:root {
  --paper: #f4f8ff;
  --surface: #fbfdff;
  --ink: #102033;
  --muted: #536171;
  --blue: #1559cf;
  --blue-dark: #0d43a6;
  --blue-soft: #e8f0ff;
  --orange: #c94f16;
  --orange-soft: #fff0e7;
  --line: #d8dde3;
  --navy: #0d2138;
  --success: #12633c;
  --shadow: 0 22px 54px rgba(16, 32, 51, 0.12);
  --shadow-small: 0 10px 28px rgba(16, 32, 51, 0.08);
  --radius: 14px;
  --content: 1160px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 86px;
  overflow-x: hidden;
}

body {
  margin: 0;
  min-width: 280px;
  color: var(--ink);
  background-color: var(--paper);
  background-image: linear-gradient(rgba(246, 250, 255, 0.72), rgba(246, 250, 255, 0.72)), url('img/site-background-v16.webp');
  background-position: center top;
  background-size: cover;
  background-attachment: fixed;
  font: 400 16px/1.75 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  overflow-wrap: anywhere;
}

img { display: block; max-width: 100%; height: auto; }
a { color: inherit; }
button, input { font: inherit; }
button { cursor: pointer; }

:where(a, button, summary):focus-visible {
  outline: 3px solid rgba(21, 89, 207, 0.45);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  inset-block-start: 8px;
  inset-inline-start: 12px;
  z-index: 1000;
  padding: 10px 16px;
  color: #fff;
  background: var(--navy);
  transform: translateY(-150%);
}

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

.container {
  width: min(calc(100% - 40px), var(--content));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  inset-block-start: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(16, 32, 51, 0.11);
  background: rgba(247, 251, 255, 0.94);
  backdrop-filter: blur(14px) saturate(140%);
}

.nav-shell {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--ink);
  text-decoration: none;
  min-height: 44px;
}

.brand-mark {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  color: #fff;
  background: var(--navy);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.03em;
  box-shadow: 4px 5px 0 #b8cdf6;
}

.brand-copy { display: grid; line-height: 1.12; }
.brand-copy strong { font-size: 17px; letter-spacing: -0.02em; }
.brand-copy small { margin-top: 5px; color: var(--muted); font-size: 11px; letter-spacing: 0.06em; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-links a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  padding-inline: 13px;
  border-radius: 10px;
  color: #3d4d5e;
  text-decoration: none;
  font-size: 14px;
  font-weight: 650;
}

.nav-links a:hover { background: #ebe9e2; color: var(--ink); }
.nav-links a[aria-current="page"] { color: var(--blue-dark); background: var(--blue-soft); }

.nav-contact {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  padding-inline: 18px;
  border: 1px solid var(--navy);
  border-radius: 10px;
  color: #fff;
  background: var(--navy);
  text-decoration: none;
  font-size: 14px;
  font-weight: 700;
}

.menu-button {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--ink);
  background: var(--surface);
  align-items: center;
  justify-content: center;
}

.menu-button span,
.menu-button::before,
.menu-button::after {
  content: "";
  display: block;
  width: 20px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 180ms ease, opacity 180ms ease;
}

.menu-button span { margin-block: 5px; }
.menu-button[aria-expanded="true"] span { opacity: 0; }
.menu-button[aria-expanded="true"]::before { transform: translateY(7px) rotate(45deg); }
.menu-button[aria-expanded="true"]::after { transform: translateY(-7px) rotate(-45deg); }

main { min-height: 60vh; }

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.hero {
  padding-block: clamp(24px, 4vw, 46px) clamp(42px, 6vw, 68px);
  overflow: hidden;
}

.hero-poster {
  margin: 0;
  padding: clamp(8px, 1.5vw, 16px);
  border: 1px solid #b7c1cd;
  border-radius: 18px;
  background: #fff;
  box-shadow: var(--shadow-small);
}

.hero-poster img {
  width: 100%;
  border-radius: 10px;
}

.hero-poster figcaption {
  padding: 13px 7px 2px;
  color: var(--muted);
  font-size: 13px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(360px, 0.98fr);
  gap: clamp(42px, 7vw, 92px);
  align-items: center;
}

.hero-copy, .hero-visual { min-width: 0; }

.label {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 34px;
  padding-inline: 12px;
  border: 1px solid #bfcce0;
  border-radius: 999px;
  color: #244a7d;
  background: #f4f7fb;
  font-size: 13px;
  font-weight: 750;
}

