:root {
  --ink: #122028;
  --ink-soft: #253640;
  --muted: #64737b;
  --paper: #f4f2ec;
  --white: #fff;
  --orange: #ef6b2e;
  --orange-dark: #c74d18;
  --cyan: #68d5cf;
  --blue: #08778b;
  --blue-dark: #07303b;
  --line: rgba(18, 32, 40, .13);
  --radius: 24px;
  --shadow: 0 26px 70px rgba(7, 35, 43, .14);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif; line-height: 1.7; }
body, button { font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
a:focus-visible, button:focus-visible { outline: 3px solid var(--orange); outline-offset: 4px; }
.skip-link { position: fixed; z-index: 100; top: 10px; left: 10px; padding: 10px 14px; color: var(--white); background: var(--ink); border-radius: 10px; transform: translateY(-150%); }
.skip-link:focus { transform: none; }

.site-header, .article-header { position: sticky; z-index: 30; top: 0; display: flex; min-height: 74px; align-items: center; justify-content: space-between; gap: 30px; padding: 11px clamp(20px, 5vw, 72px); background: rgba(247, 246, 241, .94); border-bottom: 1px solid rgba(18, 32, 40, .08); backdrop-filter: blur(18px); }
.brand { display: inline-flex; align-items: center; gap: 12px; flex: none; }
.brand-mark { display: grid; width: 44px; height: 44px; place-items: center; color: var(--white); background: linear-gradient(145deg, var(--orange), #f39a4d); border-radius: 13px 13px 13px 5px; font: 900 22px/1 Arial, sans-serif; box-shadow: 0 10px 22px rgba(239, 107, 46, .25); }
.brand strong, .brand small { display: block; }
.brand strong { font-size: 17px; letter-spacing: .06em; }
.brand small { color: var(--muted); font-size: 9px; letter-spacing: .16em; }
nav { display: flex; align-items: center; gap: clamp(16px, 2vw, 30px); font-size: 14px; }
nav a { white-space: nowrap; }
nav a:hover { color: var(--blue); }
.nav-phone { display: inline-flex; align-items: center; gap: 7px; padding-left: 18px; border-left: 1px solid rgba(18, 32, 40, .16); color: var(--ink); }
.nav-phone span { color: var(--orange); font-size: 12px; font-weight: 800; }
.nav-phone strong { font-size: 16px; letter-spacing: .025em; }
.nav-phone:hover strong { color: var(--orange); }
.nav-cta { padding: 9px 17px; color: var(--white); background: var(--ink); border-radius: 999px; }
.nav-cta:hover { color: var(--white); background: var(--blue); }
.menu-toggle { display: none; padding: 8px 0; color: var(--ink); border: 0; background: none; font-size: 15px; }

