/* Dashitou / Big Stone Fastener — industrial ToB (steel / concrete / charcoal) */
:root {
  --charcoal: #121417;
  --charcoal-2: #1a1e23;
  --steel-dark: #252b32;
  --steel: #3a434d;
  --steel-mid: #5c6770;
  --steel-lite: #9aa3ab;
  --concrete: #c8ced4;
  --amber: #d4a017;
  --amber-deep: #b8860b;
  --brand-red: #c1121f;
  --ink: #e8ecef;
  --ink-soft: #b0b8c0;
  --muted: #7a8490;
  --line: #2e363f;
  --line-strong: #4a5560;
  --panel: #1e242b;
  --panel-2: #161a1f;
  --max: 1140px;
  --narrow: 720px;
  --ease: cubic-bezier(.22, 1, .36, 1);
  --sans: "IBM Plex Sans", "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono: "IBM Plex Mono", "SF Mono", ui-monospace, Menlo, Consolas, monospace;
}
*, *::before, *::after { box-sizing: border-box }
html { scroll-behavior: smooth }
body {
  margin: 0;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--charcoal);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block }
a { color: var(--amber); text-decoration-thickness: 1px; text-underline-offset: 3px }
a:hover { color: var(--concrete) }
h1, h2, h3, h4 {
  font-family: var(--sans);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.015em;
  margin: 0 0 .55em;
  color: var(--ink);
}
h1 { font-size: clamp(1.85rem, 4.5vw, 2.85rem) }
h2 { font-size: clamp(1.55rem, 3vw, 2.25rem); font-weight: 600; color: var(--ink) }
h3 { font-size: clamp(1.05rem, 1.8vw, 1.25rem) }
p { margin: 0 0 1em; color: var(--ink-soft) }
.lede { font-size: clamp(1rem, 1.8vw, 1.12rem); max-width: 40em; color: var(--muted); font-weight: 400 }
.eyebrow {
  font-family: var(--mono);
  font-size: .68rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: .75rem;
}
.wrap { width: min(100% - 2.5rem, var(--max)); margin-inline: auto }
.wrap-narrow { width: min(100% - 2.5rem, var(--narrow)); margin-inline: auto }

.site-header {
  position: sticky; top: 0; z-index: 40;
  background: rgba(18, 20, 23, .94);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled { border-bottom-color: var(--line) }
.header-inner {
  width: min(100% - 2rem, var(--max));
  margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  min-height: 4rem; gap: 1rem; position: relative;
}
.logo { text-decoration: none; color: var(--ink); display: flex; align-items: baseline; gap: .55rem }
.logo-mark {
  font-family: var(--mono);
  font-size: 1.2rem;
  letter-spacing: .18em;
  font-weight: 800;
  color: var(--brand-red);
  line-height: 1;
}
.logo-sub { font-size: .78rem; color: var(--muted); letter-spacing: .04em }
.logo:hover .logo-mark { color: #e01828 }
.logo-img { height: 36px; width: auto; display: block }
.site-nav { display: flex; gap: 1.25rem; align-items: center; flex-wrap: wrap; justify-content: flex-end }
.site-nav a {
  text-decoration: none; color: var(--ink-soft);
  font-size: .72rem; letter-spacing: .08em; text-transform: uppercase;
}
.site-nav a:hover, .site-nav a.is-active { color: var(--ink) }
.site-nav a.nav-cta {
  background: var(--amber); color: var(--charcoal) !important;
  padding: .45rem .85rem; letter-spacing: .08em; font-weight: 600;
}
.site-nav a.nav-cta:hover { background: var(--concrete); color: var(--charcoal) !important }
.nav-toggle {
  display: none; background: none; border: 0; padding: .5rem; cursor: pointer;
  flex-direction: column; gap: 6px;
}
.nav-toggle span { display: block; width: 22px; height: 1.5px; background: var(--ink) }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: .85rem 1.45rem;
  border: 1px solid var(--amber);
  background: var(--amber);
  color: var(--charcoal);
  font-size: .72rem; letter-spacing: .1em; text-transform: uppercase;
  text-decoration: none; cursor: pointer; font-weight: 600;
  transition: background .2s, color .2s, border-color .2s;
}
.btn:hover { background: transparent; color: var(--amber) }
.btn-brass { background: var(--amber); border-color: var(--amber); color: var(--charcoal) }
.btn-brass:hover { background: transparent; color: var(--amber); border-color: var(--amber) }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line-strong) }
.btn-ghost:hover { border-color: var(--concrete); color: var(--concrete) }
.btn-on-dark { color: var(--ink); border-color: rgba(200, 206, 212, .35) }
.btn-on-dark:hover { border-color: var(--concrete); color: var(--concrete); background: transparent }
.btn-row { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 1.5rem }

