/* ==========================================================================
   MSDD ENGINE — Diesel power solutions B2B site
   Design system: "the nameplate" — industrial spec-plate vernacular
   --------------------------------------------------------------------------
   Tokens
   --ink / --paper / --steel / --signal / --blue / --text / --muted / --line
   Type: Barlow Condensed (display) · Barlow (body) · IBM Plex Mono (data)
   ========================================================================== */

:root {
  /* palette */
  --ink:        #14151a;
  --ink-2:      #1d1f26;
  --ink-3:      #262933;
  --paper:      #f6f5f1;
  --paper-2:    #ffffff;
  --steel:      #e5e4de;
  --steel-2:    #c9c8c0;
  --signal:     #f5a800;
  --signal-deep:#d28e00;
  --blue:       #23537e;
  --blue-deep:  #1a3f60;
  --text:       #26272c;
  --muted:      #676a71;
  --line:       rgba(20, 21, 26, 0.10);
  --line-strong:rgba(20, 21, 26, 0.22);
  --line-ink:   rgba(255, 255, 255, 0.12);

  /* type */
  --font-display: "Barlow Condensed", "Arial Narrow", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-body:    "Barlow", "Segoe UI", system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono:    "IBM Plex Mono", "SFMono-Regular", Consolas, "PingFang SC", "Microsoft YaHei", monospace;

  /* scale */
  --fs-hero:    clamp(3rem, 8.2vw, 6.4rem);
  --fs-h1:      clamp(2.3rem, 5vw, 4rem);
  --fs-h2:      clamp(1.85rem, 3.6vw, 2.9rem);
  --fs-h3:      1.32rem;
  --fs-body:    1.03rem;
  --fs-small:   0.9rem;

  --wrap: 1240px;
  --radius: 8px;
  --shadow: 0 1px 2px rgba(20, 21, 26, 0.05), 0 8px 24px rgba(20, 21, 26, 0.06);
  --shadow-lg: 0 18px 50px rgba(20, 21, 26, 0.14);
}

/* ---------------------------- reset ------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.6;
  color: var(--text);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
ul, ol { padding: 0; list-style: none; }
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.04;
  letter-spacing: -0.015em;
  text-transform: none;
  color: var(--ink);
}
strong { font-weight: 600; }
::selection { background: var(--signal); color: var(--ink); }

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

/* ---------------------------- layout ------------------------------------ */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 40px);
}
.section { padding-block: clamp(56px, 7vw, 88px); }
.section--tight { padding-block: clamp(40px, 6vw, 64px); }
.section--ink { background: var(--ink); color: #e8e9ec; }
.section--ink h2, .section--ink h3, .section--ink h4 { color: #fff; }
.section--white { background: var(--paper-2); }

/* eyebrow + section head */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--signal-deep);
  margin-bottom: 14px;
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 3px;
  background: var(--signal);
}
.section-head { max-width: 760px; margin-bottom: clamp(28px, 4vw, 44px); }
.section-head h2 { max-width: 18ch; }
.section-head p { color: var(--muted); margin-top: 14px; font-size: 1.03rem; max-width: 66ch; }
.section-head--center { margin-inline: auto; text-align: center; }
.section-head--center .eyebrow::before { display: none; }

/* hazard divider — used sparingly as a signature accent */
.hazard {
  height: 6px;
  background: repeating-linear-gradient(
    -45deg,
    var(--signal) 0 14px,
    var(--ink) 14px 28px
  );
}

/* ---------------------------- topbar ------------------------------------ */
.topbar {
  background: var(--ink);
  color: #b9bcc4;
  font-size: 0.82rem;
  border-bottom: 1px solid var(--line-ink);
}
.topbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 38px;
  padding-block: 6px;
}
.topbar__meta { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; }
.topbar__item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: #b9bcc4;
  transition: color 0.15s;
}
.topbar__item:hover { color: #fff; }
.topbar__item svg { width: 13px; height: 13px; flex: none; }
.topbar__item svg * { stroke: var(--signal); }
.topbar__note {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #8f939c;
  white-space: nowrap;
}

