/* ===== Reset & Base ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: #424242; background: #F5F7FA; line-height: 1.7;
}
a { text-decoration: none; color: inherit; transition: color .2s; }
ul, ol { list-style: none; }
img { max-width: 100%; display: block; }
h1,h2,h3,h4,h5,h6 { color: #1A1A2E; line-height: 1.3; font-weight: 700; }
h1 { font-size: 2.4rem; }
h2 { font-size: 1.8rem; margin-bottom: .8rem; }
h3 { font-size: 1.3rem; margin-bottom: .5rem; }
p { margin-bottom: .8rem; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 70px 0; }
.section-title { text-align: center; margin-bottom: 50px; }
.section-title h2 { position: relative; display: inline-block; }
.section-title h2::after {
  content: ''; display: block; width: 60px; height: 3px;
  background: #FF6D00; margin: 12px auto 0; border-radius: 2px;
}
.section-title p { color: #757575; margin-top: 8px; font-size: 1.05rem; }

/* ===== Header / Nav ===== */
.site-header {
  position: sticky; top: 0; z-index: 1000;
  background: #fff; border-bottom: 1px solid #E8E8E8;
  box-shadow: 0 2px 8px rgba(0,0,0,.06);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 1200px; margin: 0 auto; padding: 0 20px; height: 68px;
}
.logo { font-size: 1.35rem; font-weight: 800; color: #1565C0; white-space: nowrap; }
.logo span { color: #FF6D00; }
.nav-links { display: flex; gap: 0; }
.nav-links > li { position: relative; }
.nav-links > li > a {
  display: block; padding: 0 18px; line-height: 68px; font-size: .95rem;
  font-weight: 600; color: #1A1A2E; transition: color .2s, background .2s;
}
.nav-links > li > a:hover,
.nav-links > li.active > a { color: #1565C0; }
/* dropdown */
.dropdown-menu {
  position: absolute; top: 100%; left: 0; min-width: 180px;
  background: #fff; border: 1px solid #E8E8E8; border-radius: 6px;
  box-shadow: 0 8px 24px rgba(0,0,0,.1); opacity: 0; visibility: hidden;
  transform: translateY(8px); transition: all .25s;
}
.nav-links > li:hover .dropdown-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown-menu li a {
  display: block; padding: 10px 18px; font-size: .9rem; color: #424242;
  border-bottom: 1px solid #f0f0f0; transition: background .15s;
}
.dropdown-menu li:last-child a { border-bottom: none; }
.dropdown-menu li a:hover { background: #EBF2FC; color: #1565C0; }

/* mobile toggle */
.nav-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 6px; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: #1A1A2E; border-radius: 2px; transition: .3s; }

/* ===== Buttons ===== */
.btn {
  display: inline-block; padding: 13px 32px; border-radius: 6px;
  font-size: 1rem; font-weight: 600; cursor: pointer; border: none;
  transition: transform .2s, box-shadow .2s, background .2s; text-align: center;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,0,0,.15); }
.btn-primary { background: #FF6D00; color: #fff; }
.btn-primary:hover { background: #E65100; color: #fff; }
.btn-secondary { background: #fff; color: #1565C0; border: 2px solid #1565C0; }
.btn-secondary:hover { background: #1565C0; color: #fff; }
.btn-outline { background: transparent; color: #fff; border: 2px solid #fff; }
.btn-outline:hover { background: #fff; color: #1565C0; }
.btn-sm { padding: 9px 22px; font-size: .9rem; }

/* ===== Hero ===== */
.hero {
  background: linear-gradient(135deg, #0D47A1 0%, #1565C0 40%, #1E88E5 100%);
  color: #fff; padding: 100px 0 90px; text-align: center; position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.hero h1 { color: #fff; font-size: 2.8rem; margin-bottom: 16px; position: relative; }
.hero .subtitle { font-size: 1.15rem; max-width: 680px; margin: 0 auto 36px; opacity: .92; line-height: 1.8; position: relative; }
.hero-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; position: relative; }

/* ===== Product Cards ===== */
.products-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px;
}
.product-card {
  background: #fff; border-radius: 10px; overflow: hidden;
  border: 1px solid #E8E8E8; transition: transform .25s, box-shadow .25s;
}
.product-card:hover { transform: translateY(-6px); box-shadow: 0 12px 32px rgba(0,0,0,.1); }
.product-card-img {
  height: 180px; display: flex; align-items: center; justify-content: center;
  font-size: 3.5rem; color: #1565C0;
}
.product-card-img.bg-1 { background: linear-gradient(135deg, #E3F2FD, #BBDEFB); }
.product-card-img.bg-2 { background: linear-gradient(135deg, #FFF3E0, #FFE0B2); }
.product-card-img.bg-3 { background: linear-gradient(135deg, #E8F5E9, #C8E6C9); }
.product-card-img.bg-4 { background: linear-gradient(135deg, #F3E5F5, #E1BEE7); }
.product-card-img.bg-5 { background: linear-gradient(135deg, #FFEBEE, #FFCDD2); }
.product-card-img.bg-6 { background: linear-gradient(135deg, #E0F7FA, #B2EBF2); }
.product-card-body { padding: 22px; }
.product-card-body h3 { font-size: 1.15rem; margin-bottom: 8px; }
.product-card-body p { font-size: .92rem; color: #757575; margin-bottom: 14px; min-height: 42px; }
.product-card-body .link { color: #1565C0; font-weight: 600; font-size: .9rem; }
.product-card-body .link:hover { color: #FF6D00; }

