:root {
  --ink: #23252a;
  --ink-2: #3d4148;
  --steel: #5c626b;
  --mist: #f0f1f2;
  --paper: #ffffff;
  --warm: #f7f7f6;
  --line: #dcdfe3;
  --accent: #bd1e2d;
  --accent-dark: #951724;
  --accent-on-dark: #ed9aa3;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --signal: #bd1e2d;
  --text: #2e3238;
  --muted: #626871;
  --success: #555b62;
  --shadow: 0 16px 45px rgba(20, 24, 32, 0.08);
  --radius: 6px;
  /* Shared design roles: every page type uses these, not its own theme. */
  --graphite: #242930;
  --graphite-raised: #303741;
  --page-width: 1280px;
  --page-gutter: 48px;
  --section-space: 80px;
  --compact-space: 48px;
  --layout-gap: 32px;
  --sidebar-width: 340px;
  --panel-space: 32px;
  --text-display: clamp(40px, 5.2vw, 68px);
  --text-section: clamp(28px, 3.2vw, 40px);
  --text-panel: clamp(24px, 2.4vw, 30px);
  --text-card: 22px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
[id] { scroll-margin-top: 112px; }
body {
  margin: 0;
  color: var(--text);
  background: var(--paper);
  font-family: "Arial Narrow", Inter, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
img { max-width: 100%; height: auto; display: block; }
picture { display: block; min-width: 0; }
button, input, select, textarea { font: inherit; }
h1, h2, h3 { text-wrap: pretty; }
h2 { font-size: var(--text-panel); line-height: 1.35; }
h3 { font-size: var(--text-card); line-height: 1.4; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }

.skip-link {
  position: fixed;
  left: 16px;
  top: -80px;
  z-index: 100;
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--paper);
  color: var(--ink);
}
.skip-link:focus { top: 12px; }

.utility-bar { background: var(--mist); color: var(--muted); font-size: 10px; letter-spacing: .14em; }
.utility-inner { width: min(var(--page-width), calc(100% - var(--page-gutter))); min-height: 29px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; }
.utility-inner b { color: var(--ink); font-weight: 800; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(255,255,255,.97);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  width: min(var(--page-width), calc(100% - var(--page-gutter)));
  min-height: 84px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 34px;
}
.brand { display: inline-flex; align-items: center; gap: 12px; min-width: 220px; text-decoration: none; }
.brand-logo { display: block; width: 205px; height: auto; object-fit: contain; flex-shrink: 0; }
.site-nav { display: flex; align-items: stretch; align-self: stretch; gap: 0; margin-left: auto; }
.site-nav a { position: relative; display: flex; align-items: center; padding: 0 16px; text-decoration: none; color: var(--ink-2); font-size: 13px; font-weight: 700; }
.site-nav a::after { content: ""; position: absolute; left: 16px; right: 16px; bottom: 0; height: 3px; background: var(--accent); transform: scaleX(0); transform-origin: left; transition: transform .2s ease; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--ink); }
.site-nav a:hover::after, .site-nav a[aria-current="page"]::after { transform: scaleX(1); }
.site-nav a.nav-external { color: var(--ink-2); }
.site-nav a.nav-external span { margin-left: 5px; font-size: 10px; }
.header-actions { display: flex; align-items: center; gap: 10px; }
.language { color: var(--muted); font-size: 11px; letter-spacing: .1em; text-decoration: none; padding: 12px 8px; }
.header-cta { min-width: 126px; gap: 16px; border-radius: 2px; }
.header-cta b { font-size: 17px; }
.nav-toggle { display: none; border: 0; background: none; width: 42px; height: 42px; border-radius: 10px; }
.nav-toggle span, .nav-toggle::before, .nav-toggle::after { content: ""; display: block; width: 22px; height: 2px; background: var(--ink); margin: 5px auto; transition: .2s ease; }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 2px;
  border: 1px solid transparent;
  text-decoration: none;
  font-weight: 750;
  font-size: 14px;
  transition: transform .15s ease, background .15s ease, border-color .15s ease;
}
.button:hover { transform: translateY(-1px); }
.button-primary { background: var(--accent); color: #fff; }
.button-primary:hover { background: var(--accent-dark); }
.button-secondary { border-color: #aeb2b9; color: var(--ink); background: rgba(255,255,255,.8); }
.button-secondary:hover, .button-light:hover { background: var(--mist); border-color: var(--ink-2); }
.button-light { border-color: var(--line); background: #fff; color: var(--ink); }

