:root {
  --navy-950: #083451;
  --navy-900: #0c4568;
  --navy-800: #12597f;
  --blue-700: #0869a9;
  --blue-600: #0784c7;
  --cyan-500: #16b8d9;
  --cyan-300: #7de4ef;
  --aqua-100: #e8fbfd;
  --ink: #122436;
  --muted: #607488;
  --line: #dce7ee;
  --soft: #f2f9fd;
  --white: #fff;
  --success: #1a8b73;
  --shadow-sm: 0 8px 28px rgba(7, 47, 77, .08);
  --shadow-lg: 0 24px 70px rgba(8, 72, 109, .14);
  --radius-sm: 10px;
  --radius: 18px;
  --radius-lg: 28px;
  --container: 1200px;
  --header-h: 78px;
  --ease: cubic-bezier(.2, .8, .2, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 96px; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: "Inter", "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
body.menu-open { overflow: hidden; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; }
button { color: inherit; }
h1, h2, h3, h4, p, ul, ol { margin-top: 0; }
h1, h2, h3, h4 { color: var(--navy-950); line-height: 1.25; letter-spacing: -.025em; }
p { color: var(--muted); }
::selection { background: rgba(22, 184, 217, .22); color: var(--navy-950); }

.skip-link {
  position: fixed;
  top: -60px;
  left: 18px;
  z-index: 999;
  padding: 10px 16px;
  color: var(--white);
  background: var(--blue-700);
  border-radius: 0 0 8px 8px;
  transition: top .2s;
}
.skip-link:focus { top: 0; }
.container { width: min(calc(100% - 40px), var(--container)); margin-inline: auto; }
.narrow { width: min(calc(100% - 40px), 850px); margin-inline: auto; }
.section { padding: 108px 0; }
.section-sm { padding: 72px 0; }
.section-soft { background: var(--soft); }
.section-dark { color: var(--white); background: var(--navy-950); }
.section-dark h2, .section-dark h3, .section-dark p { color: var(--white); }
.section-dark p { opacity: .72; }
.section-head { max-width: 760px; margin-bottom: 48px; }
.section-head.row { max-width: none; display: flex; align-items: end; justify-content: space-between; gap: 36px; }
.section-head.row > div:first-child { max-width: 760px; }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 16px;
  color: var(--blue-700);
  font-size: 13px;
  font-weight: 750;
  letter-spacing: .14em;
  text-transform: uppercase;
}
.eyebrow::before { content: ""; width: 26px; height: 2px; background: var(--cyan-500); }
.section-title { margin-bottom: 18px; font-size: clamp(32px, 4vw, 50px); }
.section-lead { max-width: 720px; margin-bottom: 0; font-size: 18px; }
.text-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--blue-700);
  font-weight: 700;
}
.text-link svg { transition: transform .25s var(--ease); }
.text-link:hover svg { transform: translateX(4px); }
.tag {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 4px 10px;
  color: var(--blue-700);
  background: var(--aqua-100);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  color: var(--navy-950);
  background: rgba(255,255,255,.94);
  border-bottom: 1px solid rgba(8,105,169,.1);
  box-shadow: 0 6px 28px rgba(8,72,109,.05);
  backdrop-filter: blur(15px);
  transition: background .3s, box-shadow .3s, color .3s, transform .3s;
}
.site-header.scrolled, .site-header.inner-header {
  color: var(--navy-950);
  background: rgba(255,255,255,.96);
  box-shadow: 0 8px 32px rgba(7,38,64,.08);
  backdrop-filter: blur(15px);
}
.header-inner { height: var(--header-h); display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 12px; flex: 0 0 auto; }
.brand-mark { width: 50px; height: 50px; flex: 0 0 50px; object-fit: contain; }
.brand-cn { display: block; color: inherit; font-size: 18px; font-weight: 800; line-height: 1.2; letter-spacing: .02em; }
.brand-en { display: block; margin-top: 3px; opacity: .66; font-size: 9px; font-weight: 700; line-height: 1; letter-spacing: .13em; text-transform: uppercase; }
.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a { position: relative; padding: 27px 15px 25px; font-size: 15px; font-weight: 600; }
.main-nav a::after {
  content: "";
  position: absolute;
  right: 15px;
  bottom: 18px;
  left: 15px;
  height: 2px;
  background: var(--cyan-500);
  transform: scaleX(0);
  transition: transform .25s var(--ease);
}
.main-nav a:hover::after, .main-nav a.active::after { transform: scaleX(1); }
.menu-toggle { display: none; width: 46px; height: 46px; padding: 0; background: transparent; border: 0; border-radius: 8px; }
.menu-toggle span { display: block; width: 24px; height: 2px; margin: 5px auto; background: currentColor; transition: .25s; }