.label::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--blue);
}

h1, h2, h3 { margin: 0; text-wrap: balance; }
h1 {
  max-width: 12ch;
  margin-top: 24px;
  font-size: clamp(2.55rem, 5.8vw, 4.75rem);
  line-height: 1.08;
  letter-spacing: -0.035em;
  font-weight: 780;
}

h1 em { color: var(--blue); font-style: normal; }

.lead {
  max-width: 64ch;
  margin: 26px 0 0;
  color: #445466;
  font-size: clamp(1.03rem, 1.9vw, 1.18rem);
  line-height: 1.85;
}

.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.button {
  min-height: 50px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding-inline: 22px;
  border: 1px solid transparent;
  border-radius: 10px;
  text-decoration: none;
  font-size: 15px;
  font-weight: 760;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.button:hover { transform: translateY(-2px); }
.button.primary { color: #fff; background: var(--blue); box-shadow: 5px 7px 0 #b8cdf6; }
.button.primary:hover { background: var(--blue-dark); box-shadow: 3px 4px 0 #b8cdf6; }
.button.secondary { color: var(--ink); border-color: #aeb7c1; background: var(--surface); }
.button.secondary:hover { border-color: var(--ink); box-shadow: var(--shadow-small); }

.hero-boundary {
  max-width: 66ch;
  margin: 24px 0 0;
  padding-top: 19px;
  border-top: 1px solid var(--line);
  color: #687482;
  font-size: 13px;
}

.drawing-frame {
  position: relative;
  padding: 18px;
  border: 1px solid #afbac7;
  border-radius: 16px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.drawing-frame::before,
.drawing-frame::after {
  content: "";
  position: absolute;
  pointer-events: none;
}

.drawing-frame::before {
  inset: 9px;
  border: 1px solid rgba(21, 89, 207, 0.26);
  border-radius: 11px;
}

.drawing-frame::after {
  width: 70px;
  height: 70px;
  inset-block-start: -15px;
  inset-inline-end: -14px;
  border-top: 2px solid var(--orange);
  border-right: 2px solid var(--orange);
}

.drawing-frame img {
  width: 100%;
  aspect-ratio: 1.0526;
  object-fit: cover;
  border-radius: 9px;
}

.drawing-caption {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 5px 3px;
  color: var(--muted);
  font-size: 13px;
}

.drawing-caption strong { color: var(--ink); }

.measure-tag {
  position: absolute;
  inset-inline-start: -24px;
  inset-block-end: 96px;
  padding: 8px 11px;
  border: 1px solid #c9d2dd;
  border-radius: 8px;
  color: var(--navy);
  background: var(--surface);
  box-shadow: var(--shadow-small);
  font-size: 12px;
  font-weight: 750;
}

.trust-strip { border-block: 1px solid var(--line); background: rgba(255, 253, 248, 0.72); }
.trust-grid { display: grid; grid-template-columns: repeat(3, 1fr); }
.trust-item { padding: 25px 28px; text-align: center; border-inline-end: 1px solid var(--line); }
.trust-item:last-child { border-inline-end: 0; }
.trust-item strong { display: block; font-size: 17px; }
.trust-item span { color: var(--muted); font-size: 13px; }

.section { padding-block: clamp(72px, 9vw, 118px); }
.section.surface { background: rgba(251, 253, 255, 0.9); border-block: 1px solid rgba(16, 32, 51, 0.08); }
.section.challenge-story { color: #fff; background: var(--navy); }