/* ===== Advantages ===== */
.advantages-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; }
.advantage-item { text-align: center; padding: 36px 20px; background: #fff; border-radius: 10px; border: 1px solid #E8E8E8; transition: box-shadow .25s; }
.advantage-item:hover { box-shadow: 0 8px 24px rgba(0,0,0,.08); }
.advantage-icon {
  width: 72px; height: 72px; border-radius: 50%; margin: 0 auto 18px;
  display: flex; align-items: center; justify-content: center; font-size: 1.8rem;
  background: #EBF2FC; color: #1565C0;
}
.advantage-item h3 { font-size: 1.1rem; margin-bottom: 8px; }
.advantage-item p { font-size: .9rem; color: #757575; margin-bottom: 0; }

/* ===== Applications Icons ===== */
.app-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 20px; }
.app-item {
  text-align: center; padding: 28px 10px; background: #fff; border-radius: 10px;
  border: 1px solid #E8E8E8; transition: transform .2s, box-shadow .2s;
}
.app-item:hover { transform: translateY(-4px); box-shadow: 0 8px 20px rgba(0,0,0,.08); }
.app-icon {
  width: 56px; height: 56px; border-radius: 12px; margin: 0 auto 12px;
  display: flex; align-items: center; justify-content: center; font-size: 1.5rem;
  background: linear-gradient(135deg, #1565C0, #1E88E5); color: #fff;
}
.app-item p { font-size: .88rem; font-weight: 600; color: #1A1A2E; margin-bottom: 0; }

/* ===== Process / Steps ===== */
.process-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.process-step { text-align: center; position: relative; }
.step-num {
  width: 56px; height: 56px; border-radius: 50%; margin: 0 auto 16px;
  display: flex; align-items: center; justify-content: center;
  background: #1565C0; color: #fff; font-size: 1.3rem; font-weight: 800;
}
.process-step h3 { font-size: 1.05rem; margin-bottom: 6px; }
.process-step p { font-size: .88rem; color: #757575; margin-bottom: 0; }

/* ===== CTA Banner ===== */
.cta-banner {
  background: linear-gradient(135deg, #0D47A1, #1565C0);
  color: #fff; text-align: center; padding: 60px 20px;
}
.cta-banner h2 { color: #fff; margin-bottom: 12px; }
.cta-banner p { opacity: .9; margin-bottom: 28px; font-size: 1.05rem; }
.cta-banner .btn { margin: 0 8px; }

/* ===== About Page ===== */
.about-hero {
  background: linear-gradient(135deg, #0D47A1, #1565C0); color: #fff;
  padding: 60px 0; text-align: center;
}
.about-hero h1 { color: #fff; font-size: 2.2rem; }
.about-content { max-width: 900px; margin: 0 auto; }
.about-content p { font-size: 1.02rem; line-height: 1.9; margin-bottom: 1.2rem; }
.about-section { margin-bottom: 40px; }
.about-section h2 { position: relative; padding-left: 16px; margin-bottom: 18px; font-size: 1.5rem; }
.about-section h2::before {
  content: ''; position: absolute; left: 0; top: 4px; bottom: 4px;
  width: 4px; background: #FF6D00; border-radius: 2px;
}
.scope-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.scope-list li {
  padding: 12px 18px; background: #fff; border-radius: 8px;
  border: 1px solid #E8E8E8; font-weight: 500; display: flex; align-items: center; gap: 10px;
}
.scope-list li::before { content: '✓'; color: #1565C0; font-weight: 800; font-size: 1.1rem; }
.values-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.value-card { background: #fff; border-radius: 10px; padding: 30px; border: 1px solid #E8E8E8; text-align: center; }
.value-card .icon { font-size: 2.2rem; margin-bottom: 12px; }
.value-card h3 { margin-bottom: 8px; }
.value-card p { font-size: .9rem; color: #757575; margin-bottom: 0; }

