@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@300;400;500;600;700;800;900&display=swap');

/* ==========================================================================
   CSS Variables & Design Tokens — RNA Tubes Combined Theme
   Corporate Navy + Precision Steel
   ========================================================================== */
:root {
  /* Primary Color Palette */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-dark: #143864;
  --bg-dark-hover: #0e2a4e;
  --bg-card: #ffffff;

  --border-color: #cbd5e1;
  --border-color-dark: rgba(255,255,255,0.12);

  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;

  --color-primary: #143864;
  --color-primary-hover: #0e2a4e;
  --color-primary-glow: rgba(20, 56, 100, 0.12);

  --color-accent: #1e40af;       /* Precision deep blue */
  --color-accent-hover: #1d4ed8;
  --color-accent-glow: rgba(30, 64, 175, 0.15);

  --color-success: #16a34a;
  --color-amber: #ea580c;

  --font-body: 'Inter', 'Outfit', sans-serif;
  --font-display: 'Outfit', sans-serif;

  --transition-speed: 0.3s;
  --transition-ease: cubic-bezier(0.4, 0, 0.2, 1);
  --border-radius: 8px;
  --border-radius-sm: 5px;
  --box-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --box-shadow-md: 0 4px 16px rgba(15, 23, 42, 0.07);
  --box-shadow-lg: 0 10px 30px rgba(15, 23, 42, 0.10);
  --box-shadow-xl: 0 20px 50px rgba(15, 23, 42, 0.12);
}

/* ==========================================================================
   Tabbed Product Specification Section
   ========================================================================== */
.products-spec-section {
  padding: 110px 0;
  background-color: #f8fafc;
}

/* Section header line-under-title */
.spec-section-title {
  font-size: 2.4rem;
  color: var(--text-primary);
  font-weight: 800;
  margin: 10px 0 14px;
  font-family: var(--font-display);
}

.header-line-center {
  width: 70px;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
  border-radius: 2px;
  margin: 0 auto;
}

/* Tab Buttons Bar */
.product-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 44px 0 30px;
  justify-content: center;
}

.tab-btn {
  padding: 10px 22px;
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 700;
  border: 2px solid var(--border-color);
  border-radius: 50px;
  background: #ffffff;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-speed) var(--transition-ease);
  white-space: nowrap;
}

.tab-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(20, 56, 100, 0.04);
}

.tab-btn.active {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #ffffff;
  box-shadow: 0 4px 16px rgba(30, 64, 175, 0.25);
}

/* Tab Content Container */
.tab-content-container {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow-md);
  overflow: hidden;
}

.tab-content {
  display: none;
  padding: 0;
  animation: tabFadeIn 0.35s ease;
}

.tab-content.active {
  display: block;
}

@keyframes tabFadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Two-column detail grid inside tab */
.product-detail-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  min-height: 380px;
}

/* Image box */
.product-img-box {
  overflow: hidden;
  position: relative;
  background: #0f172a;
}

.product-img-box img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.88;
  display: block;
  transition: transform 0.5s ease, opacity 0.4s ease;
}

.product-img-box:hover img {
  transform: scale(1.04);
  opacity: 1;
}

/* Specs box */
.product-specs-box {
  padding: 40px 44px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.product-specs-box h3 {
  font-size: 1.55rem;
  color: var(--color-primary);
  font-weight: 800;
  margin-bottom: 10px;
  font-family: var(--font-display);
}

.product-specs-box .lead-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 24px;
}

/* Spec Table */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.spec-table tr {
  border-bottom: 1px solid #f1f5f9;
  transition: background 0.2s;
}

.spec-table tr:last-child {
  border-bottom: none;
}

.spec-table tr:hover {
  background: #f8fafc;
}

.spec-table th {
  padding: 11px 14px;
  text-align: left;
  font-weight: 700;
  color: var(--color-primary);
  background: #f8fafc;
  white-space: nowrap;
  width: 38%;
  border-right: 2px solid var(--color-accent);
}