.section-heading { max-width: 760px; margin-bottom: clamp(34px, 5vw, 56px); }
.section-heading.center { margin-inline: auto; text-align: center; }
.section-heading h2 { font-size: clamp(2rem, 4vw, 3.35rem); line-height: 1.15; letter-spacing: -0.03em; }
.section-heading p { max-width: 68ch; margin: 18px 0 0; color: var(--muted); font-size: 17px; }
.home-main { overflow: hidden; }
.home-container { width: min(100%, 1600px); margin-inline: auto; }
.home-hero { padding-top: clamp(18px, 3vw, 42px); }
.home-ad { padding-top: clamp(10px, 1.5vw, 22px); }
.home-hero img, .home-ad img { width: 100%; }
.image-stage { position: relative; }
.home-image-blend img {
  -webkit-mask-image: radial-gradient(ellipse 78% 91% at 50% 50%, #000 72%, rgba(0,0,0,.96) 82%, rgba(0,0,0,.62) 92%, transparent 100%);
  mask-image: radial-gradient(ellipse 78% 91% at 50% 50%, #000 72%, rgba(0,0,0,.96) 82%, rgba(0,0,0,.62) 92%, transparent 100%);
}
.image-hotspot { position: absolute; z-index: 2; min-width: 44px; min-height: 44px; border-radius: 14px; text-decoration: none; }
.image-hotspot:hover { background: rgba(255,255,255,.12); box-shadow: 0 0 0 3px rgba(21,89,207,.35); }
.image-hotspot:focus-visible { outline: 4px solid #0d62e8; outline-offset: 4px; background: rgba(255,255,255,.16); }
.hero-view { inset-inline-start: 10.6%; inset-block-start: 77.2%; width: 12.9%; height: 8.8%; }
.hero-trial { inset-inline-start: 25.3%; inset-block-start: 77.2%; width: 13%; height: 8.8%; }
.ad-trial { inset-inline-start: 8%; inset-block-start: 84.4%; width: 15%; height: 10.2%; }
.ad-contact { inset-inline-start: 24.8%; inset-block-start: 84.4%; width: 14.6%; height: 10.2%; }
.audience-showcase { padding: clamp(52px, 7vw, 88px) max(24px, calc((100vw - 1440px) / 2)); background: rgba(237, 244, 253, .58); }
.audience-showcase h2 { margin-bottom: clamp(30px, 4vw, 48px); font-size: clamp(1.85rem, 3.4vw, 3rem); }
.audience-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px clamp(28px, 8vw, 130px); }
.audience-grid article { min-width: 0; padding: 32px 28px; border: 2px solid rgba(130,145,164,.58); border-radius: 15px; background: rgba(255,255,255,.9); box-shadow: 0 12px 30px rgba(42,79,126,.08); }
.audience-grid h3 { padding-inline-start: 14px; border-inline-start: 4px solid var(--blue); font-size: 20px; }
.audience-grid p { margin: 16px 0 0; color: var(--muted); font-size: 14px; }
.audience-grid p + p { margin-top: 8px; }
.video-block { padding: 0 max(0px, calc((100vw - 1600px) / 2)); text-align: center; }
.video-block > h2 { font-size: clamp(1.8rem, 3.4vw, 2.75rem); }
.video-placeholder { min-height: clamp(360px, 44vw, 680px); display: grid; place-content: center; justify-items: center; gap: 14px; margin: 0; padding: 32px; border-radius: 28px 28px 0 0; color: #0b1119; background: #929697; box-shadow: var(--shadow); }
.video-symbol { width: 120px; height: 120px; display: grid; place-items: center; padding-inline-start: 7px; border: 12px solid #51b7f1; border-radius: 50%; color: #0a3358; background: transparent; font-size: 42px; }
.video-placeholder strong { font-size: clamp(1.2rem, 2.3vw, 1.75rem); }
.video-placeholder p { margin: 0; color: #172332; }
.pain-layout { display: grid; grid-template-columns: 0.78fr 1.22fr; gap: clamp(36px, 7vw, 88px); align-items: start; }
.eyebrow { display: block; margin-bottom: 16px; color: var(--blue-dark); font-size: 12px; font-weight: 800; letter-spacing: .12em; }
.story-intro h2 { font-size: clamp(2rem, 4vw, 3.35rem); line-height: 1.16; letter-spacing: -.03em; }
.challenge-story .eyebrow { color: #78aaf7; }
.story-intro p { margin: 20px 0 0; color: #b8c7d7; }
.pain-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid rgba(255,255,255,.22); }
.pain-list li { display: grid; grid-template-columns: 42px 1fr; gap: 16px; padding-block: 22px; border-bottom: 1px solid rgba(255,255,255,.22); }
.pain-list b { color: #78aaf7; font-size: 13px; padding-top: 3px; }
.pain-list strong { display: block; font-size: 18px; }
.pain-list span { display: block; margin-top: 5px; color: #b8c7d7; font-size: 14px; }

.service-rail { display: grid; grid-template-columns: repeat(4, 1fr); border-block: 1px solid var(--line); }
.service-step { position: relative; min-width: 0; padding: 30px 26px 34px; border-inline-end: 1px solid var(--line); }
.service-step:last-child { border-inline-end: 0; }
.service-step b { display: block; color: var(--blue); font-size: 13px; }
.service-step h3 { margin-top: 17px; font-size: 20px; letter-spacing: -0.015em; }
.service-step p { margin: 10px 0 0; color: var(--muted); font-size: 14px; }

