/* ===== Reset & Base ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  background: #ffffff;
  color: #1a202c;
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: #00b4d8; text-decoration: none; transition: color .3s; }
a:hover { color: #0090b0; }
img { max-width: 100%; height: auto; }

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: #f7fafc; }
::-webkit-scrollbar-thumb { background: #cbd5e0; border-radius: 3px; }

/* ===== Canvas Background ===== */
#bg-canvas {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  z-index: 0; pointer-events: none;
}

/* ===== Navigation ===== */
.navbar {
  position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid #e2e8f0;
  transition: background .3s, box-shadow .3s;
}
.navbar.scrolled {
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
}
.nav-inner {
  max-width: 1200px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 24px; height: 70px;
}
.nav-logo {
  display: flex; align-items: center; gap: 10px;
}
.nav-logo img {
  height: 38px; width: auto;
}
.nav-logo-text {
  font-size: 16px; font-weight: 700; color: #1a202c;
  letter-spacing: 1px; white-space: nowrap;
}
.nav-links { display: flex; gap: 6px; list-style: none; }
.nav-links li a {
  display: block; padding: 8px 18px; color: #4a5568;
  font-size: 15px; font-weight: 500; border-radius: 6px;
  transition: all .3s; position: relative;
}
.nav-links li a:hover, .nav-links li a.active {
  color: #00b4d8; background: rgba(0, 180, 216, 0.06);
}
.nav-links li a.active::after {
  content: ''; position: absolute; bottom: 2px; left: 50%; transform: translateX(-50%);
  width: 20px; height: 2px; background: #00b4d8; border-radius: 1px;
}

/* Dropdown */
.nav-dropdown { position: relative; }
.nav-dropdown .dropdown-menu {
  position: absolute; top: 100%; left: 50%; transform: translateX(-50%);
  background: rgba(255, 255, 255, 0.98); backdrop-filter: blur(14px);
  border: 1px solid #e2e8f0; border-radius: 10px;
  padding: 8px 0; min-width: 180px;
  opacity: 0; visibility: hidden; transition: all .3s;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
}
.nav-dropdown:hover .dropdown-menu {
  opacity: 1; visibility: visible; transform: translateX(-50%) translateY(-4px);
}
.dropdown-menu a {
  display: block; padding: 10px 20px; color: #4a5568; font-size: 14px;
  transition: all .2s; white-space: nowrap;
}
.dropdown-menu a:hover {
  color: #00b4d8; background: rgba(0, 180, 216, 0.06); padding-left: 24px;
}

/* Mobile menu toggle */
.menu-toggle {
  display: none; flex-direction: column; gap: 5px; cursor: pointer;
  background: none; border: none; padding: 8px;
}
.menu-toggle span {
  display: block; width: 24px; height: 2px; background: #4a5568;
  transition: all .3s; border-radius: 1px;
}
.menu-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ===== Sections Common ===== */
.section {
  position: relative; z-index: 1;
  padding: 100px 24px;
}
.section-inner {
  max-width: 1200px; margin: 0 auto;
}
.section-header {
  text-align: center; margin-bottom: 60px;
}
.section-tag {
  display: inline-block; padding: 4px 16px; margin-bottom: 16px;
  background: rgba(0, 180, 216, 0.08); border: 1px solid rgba(0, 180, 216, 0.2);
  border-radius: 20px; font-size: 13px; color: #00b4d8; letter-spacing: 2px;
  text-transform: uppercase;
}
.section-title {
  font-size: 36px; font-weight: 700; color: #1a202c;
  margin-bottom: 16px; line-height: 1.3;
}
.section-title span { color: #00b4d8; }
.section-desc {
  font-size: 16px; color: #718096; max-width: 600px; margin: 0 auto;
}
.divider-line {
  width: 60px; height: 3px; margin: 20px auto 0;
  background: linear-gradient(90deg, #00b4d8, #00e0ff);
  border-radius: 2px;
}

/* ===== Hero Section ===== */
.hero {
  padding: 0;
  position: relative;
}

/* Top visual zone: rotating background + headline + intro */
.hero-visual {
  position: relative; overflow: hidden;
  min-height: 62vh;
  display: flex; align-items: center; justify-content: center;
  padding: 130px 24px 70px;
}

