@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* ==========================================
   Design Tokens & CSS Custom Properties
   ========================================== */
:root {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  
  /* Color Palette - Premium Navy & Slate with Light Ice Blue Gradients */
  --color-primary: #0F172A;       /* Deep Slate Navy (Text/Headers) */
  --color-secondary: #475569;     /* Slate Gray (Subtitles/Body) */
  --color-accent: #0284C7;        /* Clean Sky Blue (CTAs/Interactions) */
  --color-accent-hover: #0369A1;  /* Darker Sky Blue */
  --color-accent-light: #E0F2FE;  /* Very Light Ice Blue */
  
  /* Glassmorphism Specification */
  --glass-bg: rgba(255, 255, 255, 0.45);
  --glass-border: rgba(255, 255, 255, 0.7);
  --glass-blur: 25px;
  --glass-shadow: rgba(15, 23, 42, 0.03);
  
  /* Border Radii */
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 8px;
  --radius-pill: 999px;
  
  /* Spacing Scale */
  --space-xxs: 4px;
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 40px;
  --space-xl: 64px;
  --space-xxl: 120px;
  
  /* Transitions */
  --transition-smooth: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: all 0.2s ease-out;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  color: var(--color-secondary);
  background-color: #FFFFFF;
  line-height: 1.6;
  overflow-x: hidden;
  /* Soft Apple-style gradient background */
  background-image: 
    radial-gradient(circle at 80% 20%, rgba(224, 242, 254, 0.25) 0%, rgba(255, 255, 255, 0) 40%),
    radial-gradient(circle at 20% 70%, rgba(224, 242, 254, 0.2) 0%, rgba(255, 255, 255, 0) 50%);
  background-attachment: fixed;
}

h1, h2, h3, h4 {
  color: var(--color-primary);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.25;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-fast);
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  transition: var(--transition-fast);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ==========================================
   Layout Containers & Utilities
   ========================================== */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

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

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto var(--space-xl);
}

.section-header h2 {
  font-size: 2.5rem;
  margin-bottom: var(--space-sm);
  background: linear-gradient(135deg, var(--color-primary) 0%, #334155 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-header p {
  font-size: 1.125rem;
  color: var(--color-secondary);
}

.badge {
  display: inline-block;
  padding: 6px 16px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-accent);
  background-color: var(--color-accent-light);
  border-radius: var(--radius-pill);
  margin-bottom: var(--space-sm);
}

/* ==========================================
   Interactive Glassmorphism Card (GlassCard)
   ========================================== */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 30px var(--glass-shadow);
  padding: var(--space-lg);
  position: relative;
  overflow: hidden;
  transition: var(--transition-smooth);
}

.glass-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(15, 23, 42, 0.06);
  border-color: rgba(255, 255, 255, 0.85);
}

/* Dynamic reflection overlay populated by mouse tracker JS */
.glass-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  background: radial-gradient(
    circle 150px at var(--mouse-x, 0px) var(--mouse-y, 0px),
    rgba(255, 255, 255, 0.15),
    transparent 80%
  );
  opacity: 0;
  transition: opacity 0.3s ease;
}

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

/* ==========================================
   Buttons (Apple Aesthetics)
   ========================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: var(--radius-pill);
  transition: var(--transition-smooth);
  gap: 8px;
}

.btn-primary {
  background-color: var(--color-accent);
  color: #FFFFFF;
}

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  box-shadow: 0 4px 14px var(--color-accent-glow);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: rgba(15, 23, 42, 0.05);
  color: var(--color-primary);
  border: 1px solid rgba(15, 23, 42, 0.05);
}

.btn-secondary:hover {
  background-color: rgba(15, 23, 42, 0.08);
  transform: translateY(-1px);
}

.btn-text {
  color: var(--color-accent);
  font-weight: 500;
  padding: 8px 0;
  gap: 4px;
}

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

.btn-text svg {
  transition: transform 0.2s ease;
}

.btn-text:hover svg {
  transform: translateX(4px);
}

/* ==========================================
   Navigation Header
   ========================================== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(15, 23, 42, 0.06);
  height: 72px;
  display: flex;
  align-items: center;
  transition: var(--transition-fast);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.logo {
  display: flex;
  align-items: center;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  gap: 8px;
}

