/* ==========================================================================
   XDM - Suzhou XDM 3D Printing Technology Co., Ltd.
   Global stylesheet | Metal PBLM / SLM industrial 3D printing
   ========================================================================== */

/* ---------- Design tokens ---------- */
:root {
  --ink-900: #06090f;
  --ink-800: #0b1220;
  --ink-700: #111b2e;
  --ink-600: #1a2740;
  --steel-500: #64748b;
  --steel-400: #94a3b8;
  --steel-200: #d7dee8;
  --steel-100: #eef2f7;
  --paper: #ffffff;
  --paper-soft: #f7f9fc;
  --accent: #00b3c6;
  --accent-dark: #00808f;
  --accent-soft: rgba(0, 179, 198, 0.12);
  --gold: #c8a26a;

  --font-sans: "Inter", "Helvetica Neue", Helvetica, Arial, "Segoe UI", Roboto, sans-serif;

  --radius-sm: 6px;
  --radius: 14px;
  --radius-lg: 26px;

  --shadow-sm: 0 1px 2px rgba(9, 17, 30, 0.06), 0 6px 18px rgba(9, 17, 30, 0.05);
  --shadow-md: 0 18px 48px rgba(9, 17, 30, 0.10);
  --shadow-lg: 0 32px 80px rgba(9, 17, 30, 0.18);

  --container: 1220px;
  --header-h: 84px;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 12px);
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16.5px;
  line-height: 1.72;
  color: var(--ink-700);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img, svg, video { max-width: 100%; display: block; height: auto; }
a { color: var(--accent-dark); text-decoration: none; transition: color .25s var(--ease); }
a:hover { color: var(--accent); }
ul, ol { margin: 0; padding: 0; list-style: none; }
p { margin: 0 0 1.05em; }
button, input, textarea, select { font: inherit; color: inherit; }

h1, h2, h3, h4, h5 {
  margin: 0 0 .6em;
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.015em;
  color: var(--ink-900);
  text-wrap: balance;
}

h1 { font-size: clamp(2.1rem, 1.3rem + 3.4vw, 3.9rem); }
h2 { font-size: clamp(1.6rem, 1.15rem + 1.9vw, 2.65rem); }
h3 { font-size: clamp(1.2rem, 1.05rem + .6vw, 1.5rem); }
h4 { font-size: 1.06rem; }

::selection { background: var(--accent); color: #fff; }

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- Layout helpers ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 22px;
}
.container-narrow { max-width: 900px; }
.section { padding-block: clamp(58px, 7vw, 108px); }
.section--soft { background: var(--paper-soft); }
.section--dark { background: var(--ink-800); color: var(--steel-200); }
.section--dark h2, .section--dark h3, .section--dark h4 { color: #fff; }
.section--tight { padding-block: clamp(40px, 4.5vw, 64px); }

.grid { display: grid; gap: 26px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.skip-link {
  position: absolute;
  left: 12px; top: -60px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--accent);
  color: #fff;
  border-radius: 0 0 8px 8px;
  transition: top .2s;
}
.skip-link:focus { top: 0; color: #fff; }

/* ---------- Eyebrow / titles ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--accent-dark);
}
.eyebrow::before {
  content: "";
  width: 30px; height: 2px;
  background: var(--accent);
}
.section--dark .eyebrow { color: #5fe3ef; }

.section-head { max-width: 780px; margin-bottom: clamp(32px, 4vw, 56px); }
.section-head.is-center { margin-inline: auto; text-align: center; }
.section-head.is-center .eyebrow { justify-content: center; }
.section-head p { color: var(--steel-500); font-size: 1.03rem; margin-bottom: 0; }
.section--dark .section-head p { color: var(--steel-400); }