.hero {
  position: relative;
  min-height: 760px;
  color: var(--navy-950);
  background: #eef9fd url("../images/hero-water-treatment.webp") 68% center/cover no-repeat;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(255,255,255,.99) 0%, rgba(248,253,255,.96) 31%, rgba(238,249,253,.74) 54%, rgba(235,248,253,.2) 78%);
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: .2;
  background-image: linear-gradient(rgba(8,132,199,.11) 1px, transparent 1px), linear-gradient(90deg, rgba(8,132,199,.11) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(90deg, black, transparent 70%);
}
.hero-inner { position: relative; z-index: 2; min-height: 760px; display: flex; align-items: center; padding-top: var(--header-h); }
.hero-content { max-width: 720px; padding: 72px 0 92px; }
.hero-kicker { display: flex; align-items: center; gap: 12px; margin-bottom: 22px; color: var(--blue-700); font-size: 14px; font-weight: 700; letter-spacing: .12em; }
.hero-kicker::before { content: ""; width: 34px; height: 1px; background: currentColor; }
.hero h1 { margin-bottom: 26px; color: var(--navy-950); font-size: clamp(46px, 6vw, 74px); font-weight: 760; line-height: 1.08; }
.hero h1 span { color: var(--blue-600); }
.hero-copy { max-width: 650px; margin-bottom: 36px; color: #496a7f; font-size: clamp(17px, 2vw, 20px); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 52px;
  padding: 12px 24px;
  border: 1px solid transparent;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 750;
  transition: transform .25s var(--ease), box-shadow .25s, background .25s, color .25s;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { color: var(--white); background: linear-gradient(135deg, var(--blue-600), var(--cyan-500)); box-shadow: 0 14px 35px rgba(8,132,199,.26); }
.btn-primary:hover { box-shadow: 0 18px 42px rgba(8,132,199,.36); }
.btn-outline { color: var(--blue-700); background: rgba(255,255,255,.76); border-color: #a9d7e7; backdrop-filter: blur(8px); }
.btn-outline:hover { background: var(--white); }
.btn-light { color: var(--blue-700); background: var(--white); }
.btn-ghost { color: var(--blue-700); background: transparent; border-color: #bdd5e2; }
.hero-notes { display: flex; flex-wrap: wrap; gap: 26px; margin-top: 40px; }
.hero-note { display: flex; align-items: center; gap: 9px; color: #55758a; font-size: 14px; }
.hero-note svg { color: var(--blue-600); }
.hero-side-label {
  position: absolute;
  z-index: 3;
  right: 34px;
  bottom: 124px;
  color: rgba(8,78,116,.42);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .2em;
  text-transform: uppercase;
  writing-mode: vertical-rl;
}
.hero-index {
  position: relative;
  z-index: 5;
  margin-top: -74px;
}
.index-panel {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.index-item { position: relative; min-height: 148px; padding: 28px 26px; border-right: 1px solid var(--line); }
.index-item:last-child { border-right: 0; }
.index-no { margin-bottom: 18px; color: var(--cyan-500); font-size: 12px; font-weight: 800; }
.index-item h3 { margin-bottom: 6px; font-size: 18px; }
.index-item p { margin: 0; font-size: 13px; line-height: 1.6; }