.spec-table td {
  padding: 11px 14px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.btn-sm {
  padding: 0.6rem 1.3rem;
  font-size: 0.85rem;
}

/* Responsive for tab section */
@media (max-width: 900px) {
  .product-detail-grid {
    grid-template-columns: 1fr;
  }
  .product-img-box {
    height: 240px;
  }
  .product-specs-box {
    padding: 28px 22px;
  }
}

@media (max-width: 600px) {
  .product-tabs {
    gap: 8px;
  }
  .tab-btn {
    padding: 8px 14px;
    font-size: 0.8rem;
  }
  .spec-section-title {
    font-size: 1.8rem;
  }
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  overflow-x: hidden;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-secondary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Custom Scrollbar */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 5px; }
::-webkit-scrollbar-thumb:hover { background: var(--color-primary); }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.25;
}

p { margin-bottom: 1rem; }

a {
  color: inherit;
  text-decoration: none;
  transition: all var(--transition-speed) var(--transition-ease);
}

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

/* Layout Container */
.container {
  width: 100%;
  max-width: 1260px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* ==========================================================================
   Scroll Animations
   ========================================================================== */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.animate-on-scroll.slide-in-left {
  transform: translateX(-40px);
}
.animate-on-scroll.slide-in-right {
  transform: translateX(40px);
}
.animate-on-scroll.visible {
  opacity: 1;
  transform: translate(0);
}
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }

/* ==========================================================================
   Top Header Bar
   ========================================================================== */
.top-bar {
  background-color: var(--color-primary);
  color: #ffffff;
  font-size: 0.82rem;
  padding: 7px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  position: relative;
  z-index: 1001;
}

.top-bar-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.top-bar-info {
  display: flex;
  gap: 22px;
  align-items: center;
}

.top-bar-info p {
  margin-bottom: 0;
  display: flex;
  align-items: center;
  gap: 6px;
  color: #e2e8f0;
}

.top-bar-info a:hover { color: #93c5fd; }

.top-bar-links {
  display: flex;
  gap: 14px;
  align-items: center;
}

.top-bar-links a { color: #cbd5e1; font-weight: 500; }
.top-bar-links a:hover { color: #93c5fd; }
.top-bar-links span { color: rgba(255,255,255,0.25); }

/* ==========================================================================
   Main Navigation Header
   ========================================================================== */
.header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(15, 23, 42, 0.08);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.03);
  transition: all var(--transition-speed) var(--transition-ease);
}

.header.scrolled {
  background: rgba(255, 255, 255, 0.99);
  box-shadow: var(--box-shadow-md);
  border-bottom-color: rgba(20, 56, 100, 0.12);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 88px;
  transition: height 0.3s var(--transition-ease);
  gap: 1rem;
}

.header.scrolled .nav-container { height: 70px; }

.logo-link { display: flex; align-items: center; flex-shrink: 0; }

.logo-svg-nav {
  height: 50px;
  width: auto;
  transition: height 0.3s var(--transition-ease);
}
.header.scrolled .logo-svg-nav { height: 40px; }

/* Nav List */
.nav-menu {
  display: flex;
  list-style: none;
  height: 100%;
  flex: 1;
  justify-content: center;
}

.nav-item {
  position: relative;
  display: flex;
  align-items: center;
  height: 100%;
}

.nav-link {
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--color-primary);
  padding: 0 14px;
  height: 100%;
  display: flex;
  align-items: center;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 14px;
  right: 14px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.3s var(--transition-ease);
}
.nav-link:hover,
.nav-link.active { color: var(--color-accent); }
.nav-link:hover::after,
.nav-link.active::after { transform: scaleX(1); }