.hero { position: relative; min-height: min(820px, calc(100vh - 74px)); overflow: hidden; color: var(--white); background: #12191d; }
.hero-image { position: absolute; top: 0; right: 0; width: 52%; height: 100%; object-fit: cover; object-position: center 30%; }
.hero-shade { position: absolute; inset: 0; background: linear-gradient(90deg, #0a1115 0%, #0a1115 45%, rgba(10,17,21,.90) 53%, rgba(10,17,21,.08) 78%, rgba(10,17,21,.02) 100%), linear-gradient(0deg, rgba(6, 16, 21, .34), transparent 42%); }
.hero-copy { position: relative; z-index: 2; display: flex; width: 58%; min-height: min(820px, calc(100vh - 74px)); flex-direction: column; justify-content: center; padding: 78px 30px 68px clamp(24px, 7vw, 110px); }
.eyebrow { margin: 0 0 15px; color: var(--blue); font-size: 12px; font-weight: 900; letter-spacing: .2em; }
.hero .eyebrow { color: var(--cyan); }
.hero h1 { margin: 0; font-size: clamp(45px, 5.6vw, 82px); line-height: 1.08; letter-spacing: -.045em; }
.hero h1 span { color: #dfe9ea; font-size: .68em; letter-spacing: -.03em; }
.hero-lead { max-width: 690px; margin: 28px 0 30px; color: rgba(255, 255, 255, .72); font-size: 18px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.button { display: inline-flex; min-height: 49px; align-items: center; justify-content: center; padding: 0 23px; border-radius: 999px; font-weight: 800; }
.button.primary { color: var(--white); background: var(--orange); box-shadow: 0 14px 34px rgba(239, 107, 46, .25); }
.button.primary:hover { background: var(--orange-dark); }
.button.ghost { color: var(--white); border: 1px solid rgba(255,255,255,.30); background: rgba(255,255,255,.08); backdrop-filter: blur(8px); }
.hero-trust { display: flex; max-width: 700px; flex-wrap: wrap; gap: 0; margin: 48px 0 0; padding: 0; list-style: none; }
.hero-trust li { display: flex; min-width: 145px; align-items: center; gap: 10px; padding: 6px 24px; border-left: 1px solid rgba(255,255,255,.18); }
.hero-trust li:first-child { padding-left: 0; border-left: 0; }
.hero-trust b { color: var(--orange); font-size: 11px; }
.hero-trust span { color: rgba(255,255,255,.78); font-size: 14px; font-weight: 700; }
.visual-note { position: absolute; z-index: 2; right: 24px; bottom: 18px; margin: 0; color: rgba(255,255,255,.48); font-size: 11px; }

.fact-bar { display: grid; grid-template-columns: repeat(4, 1fr); padding: 0 clamp(24px, 7vw, 110px); color: var(--white); background: var(--blue-dark); }
.fact-bar p { margin: 0; padding: 24px 28px; border-left: 1px solid rgba(255,255,255,.10); }
.fact-bar p:first-child { border-left: 0; }
.fact-bar span, .fact-bar strong { display: block; }
.fact-bar span { color: rgba(255,255,255,.55); font-size: 11px; }
.fact-bar strong { margin-top: 2px; font-size: 18px; }

.section { padding: 108px clamp(24px, 7vw, 110px); }
.section-heading { max-width: 760px; margin-bottom: 48px; }
.split-heading { display: grid; max-width: none; grid-template-columns: 1fr minmax(320px, .7fr); gap: 80px; align-items: end; }
.section-heading h2 { margin: 0; font-size: clamp(34px, 4vw, 57px); line-height: 1.15; letter-spacing: -.035em; }
.section-heading > p:last-child, .split-heading > p { margin: 0; color: var(--muted); font-size: 17px; }
.light .eyebrow { color: var(--cyan); }
.light h2 { color: var(--white); }
.light > p:last-child { color: rgba(255,255,255,.62); }

.strength-section { background: #f6f4ee; }
.capability-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.capability-grid article { position: relative; min-height: 340px; overflow: hidden; color: var(--white); background: #18313a; border: 1px solid rgba(18,32,40,.07); border-radius: 18px; box-shadow: 0 15px 40px rgba(10, 43, 52, .08); }
.capability-grid article::after { position: absolute; inset: 30% 0 0; content: ""; background: linear-gradient(0deg, rgba(4,17,22,.95), rgba(4,17,22,0)); }
.capability-grid img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; }
.capability-grid .qualification-card img { object-position: 73% center; }
.capability-grid .showroom-card img { filter: brightness(1.2); }
.capability-grid .showroom-card::after { background: linear-gradient(0deg, rgba(4,17,22,.86), rgba(4,17,22,.02)); }
.capability-grid article:hover img { transform: scale(1.035); }
.capability-grid article > div { position: absolute; z-index: 2; right: 0; bottom: 0; left: 0; padding: 26px; }
.capability-grid span { color: var(--orange); font-size: 11px; font-weight: 900; }
.capability-grid h3 { margin: 8px 0 4px; font-size: 22px; }
.capability-grid p { margin: 0; color: rgba(255,255,255,.65); font-size: 13px; }