.about-grid { display: grid; grid-template-columns: 1.02fr .98fr; gap: 80px; align-items: center; }
.about-visual { position: relative; min-height: 540px; }
.about-image-main {
  position: absolute;
  inset: 0 70px 65px 0;
  border-radius: var(--radius-lg);
  background: url("../images/guangsheng-office.jpg") center/cover no-repeat;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.about-image-main::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 58%, rgba(8,52,81,.42)); }
.about-caption { position: absolute; right: 0; bottom: 0; z-index: 2; width: 230px; padding: 24px; color: var(--white); background: var(--navy-950); border-radius: var(--radius); box-shadow: var(--shadow-lg); }
.about-caption strong { display: block; margin-bottom: 6px; color: var(--cyan-300); font-size: 28px; }
.about-caption span { font-size: 14px; opacity: .76; }
.feature-list { display: grid; gap: 18px; margin: 30px 0 34px; }
.feature-item { display: grid; grid-template-columns: 42px 1fr; gap: 14px; align-items: start; }
.feature-icon { display: grid; place-items: center; width: 42px; height: 42px; color: var(--blue-700); background: var(--aqua-100); border-radius: 12px; }
.feature-item h3 { margin: 1px 0 4px; font-size: 17px; }
.feature-item p { margin: 0; font-size: 14px; }

.product-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.product-card {
  position: relative;
  min-height: 315px;
  padding: 30px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform .3s var(--ease), box-shadow .3s, border-color .3s;
}
.product-photo { height: 172px; margin: -30px -30px 24px; overflow: hidden; background: #e8f6fb; }
.product-photo img { width: 100%; height: 100%; object-fit: cover; transition: transform .45s var(--ease); }
.product-card:hover .product-photo img { transform: scale(1.045); }
.product-card.has-photo { min-height: 420px; }
.product-card.facility-card { min-height: 0; padding-bottom: 24px; }
.product-card.facility-card p { margin-bottom: 0; }
.product-card.has-photo .product-icon { display: none; }
.product-card.has-photo p { line-height: 1.65; }
.photo-note { display: block; margin-top: 8px; color: #8298a7; font-size: 11px; }
.product-card::before { content: ""; position: absolute; inset: auto -35px -55px auto; width: 150px; height: 150px; background: radial-gradient(circle, rgba(22,184,217,.13), transparent 70%); }
.product-card:hover { transform: translateY(-7px); border-color: rgba(8,132,199,.34); box-shadow: var(--shadow-sm); }
.product-icon { display: grid; place-items: center; width: 58px; height: 58px; margin-bottom: 34px; color: var(--blue-700); background: linear-gradient(145deg, #edfafd, #e2f4f8); border-radius: 16px; }
.product-card h3 { margin-bottom: 12px; font-size: 21px; }
.product-card p { margin-bottom: 22px; font-size: 14px; line-height: 1.75; }
.product-card .text-link { position: absolute; bottom: 27px; left: 30px; font-size: 14px; }
.product-card.is-hidden { display: none; }

.tech-band { position: relative; min-height: 650px; background: #eaf7fc; overflow: hidden; }
.tech-band::after { content: ""; position: absolute; inset: 0; opacity: .78; background: linear-gradient(90deg, #eef9fd 0 43%, rgba(238,249,253,.85) 52%, transparent 78%), url("../images/web-ultrafiltration-plant.jpg") 82% center/cover no-repeat; }
.tech-band::before { content: ""; position: absolute; z-index: 1; inset: 0; opacity: .18; background-image: radial-gradient(circle at 15% 30%, var(--cyan-500) 0 1px, transparent 2px); background-size: 24px 24px; }
.tech-content { position: relative; z-index: 2; display: flex; align-items: center; min-height: 650px; }
.tech-copy { width: 50%; padding: 80px 0; color: var(--navy-950); }
.tech-copy h2 { color: var(--navy-950); }
.tech-copy p { color: var(--muted); }
.tech-points { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 32px; }
.tech-point { padding: 18px; background: rgba(255,255,255,.82); border: 1px solid #d5ebf3; border-radius: 12px; backdrop-filter: blur(10px); }
.tech-point strong { display: block; margin-bottom: 4px; color: var(--blue-700); font-size: 15px; }
.tech-point span { color: var(--muted); font-size: 13px; }

