/* ===== GXDAQ Shared Stylesheet ===== */

/* Reset & Base */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: 'Segoe UI', Arial, Helvetica, sans-serif;
  color: #333;
  background: #f5f7fa;
  line-height: 1.6;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ===== Navigation Bar ===== */
.navbar {
  background: linear-gradient(135deg, #0a1f44 0%, #0d2b5e 100%);
  padding: 0 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  box-shadow: 0 2px 12px rgba(0,0,0,.25);
  position: sticky;
  top: 0;
  z-index: 1000;
}
.navbar .logo {
  font-size: 22px;
  font-weight: 700;
  color: #fff;
  letter-spacing: 1.5px;
}
.navbar .logo span { color: #4ea8ff; }
.nav-links { list-style: none; display: flex; gap: 32px; }
.nav-links li a {
  color: rgba(255,255,255,.85);
  font-size: 15px;
  font-weight: 500;
  transition: color .2s;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
}
.nav-links li a:hover,
.nav-links li a.active {
  color: #fff;
  border-bottom-color: #4ea8ff;
}
.nav-cta {
  display: flex;
  align-items: center;
  gap: 16px;
}
.nav-cta a {
  color: rgba(255,255,255,.85);
  font-size: 14px;
  font-weight: 500;
  transition: color .2s;
}
.nav-cta a:hover { color: #fff; }
.nav-cta .btn-contact {
  background: rgba(255,255,255,.12);
  padding: 7px 18px;
  border-radius: 5px;
  border: 1px solid rgba(255,255,255,.25);
  transition: background .2s;
}
.nav-cta .btn-contact:hover { background: rgba(255,255,255,.22); }

/* ===== Breadcrumb ===== */
.breadcrumb-bar {
  background: #e8edf3;
  padding: 12px 40px;
  font-size: 13px;
  color: #667;
}
.breadcrumb-bar a { color: #0d2b5e; font-weight: 500; }
.breadcrumb-bar a:hover { text-decoration: underline; }
.breadcrumb-bar span.sep { margin: 0 8px; color: #99a; }

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  padding: 13px 32px;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 600;
  transition: transform .2s, box-shadow .2s;
  cursor: pointer;
  border: none;
}
.btn-primary {
  background: linear-gradient(135deg, #4ea8ff 0%, #2b8cef 100%);
  color: #fff;
  box-shadow: 0 4px 16px rgba(78,168,255,.35);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(78,168,255,.5);
}
.btn-outline {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255,255,255,.4);
}
.btn-outline:hover {
  background: rgba(255,255,255,.1);
  border-color: rgba(255,255,255,.7);
}
.btn-outline-dark {
  display: inline-block;
  padding: 12px 36px;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 600;
  color: #0a1f44;
  border: 2px solid #0a1f44;
  background: transparent;
  transition: all .2s;
}
.btn-outline-dark:hover {
  background: #0a1f44;
  color: #fff;
}
.btn-inquiry {
  display: inline-block;
  background: linear-gradient(135deg, #e8530e 0%, #ff7a33 100%);
  color: #fff;
  padding: 14px 44px;
  border-radius: 6px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .5px;
  transition: transform .2s, box-shadow .2s;
  box-shadow: 0 4px 14px rgba(232,83,14,.35);
}
.btn-inquiry:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 22px rgba(232,83,14,.45);
}

/* ===== Section Common ===== */
.section { padding: 72px 0; }
.section-header { text-align: center; margin-bottom: 48px; }
.section-header h2 {
  font-size: 30px;
  color: #0a1f44;
  font-weight: 700;
  margin-bottom: 10px;
}
.section-header p { font-size: 15px; color: #777; }
.section-title {
  font-size: 24px;
  color: #0a1f44;
  font-weight: 700;
  margin-bottom: 24px;
  padding-bottom: 10px;
  border-bottom: 3px solid #4ea8ff;
  display: inline-block;
}

