:root {
  /* ═══ Clean Light Base ═══ */
  --bg-darkest: #FFFFFF;
  --bg-dark: #F7F8FA;
  --bg-medium: #F0F2F5;
  --bg-card: #FFFFFF;
  --bg-card-hover: #F8F9FB;
  --bg-input: #F5F6F8;

  /* ═══ Blue Accent ═══ */
  --accent: #2563EB;
  --accent-light: #3B82F6;
  --accent-dark: #1D4ED8;
  --accent-glow: rgba(37, 99, 235, 0.15);
  --accent-gradient: linear-gradient(135deg, #2563EB 0%, #06B6D4 100%);

  /* ═══ Highlight ═══ */
  --highlight: #06B6D4;
  --highlight-glow: rgba(6, 182, 212, 0.1);

  /* ═══ Steel / Neutral ═══ */
  --steel: #94A3B8;
  --steel-light: #CBD5E1;
  --steel-dark: #64748B;

  /* ═══ Text ═══ */
  --text-primary: #1E293B;
  --text-secondary: #64748B;
  --text-muted: #94A3B8;

  /* ═══ Border ═══ */
  --border: #E2E8F0;
  --border-light: #F1F5F9;

  /* ═══ Font ═══ */
  --font-display: 'Chakra Petch', 'Microsoft YaHei', 'PingFang SC', sans-serif;
  --font-body: 'Barlow', 'Microsoft YaHei', 'PingFang SC', sans-serif;

  /* ═══ Spacing ═══ */
  --section-py: 100px;
  --container-max: 1200px;
  --radius: 8px;
  --radius-lg: 16px;

  /* ═══ Transition ═══ */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --duration: 0.3s;

  /* ═══ Shadow ═══ */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.1);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.12);
}

/* ================================
   2. Reset & Base
   ================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-body);
  background: var(--bg-darkest);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}

::selection {
  background: var(--accent);
  color: #FFFFFF;
}

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-medium); }
::-webkit-scrollbar-thumb { background: var(--steel-light); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; transition: color var(--duration) var(--ease); }
a:hover { color: var(--accent-dark); }

ul, ol { list-style: none; }

/* ================================
   3. Typography
   ================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
}

h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.8rem, 4vw, 2.8rem); }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.6rem); }
h4 { font-size: 1.1rem; }

.section-label {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
  padding: 4px 12px;
  border: 1px solid rgba(37, 99, 235, 0.2);
  border-radius: 4px;
  background: rgba(37, 99, 235, 0.05);
}

.section-title {
  margin-bottom: 1rem;
  position: relative;
}

.section-desc {
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto 3rem;
  font-size: 1.05rem;
}

.text-accent { color: var(--accent); }
.text-muted { color: var(--text-muted); }

/* ================================
   4. Layout & Container
   ================================ */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: var(--section-py) 0;
  position: relative;
}

/* Subtle grid pattern for light sections */
.grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(37,99,235,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37,99,235,0.02) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: 0;
}

.grid-bg > * { position: relative; z-index: 1; }

/* Hazard stripe divider - light version */
.hazard-divider {
  height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--highlight), var(--accent));
  opacity: 0.3;
  border-radius: 2px;
  margin: 0 24px;
}

/* ================================
   5. Navigation
   ================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 0 24px;
  transition: all var(--duration) var(--ease);
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 20px rgba(0,0,0,0.06);
}

.navbar-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
}

.nav-logo .logo-icon {
  width: 40px;
  height: 40px;
  background: var(--accent-gradient);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: #FFFFFF;
  font-weight: 800;
  box-shadow: 0 2px 8px var(--accent-glow);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-links a {
  padding: 8px 16px;
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.03em;
  border-radius: var(--radius);
  transition: all var(--duration) var(--ease);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
  background: rgba(37, 99, 235, 0.06);
}

.nav-phone {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: var(--accent-gradient);
  color: #FFFFFF !important;
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 700;
  border-radius: var(--radius);
  letter-spacing: 0.02em;
  transition: all var(--duration) var(--ease);
  box-shadow: 0 2px 8px var(--accent-glow);
}