.solution-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.solution-card { position: relative; min-height: 310px; padding: 32px; color: var(--navy-950); background: linear-gradient(145deg, #f4fbfe, #e8f6fb); border: 1px solid #d5ebf3; border-radius: var(--radius); overflow: hidden; }
.solution-card::before { content: ""; position: absolute; top: -40px; right: -40px; width: 150px; height: 150px; border: 1px solid rgba(125,228,239,.18); border-radius: 50%; }
.solution-card::after { content: ""; position: absolute; top: -10px; right: -10px; width: 80px; height: 80px; border: 1px solid rgba(125,228,239,.16); border-radius: 50%; }
.solution-no { display: block; margin-bottom: 56px; color: var(--cyan-300); font-size: 13px; font-weight: 800; }
.solution-card h3 { margin-bottom: 12px; color: var(--navy-950); font-size: 23px; }
.solution-card p { color: var(--muted); font-size: 14px; }
.solution-card .text-link { color: var(--blue-700); }

.process-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; margin-top: 52px; }
.process-item { position: relative; padding: 0 22px; text-align: center; }
.process-item::after { content: ""; position: absolute; top: 32px; right: -10%; width: 20%; height: 1px; background: var(--line); }
.process-item:last-child::after { display: none; }
.process-no { display: grid; place-items: center; width: 66px; height: 66px; margin: 0 auto 20px; color: var(--blue-700); background: var(--aqua-100); border: 1px solid #cfecef; border-radius: 50%; font-size: 15px; font-weight: 800; }
.process-item h3 { margin-bottom: 8px; font-size: 17px; }
.process-item p { margin: 0; font-size: 13px; }

.knowledge-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 24px; }
.knowledge-feature { min-height: 420px; padding: 46px; background: linear-gradient(135deg, #edfafd, #f7fcfd); border: 1px solid #dceef2; border-radius: var(--radius-lg); }
.knowledge-feature h3 { max-width: 560px; margin: 22px 0 16px; font-size: clamp(28px, 3.5vw, 40px); }
.knowledge-list { display: grid; gap: 16px; }
.knowledge-item { display: block; padding: 22px 24px; background: var(--white); border: 1px solid var(--line); border-radius: 14px; transition: border-color .25s, transform .25s; }
.knowledge-item:hover { border-color: var(--cyan-500); transform: translateX(4px); }
.knowledge-item small { color: var(--blue-700); font-weight: 700; }
.knowledge-item h3 { margin: 7px 0 0; font-size: 17px; }

.ai-panel { display: grid; grid-template-columns: .85fr 1.15fr; gap: 72px; align-items: center; padding: 58px; color: var(--white); background: var(--navy-950); border-radius: var(--radius-lg); overflow: hidden; }
.ai-visual { position: relative; min-height: 330px; }
.orbit { position: absolute; inset: 50% auto auto 50%; width: 280px; height: 280px; border: 1px solid rgba(125,228,239,.18); border-radius: 50%; transform: translate(-50%, -50%); }
.orbit::before, .orbit::after { content: ""; position: absolute; border: 1px solid rgba(125,228,239,.18); border-radius: 50%; }
.orbit::before { inset: 35px; }
.orbit::after { inset: 75px; }
.orbit-core { position: absolute; inset: 50% auto auto 50%; display: grid; place-items: center; width: 86px; height: 86px; color: var(--cyan-300); background: rgba(22,184,217,.12); border: 1px solid rgba(125,228,239,.42); border-radius: 50%; transform: translate(-50%, -50%); box-shadow: 0 0 55px rgba(22,184,217,.2); }
.orbit-node { position: absolute; width: 10px; height: 10px; background: var(--cyan-300); border-radius: 50%; box-shadow: 0 0 18px var(--cyan-500); }
.orbit-node.n1 { top: 24px; left: 120px; }
.orbit-node.n2 { right: 15px; bottom: 90px; }
.orbit-node.n3 { bottom: 18px; left: 82px; }
.ai-copy h2 { color: var(--white); }
.ai-copy p { color: rgba(255,255,255,.68); }
.ai-checks { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 22px; margin: 28px 0 0; padding: 0; list-style: none; }
.ai-checks li { display: flex; gap: 9px; color: rgba(255,255,255,.82); font-size: 14px; }
.ai-checks svg { flex: 0 0 auto; margin-top: 5px; color: var(--cyan-300); }