/* ---------------------------- header / nav ------------------------------ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(246, 245, 241, 0.94);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-header__inner {
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: 68px;
}
.brand { display: inline-flex; align-items: center; gap: 12px; }
.brand__mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  background: var(--ink);
  color: var(--signal);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.5rem;
  letter-spacing: 0;
  border-radius: var(--radius);
}
.brand__mark::before { content: "M"; line-height: 1; }
.brand__word {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: 0.04em;
  color: var(--ink);
  line-height: 0.95;
  display: flex;
  flex-direction: column;
}
.brand__sub {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.6rem;
  letter-spacing: 0.42em;
  color: var(--muted);
}
.nav { display: flex; align-items: center; gap: 2px; margin-left: auto; }
.nav__link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 9px 11px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--ink);
  border-radius: var(--radius);
  transition: background 0.15s, color 0.15s;
}
.nav__link:hover { background: var(--steel); }
.nav__link.is-active { color: var(--signal-deep); }
.nav__link .chev { width: 10px; height: 10px; transition: transform 0.2s; }
.nav__group { position: relative; }
.nav__group.open .nav__link--drop .chev { transform: rotate(180deg); }

.dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 232px;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 8px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: opacity 0.18s, transform 0.18s, visibility 0.18s;
}
.nav__group.open .dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 12px;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--ink);
  border-radius: var(--radius);
}
.dropdown a:hover { background: var(--paper); color: var(--signal-deep); }
.dropdown a small {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 0.7rem;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.site-header__cta { display: flex; align-items: center; gap: 12px; }
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}
.lang-switch {
  display: inline-flex;
  align-items: center;
  padding: 9px 15px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--ink);
  letter-spacing: 0.02em;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
}
.lang-switch:hover { border-color: var(--ink); background: var(--steel); }
.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--ink);
  transition: transform 0.2s, opacity 0.2s;
}
.nav-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------------------------- buttons ----------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 13px 22px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: background 0.16s, color 0.16s, border-color 0.16s, transform 0.16s;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn svg { width: 15px; height: 15px; }
.btn--signal { background: var(--signal); color: var(--ink); }
.btn--signal:hover { background: var(--signal-deep); color: #fff; }
.btn--ink { background: var(--ink); color: #fff; }
.btn--ink:hover { background: var(--ink-3); }
.btn--ghost { border-color: var(--line-strong); color: var(--ink); }
.btn--ghost:hover { border-color: var(--ink); }
.btn--ghost-on-dark { border-color: var(--line-ink); color: #fff; }
.btn--ghost-on-dark:hover { border-color: var(--signal); color: var(--signal); }
.btn--lg { padding: 16px 28px; font-size: 1.02rem; }
.btn--block { width: 100%; }

/* ---------------------------- hero -------------------------------------- */
.hero {
  position: relative;
  background: var(--ink);
  color: #e8e9ec;
  overflow: hidden;
}
.hero__grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse at 75% 40%, black 30%, transparent 75%);
}
.hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(36px, 6vw, 72px);
  align-items: center;
  padding-block: clamp(64px, 10vw, 120px);
}
.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--signal);
  margin-bottom: 22px;
}
.hero__eyebrow .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--signal); }
.hero h1 {
  font-size: var(--fs-hero);
  color: #fff;
  text-wrap: balance;
  letter-spacing: 0;
}
.page-home .hero h1 {
  font-size: clamp(2.4rem, 5.8vw, 4.5rem);
  line-height: 1.02;
}
.hero h1 .accent { color: var(--signal); }

