255,255,0.05) 70%, rgba(255,255,255,0.48));
  box-shadow: inset 12px 0 20px rgba(255,255,255,0.45), 20px 30px 40px rgba(23,23,19,0.16);
  backdrop-filter: blur(3px);
}
.vessel-liquid { position: absolute; inset: 36% 5px 5px; border-radius: 2px 2px 17px 17px; background: linear-gradient(rgba(196,59,39,0.26), rgba(158,64,43,0.52)); }
.vessel-scale { position: absolute; z-index: 2; right: 12px; width: 20px; height: 1px; background: rgba(23,23,19,0.4); }
.scale-one { top: 31%; }.scale-two { top: 42%; width: 13px; }.scale-three { top: 53%; }
.vessel-label {
  position: absolute;
  z-index: 3;
  left: 21px;
  bottom: 35px;
  width: 130px;
  padding: 15px 12px 13px;
  border: 1px solid rgba(23,23,19,0.72);
  background: rgba(242,239,229,0.86);
  line-height: 1.3;
}
.vessel-label b, .vessel-label i, .vessel-label small { display: block; font-style: normal; }
.vessel-label b { margin-bottom: 14px; color: var(--verm); font: 9px var(--mono); }
.vessel-label i { font-size: 13px; font-weight: 700; }
.vessel-label small { margin-top: 5px; color: #656158; font: 8px var(--mono); }

.data-note { position: absolute; z-index: 6; min-width: 140px; padding: 14px; border: 1px solid rgba(23,23,19,0.4); background: rgba(247,244,235,0.88); backdrop-filter: blur(6px); }
.data-note span, .data-note small, .data-note strong { display: block; }
.data-note span { color: #69665d; font: 9px var(--mono); }
.data-note strong { margin: 6px 0 3px; font: 26px var(--mono); }
.data-note small { color: #5e5b53; font-size: 9px; }
.data-note-a { top: 24%; left: 8%; }
.data-note-b { right: 7%; bottom: 23%; min-width: 112px; }
.data-note-b strong { color: var(--verm); }
.stage-shadow { position: absolute; z-index: 2; left: 30%; bottom: 12%; width: 47%; height: 55px; border-radius: 50%; background: rgba(23,23,19,0.2); filter: blur(18px); transform: skewX(-18deg); }

.specimen-stage figcaption {
  position: absolute;
  z-index: 5;
  right: 8%;
  bottom: 6%;
  left: 8%;
  display: flex;
  justify-content: space-between;
  padding-top: 10px;
  border-top: 1px solid rgba(23,23,19,0.45);
  font: 9px var(--mono);
  letter-spacing: 0.08em;
}

.hero-footnote {
  grid-column: 2 / 3;
  display: flex;
  gap: 0;
  border-top: 1px solid var(--line);
  font: 10px var(--mono);
  letter-spacing: 0.14em;
}
.hero-footnote span { flex: 1; padding: 16px 12px; border-right: 1px solid var(--line); text-align: center; }

.section-shell { max-width: var(--max); margin: 0 auto; padding: clamp(100px, 11vw, 170px) var(--pad); }
.section-heading { display: grid; grid-template-columns: minmax(200px, 0.42fr) 1fr; gap: 60px; align-items: start; }
.section-heading h2, .method-intro h2, .principles-content h2, .questions-side h2 {
  margin: 0;
  font-size: clamp(39px, 4.6vw, 68px);
  font-weight: 560;
  line-height: 1.13;
  letter-spacing: -0.045em;
}
.section-heading > div { display: flex; align-items: end; justify-content: space-between; gap: 40px; }
.section-heading > div p { max-width: 410px; margin: 0 0 8px; color: #5c5951; font-size: 14px; }

