/* ============================================
   常州永乐环境工程有限公司 - 全站样式
   SEO优化 / 响应式设计 / 百度友好
   ============================================ */

/* --- CSS Variables --- */
:root {
  --primary: #1a56a0;
  --primary-dark: #0d3b6e;
  --primary-light: #e8f0fe;
  --accent: #00a870;
  --accent-hover: #008c5d;
  --text-primary: #333333;
  --text-secondary: #666666;
  --text-light: #999999;
  --bg-white: #ffffff;
  --bg-light: #f7f8fa;
  --bg-gray: #f0f2f5;
  --border-color: #e5e7eb;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --max-width: 1200px;
  --transition: all 0.3s ease;
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: var(--text-primary);
  background: var(--bg-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-dark); }
ul, ol { list-style: none; }

/* --- Container --- */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }

/* --- Header --- */
.site-header {
  background: var(--bg-white);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.logo { display: flex; align-items: center; gap: 10px; font-size: 22px; font-weight: 700; color: var(--primary); }
.logo-icon { width: 40px; height: 40px; background: linear-gradient(135deg, var(--primary), var(--accent)); border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center; color: white; font-size: 20px; }
.logo span { color: var(--text-primary); font-weight: 400; font-size: 14px; margin-left: 8px; }

/* Navigation */
.main-nav { display: flex; gap: 32px; }
.main-nav a {
  font-size: 15px;
  color: var(--text-primary);
  font-weight: 500;
  padding: 24px 0;
  position: relative;
  transition: var(--transition);
}
.main-nav a::after {
  content: '';
  position: absolute;
  bottom: 16px;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--primary);
  border-radius: 2px;
  transform: scaleX(0);
  transition: transform 0.25s ease;
}
.main-nav a:hover,
.main-nav a.active { color: var(--primary); }
.main-nav a:hover::after,
.main-nav a.active::after { transform: scaleX(1); }

.header-cta {
  background: var(--primary);
  color: white !important;
  padding: 10px 24px !important;
  border-radius: var(--radius-sm);
  font-size: 14px !important;
  font-weight: 600;
  transition: var(--transition) !important;
}
.header-cta:hover { background: var(--primary-dark) !important; transform: translateY(-1px); }
.header-cta::after { display: none !important; }

.mobile-menu-btn { display: none; background: none; border: none; font-size: 28px; cursor: pointer; color: var(--text-primary); padding: 8px; }

/* --- Nav Slogan (next to logo) --- */
.nav-slogan {
  margin-left: 20px;
  padding: 6px 16px;
  background: linear-gradient(135deg, #e53935 0%, #ff6f00 100%);
  border-radius: 20px;
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  white-space: nowrap;
  box-shadow: 0 2px 8px rgba(229, 57, 53, 0.3);
  animation: navSloganPulse 2s ease-in-out infinite;
}
.nav-slogan em {
  font-style: normal;
  color: #ffeb3b;
  text-shadow: 0 1px 2px rgba(0,0,0,0.2);
}
@keyframes navSloganPulse {
  0%, 100% { transform: scale(1); box-shadow: 0 2px 8px rgba(229, 57, 53, 0.3); }
  50% { transform: scale(1.02); box-shadow: 0 4px 12px rgba(229, 57, 53, 0.5); }
}
@media (max-width: 992px) {
  .nav-slogan { display: none; }
}

/* --- Slogan Banner --- */
.slogan-banner {
  background: linear-gradient(90deg, var(--primary-dark) 0%, var(--primary) 40%, #2a73c9 70%, var(--accent) 100%);
  padding: 10px 0;
  text-align: center;
  overflow: hidden;
  position: relative;
}
.slogan-banner::before {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 50%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.08), transparent);
  animation: sloganShine 4s ease-in-out infinite;
}
@keyframes sloganShine {
  0% { left: -100%; }
  100% { left: 200%; }
}
.slogan-banner p {
  margin: 0;
  font-size: 20px;
  font-weight: 700;
  color: #fff;
  letter-spacing: 6px;
  text-shadow: 0 1px 4px rgba(0,0,0,0.2);
  position: relative;
  z-index: 1;
}
.slogan-banner p em {
  font-style: normal;
  color: #ffe066;
  text-shadow: 0 1px 6px rgba(0,0,0,0.3);
}
@media (max-width: 768px) {
  .slogan-banner { padding: 8px 0; }
  .slogan-banner p { font-size: 15px; letter-spacing: 3px; }
}