.logo-icon {
  width: 30px;
  height: 30px;
  display: block;
  object-fit: contain;
  border-radius: 8px;
  flex-shrink: 0;
}

.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 32px;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-secondary);
}

.nav-link:hover, .nav-link.active {
  color: var(--color-accent);
}

.menu-toggle {
  display: none;
}

/* ==========================================
   Hero Section
   ========================================== */
.hero {
  padding: calc(var(--space-xxl) + 24px) 0 var(--space-xxl) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translate(-50%, 0);
  width: 1000px;
  height: 1000px;
  background: radial-gradient(circle, rgba(14, 165, 233, 0.08) 0%, rgba(255, 255, 255, 0) 70%);
  pointer-events: none;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.025em;
  margin-bottom: var(--space-sm);
  background: linear-gradient(135deg, var(--color-primary) 30%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p.lead {
  font-size: 1.25rem;
  color: var(--color-secondary);
  margin-bottom: var(--space-lg);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-ctas {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
}

.hero-showcase {
  position: relative;
  max-width: 960px;
  margin: 0 auto;
  border-radius: var(--radius-lg);
  box-shadow: 0 30px 60px rgba(15, 23, 42, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.8);
  overflow: hidden;
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.hero-img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(1.05);
}

/* ==========================================
   Product Catalog (Interactive Tabs)
   ========================================== */
.product-tabs {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: var(--space-xl);
}

.tab-btn {
  padding: 10px 24px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-secondary);
  border-radius: var(--radius-pill);
  border: 1px solid rgba(15, 23, 42, 0.08);
  background: var(--glass-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: var(--transition-smooth);
}

.tab-btn:hover {
  background: rgba(255, 255, 255, 0.85);
  border-color: rgba(15, 23, 42, 0.15);
}

.tab-btn.active {
  color: #FFFFFF;
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.1);
}

.product-display {
  position: relative;
}

.product-pane {
  display: none;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--space-xl);
  align-items: center;
  animation: fadeIn 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.product-pane.active {
  display: grid;
}

.product-visual {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(15, 23, 42, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.7);
  background: var(--glass-bg);
  position: relative;
}

.product-visual img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  transition: transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.product-visual:hover img {
  transform: scale(1.03);
}

.product-info h3 {
  font-size: 2.25rem;
  margin-bottom: var(--space-sm);
}

.product-desc {
  font-size: 1.05rem;
  margin-bottom: var(--space-lg);
  color: var(--color-secondary);
}

.feature-list {
  list-style: none;
  margin-bottom: var(--space-lg);
}

.feature-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.95rem;
  margin-bottom: var(--space-sm);
  color: var(--color-secondary);
}

.feature-item svg {
  width: 20px;
  height: 20px;
  stroke: var(--color-accent);
  stroke-width: 2.5;
  fill: none;
  flex-shrink: 0;
  margin-top: 2px;
}

/* ==========================================
   Factory & Quality Control Strength
   ========================================== */
.factory-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
  align-items: center;
}

.factory-visual {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(15, 23, 42, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.8);
}

.factory-visual img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.factory-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.stat-card {
  padding: var(--space-md);
  text-align: left;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1.1;
  margin-bottom: 6px;
}

.stat-label {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.stat-desc {
  font-size: 0.85rem;
  color: var(--color-secondary);
}

/* ==========================================
   OEM/ODM Customization Panel
   ========================================== */
.custom-wrapper {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.custom-card {
  text-align: center;
  padding: var(--space-lg) var(--space-md);
}

.custom-icon {
  width: 56px;
  height: 56px;
  stroke: var(--color-accent);
  stroke-width: 1.5;
  fill: none;
  background-color: var(--color-accent-light);
  border-radius: var(--radius-md);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
}

.custom-card h3 {
  font-size: 1.25rem;
  margin-bottom: var(--space-xs);
}

.custom-card p {
  font-size: 0.9rem;
}

/* ==========================================
   Inquiry Contact Section
   ========================================== */
.inquiry-wrapper {
  max-width: 900px;
  margin: 0 auto;
}

.inquiry-contact-card {
  text-align: left;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
  align-items: center;
}

.contact-primary {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-sm);
}

.contact-primary h3 {
  font-size: 2rem;
}

.contact-intro {
  font-size: 1rem;
  color: var(--color-secondary);
  max-width: 480px;
}