.delivery-section { color: var(--white); background: linear-gradient(135deg, #071f28, #0a3d4a); }
.delivery-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.delivery-card { position: relative; min-height: 380px; overflow: hidden; background: #102f39; border: 1px solid rgba(255,255,255,.13); border-radius: 18px; box-shadow: 0 18px 50px rgba(0,0,0,.17); }
.delivery-card::after { position: absolute; inset: 22% 0 0; content: ""; background: linear-gradient(0deg, rgba(3,18,24,.97) 0%, rgba(3,18,24,.7) 45%, rgba(3,18,24,0) 100%); }
.delivery-card img { width: 100%; height: 100%; object-fit: cover; transition: transform .55s ease, filter .55s ease; }
.delivery-card:hover img { transform: scale(1.035); filter: saturate(1.06); }
.delivery-card > div { position: absolute; z-index: 2; right: 0; bottom: 0; left: 0; padding: 26px; }
.delivery-card small { color: var(--cyan); font-size: 11px; font-weight: 900; letter-spacing: .09em; }
.delivery-card h3 { margin: 10px 0 8px; font-size: 23px; }
.delivery-card p { margin: 0; color: rgba(255,255,255,.68); font-size: 13px; line-height: 1.75; }

.product-section { background: #eceae4; }
.product-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px; }
.product-card { display: grid; min-height: 430px; grid-template-columns: .92fr 1.08fr; overflow: hidden; background: var(--white); border-radius: var(--radius); box-shadow: var(--shadow); scroll-margin-top: 94px; }
.product-card.reverse figure { order: 2; }
.product-card figure { min-width: 0; min-height: 430px; margin: 0; overflow: hidden; background: #e7eef0; }
.product-card figure img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s ease; }
.product-card:hover figure img { transform: scale(1.025); }
.product-copy { display: flex; min-width: 0; flex-direction: column; align-items: flex-start; justify-content: center; padding: clamp(26px, 3vw, 44px); }
.product-code { color: var(--orange); font-size: 10px; font-weight: 900; letter-spacing: .18em; }
.product-copy h3 { margin: 10px 0 14px; font-size: clamp(25px, 2vw, 34px); line-height: 1.2; }
.product-copy p { margin: 0; color: var(--muted); }
.product-copy ul { display: flex; flex-wrap: wrap; gap: 8px; margin: 24px 0; padding: 0; list-style: none; }
.product-copy li { padding: 6px 10px; color: var(--ink-soft); background: #eef3f2; border-radius: 999px; font-size: 11px; }
.product-copy a { margin-top: auto; color: var(--blue); font-weight: 800; }

.qualification-section { display: grid; grid-template-columns: .75fr 1.05fr; gap: clamp(42px, 7vw, 100px); align-items: center; background: #f7f6f1; }
.qualification-image { position: relative; max-height: 650px; overflow: hidden; background: var(--white); border-radius: var(--radius); box-shadow: var(--shadow); }
.qualification-image img { width: 100%; height: 650px; object-fit: cover; object-position: top; }
.qualification-copy h2 { margin: 0 0 18px; font-size: clamp(36px, 4vw, 58px); line-height: 1.15; }
.qualification-copy > p:not(.eyebrow) { color: var(--muted); font-size: 17px; }
.qualification-copy dl { margin: 34px 0 0; }
.qualification-copy dl div { display: grid; grid-template-columns: 130px 1fr; padding: 13px 0; border-top: 1px solid var(--line); }
.qualification-copy dt { color: var(--muted); }
.qualification-copy dd { margin: 0; font-weight: 800; }
.qualification-actions { display: flex; align-items: center; gap: 22px; margin-top: 30px; }
.text-link { color: var(--blue); font-weight: 800; }

.service-section { background: var(--white); }
.process-list { display: grid; grid-template-columns: repeat(5, 1fr); margin: 0; padding: 0; list-style: none; }
.process-list li { min-height: 210px; padding: 24px; border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.process-list li:first-child { border-left: 0; }
.process-list b { color: var(--orange); font-size: 11px; }
.process-list h3 { margin: 50px 0 8px; font-size: 20px; }
.process-list p { margin: 0; color: var(--muted); font-size: 13px; }