.sample-toolbar { display: flex; justify-content: space-between; align-items: end; gap: 30px; margin-top: 66px; border-bottom: 1px solid var(--ink); }
.filter-group { display: flex; flex-wrap: wrap; gap: 0; }
.filter-button {
  position: relative;
  min-width: 105px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 13px 16px;
  border: 0;
  border-left: 1px solid var(--line);
  background: transparent;
  cursor: pointer;
  font-size: 12px;
}
.filter-button span { color: #747168; font: 9px var(--mono); }
.filter-button::after { content: ""; position: absolute; right: 0; bottom: -1px; left: 0; height: 3px; background: var(--verm); transform: scaleX(0); transition: transform 180ms ease; }
.filter-button.is-active { color: var(--white); background: var(--ink); }
.filter-button.is-active span { color: rgba(255,255,255,0.65); }
.filter-button.is-active::after { transform: scaleX(1); }
.filter-status { margin: 0 0 12px; color: #646158; font: 10px var(--mono); }

.sample-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 1px; margin-top: 28px; background: var(--ink); border: 1px solid var(--ink); }
.sample-card { grid-column: span 4; min-width: 0; background: var(--ivory); }
.sample-card[hidden] { display: none; }
.sample-card-topline { display: flex; justify-content: space-between; gap: 12px; padding: 11px 14px; border-bottom: 1px solid var(--ink); color: #625f56; font: 9px var(--mono); }

.sample-visual { position: relative; min-height: 410px; overflow: hidden; border-bottom: 1px solid var(--ink); background-color: var(--paper-deep); background-image: radial-gradient(rgba(23,23,19,0.18) 0.6px, transparent 0.6px); background-size: 10px 10px; }
.visual-code { position: absolute; top: 18px; left: 18px; z-index: 3; color: var(--verm); font: 10px var(--mono); letter-spacing: 0.12em; }
.measure-caption { position: absolute; right: 18px; bottom: 16px; z-index: 5; padding: 4px 7px; color: var(--white); background: var(--ink); font: 8px var(--mono); }
.measure-line { position: absolute; z-index: 4; height: 1px; background: rgba(23,23,19,0.45); }
.measure-line::before { content: ""; position: absolute; top: -3px; width: 7px; height: 7px; border-radius: 50%; background: var(--verm); }

.dropper { position: absolute; top: 58px; left: 50%; width: 142px; height: 309px; transform: translateX(-50%); }
.dropper i { position: absolute; display: block; }
.dropper-top { top: 0; left: 40px; width: 62px; height: 75px; border-radius: 25px 25px 5px 5px; background: linear-gradient(90deg, #191915, #55534a 52%, #191915); box-shadow: 13px 17px 24px rgba(23,23,19,0.18); }
.dropper-neck { top: 69px; left: 51px; width: 40px; height: 35px; border: 1px solid #44433c; background: rgba(255,255,255,0.54); }
.dropper-bottle { top: 98px; left: 11px; width: 120px; height: 200px; border: 1px solid rgba(23,23,19,0.7); border-radius: 10px 10px 18px 18px; background: linear-gradient(90deg, rgba(255,255,255,0.55), rgba(255,255,255,0.1), rgba(255,255,255,0.48)); box-shadow: inset 10px 0 20px rgba(255,255,255,0.5), 22px 28px 27px rgba(23,23,19,0.16); }
.dropper-level { top: 185px; left: 16px; width: 110px; height: 108px; border-radius: 0 0 15px 15px; background: rgba(196,59,39,0.42); }
.skin-visual .line-a { top: 35%; right: 0; width: 28%; }.skin-visual .line-a::before { left: 0; }
.skin-visual .line-b { bottom: 23%; left: 0; width: 30%; }.skin-visual .line-b::before { right: 0; }

.perfume { position: absolute; z-index: 3; top: 95px; left: 50%; width: 190px; height: 245px; transform: translateX(-50%); }
.perfume i { position: absolute; display: block; }
.perfume-cap { z-index: 2; top: 0; left: 68px; width: 54px; height: 66px; border: 1px solid #171713; background: linear-gradient(90deg, #262520, #57554b, #262520); }
.perfume-neck { top: 58px; left: 77px; width: 36px; height: 29px; border: 1px solid #171713; background: rgba(255,255,255,0.5); }
.perfume-body { top: 81px; left: 0; width: 190px; height: 159px; border: 1px solid rgba(23,23,19,0.8); border-radius: 3px 3px 15px 15px; background: linear-gradient(90deg, rgba(255,255,255,0.55), rgba(159,78,49,0.28) 45%, rgba(255,255,255,0.45)); box-shadow: inset 17px 0 22px rgba(255,255,255,0.45), 28px 28px 30px rgba(23,23,19,0.16); }
.perfume-glow { top: 100px; left: 20px; width: 150px; height: 119px; border-radius: 0 0 10px 10px; background: linear-gradient(rgba(196,59,39,0.08), rgba(139,68,45,0.42)); }
.scent-ring { position: absolute; border: 1px solid rgba(196,59,39,0.42); border-radius: 50%; }
.ring-one { top: 49px; left: 18%; width: 64%; aspect-ratio: 1; }.ring-two { top: 95px; left: 27%; width: 46%; aspect-ratio: 1; }