.stair-gallery-heading { display: grid; grid-template-columns: .7fr 1.3fr; gap: 28px; align-items: end; margin: 58px 0 22px; padding-top: 34px; border-top: 1px solid var(--line); }
.stair-gallery-heading h3 { font-size: clamp(1.65rem, 3vw, 2.35rem); letter-spacing: -.025em; }
.stair-gallery-heading p { margin: 0; color: var(--muted); }
.stair-type-gallery { display: grid; grid-template-columns: repeat(6, minmax(150px, 1fr)); overflow-x: auto; overscroll-behavior-inline: contain; border-top: 1px solid var(--line); border-left: 1px solid var(--line); scrollbar-width: thin; }
.stair-type { min-width: 150px; margin: 0; padding: 18px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: #fff; }
.stair-type img { width: 100%; aspect-ratio: 1; object-fit: contain; background: #fff; cursor: zoom-in; }
.stair-type img:hover { outline: 2px solid rgba(21, 89, 207, .35); outline-offset: 3px; }
.stair-type figcaption { display: grid; gap: 2px; padding: 14px 2px 2px; }
.stair-type figcaption strong { font-size: 16px; }
.stair-type figcaption span { color: var(--muted); font-size: 13px; }
.stair-type-gallery.compact { margin: 28px 0 42px; }
.stair-type-gallery.compact .stair-type { padding: 12px; }
.stair-type-gallery.compact .stair-type figcaption { padding-top: 9px; }
.gallery-hint { margin: 12px 0 0; color: var(--muted); font-size: 13px; }

.boundary-layout { display: grid; grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr); gap: clamp(38px, 7vw, 90px); align-items: start; }
.boundary-sticky { position: sticky; top: 110px; }
.boundary-sticky h2 { font-size: clamp(2rem, 4vw, 3.25rem); line-height: 1.16; letter-spacing: -0.03em; }
.boundary-sticky p { margin: 18px 0 0; color: var(--muted); }
.boundary-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.boundary-list li { display: grid; grid-template-columns: 126px 1fr; gap: 24px; padding-block: 24px; border-bottom: 1px solid var(--line); }
.boundary-list strong { color: var(--blue-dark); }
.boundary-list p { margin: 0; color: var(--muted); }

.proof-note { margin-top: 26px; padding: 18px 20px; border: 1px solid #ecc5ad; border-radius: 10px; color: #713315; background: var(--orange-soft); font-size: 14px; }

.cta-band { padding-block: clamp(56px, 8vw, 88px); }
.cta-box { display: grid; grid-template-columns: 1fr auto; gap: 32px; align-items: center; padding: clamp(30px, 5vw, 54px); color: #fff; background: var(--blue-dark); border-radius: 16px; box-shadow: 8px 10px 0 #b8cdf6; }
.cta-box h2 { font-size: clamp(1.75rem, 3vw, 2.65rem); letter-spacing: -0.025em; }
.cta-box p { max-width: 62ch; margin: 10px 0 0; color: #d7e4f8; }
.cta-box .button { color: var(--navy); background: #fff; }

.page-hero { padding-block: clamp(58px, 8vw, 92px) clamp(52px, 7vw, 76px); border-bottom: 1px solid var(--line); }
.page-hero .breadcrumbs { margin-bottom: 22px; color: var(--muted); font-size: 13px; }
.page-hero .breadcrumbs a { color: var(--blue-dark); }
.page-hero h1 { max-width: 16ch; margin-top: 0; font-size: clamp(2.4rem, 5vw, 4.25rem); }
.page-hero .lead { max-width: 70ch; }
.page-hero.compact-page-hero { padding-block: clamp(42px, 6vw, 66px); }

.breadcrumbs { color: var(--muted); font-size: 13px; }
.breadcrumbs a { color: var(--blue-dark); }
.service-body { padding-top: clamp(58px, 8vw, 92px); }
.service-article-heading { margin-bottom: 56px; padding-bottom: 42px; border-bottom: 1px solid var(--line); }
.service-article-heading .eyebrow { margin-top: 28px; }
.service-article-heading h1 { max-width: 15ch; margin-top: 0; font-size: clamp(2.2rem, 4vw, 3.5rem); }
.service-article-heading .lead { max-width: 64ch; }

.content-grid { display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: clamp(36px, 7vw, 88px); align-items: start; }
.side-nav { position: sticky; top: 106px; padding: 18px 0; border-block: 1px solid var(--line); }
.side-nav strong { display: block; margin-bottom: 9px; font-size: 13px; color: var(--muted); }
.side-nav a { min-height: 44px; display: flex; align-items: center; color: #344658; text-decoration: none; font-size: 14px; }
.side-nav a:hover { color: var(--blue-dark); }

.prose { max-width: 74ch; min-width: 0; }
.prose > *:first-child { margin-top: 0; }
.prose h2 { margin: 0 0 18px; padding-top: 20px; font-size: clamp(1.65rem, 3vw, 2.25rem); letter-spacing: -0.025em; }
.prose h2:not(:first-child) { margin-top: 52px; }
.prose h3 { margin: 32px 0 12px; font-size: 20px; }
.prose p { margin: 0 0 18px; color: #425264; }
.prose ul, .prose ol { margin: 0 0 24px; padding-inline-start: 24px; color: #425264; }
.prose li { margin-block: 9px; padding-inline-start: 5px; }
.prose a { color: var(--blue-dark); text-underline-offset: 3px; }
.prose .callout { margin: 26px 0; padding: 20px 22px; border: 1px solid #b8c6d8; border-radius: 10px; background: #f1f5fa; }
.prose .callout strong { display: block; margin-bottom: 5px; color: var(--navy); }