/* Hero background slider */
.hero-bg-slider {
  position: absolute; inset: 0; z-index: 0; overflow: hidden;
}
.hero-bg-slide {
  position: absolute; inset: 0;
  background-size: cover; background-position: center;
  opacity: 0; transition: opacity 1.8s ease-in-out;
  transform: scale(1.05);
}
.hero-bg-slide.active {
  opacity: 1;
  animation: heroBgZoom 6s ease-in-out forwards;
}
@keyframes heroBgZoom {
  from { transform: scale(1.05); }
  to { transform: scale(1); }
}
.hero-bg-overlay {
  position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(180deg,
    rgba(13, 71, 161, 0.5) 0%,
    rgba(13, 71, 161, 0.55) 50%,
    rgba(10, 50, 120, 0.7) 100%);
}

.hero-content {
  position: relative; z-index: 2;
  max-width: 900px; margin: 0 auto;
  text-align: center;
}

.hero-main-title {
  font-size: 30px; font-weight: 700; color: #ffffff;
  line-height: 1.5; margin-bottom: 18px;
  animation: fadeInUp .8s ease .15s both;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.35);
}
.hero-main-title .highlight-text {
  color: #4dd0e1;
}
.intro-divider {
  width: 50px; height: 3px; margin: 0 auto 26px;
  background: linear-gradient(90deg, #4dd0e1, #00e0ff);
  border-radius: 2px;
  animation: fadeInUp .8s ease .25s both;
}

/* Hero intro text */
.hero-intro {
  max-width: 760px; margin: 0 auto;
  text-align: left;
  animation: fadeInUp .8s ease .35s both;
}
.hero-intro p {
  font-size: 15px; line-height: 1.9; color: rgba(255, 255, 255, 0.92);
  margin-bottom: 12px;
  text-shadow: 0 1px 10px rgba(0, 0, 0, 0.3);
}
.hero-intro p:last-child {
  margin-bottom: 0;
}
.hero-intro .highlight {
  color: #4dd0e1; font-weight: 600;
}

/* Bottom zone: feature cards on light background */
.hero-cards {
  background: #f7fafc;
  padding: 48px 24px;
}

/* Feature cards grid */
.hero-features {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
  max-width: 900px; margin: 0 auto;
  animation: fadeInUp .8s ease .5s both;
}

/* ===== About Section ===== */
.about { background: #ffffff; }
.about-content {
  display: flex; flex-direction: column; align-items: center;
  max-width: 900px; margin: 0 auto;
}
.about-text {
  width: 100%;
}
.about-text p {
  font-size: 15px; line-height: 2; color: #4a5568;
  margin-bottom: 18px; text-indent: 2em;
}
.about-certs {
  display: flex; flex-direction: row; gap: 24px; justify-content: center;
  margin-top: 24px;
}
.about-certs .cert-item {
  background: #f7fafc;
  border: 1px solid #e2e8f0;
  border-radius: 10px; padding: 12px;
  transition: all .3s;
}
.about-certs .cert-item:hover {
  border-color: #00b4d8;
  background: rgba(0, 180, 216, 0.04);
}
.about-certs .cert-item img {
  max-width: 352px; height: auto;
  border-radius: 6px; display: block;
}
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 32px; border-radius: 8px; font-size: 16px; font-weight: 600;
  transition: all .3s; cursor: pointer; border: none;
}
.btn-primary {
  background: linear-gradient(135deg, #00b4d8 0%, #00e0ff 100%);
  color: #ffffff; box-shadow: 0 4px 20px rgba(0, 180, 216, 0.25);
}
.btn-primary:hover {
  transform: translateY(-2px); box-shadow: 0 8px 30px rgba(0, 180, 216, 0.35);
  color: #ffffff;
}
.btn-outline {
  background: transparent; color: #00b4d8;
  border: 1px solid rgba(0, 180, 216, 0.45);
}
.btn-outline:hover {
  background: rgba(0, 180, 216, 0.08); transform: translateY(-2px);
  border-color: #00b4d8; color: #0090b0;
}

/* ===== Feature Card Styles (reused in hero) ===== */
.about-feature-card {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 12px; padding: 20px 24px;
  transition: all .3s;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}
.about-feature-card:hover {
  border-color: #00b4d8;
  box-shadow: 0 8px 24px rgba(0, 180, 216, 0.12);
  transform: translateY(-4px);
}
.feature-icon {
  width: 40px; height: 40px; border-radius: 10px;
  background: linear-gradient(135deg, #e0f7fa, #b2ebf2);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; font-size: 18px;
}
.feature-header {
  display: flex; align-items: center; gap: 12px;
}
.feature-card-title {
  font-size: 15px; font-weight: 600; color: #1a202c; margin-bottom: 0;
}
.feature-card-desc {
  font-size: 13px; color: #718096; line-height: 1.6; margin-top: 10px;
}