.knowledge-section { background: #e8efed; }
.article-grid { display: grid; grid-template-columns: 1.15fr 1fr; gap: 20px; }
.article-grid article { display: flex; min-height: 320px; flex-direction: column; align-items: flex-start; padding: 36px; background: var(--white); border-radius: 20px; }
.article-grid .featured-article { color: var(--white); background: linear-gradient(145deg, var(--blue), var(--blue-dark)); }
.tag { padding: 6px 10px; color: var(--blue); background: #e5f4f3; border-radius: 999px; font-size: 11px; font-weight: 800; }
.featured-article .tag { color: var(--white); background: rgba(255,255,255,.14); }
.article-grid h3 { max-width: 520px; margin: 44px 0 14px; font-size: 26px; line-height: 1.35; }
.article-grid p { margin: 0; color: var(--muted); }
.featured-article p { color: rgba(255,255,255,.7); }
.article-grid a { margin-top: auto; color: var(--blue); font-weight: 800; }
.featured-article a { color: var(--cyan); }

.faq-section { background: #f7f6f1; }
.faq-list { display: grid; max-width: 1050px; gap: 12px; }
.faq-list details { padding: 22px 26px; background: var(--white); border: 1px solid var(--line); border-radius: 16px; box-shadow: 0 8px 25px rgba(10, 43, 52, .05); }
.faq-list summary { cursor: pointer; font-size: 18px; font-weight: 800; }
.faq-list details[open] summary { color: var(--blue); }
.faq-list p { margin: 14px 0 0; color: var(--muted); }
.faq-list a { color: var(--blue); font-weight: 800; }

.contact-section { display: grid; grid-template-columns: 1fr .8fr; gap: 80px; align-items: center; padding: 92px clamp(24px, 7vw, 110px); color: var(--white); background: linear-gradient(120deg, #0a5364, #082c36); }
.contact-section h2 { margin: 0; font-size: clamp(34px, 4vw, 56px); line-height: 1.2; }
.contact-section .eyebrow { color: var(--cyan); }
.contact-section > div > p:last-child { color: rgba(255,255,255,.68); }
.contact-card { padding: 34px; background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.16); border-radius: 18px; }
.contact-card span { display: block; color: var(--cyan); font-size: 11px; }
.contact-card strong { display: block; margin: 8px 0 24px; font-size: 22px; }
.contact-card p { margin: 8px 0 0; color: rgba(255,255,255,.68); }
.contact-card p + span { margin-top: 24px; }
.contact-phone { color: var(--white); font-size: 20px; font-weight: 900; }
.contact-phone:hover { color: var(--cyan); }
footer { display: flex; justify-content: space-between; gap: 20px; align-items: center; padding: 30px clamp(24px, 7vw, 110px); color: rgba(255,255,255,.55); background: #061b22; font-size: 12px; }
.footer-brand strong, .footer-brand span { display: block; }
.footer-brand strong { color: var(--white); font-size: 15px; }

[data-reveal] { opacity: 1; transform: none; }
.js [data-reveal] { opacity: 1; transform: none; }

/* Content pages */
.article-page { background: #f7f6f2; }
.article-header { position: relative; }
.back-link { color: var(--blue); font-size: 14px; font-weight: 800; }
.article-main { padding: 80px 24px 120px; }
.article-main article { max-width: 850px; margin: 0 auto; }
.article-main h1 { max-width: 800px; margin: 8px 0 24px; font-size: clamp(40px, 6vw, 72px); line-height: 1.12; letter-spacing: -.045em; }
.article-lead { color: var(--muted); font-size: 20px; }
.article-meta { margin: 30px 0 60px; padding-bottom: 22px; color: var(--muted); border-bottom: 1px solid var(--line); font-size: 13px; }
.article-main h2 { margin: 50px 0 14px; font-size: 28px; }
.article-main p { color: #42515a; font-size: 17px; }
.article-main table { width: 100%; margin: 28px 0; overflow: hidden; background: var(--white); border-collapse: collapse; border-radius: 16px; box-shadow: var(--shadow); }
.article-main th, .article-main td { padding: 16px 20px; text-align: left; border-bottom: 1px solid var(--line); }
.article-main th { width: 160px; color: var(--muted); font-weight: 500; }
.article-main td { font-weight: 700; }
.source-box { margin-top: 56px; padding: 28px; background: #e5f3f2; border-radius: 16px; }
.source-box p { margin: 6px 0; }
.source-box a { color: var(--blue); font-weight: 800; }