.lead { font-size: clamp(1.02rem, .95rem + .3vw, 1.16rem); color: #334a66; }
.section--dark .lead { color: var(--steel-200); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 15px 30px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: .95rem;
  font-weight: 600;
  letter-spacing: .01em;
  text-align: center;
  cursor: pointer;
  transition: transform .25s var(--ease), background .25s var(--ease), color .25s var(--ease), box-shadow .25s var(--ease), border-color .25s var(--ease);
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  background: linear-gradient(120deg, var(--accent) 0%, #0095a6 100%);
  color: #fff;
  box-shadow: 0 12px 30px rgba(0, 128, 143, .28);
}
.btn--primary:hover { color: #fff; background: linear-gradient(120deg, #12c6d9 0%, var(--accent-dark) 100%); box-shadow: 0 16px 38px rgba(0, 128, 143, .34); }

.btn--ghost { border-color: rgba(255,255,255,.45); color: #fff; }
.btn--ghost:hover { background: rgba(255,255,255,.10); color: #fff; border-color: #fff; }

.btn--dark { background: var(--ink-800); color: #fff; }
.btn--dark:hover { color: #fff; background: var(--ink-700); }

.btn--outline { border-color: var(--steel-200); color: var(--ink-700); background: #fff; }
.btn--outline:hover { border-color: var(--accent); color: var(--accent-dark); }

.btn--sm { padding: 11px 22px; font-size: .86rem; }

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: .93rem;
}
.link-arrow::after {
  content: "\2192";
  transition: transform .25s var(--ease);
}
.link-arrow:hover::after { transform: translateX(5px); }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,.92);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid rgba(15, 27, 46, .08);
  transition: box-shadow .3s var(--ease), background .3s var(--ease);
}
.site-header.is-scrolled { box-shadow: 0 10px 30px rgba(9, 17, 30, .07); }

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: var(--header-h);
}

.brand { display: inline-flex; align-items: center; gap: 12px; flex: 0 0 auto; height: 64px; }
.brand img { width: 132px; height: 74px; object-fit: contain; object-position: left center; }

.nav { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.nav a {
  position: relative;
  padding: 10px 15px;
  border-radius: 8px;
  font-size: .93rem;
  font-weight: 600;
  color: #2c3a4f;
  white-space: nowrap;
}
.nav a::after {
  content: "";
  position: absolute;
  left: 15px; right: 15px; bottom: 4px;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .28s var(--ease);
}
.nav a:hover { color: var(--ink-900); }
.nav a:hover::after,
.nav a[aria-current="page"]::after { transform: scaleX(1); }
.nav a[aria-current="page"] { color: var(--ink-900); }

.header-cta { margin-left: 10px; }

.nav-toggle {
  display: none;
  width: 46px; height: 46px;
  padding: 0;
  border: 1px solid var(--steel-200);
  border-radius: 10px;
  background: #fff;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}
.nav-toggle span {
  position: relative;
  display: block;
  width: 20px; height: 2px;
  background: var(--ink-800);
  transition: background .2s;
}
.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 20px; height: 2px;
  background: var(--ink-800);
  transition: transform .28s var(--ease), top .28s var(--ease);
}
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after { top: 6px; }
.nav-toggle[aria-expanded="true"] span { background: transparent; }
.nav-toggle[aria-expanded="true"] span::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] span::after { top: 0; transform: rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  isolation: isolate;
  background: var(--ink-900);
  color: #e8eef7;
  overflow: hidden;
}
.hero__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  z-index: -2;
  opacity: .5;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(900px 420px at 12% 18%, rgba(0,179,198,.30), transparent 65%),
    linear-gradient(180deg, rgba(4,8,15,.86) 0%, rgba(6,11,20,.78) 45%, rgba(6,11,20,.94) 100%);
}
.hero__inner {
  max-width: 880px;
  padding-block: clamp(74px, 9vw, 132px);
}
.hero h1 { color: #fff; margin-bottom: 22px; }
.hero h1 em { font-style: normal; color: #4fdfec; }
.hero__lead {
  font-size: clamp(1.02rem, .94rem + .42vw, 1.24rem);
  color: #c3d0e0;
  max-width: 720px;
  margin-bottom: 34px;
}
.hero__actions { display: flex; flex-wrap: wrap; gap: 14px; }