.page-hero-grid > * { min-width: 0; }
.breadcrumb { display: flex; gap: 9px; flex-wrap: wrap; font-size: 11px; letter-spacing: .06em; color: var(--muted); margin-bottom: 42px; }
.breadcrumb a { text-decoration: none; }
.eyebrow { display: flex; align-items: center; gap: 12px; margin: 0 0 18px; color: var(--steel); font-size: 11px; font-weight: 800; letter-spacing: .2em; text-transform: uppercase; }
.eyebrow::before { content: ""; width: 32px; height: 2px; background: var(--accent); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }

.section { padding: var(--section-space) 0; }
.section-tight { padding: var(--compact-space) 0; }
.surface-muted { background: var(--mist); }
.container { width: min(var(--page-width), calc(100% - var(--page-gutter))); margin: 0 auto; }
.section-heading { display: grid; grid-template-columns: .75fr 1.25fr; gap: 44px; align-items: end; margin-bottom: 36px; padding-top: 22px; border-top: 1px solid #adb3bc; }
.section-heading h2 { margin: 0; color: var(--ink); font-size: var(--text-section); line-height: 1.25; letter-spacing: -.025em; }
.section-heading p { margin: 0; color: var(--muted); font-size: 16px; }
.kicker { display: block; margin-bottom: 10px; color: var(--accent-dark); font-size: 10px; font-weight: 850; letter-spacing: .18em; text-transform: uppercase; }

.spec-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border: 1px solid var(--line); background: var(--paper); }
.spec-card { position: relative; min-height: 172px; padding: 26px 28px; border: 0; border-right: 1px solid var(--line); border-radius: 0; background: var(--paper); }
.spec-card:last-child { border-right: 0; }
.spec-card::after { content: "↗"; position: absolute; right: 20px; top: 18px; color: #a9b5b8; font-size: 15px; }
.spec-card span { display: block; color: var(--muted); font-size: 12px; font-weight: 750; letter-spacing: .08em; text-transform: uppercase; }
.spec-card strong { display: block; margin-top: 24px; padding-right: 20px; color: var(--ink); font-size: 21px; line-height: 1.22; }
.spec-card small { display: block; margin-top: 10px; color: var(--muted); }

.process { position: relative; background: var(--graphite); color: #fff; overflow: hidden; }
.process::after { content: "PROCESS"; position: absolute; right: -16px; bottom: -86px; color: rgba(255,255,255,.025); font-size: clamp(120px, 18vw, 270px); font-weight: 900; letter-spacing: -.07em; line-height: 1; }
.process .section-heading { border-color: #515761; }
.process .section-heading h2 { color: #fff; }
.process .section-heading p { color: #c4cad2; }
.process .kicker { color: var(--accent-on-dark); }
.process-list { position: relative; z-index: 1; display: grid; grid-template-columns: repeat(6, 1fr); gap: 1px; background: #515761; border: 1px solid #515761; border-radius: 0; overflow: hidden; }
.process-step { position: relative; min-height: 210px; padding: 26px 22px; background: var(--graphite-raised); border-top: 2px solid #9da5ae; transition: background .2s ease; }
.process-step:first-child { border-top-color: #e17680; }
.process-step:not(:last-child)::after { content: "→"; position: absolute; top: 28px; right: 16px; color: #aeb7c2; }
.process-step:hover { background: #373d46; }
.process-step b { color: var(--accent-on-dark); font: 12px var(--mono); letter-spacing: .12em; }
.process-step h3 { margin: 42px 0 10px; font-size: 18px; }
.process-step p { margin: 0; color: #c4cad2; font-size: 13px; }