/* ===== Hero Section ===== */
.hero {
  background: linear-gradient(135deg, #0a1f44 0%, #0d2b5e 50%, #163d7a 100%);
  padding: 80px 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 60px;
  min-height: 520px;
  overflow: hidden;
  position: relative;
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(78,168,255,.12) 0%, transparent 70%);
  border-radius: 50%;
}
.hero-text { flex: 1; max-width: 540px; position: relative; z-index: 1; }
.hero-text h1 {
  font-size: 42px;
  color: #fff;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 20px;
}
.hero-text h1 .accent { color: #4ea8ff; }
.hero-text p {
  font-size: 16px;
  color: rgba(255,255,255,.75);
  line-height: 1.8;
  margin-bottom: 36px;
}
.hero-buttons { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-image { flex: 0 0 420px; position: relative; z-index: 1; }
.hero-image img {
  width: 100%;
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0,0,0,.3);
}

/* ===== Product Categories ===== */
.cat-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
}
.cat-card {
  background: #fff;
  border-radius: 12px;
  padding: 32px 16px;
  text-align: center;
  box-shadow: 0 2px 12px rgba(0,0,0,.06);
  transition: transform .25s, box-shadow .25s;
  border-bottom: 3px solid transparent;
}
.cat-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 8px 28px rgba(0,0,0,.1);
  border-bottom-color: #4ea8ff;
}
.cat-card .cat-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  background: linear-gradient(135deg, #0d2b5e, #1a4a8a);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.cat-card .cat-icon svg { width: 26px; height: 26px; fill: #fff; }
.cat-card h3 { font-size: 15px; color: #0a1f44; font-weight: 600; }

/* ===== Featured Products ===== */
.section-products { background: #fff; }
.prod-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.prod-card {
  background: #f8fafc;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(0,0,0,.06);
  transition: transform .25s, box-shadow .25s;
}
.prod-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 8px 28px rgba(0,0,0,.12);
}
.prod-card .prod-img {
  height: 200px;
  background: #eef2f7;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.prod-card .prod-img img { width: 100%; height: 100%; object-fit: cover; }
.prod-card .prod-body { padding: 20px; }
.prod-card .prod-tag {
  display: inline-block;
  background: rgba(78,168,255,.12);
  color: #2b8cef;
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 4px;
  margin-bottom: 10px;
  letter-spacing: .3px;
}
.prod-card h3 { font-size: 18px; color: #0a1f44; margin-bottom: 8px; font-weight: 700; }
.prod-card .prod-specs { font-size: 13px; color: #888; margin-bottom: 14px; }
.prod-card .prod-link { font-size: 13px; color: #4ea8ff; font-weight: 600; }
.prod-card .prod-link:hover { color: #0d2b5e; }
.view-all-wrap { text-align: center; margin-top: 40px; }

/* ===== Stats Bar ===== */
.stats-bar {
  background: linear-gradient(135deg, #0a1f44 0%, #0d2b5e 100%);
  padding: 48px 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}
.stat-item .stat-value {
  font-size: 38px;
  font-weight: 800;
  color: #4ea8ff;
  margin-bottom: 6px;
  letter-spacing: 1px;
}
.stat-item .stat-label { font-size: 14px; color: rgba(255,255,255,.7); font-weight: 500; }

/* ===== Application Cards ===== */
.app-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.app-card {
  background: #fff;
  border-radius: 12px;
  padding: 40px 28px;
  text-align: center;
  box-shadow: 0 2px 16px rgba(0,0,0,.06);
  transition: transform .25s, box-shadow .25s;
  border-top: 4px solid #4ea8ff;
}
.app-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 8px 30px rgba(0,0,0,.12);
}
.app-card .app-icon {
  width: 68px;
  height: 68px;
  margin: 0 auto 20px;
  background: linear-gradient(135deg, #0d2b5e, #1a4a8a);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.app-card .app-icon svg { width: 32px; height: 32px; }
.app-card h3 { font-size: 18px; color: #0a1f44; margin-bottom: 12px; font-weight: 600; }
.app-card p { font-size: 14px; color: #777; line-height: 1.7; }

/* ===== Product Detail Page ===== */
.product-hero {
  max-width: 1200px;
  margin: 40px auto;
  padding: 0 20px;
  display: flex;
  gap: 48px;
  align-items: flex-start;
}
.product-image-wrap {
  flex: 0 0 500px;
  background: #fff;
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 4px 20px rgba(0,0,0,.07);
}
.product-image-wrap img { width: 100%; border-radius: 8px; }
.product-info { flex: 1; }
.product-info h1 { font-size: 32px; color: #0a1f44; margin-bottom: 6px; font-weight: 700; }
.product-info .subtitle {
  font-size: 16px;
  color: #4ea8ff;
  font-weight: 600;
  margin-bottom: 20px;
  letter-spacing: .5px;
}
.product-info .description { font-size: 15px; color: #555; line-height: 1.8; margin-bottom: 28px; }
.highlight-badges { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 28px; }
.highlight-badges .badge {
  background: linear-gradient(135deg, #0d2b5e, #163d7a);
  color: #fff;
  padding: 10px 22px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .3px;
}