.hero__lede {
  margin-top: 22px;
  max-width: 620px;
  font-size: 1.16rem;
  color: #b9bcc4;
}
.hero__cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 32px; }
.hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin-top: 40px;
  border-top: 1px solid var(--line-ink);
}
.hero__stat {
  flex: 1 1 140px;
  padding: 20px 24px 0 0;
  border-right: 1px solid var(--line-ink);
  margin-right: 24px;
}
.hero__stat:last-child { border-right: 0; margin-right: 0; }
.hero__stat b {
  display: block;
  font-family: var(--font-display);
  font-size: 1.9rem;
  font-weight: 700;
  color: #fff;
  line-height: 1;
}
.hero__stat b em { font-style: normal; color: var(--signal); }
.hero__stat span {
  display: block;
  margin-top: 6px;
  font-size: 0.82rem;
  color: #8f939c;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* nameplate — signature component */
.plate {
  position: relative;
  background: linear-gradient(160deg, #23252d, #191b21);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 6px;
  padding: 30px 28px 24px;
  box-shadow: var(--shadow-lg);
}
.plate::after {
  content: "";
  position: absolute;
  inset: 7px;
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 4px;
  pointer-events: none;
}
.plate__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  border-bottom: 1px solid var(--line-ink);
  padding-bottom: 16px;
  margin-bottom: 8px;
}
.plate__brand {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  color: var(--signal);
  text-transform: uppercase;
}
.plate__id {
  font-family: var(--font-display);
  font-size: 2.1rem;
  font-weight: 700;
  color: #fff;
  line-height: 1;
}
.plate__specs { display: flex; flex-direction: column; }
.plate__row {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 12px 0;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.12);
}
.plate__row dt {
  font-size: 0.82rem;
  color: #8f939c;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.plate__row dd {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  font-weight: 500;
  color: #fff;
  text-align: right;
}
.plate__caption {
  margin-top: 16px;
  font-size: 0.76rem;
  color: #6f737c;
  font-style: normal;
}
.plate__screw {
  position: absolute;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #3a3d46;
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.5);
}
.plate__screw::after {
  content: "";
  position: absolute;
  left: 2px;
  right: 2px;
  top: 4px;
  height: 1px;
  background: rgba(0, 0, 0, 0.7);
  transform: rotate(45deg);
}
.plate__screw--tl { top: 9px; left: 9px; }
.plate__screw--tr { top: 9px; right: 9px; }
.plate__screw--bl { bottom: 9px; left: 9px; }
.plate__screw--br { bottom: 9px; right: 9px; }

/* ---------------------------- generic components ------------------------ */
.card-grid { display: grid; gap: 20px; }
.card-grid--3 { grid-template-columns: repeat(3, 1fr); }
.card-grid--2 { grid-template-columns: repeat(2, 1fr); }
.card-grid--4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.18s, box-shadow 0.18s, border-color 0.18s;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: var(--steel-2); }

.card__media {
  position: relative;
  background: var(--ink);
  aspect-ratio: 4 / 3;
  display: grid;
  place-items: center;
  overflow: hidden;
}
.card__media img { width: 82%; height: 82%; object-fit: contain; }
.card__body { padding: 22px; }
.card__body h3 { font-size: 1.3rem; margin-bottom: 9px; }
.card__body p { color: var(--muted); font-size: 0.96rem; line-height: 1.58; }
.card__body .link-more { margin-top: 16px; }

.tag {
  display: inline-block;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border: 1px solid var(--line-strong);
  border-radius: 100px;
  color: var(--muted);
}
.tag--signal { border-color: transparent; background: rgba(245, 168, 0, 0.14); color: var(--signal-deep); }

.link-more {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--ink);
  border-bottom: 2px solid var(--signal);
  padding-bottom: 2px;
  transition: color 0.15s, border-color 0.15s;
}
.link-more:hover { color: var(--signal-deep); border-color: var(--signal-deep); }
.link-more svg { width: 13px; height: 13px; }

/* brand strip */
.brand-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--paper-2);
}
.brand-strip__cell { padding: 26px 24px; border-right: 1px solid var(--line); }
.brand-strip__cell:last-child { border-right: 0; }
.brand-strip__name {
  font-family: var(--font-display);
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--ink);
  text-transform: uppercase;
}
.brand-strip__cell small {
  display: block;
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--muted);
  letter-spacing: 0.06em;
}
.brand-strip__cell p { margin-top: 10px; font-size: 0.93rem; color: var(--muted); }

/* parts lookup */
.lookup {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: clamp(28px, 5vw, 64px);
  align-items: center;
}
.lookup__panel {
  background: var(--ink);
  border-radius: var(--radius);
  padding: clamp(24px, 4vw, 40px);
  color: #e8e9ec;
  box-shadow: var(--shadow-lg);
}
.lookup__panel h3 { color: #fff; font-size: 1.7rem; margin-bottom: 8px; }
.lookup__panel > p { color: #a9acb4; font-size: 0.96rem; margin-bottom: 20px; }
.lookup__field { margin-bottom: 13px; }
.lookup__field label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #8f939c;
  margin-bottom: 6px;
}
.lookup__field input, .lookup__field textarea {
  width: 100%;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--line-ink);
  border-radius: var(--radius);
  color: #fff;
  padding: 12px 14px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
}
.lookup__field input::placeholder, .lookup__field textarea::placeholder { color: #5d616b; }
.lookup__field input:focus, .lookup__field textarea:focus {
  outline: none;
  border-color: var(--signal);
}