/* ===== Products Section ===== */
.products-section {
  background: #f7fafc;
}
.products-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
}
.product-card {
  display: block; text-decoration: none; color: inherit;
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 16px; overflow: hidden;
  transition: all .4s; cursor: pointer;
  position: relative;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}
.product-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, #00b4d8, #00e0ff);
  opacity: 0; transition: opacity .3s;
}
.product-card:hover {
  transform: translateY(-8px);
  border-color: #00b4d8;
  box-shadow: 0 16px 48px rgba(0, 180, 216, 0.15);
}
.product-card:hover::before { opacity: 1; }
.product-img-wrap {
  width: 100%; height: 180px; overflow: hidden;
  background: #eef2f6;
  display: flex; align-items: center; justify-content: center;
  position: relative;
}
.product-img-wrap img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform .5s;
}
.product-card:hover .product-img-wrap img {
  transform: scale(1.05);
}
.product-info { padding: 20px; }
.product-name {
  font-size: 17px; font-weight: 600; color: #1a202c;
  margin-bottom: 8px; transition: color .3s;
}
.product-card:hover .product-name { color: #00b4d8; }
.product-brief {
  font-size: 13px; color: #718096; line-height: 1.6;
}
.product-link {
  display: inline-flex; align-items: center; gap: 6px;
  margin-top: 12px; font-size: 13px; color: #00b4d8;
  opacity: 0; transform: translateY(8px);
  transition: all .3s;
}
.product-card:hover .product-link {
  opacity: 1; transform: translateY(0);
}

/* Products intro paragraph */
.products-intro {
  max-width: 800px; margin: 0 auto 48px;
  text-align: center;
}
.products-intro p {
  font-size: 15px; line-height: 2; color: #4a5568;
}
.products-intro strong {
  color: #1a202c; font-weight: 600;
}


/* ===== Product Detail Overlay ===== */
.detail-overlay {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  z-index: 1500; pointer-events: none;
}
.detail-overlay.open { pointer-events: auto; }
.detail-overlay .detail-panel {
  position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background: #ffffff;
  transform: translateY(100%);
  transition: transform .45s cubic-bezier(0.22, 1, 0.36, 1);
  overflow: hidden; display: flex; flex-direction: column;
}
.detail-overlay.open .detail-panel { transform: translateY(0); }

.detail-header {
  position: relative; z-index: 10; flex-shrink: 0;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid #e2e8f0;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 24px; height: 56px;
}
.detail-close {
  width: 40px; height: 40px; border-radius: 10px;
  background: #f7fafc; border: 1px solid #e2e8f0;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; color: #4a5568; transition: all .3s; order: 2;
}
.detail-close:hover { background: rgba(0, 180, 216, 0.1); color: #00b4d8; }
.detail-nav-prev { order: 1; }
.detail-nav-next { order: 3; }
.detail-nav-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 16px; border-radius: 8px; font-size: 13px;
  color: #4a5568; background: #f7fafc;
  border: 1px solid #e2e8f0;
  cursor: pointer; transition: all .3s; white-space: nowrap;
}
.detail-nav-btn:hover {
  color: #00b4d8; background: rgba(0, 180, 216, 0.08);
  border-color: #00b4d8;
}

.detail-body {
  flex: 1; overflow-y: auto; padding: 40px 24px 60px;
  -webkit-overflow-scrolling: touch;
}
.detail-body-inner { max-width: 860px; margin: 0 auto; }

.detail-product-title {
  font-size: 32px; font-weight: 800; color: #1a202c;
  margin-bottom: 24px; line-height: 1.3;
  padding-bottom: 20px; border-bottom: 1px solid #e2e8f0;
}
.detail-product-img {
  width: 100%; max-height: 400px; object-fit: cover;
  border-radius: 12px; margin-bottom: 32px;
  box-shadow: 0 8px 30px rgba(0, 80, 200, 0.2);
}
.detail-intro-box {
  background: rgba(0, 180, 216, 0.06);
  border: 1px solid rgba(0, 180, 216, 0.15);
  border-radius: 12px; padding: 24px 28px;
  margin-bottom: 40px; font-size: 16px;
  color: #4a5568; line-height: 1.9;
}
.detail-intro-box p { margin-bottom: 8px; }
.detail-intro-box p:last-child { margin-bottom: 0; }