.section { padding: clamp(3.25rem, 7vw, 5.25rem) 0 }
.section-head { max-width: 40em; margin-bottom: 2rem }
.section-muted { background: var(--charcoal-2) }
.section-panel { background: var(--panel-2); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line) }

.hero-industrial {
  position: relative;
  min-height: min(58vh, 520px);
  display: flex; align-items: flex-end;
  overflow: hidden;
  background: var(--charcoal-2);
  color: var(--ink);
}
.hero-industrial-bg { position: absolute; inset: 0 }
.hero-industrial-bg img, .hero-industrial-bg svg {
  width: 100%; height: 100%; object-fit: cover; display: block; opacity: .5;
}
.hero-industrial-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(105deg, rgba(18,20,23,.94) 0%, rgba(18,20,23,.78) 48%, rgba(18,20,23,.55) 100%);
}
.hero-industrial-inner {
  position: relative; z-index: 2;
  padding: clamp(2.25rem, 5vw, 3.5rem) 0 clamp(2.25rem, 4vw, 3rem);
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
}
.hero-industrial h1 { color: var(--ink); max-width: 16em }
.hero-lede { font-size: clamp(1rem, 1.8vw, 1.12rem); max-width: 38em; color: var(--ink-soft) }
.keywords-row { display: flex; flex-wrap: wrap; gap: .45rem; margin-top: 1rem }
.keywords-row span {
  font-family: var(--mono);
  font-size: .65rem; letter-spacing: .1em; text-transform: uppercase;
  border: 1px solid var(--line-strong); color: var(--steel-lite);
  padding: .3rem .65rem; background: rgba(0,0,0,.25);
}

.rfq-bench {
  background: var(--steel-dark);
  border: 1px solid var(--line-strong);
  border-left: 3px solid var(--amber);
  padding: clamp(1.35rem, 3vw, 1.85rem);
}
.rfq-bench-grid { display: grid; gap: 1.25rem }
@media (min-width: 860px) {
  .rfq-bench-grid { grid-template-columns: 1.2fr 1fr; gap: 2rem; align-items: center }
}
.rfq-bench h2 { margin-bottom: .4rem; font-size: clamp(1.2rem, 2.2vw, 1.55rem) }
.rfq-fields {
  display: grid; gap: .55rem;
  font-family: var(--mono); font-size: .72rem; letter-spacing: .04em;
  color: var(--steel-lite);
}
.rfq-fields span {
  display: flex; align-items: center; gap: .5rem;
  padding: .45rem .65rem;
  background: var(--panel-2);
  border: 1px solid var(--line);
}
.rfq-fields span::before {
  content: "";
  width: 6px; height: 6px;
  background: var(--amber);
  flex-shrink: 0;
}

.scenario-grid {
  display: grid; gap: 1rem;
  grid-template-columns: 1fr;
}
@media (min-width: 700px) { .scenario-grid { grid-template-columns: repeat(2, 1fr) } }
@media (min-width: 1000px) { .scenario-grid { grid-template-columns: repeat(3, 1fr) } }
.scenario-card {
  display: block; text-decoration: none; color: inherit;
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 1.35rem 1.25rem 1.45rem;
  transition: border-color .2s, background .2s;
}
.scenario-card:hover {
  border-color: var(--amber);
  background: var(--steel-dark);
}
.scenario-card .sc-code {
  font-family: var(--mono);
  font-size: .62rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--amber); margin-bottom: .55rem;
}
.scenario-card h3 { margin: 0 0 .4rem; color: var(--ink); font-size: 1.1rem }
.scenario-card p { margin: 0 0 .85rem; font-size: .9rem; color: var(--ink-soft) }
.scenario-card .sc-meta {
  display: flex; flex-wrap: wrap; gap: .35rem;
  font-family: var(--mono); font-size: .62rem; letter-spacing: .06em;
  text-transform: uppercase; color: var(--muted);
}
.scenario-card .sc-meta span {
  border: 1px solid var(--line); padding: .25rem .5rem; color: var(--steel-lite);
}
.scenario-card .sc-action {
  margin-top: .9rem;
  font-size: .7rem; letter-spacing: .1em; text-transform: uppercase;
  color: var(--amber); font-weight: 600;
}

.series-index {
  display: grid; gap: 0;
  border: 1px solid var(--line);
  background: var(--panel);
}
.series-row {
  display: grid; gap: .35rem 1rem;
  padding: 1rem 1.15rem;
  border-bottom: 1px solid var(--line);
  text-decoration: none; color: inherit;
  transition: background .15s;
}
.series-row:last-child { border-bottom: 0 }
.series-row:hover { background: var(--steel-dark) }
@media (min-width: 700px) {
  .series-row {
    grid-template-columns: 1.1fr 1.4fr auto;
    align-items: center;
  }
}
.series-row h3 { margin: 0; font-size: 1rem }
.series-row .sr-desc { margin: 0; font-size: .88rem; color: var(--ink-soft) }
.series-row .sr-link {
  font-family: var(--mono); font-size: .65rem; letter-spacing: .1em;
  text-transform: uppercase; color: var(--amber);
}