.nutrition-visual { background-color: #ded9cb; }
.dish { position: absolute; left: 50%; top: 50%; border-radius: 50%; transform: translate(-50%, -50%); }
.dish-outer { width: 285px; height: 285px; border: 1px solid rgba(23,23,19,0.6); background: rgba(246,243,234,0.75); box-shadow: 25px 28px 30px rgba(23,23,19,0.14); }
.dish-inner { width: 210px; height: 210px; border: 1px solid rgba(23,23,19,0.3); background-image: radial-gradient(rgba(23,23,19,0.16) 0.55px, transparent 0.55px); background-size: 8px 8px; }
.capsules { position: absolute; z-index: 4; top: 50%; left: 50%; width: 210px; height: 180px; transform: translate(-50%, -50%); }
.capsules i { position: absolute; width: 52px; height: 116px; border: 1px solid var(--ink); border-radius: 28px; background: linear-gradient(to bottom, var(--verm) 0 50%, #f2eee3 50%); box-shadow: 12px 15px 20px rgba(23,23,19,0.17); }
.capsules i::after { content: ""; position: absolute; top: 50%; left: 0; width: 100%; height: 1px; background: var(--ink); }
.capsules i:nth-child(1) { top: 31px; left: 17px; transform: rotate(-33deg); }
.capsules i:nth-child(2) { top: 23px; left: 82px; transform: rotate(17deg); }
.capsules i:nth-child(3) { top: 48px; right: 7px; transform: rotate(48deg); }

.sample-info { padding: 28px 27px 30px; }
.sample-id { display: flex; align-items: center; justify-content: space-between; gap: 15px; }
.sample-id span { color: #68655c; font: 9px var(--mono); }
.sample-id strong { color: var(--verm); font: 12px var(--mono); }
.sample-info h3 { margin: 26px 0 12px; font-size: 27px; font-weight: 570; letter-spacing: -0.03em; }
.sample-info > p { min-height: 77px; margin: 0; color: #57544d; font-size: 13px; line-height: 1.8; }
.sample-metrics { display: grid; grid-template-columns: repeat(3, 1fr); margin: 26px 0 28px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.sample-metrics div { min-width: 0; padding: 12px 8px 12px 0; border-right: 1px solid var(--line); }
.sample-metrics div + div { padding-left: 10px; }
.sample-metrics div:last-child { border-right: 0; }
.sample-metrics dt { overflow: hidden; color: #747067; font: 8px var(--mono); text-overflow: ellipsis; white-space: nowrap; }
.sample-metrics dd { margin: 7px 0 0; font-size: 11px; font-weight: 700; }
.sample-open { width: 100%; display: flex; justify-content: space-between; align-items: center; padding: 12px 0; border: 0; border-bottom: 1px solid var(--ink); background: transparent; cursor: pointer; font-size: 12px; text-align: left; }
.sample-open span { color: var(--verm); font: 14px var(--mono); transition: transform 180ms ease; }
.sample-open:hover span { transform: translate(3px, -3px); }
.nutrition-note { margin: 18px 0 0; color: #6d695f; font-size: 11px; text-align: right; }