/* ===== Product Detail ===== */
.product-hero {
  background: linear-gradient(135deg, #0D47A1, #1565C0); color: #fff;
  padding: 50px 0; text-align: center;
}
.product-hero h1 { color: #fff; font-size: 2rem; }
.product-hero .breadcrumb { margin-top: 10px; opacity: .8; font-size: .9rem; }
.product-hero .breadcrumb a { color: #fff; }
.product-hero .breadcrumb a:hover { text-decoration: underline; }
.product-intro { background: #fff; border-radius: 10px; padding: 36px; margin-bottom: 36px; border: 1px solid #E8E8E8; }
.product-intro p { font-size: 1.02rem; line-height: 1.9; }
.features-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-bottom: 36px; }
.feature-item {
  background: #fff; border-radius: 10px; padding: 24px; text-align: center;
  border: 1px solid #E8E8E8; transition: box-shadow .2s;
}
.feature-item:hover { box-shadow: 0 6px 18px rgba(0,0,0,.08); }
.feature-item .icon { font-size: 1.8rem; margin-bottom: 10px; }
.feature-item h4 { font-size: .98rem; margin-bottom: 4px; }
.feature-item p { font-size: .82rem; color: #757575; margin-bottom: 0; }

/* Spec Table */
.spec-table { width: 100%; border-collapse: collapse; margin-bottom: 36px; background: #fff; border-radius: 10px; overflow: hidden; border: 1px solid #E8E8E8; }
.spec-table th, .spec-table td { padding: 14px 20px; text-align: left; border-bottom: 1px solid #f0f0f0; }
.spec-table th { background: #1565C0; color: #fff; font-weight: 600; font-size: .95rem; }
.spec-table tr:last-child td { border-bottom: none; }
.spec-table tr:hover td { background: #EBF2FC; }
.spec-table td:first-child { font-weight: 600; color: #1A1A2E; }

/* Application tags */
.app-tags { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 36px; }
.app-tag {
  padding: 10px 22px; background: #EBF2FC; color: #1565C0;
  border-radius: 30px; font-weight: 600; font-size: .92rem;
  border: 1px solid #BBDEFB;
}

/* Inquiry CTA */
.inquiry-cta {
  background: linear-gradient(135deg, #FF6D00, #FF8F00); border-radius: 12px;
  padding: 40px; text-align: center; color: #fff; margin-bottom: 36px;
}
.inquiry-cta h2 { color: #fff; margin-bottom: 10px; font-size: 1.5rem; }
.inquiry-cta p { opacity: .95; margin-bottom: 22px; }
.inquiry-cta .btn { background: #fff; color: #FF6D00; font-weight: 700; }
.inquiry-cta .btn:hover { background: #FFF3E0; }

/* ===== Applications Page ===== */
.app-detail { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; margin-bottom: 50px; align-items: center; }
.app-detail:nth-child(even) { direction: rtl; }
.app-detail:nth-child(even) > * { direction: ltr; }
.app-detail-img {
  height: 260px; border-radius: 12px; display: flex; align-items: center; justify-content: center;
  font-size: 3.5rem; color: #1565C0;
}
.app-detail-img.bg-a { background: linear-gradient(135deg, #E3F2FD, #BBDEFB); }
.app-detail-img.bg-b { background: linear-gradient(135deg, #FFF3E0, #FFE0B2); }
.app-detail-img.bg-c { background: linear-gradient(135deg, #E8F5E9, #C8E6C9); }
.app-detail-img.bg-d { background: linear-gradient(135deg, #FFEBEE, #FFCDD2); }
.app-detail-img.bg-e { background: linear-gradient(135deg, #F3E5F5, #E1BEE7); }
.app-detail-img.bg-f { background: linear-gradient(135deg, #E0F7FA, #B2EBF2); }
.app-detail-content h2 { font-size: 1.5rem; margin-bottom: 12px; }
.app-detail-content p { font-size: .98rem; line-height: 1.8; margin-bottom: 10px; }
.app-detail-content .rec-products { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.app-detail-content .rec-products span {
  padding: 6px 16px; background: #EBF2FC; color: #1565C0;
  border-radius: 20px; font-size: .85rem; font-weight: 600;
}

/* ===== FAQ ===== */
.faq-list { max-width: 860px; margin: 0 auto; }
.faq-item {
  background: #fff; border-radius: 10px; margin-bottom: 14px;
  border: 1px solid #E8E8E8; overflow: hidden; transition: box-shadow .2s;
}
.faq-item:hover { box-shadow: 0 4px 14px rgba(0,0,0,.06); }
.faq-question {
  padding: 20px 24px; cursor: pointer; display: flex; align-items: center;
  justify-content: space-between; font-weight: 600; font-size: 1rem;
  color: #1A1A2E; transition: background .2s; user-select: none;
}
.faq-question:hover { background: #FAFBFC; }
.faq-question .arrow { font-size: 1.2rem; color: #1565C0; transition: transform .3s; flex-shrink: 0; margin-left: 16px; }
.faq-item.active .faq-question .arrow { transform: rotate(180deg); }
.faq-answer {
  max-height: 0; overflow: hidden; transition: max-height .35s ease, padding .35s;
  padding: 0 24px; color: #616161; line-height: 1.8; font-size: .95rem;
}
.faq-item.active .faq-answer { max-height: 400px; padding: 0 24px 20px; }

