:root {
  --navy-900: #0a1628;
  --navy-800: #0d1b2e;
  --navy-700: #122540;
  --steel: #5b6b80;
  --text: #22303f;
  --text-light: #5b6b80;
  --line: #e3e8ef;
  --bg: #ffffff;
  --bg-alt: #f4f7fa;
  --accent: #0e7fd6;
  --accent-dark: #0a63a8;
  --radius: 12px;
  --shadow: 0 6px 24px rgba(13, 27, 46, 0.08);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.container { max-width: 1160px; margin: 0 auto; padding: 0 24px; }

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(10, 22, 40, 0.85);
  backdrop-filter: blur(10px);
  transition: box-shadow .25s ease;
}
.site-header.scrolled { box-shadow: 0 2px 16px rgba(0,0,0,.25); }

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand { display: flex; align-items: center; text-decoration: none; }
.brand-logo { height: 40px; display: block; }

.main-nav { display: flex; gap: 6px; }
.main-nav a {
  color: rgba(255,255,255,.78);
  text-decoration: none;
  font-size: 15px;
  padding: 8px 16px;
  border-radius: 8px;
  transition: color .2s, background .2s;
}
.main-nav a:hover { color: #fff; background: rgba(255,255,255,.08); }
.main-nav a.active { color: #fff; background: rgba(14,127,214,.35); }

.nav-toggle {
  display: none;
  flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 8px;
}
.nav-toggle span { width: 22px; height: 2px; background: #fff; border-radius: 2px; transition: transform .25s, opacity .25s; }
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  color: #fff;
  overflow: hidden;
  background: var(--navy-900);
}
.hero-bg {
  position: absolute; inset: 0;
  background: url("assets/hero-industrial.png") center/cover no-repeat;
  opacity: .55;
}
.hero::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(105deg, rgba(10,22,40,.92) 20%, rgba(10,22,40,.45) 60%, rgba(10,22,40,.2));
}
.hero-content { position: relative; z-index: 2; padding-top: 68px; }
.hero-eyebrow {
  display: inline-block;
  font-size: 14px;
  letter-spacing: 4px;
  color: #7cc4ff;
  border: 1px solid rgba(124,196,255,.4);
  border-radius: 999px;
  padding: 6px 18px;
  margin-bottom: 26px;
}
.hero h1 {
  font-size: clamp(32px, 5vw, 54px);
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: 1px;
  margin-bottom: 22px;
}
.hero-sub {
  font-size: clamp(15px, 1.6vw, 18px);
  color: rgba(255,255,255,.82);
  margin-bottom: 38px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 13px 34px;
  border-radius: 10px;
  font-size: 16px;
  text-decoration: none;
  transition: transform .18s, box-shadow .18s, background .18s;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 6px 18px rgba(14,127,214,.4); }
.btn-primary:hover { background: var(--accent-dark); }
.btn-ghost { border: 1px solid rgba(255,255,255,.5); color: #fff; }
.btn-ghost:hover { background: rgba(255,255,255,.12); }
.btn-light { background: #fff; color: var(--navy-800); font-weight: 600; }
.btn-light:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(0,0,0,.2); }

/* ---------- Sections ---------- */
.section { padding: 96px 0; }
.section-alt { background: var(--bg-alt); }

.section-head { text-align: center; margin-bottom: 56px; }
.section-head h2 {
  font-size: clamp(26px, 3vw, 34px);
  color: var(--navy-800);
  letter-spacing: 1px;
  margin-bottom: 10px;
}
.section-head h2::after {
  content: "";
  display: block;
  width: 44px; height: 3px;
  margin: 16px auto 0;
  border-radius: 2px;
  background: var(--accent);
}
.section-head p { color: var(--text-light); font-size: 16px; }
.section-note { text-align: center; color: var(--text-light); font-size: 14px; margin-top: 28px; }

