/* 新秩序工业主义：本CSS以工程蓝、金属灰、安全黄、BIM坐标线、斜切工业卡片和认证章式信息块作为统一视觉语言。 */
:root {
  --ink: #0b1420;
  --steel: #172433;
  --steel-2: #213348;
  --blue: #0b5fb3;
  --blue-deep: #073b72;
  --cyan: #2bb6ff;
  --yellow: #f7c948;
  --paper: #f4f7fa;
  --line: rgba(123, 155, 190, 0.28);
  --muted: #5d6f83;
  --white: #ffffff;
  --shadow: 0 28px 80px rgba(2, 12, 27, 0.18);
  --radius: 18px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  color: var(--ink);
  background:
    linear-gradient(90deg, rgba(11, 95, 179, 0.06) 1px, transparent 1px),
    linear-gradient(0deg, rgba(11, 95, 179, 0.05) 1px, transparent 1px),
    var(--paper);
  background-size: 44px 44px, 44px 44px, auto;
  font-size: 16px;
  line-height: 1.75;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  min-height: 74px;
  padding: 12px clamp(18px, 4vw, 56px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  background: rgba(244, 247, 250, 0.88);
  border-bottom: 1px solid rgba(13, 44, 76, 0.12);
  backdrop-filter: blur(18px);
}
.brand { display: flex; align-items: center; gap: 12px; min-width: 250px; }
.brand-mark {
  width: 48px; height: 48px; display: grid; place-items: center;
  color: var(--white); font-weight: 900; letter-spacing: -0.04em;
  background: linear-gradient(135deg, var(--blue), var(--blue-deep));
  clip-path: polygon(0 0, 86% 0, 100% 26%, 100% 100%, 14% 100%, 0 74%);
  box-shadow: 0 16px 34px rgba(11, 95, 179, 0.28);
}
.brand-copy { display: grid; line-height: 1.15; }
.brand-copy strong { font-size: 20px; letter-spacing: 0.08em; color: var(--steel); }
.brand-copy small { color: var(--muted); font-size: 12px; }
.main-nav { display: flex; align-items: center; gap: 4px; }
.nav-link {
  padding: 10px 14px; border: 1px solid transparent; color: #294056; font-size: 14px;
  transition: color .2s ease, border-color .2s ease, background .2s ease, transform .2s ease;
}
.nav-link:hover, .nav-link.active { color: var(--blue-deep); border-color: rgba(11, 95, 179, .2); background: rgba(255,255,255,.72); transform: translateY(-1px); }
.nav-toggle { display: none; border: 0; background: var(--steel); color: var(--white); padding: 10px 14px; font-size: 18px; }
.hero-section {
  position: relative; min-height: 82vh; overflow: hidden; display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(280px, .72fr); align-items: center;
  gap: clamp(28px, 5vw, 72px); padding: clamp(92px, 12vw, 150px) clamp(20px, 5vw, 72px) clamp(72px, 9vw, 120px);
  background: #081626; color: var(--white);
}
.hero-video, .hero-overlay { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-video { object-fit: cover; opacity: .34; filter: saturate(.74) contrast(1.1); }
.hero-overlay { background: radial-gradient(circle at 78% 30%, rgba(43,182,255,.2), transparent 30%), linear-gradient(110deg, rgba(3, 12, 24, .96), rgba(8, 22, 38, .78) 55%, rgba(5, 17, 31, .92)); }
.hero-section::after, .page-hero::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image: linear-gradient(rgba(255,255,255,.08) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.07) 1px, transparent 1px);
  background-size: 56px 56px; mask-image: linear-gradient(to bottom, #000, transparent 88%);
}
.hero-content, .hero-gallery { position: relative; z-index: 2; }
.eyebrow { margin: 0 0 12px; color: var(--yellow); font-weight: 800; letter-spacing: .18em; text-transform: uppercase; font-size: 13px; }
h1, h2, h3 { margin: 0; line-height: 1.16; color: inherit; }
h1 { font-size: clamp(38px, 7vw, 78px); letter-spacing: -0.065em; max-width: 980px; }
h2 { font-size: clamp(28px, 4vw, 48px); letter-spacing: -0.045em; }
h3 { font-size: clamp(20px, 2.4vw, 26px); letter-spacing: -0.026em; }
.hero-lead { max-width: 720px; color: rgba(255,255,255,.82); font-size: clamp(17px, 2.1vw, 22px); margin: 24px 0 0; }
.cta-row { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 12px 22px;
  font-weight: 850; letter-spacing: .04em; clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 14px 100%, 0 calc(100% - 14px));
  transition: transform .22s ease, box-shadow .22s ease, background .22s ease;
}
.btn:hover { transform: translateY(-3px); box-shadow: 0 22px 46px rgba(0,0,0,.26); }
.btn.primary { background: var(--yellow); color: #17202b; }
.btn.secondary { background: rgba(255,255,255,.12); color: var(--white); border: 1px solid rgba(255,255,255,.26); }
.hero-gallery { min-height: 460px; border: 1px solid rgba(255,255,255,.18); box-shadow: var(--shadow); clip-path: polygon(0 0, 92% 0, 100% 10%, 100% 100%, 8% 100%, 0 90%); }
.hero-gallery img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: 0; animation: industrialSlide 15s infinite; }
.hero-gallery img:nth-child(2) { animation-delay: 5s; }
.hero-gallery img:nth-child(3) { animation-delay: 10s; }
@keyframes industrialSlide { 0%, 30% { opacity: 1; transform: scale(1.03); } 36%, 100% { opacity: 0; transform: scale(1.12); } }
.section { padding: clamp(68px, 8vw, 118px) clamp(20px, 5vw, 72px); position: relative; }