/* Dropdown */
.dropdown-menu {
  display: none;
  position: absolute;
  top: 88px;
  left: 0;
  background: #ffffff;
  border: 1px solid var(--border-color);
  box-shadow: var(--box-shadow-lg);
  list-style: none;
  min-width: 280px;
  z-index: 1100;
  border-top: 3px solid var(--color-primary);
  border-radius: 0 0 var(--border-radius-sm) var(--border-radius-sm);
}
.header.scrolled .dropdown-menu { top: 70px; }
.dropdown-menu li { width: 100%; }
.dropdown-menu a {
  display: block;
  padding: 11px 20px;
  font-size: 0.83rem;
  font-weight: 600;
  color: var(--text-secondary);
  border-bottom: 1px solid #f1f5f9;
  transition: all 0.2s;
}
.dropdown-menu a:hover {
  background-color: var(--bg-secondary);
  color: var(--color-primary);
  padding-left: 26px;
}
.nav-item:hover .dropdown-menu { display: block; }

/* Nav CTA */
.nav-cta { display: flex; align-items: center; flex-shrink: 0; }
.nav-cta-btn {
  padding: 10px 22px;
  font-size: 0.82rem;
  background: var(--color-primary);
}

/* Mobile */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* ==========================================================================
   Hero Banner Carousel Slider
   ========================================================================== */
.hero-slider {
  height: 620px;
  width: 100%;
  position: relative;
  overflow: hidden;
  background-color: #0f172a;
}

.slide {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  opacity: 0;
  transition: opacity 0.9s ease-in-out;
  display: flex;
  align-items: center;
  z-index: 1;
}
.slide.active { opacity: 1; z-index: 2; }

.slide-bg {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background-size: cover;
  background-position: center;
  z-index: 1;
  transform: scale(1.05);
  transition: transform 6s ease;
}
.slide.active .slide-bg { transform: scale(1); }

.slide::after {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: linear-gradient(100deg, rgba(14, 42, 78, 0.9) 0%, rgba(20, 56, 100, 0.65) 55%, rgba(0,0,0,0.35) 100%);
  z-index: 2;
}

.slide-content {
  position: relative;
  z-index: 3;
  color: #ffffff;
  max-width: 780px;
  padding: 0;
}

.slide-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  text-transform: uppercase;
  color: #93c5fd;
  font-weight: 700;
  letter-spacing: 0.15em;
  margin-bottom: 20px;
  background: rgba(255,255,255,0.08);
  padding: 6px 16px;
  border-radius: 50px;
  border: 1px solid rgba(255,255,255,0.15);
  backdrop-filter: blur(4px);
}

.slide-title {
  color: #ffffff;
  font-size: 3.6rem;
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.slide-desc {
  font-size: 1.1rem;
  margin-bottom: 32px;
  opacity: 0.88;
  line-height: 1.75;
  max-width: 640px;
}

.slider-btn-container {
  display: flex;
  gap: 14px;
  margin-bottom: 36px;
}

/* Slide stats row */
.slide-stats {
  display: flex;
  gap: 30px;
  flex-wrap: wrap;
}
.slide-stat {
  display: flex;
  flex-direction: column;
}
.slide-stat-num {
  font-size: 1.8rem;
  font-weight: 800;
  color: #ffffff;
  line-height: 1;
}
.slide-stat-lbl {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #93c5fd;
  margin-top: 4px;
}

/* Spec pill tags */
.slide-spec-tags {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.spec-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.2);
  color: #f1f5f9;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 50px;
  backdrop-filter: blur(4px);
}
.spec-pill i { color: #93c5fd; }

/* Slider Controls */
.slider-control {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 50px; height: 50px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 10;
  transition: all var(--transition-speed);
  backdrop-filter: blur(4px);
}
.slider-control:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  transform: translateY(-50%) scale(1.05);
}
.slider-prev { left: 24px; }
.slider-next { right: 24px; }

.slider-indicators {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 10;
}
.slider-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.4);
  cursor: pointer;
  transition: all var(--transition-speed);
}
.slider-dot.active {
  background: #ffffff;
  transform: scale(1.3);
}