.detail-full-content { font-size: 16px; line-height: 1.9; color: #4a5568; }
.detail-full-content h4 {
  font-size: 17px; font-weight: 700; color: #00b4d8;
  margin: 32px 0 14px; padding-left: 14px;
  border-left: 3px solid #00b4d8; line-height: 1.5;
}
.detail-full-content p { margin-bottom: 16px; text-align: justify; }
.detail-full-content figure { margin: 24px 0; text-align: center; }
.detail-full-content figure img {
  max-width: 100%; border-radius: 8px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  transition: transform .3s, box-shadow .3s;
}
.detail-full-content figure img:hover {
  transform: scale(1.02);
  box-shadow: 0 8px 30px rgba(0, 100, 255, 0.25);
}
.detail-full-content .feature-list {
  list-style: none; padding: 0; margin: 20px 0 28px;
}
.detail-full-content .feature-list li {
  position: relative; padding: 8px 0 8px 28px;
  font-size: 15px; color: #4a5568; line-height: 1.7;
  border-bottom: 1px solid rgba(0, 180, 216, 0.06);
}
.detail-full-content .feature-list li:last-child { border-bottom: none; }
.detail-full-content .feature-list li::before {
  content: "➤"; position: absolute; left: 0; top: 8px;
  color: #00b4d8; font-size: 13px;
}

/* ===== Water Detail — Tagline / Solution / Highlight / Module / CTA ===== */
.detail-full-content .detail-tagline {
  font-size: 18px; color: #00b4d8; font-weight: 500;
  margin: 0 0 24px; line-height: 1.6; letter-spacing: 0.5px;
  padding: 14px 18px;
  background: linear-gradient(90deg, rgba(0, 180, 216, 0.10), rgba(0, 224, 255, 0.02));
  border-left: 3px solid #00b4d8; border-radius: 6px;
}
.detail-full-content .lead-paragraph {
  font-size: 16px; line-height: 2; color: #4a5568;
  margin-bottom: 24px;
}

/* Pain-point → solution cards */
.detail-full-content .solution-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px;
  margin: 16px 0 32px;
}
.detail-full-content .solution-card {
  background: rgba(0, 180, 216, 0.04);
  border: 1px solid rgba(0, 180, 216, 0.12);
  border-left: 3px solid #00b4d8;
  border-radius: 10px; padding: 16px 20px;
  transition: all .3s;
}
.detail-full-content .solution-card:hover {
  background: rgba(0, 180, 216, 0.08);
  border-left-color: #00d4ff;
  transform: translateX(4px);
}
.detail-full-content .solution-problem {
  font-size: 14px; color: #718096; margin-bottom: 10px;
  display: flex; align-items: flex-start; gap: 10px; line-height: 1.6;
}
.detail-full-content .solution-problem::before {
  content: '?'; display: inline-flex; align-items: center; justify-content: center;
  width: 22px; height: 22px; flex-shrink: 0;
  background: rgba(255, 107, 107, 0.14);
  border: 1px solid rgba(255, 107, 107, 0.32);
  color: #ff8a8a; border-radius: 50%;
  font-size: 13px; font-weight: 700; margin-top: 1px;
}
.detail-full-content .solution-answer {
  font-size: 14px; color: #4a5568; line-height: 1.85;
  display: flex; align-items: flex-start; gap: 10px;
}
.detail-full-content .solution-answer::before {
  content: '✓'; display: inline-flex; align-items: center; justify-content: center;
  width: 22px; height: 22px; flex-shrink: 0;
  background: rgba(0, 180, 216, 0.16);
  border: 1px solid rgba(0, 180, 216, 0.38);
  color: #00b4d8; border-radius: 50%;
  font-size: 12px; font-weight: 700; margin-top: 1px;
}
.detail-full-content .solution-answer strong {
  color: #1a202c; font-weight: 600;
  display: block; margin-bottom: 4px; font-size: 15px;
}