.hero__stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  margin-top: clamp(48px, 6vw, 76px);
  padding-top: 34px;
  border-top: 1px solid rgba(255,255,255,.14);
}
.hero__stat b {
  display: block;
  font-size: clamp(1.5rem, 1.1rem + 1.3vw, 2.15rem);
  font-weight: 700;
  color: #fff;
  letter-spacing: -.02em;
  line-height: 1.1;
}
.hero__stat span {
  display: block;
  margin-top: 8px;
  font-size: .82rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: #97a9bd;
}

/* ---------- Page hero (inner pages) ---------- */
.page-hero {
  position: relative;
  isolation: isolate;
  background: var(--ink-800);
  color: #dfe8f3;
  padding-block: clamp(54px, 6.5vw, 96px);
  overflow: hidden;
}
.page-hero img.page-hero__bg {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  opacity: .32;
  z-index: -2;
}
.page-hero::after {
  content: "";
  position: absolute; inset: 0;
  z-index: -1;
  background: linear-gradient(100deg, rgba(6,11,20,.94) 0%, rgba(6,11,20,.7) 55%, rgba(6,11,20,.5) 100%);
}
.page-hero h1 { color: #fff; margin-bottom: 16px; max-width: 900px; }
.page-hero p { max-width: 760px; color: #bfcbdb; margin-bottom: 0; }

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 22px;
  font-size: .82rem;
  letter-spacing: .04em;
  color: #93a5bb;
}
.breadcrumb a { color: #cdd9e8; }
.breadcrumb a:hover { color: #fff; }
.breadcrumb li::after { content: "/"; margin-left: 8px; color: #5c6f87; }
.breadcrumb li:last-child::after { content: none; }

/* ---------- Cards ---------- */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 32px 30px;
  background: #fff;
  border: 1px solid var(--steel-100);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: transform .35s var(--ease), box-shadow .35s var(--ease), border-color .35s var(--ease);
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: #dbe7f0; }
.card h3 { margin-bottom: 10px; }
.card p:last-child { margin-bottom: 0; }
.card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px; height: 52px;
  margin-bottom: 20px;
  border-radius: 14px;
  background: var(--accent-soft);
  color: var(--accent-dark);
}
.card__icon svg { width: 26px; height: 26px; stroke: currentColor; fill: none; stroke-width: 1.6; }
.card__num {
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--accent-dark);
  margin-bottom: 12px;
}

.card--dark {
  background: var(--ink-700);
  border-color: rgba(255,255,255,.07);
  color: #c9d5e4;
}
.card--dark h3 { color: #fff; }
.card--dark:hover { border-color: rgba(0,179,198,.5); }
.card--dark .card__icon { background: rgba(0,179,198,.16); color: #5fe3ef; }

/* ---------- Feature list ---------- */
.check-list { display: grid; gap: 12px; }
.check-list li {
  position: relative;
  padding-left: 32px;
  color: #3c4f66;
}
.check-list li::before {
  content: "";
  position: absolute;
  left: 0; top: .45em;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--accent-soft);
  box-shadow: inset 0 0 0 1.5px var(--accent);
}
.check-list li::after {
  content: "";
  position: absolute;
  left: 5px; top: .72em;
  width: 6px; height: 3px;
  border-left: 1.6px solid var(--accent-dark);
  border-bottom: 1.6px solid var(--accent-dark);
  transform: rotate(-45deg);
}
.section--dark .check-list li { color: #c6d3e2; }