/* --- Hero Section --- */
.hero {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, #2a73c9 100%);
  color: white;
  padding: 80px 0 60px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(255,255,255,0.08) 0%, transparent 70%);
  border-radius: 50%;
}
.hero-content { position: relative; z-index: 1; }
.hero h1 { font-size: 42px; font-weight: 700; margin-bottom: 16px; letter-spacing: -0.5px; }
.hero h1 em { font-style: normal; color: #4fc3f7; }
.hero p { font-size: 18px; opacity: 0.9; max-width: 600px; margin-bottom: 32px; line-height: 1.8; }
.hero-stats { display: flex; gap: 48px; margin-top: 40px; }
.stat-item .stat-num { font-size: 36px; font-weight: 700; color: #4fc3f7; }
.stat-item .stat-label { font-size: 14px; opacity: 0.75; }

/* --- Section Common --- */
.section { padding: 64px 0; }
.section-gray { background: var(--bg-light); }
.section-title {
  text-align: center;
  margin-bottom: 48px;
}
.section-title h2 {
  font-size: 32px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}
.section-title p {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}
.section-title .title-line {
  width: 48px;
  height: 4px;
  background: linear-gradient(to right, var(--primary), var(--accent));
  border-radius: 2px;
  margin: 16px auto 0;
}

/* --- Product Grid --- */
.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.product-card {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border: 1px solid var(--border-color);
}
.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.product-card-img {
  height: 220px;
  background: var(--bg-gray);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}
.product-card-img img { width: 100%; height: 100%; object-fit: contain; background: var(--bg-gray); transition: transform 0.4s ease; }
.product-card:hover .product-card-img img { transform: scale(1.05); }

/* Fix: constrain card images without product-card-img wrapper */
.product-card a {
  display: block;
  overflow: hidden;
  position: relative;
}
.product-card a img {
  width: 100% !important;
  height: 220px !important;
  object-fit: contain !important;
  object-position: center !important;
  display: block !important;
  transition: transform 0.4s ease;
  flex-shrink: 0;
}
.product-card:hover a img { transform: scale(1.03); }
.product-card-tag {
  position: absolute;
  top: 12px;
  left: 12px;
  background: var(--accent);
  color: white;
  font-size: 12px;
  padding: 4px 12px;
  border-radius: 20px;
  font-weight: 600;
}
.product-card-body { padding: 20px; }
.product-card-body h3 { font-size: 18px; font-weight: 600; margin-bottom: 8px; }
.product-card-body h3 a { color: var(--text-primary); }
.product-card-body h3 a:hover { color: var(--primary); }
.product-card-body p { font-size: 14px; color: var(--text-secondary); margin-bottom: 14px; line-height: 1.6; }
.product-card-specs { display: flex; flex-wrap: wrap; gap: 8px; }
.spec-badge {
  font-size: 12px;
  color: var(--text-light);
  background: var(--bg-gray);
  padding: 4px 10px;
  border-radius: 20px;
}

/* --- Product Detail Page --- */
.breadcrumb {
  padding: 16px 0;
  font-size: 14px;
  color: var(--text-light);
}
.breadcrumb a { color: var(--text-secondary); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span { margin: 0 8px; }

.product-detail { padding: 40px 0 64px; }
.pd-top { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.pd-gallery {
  position: sticky;
  top: 88px;
  align-self: start;
}
.pd-main-img {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-color);
  background: var(--bg-gray);
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
}
.pd-main-img img { width: 100%; height: 100%; object-fit: contain; padding: 20px; }
.pd-info h1 {
  font-size: 30px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
}
.pd-info .pd-subtitle {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 24px;
  line-height: 1.6;
}
.pd-tags { display: flex; gap: 10px; margin-bottom: 24px; flex-wrap: wrap; }
.pd-tag {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
}
.pd-tag-blue { background: var(--primary-light); color: var(--primary); }
.pd-tag-green { background: #e8faf0; color: var(--accent); }
.pd-contact-bar {
  background: linear-gradient(135deg, var(--primary), #2a73c9);
  color: white;
  padding: 24px;
  border-radius: var(--radius-lg);
  margin-top: 24px;
}
.pd-contact-bar h4 { font-size: 18px; margin-bottom: 8px; }
.pd-contact-bar p { font-size: 14px; opacity: 0.9; margin-bottom: 4px; }
.pd-contact-bar .phone-big { font-size: 26px; font-weight: 700; margin: 12px 0; }
.pd-contact-bar .cta-btn {
  display: inline-block;
  background: white;
  color: var(--primary);
  padding: 12px 32px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 15px;
  margin-top: 12px;
  transition: var(--transition);
}
.pd-contact-bar .cta-btn:hover { transform: translateY(-2px); box-shadow: 0 4px 15px rgba(0,0,0,0.2); }