.nav-phone:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 20px var(--accent-glow);
  color: #FFFFFF !important;
}

.nav-phone svg { width: 16px; height: 16px; }

/* Mobile menu button */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--duration) var(--ease);
}

/* ================================
   6. Hero Section
   ================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: linear-gradient(135deg, #F0F5FF 0%, #FFFFFF 40%, #F0FDFA 100%);
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(37,99,235,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37,99,235,0.03) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

/* Particle canvas container */
.hero-particles {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.hero-particles canvas {
  width: 100%;
  height: 100%;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 120px;
  background: linear-gradient(to top, var(--bg-darkest), transparent);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(37, 99, 235, 0.08);
  border: 1px solid rgba(37, 99, 235, 0.15);
  border-radius: 100px;
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 24px;
}

.hero-badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse-dot 2s infinite;
}

.hero h1 {
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}

.hero h1 .accent {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 580px;
  margin-bottom: 36px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  gap: 48px;
  margin-top: 64px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}

.hero-stat .number {
  font-family: var(--font-display);
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
}

.hero-stat .number span {
  font-size: 1.2rem;
  color: var(--highlight);
}

.hero-stat .label {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-top: 6px;
}

/* ================================
   7. Buttons
   ================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  font-family: var(--font-display);
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--duration) var(--ease);
  text-decoration: none;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #FFFFFF;
  box-shadow: 0 2px 8px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px var(--accent-glow);
  color: #FFFFFF;
}

.btn-outline {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
}

.btn-outline:hover {
  background: rgba(37, 99, 235, 0.06);
  border-color: var(--accent-dark);
  color: var(--accent-dark);
}

.btn-lg {
  padding: 14px 36px;
  font-size: 1rem;
}

/* ================================
   8. Product Cards
   ================================ */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.product-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.4s var(--ease);
  box-shadow: var(--shadow-sm);
}

.product-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent-gradient);
  opacity: 0;
  transition: opacity 0.4s var(--ease);
  z-index: 2;
}

.product-card:hover {
  border-color: rgba(37, 99, 235, 0.2);
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.product-card:hover::before {
  opacity: 1;
}

/* Card glow effect on hover */
.product-card::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at center, rgba(37, 99, 235, 0.04), transparent 60%);
  opacity: 0;
  transition: opacity 0.4s var(--ease);
  pointer-events: none;
  z-index: 1;
}

.product-card:hover::after {
  opacity: 1;
}

.product-card-img {
  width: 100%;
  height: 220px;
  background: var(--bg-medium);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

.product-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s var(--ease);
}

.product-card:hover .product-card-img img {
  transform: scale(1.06);
}

.product-card-img .placeholder-icon {
  font-size: 3rem;
  opacity: 0.3;
}

.product-card-body {
  padding: 20px;
  position: relative;
  z-index: 2;
}

.product-card-body h3 {
  margin-bottom: 8px;
  font-size: 1.15rem;
}

.product-card-body p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.product-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}

.product-tag {
  padding: 3px 10px;
  font-size: 0.75rem;
  font-weight: 500;
  background: rgba(37, 99, 235, 0.06);
  border: 1px solid rgba(37, 99, 235, 0.1);
  border-radius: 100px;
  color: var(--accent);
}

.product-card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  transition: gap var(--duration) var(--ease);
}

.product-card-link:hover {
  gap: 10px;
  color: var(--accent-dark);
}

/* ================================
   9. Advantages / Features
   ================================ */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.advantage-item {
  padding: 28px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all 0.4s var(--ease);
  box-shadow: var(--shadow-sm);
}

.advantage-item:hover {
  border-color: rgba(37, 99, 235, 0.15);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.advantage-icon {
  width: 48px;
  height: 48px;
  background: rgba(37, 99, 235, 0.08);
  border: 1px solid rgba(37, 99, 235, 0.12);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  font-size: 1.3rem;
}

.advantage-item h4 {
  margin-bottom: 8px;
  color: var(--text-primary);
}

.advantage-item p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* ================================
   10. About / Company Section
   ================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.about-text h2 {
  margin-bottom: 16px;
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 16px;
  font-size: 1rem;
}