.laws-grid { display: grid; gap: 1rem }
@media (min-width: 800px) { .laws-grid { grid-template-columns: repeat(3, 1fr) } }
.law-card {
  padding: 1.35rem 1.25rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 2px solid var(--amber);
}
.law-card h3 { margin-bottom: .45rem }
.stance-split { display: grid; gap: 2rem }
@media (min-width: 860px) {
  .stance-split { grid-template-columns: 1fr 1.15fr; gap: 3rem; align-items: center }
}
.stance-media { aspect-ratio: 5/4; overflow: hidden; background: var(--steel-dark); border: 1px solid var(--line) }
.stance-media img, .stance-media svg { width: 100%; height: 100%; object-fit: cover; opacity: .7 }

/* Image swap V3 — industrial media (no cream / soft shadow) */
.scenario-card {
  padding: 0 0 1.25rem;
  overflow: hidden;
}
.scenario-card .sc-media {
  aspect-ratio: 4/3;
  background: var(--steel-dark);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
  margin: 0 0 .85rem;
}
.scenario-card .sc-media img {
  width: 100%; height: 100%;
  object-fit: cover; display: block;
  opacity: .92;
}
.scenario-card .sc-code,
.scenario-card h3,
.scenario-card > p,
.scenario-card .sc-meta,
.scenario-card .sc-action {
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}
.scenario-card .sc-code { padding-top: 0; margin-bottom: .45rem }

.rfq-side {
  display: grid; gap: .85rem;
}
.rfq-side-fig {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--panel-2);
  aspect-ratio: 4/3;
  overflow: hidden;
  opacity: .85;
}
.rfq-side-fig img {
  width: 100%; height: 100%;
  object-fit: cover; display: block;
}
@media (min-width: 860px) {
  .rfq-bench-grid { align-items: start }
}

.series-row {
  grid-template-columns: 56px 1fr;
  align-items: center;
}
.series-row .sr-thumb {
  width: 56px; height: 56px;
  background: var(--steel-dark);
  border: 1px solid var(--line);
  overflow: hidden;
  flex-shrink: 0;
}
.series-row .sr-thumb img {
  width: 100%; height: 100%;
  object-fit: contain; display: block;
  background: #1a1d21;
}
.series-row h3 { grid-column: 2 }
.series-row .sr-desc { grid-column: 2 }
.series-row .sr-link { grid-column: 2 }
@media (min-width: 700px) {
  .series-row {
    grid-template-columns: 64px 1.1fr 1.4fr auto;
    align-items: center;
  }
  .series-row .sr-thumb { width: 64px; height: 64px }
  .series-row h3 { grid-column: auto }
  .series-row .sr-desc { grid-column: auto }
  .series-row .sr-link { grid-column: auto }
}

.stance-media img { opacity: .85 }

.product-series-media {
  aspect-ratio: 1/1;
  max-width: 360px;
  margin: 0 0 1.25rem;
  border: 1px solid var(--line);
  background: #1a1d21;
  overflow: hidden;
}
.product-series-media img {
  width: 100%; height: 100%;
  object-fit: contain; display: block;
  background: #1a1d21;
}


.apps-grid { display: grid; gap: 1rem; grid-template-columns: 1fr }
@media (min-width: 700px) { .apps-grid { grid-template-columns: repeat(2, 1fr) } }
@media (min-width: 1000px) { .apps-grid { grid-template-columns: repeat(3, 1fr) } }
.app-card {
  padding: 1.35rem 1.25rem;
  background: var(--panel);
  border: 1px solid var(--line);
  text-decoration: none; color: inherit; display: block;
  transition: border-color .2s;
}
.app-card:hover { border-color: var(--amber) }
.app-card h3 { margin-bottom: .35rem }
.app-card p { margin: 0; font-size: .9rem }