.data-ribbon { display: grid; grid-template-columns: 0.55fr 1.45fr; color: var(--white); background: var(--ink); }
.data-ribbon-title { display: flex; flex-direction: column; justify-content: space-between; min-height: 220px; padding: 35px var(--pad); border-right: 1px solid rgba(255,255,255,0.18); }
.data-ribbon-title span { color: rgba(255,255,255,0.55); font: 9px var(--mono); }
.data-ribbon-title strong { font-size: 28px; font-weight: 500; }
.data-ribbon dl { display: grid; grid-template-columns: repeat(4, 1fr); margin: 0; }
.data-ribbon dl > div { display: flex; flex-direction: column; justify-content: space-between; min-width: 0; padding: 34px 24px; border-right: 1px solid rgba(255,255,255,0.18); }
.data-ribbon dt { color: rgba(255,255,255,0.56); font: 9px var(--mono); }
.data-ribbon dd { display: flex; align-items: baseline; gap: 6px; margin: 0; }
.data-ribbon dd strong { font: clamp(30px, 3.5vw, 53px) var(--mono); font-weight: 400; letter-spacing: -0.05em; }
.data-ribbon dd span { color: #f06a54; font-size: 10px; }

.method-section { display: grid; grid-template-columns: minmax(300px, 0.7fr) minmax(500px, 1.3fr); gap: clamp(70px, 10vw, 160px); }
.method-intro { position: sticky; top: 130px; align-self: start; }
.method-intro h2 { margin-top: 34px; }
.method-intro > p:not(.section-number) { max-width: 470px; margin: 30px 0 34px; color: #57544d; font-size: 14px; line-height: 1.9; }
.method-list { margin: 0; padding: 0; border-top: 1px solid var(--ink); list-style: none; }
.method-list li { display: grid; grid-template-columns: 42px 72px 1fr auto; gap: 24px; align-items: center; min-height: 177px; padding: 25px 0; border-bottom: 1px solid var(--ink); }
.method-no { align-self: start; color: var(--verm); font: 10px var(--mono); }
.method-icon { position: relative; width: 66px; height: 66px; display: grid; place-items: center; border: 1px solid var(--line-dark); border-radius: 50%; }
.method-icon::before, .method-icon::after { content: ""; position: absolute; background: var(--line-dark); }
.method-icon::before { width: 76px; height: 1px; }.method-icon::after { width: 1px; height: 76px; }
.method-icon i { position: relative; z-index: 2; display: block; }
.icon-scan { width: 21px; height: 29px; border: 1px solid var(--ink); background: var(--ivory); }
.icon-scan::after { content: ""; position: absolute; top: 7px; right: 4px; left: 4px; height: 1px; background: var(--verm); box-shadow: 0 5px var(--verm), 0 10px var(--verm); }
.icon-observe { width: 33px; height: 20px; border: 1px solid var(--ink); border-radius: 50%; background: var(--ivory); }
.icon-observe::after { content: ""; position: absolute; top: 5px; left: 12px; width: 7px; height: 7px; border-radius: 50%; background: var(--verm); }
.icon-verify { width: 28px; height: 28px; border: 1px solid var(--ink); border-radius: 50%; background: var(--ivory); }
.icon-verify::after { content: ""; position: absolute; top: 6px; left: 8px; width: 10px; height: 6px; border-bottom: 2px solid var(--verm); border-left: 2px solid var(--verm); transform: rotate(-45deg); }
.icon-file { width: 24px; height: 31px; border: 1px solid var(--ink); background: var(--ivory); }
.icon-file::after { content: ""; position: absolute; right: 4px; bottom: 7px; left: 4px; height: 1px; background: var(--verm); box-shadow: 0 -5px var(--verm); }
.method-list h3 { margin: 0 0 9px; font-size: 22px; font-weight: 560; }
.method-list p { max-width: 440px; margin: 0; color: #5b584f; font-size: 12px; }
.method-list small { align-self: start; color: #77736a; font: 8px var(--mono); writing-mode: vertical-rl; }