.content-grid, .article-layout { display: grid; grid-template-columns: minmax(0, 1fr) var(--sidebar-width); gap: var(--layout-gap); align-items: start; }
.panel { padding: var(--panel-space); border: 1px solid var(--line); border-radius: 0; background: var(--paper); }
.panel h2, .panel h3 { margin-top: 0; color: var(--ink); }
.check-list { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 24px; list-style: none; padding: 0; }
.check-list li { position: relative; padding-left: 26px; }
.check-list li::before { content: "✓"; position: absolute; left: 0; color: var(--success); font-weight: 900; }
.callout { position: sticky; top: 116px; border-color: var(--line); border-top: 4px solid var(--signal); background: var(--warm); }
.callout .label { color: var(--accent-dark); font-size: 10px; font-weight: 850; letter-spacing: .18em; }
.callout h2 { margin: 12px 0; font-size: var(--text-card); }
.callout p { color: var(--muted); }
.callout .button { width: 100%; margin-top: 10px; }

.inspection-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.inspection-item { position: relative; min-height: 142px; padding: 24px; border: 1px solid var(--line); border-radius: 0; background: #fff; }
.inspection-item::before { content: ""; display: block; width: 26px; height: 2px; margin-bottom: 24px; background: var(--accent); }
.inspection-item strong { display: block; color: var(--ink); }
.inspection-item span { display: block; color: var(--muted); font-size: 13px; margin-top: 6px; }

.related-strip { display: grid; grid-template-columns: 1.15fr repeat(3, 1fr); border: 1px solid var(--line); border-radius: 0; overflow: hidden; background: #fff; }
.related-intro, .related-card { padding: var(--panel-space); }
.related-intro { background: var(--mist); }
.related-intro h2 { margin: 0; color: var(--ink); font-size: var(--text-card); }
.related-card { position: relative; border-left: 1px solid var(--line); text-decoration: none; transition: background .2s ease; }
.related-card::after { content: "↗"; position: absolute; right: 22px; top: 20px; color: #aab4b7; }
.related-card:hover { background: var(--warm); }
.related-card span { color: var(--muted); font-size: 12px; }
.related-card strong { display: block; color: var(--ink); margin-top: 10px; }

.site-footer { color: #c7cdd5; background: var(--graphite); padding: 58px 0 26px; border-top: 1px solid #4d535c; }
.footer-grid { display: grid; grid-template-columns: 1.5fr .65fr .65fr; gap: 64px; }
.footer-brand { display: block; }
.footer-brand .kicker { margin-bottom: 22px; color: #d2a6ab; font: 10px var(--mono); letter-spacing: .12em; }
.footer-grid h2 { margin: 0 0 20px; color: #fff; font-size: var(--text-section); line-height: 1.35; letter-spacing: -.025em; }
.footer-brand p { color: #b8c0cb; margin: 0 0 24px; font-size: 14px; }
.footer-contact { display: inline-flex; align-items: center; gap: 40px; color: #fff; font-size: 14px; font-weight: 700; text-decoration: none; padding: 12px 0; border-bottom: 1px solid #bd6771; }
.footer-contact:hover { color: #ffc1c7; }
.footer-contact span { font-size: 22px; }
.footer-grid h3 { margin-top: 4px; padding-top: 16px; border-top: 1px solid #626976; color: #fff; font-size: 13px; letter-spacing: .12em; text-transform: uppercase; }
.footer-links { display: grid; gap: 8px; }
.footer-links a { padding: 7px 0; text-decoration: none; font-size: 13px; }
.footer-links a:hover { color: #fff; }
.footer-bottom { display: flex; justify-content: space-between; gap: 20px; margin-top: 52px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.11); font-size: 9px; letter-spacing: .11em; }