/* System highlight cards */
.detail-full-content .highlight-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px;
  margin: 16px 0 32px;
}
.detail-full-content .highlight-item {
  background: rgba(0, 180, 216, 0.05);
  border: 1px solid rgba(0, 180, 216, 0.13);
  border-radius: 10px; padding: 16px 18px;
  transition: all .3s;
}
.detail-full-content .highlight-item:hover {
  border-color: rgba(0, 180, 216, 0.32);
  background: rgba(0, 180, 216, 0.10);
  transform: translateY(-3px);
}
.detail-full-content .highlight-title {
  font-size: 15px; font-weight: 600; color: #00b4d8;
  margin-bottom: 8px; display: flex; align-items: center; gap: 8px;
}
.detail-full-content .highlight-title::before {
  content: ''; width: 6px; height: 6px; border-radius: 50%;
  background: linear-gradient(135deg, #00b4d8, #00e0ff);
  box-shadow: 0 0 8px rgba(0, 180, 216, 0.6);
}
.detail-full-content .highlight-desc {
  font-size: 13px; color: #718096; line-height: 1.75;
}

/* Core function modules */
.detail-full-content .module-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px;
  margin: 16px 0 32px;
}
.detail-full-content .module-card {
  background: #f7fafc;
  border: 1px solid rgba(0, 180, 216, 0.16);
  border-radius: 12px; padding: 18px 22px;
  transition: all .3s;
}
.detail-full-content .module-card:hover {
  border-color: rgba(0, 180, 216, 0.38);
  box-shadow: 0 8px 24px rgba(0, 100, 255, 0.15);
  transform: translateY(-2px);
}
.detail-full-content .module-title {
  font-size: 16px; font-weight: 700; color: #1a202c;
  padding-bottom: 10px; margin-bottom: 10px;
  border-bottom: 1px solid rgba(0, 180, 216, 0.15);
  display: flex; align-items: center; gap: 10px;
}
.detail-full-content .module-title::before {
  content: ''; width: 4px; height: 18px;
  background: linear-gradient(180deg, #00b4d8, #00d4ff);
  border-radius: 2px;
}
.detail-full-content .module-list {
  list-style: none; padding: 0; margin: 0;
}
.detail-full-content .module-list li {
  font-size: 13.5px; color: #4a5568; padding: 5px 0 5px 20px;
  position: relative; line-height: 1.6;
}
.detail-full-content .module-list li::before {
  content: ''; position: absolute; left: 6px; top: 13px;
  width: 6px; height: 6px; border-radius: 50%;
  background: rgba(0, 180, 216, 0.55);
}

/* Detail CTA */
.detail-full-content .detail-cta {
  margin: 36px 0 8px;
  padding: 30px 26px;
  background: linear-gradient(135deg, rgba(0, 180, 216, 0.12), rgba(0, 224, 255, 0.04));
  border: 1px solid rgba(0, 180, 216, 0.28);
  border-radius: 14px; text-align: center;
}
.detail-full-content .detail-cta .cta-text {
  font-size: 18px; color: #1a202c; font-weight: 600;
  margin-bottom: 20px; line-height: 1.5;
}
.detail-full-content .detail-cta .cta-buttons {
  display: flex; gap: 12px; justify-content: center; flex-wrap: wrap;
}
.detail-full-content .detail-cta .btn { padding: 11px 28px; font-size: 14px; }

/* Core function — 一个功能点一张配图 */
.detail-full-content .func-module { margin: 18px 0 26px; }
.detail-full-content .func-module-title {
  font-size: 15px; font-weight: 700; color: #1a202c;
  display: flex; align-items: center; gap: 10px; margin-bottom: 14px;
}
.detail-full-content .func-module-title::before {
  content: ''; width: 4px; height: 16px; flex-shrink: 0;
  background: linear-gradient(180deg, #00b4d8, #00d4ff); border-radius: 2px;
}
.detail-full-content .func-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px;
}
.detail-full-content .func-card {
  background: #ffffff;
  border: 1px solid rgba(0, 180, 216, 0.14);
  border-radius: 10px; overflow: hidden; transition: all .3s;
}
.detail-full-content .func-card:hover {
  border-color: rgba(0, 180, 216, 0.35);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0, 100, 255, 0.15);
}
.detail-full-content .func-thumb {
  position: relative; width: 100%; aspect-ratio: 16 / 10;
  background: #eef2f6;
  display: flex; align-items: center; justify-content: center; overflow: hidden;
}
.detail-full-content .func-ph {
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  font-size: 12px; color: #4a6076; letter-spacing: 1px;
}
.detail-full-content .func-thumb img {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; opacity: 0; transition: opacity .3s;
}
.detail-full-content .func-thumb img.loaded { opacity: 1; }
.detail-full-content .func-name {
  font-size: 13.5px; color: #4a5568; line-height: 1.5;
  padding: 10px 12px; text-align: center;
}