.principles-section { display: grid; grid-template-columns: minmax(360px, 0.72fr) minmax(600px, 1.28fr); min-height: 720px; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); background: var(--paper-deep); }
.principles-graphic { position: relative; min-height: 720px; overflow: hidden; border-right: 1px solid var(--ink); background-image: linear-gradient(rgba(23,23,19,0.08) 1px, transparent 1px), linear-gradient(90deg, rgba(23,23,19,0.08) 1px, transparent 1px); background-size: 42px 42px; }
.principles-graphic strong { position: absolute; right: 7%; bottom: 3%; color: rgba(23,23,19,0.08); font: 240px/1 var(--mono); }
.graphic-circle { position: absolute; border: 1px solid rgba(23,23,19,0.5); border-radius: 50%; }
.circle-a { top: 17%; left: 13%; width: 64%; aspect-ratio: 1; }
.circle-b { top: 30%; left: 26%; width: 38%; aspect-ratio: 1; border-color: var(--verm); }
.graphic-axis { position: absolute; background: rgba(23,23,19,0.45); }
.axis-x { top: 47%; left: 7%; width: 86%; height: 1px; }.axis-y { top: 8%; left: 46%; width: 1px; height: 78%; }
.graphic-point { position: absolute; z-index: 2; width: 9px; height: 9px; border: 2px solid var(--paper-deep); border-radius: 50%; background: var(--verm); box-shadow: 0 0 0 1px var(--verm); }
.point-a { top: 47%; left: 13%; }.point-b { top: 30%; left: 46%; }.point-c { top: 66%; left: 68%; }
.principles-content { align-self: center; padding: clamp(70px, 9vw, 145px) var(--pad); }
.principles-content h2 { max-width: 720px; margin-top: 30px; }
.principles-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; margin-top: 66px; border-top: 1px solid var(--ink); }
.principles-grid article { padding: 26px 24px 5px 0; border-right: 1px solid var(--line-dark); }
.principles-grid article + article { padding-left: 24px; }
.principles-grid article:last-child { border-right: 0; }
.principles-grid article > span { color: var(--verm); font: 11px var(--mono); }
.principles-grid h3 { margin: 25px 0 13px; font-size: 17px; }
.principles-grid p { margin: 0; color: #5d5a51; font-size: 12px; line-height: 1.8; }

.questions-section { display: grid; grid-template-columns: 0.68fr 1.32fr; gap: clamp(70px, 10vw, 160px); }
.questions-side h2 { margin: 30px 0 28px; }
.questions-side > p:last-child { max-width: 330px; color: #5b584f; font-size: 13px; }
.accordion { border-top: 1px solid var(--ink); }
.accordion details { border-bottom: 1px solid var(--ink); }
.accordion summary { min-height: 84px; display: grid; grid-template-columns: 42px 1fr 26px; align-items: center; gap: 18px; padding: 12px 0; cursor: pointer; font-size: 16px; font-weight: 650; list-style: none; }
.accordion summary::-webkit-details-marker { display: none; }
.accordion summary > span { color: var(--verm); font: 10px var(--mono); }
.accordion summary i { position: relative; width: 20px; height: 20px; }
.accordion summary i::before, .accordion summary i::after { content: ""; position: absolute; top: 9px; left: 3px; width: 14px; height: 1px; background: var(--ink); transition: transform 180ms ease; }
.accordion summary i::after { transform: rotate(90deg); }
.accordion details[open] summary i::after { transform: rotate(0); }
.accordion details > div { padding: 0 50px 28px 60px; }
.accordion details p { max-width: 680px; margin: 0; color: #5b584f; font-size: 13px; line-height: 1.9; }

.closing-section { position: relative; min-height: 650px; overflow: hidden; padding: clamp(90px, 10vw, 150px) var(--pad); color: var(--white); background: var(--ink); }
.closing-section::before { content: ""; position: absolute; width: min(48vw, 700px); aspect-ratio: 1; top: 50%; right: -8%; border: 1px solid rgba(255,255,255,0.22); border-radius: 50%; transform: translateY(-50%); box-shadow: 0 0 0 70px rgba(255,255,255,0.018), 0 0 0 140px rgba(255,255,255,0.018); }
.closing-label { position: relative; z-index: 2; margin: 0; color: #ef6954; font: 10px var(--mono); letter-spacing: 0.12em; }
.closing-section h2 { position: relative; z-index: 2; max-width: 950px; margin: 45px 0 28px; font-size: clamp(48px, 7vw, 100px); font-weight: 520; line-height: 1.07; letter-spacing: -0.055em; }
.closing-section h2 em { color: #f06a54; font-family: var(--display); font-weight: 400; }
.closing-section > p:not(.closing-label) { position: relative; z-index: 2; max-width: 570px; margin: 0; color: rgba(255,255,255,0.62); font-size: 14px; }
.closing-links { position: relative; z-index: 2; display: flex; align-items: center; gap: 32px; margin-top: 50px; }
.button-light { color: var(--ink); border-color: var(--white); background: var(--white); }
.button-light:hover { color: var(--white); border-color: var(--verm); background: var(--verm); }
.closing-text-link { display: inline-flex; gap: 25px; padding: 9px 0; border-bottom: 1px solid rgba(255,255,255,0.55); font-size: 12px; }
.closing-text-link span { color: #f06a54; }
.closing-code { position: absolute; right: var(--pad); bottom: 35px; color: rgba(255,255,255,0.28); font: 10px var(--mono); letter-spacing: 0.16em; }