.about-visual {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 4/3;
  background: var(--bg-medium);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-md);
}

.about-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about-visual .steel-badge {
  position: absolute;
  bottom: 16px;
  right: 16px;
  padding: 12px 20px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(37, 99, 235, 0.15);
  border-radius: var(--radius);
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--accent);
  font-size: 0.9rem;
  box-shadow: var(--shadow-sm);
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 32px;
}

.stat-box {
  text-align: center;
  padding: 20px 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.stat-box .number {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent);
}

.stat-box .unit {
  font-size: 0.9rem;
  color: var(--highlight);
}

.stat-box .label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ================================
   11. CTA Section
   ================================ */
.cta-section {
  position: relative;
  padding: 80px 0;
  background: linear-gradient(135deg, #EFF6FF 0%, #F0FDFA 50%, #EFF6FF 100%);
  border-top: 1px solid rgba(37, 99, 235, 0.1);
  border-bottom: 1px solid rgba(37, 99, 235, 0.1);
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(37,99,235,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37,99,235,0.02) 1px, transparent 1px);
  background-size: 40px 40px;
}

.cta-inner {
  position: relative;
  text-align: center;
}

.cta-inner h2 {
  margin-bottom: 12px;
}

.cta-inner p {
  color: var(--text-secondary);
  margin-bottom: 32px;
  font-size: 1.1rem;
}

.cta-phone {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 24px;
}

.cta-phone a {
  color: var(--accent);
}

.cta-phone a:hover {
  color: var(--accent-dark);
}

/* ================================
   12. News Cards
   ================================ */
.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.news-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.4s var(--ease);
  box-shadow: var(--shadow-sm);
}

.news-card:hover {
  border-color: rgba(37, 99, 235, 0.15);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.news-card-img {
  width: 100%;
  height: 180px;
  background: var(--bg-medium);
  overflow: hidden;
}

.news-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.news-card-body {
  padding: 20px;
}

.news-date {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  font-family: var(--font-display);
}

.news-card-body h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.news-card-body p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ================================
   13. Contact Section & Form
   ================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.contact-info-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-top: 24px;
}

.contact-info-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.contact-info-item .icon {
  width: 44px;
  height: 44px;
  background: rgba(37, 99, 235, 0.08);
  border: 1px solid rgba(37, 99, 235, 0.12);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.contact-info-item h4 {
  font-size: 0.95rem;
  margin-bottom: 4px;
}

.contact-info-item p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.95rem;
  transition: border-color var(--duration) var(--ease);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-group textarea {
  min-height: 120px;
  resize: vertical;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* ================================
   14. Footer
   ================================ */
.footer {
  background: var(--bg-dark);
  border-top: 1px solid var(--border);
  padding: 60px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  padding-bottom: 40px;
}

.footer-brand h3 {
  font-size: 1.2rem;
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.footer h4 {
  font-size: 0.95rem;
  margin-bottom: 16px;
  color: var(--accent);
}

.footer-links a {
  display: block;
  font-size: 0.9rem;
  color: var(--text-secondary);
  padding: 4px 0;
}

.footer-links a:hover {
  color: var(--accent);
}

.footer-contact p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-bottom p {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ================================
   15. Product Detail Page
   ================================ */
.page-header {
  padding: 140px 0 60px;
  background: linear-gradient(135deg, #F0F5FF 0%, #FFFFFF 100%);
  border-bottom: 1px solid var(--border);
}

.page-header h1 {
  margin-bottom: 12px;
}

.page-header p {
  color: var(--text-secondary);
  font-size: 1.05rem;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.breadcrumb a {
  color: var(--text-muted);
}

.breadcrumb a:hover {
  color: var(--accent);
}

.breadcrumb .sep { color: var(--steel-light); }

.product-detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  margin-bottom: 60px;
}

.product-gallery {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg-card);
  box-shadow: var(--shadow-sm);
}

.product-gallery .main-image {
  width: 100%;
  aspect-ratio: 1;
  background: var(--bg-medium);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.product-gallery .main-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s var(--ease);
  cursor: zoom-in;
}

.product-gallery .main-image img:hover {
  transform: scale(1.03);
}

.thumbnail-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
  padding: 4px;
  background: var(--bg-medium);
}