/* ---------- Split (image + text) ---------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: clamp(32px, 5vw, 72px);
}
.split--rev .split__media { order: 2; }
.split__media {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  background:
    radial-gradient(120% 100% at 50% 0%, #ffffff 0%, #eef3f9 62%, #e3eaf3 100%);
}
.split__media img { width: 100%; height: 100%; min-height: 240px; object-fit: cover; }
.split__media.is-ratio { aspect-ratio: 3 / 2; }
.split__media.is-ratio img { min-height: 0; }
.split__media--plain { box-shadow: none; border-radius: var(--radius); overflow: visible; }

.badge-float {
  position: absolute;
  right: 18px; bottom: 18px;
  padding: 14px 20px;
  border-radius: 12px;
  background: rgba(6, 11, 20, .82);
  backdrop-filter: blur(8px);
  color: #fff;
  font-size: .8rem;
  letter-spacing: .1em;
  text-transform: uppercase;
}
.badge-float b { display: block; font-size: 1.35rem; letter-spacing: -.01em; color: #4fdfec; }

/* ---------- Product cards ---------- */
.product-card {
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 1px solid var(--steel-100);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform .35s var(--ease), box-shadow .35s var(--ease);
}
.product-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.product-card__media {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 4 / 3;
  padding: 22px;
  background:
    radial-gradient(120% 100% at 50% 0%, #ffffff 0%, #eef3f9 62%, #e4ebf4 100%);
  border-bottom: 1px solid var(--steel-100);
}
.product-card__media img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: transform .45s var(--ease);
}
.product-card:hover .product-card__media img { transform: scale(1.045); }
.product-card__tag {
  position: absolute;
  left: 14px; top: 14px;
  padding: 5px 12px;
  border-radius: 999px;
  background: rgba(6,11,20,.82);
  color: #fff;
  font-size: .7rem;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
}
.product-card__body { display: flex; flex-direction: column; flex: 1; padding: 24px 26px 26px; }
.product-card__model {
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--accent-dark);
  margin-bottom: 8px;
}
.product-card h3 { font-size: 1.16rem; margin-bottom: 10px; }
.product-card p { color: var(--steel-500); font-size: .93rem; }
.product-card__specs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 4px 0 20px;
}
.product-card__specs span {
  padding: 5px 11px;
  border-radius: 999px;
  background: var(--paper-soft);
  border: 1px solid var(--steel-100);
  font-size: .76rem;
  color: #465a73;
}
.product-card__foot { margin-top: auto; display: flex; align-items: center; justify-content: space-between; gap: 12px; }

/* ---------- Spec table ---------- */
.spec-table { width: 100%; border-collapse: collapse; font-size: .94rem; }
.spec-table caption { caption-side: top; text-align: left; font-size: .8rem; letter-spacing: .14em; text-transform: uppercase; color: var(--steel-500); padding-bottom: 12px; }
.spec-table th, .spec-table td { padding: 13px 16px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--steel-100); }
.spec-table th {
  width: 34%;
  font-weight: 600;
  color: #33455c;
  background: var(--paper-soft);
  border-right: 1px solid var(--steel-100);
}
.spec-table td { color: #40536b; }
.spec-table tr:last-child th, .spec-table tr:last-child td { border-bottom: 0; }
.spec-table--dark th { background: rgba(255,255,255,.04); color: #dbe5f1; border-color: rgba(255,255,255,.08); }
.spec-table--dark td { color: #b9c7d8; border-color: rgba(255,255,255,.08); }

.table-wrap { overflow-x: auto; border: 1px solid var(--steel-100); border-radius: var(--radius); background: #fff; }

/* ---------- Industry / solution cards ---------- */
.industry-card {
  position: relative;
  display: block;
  padding: 30px 28px;
  border-radius: var(--radius);
  border: 1px solid var(--steel-100);
  background: #fff;
  color: inherit;
  overflow: hidden;
  transition: transform .35s var(--ease), box-shadow .35s var(--ease), border-color .3s;
}
.industry-card::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--accent), transparent);
  opacity: 0;
  transition: opacity .3s;
}
.industry-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); border-color: #dbe7f0; color: inherit; }
.industry-card:hover::before { opacity: 1; }
.industry-card h3 { font-size: 1.1rem; }
.industry-card p { font-size: .92rem; color: var(--steel-500); margin-bottom: 0; }