@media (max-width: 1100px) {
  .capability-grid, .delivery-grid { grid-template-columns: repeat(2, 1fr); }
  .product-grid { grid-template-columns: 1fr; }
  .process-list { grid-template-columns: repeat(3, 1fr); }
  .process-list li:nth-child(4) { border-left: 0; }
}

@media (max-width: 820px) {
  .site-header { flex-wrap: wrap; }
  .menu-toggle { display: block; margin-left: auto; padding: 8px 14px; color: var(--white); background: var(--ink); border-radius: 999px; font-weight: 800; }
  nav { display: none; width: 100%; flex-direction: column; align-items: stretch; gap: 4px; padding: 12px 0 6px; }
  nav.open { display: flex; }
  nav a { padding: 8px 0; }
  .nav-phone { justify-content: center; padding: 11px 16px; border: 1px solid rgba(239, 107, 46, .26); background: rgba(239, 107, 46, .07); border-radius: 12px; }
  .nav-cta { padding: 10px 16px; text-align: center; }
  .hero, .hero-copy { min-height: 700px; }
  .hero-copy { width: 100%; }
  .hero-shade { background: linear-gradient(90deg, rgba(7,14,18,.93), rgba(7,14,18,.61)), linear-gradient(0deg, rgba(7,14,18,.6), transparent); }
  .hero-image { width: 100%; object-position: center 30%; }
  .fact-bar { grid-template-columns: repeat(2, 1fr); }
  .fact-bar p:nth-child(3) { border-left: 0; }
  .split-heading, .qualification-section, .contact-section { grid-template-columns: 1fr; gap: 36px; }
  .product-card { grid-template-columns: 1fr; }
  .product-card.reverse figure { order: 0; }
  .product-card figure { min-height: 360px; }
  .qualification-image img { height: 520px; }
  .article-grid { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  body { overflow-wrap: anywhere; }
  .brand small { display: none; }
  .hero, .hero-copy { min-height: 680px; }
  .hero-copy { padding-top: 54px; }
  .hero h1 { font-size: 42px; }
  .hero h1 span { font-size: .64em; }
  .hero-lead { font-size: 16px; }
  .hero-trust { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 36px; }
  .hero-trust li { min-width: 0; padding: 5px 0; border: 0; }
  .visual-note { right: 12px; bottom: 10px; font-size: 9px; }
  .fact-bar { padding: 0 16px; }
  .fact-bar p { padding: 18px 14px; }
  .fact-bar strong { font-size: 15px; }
  .section { padding: 78px 20px; }
  .section-heading h2 { font-size: 36px; }
  .capability-grid, .delivery-grid, .process-list { grid-template-columns: 1fr; }
  .delivery-card { min-height: 340px; }
  .product-card figure { min-height: 280px; }
  .product-copy { min-height: 390px; padding: 30px 24px; }
  .qualification-image img { height: 430px; }
  .qualification-copy dl div { grid-template-columns: 1fr; gap: 4px; }
  .qualification-actions { align-items: flex-start; flex-direction: column; }
  .process-list li, .process-list li:nth-child(4) { min-height: 160px; padding-left: 0; border-left: 0; }
  .process-list h3 { margin-top: 24px; }
  .contact-section { padding: 76px 20px; }
  footer { flex-direction: column; align-items: flex-start; }
  .article-main th, .article-main td { display: block; width: auto; }
  .article-main th { padding-bottom: 0; border-bottom: 0; }
  .article-main td { padding-top: 3px; }
  .faq-list details { padding: 19px 20px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js [data-reveal] { opacity: 1; transform: none; transition: none; }
  .product-card figure img, .delivery-card img { transition: none; }
}