/* Product Sections */
.pd-section { margin-bottom: 48px; }
.pd-section h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 20px;
  padding-left: 16px;
  border-left: 4px solid var(--primary);
}
.pd-desc { font-size: 15px; color: var(--text-secondary); line-height: 1.9; }
.pd-desc p { margin-bottom: 12px; }

/* Specs Table */
.specs-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.specs-table th,
.specs-table td {
  padding: 14px 20px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
  font-size: 14px;
}
.specs-table th {
  background: var(--primary);
  color: white;
  font-weight: 600;
  width: 35%;
}
.specs-table tr:last-child td { border-bottom: none; }
.specs-table tr:nth-child(even) td { background: var(--bg-light); }

/* Features Grid */
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature-item {
  background: var(--bg-white);
  padding: 28px 24px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}
.feature-item:hover { border-color: var(--primary); box-shadow: var(--shadow-md); }
.feature-icon {
  width: 52px;
  height: 52px;
  background: var(--primary-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  margin-bottom: 16px;
}
.feature-item h4 { font-size: 17px; font-weight: 600; margin-bottom: 8px; }
.feature-item p { font-size: 14px; color: var(--text-secondary); line-height: 1.6; }

/* Scenarios */
.scenario-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.scenario-item {
  text-align: center;
  padding: 24px 16px;
  border-radius: var(--radius-md);
  background: var(--bg-white);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}
.scenario-item:hover { border-color: var(--accent); transform: translateY(-2px); }
.scenario-icon { font-size: 36px; margin-bottom: 12px; }
.scenario-item h4 { font-size: 15px; font-weight: 600; margin-bottom: 6px; }
.scenario-item p { font-size: 13px; color: var(--text-secondary); }

/* FAQ */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
}
.faq-q {
  padding: 18px 24px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  background: var(--bg-white);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
}
.faq-q:hover { background: var(--bg-light); }
.faq-a {
  padding: 0 24px 18px;
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.8;
  display: none;
}
.faq-item.open .faq-a { display: block; }
.faq-q .faq-toggle { font-size: 20px; color: var(--text-light); transition: transform 0.3s; }
.faq-item.open .faq-q .faq-toggle { transform: rotate(45deg); }

/* --- About Section --- */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.about-text h3 { font-size: 24px; margin-bottom: 16px; }
.about-text p { color: var(--text-secondary); line-height: 1.9; margin-bottom: 16px; }
.about-numbers { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-top: 24px; }
.about-num { text-align: center; padding: 20px; background: var(--bg-light); border-radius: var(--radius-md); }
.about-num .num { font-size: 32px; font-weight: 700; color: var(--primary); }
.about-num .label { font-size: 13px; color: var(--text-secondary); margin-top: 4px; }

/* --- News List --- */
.news-list { max-width: 900px; margin: 0 auto; }
.news-item {
  display: flex;
  gap: 24px;
  padding: 24px 0;
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}
.news-item:hover { background: var(--bg-light); margin: 0 -20px; padding: 24px 20px; border-radius: var(--radius-md); }
.news-date {
  min-width: 80px;
  text-align: center;
  padding: 12px;
  background: var(--primary-light);
  border-radius: var(--radius-md);
}
.news-date .day { font-size: 28px; font-weight: 700; color: var(--primary); }
.news-date .month { font-size: 13px; color: var(--text-secondary); }
.news-info h3 { font-size: 17px; font-weight: 600; margin-bottom: 6px; }
.news-info h3 a { color: var(--text-primary); }
.news-info h3 a:hover { color: var(--primary); }
.news-info p { font-size: 14px; color: var(--text-secondary); line-height: 1.6; }

/* --- Contact --- */
.contact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.contact-card {
  background: var(--bg-white);
  padding: 32px 24px;
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}
.contact-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.contact-icon { font-size: 42px; margin-bottom: 16px; }
.contact-card h4 { font-size: 18px; font-weight: 600; margin-bottom: 8px; }
.contact-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; }
.contact-card .contact-value { font-size: 18px; font-weight: 600; color: var(--primary); margin-top: 8px; }