.product-grid { display: grid; gap: 1rem; grid-template-columns: 1fr }
@media (min-width: 700px) { .product-grid { grid-template-columns: repeat(2, 1fr) } }
@media (min-width: 1000px) { .product-grid { grid-template-columns: repeat(3, 1fr) } }
.product-card {
  text-decoration: none; color: inherit; display: block;
  background: var(--panel); border: 1px solid var(--line);
  transition: border-color .2s;
}
.product-card:hover { border-color: var(--amber) }
.product-card .thumb {
  display: block; position: relative; aspect-ratio: 16/9; overflow: hidden;
  background: var(--steel-dark); margin: 0; border-bottom: 1px solid var(--line);
}
.product-card .thumb img, .product-card .thumb svg {
  width: 100%; height: 100%; object-fit: cover; position: absolute; inset: 0; opacity: .75;
}
.product-card .card-body { padding: 1rem 1.1rem 1.2rem }
.product-card h3 { font-size: 1.05rem; margin: 0 0 .25rem; color: var(--ink) }
.product-card .cn { font-size: .82rem; color: var(--muted); margin: 0 0 .4rem }
.product-card .short { font-size: .88rem; color: var(--ink-soft); margin: 0 0 .55rem }
.product-card .spec-chips { display: flex; flex-wrap: wrap; gap: .3rem }
.chip {
  font-family: var(--mono); font-size: .6rem; letter-spacing: .06em; text-transform: uppercase;
  border: 1px solid var(--line); padding: .22rem .45rem; color: var(--steel-lite);
}

.faq details { border-bottom: 1px solid var(--line); padding: 1rem 0 }
.faq summary {
  cursor: pointer; font-family: var(--sans); font-weight: 600;
  font-size: 1.05rem; color: var(--ink); list-style: none;
}
.faq summary::-webkit-details-marker { display: none }
.faq summary::after { content: "+"; float: right; color: var(--muted); font-weight: 400 }
.faq details[open] summary::after { content: "–" }
.faq p { margin: .75rem 0 .25rem }
.capsule {
  background: var(--panel);
  border-left: 3px solid var(--amber);
  padding: 1.15rem 1.35rem;
  margin: 1.25rem 0 1.75rem;
  font-size: 1rem; color: var(--ink-soft); max-width: 42em;
}

.form-card {
  background: var(--panel);
  padding: clamp(1.35rem, 3.5vw, 2.15rem);
  border: 1px solid var(--line);
  max-width: 640px;
}
.form-row { margin-bottom: 1rem }
.form-row label {
  display: block; font-family: var(--mono);
  font-size: .65rem; letter-spacing: .1em; text-transform: uppercase;
  color: var(--muted); margin-bottom: .35rem;
}
.form-row input, .form-row select, .form-row textarea {
  width: 100%; padding: .7rem .8rem;
  border: 1px solid var(--line-strong);
  background: var(--charcoal);
  color: var(--ink); font: inherit;
}
.form-row textarea { min-height: 130px; resize: vertical }
.form-row input:focus, .form-row select:focus, .form-row textarea:focus {
  outline: 1px solid var(--amber); border-color: var(--amber);
}
.form-row input::placeholder, .form-row textarea::placeholder { color: var(--muted) }
.mailto-fallback {
  margin-top: 1.35rem; padding-top: 1.15rem;
  border-top: 1px solid var(--line); font-size: .9rem;
}

.cta-band {
  background: var(--steel-dark);
  color: var(--ink);
  padding: clamp(2.75rem, 6vw, 4rem) 0;
  text-align: center;
  border-top: 1px solid var(--line);
}
.cta-band h2 { color: var(--ink) }
.cta-band p { color: var(--ink-soft); margin-inline: auto; max-width: 34em }
.cta-band .btn-brass { background: var(--amber); color: var(--charcoal); border-color: var(--amber) }
.cta-band .btn-brass:hover { background: transparent; color: var(--amber); border-color: var(--amber) }
.cta-band .btn-ghost {
  color: var(--ink); border-color: var(--line-strong); background: transparent;
}
.cta-band .btn-ghost:hover { border-color: var(--concrete); color: var(--concrete) }