/* ==========================================================================
   Statistics Bar
   ========================================================================== */
.stats-section {
  background: linear-gradient(135deg, var(--color-primary) 0%, #0c274c 100%);
  color: #ffffff;
  padding: 60px 0;
  border-top: 4px solid var(--color-accent);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  text-align: center;
}

.stat-card h3 {
  font-size: 3rem;
  font-weight: 900;
  color: #93c5fd;
  margin-bottom: 6px;
}
.stat-card p {
  font-size: 0.85rem;
  text-transform: uppercase;
  font-weight: 700;
  color: #f1f5f9;
  letter-spacing: 0.06em;
  margin-bottom: 0;
}

/* ==========================================================================
   Section Framework
   ========================================================================== */
.section {
  padding: 110px 0;
  position: relative;
  scroll-margin-top: 90px;
}
.section-dark { background-color: var(--bg-secondary); }

.section-title-wrapper {
  text-align: center;
  margin-bottom: 70px;
}

.section-label {
  display: inline-block;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  font-weight: 700;
  margin-bottom: 8px;
}

.section-title {
  font-size: 2.4rem;
  color: var(--color-primary);
  margin-bottom: 16px;
  position: relative;
  display: inline-block;
  padding-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}
.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 70px; height: 4px;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
  border-radius: 2px;
}
.section-subtitle-text {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0.82rem 1.8rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.9rem;
  border-radius: var(--border-radius-sm);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-speed) var(--transition-ease);
  white-space: nowrap;
}
.btn-primary {
  background-color: var(--color-accent);
  color: #ffffff;
  border-color: var(--color-accent);
}
.btn-primary:hover {
  background-color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(30, 64, 175, 0.3);
}
.btn-secondary {
  background-color: transparent;
  border-color: rgba(255,255,255,0.7);
  color: #ffffff;
}
.btn-secondary:hover {
  background-color: #ffffff;
  color: var(--color-primary);
  transform: translateY(-2px);
}
.btn-navy {
  background-color: var(--color-primary);
  color: #ffffff;
  border-color: var(--color-primary);
}
.btn-navy:hover {
  background-color: var(--color-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(20, 56, 100, 0.3);
}

/* ==========================================================================
   About Us Section
   ========================================================================== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 80px;
  align-items: center;
}

.about-img-container {
  position: relative;
  border: 6px solid #ffffff;
  box-shadow: var(--box-shadow-lg);
  border-radius: var(--border-radius-sm);
  overflow: visible;
  height: 500px;
}

.about-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--border-radius-sm);
  display: block;
}

.about-badge {
  position: absolute;
  bottom: -20px;
  right: -20px;
  background: var(--color-primary);
  color: #ffffff;
  padding: 20px 24px;
  border-radius: var(--border-radius);
  text-align: center;
  box-shadow: var(--box-shadow-lg);
  z-index: 3;
}
.about-badge h4 {
  font-size: 2.2rem;
  font-weight: 900;
  color: #93c5fd;
  line-height: 1;
}
.about-badge p {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #cbd5e1;
  margin: 4px 0 0;
}

.about-heading {
  font-size: 2.2rem;
  color: var(--color-primary);
  margin-bottom: 24px;
  text-transform: uppercase;
  letter-spacing: -0.01em;
}
.about-heading span { color: var(--color-accent); }

.about-text p {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 18px;
  text-align: justify;
  line-height: 1.85;
}

/* Key Pillars */
.key-pillars {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 28px;
  padding: 24px;
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
}
.pillar {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.pillar-icon {
  width: 46px; height: 46px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  color: #ffffff;
  border-radius: var(--border-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.pillar-info h4 {
  font-size: 1rem;
  color: var(--color-primary);
  margin-bottom: 3px;
}
.pillar-info p {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin: 0;
}