.page-hero { position: relative; overflow: hidden; color: var(--ink); background: linear-gradient(115deg, #fafafa 0%, #f4f4f3 58%, #e7e9ec 100%); border-bottom: 1px solid var(--line); }
.page-hero::after { content: ""; position: absolute; inset: 0 52% 0 0; pointer-events: none; background-image: linear-gradient(rgba(35,37,42,.025) 1px, transparent 1px), linear-gradient(90deg, rgba(35,37,42,.025) 1px, transparent 1px); background-size: 64px 64px; }
.page-hero-grid { position: relative; z-index: 1; width: min(var(--page-width), calc(100% - var(--page-gutter))); min-height: 560px; margin: 0 auto; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 64px; align-items: center; padding: 64px 0; }
.page-hero-code { display: flex; gap: 14px; align-items: center; margin: 0 0 34px; color: var(--muted); }
.page-hero-code b { color: var(--ink-2); font: 34px var(--mono); line-height: 1; letter-spacing: -.05em; }
.page-hero-code span { padding-left: 14px; border-left: 1px solid #b8bdc4; font-size: 8px; line-height: 1.4; letter-spacing: .16em; }
.page-hero h1 { margin: 12px 0 22px; max-width: 720px; font-size: var(--text-display); line-height: 1.12; letter-spacing: -.035em; font-weight: 800; }
.page-hero .lead { margin: 0; padding-left: 20px; border-left: 1px solid #b8bdc4; color: var(--muted); font-size: 16px; max-width: 650px; }
.page-tech-row { display: flex; flex-wrap: wrap; gap: 0; margin-top: 34px; border-top: 1px solid var(--line); }
.page-tech-row span { display: inline-flex; align-items: center; gap: 8px; padding: 13px 22px 0 0; margin-right: 22px; color: var(--muted); font-size: 10px; letter-spacing: .08em; }
.page-tech-row b { color: var(--accent-dark); font-size: 9px; font-family: var(--mono); }
.page-hero-media { position: relative; width: 100%; }
.technical-media { margin: 0; padding: 0; border: 1px solid #3b424c; background: var(--graphite); color: #fff; box-shadow: 12px 16px 0 #dadee3; }
.technical-media-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 13px 18px; border-top: 3px solid var(--accent); font: 10px var(--mono); letter-spacing: .1em; color: #d9dfe7; }
.technical-media-head > span:last-child { font-size: 18px; line-height: 1; color: #e998a1; }
.technical-photo { position: relative; background: var(--mist); }
.technical-photo img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; }
.technical-photo[data-media-fit="contain"] img { object-fit: contain; background: var(--paper); }
.technical-media figcaption { display: grid; grid-template-columns: 1.1fr 1fr; padding: 18px 20px; gap: 16px; border-top: 1px solid #6a737f; }
.technical-media figcaption > div + div { padding-left: 18px; border-left: 1px solid #565e68; }
.technical-media figcaption span { display: block; color: #bcc5d1; font-size: 11px; margin-bottom: 5px; }
.technical-media figcaption strong { font-size: 13px; font-weight: 650; }
.engineering-band { background: var(--graphite); color: #fff; border-bottom: 4px solid #b6bdc7; }
.engineering-band-inner { display: grid; grid-template-columns: .9fr repeat(3, 1fr); }
.engineering-band-intro, .engineering-point { padding: 32px 26px; }
.engineering-band-intro { padding-left: 0; }
.engineering-band-intro .kicker { color: var(--accent-on-dark); margin-bottom: 12px; font: 10px var(--mono); letter-spacing: .12em; }
.engineering-band-intro strong { display: block; font-size: 19px; margin-bottom: 6px; }
.engineering-band-intro > span:last-child { color: #b5bfce; font: 9px var(--mono); letter-spacing: .1em; }
.engineering-point { position: relative; border-left: 1px solid #4c5460; }
.engineering-point-code { color: #c4cdd9; font: 10px var(--mono); letter-spacing: .04em; }
.engineering-point-code::before { content: ""; display: inline-block; width: 5px; height: 5px; background: #e199a2; margin-right: 8px; vertical-align: 1px; }
.engineering-point h2 { margin: 13px 0 7px; font-size: 21px; letter-spacing: -.025em; font-weight: 650; }
.engineering-point p { margin: 0; color: #b9c3d0; font-size: 12px; line-height: 1.65; }
.engineering-point:not(:last-child)::after { content: "→"; position: absolute; top: 32px; right: 15px; font-size: 15px; color: #b6bfcb; }