/* ---------- Showcase gallery (printing services) ---------- */
.gallery { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 20px; }
.part {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--steel-100);
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
  transition: transform .35s var(--ease), box-shadow .35s var(--ease);
}
.part:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
.part__media {
  aspect-ratio: 1 / 1;
  background: radial-gradient(100% 100% at 50% 0%, #ffffff 0%, #eef3f9 70%, #e6edf6 100%);
  display: flex; align-items: center; justify-content: center;
  padding: 14px;
}
.part__media img { width: 100%; height: 100%; object-fit: contain; transition: transform .45s var(--ease); }
.part:hover .part__media img { transform: scale(1.06); }
.part__body { padding: 16px 18px 20px; }
.part__body h4 { margin-bottom: 6px; font-size: .98rem; }
.part__body p { margin: 0; font-size: .82rem; line-height: 1.6; color: var(--steel-500); }
.part__meta {
  display: inline-block;
  margin-bottom: 8px;
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent-dark);
}

/* ---------- Certificates ---------- */
.cert-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 18px; }
.cert {
  position: relative;
  display: block;
  padding: 10px;
  border: 1px solid var(--steel-100);
  border-radius: var(--radius-sm);
  background: #fff;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}
.cert:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.cert img { width: 100%; border-radius: 3px; }
.cert span {
  display: block;
  padding: 10px 4px 4px;
  font-size: .74rem;
  line-height: 1.45;
  color: #4a5d75;
  text-align: center;
}

/* ---------- Stats band ---------- */
.stat-band { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 2px; background: rgba(255,255,255,.08); }
.stat-band > div { background: var(--ink-800); padding: 34px 26px; }
.stat-band b { display: block; font-size: clamp(1.6rem, 1.2rem + 1.4vw, 2.3rem); color: #fff; letter-spacing: -.02em; line-height: 1.1; }
.stat-band span { display: block; margin-top: 8px; font-size: .8rem; letter-spacing: .12em; text-transform: uppercase; color: #8fa2b8; }

/* ---------- Process steps ---------- */
.steps { counter-reset: step; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 24px; }
.step { position: relative; padding-top: 26px; border-top: 2px solid var(--steel-200); }
.step::before {
  counter-increment: step;
  content: "0" counter(step);
  position: absolute;
  top: -16px; left: 0;
  padding-right: 12px;
  background: var(--paper);
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--accent-dark);
}
.section--soft .step::before { background: var(--paper-soft); }
.step h3 { font-size: 1.04rem; margin-bottom: 8px; }
.step p { font-size: .9rem; color: var(--steel-500); margin: 0; }

/* ---------- Accordion / FAQ ---------- */
.faq { display: grid; gap: 14px; }
.faq__item {
  border: 1px solid var(--steel-100);
  border-radius: var(--radius-sm);
  background: #fff;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
.faq__q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  width: 100%;
  padding: 20px 24px;
  border: 0;
  background: none;
  text-align: left;
  font-size: 1.02rem;
  font-weight: 650;
  color: var(--ink-900);
  cursor: pointer;
  line-height: 1.5;
}
.faq__q:hover { color: var(--accent-dark); }
.faq__q .plus {
  position: relative;
  flex: 0 0 auto;
  width: 22px; height: 22px;
  border-radius: 50%;
  border: 1.5px solid var(--steel-200);
  transition: border-color .25s, background .25s, transform .3s var(--ease);
}
.faq__q .plus::before,
.faq__q .plus::after {
  content: "";
  position: absolute;
  left: 50%; top: 50%;
  width: 9px; height: 1.6px;
  background: var(--ink-700);
  transform: translate(-50%, -50%);
  transition: opacity .25s, transform .3s var(--ease);
}
.faq__q .plus::after { transform: translate(-50%, -50%) rotate(90deg); }
.faq__q[aria-expanded="true"] { color: var(--accent-dark); }
.faq__q[aria-expanded="true"] .plus { border-color: var(--accent); background: var(--accent-soft); }
.faq__q[aria-expanded="true"] .plus::after { opacity: 0; }
.faq__a { padding: 0 24px 22px; }
.faq__a p { margin: 0 0 .8em; color: #455a73; }
.faq__a p:last-child { margin-bottom: 0; }
.faq__a ul { display: grid; gap: 8px; margin: 0 0 .8em; }
.faq__a li { position: relative; padding-left: 18px; color: #455a73; }
.faq__a li::before {
  content: ""; position: absolute; left: 2px; top: .72em;
  width: 5px; height: 5px; border-radius: 50%; background: var(--accent);
}
[hidden] { display: none !important; }