/* ==========================================================================
   Vision / Mission Cards
   ========================================================================== */
.vision-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.glass-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 36px 28px;
  box-shadow: var(--box-shadow-sm);
  transition: all var(--transition-speed) var(--transition-ease);
}
.glass-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--box-shadow-md);
  border-color: var(--color-primary);
}
.glass-card-title {
  font-size: 1.05rem;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.accent-text { color: var(--color-accent) !important; }
.primary-text { color: var(--color-primary) !important; }
.glass-card p {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin: 0;
  font-style: italic;
}

/* ==========================================================================
   Product Cards Grid (8-card layout)
   ========================================================================== */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 32px;
}

.product-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--box-shadow-sm);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
}
.product-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--box-shadow-lg);
  border-color: var(--color-primary);
}
.product-card-img-container {
  height: 210px;
  overflow: hidden;
  position: relative;
}
.product-card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}
.product-card:hover .product-card-img { transform: scale(1.08); }

.product-card-content {
  padding: 22px 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.product-card h4 {
  font-size: 1.15rem;
  color: var(--color-primary);
  margin-bottom: 10px;
}
.product-card p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 20px;
  flex: 1;
}
.product-card-btn {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-accent);
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin-top: auto;
  transition: gap 0.2s;
}
.product-card:hover .product-card-btn {
  color: var(--color-primary);
  gap: 10px;
}

/* ==========================================================================
   Manufacturing Process Timeline
   ========================================================================== */
.process-container {
  max-width: 1000px;
  margin: 0 auto;
  position: relative;
}

/* Single continuous vertical line behind all circles */
.process-container::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 26px;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-primary), var(--color-accent));
  opacity: 0.25;
  z-index: 0;
}

.process-step {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 24px;
  margin-bottom: 44px;
  position: relative;
  align-items: center;
  z-index: 1;
}

/* Remove individual step connector lines — handled by container ::before */

.process-step-num {
  width: 52px; height: 52px;
  border-radius: 50%;
  background: var(--bg-secondary);   /* solid bg to cover the vertical line */
  border: 3px solid var(--color-primary);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  font-weight: 900;
  font-family: var(--font-display);
  box-shadow: 0 0 0 4px var(--bg-secondary); /* halo to cleanly mask the line */
  position: relative;
  z-index: 2;
  flex-shrink: 0;
  transition: all var(--transition-speed);
  margin: 0 auto;
}
.process-step:hover .process-step-num {
  background: var(--color-primary);
  color: #ffffff;
  transform: scale(1.1);
}
.process-step:nth-child(even) .process-step-num {
  border-color: var(--color-accent);
  color: var(--color-accent);
}
.process-step:nth-child(even):hover .process-step-num {
  background: var(--color-accent);
  color: #ffffff;
}

.process-step-card {
  background: #ffffff;
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: var(--border-radius);
  padding: 28px 32px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
  display: grid;
  grid-template-columns: 1fr 240px;
  gap: 28px;
  align-items: center;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.process-step-card:hover {
  transform: translateX(12px);
  box-shadow: 0 15px 35px rgba(20, 56, 100, 0.08);
  border-color: rgba(20, 56, 100, 0.15);
}
.process-step-info h4 {
  font-size: 1.25rem;
  color: var(--color-primary);
  margin-bottom: 10px;
}
.process-step-info p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin: 0;
}
.process-step-img {
  width: 100%;
  height: 150px;
  object-fit: cover;
  border-radius: var(--border-radius-sm);
  border: 1px solid rgba(15, 23, 42, 0.08);
  transition: transform 0.5s ease;
}
.process-step-card:hover .process-step-img { transform: scale(1.04); }

/* ==========================================================================
   Quality Assurance Section
   ========================================================================== */
.quality-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}