.site-footer {
  border-top: 1px solid var(--line);
  padding: 2.75rem 0 1.75rem;
  background: var(--panel-2);
}
.footer-grid {
  width: min(100% - 2.5rem, var(--max));
  margin: 0 auto 1.75rem;
  display: grid; gap: 1.75rem;
}
@media (min-width: 700px) { .footer-grid { grid-template-columns: 1.4fr 1fr 1fr 1fr } }
.footer-brand { font-family: var(--mono); font-size: 1.05rem; letter-spacing: .08em; color: var(--ink); margin: 0 0 .35rem }
.footer-tag { color: var(--amber); margin: 0 0 .5rem; font-size: .9rem }
.footer-place { font-size: .85rem }
.footer-label {
  font-family: var(--mono); font-size: .62rem; letter-spacing: .12em;
  text-transform: uppercase; color: var(--muted); margin-bottom: .65rem;
}
.site-footer a {
  display: block; text-decoration: none; color: var(--ink-soft);
  font-size: .9rem; margin-bottom: .35rem;
}
.site-footer a:hover { color: var(--amber) }
.footer-note {
  width: min(100% - 2.5rem, var(--max));
  margin: 0 auto; font-size: .75rem; color: var(--muted);
  border-top: 1px solid var(--line); padding-top: 1.1rem;
}
.breadcrumb { font-size: .75rem; color: var(--muted); margin-bottom: 1.1rem }
.breadcrumb a { color: var(--muted); text-decoration: none }
.breadcrumb a:hover { color: var(--amber) }
.page-hero { padding: clamp(2.25rem, 5vw, 3.5rem) 0 0 }
.specs-table { width: 100%; border-collapse: collapse; font-size: .9rem; margin: 1rem 0 1.35rem }
.specs-table th, .specs-table td {
  text-align: left; padding: .6rem 0;
  border-bottom: 1px solid var(--line); vertical-align: top;
}
.specs-table th {
  width: 34%; color: var(--muted); font-weight: 500;
  font-family: var(--mono); font-size: .68rem; letter-spacing: .06em; text-transform: uppercase;
}
.specs-table td { color: var(--ink-soft) }
.center-page {
  min-height: 60vh; display: grid; place-items: center;
  text-align: center; padding: 3rem 1.5rem;
}
.list-clean { list-style: none; padding: 0; margin: 0 0 1.35rem }
.list-clean li {
  padding: .55rem 0; border-bottom: 1px solid var(--line);
  color: var(--ink-soft); padding-left: 1rem; position: relative;
}
.list-clean li::before {
  content: ""; position: absolute; left: 0; top: 1.05rem;
  width: 5px; height: 5px; background: var(--amber);
}

@media (max-width: 760px) {
  .nav-toggle { display: flex }
  .site-nav {
    display: none; position: absolute; left: 0; right: 0; top: 100%;
    flex-direction: column; gap: 0;
    background: var(--charcoal-2); border-bottom: 1px solid var(--line);
    padding: .5rem 1.25rem 1.25rem; align-items: stretch;
  }
  .site-nav.is-open { display: flex }
  .site-nav a { padding: .7rem 0; border-bottom: 1px solid var(--line); width: 100% }
  .site-nav a.nav-cta { display: inline-block; margin-top: .5rem; text-align: center; width: auto }
  .btn { width: 100% }
  .btn-row .btn { width: auto; flex: 1 1 auto; min-width: 140px }
  .footer-grid { grid-template-columns: 1fr 1fr }
}


/* === v1.2 peer polish — strips / panels (industrial dark; no cream) === */
.markets-strip {
  border-bottom: 1px solid var(--line);
  background: var(--panel-2);
  padding: 1rem 0;
}
.markets-strip .wrap {
  display: flex; flex-wrap: wrap; align-items: center; gap: .75rem 1.5rem;
}
.markets-label {
  font-family: var(--mono);
  font-size: .62rem; letter-spacing: .14em; text-transform: uppercase;
  color: var(--muted); margin: 0;
}
.markets-list {
  list-style: none; margin: 0; padding: 0;
  display: flex; flex-wrap: wrap; gap: .45rem;
}
.markets-list li {
  font-family: var(--mono);
  font-size: .68rem; letter-spacing: .08em; text-transform: uppercase;
  color: var(--steel-lite);
  border: 1px solid var(--line-strong);
  padding: .35rem .75rem;
  background: var(--charcoal);
}

.what-to-send {
  margin: 1.15rem 0 0;
  padding: 1rem 1.05rem;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-left: 3px solid var(--amber);
}
.wts-title {
  font-family: var(--mono);
  font-size: .65rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--amber); margin: 0 0 .65rem;
}
.wts-list {
  list-style: none; margin: 0; padding: 0;
  display: grid; gap: .4rem;
}
.wts-list li {
  font-size: .92rem; color: var(--ink-soft);
  padding-left: 1rem; position: relative;
}
.wts-list li::before {
  content: "";
  position: absolute; left: 0; top: .55rem;
  width: 6px; height: 6px; background: var(--amber);
}

.series-row .sr-body { min-width: 0 }
.series-row .sr-tags {
  display: flex; flex-wrap: wrap; gap: .3rem;
  margin: .35rem 0 .4rem;
}
.series-row .sr-tags span {
  font-family: var(--mono);
  font-size: .58rem; letter-spacing: .06em; text-transform: uppercase;
  border: 1px solid var(--line); padding: .2rem .45rem;
  color: var(--steel-lite);
}
.series-row {
  grid-template-columns: 56px 1fr;
  align-items: start;
}
.series-row .sr-thumb { grid-row: 1 / span 2 }
.series-row .sr-body { grid-column: 2 }
.series-row .sr-link { grid-column: 2; margin-top: .25rem }
.series-row h3 { margin: 0 }
@media (min-width: 700px) {
  .series-row {
    grid-template-columns: 64px 1.35fr auto;
    align-items: center;
  }
  .series-row .sr-thumb { grid-row: auto }
  .series-row .sr-body { grid-column: auto }
  .series-row .sr-link { grid-column: auto; margin-top: 0 }
}