.compare { width: 100%; border-collapse: collapse; margin: 26px 0 34px; font-size: 14px; }
.compare th, .compare td { padding: 16px 18px; border-bottom: 1px solid var(--line); text-align: start; vertical-align: top; }
.compare th { color: var(--ink); background: #eeece5; }
.compare td { color: #425264; background: rgba(255,255,255,.48); }
.compare td:first-child { width: 28%; color: var(--ink); font-weight: 700; }

.faq-layout { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: clamp(34px, 6vw, 76px); align-items: start; }
.faq-index { position: sticky; top: 106px; padding: 18px 0; border-block: 1px solid var(--line); }
.faq-index strong { display: block; margin-bottom: 9px; color: var(--muted); font-size: 13px; }
.faq-index a { min-height: 44px; display: flex; align-items: center; color: #344658; font-size: 14px; text-decoration: none; }
.faq-index a:hover { color: var(--blue-dark); }
.faq-content { min-width: 0; }
.faq-list { max-width: 860px; border-top: 1px solid var(--line); }
.faq-anchor { display: block; height: 0; scroll-margin-top: 98px; }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 20px; cursor: pointer; list-style: none; font-size: 18px; font-weight: 700; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; width: 32px; height: 32px; flex: 0 0 auto; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 50%; color: var(--blue-dark); font-size: 22px; font-weight: 400; }
.faq-list details[open] summary::after { content: "−"; }
.faq-list details p { max-width: 72ch; margin: -4px 0 26px; color: var(--muted); }
.faq-page-section { min-height: 68vh; }
.faq-answer { padding-bottom: 24px; color: var(--muted); }
.faq-answer p { margin: 0 0 12px; }
.faq-answer ul { margin: 0 0 16px; padding-inline-start: 24px; }
.faq-answer li { margin-block: 8px; }
.faq-answer .inline-boundary { margin: 18px 0 0; padding: 13px 15px; color: #344658; background: #eceae3; }
.faq-list .inline-boundary { display: block; margin-top: 14px; color: #344658; font-size: 14px; }

.company-facts { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); border-top: 1px solid var(--line); }
.fact { min-width: 0; padding: 24px 20px 24px 0; border-bottom: 1px solid var(--line); }
.fact:nth-child(odd) { margin-inline-end: 24px; border-inline-end: 1px solid var(--line); }
.fact span { display: block; color: var(--muted); font-size: 13px; }
.fact strong { display: block; margin-top: 5px; font-size: 16px; overflow-wrap: anywhere; }

.contact-layout { display: grid; grid-template-columns: 1fr 360px; gap: clamp(38px, 7vw, 86px); align-items: start; }
.contact-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.contact-list li { display: grid; grid-template-columns: 105px 1fr auto; gap: 18px; align-items: center; min-height: 76px; border-bottom: 1px solid var(--line); }
.contact-list span { color: var(--muted); font-size: 14px; }
.contact-list a, .contact-list strong { color: var(--ink); text-decoration: none; overflow-wrap: anywhere; }
.copy-button { min-width: 72px; min-height: 44px; padding-inline: 12px; border: 1px solid #aeb7c1; border-radius: 9px; color: var(--blue-dark); background: var(--surface); font-size: 13px; font-weight: 750; }
.copy-button:hover { border-color: var(--blue-dark); }
.copy-status { min-height: 26px; margin-top: 14px; color: var(--success); font-size: 13px; }
.qr-panel { padding: 26px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow-small); }
.qr-panel img { width: min(100%, 272px); margin-inline: auto; }
.qr-panel h2 { margin-top: 20px; font-size: 21px; }
.qr-panel p { margin: 8px 0 0; color: var(--muted); font-size: 14px; }
.contact-page-section { min-height: 70vh; }
.contact-page-section .breadcrumbs { margin-bottom: 38px; padding-bottom: 20px; border-bottom: 1px solid var(--line); }
.contact-page-section .qr-panel p { color: #ef3f3f; text-align: center; font-size: 16px; font-weight: 700; }