/* ---------- Product cards ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 28px;
}
.product-card {
  position: relative;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 36px 30px;
  box-shadow: var(--shadow);
  transition: transform .22s, box-shadow .22s;
}
.product-card:hover { transform: translateY(-6px); box-shadow: 0 14px 34px rgba(13,27,46,.14); }
.card-icon {
  width: 60px; height: 60px;
  color: var(--accent);
  margin-bottom: 22px;
}
.card-icon svg { width: 100%; height: 100%; }
.product-card h3 { font-size: 20px; color: var(--navy-800); margin-bottom: 12px; }
.product-card p { font-size: 15px; color: var(--text-light); }
.card-tag {
  position: absolute; top: 20px; right: 20px;
  font-size: 12px;
  color: var(--accent);
  background: rgba(14,127,214,.1);
  border-radius: 999px;
  padding: 3px 12px;
}

/* ---------- Features ---------- */
.feature-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.feature-item {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 24px;
}
.feature-item strong { display: block; font-size: 17px; color: var(--navy-800); margin-bottom: 10px; }
.feature-item p { font-size: 14px; color: var(--text-light); }

/* ---------- Scenes ---------- */
.scene-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.scene-item {
  border-left: 3px solid var(--accent);
  background: var(--bg-alt);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 26px 28px;
}
.scene-item h4 { font-size: 17px; color: var(--navy-800); margin-bottom: 8px; }
.scene-item p { font-size: 14px; color: var(--text-light); }

/* ---------- CTA band ---------- */
.cta-band {
  background: linear-gradient(120deg, var(--navy-800), var(--navy-700));
  color: #fff;
  padding: 72px 0;
}
.cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}
.cta-inner h2 { font-size: 26px; margin-bottom: 8px; }
.cta-inner p { color: rgba(255,255,255,.75); }

/* ---------- Footer ---------- */
.site-footer { background: var(--navy-900); color: rgba(255,255,255,.65); }
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
  flex-wrap: wrap;
  padding: 48px 24px 28px;
}
.footer-brand strong { color: #fff; font-size: 17px; letter-spacing: 1px; }
.footer-brand p { font-size: 13px; margin-top: 8px; }
.footer-links { display: flex; gap: 22px; flex-wrap: wrap; }
.footer-links a { color: rgba(255,255,255,.65); text-decoration: none; font-size: 14px; }
.footer-links a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.1);
  padding-top: 20px; padding-bottom: 24px;
  font-size: 13px;
}

/* ---------- Placeholder page ---------- */
.page-hero {
  padding: 160px 0 72px;
  background: linear-gradient(120deg, var(--navy-800), var(--navy-700));
  color: #fff;
  text-align: center;
}
.page-hero h1 { font-size: clamp(28px, 4vw, 40px); letter-spacing: 2px; margin-bottom: 12px; }
.page-hero p { color: rgba(255,255,255,.72); }
.placeholder-box {
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
  background: #fff;
  border: 1px dashed #c4cfdb;
  border-radius: var(--radius);
  padding: 56px 32px;
  color: var(--text-light);
}
.placeholder-box h3 { color: var(--navy-800); margin-bottom: 10px; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .card-grid { grid-template-columns: 1fr; }
  .feature-row { grid-template-columns: repeat(2, 1fr); }
  .scene-grid { grid-template-columns: 1fr; }
  .br-wide { display: none; }
}
@media (max-width: 680px) {
  .section { padding: 64px 0; }
  .nav-toggle { display: flex; }
  .main-nav {
    position: absolute;
    top: 68px; left: 0; right: 0;
    flex-direction: column;
    background: rgba(10,22,40,.97);
    padding: 12px 16px 20px;
    gap: 2px;
    display: none;
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 12px 14px; }
  .feature-row { grid-template-columns: 1fr; }
  .cta-inner { flex-direction: column; align-items: flex-start; }
  .hero { min-height: 82vh; }
}


/* ---------- Contact ---------- */
.footer-contact { margin-top: 10px; font-size: 13px; }
.footer-contact a { color: rgba(255,255,255,.85); text-decoration: none; }
.footer-contact a:hover { color: #fff; text-decoration: underline; }