.tech-support-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 2px solid var(--amber);
  padding: clamp(1.35rem, 3vw, 1.85rem);
}
.tech-support-list {
  list-style: none; margin: 0; padding: 0;
  display: grid; gap: .75rem;
  max-width: 46em;
}
.tech-support-list li {
  color: var(--ink-soft);
  padding-left: 1rem; position: relative;
  font-size: .95rem;
}
.tech-support-list li::before {
  content: "";
  position: absolute; left: 0; top: .55rem;
  width: 6px; height: 6px; background: var(--amber);
}
.tech-support-list strong { color: var(--ink); font-weight: 600 }

.app-case {
  display: grid; gap: 1.5rem;
  align-items: start;
}
@media (min-width: 860px) {
  .app-case {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1.15fr);
    gap: 2.25rem;
  }
}
.app-case-media {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--steel-dark);
  overflow: hidden;
}
.app-case-media img {
  width: 100%; aspect-ratio: 4/3; object-fit: cover; display: block;
  opacity: .92;
}
.app-case-media figcaption {
  font-size: .82rem; color: var(--muted);
  padding: .7rem .85rem;
  border-top: 1px solid var(--line);
  background: var(--panel-2);
  line-height: 1.45;
}
.app-case-copy h2 { margin-top: 0 }

.docs-welcome {
  margin: .85rem 0 1rem;
  padding: .85rem 1rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--amber);
  color: var(--ink-soft);
  font-size: .95rem;
  max-width: 46em;
}
.docs-welcome strong { color: var(--ink) }
.docs-stub {
  color: var(--ink-soft);
  max-width: 40em;
  padding: .85rem 1rem;
  background: var(--panel);
  border: 1px solid var(--line);
}

/* Keep mobile RFQ CTA visible / usable */
@media (max-width: 760px) {
  .site-nav a.nav-cta {
    display: inline-block; margin-top: .5rem; text-align: center; width: auto;
  }
  .what-to-send { margin-top: 1rem }
  .markets-strip .wrap { gap: .55rem 1rem }
}


/* === v1.3 Ruike pro-feel polish — density / desk chrome (dark industrial; no cream) === */
.section-head h2 { color: var(--ink) }
.section-head .lede { color: var(--muted) }

/* What to send — printable job-sheet checklist */
.what-to-send {
  margin: 1.15rem 0 0;
  padding: 1.05rem 1.1rem 1.15rem;
  background: var(--panel-2);
  border: 1px solid var(--line-strong);
  border-left: 3px solid var(--amber);
}
.wts-title {
  font-family: var(--mono);
  font-size: .65rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--amber); margin: 0 0 .75rem;
}
.wts-checklist {
  list-style: none; margin: 0; padding: 0;
  display: grid; gap: 0;
  border: 1px solid var(--line);
  background: var(--charcoal);
}
.wts-checklist li {
  display: grid;
  grid-template-columns: 2.75rem 1fr;
  align-items: baseline;
  gap: .65rem;
  padding: .55rem .75rem;
  border-bottom: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: .92rem;
}
.wts-checklist li:last-child { border-bottom: 0 }
.wts-num {
  font-family: var(--mono);
  font-size: .72rem; letter-spacing: .08em;
  color: var(--amber); font-weight: 600;
}
.wts-item { color: var(--ink-soft) }

/* Legacy bullet list unused after v1.3; keep harmless */
.wts-list { list-style: none; margin: 0; padding: 0; display: grid; gap: .4rem }

/* Series engineering short-label */
.series-row .sr-eng {
  margin: .25rem 0 .35rem;
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .02em;
  line-height: 1.4;
  color: var(--steel-lite);
}

/* Numbered process path (Define/Discuss/Agree function) */
.process-path {
  list-style: none; margin: 0 0 1.5rem; padding: 0;
  display: grid; gap: .85rem;
  max-width: 48em;
}
.process-path li {
  display: grid; gap: .35rem;
  padding: .9rem 1rem;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-left: 3px solid var(--amber);
}
.pp-code {
  font-family: var(--mono);
  font-size: .68rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--amber); font-weight: 600;
}
.process-path p { margin: 0; font-size: .92rem; color: var(--ink-soft) }