/* ---------- Form ---------- */
.form-card {
  padding: clamp(26px, 3.4vw, 46px);
  border-radius: var(--radius-lg);
  background: #fff;
  border: 1px solid var(--steel-100);
  box-shadow: var(--shadow-md);
}
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px 20px; }
.field { display: flex; flex-direction: column; gap: 7px; }
.field--full { grid-column: 1 / -1; }
.field label { font-size: .86rem; font-weight: 650; color: #33455c; }
.field label .req { color: #d9534f; margin-left: 2px; }
.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 13px 15px;
  border: 1px solid var(--steel-200);
  border-radius: 10px;
  background: #fbfcfe;
  font-size: .95rem;
  transition: border-color .22s, box-shadow .22s, background .22s;
}
.field textarea { min-height: 148px; resize: vertical; }
.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  background: #fff;
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}
.field .hint { font-size: .78rem; color: var(--steel-500); }
.field .error-msg { display: none; font-size: .78rem; color: #c0392b; }
.field.has-error input,
.field.has-error select,
.field.has-error textarea { border-color: #e08a80; background: #fff7f6; }
.field.has-error .error-msg { display: block; }

.form-foot { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; margin-top: 24px; }
.form-note { font-size: .78rem; color: var(--steel-500); margin: 0; max-width: 460px; }

.hp-field { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

.alert {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px 20px;
  margin-bottom: 22px;
  border-radius: 12px;
  font-size: .93rem;
  line-height: 1.6;
}
.alert--ok { background: #e9f9f3; border: 1px solid #b6e8d5; color: #14654a; }
.alert--err { background: #fdf1ef; border: 1px solid #f6cfc8; color: #98261b; }
.alert__icon {
  flex: 0 0 auto;
  display: inline-flex; align-items: center; justify-content: center;
  width: 26px; height: 26px; border-radius: 50%;
  background: #12a877; color: #fff; font-size: .9rem; font-weight: 700;
}
.alert--err .alert__icon { background: #cf4436; }
.alert b { display: block; margin-bottom: 2px; }
.alert p { margin: 0; }

/* ---------- Contact info blocks ---------- */
.info-list { display: grid; gap: 22px; }
.info-item { display: flex; gap: 16px; }
.info-item .ico {
  flex: 0 0 auto;
  display: inline-flex; align-items: center; justify-content: center;
  width: 44px; height: 44px; border-radius: 12px;
  background: var(--accent-soft); color: var(--accent-dark);
}
.info-item .ico svg { width: 21px; height: 21px; stroke: currentColor; fill: none; stroke-width: 1.6; }
.info-item h4 { margin: 0 0 3px; font-size: .82rem; letter-spacing: .12em; text-transform: uppercase; color: var(--steel-500); font-weight: 700; }
.info-item p { margin: 0; color: var(--ink-700); font-size: .96rem; }