.contact-email-link {
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--color-primary);
  letter-spacing: -0.02em;
  word-break: break-word;
}

.contact-email-link:hover {
  color: var(--color-accent);
}

.contact-cta-row {
  display: flex;
  justify-content: flex-start;
  margin-top: var(--space-xs);
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  padding: 20px 22px;
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.04);
}

.contact-icon {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  background: rgba(224, 242, 254, 0.65);
  color: var(--color-accent);
}

.contact-icon svg {
  width: 22px;
  height: 22px;
  stroke: currentColor;
  stroke-width: 1.8;
  fill: none;
}

.contact-item h4 {
  font-size: 0.95rem;
  margin-bottom: 6px;
}

.contact-item p {
  color: var(--color-secondary);
  font-size: 0.92rem;
}

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

/* ==========================================
   Footer
   ========================================== */
.footer {
  background-color: #F8FAFC;
  border-top: 1px solid rgba(15, 23, 42, 0.05);
  padding: var(--space-xl) 0 var(--space-md) 0;
  font-size: 0.9rem;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.2fr repeat(3, 0.6fr);
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-brand p {
  color: var(--color-secondary);
  font-size: 0.9rem;
  max-width: 240px;
}

.footer-column h4 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 12px;
}

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

.footer-bottom {
  border-top: 1px solid rgba(15, 23, 42, 0.05);
  padding-top: var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #94A3B8;
  font-size: 0.8rem;
}

.footer-certs {
  display: flex;
  align-items: center;
  gap: 20px;
}

.cert-badge {
  font-weight: 700;
  font-size: 0.85rem;
  color: #64748B;
  border: 1.5px solid #CBD5E1;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

/* ==========================================
   Core Scroll Animations & Fade-In Elements
   ========================================== */
.fade-in-up {
  opacity: 0;
  transform: translateY(32px);
  transition: 
    opacity 1.2s cubic-bezier(0.16, 1, 0.3, 1),
    transform 1.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ==========================================
   Responsive Adaptations & Media Queries
   ========================================== */

/* Tablet Layout (1024px and down) */
@media (max-width: 1024px) {
  .section {
    padding: var(--space-xl) 0;
  }
  
  .product-pane {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
  
  .product-visual img {
    aspect-ratio: 16 / 10;
  }
  
  .factory-grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
  
  .factory-visual img {
    aspect-ratio: 16 / 10;
  }
  
  .custom-wrapper {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-top {
    grid-template-columns: 1.5fr 1fr;
    gap: var(--space-lg);
  }
}

/* Mobile Layout (768px and down) */
@media (max-width: 768px) {
  .section-header h2 {
    font-size: 2rem;
  }
  
  .hero {
    padding-top: calc(var(--space-xl) + 24px);
  }
  
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .hero p.lead {
    font-size: 1.1rem;
  }
  
  .hero-ctas {
    flex-direction: column;
    width: 100%;
    max-width: 320px;
    margin: 0 auto var(--space-xl) auto;
  }
  
  .hero-ctas .btn {
    width: 100%;
  }
  
  .nav-menu {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(25px);
    -webkit-backdrop-filter: blur(25px);
    flex-direction: column;
    padding: var(--space-lg) var(--space-md);
    border-bottom: 1px solid rgba(15, 23, 42, 0.08);
    gap: var(--space-md);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: var(--transition-smooth);
  }
  
  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  
  .menu-toggle {
    display: block;
    width: 32px;
    height: 32px;
    position: relative;
  }
  
  .menu-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    background-color: var(--color-primary);
    position: absolute;
    left: 6px;
    transition: var(--transition-fast);
  }
  
  .menu-toggle span:first-child { top: 11px; }
  .menu-toggle span:last-child { bottom: 11px; }
  
  .menu-toggle.open span:first-child {
    transform: translateY(4px) rotate(45deg);
  }
  
  .menu-toggle.open span:last-child {
    transform: translateY(-4px) rotate(-45deg);
  }
  
  .product-tabs {
    flex-wrap: wrap;
    gap: 8px;
  }
  
  .tab-btn {
    padding: 8px 18px;
    font-size: 0.85rem;
  }
  
  .custom-wrapper {
    grid-template-columns: 1fr;
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .contact-primary h3 {
    font-size: 1.65rem;
  }
  
  .footer-top {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}