.thumbnail-grid .thumb {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  cursor: pointer;
  opacity: 0.7;
  transition: all 0.2s var(--ease);
  border-radius: 2px;
}

.thumbnail-grid .thumb:hover,
.thumbnail-grid .thumb.active {
  opacity: 1;
  box-shadow: 0 0 0 2px var(--accent);
}

.product-info h2 {
  margin-bottom: 16px;
}

.product-info .desc {
  color: var(--text-secondary);
  margin-bottom: 24px;
  line-height: 1.8;
}

.feature-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.feature-list li .check {
  color: var(--accent);
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 2px;
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 28px;
}

.spec-table th,
.spec-table td {
  padding: 10px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}

.spec-table th {
  background: var(--bg-medium);
  color: var(--accent);
  font-family: var(--font-display);
  font-weight: 600;
  width: 140px;
}

.spec-table td {
  color: var(--text-secondary);
}

/* ================================
   16. Animations
   ================================ */
@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

@keyframes fade-in-up {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.animate-fade-in-up {
  opacity: 0;
  animation: fade-in-up 0.7s var(--ease) forwards;
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered reveal for grid children */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

.reveal-stagger.visible > * {
  opacity: 1;
  transform: translateY(0);
}

.reveal-stagger.visible > *:nth-child(1) { transition-delay: 0s; }
.reveal-stagger.visible > *:nth-child(2) { transition-delay: 0.08s; }
.reveal-stagger.visible > *:nth-child(3) { transition-delay: 0.16s; }
.reveal-stagger.visible > *:nth-child(4) { transition-delay: 0.24s; }
.reveal-stagger.visible > *:nth-child(5) { transition-delay: 0.32s; }
.reveal-stagger.visible > *:nth-child(6) { transition-delay: 0.40s; }

/* Glow line animation for section headers */
.glow-line {
  width: 60px;
  height: 3px;
  background: var(--accent-gradient);
  border-radius: 3px;
  margin: 0 auto 1.5rem;
  position: relative;
  overflow: hidden;
}

.glow-line::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.6), transparent);
  animation: shimmer 3s infinite;
}

/* Tech border animation */
.tech-border {
  position: relative;
}

.tech-border::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, var(--accent), var(--highlight), var(--accent));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity 0.4s var(--ease);
}

.tech-border:hover::before {
  opacity: 1;
}

/* ================================
   17. Utility
   ================================ */
.text-center { text-align: center; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }

/* ================================
   18. Responsive
   ================================ */
@media (max-width: 1024px) {
  .about-grid,
  .contact-grid,
  .product-detail-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .stats-row {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --section-py: 60px;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--bg-card);
    flex-direction: column;
    padding: 80px 24px 24px;
    gap: 4px;
    border-left: 1px solid var(--border);
    box-shadow: -4px 0 20px rgba(0,0,0,0.1);
    transition: right var(--duration) var(--ease);
  }

  .nav-links.open {
    right: 0;
  }

  .nav-links a {
    width: 100%;
    padding: 12px 16px;
  }

  .nav-phone {
    margin-top: 12px;
    justify-content: center;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-stats {
    gap: 24px;
    flex-wrap: wrap;
  }

  .hero-stat .number {
    font-size: 1.8rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .products-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.8rem;
  }

  .hero-desc {
    font-size: 1rem;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
    justify-content: center;
  }

  .stats-row {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }

  .cta-phone {
    font-size: 1.5rem;
  }
}

/* ================================
   19. Product Card Link Wrap
   ================================ */
.product-card-link-wrap {
  display: block;
  text-decoration: none;
  color: inherit;
}

.product-card-link-wrap:hover {
  color: inherit;
}

/* ================================
   20. Product Videos
   ================================ */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 24px;
}

.video-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.4s var(--ease);
}

.video-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.video-card video {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  display: block;
  background: #000;
}

.video-card-body {
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.video-card-body .video-icon {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 12px;
}

.video-card-body .video-title {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.4;
}

@media (max-width: 480px) {
  .video-grid {
    grid-template-columns: 1fr;
  }
}