/* Evidence strip — 3 cards */
.evidence-strip { margin-top: .25rem }
.evidence-label {
  font-family: var(--mono);
  font-size: .62rem; letter-spacing: .14em; text-transform: uppercase;
  color: var(--muted); margin: 0 0 .85rem;
}
.evidence-grid {
  display: grid; gap: .85rem;
  grid-template-columns: 1fr;
}
@media (min-width: 800px) {
  .evidence-grid { grid-template-columns: repeat(3, 1fr) }
}
.evidence-card {
  padding: 1.15rem 1.1rem;
  background: var(--steel-dark);
  border: 1px solid var(--line);
  border-top: 2px solid var(--amber);
}
.evidence-card h3 {
  margin: 0 0 .4rem;
  font-size: 1rem;
  color: var(--ink);
}
.evidence-card p {
  margin: 0;
  font-size: .88rem;
  color: var(--ink-soft);
}
.evidence-note {
  margin: .95rem 0 0;
  font-size: .85rem;
  color: var(--muted);
  max-width: 46em;
}
.evidence-note a { color: var(--amber) }

/* Buyer prep strip */
.buyer-prep-grid {
  display: grid; gap: 1rem;
  grid-template-columns: 1fr;
}
@media (min-width: 800px) {
  .buyer-prep-grid { grid-template-columns: repeat(3, 1fr) }
}
.buyer-prep-card {
  padding: 1.35rem 1.25rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--amber);
}
.buyer-prep-card .bp-code {
  font-family: var(--mono);
  font-size: .68rem; letter-spacing: .12em;
  color: var(--amber); margin: 0 0 .55rem; font-weight: 600;
}
.buyer-prep-card h3 { margin: 0 0 .45rem; font-size: 1.05rem }
.buyer-prep-card p { margin: 0 0 .85rem; font-size: .9rem; color: var(--ink-soft) }
.buyer-prep-card a {
  font-family: var(--mono);
  font-size: .68rem; letter-spacing: .08em; text-transform: uppercase;
  text-decoration: none; color: var(--amber); font-weight: 600;
}
.buyer-prep-card a:hover { color: var(--concrete) }

/* Contact — what happens next */
.next-steps {
  list-style: none; margin: 1.15rem 0 0; padding: 0;
  display: grid; gap: 0;
  max-width: 40em;
  border: 1px solid var(--line);
  background: var(--panel);
}
.next-steps li {
  display: grid;
  grid-template-columns: 2.75rem 1fr;
  gap: .65rem;
  align-items: start;
  padding: .75rem .9rem;
  border-bottom: 1px solid var(--line);
}
.next-steps li:last-child { border-bottom: 0 }
.next-steps .ns-num {
  font-family: var(--mono);
  font-size: .72rem; letter-spacing: .08em;
  color: var(--amber); font-weight: 600; padding-top: .1rem;
}
.next-steps .ns-body { min-width: 0 }
.next-steps .ns-body strong {
  display: block; color: var(--ink); font-size: .95rem; margin-bottom: .2rem;
}
.next-steps .ns-body span { color: var(--ink-soft); font-size: .88rem }

/* Applications caption — install-node sentence weight */
.app-case-media figcaption {
  font-size: .84rem;
  color: var(--steel-lite);
  line-height: 1.4;
}

@media (max-width: 760px) {
  .wts-checklist li { grid-template-columns: 2.4rem 1fr; padding: .5rem .65rem }
  .buyer-prep-card { border-left-width: 3px }
  .process-path li { padding: .8rem .85rem }
}

/* —— v1.4 Guides desk / checklist —— */
.guide-hub-grid {
  display: grid; gap: 1rem;
  grid-template-columns: 1fr;
  margin-top: 1.5rem;
}
@media (min-width: 800px) {
  .guide-hub-grid { grid-template-columns: repeat(3, 1fr) }
}
.guide-hub-card {
  padding: 1.4rem 1.3rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 3px solid var(--amber);
  display: flex; flex-direction: column; gap: .55rem;
}
.guide-hub-card .gh-code {
  font-family: var(--mono);
  font-size: .68rem; letter-spacing: .12em;
  color: var(--amber); margin: 0; font-weight: 600;
}
.guide-hub-card h2 { font-size: 1.15rem; margin: 0 }
.guide-hub-card p { margin: 0; font-size: .9rem; flex: 1 }
.guide-hub-card a.gh-link {
  font-family: var(--mono);
  font-size: .68rem; letter-spacing: .08em; text-transform: uppercase;
  text-decoration: none; color: var(--amber); font-weight: 600;
  margin-top: .35rem;
}
.guide-hub-card a.gh-link:hover { color: var(--concrete) }