.cta-band { padding: 70px 0; color: var(--white); background: linear-gradient(115deg, var(--blue-700), #0c96bf); }
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 48px; }
.cta-inner h2 { margin-bottom: 10px; color: var(--white); font-size: clamp(28px, 4vw, 44px); }
.cta-inner p { margin: 0; color: rgba(255,255,255,.78); }
.cta-actions { display: flex; gap: 12px; flex: 0 0 auto; }

.site-footer { color: rgba(255,255,255,.68); background: #021523; }
.footer-main { display: grid; grid-template-columns: 1.5fr .7fr .9fr 1.1fr; gap: 70px; padding: 75px 0 58px; }
.footer-brand .brand { color: var(--white); margin-bottom: 22px; }
.footer-brand p { max-width: 380px; color: rgba(255,255,255,.56); font-size: 14px; }
.group-label { display: inline-flex; margin-top: 10px; padding: 6px 10px; color: var(--cyan-300); background: rgba(125,228,239,.08); border: 1px solid rgba(125,228,239,.15); border-radius: 6px; font-size: 12px; }
.footer-col h3 { margin-bottom: 20px; color: var(--white); font-size: 16px; }
.footer-links { display: grid; gap: 11px; }
.footer-links a { font-size: 14px; transition: color .2s; }
.footer-links a:hover { color: var(--cyan-300); }
.footer-contact { display: grid; gap: 12px; font-size: 14px; }
.footer-contact div { display: grid; grid-template-columns: 20px 1fr; gap: 10px; align-items: start; }
.footer-contact svg { margin-top: 4px; color: var(--cyan-300); }
.footer-bottom { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 22px 0; border-top: 1px solid rgba(255,255,255,.08); font-size: 12px; }
.footer-bottom p { margin: 0; color: rgba(255,255,255,.42); }

.page-hero { position: relative; padding: 186px 0 92px; color: var(--navy-950); background: linear-gradient(115deg, #f8fdff, #dff3fb); overflow: hidden; }
.page-hero::after { content: ""; position: absolute; inset: 0; opacity: .18; background-image: radial-gradient(circle at 70% 20%, #75e7f1 0 1px, transparent 2px); background-size: 32px 32px; mask-image: linear-gradient(90deg, transparent 30%, black); }
.page-hero .container { position: relative; z-index: 1; }
.breadcrumbs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 24px; color: #718a9a; font-size: 13px; }
.breadcrumbs a:hover { color: var(--cyan-300); }
.page-hero h1 { margin-bottom: 16px; color: var(--navy-950); font-size: clamp(42px, 6vw, 64px); }
.page-hero p { max-width: 760px; margin: 0; color: var(--muted); font-size: 18px; }
.page-hero .eyebrow { color: var(--blue-700); }