/* Specs Table */
.specs-card {
  background: #fff;
  border-radius: 12px;
  padding: 32px 36px;
  box-shadow: 0 4px 20px rgba(0,0,0,.07);
}
.specs-table { width: 100%; border-collapse: collapse; }
.specs-table thead th {
  background: #0d2b5e;
  color: #fff;
  text-align: left;
  padding: 14px 18px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .4px;
}
.specs-table thead th:first-child { border-radius: 6px 0 0 0; }
.specs-table thead th:last-child  { border-radius: 0 6px 0 0; }
.specs-table tbody td {
  padding: 13px 18px;
  font-size: 14px;
  border-bottom: 1px solid #eef1f5;
  color: #444;
}
.specs-table tbody tr:nth-child(even) { background: #f8fafc; }
.specs-table tbody tr:hover { background: #edf3fb; }
.specs-table .param-name { font-weight: 600; color: #0d2b5e; width: 38%; }

/* CTA Banner */
.cta-banner {
  background: linear-gradient(135deg, #0a1f44 0%, #0d2b5e 60%, #163d7a 100%);
  padding: 56px 20px;
  text-align: center;
  margin-top: 20px;
}
.cta-banner h2 { color: #fff; font-size: 28px; margin-bottom: 12px; font-weight: 700; }
.cta-banner p { color: rgba(255,255,255,.75); font-size: 15px; margin-bottom: 30px; max-width: 600px; margin-left: auto; margin-right: auto; }
.cta-banner .btn-inquiry { font-size: 17px; padding: 16px 52px; }

/* ===== Products Listing Page ===== */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 36px;
  justify-content: center;
}
.filter-btn {
  padding: 9px 22px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 500;
  border: 2px solid #dde3ec;
  background: #fff;
  color: #555;
  cursor: pointer;
  transition: all .2s;
}
.filter-btn:hover,
.filter-btn.active {
  background: #0d2b5e;
  color: #fff;
  border-color: #0d2b5e;
}

/* ===== Download Page ===== */
.download-list { max-width: 800px; margin: 0 auto; }
.download-item {
  background: #fff;
  border-radius: 12px;
  padding: 24px 28px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 2px 12px rgba(0,0,0,.06);
  transition: transform .2s;
}
.download-item:hover { transform: translateY(-2px); }
.download-item .dl-info h3 { font-size: 17px; color: #0a1f44; margin-bottom: 4px; }
.download-item .dl-info p { font-size: 13px; color: #888; }
.download-item .dl-size { font-size: 13px; color: #aaa; margin-right: 20px; }
.btn-download {
  display: inline-block;
  background: linear-gradient(135deg, #4ea8ff 0%, #2b8cef 100%);
  color: #fff;
  padding: 10px 28px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  transition: transform .2s, box-shadow .2s;
}
.btn-download:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(78,168,255,.4);
}

/* ===== About Page ===== */
.about-content {
  max-width: 800px;
  margin: 0 auto;
}
.about-content .about-text {
  font-size: 15px;
  color: #555;
  line-height: 1.9;
  margin-bottom: 20px;
}
.contact-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 36px;
}
.contact-card {
  background: #fff;
  border-radius: 12px;
  padding: 32px 24px;
  text-align: center;
  box-shadow: 0 2px 12px rgba(0,0,0,.06);
  border-top: 4px solid #4ea8ff;
}
.contact-card .cc-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  background: linear-gradient(135deg, #0d2b5e, #1a4a8a);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.contact-card .cc-icon svg { width: 24px; height: 24px; fill: #fff; }
.contact-card h3 { font-size: 16px; color: #0a1f44; margin-bottom: 8px; }
.contact-card p { font-size: 14px; color: #777; }