.category-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: #bac1ca; border: 1px solid #bac1ca; counter-reset: material-family; }
.category-card { position: relative; counter-increment: material-family; min-height: 254px; padding: var(--panel-space); border: 0; border-radius: 0; background: linear-gradient(135deg, #fff 55%, #eef0f3); text-decoration: none; transition: background .2s ease, color .2s ease; }
.category-card::before { content: "0" counter(material-family); position: absolute; right: 23px; top: 24px; font: 11px var(--mono); color: #647080; }
.category-card::after { content: "↗"; position: absolute; right: 25px; bottom: 23px; color: #9daaad; font-size: 18px; }
.category-card:hover { background: var(--warm); color: var(--ink); box-shadow: inset 0 3px var(--accent); }
.category-card:hover h3 { color: var(--ink); }
.category-card:hover p { color: var(--muted); }
.category-card .code { display: block; max-width: calc(100% - 30px); color: #313a45; font: 700 clamp(18px, 2.1vw, 29px) var(--mono); letter-spacing: -.035em; }
.category-card .code::after { content: ""; display: block; width: 28px; height: 3px; margin-top: 21px; background: var(--accent); }
.category-card h3 { margin: 20px 0 8px; color: var(--ink); font-size: var(--text-card); }
.category-card p { margin: 0; color: var(--muted); font-size: 14px; }
.material-links { display: flex; flex-wrap: wrap; gap: 8px 20px; margin: 18px 0; align-items: center; }
.material-links a, .material-links > span { display: inline-flex; align-items: center; min-height: 44px; font-size: 14px; }
.material-links a { color: var(--accent-dark); text-underline-offset: 5px; }
.material-links [aria-current] { font-weight: 700; }
.grade-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.grade-card { position: relative; min-height: 112px; padding: 22px 24px; border-radius: 0; background: #fff; border: 1px solid var(--line); border-left: 3px solid transparent; text-decoration: none; transition: border-color .2s ease, transform .2s ease; }
.grade-card:hover { border-left-color: var(--accent); transform: translateY(-2px); }
.grade-card strong { display: block; color: var(--ink); font-size: 18px; }
.grade-card strong { font-family: var(--mono); letter-spacing: -.035em; font-size: 23px; }
.grade-card:first-child { background: var(--graphite-raised); border-color: var(--graphite-raised); border-left-color: var(--accent); }
.grade-card:first-child strong { color: #fff; }
.grade-card:first-child span { color: #c8d0db; }
.grade-card span { display: block; margin-top: 6px; color: var(--muted); font-size: 12px; }
.selector-band { position: relative; display: grid; grid-template-columns: 1.4fr auto; gap: var(--layout-gap); align-items: center; overflow: hidden; padding: var(--panel-space); border: 1px solid var(--line); border-left: 4px solid var(--accent); border-radius: 0; color: var(--ink); background: var(--warm); }
.selector-band::after { content: "SELECT"; position: absolute; right: 250px; bottom: -35px; color: rgba(35,37,42,.035); font-size: 100px; font-weight: 900; line-height: 1; }
.selector-band > * { position: relative; z-index: 1; }
.selector-band h2 { margin: 0; font-size: var(--text-panel); }
.selector-band p { margin: 8px 0 0; color: var(--muted); }