.quality-list { list-style: none; }
.quality-item {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
  padding: 18px;
  background: var(--bg-secondary);
  border-radius: var(--border-radius-sm);
  border: 1px solid var(--border-color);
  transition: all var(--transition-speed);
}
.quality-item:hover {
  border-color: var(--color-primary);
  box-shadow: var(--box-shadow-sm);
}
.quality-icon {
  font-size: 1.5rem;
  color: var(--color-accent);
  margin-top: 3px;
  flex-shrink: 0;
}
.quality-item h4 {
  font-size: 1rem;
  color: var(--color-primary);
  margin-bottom: 4px;
}
.quality-item p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin: 0;
}

/* Cert grid */
.cert-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 24px;
}

.cert-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  padding: 24px 18px;
  text-align: center;
  border-radius: var(--border-radius-sm);
  box-shadow: var(--box-shadow-sm);
  transition: all var(--transition-speed) var(--transition-ease);
}
.cert-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--box-shadow-md);
  border-color: var(--color-primary);
}
.cert-icon {
  font-size: 2.2rem;
  color: var(--color-primary);
  margin-bottom: 14px;
}
.cert-card h4 {
  font-size: 0.92rem;
  margin-bottom: 8px;
  color: var(--color-primary);
}
.cert-card p {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin: 0;
  line-height: 1.5;
}

.quality-visual { }
.quality-img-wrapper {
  border-radius: var(--border-radius-sm);
  overflow: hidden;
  border: 1px solid var(--border-color);
  box-shadow: var(--box-shadow-sm);
}
.quality-section-img {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

/* ==========================================================================
   Why Choose Us & Brochure
   ========================================================================== */
.why-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
}
.why-list-wrapper ul { list-style: none; }
.why-list-wrapper li {
  position: relative;
  padding-left: 32px;
  margin-bottom: 18px;
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.6;
}
.why-list-wrapper li::before {
  content: '\f058';
  font-family: 'Font Awesome 6 Free';
  font-weight: 900;
  position: absolute;
  left: 0;
  top: 2px;
  color: var(--color-success);
  font-size: 1.1rem;
}

.brochure-card {
  background: #ffffff;
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: var(--border-radius);
  padding: 40px 32px;
  text-align: center;
  box-shadow: var(--box-shadow-md);
  transition: all var(--transition-speed) var(--transition-ease);
  border-top: 4px solid var(--color-accent);
}
.brochure-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--box-shadow-xl);
}
.brochure-icon {
  font-size: 3.5rem;
  color: var(--color-primary);
  margin-bottom: 16px;
}
.brochure-card h4 {
  font-size: 1.3rem;
  color: var(--color-primary);
  margin-bottom: 12px;
}
.brochure-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}

/* ==========================================================================
   Global Network Map
   ========================================================================== */
.network-container {
  max-width: 920px;
  margin: 0 auto;
  text-align: center;
}
.network-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 36px;
  line-height: 1.75;
}
.network-map-wrapper {
  border: 1px solid rgba(15, 23, 42, 0.08);
  padding: 24px;
  background: #ffffff;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow-md);
  transition: box-shadow var(--transition-speed);
}
.network-map-wrapper:hover { box-shadow: var(--box-shadow-lg); }
.network-map { width: 100%; height: auto; display: block; }

/* ==========================================================================
   Visualizer & Calculator
   ========================================================================== */
.visualizer-card {
  background: #ffffff;
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: var(--border-radius);
  padding: 40px;
  box-shadow: var(--box-shadow-md);
}

.visualizer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
}

.visualizer-display {
  background: radial-gradient(circle at center, #ffffff 0%, #f1f5f9 100%);
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: var(--border-radius);
  padding: 24px;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 280px;
}

.visualizer-controls { padding: 10px 0; }

.control-group { margin-bottom: 22px; }
.control-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.88rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-primary);
}
.control-value {
  color: var(--color-accent);
  font-weight: 700;
}

.slider-input {
  width: 100%;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  background: #cbd5e1;
  border-radius: 3px;
  outline: none;
}
.slider-input::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--color-primary);
  cursor: pointer;
  box-shadow: 0 0 0 3px rgba(20, 56, 100, 0.2);
}
.slider-input::-moz-range-thumb {
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--color-primary);
  cursor: pointer;
}