.sample-dialog { width: min(900px, calc(100% - 40px)); max-height: calc(100svh - 40px); padding: 0; border: 1px solid var(--ink); color: var(--ink); background: var(--ivory); box-shadow: 0 24px 80px rgba(0,0,0,0.34); }
.sample-dialog::backdrop { background: rgba(18,18,15,0.76); backdrop-filter: blur(5px); }
.dialog-grid { display: grid; grid-template-columns: 220px 1fr; }
.dialog-header { position: sticky; z-index: 4; top: 0; grid-column: 1 / -1; min-height: 64px; display: flex; align-items: center; justify-content: space-between; padding: 0 20px; border-bottom: 1px solid var(--ink); background: var(--ivory); }
.dialog-header p { margin: 0; font: 10px var(--mono); letter-spacing: 0.12em; }
.dialog-close { width: 42px; height: 42px; display: grid; place-items: center; border: 1px solid var(--line-dark); background: transparent; cursor: pointer; }
.dialog-close span, .dialog-close span::after { display: block; width: 17px; height: 1px; background: var(--ink); transform: rotate(45deg); }
.dialog-close span::after { content: ""; transform: rotate(90deg); }
.dialog-close:hover { color: var(--white); background: var(--verm); }
.dialog-close:hover span, .dialog-close:hover span::after { background: var(--white); }
.dialog-identity { min-height: 500px; display: flex; flex-direction: column; padding: 28px 22px; border-right: 1px solid var(--ink); background-color: var(--paper-deep); background-image: radial-gradient(rgba(23,23,19,0.18) .55px, transparent .55px); background-size: 10px 10px; }
.dialog-identity span { color: #69665d; font: 9px var(--mono); }
.dialog-identity strong { margin: auto 0; color: var(--verm); font: 56px var(--mono); letter-spacing: -0.08em; writing-mode: vertical-rl; transform: rotate(180deg); }
.dialog-identity small { font: 8px var(--mono); }
.dialog-content { padding: 45px 48px; }
.dialog-status { margin: 0; color: var(--verm); font: 9px var(--mono); }
.dialog-content h2 { margin: 24px 0 12px; font-size: 40px; line-height: 1.2; letter-spacing: -0.04em; }
.dialog-summary { max-width: 520px; margin: 0; color: #5b584f; font-size: 13px; }
.dialog-content dl { display: grid; grid-template-columns: repeat(3, 1fr); margin: 38px 0; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); }
.dialog-content dl div { padding: 15px 10px 15px 0; border-right: 1px solid var(--line); }
.dialog-content dl div + div { padding-left: 12px; }.dialog-content dl div:last-child { border-right: 0; }
.dialog-content dt { color: #6b685f; font: 8px var(--mono); }.dialog-content dd { margin: 8px 0 0; font-size: 12px; font-weight: 700; }
.dialog-observation { padding: 22px; border-left: 3px solid var(--verm); background: var(--paper-deep); }
.dialog-observation span { color: #666259; font: 9px var(--mono); }
.dialog-observation p { margin: 13px 0 0; color: #4f4c45; font-size: 12px; line-height: 1.8; }

.reveal { opacity: 1; transform: none; }
.has-js .reveal { opacity: 0; transform: translateY(22px); transition: opacity 700ms cubic-bezier(.22,.61,.36,1), transform 700ms cubic-bezier(.22,.61,.36,1); }
.has-js .reveal.is-visible { opacity: 1; transform: none; }