.quality-flow { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; counter-reset: quality; border: 1px solid var(--line); }
.quality-step { counter-increment: quality; min-height: 230px; padding: 28px 24px; background: #fff; border: 0; border-right: 1px solid var(--line); border-radius: 0; }
.quality-step { border-top: 3px solid #8c97a5; }
.quality-step::before { font-family: var(--mono); }
.quality-step:last-child { border-right: 0; background: var(--mist); color: var(--ink); }
.quality-step:last-child h3 { color: var(--ink); }
.quality-step:last-child p { color: var(--muted); }
.quality-step:last-child { border-top-color: var(--accent); background: var(--graphite-raised); }
.quality-step:last-child h3 { color: #fff; }
.quality-step:last-child p { color: #c8d0db; }
.quality-step:last-child::before { color: var(--accent-on-dark); }
.quality-step::before { content: "0" counter(quality); display: block; color: var(--accent-dark); font-weight: 850; font-size: 12px; letter-spacing: .12em; }
.quality-step h3 { margin: 48px 0 8px; color: var(--ink); }
.quality-step p { margin: 0; color: var(--muted); font-size: 13px; }
.trust-panel { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.trust-card { padding: var(--panel-space); border-radius: 0; background: #fff; border: 1px solid var(--line); border-top: 4px solid var(--steel); }
.trust-card h3 { margin: 0 0 10px; color: var(--ink); font-size: var(--text-card); }
.trust-card p { color: var(--muted); }
.faq { display: grid; gap: 10px; }
.faq details { border: 1px solid var(--line); border-radius: 0; background: #fff; padding: 0 22px; }
.faq summary { cursor: pointer; list-style: none; padding: 18px 34px 18px 0; color: var(--ink); font-weight: 750; position: relative; }
.faq summary::after { content: "+"; position: absolute; right: 2px; color: var(--accent-dark); font-size: 22px; }
.faq details[open] summary::after { content: "−"; }
.faq details p { color: var(--muted); margin: 0 0 18px; }

.article-body { background: var(--paper); border: 1px solid var(--line); border-radius: 0; padding: var(--panel-space); }
.article-body h2 { margin: var(--compact-space) 0 16px; padding-top: 18px; border-top: 1px solid var(--line); color: var(--ink); font-size: var(--text-panel); line-height: 1.35; }
.article-body h2:first-child { margin-top: 0; }
.article-body p { color: var(--ink-2); line-height: 1.85; }
.article-body img { width: 100%; border-radius: 0; margin: 32px 0; }
.article-meta { display: flex; flex-wrap: wrap; gap: 12px 22px; color: var(--muted); font-size: 13px; margin-top: 20px; }
.article-aside { position: sticky; top: 116px; display: grid; gap: 16px; }
.article-layout > *, .content-grid > *, .sustainability-grid > * { min-width: 0; }
.article-toc ol { margin: 0; padding-left: 20px; }
.article-toc a { display: block; padding: 9px 0; color: var(--ink-2); text-underline-offset: 4px; }
.article-toc a:hover { color: var(--accent-dark); }
.aside-card { padding: var(--panel-space); border: 1px solid var(--line); border-radius: 0; background: var(--warm); }
.article-toc { border-top: 4px solid var(--accent); }
.aside-card h2 { margin: 0 0 14px; color: var(--ink); font-size: var(--text-card); }
.aside-links { display: grid; gap: 10px; }
.aside-links a { text-decoration: none; color: var(--steel); }
.quote { position: relative; margin: 34px 0; padding: 30px 34px 30px 62px; border-left: 4px solid var(--signal); background: var(--warm); color: var(--ink); font-size: 18px; }
.quote::before { content: "“"; position: absolute; left: 22px; top: 13px; color: var(--signal); font-size: 46px; line-height: 1; }

.metric-band { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 0; overflow: hidden; }
.metric { position: relative; min-height: 170px; padding: var(--panel-space); background: #fff; }
.metric::after { content: "FOCUS"; position: absolute; right: 20px; top: 18px; color: #657075; font-size: 9px; letter-spacing: .15em; }
.metric strong { display: block; color: var(--ink); font-size: 46px; line-height: 1; letter-spacing: -.045em; }
.metric span { display: block; margin-top: 10px; color: var(--muted); }
.sustainability-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--layout-gap); align-items: center; }
.sustainability-copy { padding: var(--panel-space); border-left: 4px solid var(--accent); background: var(--warm); }
.sustainability-copy h2 { margin-top: 0; color: var(--ink); font-size: var(--text-panel); line-height: 1.35; }
.sustainability-media { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.sustainability-media img { width: 100%; aspect-ratio: 1 / 1; object-fit: cover; border-radius: 0; background: var(--mist); }
.principles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.principle { min-height: 230px; padding: var(--panel-space); background: var(--paper); color: var(--ink); border-radius: 0; border: 1px solid var(--line); border-top: 4px solid var(--steel); }
.principle:nth-child(2) { background: var(--warm); border-top-color: var(--accent); }
.principle b { color: var(--steel); font-size: 12px; letter-spacing: .12em; }
.principle h3 { margin: 22px 0 8px; }
.principle p { margin: 0; color: var(--muted); font-size: 13px; }