.policy-shell { padding-block: clamp(48px, 7vw, 86px); }
.policy-article { max-width: 820px; }
.policy-heading { margin-bottom: 46px; padding-bottom: 34px; border-bottom: 1px solid var(--line); }
.policy-heading h1 { max-width: none; margin-top: 22px; font-size: clamp(2.35rem, 5vw, 4rem); }
.policy-heading .lead { max-width: 72ch; }
.policy-date { margin: 18px 0 0; color: var(--muted); font-size: 13px; }
.policy-article > p { margin: 0 0 20px; color: #425264; }
.policy-article h2 { margin: 54px 0 18px; font-size: clamp(1.55rem, 3vw, 2.05rem); letter-spacing: -.02em; }
.policy-article a { color: var(--blue-dark); text-underline-offset: 3px; }
.policy-compact { font-size: 12px; line-height: 1.85; }
.policy-compact h1 { font-family: "SimHei", "Microsoft YaHei", sans-serif; font-size: 14px; line-height: 1.55; font-weight: 700; }
.policy-compact h2 { font-family: "SimHei", "Microsoft YaHei", sans-serif; font-size: 14px; line-height: 1.55; font-weight: 700; }
.policy-compact h3 { font-family: "SimHei", "Microsoft YaHei", sans-serif; font-size: 14px; line-height: 1.55; font-weight: 700; }
.policy-compact .policy-heading { margin-bottom: 32px; padding-bottom: 24px; }
.policy-compact .policy-heading h1 { margin-top: 16px; }
.policy-compact .lead,
.policy-compact .policy-date,
.policy-compact > p,
.policy-compact li { font-size: 12px; }
.policy-compact h2 { margin: 38px 0 14px; }

.company-introduction { max-width: 980px; }
.company-lead { display: grid; grid-template-columns: .8fr 1.2fr; column-gap: clamp(34px, 7vw, 84px); padding-bottom: 52px; border-bottom: 1px solid var(--line); }
.company-lead .eyebrow { grid-column: 1 / -1; }
.company-lead h2 { font-size: clamp(2rem, 4vw, 3.2rem); line-height: 1.18; letter-spacing: -.03em; }
.company-lead p { margin: 0; color: var(--muted); }
.company-story { display: grid; grid-template-columns: repeat(3, 1fr); border-bottom: 1px solid var(--line); }
.company-story section { padding: 36px 28px 40px 0; }
.company-story section + section { padding-left: 28px; border-left: 1px solid var(--line); }
.company-story h2 { font-size: 20px; }
.company-story p { margin: 14px 0 0; color: var(--muted); }
.company-public-info { padding-top: 58px; }
.company-public-info > h2 { font-size: clamp(1.7rem, 3vw, 2.25rem); }
.company-public-info > p { color: var(--muted); }
.company-public-info a { color: var(--blue-dark); }

.company-profile-section { min-height: 70vh; }
.company-profile { max-width: 980px; }
.company-profile > .breadcrumbs { margin-bottom: 52px; }
.company-profile-heading { display: grid; grid-template-columns: .72fr 1.28fr; align-items: end; gap: clamp(28px, 6vw, 72px); padding-bottom: 38px; border-bottom: 1px solid var(--line); }
.company-profile-heading h1 { max-width: none; margin: 0; font-size: clamp(2.45rem, 5vw, 4rem); }
.company-profile-heading p { margin: 0 0 8px; color: var(--ink); font-size: clamp(1.1rem, 2vw, 1.45rem); }
.company-profile-copy { margin: 38px 0 0; color: var(--ink); font-size: clamp(1.05rem, 2vw, 1.35rem); line-height: 1.9; }
.business-heading { margin: 32px 0 24px; font-size: clamp(1.45rem, 2.8vw, 2rem); font-weight: 600; }
.business-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px clamp(34px, 7vw, 88px); max-width: 760px; margin-inline: auto; }
.business-tile { min-height: 72px; display: grid; place-items: center; padding: 16px 22px; border: 1px solid #aeb3b8; border-radius: 12px; color: #080b0e; background: #d9d9d9; text-align: center; font-size: clamp(1.05rem, 2vw, 1.35rem); }

.not-found { min-height: 64vh; display: grid; place-items: center; padding-block: 80px; }
.not-found-inner { max-width: 700px; text-align: center; }
.not-found-code { color: var(--blue); font-size: clamp(4.5rem, 16vw, 9rem); line-height: 1; letter-spacing: -0.04em; font-weight: 800; }
.not-found h1 { max-width: none; margin: 18px 0 0; font-size: clamp(2rem, 4vw, 3rem); }
.not-found p { color: var(--muted); }
.not-found .actions { justify-content: center; }