/* ===== Contact ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.contact-info-list li {
  display: flex; align-items: flex-start; gap: 14px; padding: 16px 0;
  border-bottom: 1px solid #f0f0f0;
}
.contact-info-list li:last-child { border-bottom: none; }
.contact-info-list .icon {
  width: 44px; height: 44px; border-radius: 10px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  background: #EBF2FC; color: #1565C0; font-size: 1.2rem;
}
.contact-info-list .text strong { display: block; margin-bottom: 2px; color: #1A1A2E; }
.contact-info-list .text span { font-size: .92rem; color: #616161; }

/* Form */
.contact-form { background: #fff; border-radius: 12px; padding: 36px; border: 1px solid #E8E8E8; }
.contact-form h3 { margin-bottom: 24px; font-size: 1.3rem; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; margin-bottom: 6px; font-weight: 600; font-size: .92rem; color: #1A1A2E; }
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%; padding: 12px 16px; border: 1px solid #E8E8E8;
  border-radius: 8px; font-size: .95rem; font-family: inherit;
  transition: border-color .2s; background: #FAFBFC;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus { outline: none; border-color: #1565C0; background: #fff; }
.form-group textarea { resize: vertical; min-height: 110px; }

/* ===== Footer ===== */
.site-footer {
  background: #1A1A2E; color: rgba(255,255,255,.7); padding: 50px 0 0;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-col h4 { color: #fff; margin-bottom: 18px; font-size: 1.05rem; }
.footer-col p { font-size: .88rem; line-height: 1.7; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a { font-size: .88rem; color: rgba(255,255,255,.7); transition: color .2s; }
.footer-col ul li a:hover { color: #FF6D00; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.1); padding: 20px 0;
  text-align: center; font-size: .82rem;
}
.footer-bottom a { color: rgba(255,255,255,.5); }

/* ===== Page Hero (generic) ===== */
.page-hero {
  background: linear-gradient(135deg, #0D47A1, #1565C0); color: #fff;
  padding: 56px 0; text-align: center;
}
.page-hero h1 { color: #fff; font-size: 2.2rem; margin-bottom: 8px; }
.page-hero p { opacity: .85; font-size: 1.05rem; }

/* ===== Responsive ===== */
@media (max-width: 992px) {
  .products-grid { grid-template-columns: repeat(2, 1fr); }
  .advantages-grid { grid-template-columns: repeat(2, 1fr); }
  .app-grid { grid-template-columns: repeat(3, 1fr); }
  .process-grid { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .app-detail { grid-template-columns: 1fr; }
  .app-detail:nth-child(even) { direction: ltr; }
  .contact-grid { grid-template-columns: 1fr; }
  .values-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  h1 { font-size: 1.8rem; }
  h2 { font-size: 1.4rem; }
  .hero { padding: 60px 0 50px; }
  .hero h1 { font-size: 2rem; }
  .hero .subtitle { font-size: 1rem; }
  .section { padding: 45px 0; }

  /* Mobile nav */
  .nav-toggle { display: flex; }
  .nav-links {
    display: none; position: absolute; top: 68px; left: 0; right: 0;
    background: #fff; flex-direction: column; border-bottom: 1px solid #E8E8E8;
    box-shadow: 0 8px 24px rgba(0,0,0,.1);
  }
  .nav-links.open { display: flex; }
  .nav-links > li > a { line-height: 48px; padding: 0 20px; border-bottom: 1px solid #f5f5f5; }
  .dropdown-menu {
    position: static; opacity: 1; visibility: visible; transform: none;
    box-shadow: none; border: none; border-radius: 0; background: #FAFBFC;
    display: none;
  }
  .nav-links > li:hover .dropdown-menu,
  .nav-links > li.open .dropdown-menu { display: block; }
  .dropdown-menu li a { padding: 10px 36px; }

  .products-grid { grid-template-columns: 1fr; }
  .advantages-grid { grid-template-columns: 1fr 1fr; }
  .app-grid { grid-template-columns: repeat(3, 1fr); }
  .process-grid { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .scope-list { grid-template-columns: 1fr; }
  .values-grid { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .advantages-grid { grid-template-columns: 1fr; }
  .app-grid { grid-template-columns: repeat(2, 1fr); }
  .process-grid { grid-template-columns: 1fr 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .hero-buttons { flex-direction: column; align-items: center; }
  .hero-buttons .btn { width: 80%; }
}