/* why-us list */
.why-list { display: flex; flex-direction: column; }
.why-list li {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}
.why-list li:first-child { padding-top: 0; }
.why-list li:last-child { border-bottom: 0; padding-bottom: 0; }
.why-list .idx {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--signal-deep);
  font-weight: 600;
  padding-top: 3px;
}
.why-list h4 { font-size: 1.15rem; letter-spacing: 0.01em; text-transform: none; margin-bottom: 5px; }
.why-list p { color: var(--muted); font-size: 0.96rem; }

/* article cards */
.article-card .card__media { aspect-ratio: 16 / 9; background: var(--ink-2); }
.article-card .card__meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 10px;
}

/* FAQ */
.faq { max-width: 820px; }
.faq details {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-2);
  margin-bottom: 12px;
  overflow: hidden;
}
.faq summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 22px;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
  color: var(--ink);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.3rem;
  color: var(--signal-deep);
  transition: transform 0.2s;
  flex: none;
}
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details[open] summary { border-bottom: 1px solid var(--line); }
.faq .faq__a { padding: 18px 22px; color: var(--muted); font-size: 0.97rem; }

/* ---------------------------- page hero (inner) ------------------------- */
.page-hero {
  background: var(--ink);
  color: #e8e9ec;
  position: relative;
  overflow: hidden;
}
.page-hero .hero__grid-bg { display: block; }
.page-hero__inner { position: relative; padding-block: clamp(48px, 7vw, 80px); }
.page-hero h1 { color: #fff; font-size: var(--fs-h1); max-width: 900px; }
.page-hero p { margin-top: 16px; max-width: 720px; color: #b9bcc4; font-size: 1.08rem; }

/* breadcrumb */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.03em;
  color: var(--muted);
  padding-block: 18px;
}
.crumbs a { color: var(--muted); }
.crumbs a:hover { color: var(--signal-deep); }
.crumbs .sep { color: var(--steel-2); }
.crumbs .here { color: var(--ink); font-weight: 500; }

/* ---------------------------- product cards / lists --------------------- */
.pcard {
  display: flex;
  flex-direction: column;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.18s, box-shadow 0.18s, border-color 0.18s;
}
.pcard:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: var(--steel-2); }
.pcard__media { background: var(--ink); aspect-ratio: 4 / 3; display: grid; place-items: center; }
.pcard__media img { width: 80%; height: 80%; object-fit: contain; }
.pcard__body { padding: 20px; display: flex; flex-direction: column; gap: 10px; flex: 1; min-height: 218px; }
.pcard__brand {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--signal-deep);
}
.pcard__name { font-size: 1.28rem; line-height: 1.05; }
.pcard__spec {
  display: flex;
  flex-direction: column;
  gap: 5px;
  margin: 2px 0 8px;
}
.pcard__spec span {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.86rem;
  color: var(--muted);
  padding-bottom: 5px;
  border-bottom: 1px dashed var(--line);
}
.pcard__spec span b { font-family: var(--font-mono); font-weight: 500; color: var(--text); }
.pcard__foot { margin-top: auto; display: flex; gap: 10px; }
.pcard__foot .btn { flex: 1; padding: 11px 14px; font-size: 0.88rem; }

/* layout with filter sidebar */
.cat-layout { display: grid; grid-template-columns: 260px 1fr; gap: 32px; align-items: start; }
.filters {
  position: sticky;
  top: 92px;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
}
.filters h3 { font-size: 1.05rem; margin-bottom: 16px; letter-spacing: 0.02em; }
.filter-group { margin-bottom: 18px; }
.filter-group:last-child { margin-bottom: 0; }
.filter-group > span {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 9px;
}
.filter-group label {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 5px 0;
  font-size: 0.92rem;
  color: var(--text);
  cursor: pointer;
}
.filter-group input[type="checkbox"] { accent-color: var(--signal); width: 15px; height: 15px; }
.product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }

/* ---------------------------- detail page ------------------------------- */
.detail-layout { display: grid; grid-template-columns: minmax(0, 1fr) 360px; gap: 40px; align-items: start; }
.detail-main { min-width: 0; }
.detail-title-row { display: flex; flex-wrap: wrap; align-items: baseline; gap: 14px; margin-bottom: 4px; }
.detail-title-row h1 { font-size: var(--fs-h1); }
.detail-title-row .pnum { font-family: var(--font-mono); font-size: 0.95rem; color: var(--muted); }

.spec-table { width: 100%; border-collapse: collapse; }
.spec-table th, .spec-table td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  font-size: 0.95rem;
  vertical-align: top;
}
.spec-table th {
  width: 40%;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}
.spec-table td { font-family: var(--font-mono); font-size: 0.9rem; color: var(--text); }
.spec-table tr:last-child th, .spec-table tr:last-child td { border-bottom: 0; }

.detail-gallery {
  background: var(--ink);
  border-radius: var(--radius);
  aspect-ratio: 4 / 3;
  display: grid;
  place-items: center;
  margin-bottom: 18px;
}
.detail-gallery img { width: 78%; height: 78%; object-fit: contain; }

.quote-panel {
  position: sticky;
  top: 92px;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}
.quote-panel h3 { font-size: 1.35rem; margin-bottom: 4px; }
.quote-panel > p { font-size: 0.9rem; color: var(--muted); margin-bottom: 16px; }
.quote-panel .field { margin-bottom: 12px; }
.quote-panel .field label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 5px;
}
.quote-panel .field input, .quote-panel .field select, .quote-panel .field textarea {
  width: 100%;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 11px 12px;
  font-size: 0.94rem;
  background: var(--paper-2);
  color: var(--text);
}
.quote-panel .field input:focus, .quote-panel .field select:focus, .quote-panel .field textarea:focus {
  outline: none;
  border-color: var(--signal);
}

/* ---------------------------- RFQ / contact ----------------------------- */
.rfq-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: clamp(28px, 5vw, 56px); align-items: start; }
.form-card {
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(24px, 4vw, 36px);
}
.form-card h2 { font-size: 1.6rem; margin-bottom: 6px; }
.form-card > p { color: var(--muted); margin-bottom: 24px; }
.field { margin-bottom: 15px; }
.field label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 6px;
}
.field label em { color: var(--signal-deep); font-style: normal; }
.field input, .field select, .field textarea {
  width: 100%;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 12px 14px;
  font-size: 0.96rem;
  background: var(--paper-2);
  color: var(--text);
}
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--signal); }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.field-row--3 { grid-template-columns: repeat(3, 1fr); }

.seg {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 20px;
}
.seg button {
  padding: 12px 10px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--muted);
  transition: all 0.15s;
}
.seg button.is-active { background: var(--ink); color: #fff; border-color: var(--ink); }

.form-note {
  display: none;
  background: rgba(245, 168, 0, 0.12);
  border: 1px solid rgba(245, 168, 0, 0.5);
  color: #7a5a00;
  border-radius: var(--radius);
  padding: 14px 16px;
  font-size: 0.92rem;
  margin-top: 16px;
}
.form-note.is-visible { display: block; }

.contact-list { display: flex; flex-direction: column; }
.contact-list li { display: flex; gap: 14px; padding: 16px 0; border-bottom: 1px solid var(--line); }
.contact-list .ico {
  flex: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--signal);
  display: grid;
  place-items: center;
}
.contact-list .ico svg { width: 18px; height: 18px; }
.contact-list h4 { font-size: 1rem; letter-spacing: 0.02em; margin-bottom: 3px; text-transform: none; }
.contact-list p, .contact-list a { color: var(--muted); font-size: 0.94rem; word-break: break-word; }
.contact-list a:hover { color: var(--signal-deep); }