.site-footer { margin-top: 0; padding-block: 39px 16px; color: #d5dfeb; background: var(--navy); }
.footer-grid { display: grid; grid-template-columns: 1.3fr .7fr .7fr; gap: 54px; }
.footer-brand .brand { color: #fff; }
.footer-brand .brand-mark { color: var(--navy); background: #fff; box-shadow: 4px 5px 0 #315173; }
.footer-brand .brand-copy small { color: #9fb0c1; }
.footer-brand p { max-width: 50ch; margin: 20px 0 0; color: #afbdcb; font-size: 14px; }
.footer-qr { width: 120px; height: 120px; margin-top: 22px; padding: 7px; background: #fff; }
.footer-col strong { display: block; margin-bottom: 12px; color: #fff; font-size: 14px; }
.footer-col a { min-height: 44px; display: flex; align-items: center; color: #bdcad7; text-decoration: none; font-size: 14px; }
.footer-col a:hover { color: #fff; text-decoration: underline; text-underline-offset: 4px; }
.footer-bottom { display: flex; justify-content: space-between; gap: 24px; margin-top: 29px; padding-top: 15px; border-top: 1px solid rgba(255,255,255,.16); color: #93a5b8; font-size: 12px; }
.footer-bottom a { color: #c9d6e3; text-underline-offset: 3px; }
.footer-legal { display: inline-flex; flex-wrap: wrap; gap: 18px; }

.customer-service { position: fixed; inset-inline-end: max(18px, calc((100vw - var(--content)) / 2 - 92px)); inset-block-end: 18vh; z-index: 220; display: grid; justify-items: end; gap: 10px; }
.customer-service-trigger { width: 68px; height: 68px; display: grid; grid-template-rows: 24px auto; place-items: center; align-content: center; gap: 2px; padding: 7px 5px 6px; border: 1px solid rgba(255,255,255,.58); border-radius: 50%; color: #fff; background: #256dff; box-shadow: 0 14px 34px rgba(31,98,232,.3); font-size: 13px; font-weight: 760; line-height: 1; }
.customer-service-trigger::before { content: ""; width: 23px; height: 18px; display: block; border-radius: 50%; background: #fff; clip-path: polygon(0 0,100% 0,100% 78%,63% 78%,48% 100%,49% 78%,0 78%); }
.customer-service-trigger:hover { background: #1559cf; transform: translateY(-2px); }
.customer-service-panel { position: absolute; inset-inline-end: 0; inset-block-end: calc(100% + 10px); width: min(330px, calc(100vw - 30px)); padding: 24px; border: 1px solid var(--line); border-radius: 14px; color: var(--ink); background: #fff; box-shadow: 0 24px 64px rgba(13,33,56,.26); }
.customer-service-panel[hidden] { display: none; }
.customer-service-panel h2 { margin: 0; font-size: 24px; }
.customer-service-panel p { margin: 8px 30px 16px 0; color: var(--muted); }
.customer-service-panel img { width: 210px; margin: 0 auto 14px; }
.customer-service-panel a, .customer-service-panel small { display: block; color: var(--muted); text-align: center; }
.customer-service-panel a { min-height: 44px; align-content: center; text-underline-offset: 3px; }
.customer-service-panel small { margin-top: 4px; }
.customer-service-close { position: absolute; inset-block-start: 14px; inset-inline-end: 14px; width: 36px; height: 36px; border: 1px solid var(--line); border-radius: 50%; color: var(--ink); background: #fff; font-size: 24px; line-height: 1; }

.image-lightbox { position: fixed; inset: 0; z-index: 300; display: grid; place-items: center; padding: 24px; }
.image-lightbox[hidden] { display: none; }
.image-lightbox-backdrop { position: absolute; inset: 0; border: 0; background: rgba(4, 12, 22, .86); cursor: zoom-out; }
.image-lightbox-dialog { position: relative; z-index: 1; width: min(960px, 100%); max-height: calc(100vh - 48px); display: grid; justify-items: center; gap: 12px; padding: 46px 20px 18px; border: 1px solid rgba(255,255,255,.24); border-radius: 14px; color: #fff; background: #102033; box-shadow: 0 28px 90px rgba(0,0,0,.48); }
.image-lightbox-image { max-width: 100%; max-height: calc(100vh - 150px); object-fit: contain; background: #fff; }
.image-lightbox-caption { margin: 0; color: #dbe6f0; text-align: center; }
.image-lightbox-close { position: absolute; inset-block-start: 10px; inset-inline-end: 10px; width: 38px; height: 38px; border: 1px solid rgba(255,255,255,.45); border-radius: 50%; color: #fff; background: transparent; font-size: 25px; line-height: 1; }
body.lightbox-open { overflow: hidden; }