/* ---------- CTA band ---------- */
.cta-band {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: clamp(58px, 7vw, 96px);
  background: linear-gradient(115deg, #071019 0%, #0d2333 48%, #06333a 100%);
  color: #dbe7f2;
}
.cta-band::before {
  content: "";
  position: absolute;
  right: -160px; top: -160px;
  width: 520px; height: 520px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0,179,198,.34), transparent 65%);
  z-index: -1;
}
.cta-band::after {
  content: "";
  position: absolute;
  left: -120px; bottom: -220px;
  width: 460px; height: 460px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(200,162,106,.18), transparent 65%);
  z-index: -1;
}
.cta-band__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 34px;
  flex-wrap: wrap;
}
.cta-band h2 { color: #fff; margin-bottom: 10px; max-width: 700px; }
.cta-band p { margin: 0; color: #a9bdcf; max-width: 640px; }
.cta-band__actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* ---------- Footer ---------- */
.site-footer {
  background: #05080e;
  color: #8fa1b6;
  padding-top: clamp(48px, 6vw, 76px);
  font-size: .92rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.15fr;
  gap: 40px 32px;
  padding-bottom: 46px;
}
.site-footer h3 {
  margin-bottom: 18px;
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: #fff;
}
.site-footer a { color: #a7b8cb; }
.site-footer a:hover { color: #4fdfec; }
.footer-brand img { width: 138px; margin-bottom: 18px; filter: brightness(1) invert(1); opacity: .92; }
.footer-brand p { font-size: .89rem; max-width: 340px; color: #8195ab; }
.footer-links { display: grid; gap: 10px; }
.footer-contact { display: grid; gap: 12px; font-size: .89rem; }
.footer-contact span { display: block; font-size: .74rem; letter-spacing: .1em; text-transform: uppercase; color: #62788f; margin-bottom: 1px; }
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding-block: 22px;
  border-top: 1px solid rgba(255,255,255,.08);
  font-size: .82rem;
  color: #6b8098;
}
.footer-bottom ul { display: flex; gap: 20px; flex-wrap: wrap; }

/* ---------- Back to top ---------- */
.to-top {
  position: fixed;
  right: 22px; bottom: 22px;
  z-index: 90;
  width: 46px; height: 46px;
  display: inline-flex; align-items: center; justify-content: center;
  border: 0; border-radius: 50%;
  background: var(--ink-800);
  color: #fff;
  box-shadow: var(--shadow-md);
  cursor: pointer;
  opacity: 0;
  transform: translateY(14px);
  pointer-events: none;
  transition: opacity .3s, transform .3s;
}
.to-top.is-visible { opacity: 1; transform: none; pointer-events: auto; }
.to-top:hover { background: var(--accent-dark); }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s var(--ease), transform .6s var(--ease); }
.no-js .reveal { opacity: 1; transform: none; }
.reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  *, *::before, *::after { animation-duration: .001ms !important; transition-duration: .001ms !important; }
}

/* ---------- Rich text blocks ---------- */
.prose h2 { margin-top: 2.2em; font-size: clamp(1.45rem, 1.15rem + 1.1vw, 1.95rem); }
.prose h2:first-child { margin-top: 0; }
.prose h3 { margin-top: 1.8em; }
.prose ul { display: grid; gap: 9px; margin: 0 0 1.2em; }
.prose ul li { position: relative; padding-left: 20px; }
.prose ul li::before {
  content: ""; position: absolute; left: 2px; top: .72em;
  width: 6px; height: 6px; border-radius: 50%; background: var(--accent);
}
.prose > p:last-child { margin-bottom: 0; }

.callout {
  padding: 22px 26px;
  margin: 26px 0;
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--paper-soft);
  color: #3a4f68;
  font-size: .96rem;
}
.callout p:last-child { margin-bottom: 0; }

.two-col-text { column-count: 2; column-gap: 44px; }
.two-col-text p { break-inside: avoid; }