/* --- Footer --- */
.site-footer {
  background: #1a2332;
  color: rgba(255,255,255,0.7);
  padding: 48px 0 24px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 32px; }
.footer-brand h3 { color: white; font-size: 20px; margin-bottom: 12px; }
.footer-brand p { font-size: 14px; line-height: 1.7; margin-bottom: 12px; }
.footer-col h4 { color: white; font-size: 16px; margin-bottom: 16px; }
.footer-col a { display: block; color: rgba(255,255,255,0.65); font-size: 14px; padding: 5px 0; transition: var(--transition); }
.footer-col a:hover { color: white; padding-left: 4px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 20px;
  text-align: center;
  font-size: 13px;
  color: rgba(255,255,255,0.45);
}

/* --- CTA Banner --- */
.cta-banner {
  background: linear-gradient(135deg, var(--accent), #00c987);
  color: white;
  padding: 56px 0;
  text-align: center;
}
.cta-banner h2 { font-size: 30px; margin-bottom: 12px; }
.cta-banner p { font-size: 16px; opacity: 0.9; margin-bottom: 24px; }
.cta-banner .btn-white {
  display: inline-block;
  background: white;
  color: var(--accent);
  padding: 14px 40px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 16px;
  transition: var(--transition);
}
.cta-banner .btn-white:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,0,0,0.15); }

/* ============================================
   RESPONSIVE - Mobile & Tablet Optimized
   ============================================ */

/* Tablet: 768px - 1024px */
@media (max-width: 1024px) {
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .scenario-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .hero h1 { font-size: 34px; }
  .about-grid { grid-template-columns: 1fr; }
  .product-detail-grid { grid-template-columns: 1fr !important; }
  .hero-stats { gap: 28px; }
}

/* Mobile: ≤768px — Full mobile-first enhancements */
@media (max-width: 768px) {

  /* Header: compact height, hamburger visible */
  .site-header { position: sticky; top: 0; z-index: 1000; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
  .header-inner { height: 56px; }
  .logo { font-size: 18px; }
  .logo-icon { width: 34px; height: 34px; font-size: 16px; }
  .logo span { display: none; }

  /* Hamburger button — always visible on mobile */
  .mobile-menu-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-primary);
    font-size: 26px;
    padding: 0;
    border-radius: 6px;
    transition: background 0.2s;
  }
  .mobile-menu-btn:hover { background: var(--bg-gray); }

  /* Mobile nav overlay */
  .main-nav {
    display: none;
    position: fixed;
    top: 56px;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 999;
    flex-direction: column;
    padding: 0;
    gap: 0;
    animation: fadeIn 0.2s ease;
  }
  .main-nav.open { display: flex; }

  .main-nav > a {
    display: block !important;
    background: white;
    padding: 16px 24px !important;
    border-bottom: 1px solid var(--border-color);
    font-size: 16px !important;
    font-weight: 500;
    color: var(--text-primary) !important;
    border-radius: 0;
    transform: none !important;
  }
  .main-nav > a::after { display: none !important; }
  .main-nav > a:hover { background: var(--bg-light) !important; color: var(--primary) !important; }
  .main-nav > a.header-cta {
    display: block !important;
    background: var(--primary) !important;
    color: white !important;
    text-align: center;
    font-weight: 600 !important;
    border-radius: 0;
    padding: 16px 24px !important;
    border-bottom: none;
  }

  /* Hero: compact mobile layout */
  .hero { padding: 36px 0 32px; }
  .hero::before { top: -30%; right: -40%; width: 400px; height: 400px; }
  .hero h1 { font-size: 24px; line-height: 1.3; }
  .hero p { font-size: 14px; line-height: 1.7; margin-bottom: 24px; }
  .hero-stats { flex-direction: column; gap: 16px; margin-top: 28px; }
  .stat-item { display: flex; align-items: baseline; gap: 10px; }
  .stat-item .stat-num { font-size: 28px; }
  .stat-item .stat-label { font-size: 13px; }

  /* Buttons on mobile */
  .btn-primary, .hero .btn {
    display: block;
    width: 100%;
    text-align: center;
    padding: 14px 24px;
    font-size: 15px;
  }
  .hero .cta-group { flex-direction: column; }

  /* Product grid: single column */
  .product-grid { grid-template-columns: 1fr; gap: 16px; }
  .product-card-img { height: 180px; }
  .product-card a img { height: 180px !important; }
  .product-card-body { padding: 16px; }
  .product-card-body h3 { font-size: 16px; }