.has-js .hero-copy { animation: copy-in 560ms cubic-bezier(.16,1,.3,1) both; }
.has-js .hero-visual { animation: visual-in 700ms 80ms cubic-bezier(.16,1,.3,1) both; }
@keyframes copy-in { from { transform: translateY(16px); filter: blur(5px); clip-path: inset(0 0 8% 0); } }
@keyframes visual-in { from { transform: translateY(20px) rotate(.4deg); filter: blur(6px); clip-path: inset(5% 3% 5% 3% round 18px); } }

@media (max-width: 920px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-copy { max-width: 760px; }
  .hero-visual { max-width: 650px; }
  .pain-layout, .boundary-layout, .contact-layout { grid-template-columns: 1fr; }
  .boundary-sticky, .side-nav, .faq-index { position: static; }
  .service-rail { grid-template-columns: repeat(2, 1fr); }
  .audience-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .service-step:nth-child(2) { border-inline-end: 0; }
  .service-step:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .content-grid { grid-template-columns: 1fr; }
  .faq-layout { grid-template-columns: 1fr; }
  .faq-index { display: flex; flex-wrap: wrap; gap: 4px 18px; }
  .faq-index strong { width: 100%; }
  .side-nav { display: flex; flex-wrap: wrap; gap: 4px 18px; }
  .side-nav strong { width: 100%; }
  .contact-layout .qr-panel { max-width: 420px; }
  .company-lead, .company-profile-heading { grid-template-columns: 1fr; }
  .company-lead p { margin-top: 22px; }
  .company-profile-heading p { margin-top: 8px; }
  .company-story { grid-template-columns: 1fr; }
  .company-story section { padding: 30px 0; }
  .company-story section + section { padding-left: 0; border-left: 0; border-top: 1px solid var(--line); }
}

@media (max-width: 760px) {
  .container { width: min(calc(100% - 30px), var(--content)); }
  .nav-shell { min-height: 64px; flex-wrap: wrap; }
  .menu-button { display: block; }
  .nav-contact { display: none; }
  .nav-links {
    width: 100%;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 3px 0 12px;
  }
  .nav-links[data-open="true"] { display: flex; }
  .nav-links a { justify-content: space-between; border-radius: 0; border-top: 1px solid var(--line); }
  h1 { max-width: 13ch; }
  .hero { padding-top: 52px; }
  .hero-grid { gap: 48px; }
  .measure-tag { inset-inline-start: 4px; inset-block-end: 88px; }
  .stair-gallery-heading { grid-template-columns: 1fr; gap: 10px; }
  .cta-box { grid-template-columns: 1fr; }
  .cta-box .button { width: 100%; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-bottom { flex-direction: column; }
  .company-facts { grid-template-columns: 1fr; }
  .fact:nth-child(odd) { margin-inline-end: 0; border-inline-end: 0; }
  .contact-list li { grid-template-columns: 82px minmax(0, 1fr); padding-block: 14px; }
  .contact-list .copy-button { grid-column: 2; justify-self: start; }
  .compare { display: block; overflow-x: auto; }
  .business-grid { gap: 16px; }
  body { background-attachment: scroll; }
  .customer-service { inset-inline-end: 15px; inset-block-end: 16vh; }
}

@media (max-width: 520px) {
  body { font-size: 15px; }
  .brand-copy small { display: none; }
  .hero { padding-block: 46px 66px; }
  .lead { font-size: 16px; }
  .actions .button { width: 100%; }
  .drawing-frame { padding: 12px; }
  .drawing-caption { flex-direction: column; gap: 2px; }
  .measure-tag { position: static; display: inline-flex; margin-top: 12px; }
  .service-rail { grid-template-columns: 1fr; }
  .audience-grid { grid-template-columns: 1fr; }
  .video-placeholder { min-height: 300px; }
  .service-step { border-inline-end: 0; border-bottom: 1px solid var(--line); }
  .service-step:last-child { border-bottom: 0; }
  .boundary-list li { grid-template-columns: 1fr; gap: 6px; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-brand { grid-column: auto; }
  .faq-list summary { min-height: 66px; font-size: 16px; }
  .business-grid { grid-template-columns: 1fr; }
  .company-profile-copy { font-size: 17px; }
  .image-lightbox { padding: 12px; }
  .image-lightbox-dialog { max-height: calc(100vh - 24px); padding-inline: 12px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

@media (forced-colors: active) {
  .brand-mark, .button.primary, .cta-box { border: 2px solid CanvasText; }
  .label::before { forced-color-adjust: none; }
}

@media print {
  .site-header, .actions, .cta-band, .menu-button, .customer-service, .image-lightbox { display: none !important; }
  body { color: #000; background: #fff; }
  .section, .page-hero { padding-block: 28px; }
  a { color: #000; text-decoration: none; }
}