@media (max-width: 1180px) {
  .site-nav a { min-width: 112px; padding: 0 14px; }
  .hero { grid-template-columns: 56px 0.85fr 1.15fr; }
  .hero-copy { padding-right: 40px; padding-left: 40px; }
  .hero-vessel { left: 36%; }
  .data-note-b { right: 4%; }
  .sample-grid { gap: 16px; border: 0; background: transparent; }
  .sample-card { grid-column: span 6; border: 1px solid var(--ink); }
  .sample-card:last-child { grid-column: 4 / span 6; }
  .data-ribbon { grid-template-columns: 0.35fr 1.65fr; }
  .data-ribbon-title { padding-right: 25px; padding-left: 25px; }
  .method-section { gap: 70px; }
  .principles-section { grid-template-columns: 0.55fr 1.45fr; }
}

@media (max-width: 900px) {
  html { scroll-padding-top: 80px; }
  .site-header { min-height: 72px; grid-template-columns: 1fr 76px; }
  .brand { padding-top: 10px; padding-bottom: 10px; }
  .brand-mark { width: 32px; height: 32px; }
  .menu-toggle { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 7px; cursor: pointer; }
  .menu-toggle-text { font: 9px var(--mono); }
  .menu-lines { position: relative; width: 24px; height: 8px; }
  .menu-lines i { position: absolute; left: 0; width: 24px; height: 1px; background: var(--ink); transition: transform 180ms ease, top 180ms ease; }
  .menu-lines i:first-child { top: 0; }.menu-lines i:last-child { top: 7px; }
  .menu-toggle[aria-expanded="true"] .menu-lines i:first-child { top: 3px; transform: rotate(45deg); }
  .menu-toggle[aria-expanded="true"] .menu-lines i:last-child { top: 3px; transform: rotate(-45deg); }
  .site-nav { position: fixed; top: 72px; right: 0; bottom: 0; left: 0; display: none; flex-direction: column; align-items: stretch; overflow-y: auto; border: 0; background: var(--ivory); }
  .site-nav.is-open { display: flex; }
  .site-nav a { flex: 1; justify-content: flex-start; min-height: 78px; padding: 20px var(--pad); border-right: 0; border-bottom: 1px solid var(--ink); font-size: clamp(20px, 5vw, 32px); }
  .site-nav a span { width: 30px; }

  .hero { min-height: auto; grid-template-columns: 45px 1fr; grid-template-rows: auto auto auto; }
  .hero-index { grid-row: 1 / 4; }
  .hero-copy { grid-column: 2; padding: 82px var(--pad) 70px; }
  .hero h1 { font-size: clamp(52px, 12vw, 84px); }
  .specimen-stage { grid-column: 2; min-height: 620px; border-top: 1px solid var(--line); border-left: 0; }
  .hero-footnote { grid-column: 2; }
  .section-heading { grid-template-columns: 1fr; gap: 30px; }
  .section-heading > div { align-items: start; flex-direction: column; }
  .section-heading > div p { margin: 0; }
  .sample-grid { grid-template-columns: repeat(2, 1fr); }
  .sample-card, .sample-card:last-child { grid-column: span 1; }
  .sample-card:last-child { grid-column: 1 / -1; width: 50%; justify-self: center; }
  .data-ribbon { grid-template-columns: 1fr; }
  .data-ribbon-title { min-height: auto; flex-direction: row; padding: 22px var(--pad); border-right: 0; border-bottom: 1px solid rgba(255,255,255,0.18); }
  .method-section { grid-template-columns: 1fr; }
  .method-intro { position: static; }
  .principles-section { grid-template-columns: 1fr; }
  .principles-graphic { min-height: 480px; border-right: 0; border-bottom: 1px solid var(--ink); }
  .principles-graphic strong { font-size: 180px; }
  .questions-section { grid-template-columns: 1fr; gap: 60px; }
}