.inquiry-intro { color: var(--muted); }
.inquiry-boundary { padding: 16px 18px; border-left: 3px solid var(--steel); background: var(--warm); color: var(--muted); font-size: 14px; }
.inquiry-fields { min-width: 0; margin: 32px 0 0; padding: 24px 0 0; border: 0; border-top: 1px solid var(--line); }
.inquiry-fields legend { padding: 0 16px 0 0; color: var(--accent-dark); font-size: 13px; font-weight: 750; letter-spacing: .05em; }
.field-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.field { min-width: 0; display: grid; gap: 8px; align-content: start; }
.field-wide { grid-column: 1 / -1; }
.field label { color: var(--ink); font-size: 14px; font-weight: 700; }
.field input, .field select, .field textarea { display: block; width: 100%; min-width: 0; min-height: 48px; padding: 11px 12px; color: var(--ink); background: var(--paper); border: 1px solid #aeb2b9; border-radius: 2px; font-size: 16px; }
.field textarea { resize: vertical; }
.field input::placeholder, .field textarea::placeholder { color: var(--muted); opacity: 1; }
.field input:user-invalid, .field textarea:user-invalid { border-color: var(--accent); }
.field small { font-size: 13px; color: var(--muted); }
.inquiry-consent { display: flex; align-items: flex-start; gap: 12px; padding: 14px 0; margin-top: 16px; font-size: 14px; }
.inquiry-consent input { width: 20px; height: 20px; margin: 2px 0 0; flex-shrink: 0; accent-color: var(--accent); }
.inquiry-consent a { color: var(--accent-dark); text-underline-offset: 4px; padding: 12px 4px; }
.inquiry-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 12px; }
.button { cursor: pointer; }
.button:disabled, .button:disabled:hover { color: var(--muted); background: var(--mist); border-color: var(--line); transform: none; cursor: not-allowed; }
.inquiry-status { color: var(--ink-2); font-size: 14px; }
.inquiry-checklist { padding-left: 20px; color: var(--muted); }
.inquiry-checklist li { margin: 10px 0; }
.inquiry-panel + .callout .aside-links { margin-top: 24px; padding-top: 22px; border-top: 1px solid var(--line); }
.preview-route-notice { max-width: 880px; margin: 0 auto; border-top: 4px solid var(--accent); }
.preview-route-notice h1 { font-size: var(--text-section); line-height: 1.3; }
.preview-destination { overflow-wrap: anywhere; color: var(--muted); font-family: var(--mono); font-size: 13px; }