  /* Filter bar: horizontal scroll */
  .container > div[style*="flex-wrap"] {
    flex-wrap: nowrap !important;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding-bottom: 4px;
  }
  .container > div[style*="flex-wrap"]::-webkit-scrollbar { display: none; }
  .filter-btn {
    flex-shrink: 0;
    padding: 7px 16px;
    font-size: 13px;
  }

  /* Product detail page: full-width stacked */
  .product-detail-grid { grid-template-columns: 1fr !important; gap: 20px !important; }
  .product-gallery { position: static !important; }
  .product-info h1 { font-size: 22px; }
  .product-info .product-info { padding: 0; }

  /* Stats grid: 2 cols */
  .product-info > div[style*="grid-template-columns:1fr 1fr"] {
    grid-template-columns: 1fr 1fr !important;
    gap: 10px !important;
  }
  .product-info > div[style*="grid-template-columns:1fr 1fr"] > div {
    padding: 10px !important;
  }
  .product-info > div[style*="grid-template-columns:1fr 1fr"] > div > div:first-child {
    font-size: 18px !important;
  }

  /* Features: 1 column */
  .features-grid { grid-template-columns: 1fr; gap: 16px; }

  /* Scenarios: 2 columns */
  .scenario-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .scenario-item { padding: 16px 10px; }

  /* FAQ */
  .faq-list { padding: 0 4px; }
  .faq-item { margin-bottom: 10px; }
  .faq-q { padding: 14px 16px; font-size: 15px; }
  .faq-a { padding: 0 16px 14px; font-size: 14px; }

  /* About */
  .about-grid { grid-template-columns: 1fr; gap: 28px; }
  .about-numbers { grid-template-columns: 1fr 1fr; gap: 12px; }
  .about-num { padding: 16px 12px; }
  .about-num .num { font-size: 26px; }

  /* Contact */
  .contact-grid { grid-template-columns: 1fr; gap: 16px; }
  .contact-card { padding: 24px 20px; }

  /* Footer */
  .footer-grid { grid-template-columns: 1fr; gap: 24px; padding: 0 4px; }
  .footer-brand { padding-bottom: 16px; border-bottom: 1px solid rgba(255,255,255,0.08); }

  /* CTA Banner */
  .cta-banner { padding: 36px 0; }
  .cta-banner h2 { font-size: 22px; }
  .cta-banner p { font-size: 14px; padding: 0 12px; }
  .cta-banner .btn-white { padding: 12px 32px; font-size: 15px; }

  /* General */
  .section { padding: 32px 0; }
  .section-title h2 { font-size: 22px; }
  .section-title p { font-size: 14px; }
  .container { padding: 0 16px; }

  /* Specs table: horizontal scroll */
  .specs-table { font-size: 13px; }
  .specs-table th, .specs-table td { padding: 10px 12px; }

  /* Breadcrumb */
  nav[style*="background:var(--bg-gray)"] { padding: 10px 0; font-size: 12px; }

  /* Section titles with left border */
  .pd-section h2 { font-size: 20px; }

  /* Back to top button */
  #backToTop {
    position: fixed;
    bottom: 80px;
    right: 16px;
    width: 44px;
    height: 44px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    z-index: 900;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.3s, transform 0.3s;
    opacity: 0;
    pointer-events: none;
  }
  #backToTop.visible { opacity: 1; pointer-events: auto; }
  #backToTop:hover { background: var(--primary-dark); transform: translateY(-2px); }

  /* Mobile sticky bottom CTA bar */
  .mobile-bottom-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: white;
    border-top: 1px solid var(--border-color);
    padding: 10px 16px;
    display: flex;
    gap: 10px;
    z-index: 998;
    box-shadow: 0 -2px 12px rgba(0,0,0,0.08);
  }
  .mobile-bottom-bar a {
    flex: 1;
    display: block;
    text-align: center;
    padding: 12px;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s;
  }
  .mobile-bottom-bar .bar-tel {
    background: var(--primary);
    color: white;
  }
  .mobile-bottom-bar .bar-chat {
    background: var(--accent);
    color: white;
  }
  /* Add bottom padding to body so content isn't hidden behind the bar */
  body { padding-bottom: 72px; }
}

/* Super small screens: 375px and below */
@media (max-width: 375px) {
  .hero h1 { font-size: 20px; }
  .section-title h2 { font-size: 20px; }
  .product-info h1 { font-size: 20px; }
}

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

/* --- Utility --- */
.text-center { text-align: center; }
.mt-20 { margin-top: 20px; }
.mb-20 { margin-bottom: 20px; }
.mb-40 { margin-bottom: 40px; }