/* process steps */
.steps { counter-reset: step; display: grid; gap: 0; }
.steps li {
  position: relative;
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}
.steps li::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--signal-deep);
  font-weight: 600;
  padding-top: 2px;
}
.steps h4 { font-size: 1.08rem; text-transform: none; margin-bottom: 4px; }
.steps p { color: var(--muted); font-size: 0.94rem; }

/* ---------------------------- footer ------------------------------------ */
.site-footer { background: var(--ink); color: #a9acb4; font-size: 0.94rem; }
.site-footer__top { padding-block: clamp(48px, 6vw, 72px); }
.footer__grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 40px; }
.footer__brand p { margin-top: 16px; max-width: 300px; color: #8f939c; }
.footer__col h4 {
  color: #fff;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}
.footer__col a, .footer__col span {
  display: block;
  padding: 5px 0;
  color: #a9acb4;
}
.footer__col a:hover { color: var(--signal); }
.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: space-between;
  border-top: 1px solid var(--line-ink);
  padding-block: 22px;
  font-size: 0.82rem;
  color: #6f737c;
}
.footer__note { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.02em; }

/* ---------------------------- reveal / motion --------------------------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  * { animation: none !important; }
}

/* sticky quote button */
.sticky-quote {
  position: fixed;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%) translateY(80px);
  z-index: 70;
  opacity: 0;
  pointer-events: none;
  transition: transform 0.3s, opacity 0.3s;
}
.sticky-quote.is-visible { transform: translateX(-50%) translateY(0); opacity: 1; pointer-events: auto; }
.sticky-quote .btn { box-shadow: 0 12px 30px rgba(0, 0, 0, 0.35); }

/* ---------------------------- quote modal ------------------------------- */
.modal {
  position: fixed;
  inset: 0;
  z-index: 110;
  display: grid;
  place-items: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.22s, visibility 0.22s;
}
.modal.is-open { opacity: 1; visibility: visible; }
.modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(20, 21, 26, 0.62);
  backdrop-filter: blur(3px);
}
.modal__dialog {
  position: relative;
  width: min(540px, 100%);
  max-height: 88vh;
  overflow-y: auto;
  background: var(--paper-2);
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
  padding: 30px 28px 24px;
  transform: translateY(14px);
  transition: transform 0.22s;
}
.modal.is-open .modal__dialog { transform: none; }
.modal__close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: var(--muted);
}
.modal__close:hover { background: var(--steel); color: var(--ink); }
.modal__title { font-size: 1.6rem; margin-bottom: 6px; padding-right: 34px; }
.modal__sub { color: var(--muted); font-size: 0.94rem; margin-bottom: 20px; }
.modal__product {
  display: none;
  margin: -8px 0 16px;
  padding: 10px 14px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text);
}
.modal__full {
  display: block;
  margin-top: 14px;
  text-align: center;
  font-size: 0.88rem;
  color: var(--signal-deep);
  font-weight: 600;
}
.modal__full:hover { text-decoration: underline; }
@media (prefers-reduced-motion: reduce) {
  .modal, .modal__dialog { transition: none; }
}

/* ---------------------------- floating side tools ----------------------- */
.side-tools {
  position: fixed;
  right: 16px;
  bottom: 20px;
  z-index: 80;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.side-tools a, .side-tools button {
  position: relative;
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: var(--ink);
  color: #fff;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.18);
  transition: transform 0.15s, background 0.15s, opacity 0.25s, visibility 0.25s;
}
.side-tools svg { width: 20px; height: 20px; flex: none; }
.side-tools a:hover, .side-tools button:hover { transform: translateY(-2px); background: var(--ink-3); }
.side-tools .st-wa { background: #25D366; }
.side-tools .st-wa:hover { background: #1fb457; }
.side-tools .st-tg { background: linear-gradient(145deg, #2aabee, #1f8fcb); }
.side-tools .st-tg svg { width: 21px; height: 21px; }
.side-tools .st-tg:hover { background: #168bc4; }
.side-tools .st-msg { background: var(--signal); color: var(--ink); }
.side-tools .st-msg:hover { background: var(--signal-deep); color: #fff; }
.side-tools .st-top {
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
}
.side-tools .st-top.is-visible { opacity: 1; visibility: visible; transform: none; }
.st-tip {
  position: absolute;
  right: calc(100% + 12px);
  top: 50%;
  transform: translateY(-50%);
  white-space: nowrap;
  background: var(--ink);
  color: #fff;
  font-size: 0.8rem;
  padding: 6px 12px;
  border-radius: var(--radius);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.15s, visibility 0.15s;
  pointer-events: none;
}
.st-tip::after {
  content: "";
  position: absolute;
  left: 100%;
  top: 50%;
  transform: translateY(-50%);
  border: 5px solid transparent;
  border-left-color: var(--ink);
}
.side-tools a:hover .st-tip, .side-tools button:hover .st-tip { opacity: 1; visibility: visible; }