/* ===== Contact Page ===== */
.contact-form-wrap {
  max-width: 700px;
  margin: 0 auto;
  background: #fff;
  border-radius: 12px;
  padding: 40px 36px;
  box-shadow: 0 4px 20px rgba(0,0,0,.07);
}
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; color: #0a1f44; margin-bottom: 6px; }
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid #dde3ec;
  border-radius: 6px;
  font-size: 14px;
  font-family: inherit;
  transition: border-color .2s;
  outline: none;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus { border-color: #4ea8ff; }
.form-group textarea { resize: vertical; min-height: 120px; }

/* ===== Footer ===== */
.footer {
  background: #060e1f;
  padding: 56px 40px 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1.5fr;
  gap: 48px;
  max-width: 1200px;
  margin: 0 auto;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.footer h4 { color: #fff; font-size: 16px; font-weight: 600; margin-bottom: 20px; }
.footer-brand .brand-name { font-size: 20px; font-weight: 700; color: #fff; margin-bottom: 14px; }
.footer-brand .brand-name span { color: #4ea8ff; }
.footer-brand p { font-size: 13px; color: rgba(255,255,255,.5); line-height: 1.8; }
.footer-links ul { list-style: none; }
.footer-links li { margin-bottom: 10px; }
.footer-links a { color: rgba(255,255,255,.6); font-size: 14px; transition: color .2s; }
.footer-links a:hover { color: #4ea8ff; }
.footer-contact .contact-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 14px;
  font-size: 13px;
  color: rgba(255,255,255,.55);
}
.footer-contact .contact-item svg { width: 16px; height: 16px; fill: #4ea8ff; flex-shrink: 0; margin-top: 2px; }
.footer-bottom { text-align: center; padding: 20px 0; max-width: 1200px; margin: 0 auto; }
.footer-bottom p { font-size: 12px; color: rgba(255,255,255,.35); }

/* ===== Why Choose TOPECH (Trade Advantages) ===== */
.why-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.why-card {
  background: #fff;
  border-radius: 12px;
  padding: 28px 22px;
  box-shadow: 0 2px 16px rgba(0,0,0,.06);
  border-top: 4px solid #4ea8ff;
  transition: transform .25s, box-shadow .25s;
}
.why-card:hover { transform: translateY(-6px); box-shadow: 0 8px 30px rgba(0,0,0,.12); }
.why-card h3 { font-size: 16px; color: #0a1f44; font-weight: 700; margin-bottom: 10px; }
.why-card p { font-size: 14px; color: #777; line-height: 1.7; }

/* ===== FAQ ===== */
.faq-list { max-width: 860px; }
.faq-item {
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 2px 12px rgba(0,0,0,.06);
  margin-bottom: 16px;
  overflow: hidden;
}
.faq-item summary {
  cursor: pointer;
  padding: 18px 56px 18px 24px;
  font-size: 16px;
  font-weight: 600;
  color: #0a1f44;
  list-style: none;
  position: relative;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+';
  position: absolute;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 22px;
  color: #4ea8ff;
  font-weight: 700;
}
.faq-item details[open] summary::after { content: '\2212'; }
.faq-item .faq-answer { padding: 0 24px 20px; font-size: 14px; color: #666; line-height: 1.8; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .cat-grid { grid-template-columns: repeat(3, 1fr); }
  .prod-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .why-grid { grid-template-columns: repeat(2, 1fr); }
  .hero { flex-direction: column; padding: 48px 20px; gap: 36px; min-height: auto; }
  .hero-image { flex: none; width: 100%; max-width: 380px; }
  .hero-text h1 { font-size: 30px; }
  .product-hero { flex-direction: column; gap: 28px; }
  .product-image-wrap { flex: none; width: 100%; max-width: 480px; margin: 0 auto; }
  .cat-grid { grid-template-columns: repeat(2, 1fr); }
  .prod-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
  .app-grid { grid-template-columns: 1fr; }
  .contact-cards { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .nav-links { display: none; }
  .nav-cta { display: none; }
  .navbar { padding: 0 20px; }
  .breadcrumb-bar { padding: 12px 20px; }
}
@media (max-width: 480px) {
  .why-grid { grid-template-columns: 1fr; }
  .cat-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .prod-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .product-info h1 { font-size: 24px; }
  .highlight-badges .badge { font-size: 12px; padding: 8px 14px; }
  .specs-card { padding: 18px 14px; }
}