.content-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 70px; align-items: start; }
.prose h2 { margin: 48px 0 18px; font-size: 30px; }
.prose h2:first-child { margin-top: 0; }
.prose h3 { margin: 30px 0 12px; font-size: 21px; }
.prose p, .prose li { color: var(--muted); }
.prose ul, .prose ol { padding-left: 22px; }
.callout { padding: 26px 28px; background: var(--aqua-100); border-left: 4px solid var(--cyan-500); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; }
.callout p:last-child { margin-bottom: 0; }
.principle-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.principle-card { padding: 32px; border: 1px solid var(--line); border-radius: var(--radius); }
.principle-card .product-icon { margin-bottom: 24px; }
.principle-card h3 { font-size: 20px; }
.principle-card p { margin: 0; font-size: 14px; }
.group-panel { position: sticky; top: 110px; padding: 42px; color: var(--white); background: linear-gradient(145deg, var(--navy-950), var(--navy-800)); border-radius: var(--radius-lg); }
.group-panel h2, .group-panel h3 { color: var(--white); }
.group-panel p { color: rgba(255,255,255,.68); }
.group-panel .tag { color: var(--cyan-300); background: rgba(125,228,239,.09); }
.ability-list { display: grid; gap: 16px; margin-top: 28px; }
.ability-item { display: flex; gap: 13px; padding-top: 16px; border-top: 1px solid rgba(255,255,255,.1); }
.ability-item svg { flex: 0 0 auto; color: var(--cyan-300); }
.ability-item strong { display: block; color: var(--white); }
.ability-item span { display: block; color: rgba(255,255,255,.5); font-size: 13px; }

.filter-bar { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 34px; }
.filter-btn { padding: 10px 18px; color: var(--muted); background: var(--white); border: 1px solid var(--line); border-radius: 999px; cursor: pointer; font-weight: 650; transition: .2s; }
.filter-btn:hover, .filter-btn.active { color: var(--white); background: var(--blue-700); border-color: var(--blue-700); }
.product-detail-list { display: grid; gap: 34px; }
.product-detail {
  display: grid;
  grid-template-columns: .68fr 1.32fr;
  gap: 42px;
  padding: 42px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}
.product-detail-visual { position: relative; display: grid; place-items: center; min-height: 290px; color: var(--cyan-300); background: linear-gradient(145deg, var(--navy-950), var(--navy-800)); border-radius: var(--radius); overflow: hidden; }
.product-detail-visual.has-image { background: #eaf7fc; }
.product-detail-visual.has-image::before, .product-detail-visual.has-image::after { display: none; }
.product-detail-visual.has-image img { width: 100%; height: 100%; min-height: 290px; object-fit: cover; }
.product-detail-visual::before, .product-detail-visual::after { content: ""; position: absolute; border: 1px solid rgba(125,228,239,.15); border-radius: 50%; }
.product-detail-visual::before { width: 220px; height: 220px; }
.product-detail-visual::after { width: 145px; height: 145px; }
.product-detail-visual svg { position: relative; z-index: 1; width: 70px; height: 70px; }
.product-detail h2 { margin: 12px 0 14px; font-size: 30px; }
.product-detail h3 { margin: 22px 0 10px; font-size: 17px; }
.spec-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.spec-tags span { padding: 6px 10px; color: var(--blue-700); background: var(--aqua-100); border-radius: 6px; font-size: 12px; font-weight: 700; }
.application-list { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 18px; padding: 0; list-style: none; }
.application-list li { position: relative; padding-left: 17px; color: var(--muted); font-size: 14px; }
.application-list li::before { content: ""; position: absolute; top: .72em; left: 0; width: 6px; height: 6px; background: var(--cyan-500); border-radius: 50%; }

.solution-detail-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.solution-detail-card { padding: 38px; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); }
.solution-detail-card .solution-no { margin-bottom: 26px; color: var(--blue-700); }
.solution-detail-card h2 { font-size: 26px; }
.solution-detail-card h3 { margin: 24px 0 10px; font-size: 16px; }
.solution-detail-card ul { margin: 0; padding-left: 20px; color: var(--muted); font-size: 14px; }
.flow-line { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 20px; }
.flow-line span { padding: 6px 10px; color: var(--navy-800); background: var(--soft); border: 1px solid var(--line); border-radius: 6px; font-size: 12px; }
.flow-line b { color: var(--cyan-500); font-weight: 800; }