/* side message panel */
.side-msg-panel {
  position: fixed;
  right: 80px;
  bottom: 20px;
  width: min(360px, calc(100vw - 32px));
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
  padding: 22px;
  z-index: 85;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.2s, transform 0.2s, visibility 0.2s;
}
.side-msg-panel.is-open { opacity: 1; visibility: visible; transform: none; }
.side-msg-panel h4 { font-size: 1.15rem; margin-bottom: 4px; }
.side-msg-panel > p { font-size: 0.88rem; color: var(--muted); margin-bottom: 16px; }
.side-msg-panel .field { margin-bottom: 10px; }
.side-msg-panel .field input, .side-msg-panel .field textarea {
  width: 100%;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 10px 12px;
  font-size: 0.92rem;
  background: var(--paper-2);
}
.side-msg-panel .field input:focus, .side-msg-panel .field textarea:focus { outline: none; border-color: var(--signal); }
.side-msg-panel .msg-close {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: var(--muted);
}
.side-msg-panel .msg-close:hover { background: var(--steel); color: var(--ink); }
.side-msg-panel .msg-full {
  display: block;
  margin-top: 12px;
  font-size: 0.85rem;
  color: var(--signal-deep);
  font-weight: 600;
  text-align: center;
}
.side-msg-panel .msg-full:hover { text-decoration: underline; }

@media (max-width: 560px) {
  .side-tools { right: 12px; bottom: 12px; }
  .side-tools a, .side-tools button { width: 44px; height: 44px; border-radius: 13px; }
  .side-msg-panel { right: 60px; }
}

/* ---------------------------- responsive -------------------------------- */
@media (max-width: 1024px) {
  .card-grid--4 { grid-template-columns: repeat(2, 1fr); }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .detail-layout { grid-template-columns: 1fr; }
  .quote-panel { position: static; }
  .cat-layout { grid-template-columns: 1fr; }
  .filters { position: static; }
}

@media (max-width: 900px) {
  .hero__inner { grid-template-columns: 1fr; }
  .hero__stats { margin-top: 28px; }
  .brand-strip { grid-template-columns: 1fr; }
  .brand-strip__cell { border-right: 0; border-bottom: 1px solid var(--line); }
  .brand-strip__cell:last-child { border-bottom: 0; }
  .lookup { grid-template-columns: 1fr; }
  .card-grid--3 { grid-template-columns: 1fr 1fr; }
  .rfq-grid { grid-template-columns: 1fr; }
}

@media (max-width: 780px) {
  .topbar__note { display: none; }
  .topbar__meta { gap: 14px; }
  .nav-toggle { display: flex; }
  .nav {
    position: fixed;
    inset: 0;
    top: 72px;
    background: var(--paper);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 20px clamp(20px, 4vw, 40px) 40px;
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform 0.28s ease;
    z-index: 55;
  }
  .nav.is-open { transform: translateX(0); }
  .nav__link { padding: 14px 6px; font-size: 1.1rem; border-bottom: 1px solid var(--line); border-radius: 0; }
  .dropdown {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: 0;
    background: transparent;
    padding: 0 0 0 14px;
    display: none;
  }
  .nav__group.open .dropdown { display: block; }
  .site-header__cta .btn { display: none; }
}

@media (max-width: 560px) {
  .card-grid--3, .card-grid--2, .card-grid--4, .product-grid { grid-template-columns: 1fr; }
  .field-row, .field-row--3 { grid-template-columns: 1fr; }
  .seg { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr; gap: 28px; }
  .plate { padding: 22px 20px 18px; }
  .plate__row { flex-direction: column; gap: 3px; }
  .plate__row dd { text-align: left; }
}