@media (max-width: 980px) {
  .header-inner { width: min(100% - 36px, 1280px); flex-wrap: wrap; }
  .site-nav { display: flex; order: 3; flex-basis: 100%; flex-wrap: wrap; margin: 0; background: #fff; }
  .js .header-inner { flex-wrap: nowrap; }
  .js .site-nav { display: none; position: absolute; left: 18px; right: 18px; top: 100%; max-height: calc(100dvh - 100px); overflow-y: auto; padding: 18px; flex-direction: column; align-items: flex-start; border: 1px solid var(--line); border-radius: 0; box-shadow: var(--shadow); }
  .js .site-nav[data-open="true"] { display: flex; }
  .site-nav a { width: 100%; padding: 12px 10px; }
  .site-nav a::after { left: 10px; right: auto; width: 42px; }
  .js .nav-toggle { display: block; }
  .header-actions { margin-left: auto; }
  .language { min-width: 44px; text-align: center; }
  .page-hero-grid { min-height: auto; }
  .spec-grid, .inspection-grid { grid-template-columns: repeat(2, 1fr); }
  .process-list { grid-template-columns: repeat(3, 1fr); }
  .content-grid { grid-template-columns: 1fr; }
  .callout { position: static; }
  .related-strip { grid-template-columns: 1fr 1fr; }
  .related-card { border-left: 0; border-top: 1px solid var(--line); }
  .page-hero-grid, .article-layout, .sustainability-grid { grid-template-columns: 1fr; }
  .page-hero-media { margin-right: 0; max-width: 820px; }
  .engineering-band-inner { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .engineering-band-intro { grid-column: 1 / -1; padding: 22px 0; border-bottom: 1px solid #4c5460; }
  .engineering-band-intro > span:last-child { display: none; }
  .engineering-band-intro strong { margin-bottom: 0; }
  .engineering-point { padding: 25px 18px; }
  .engineering-point:nth-child(2) { border-left: 0; }
  .category-grid { grid-template-columns: repeat(2, 1fr); }
  .grade-grid { grid-template-columns: repeat(2, 1fr); }
  .quality-flow { grid-template-columns: repeat(2, 1fr); }
  .quality-step { border-bottom: 1px solid var(--line); }
  .article-aside { position: static; }
  .principles { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  :root { --page-gutter: 28px; --section-space: 60px; --compact-space: 40px; --layout-gap: 24px; --panel-space: 22px; --text-card: 20px; }
  .utility-bar { display: none; }
  .header-inner { min-height: 66px; width: min(100% - 24px, 1200px); gap: 10px; }
  .brand { min-width: 0; }
  .brand-logo { width: 166px; height: auto; }
  .header-actions .button { display: none; }
  .page-hero h1 { overflow-wrap: anywhere; }
  .hero-actions .button { width: 100%; }
  .section-heading { grid-template-columns: 1fr; gap: 12px; }
  .spec-grid, .inspection-grid, .check-list { grid-template-columns: 1fr; }
  .spec-card { border-right: 0; border-bottom: 1px solid var(--line); }
  .spec-card:last-child { border-bottom: 0; }
  .process-list { grid-template-columns: 1fr 1fr; }
  .process-step { min-height: 150px; }
  .related-strip, .footer-grid { grid-template-columns: 1fr; }
  .related-card { border-top: 1px solid var(--line); }
  .page-hero-grid { padding: 44px 0 54px; gap: 40px; }
  .page-hero-code { margin-bottom: 25px; }
  .technical-media { box-shadow: 5px 7px 0 #dadee3; }
  .technical-media-head { padding: 10px 12px; font-size: 9px; }
  .technical-media figcaption { padding: 15px 12px; gap: 10px; }
  .technical-media figcaption > div + div { padding-left: 10px; }
  .technical-media figcaption strong { font-size: 12px; }
  .engineering-band-inner { grid-template-columns: 1fr; }
  .engineering-point, .engineering-point:nth-child(2) { padding: 20px 0; border: 0; border-top: 1px solid #4c5460; }
  .engineering-point:nth-child(2) { border-top: 0; }
  .engineering-point h2 { margin-top: 9px; font-size: 20px; }
  .engineering-point:not(:last-child)::after { content: "↓"; top: 24px; right: 8px; }
  .engineering-point p { max-width: calc(100% - 24px); }
  .category-card .code { font-size: 26px; }
  .category-grid, .grade-grid, .quality-flow, .trust-panel, .metric-band, .sustainability-grid { grid-template-columns: 1fr; }
  .selector-band { grid-template-columns: 1fr; }
  .field-grid { grid-template-columns: 1fr; gap: 20px; }
  .inquiry-actions .button { width: 100%; }
  .article-body { border-radius: 0; }
  .footer-brand { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; }
  .footer-links a, .aside-links a { min-height: 44px; display: flex; align-items: center; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}