.service-stage { display: grid; grid-template-columns: 120px 1fr; gap: 34px; padding: 34px 0; border-bottom: 1px solid var(--line); }
.service-stage:first-child { padding-top: 0; }
.stage-no { color: var(--blue-700); font-size: 42px; font-weight: 250; line-height: 1; }
.service-stage h2 { margin-bottom: 10px; font-size: 25px; }
.service-stage p { margin-bottom: 12px; }
.stage-output { color: var(--success); font-size: 13px; font-weight: 700; }

.faq-layout { display: grid; grid-template-columns: .65fr 1.35fr; gap: 70px; align-items: start; }
.faq-intro { position: sticky; top: 115px; }
.faq-list { border-top: 1px solid var(--line); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-question { display: flex; align-items: center; justify-content: space-between; width: 100%; padding: 24px 0; text-align: left; background: none; border: 0; cursor: pointer; font-weight: 750; }
.faq-question svg { flex: 0 0 auto; transition: transform .25s; }
.faq-item.open .faq-question { color: var(--blue-700); }
.faq-item.open .faq-question svg { transform: rotate(45deg); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height .35s var(--ease); }
.faq-answer p { padding: 0 42px 23px 0; margin: 0; font-size: 14px; }
.article-index { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.article-card { padding: 30px; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); }
.article-card h3 { margin: 16px 0 12px; font-size: 20px; }
.article-card p { font-size: 14px; }

.contact-card { padding: 35px; background: var(--navy-950); border-radius: var(--radius-lg); }
.contact-card-simple { max-width: 760px; margin: 0 auto; }
.contact-card h2, .contact-card h3 { color: var(--white); }
.contact-card > p { color: rgba(255,255,255,.6); }
.contact-methods { display: grid; gap: 15px; margin: 28px 0; }
.contact-method { display: grid; grid-template-columns: 45px 1fr; gap: 14px; align-items: center; padding: 16px; background: rgba(255,255,255,.055); border: 1px solid rgba(255,255,255,.08); border-radius: 12px; }
.contact-method svg { color: var(--cyan-300); }
.contact-method span { display: block; color: rgba(255,255,255,.48); font-size: 12px; }
.contact-method strong { color: var(--white); font-size: 14px; }
.checklist { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; counter-reset: item; }
.checklist-item { position: relative; padding: 28px 24px 24px; background: var(--soft); border-radius: var(--radius); }
.checklist-item::before { counter-increment: item; content: "0" counter(item); display: block; margin-bottom: 18px; color: var(--cyan-500); font-weight: 800; }
.checklist-item h3 { font-size: 17px; }
.checklist-item p { margin: 0; font-size: 13px; }

.reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.visible { opacity: 1; transform: none; }

@media (max-width: 1080px) {
  :root { --header-h: 70px; }
  .main-nav a { padding-inline: 10px; font-size: 14px; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-main { grid-template-columns: 1.5fr 1fr 1fr; gap: 44px; }
  .footer-col:last-child { grid-column: 1 / -1; }
  .tech-copy { width: 55%; }
}