@media (max-width: 680px) {
  :root { --pad: 20px; }
  .signal-bar { justify-content: flex-start; min-height: 29px; padding-left: 14px; }
  .site-header { min-height: 68px; grid-template-columns: 1fr 68px; }
  .brand-copy small { display: none; }
  .brand { gap: 12px; }
  .site-nav { top: 68px; }
  .hero { grid-template-columns: 33px 1fr; border: 0; }
  .hero-index { gap: 10px; padding: 23px 0; }
  .hero-copy { padding-top: 64px; padding-bottom: 58px; }
  .eyebrow { flex-wrap: wrap; }
  .hero h1 { margin-top: 28px; font-size: clamp(48px, 15vw, 68px); }
  .hero-intro { font-size: 14px; }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 18px; margin-top: 35px; }
  .specimen-stage { min-height: 535px; }
  .hero-vessel { top: 14%; left: 44%; width: 132px; height: 380px; }
  .vessel-cap { width: 85px; height: 65px; }
  .vessel-cap span { width: 16px; height: 42px; margin-top: -37px; }
  .vessel-neck { width: 55px; height: 34px; }
  .vessel-body { width: 132px; height: 250px; }
  .vessel-label { left: 15px; bottom: 27px; width: 102px; padding: 11px 9px; }
  .vessel-label b { margin-bottom: 9px; }
  .data-note { min-width: 105px; padding: 10px; }
  .data-note strong { font-size: 20px; }
  .data-note-a { top: 18%; left: 5%; }
  .data-note-b { right: 4%; bottom: 21%; }
  .stage-orbit { top: 27%; left: 15%; width: 70%; }
  .section-shell { padding-top: 88px; padding-bottom: 88px; }
  .section-heading h2, .method-intro h2, .principles-content h2, .questions-side h2 { font-size: 39px; }
  .sample-toolbar { align-items: flex-start; flex-direction: column; gap: 15px; margin-top: 46px; border-bottom: 0; }
  .filter-group { width: 100%; display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); }
  .filter-button { min-width: 0; border-bottom: 1px solid var(--line); }
  .filter-status { margin: 0; }
  .sample-grid { grid-template-columns: 1fr; gap: 20px; margin-top: 20px; }
  .sample-card, .sample-card:last-child { grid-column: 1; width: 100%; }
  .sample-visual { min-height: 365px; }
  .sample-info h3 { font-size: 25px; }
  .nutrition-note { text-align: left; }
  .data-ribbon dl { grid-template-columns: repeat(2, 1fr); }
  .data-ribbon dl > div { min-height: 150px; padding: 22px 20px; border-bottom: 1px solid rgba(255,255,255,0.18); }
  .method-list li { grid-template-columns: 35px 58px 1fr; gap: 15px; }
  .method-icon { width: 54px; height: 54px; }
  .method-icon::before { width: 62px; }.method-icon::after { height: 62px; }
  .method-list small { display: none; }
  .method-list h3 { font-size: 19px; }
  .principles-graphic { min-height: 380px; }
  .principles-content { padding: 80px 20px; }
  .principles-grid { grid-template-columns: 1fr; margin-top: 45px; }
  .principles-grid article, .principles-grid article + article { padding: 24px 0; border-right: 0; border-bottom: 1px solid var(--line-dark); }
  .principles-grid article:last-child { border-bottom: 0; }
  .principles-grid h3 { margin-top: 14px; }
  .accordion summary { grid-template-columns: 30px 1fr 22px; gap: 10px; min-height: 76px; font-size: 14px; }
  .accordion details > div { padding: 0 30px 24px 40px; }
  .closing-section { min-height: 620px; }
  .closing-section h2 { font-size: 47px; }
  .closing-links { align-items: flex-start; flex-direction: column; gap: 20px; }
  .dialog-grid { grid-template-columns: 82px 1fr; }
  .dialog-identity { min-height: 530px; padding: 20px 12px; }
  .dialog-identity strong { font-size: 35px; }
  .dialog-content { padding: 32px 22px; }
  .dialog-content h2 { font-size: 30px; }
  .dialog-content dl { grid-template-columns: 1fr; }
  .dialog-content dl div, .dialog-content dl div + div { padding: 10px 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .dialog-content dl div:last-child { border-bottom: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  .has-js .reveal { opacity: 1; transform: none; }
}

@media (forced-colors: active) {
  .signal-dot, .graphic-point, .vessel-liquid, .dropper-level { forced-color-adjust: none; }
}