.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 880px;
  margin: 0 auto;
}
.contact-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  box-shadow: var(--shadow);
}
.contact-card h4 { font-size: 15px; color: var(--text-light); font-weight: 500; margin-bottom: 12px; }
.contact-card p { font-size: 20px; color: var(--navy-800); font-weight: 600; }
.contact-card p a { color: var(--accent); text-decoration: none; }
.contact-card p a:hover { text-decoration: underline; }
.contact-card small { display: block; margin-top: 8px; color: var(--text-light); font-size: 13px; }
@media (max-width: 900px) { .contact-grid { grid-template-columns: 1fr; } }

/* ---------- 行业标签 / 产品分类 ---------- */
.industry-grid { display: flex; flex-wrap: wrap; gap: 12px; }
.chip {
  display: inline-block;
  padding: 10px 20px;
  background: var(--bg-alt);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 15px;
  color: var(--navy-800);
  font-weight: 500;
  transition: border-color .2s ease, color .2s ease;
}
.chip:hover { border-color: var(--accent); color: var(--accent); }

.cat-block { margin-bottom: 28px; }
.cat-block h3 {
  font-size: 19px;
  color: var(--navy-800);
  margin-bottom: 14px;
  padding-left: 12px;
  border-left: 4px solid var(--accent);
}
.cat-items { display: flex; flex-wrap: wrap; gap: 10px; }

/* ---------- 应用案例 ---------- */
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.case-card {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 26px;
  box-shadow: var(--shadow);
}
.case-tag {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 999px;
  background: rgba(14, 127, 214, 0.1);
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 14px;
}
.case-card h3 { font-size: 19px; color: var(--navy-800); margin-bottom: 8px; }
.case-card .case-product { font-size: 14px; color: var(--accent-dark); font-weight: 600; margin-bottom: 10px; }
.case-card p { font-size: 15px; color: var(--text-light); }
@media (max-width: 900px) { .case-grid { grid-template-columns: 1fr; } }

/* ---------- 详情文本 / 规格表 ---------- */
.lead { font-size: 17px; line-height: 1.9; color: var(--text); }
.sub-head {
  font-size: 20px;
  color: var(--navy-800);
  margin: 40px 0 18px;
  padding-left: 12px;
  border-left: 4px solid var(--accent);
}
.feature-list { list-style: none; margin: 0; padding: 0; }
.feature-list li {
  position: relative;
  padding: 10px 0 10px 28px;
  border-bottom: 1px solid var(--line);
  font-size: 16px;
}
.feature-list li::before {
  content: "";
  position: absolute;
  left: 6px; top: 20px;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
}
.spec-table { width: 100%; border-collapse: collapse; font-size: 15px; background: var(--bg); }
.spec-table th, .spec-table td {
  border: 1px solid var(--line);
  padding: 12px 16px;
  text-align: left;
}
.spec-table th { background: var(--bg-alt); color: var(--navy-800); font-weight: 600; }
.spec-table.two-col th:first-child { width: 40%; }
.spec-table td { color: var(--text); }
.compliance {
  margin-top: 40px;
  padding: 18px 22px;
  background: var(--bg-alt);
  border-left: 4px solid var(--steel);
  font-size: 13px;
  color: var(--text-light);
  line-height: 1.8;
}

/* ---------- 愿景 ---------- */
.vision-band { text-align: center; padding: 20px 0; }
.vision-band h2 { font-size: 22px; color: var(--text-light); font-weight: 500; margin-bottom: 16px; }
.vision-main { font-size: 28px; font-weight: 700; color: var(--navy-800); margin-bottom: 12px; }
.vision-sub { font-size: 17px; color: var(--accent); font-weight: 600; }
@media (max-width: 900px) { .vision-main { font-size: 22px; } }

/* ---------- 产品图片 ---------- */
.product-figure { margin: 8px 0 32px; }
.product-figure img {
  display: block;
  max-width: 560px;
  width: 100%;
  margin: 0 auto;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

/* ---------- 案例双列布局 ---------- */
.case-grid-2col { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 900px) { .case-grid-2col { grid-template-columns: 1fr; } }