@media (max-width: 720px) {
  .detail-full-content .solution-grid,
  .detail-full-content .highlight-grid,
  .detail-full-content .module-grid { grid-template-columns: 1fr; }
  .detail-full-content .func-grid { grid-template-columns: repeat(2, 1fr); }
  .detail-full-content .detail-tagline { font-size: 15px; padding: 12px 14px; }
  .detail-full-content .detail-cta .cta-text { font-size: 15px; }
  .detail-full-content .detail-cta { padding: 22px 18px; }
}
@media (max-width: 420px) {
  .detail-full-content .func-grid { grid-template-columns: 1fr; }
}

.detail-bottom-nav {
  max-width: 860px; margin: 50px auto 0;
  display: flex; justify-content: space-between; gap: 16px;
  padding-top: 24px; border-top: 1px solid rgba(0, 180, 216, 0.1);
}
.detail-bottom-nav .detail-nav-btn { padding: 12px 20px; font-size: 14px; }

@media (max-width: 768px) {
  .detail-body { padding: 24px 16px 40px; }
  .detail-product-title { font-size: 24px; }
  .detail-header { padding: 0 16px; height: 50px; }
  .detail-nav-btn { padding: 6px 10px; font-size: 12px; }
  .detail-bottom-nav { flex-direction: column; }
}


/* ===== Advantages Section ===== */
.advantages { background: #f7fafc; }
.adv-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px;
}
.adv-card {
  text-align: center; padding: 40px 30px;
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 16px; transition: all .4s;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}
.adv-card:hover {
  border-color: #00b4d8;
  background: rgba(0, 180, 216, 0.02);
  box-shadow: 0 12px 32px rgba(0, 180, 216, 0.1);
  transform: translateY(-6px);
}
.adv-icon {
  width: 64px; height: 64px; margin: 0 auto 20px;
  background: linear-gradient(135deg, #e0f7fa, #b2ebf2);
  border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  font-size: 28px;
}
.adv-title {
  font-size: 18px; font-weight: 600; color: #1a202c; margin-bottom: 10px;
}
.adv-desc {
  font-size: 14px; color: #718096; line-height: 1.7;
}

/* ===== Contact Section ===== */
.contact-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 40px;
}
.contact-info-list { display: flex; flex-direction: column; gap: 24px; }
.contact-item {
  display: flex; gap: 16px; align-items: flex-start;
  padding: 20px; background: #f7fafc;
  border: 1px solid #e2e8f0; border-radius: 12px;
  transition: all .3s;
}
.contact-item:hover {
  border-color: #00b4d8;
  background: rgba(0, 180, 216, 0.04);
}
.contact-icon {
  width: 44px; height: 44px; flex-shrink: 0;
  background: linear-gradient(135deg, #e0f7fa, #b2ebf2);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
}
.contact-icon svg { width: 20px; height: 20px; fill: #00b4d8; }
.contact-label { font-size: 13px; color: #718096; margin-bottom: 4px; }
.contact-value { font-size: 16px; color: #1a202c; font-weight: 500; }