/* ---------- Product detail layout ---------- */
.pd-layout { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: clamp(30px, 4.5vw, 62px); align-items: start; }
.pd-media {
  padding: clamp(20px, 4vw, 44px);
  border-radius: var(--radius-lg);
  background: radial-gradient(120% 100% at 50% 0%, #fff 0%, #eef3f9 62%, #e3eaf3 100%);
  border: 1px solid var(--steel-100);
  box-shadow: var(--shadow-sm);
}
.pd-media img { width: 100%; object-fit: contain; }
.pd-keyfacts { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 24px 0 0; }
.pd-keyfacts div {
  padding: 16px 18px;
  border-radius: 12px;
  background: var(--paper-soft);
  border: 1px solid var(--steel-100);
}
.pd-keyfacts dt { font-size: .72rem; letter-spacing: .1em; text-transform: uppercase; color: var(--steel-500); font-weight: 700; }
.pd-keyfacts dd { margin: 5px 0 0; font-size: 1rem; font-weight: 650; color: var(--ink-900); }

.pd-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}
.pd-nav a {
  padding: 9px 16px;
  border-radius: 999px;
  border: 1px solid var(--steel-200);
  font-size: .84rem;
  font-weight: 600;
  color: #3b4f68;
}
.pd-nav a:hover { border-color: var(--accent); color: var(--accent-dark); background: var(--accent-soft); }
.pd-nav a[aria-current="true"] { background: var(--ink-800); border-color: var(--ink-800); color: #fff; }

/* ---------- Utilities ---------- */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-40 { margin-top: 40px; }
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 1100px) {
  .nav a { padding: 10px 11px; font-size: .88rem; }
  .header-cta { display: none; }
  .gallery { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .cert-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: 1.4fr 1fr 1fr; }
  .footer-grid > :last-child { grid-column: 1 / -1; }
}

@media (max-width: 920px) {
  :root { --header-h: 72px; }

  .nav-toggle { display: inline-flex; }
  .nav {
    position: absolute;
    left: 0; right: 0; top: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 14px 22px 24px;
    margin: 0;
    background: #fff;
    border-bottom: 1px solid rgba(15,27,46,.08);
    box-shadow: 0 24px 40px rgba(9,17,30,.12);
    max-height: calc(100dvh - var(--header-h));
    overflow-y: auto;
    display: none;
  }
  .nav.is-open { display: flex; }
  .nav a { padding: 13px 8px; font-size: 1rem; border-radius: 8px; }
  .nav a::after { left: 8px; right: 8px; bottom: 8px; }
  .nav .btn { margin-top: 12px; }

  .hero__inner { padding-block: 64px; }
  .hero__stats { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px 16px; }
  .split, .pd-layout { grid-template-columns: 1fr; }
  .split--rev .split__media { order: 0; }
  .grid-3, .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 30px 24px; }
  .stat-band { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .gallery { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .cert-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .form-grid { grid-template-columns: 1fr; }
  .two-col-text { column-count: 1; }
  .cta-band__inner { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 620px) {
  body { font-size: 16px; }
  .hero h1 { font-size: clamp(1.85rem, 1.2rem + 3.4vw, 2.4rem); }
  .hero__lead { font-size: 1rem; }
  .container { padding-inline: 18px; }
  .brand { height: 52px; }
  .brand img { width: 112px; height: 60px; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .gallery { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
  .cert-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-grid > :last-child { grid-column: auto; }
  .pd-keyfacts { grid-template-columns: 1fr; }
  .hero__actions .btn, .cta-band__actions .btn { width: 100%; }
  .part__body { padding: 12px 13px 16px; }
  .part__body p { font-size: .76rem; }
  .card { padding: 26px 22px; }
  .faq__q { padding: 17px 18px; font-size: .96rem; }
  .faq__a { padding: 0 18px 18px; }
  .to-top { right: 14px; bottom: 14px; }
}

@media print {
  .site-header, .to-top, .cta-band, .site-footer { display: none; }
  body { color: #000; }
}