@media (max-width: 820px) {
  .section { padding: 78px 0; }
  .site-header { background: rgba(255,255,255,.96); backdrop-filter: blur(12px); }
  .site-header.scrolled, .site-header.inner-header { background: rgba(255,255,255,.97); }
  .menu-toggle { display: block; }
  .main-nav {
    position: fixed;
    inset: var(--header-h) 0 auto;
    display: grid;
    align-content: start;
    gap: 0;
    max-height: 0;
    color: var(--navy-950);
    background: var(--white);
    box-shadow: var(--shadow-lg);
    visibility: hidden;
    overflow: hidden;
    transition: max-height .35s var(--ease), visibility 0s linear .35s;
  }
  .main-nav.open { max-height: calc(100vh - var(--header-h)); visibility: visible; overflow-y: auto; transition-delay: 0s; }
  .main-nav a { padding: 16px 24px; border-bottom: 1px solid var(--line); }
  .main-nav a::after { display: none; }
  .hero, .hero-inner { min-height: 700px; }
  .hero-content { padding-top: 95px; }
  .hero-index { margin-top: 0; background: var(--white); }
  .index-panel { grid-template-columns: 1fr 1fr; border-radius: 0; box-shadow: none; }
  .index-item { border-bottom: 1px solid var(--line); }
  .about-grid, .content-grid, .knowledge-grid, .ai-panel, .faq-layout { grid-template-columns: 1fr; gap: 48px; }
  .about-visual { min-height: 460px; }
  .solution-grid { grid-template-columns: 1fr 1fr; }
  .process-grid { grid-template-columns: 1fr 1fr; gap: 34px 0; }
  .process-item::after { display: none; }
  .tech-band::after { opacity: .18; background-position: center; }
  .tech-copy { width: 76%; }
  .ai-panel { padding: 42px; }
  .ai-visual { order: 2; min-height: 280px; }
  .cta-inner { align-items: flex-start; flex-direction: column; }
  .footer-main { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-col:last-child { grid-column: auto; }
  .principle-grid, .article-index, .checklist { grid-template-columns: 1fr 1fr; }
  .group-panel, .faq-intro { position: static; }
  .product-detail { grid-template-columns: 1fr; }
  .solution-detail-grid { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .container, .narrow { width: min(calc(100% - 28px), var(--container)); }
  .section { padding: 64px 0; }
  .brand-cn { font-size: 16px; }
  .brand-en { letter-spacing: .08em; }
  .brand-mark { width: 43px; height: 43px; flex-basis: 43px; }
  .hero { min-height: 680px; background-position: 62% center; }
  .hero-inner { min-height: 680px; }
  .hero::before { background: linear-gradient(90deg, rgba(255,255,255,.98), rgba(240,249,253,.76)); }
  .hero h1 { font-size: 42px; }
  .hero-copy { font-size: 16px; }
  .hero-actions, .cta-actions { width: 100%; flex-direction: column; }
  .hero-actions .btn, .cta-actions .btn { width: 100%; }
  .hero-notes { display: grid; gap: 10px; }
  .hero-side-label { display: none; }
  .index-panel, .product-grid, .solution-grid, .tech-points, .principle-grid, .article-index, .checklist { grid-template-columns: 1fr; }
  .index-item { min-height: auto; border-right: 0; }
  .section-head.row { align-items: flex-start; flex-direction: column; }
  .about-visual { min-height: 380px; }
  .about-image-main { inset: 0 28px 55px 0; }
  .about-caption { width: 190px; padding: 18px; }
  .product-card { min-height: 286px; }
  .tech-band, .tech-content { min-height: 690px; }
  .tech-copy { width: 100%; }
  .process-grid { grid-template-columns: 1fr; }
  .process-item { display: grid; grid-template-columns: 58px 1fr; gap: 16px; text-align: left; }
  .process-no { width: 52px; height: 52px; margin: 0; }
  .ai-panel { padding: 30px 22px; }
  .ai-checks { grid-template-columns: 1fr; }
  .orbit { width: 240px; height: 240px; }
  .footer-main { grid-template-columns: 1fr; padding: 58px 0 42px; }
  .footer-brand, .footer-col:last-child { grid-column: auto; }
  .footer-bottom { align-items: flex-start; flex-direction: column; }
  .page-hero { padding: 150px 0 70px; }
  .product-detail { padding: 24px; }
  .product-detail-visual { min-height: 220px; }
  .application-list { grid-template-columns: 1fr; }
  .solution-detail-card { padding: 28px 24px; }
  .service-stage { grid-template-columns: 64px 1fr; gap: 18px; }
  .stage-no { font-size: 32px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
  .reveal { opacity: 1; transform: none; }
}