.contact-form-wrap {
  background: #f7fafc;
  border: 1px solid #e2e8f0;
  border-radius: 16px; padding: 32px;
  display: flex; flex-direction: column; gap: 16px;
}
.contact-form-wrap .form-title {
  font-size: 18px; color: #1a202c; font-weight: 600;
  margin-bottom: 4px;
}
.contact-form-wrap .form-row {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
}
.contact-form-wrap .form-group {
  display: flex; flex-direction: column; gap: 6px;
}
.contact-form-wrap .form-group.full-width {
  grid-column: 1 / -1;
}
.contact-form-wrap label {
  font-size: 13px; color: #4a5568;
}
.contact-form-wrap label .required {
  color: #ff6b6b; margin-left: 2px;
}
.contact-form-wrap input,
.contact-form-wrap textarea {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 8px; padding: 10px 14px;
  color: #1a202c; font-size: 14px; font-family: inherit;
  transition: border-color .3s, background .3s;
  outline: none; resize: vertical;
}
.contact-form-wrap input::placeholder,
.contact-form-wrap textarea::placeholder {
  color: #a0aec0;
}
.contact-form-wrap input:focus,
.contact-form-wrap textarea:focus {
  border-color: #00b4d8;
  background: #ffffff;
}
.contact-form-wrap textarea {
  min-height: 90px;
}
.contact-form-wrap .submit-btn {
  align-self: flex-start;
  background: linear-gradient(135deg, #00b4d8, #00e0ff);
  color: #ffffff; border: none; border-radius: 8px;
  padding: 11px 36px; font-size: 15px; font-weight: 600;
  cursor: pointer; transition: opacity .3s, transform .2s;
  font-family: inherit;
}
.contact-form-wrap .submit-btn:hover {
  opacity: 0.9; transform: translateY(-1px);
}
.contact-form-wrap .submit-btn:disabled {
  opacity: 0.5; cursor: not-allowed; transform: none;
}
.form-msg {
  font-size: 13px; padding: 8px 12px; border-radius: 6px;
  display: none;
}
.form-msg.success {
  display: block; color: #4ade80;
  background: rgba(74, 222, 128, 0.08);
  border: 1px solid rgba(74, 222, 128, 0.2);
}
.form-msg.error {
  display: block; color: #ff6b6b;
  background: rgba(255, 107, 107, 0.08);
  border: 1px solid rgba(255, 107, 107, 0.2);
}

/* ===== Footer ===== */
.footer {
  position: relative; z-index: 1;
  border-top: 1px solid #e2e8f0;
  padding: 40px 24px;
  background: #ffffff;
}
.footer-inner {
  max-width: 1200px; margin: 0 auto;
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 20px;
}
.footer-left p { font-size: 13px; color: #718096; line-height: 1.8; }
.footer-left a { color: #4a5568; }
.footer-left a:hover { color: #00b4d8; }
.footer-right { display: flex; gap: 12px; }
.footer-social {
  width: 36px; height: 36px; border-radius: 8px;
  background: #f7fafc;
  border: 1px solid #e2e8f0;
  display: flex; align-items: center; justify-content: center;
  transition: all .3s; cursor: pointer;
}
.footer-social:hover {
  background: rgba(0, 180, 216, 0.08);
  border-color: #00b4d8;
}
.footer-social svg { width: 16px; height: 16px; fill: #718096; }

/* ===== Animations ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes gradientShift {
  0%, 100% { background-position: 0% center; }
  50% { background-position: 200% center; }
}

/* Scroll reveal */
.reveal {
  opacity: 0; transform: translateY(40px);
  transition: opacity .8s ease, transform .8s ease;
}
.reveal.visible {
  opacity: 1; transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .products-grid { grid-template-columns: repeat(2, 1fr); }
  .adv-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .nav-links {
    display: none; position: fixed; top: 70px; left: 0; right: 0;
    background: rgba(255, 255, 255, 0.98); backdrop-filter: blur(14px);
    flex-direction: column; padding: 20px; gap: 4px;
    border-bottom: 1px solid #e2e8f0;
    max-height: calc(100vh - 70px); overflow-y: auto;
  }
  .nav-links.open { display: flex; }
  .nav-links li a { padding: 12px 16px; font-size: 16px; }
  .nav-dropdown .dropdown-menu {
    position: static; transform: none; opacity: 1; visibility: visible;
    box-shadow: none; border: none; background: #f7fafc;
    border-radius: 8px; margin-top: 4px; padding: 4px 0;
    display: none;
  }
  .nav-dropdown.open .dropdown-menu { display: block; }
  .menu-toggle { display: flex; }

  .hero-main-title { font-size: 24px; }
  .hero-intro p { font-size: 14px; text-indent: 0; }
  .about-certs { gap: 16px; }
  .about-certs .cert-item img { max-width: 200px; }

  .section { padding: 60px 16px; }
  .section-title { font-size: 28px; }

  .products-grid { grid-template-columns: 1fr; gap: 16px; }
  .adv-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .contact-form-wrap .form-row { grid-template-columns: 1fr; }
  .contact-form-wrap { padding: 24px 20px; }
  .hero-features { grid-template-columns: 1fr; gap: 12px; }
  .hero-intro p { font-size: 14px; }

  .footer-inner { flex-direction: column; text-align: center; }

}
@media (max-width: 480px) {
  .hero-main-title { font-size: 20px; }
  .btn { width: 100%; justify-content: center; }
  .nav-logo img { height: 32px; }
}