.section.alt { background: linear-gradient(135deg, rgba(9, 36, 64, .96), rgba(13, 61, 105, .94)); color: var(--white); }
.section-head { max-width: 860px; margin-bottom: 34px; }
.section-head p:not(.eyebrow) { color: var(--muted); font-size: 17px; }
.alt .section-head p:not(.eyebrow) { color: rgba(255,255,255,.76); }
.cards { display: grid; gap: 24px; }
.cards.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.industrial-card {
  background: rgba(255,255,255,.86); border: 1px solid rgba(11, 95, 179, .14); padding: 16px; min-height: 100%;
  box-shadow: 0 18px 50px rgba(10, 31, 57, .1); clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.industrial-card:hover { transform: translateY(-8px); border-color: rgba(11,95,179,.34); box-shadow: 0 26px 70px rgba(10,31,57,.18); }
.industrial-card img { height: 210px; width: 100%; object-fit: cover; margin-bottom: 18px; }
.industrial-card p { color: #52657a; }
.industrial-card span { display: inline-flex; margin-top: 8px; padding: 6px 10px; background: rgba(247,201,72,.16); color: #8a6400; font-weight: 800; font-size: 13px; }
.tab-shell { display: grid; grid-template-columns: 300px minmax(0, 1fr); gap: 24px; align-items: stretch; }
.tab-buttons { display: grid; gap: 10px; }
.tab-button { text-align: left; padding: 16px 18px; background: rgba(255,255,255,.08); color: rgba(255,255,255,.86); border: 1px solid rgba(255,255,255,.16); font: inherit; }
.tab-button.active, .tab-button:hover { background: var(--yellow); color: #16202d; }
.tab-panel { display: none; padding: 34px; min-height: 220px; background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.18); }
.tab-panel.active { display: block; }
.split { display: grid; grid-template-columns: minmax(0, .76fr) minmax(280px, 1fr); gap: clamp(28px, 5vw, 70px); align-items: center; }
.text-link { display: inline-flex; margin-top: 18px; color: var(--blue); font-weight: 900; border-bottom: 2px solid var(--yellow); }
.case-map, .article-image { width: 100%; border: 1px solid rgba(13,44,76,.12); box-shadow: var(--shadow); }
.credential-wall { background: #111d2a; color: var(--white); }
.stamp-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.stamp-grid span { display: grid; place-items: center; min-height: 112px; border: 2px solid rgba(247,201,72,.62); color: var(--yellow); font-weight: 900; letter-spacing: .08em; background: rgba(255,255,255,.05); }
.page-hero { position: relative; overflow: hidden; padding: clamp(100px, 13vw, 158px) clamp(20px, 5vw, 72px) clamp(58px, 8vw, 94px); background: linear-gradient(118deg, #081626, #0d3158); color: var(--white); }
.page-hero p:last-child { max-width: 900px; color: rgba(255,255,255,.78); font-size: 18px; }
.article-layout { max-width: 1180px; margin-inline: auto; }
.article { background: rgba(255,255,255,.9); padding: clamp(22px, 4vw, 46px); border: 1px solid rgba(11,95,179,.12); box-shadow: 0 20px 70px rgba(10,31,57,.1); }
.article p { color: #3f5266; margin: 16px 0; }
.article h2 { margin-top: 34px; }
.article-image { max-height: 430px; object-fit: cover; margin-bottom: 26px; }
.related { margin-top: 34px; padding: 22px; background: #eff4f9; border-left: 4px solid var(--yellow); }
.related a { display: block; color: var(--blue-deep); font-weight: 850; margin-top: 10px; }
.magnifier-card { position: relative; overflow: hidden; margin: 16px 0 28px; border: 1px solid rgba(11,95,179,.2); cursor: zoom-in; background-repeat: no-repeat; background-size: 220%; }
.magnifier-card img { width: 100%; max-height: 420px; object-fit: cover; transition: opacity .2s ease; }
.magnifier-card.is-zoom img { opacity: .2; }
.site-footer { padding: 58px clamp(20px, 5vw, 72px) 28px; background: #091522; color: rgba(255,255,255,.82); }
.footer-grid { display: grid; grid-template-columns: 1.3fr .8fr 1fr .9fr; gap: 28px; }
.site-footer h2 { font-size: 20px; color: var(--white); margin-bottom: 12px; }
.site-footer a { display: block; color: rgba(255,255,255,.78); margin: 7px 0; }
.site-footer a:hover { color: var(--yellow); }
.footer-note { margin-top: 36px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.12); font-size: 14px; color: rgba(255,255,255,.58); }
@media (max-width: 980px) {
  .nav-toggle { display: inline-flex; }
  .main-nav { position: absolute; left: 18px; right: 18px; top: 72px; display: none; flex-direction: column; align-items: stretch; padding: 14px; background: rgba(244,247,250,.98); border: 1px solid var(--line); box-shadow: var(--shadow); }
  .main-nav.open { display: flex; }
  .hero-section, .split, .tab-shell { grid-template-columns: 1fr; }
  .hero-gallery { min-height: 300px; }
  .cards.three, .stamp-grid, .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  body { font-size: 15px; }
  .site-header { padding-inline: 14px; }
  .brand { min-width: 0; }
  .brand-copy small { display: none; }
  .hero-section { min-height: auto; padding-top: 96px; }
  .cards.three, .stamp-grid, .footer-grid { grid-template-columns: 1fr; }
  .article { padding: 20px; }
  .tab-panel { padding: 22px; }
}