.guide-desk {
  margin: 1.5rem 0;
  border: 1px solid var(--line);
  background: var(--panel);
}
.guide-desk-head {
  display: flex; align-items: baseline; justify-content: space-between; gap: 1rem;
  padding: .75rem 1rem;
  border-bottom: 1px solid var(--line);
  background: var(--panel-2);
}
.guide-desk-head h2 { margin: 0; font-size: 1.05rem }
.guide-desk-head .desk-meta {
  font-family: var(--mono); font-size: .65rem; letter-spacing: .1em;
  text-transform: uppercase; color: var(--muted); white-space: nowrap;
}
.guide-checklist {
  list-style: none; margin: 0; padding: 0;
}
.guide-checklist > li {
  display: grid;
  grid-template-columns: 2.75rem 1fr;
  gap: .65rem;
  align-items: start;
  padding: .7rem 1rem;
  border-bottom: 1px solid var(--line);
}
.guide-checklist > li:last-child { border-bottom: 0 }
.guide-checklist .gc-num {
  font-family: var(--mono);
  font-size: .72rem; letter-spacing: .08em;
  color: var(--amber); font-weight: 600; padding-top: .15rem;
}
.guide-checklist .gc-body { min-width: 0 }
.guide-checklist .gc-body strong {
  display: block; color: var(--ink); font-size: .95rem; margin-bottom: .2rem;
}
.guide-checklist .gc-body span,
.guide-checklist .gc-body p {
  margin: 0; color: var(--ink-soft); font-size: .88rem;
}
.guide-checklist .gc-body ul {
  margin: .35rem 0 0; padding-left: 1.1rem; color: var(--ink-soft); font-size: .86rem;
}
.guide-checklist .gc-body li { margin: .15rem 0 }

.rfq-points {
  list-style: none; margin: .85rem 0 0; padding: 0;
  border: 1px solid var(--line);
  background: var(--panel-2);
}
.rfq-points li {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  gap: .5rem;
  padding: .45rem .75rem;
  border-bottom: 1px solid var(--line);
  font-size: .86rem;
}
.rfq-points li:last-child { border-bottom: 0 }
.rfq-points .rp-label {
  font-family: var(--mono);
  font-size: .65rem; letter-spacing: .08em; text-transform: uppercase;
  color: var(--amber); font-weight: 600; padding-top: .15rem;
}
.rfq-points .rp-text { color: var(--ink-soft); margin: 0 }

.guide-toc {
  display: flex; flex-wrap: wrap; gap: .5rem .85rem;
  margin: 1rem 0 0; padding: 0; list-style: none;
  font-family: var(--mono); font-size: .72rem; letter-spacing: .06em;
}
.guide-toc a { text-decoration: none; color: var(--amber) }
.guide-toc a:hover { color: var(--concrete) }

.series-guide-link {
  display: block;
  margin: .65rem 0 0;
  font-size: .88rem;
  color: var(--ink-soft);
}
.series-guide-link a { color: var(--amber); font-weight: 600; text-decoration: none }
.series-guide-link a:hover { color: var(--concrete) }

.about-confirm-grid {
  display: grid; gap: 1rem;
  grid-template-columns: 1fr;
  margin: 1.25rem 0;
}
@media (min-width: 720px) {
  .about-confirm-grid { grid-template-columns: repeat(3, 1fr) }
}
.about-confirm-card {
  padding: 1.15rem 1.1rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--amber);
}
.about-confirm-card h3 { margin: 0 0 .4rem; font-size: 1rem }
.about-confirm-card p { margin: 0; font-size: .88rem }


/* media-open: install-node photo pending */
.media-open {
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 1rem 1.1rem;
  box-sizing: border-box;
  background: var(--steel-dark);
  color: var(--muted);
  font-size: .82rem;
  letter-spacing: .04em;
  line-height: 1.45;
  border: 0;
}
.app-case-media .media-open {
  width: 100%;
  border-bottom: 0;
}
.scenario-card .sc-media .media-open {
  width: 100%;
  height: 100%;
  margin: 0;
  border: 0;
}

/* path interim: series product still while install-node Open */
.sc-media.media-interim,
.app-case-media.media-interim {
  position: relative;
}
.media-interim-badge {
  position: absolute;
  left: .65rem;
  bottom: .65rem;
  z-index: 2;
  padding: .28rem .55rem;
  background: rgba(12,14,16,.82);
  border: 1px solid var(--amber, #c9a227);
  color: var(--muted, #b8bdc4);
  font-size: .68rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  line-height: 1.3;
  pointer-events: none;
}
.scenario-card .sc-media.media-interim img {
  object-fit: contain;
  background: #1a1d21;
  opacity: 1;
}
.app-case-media.media-interim img {
  object-fit: contain;
  background: #1a1d21;
  aspect-ratio: 4/3;
  opacity: 1;
}

/* visual-close 2026-10-30: product-still frame unify */
.series-row .sr-thumb {
  background: #1a1d21;
}
.scenario-card .sc-media.media-interim {
  background: #1a1d21;
}
.app-case-media.media-interim {
  background: #1a1d21;
}
.media-interim-badge {
  max-width: calc(100% - 1.3rem);
}