.form-input {
  width: 100%;
  border: 1px solid var(--border-color);
  padding: 11px 14px;
  font-size: 0.92rem;
  font-family: var(--font-body);
  border-radius: var(--border-radius-sm);
  outline: none;
  color: var(--text-primary);
  background: var(--bg-primary);
  transition: border-color var(--transition-speed);
}
.form-input:focus { border-color: var(--color-accent); }

.weight-readout {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 18px 24px;
  border-radius: var(--border-radius-sm);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  text-align: center;
  margin-bottom: 20px;
}
.weight-stat-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 4px;
}
.weight-stat-val {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-primary);
  font-family: var(--font-display);
}
.weight-stat-val.highlight { color: var(--color-accent); }

/* ==========================================================================
   RFQ & Contact Section
   ========================================================================== */
.rfq-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 60px;
  align-items: flex-start;
}

.contact-info-list { margin-top: 28px; }
.contact-info-item {
  display: flex;
  gap: 18px;
  margin-bottom: 28px;
  padding: 16px;
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-speed);
}
.contact-info-item:hover { background: var(--bg-secondary); }
.contact-info-item i {
  font-size: 1.4rem;
  color: var(--color-accent);
  margin-top: 3px;
  flex-shrink: 0;
}
.contact-info-item h4 {
  font-size: 1rem;
  color: var(--color-primary);
  margin-bottom: 4px;
}
.contact-info-item p,
.contact-info-item a {
  font-size: 0.92rem;
  color: var(--text-secondary);
}
.contact-info-item a:hover { color: var(--color-accent); }

.rfq-form-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  padding: 40px;
  border-radius: var(--border-radius-sm);
  box-shadow: var(--box-shadow-lg);
  border-top: 4px solid var(--color-primary);
}
.rfq-form-card h3 {
  font-size: 1.5rem;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.form-group-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-bottom: 0;
}
.form-group { margin-bottom: 18px; }
.form-label {
  display: block;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 7px;
}
textarea.form-input { min-height: 110px; resize: vertical; }

.success-alert {
  background: #dcfce7;
  border: 1px solid #bbf7d0;
  color: #166534;
  padding: 14px 18px;
  border-radius: var(--border-radius-sm);
  margin-bottom: 20px;
  display: none;
  font-weight: 600;
  gap: 8px;
}

.rfq-items-panel {
  background: var(--bg-secondary);
  border: 1px dashed var(--border-color);
  border-radius: var(--border-radius-sm);
  padding: 16px;
  margin-bottom: 24px;
  display: none;
}
.rfq-items-panel.active { display: block; }
.rfq-items-title {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 10px;
}
.rfq-list { list-style: none; }
.rfq-list-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  padding: 7px 0;
  border-bottom: 1px solid #e2e8f0;
}
.rfq-item-remove {
  background: none;
  border: none;
  color: #dc2626;
  cursor: pointer;
  font-weight: 700;
  font-size: 0.78rem;
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
  background-color: var(--color-primary);
  color: #ffffff;
  padding: 75px 0 20px;
  border-top: 5px solid var(--color-accent);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.8fr 0.8fr 1.1fr;
  gap: 40px;
  margin-bottom: 50px;
}
.footer-logo-svg { height: 50px; width: auto; }
.footer-logo-desc {
  font-size: 0.88rem;
  color: #cbd5e1;
  margin-top: 16px;
  line-height: 1.7;
}
.footer-socials {
  display: flex;
  gap: 10px;
  margin-top: 18px;
}
.social-icon {
  width: 36px; height: 36px;
  border-radius: var(--border-radius-sm);
  background: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  transition: all var(--transition-speed);
}
.social-icon:hover {
  background: var(--color-accent);
  transform: translateY(-3px);
}

.footer-links h4 {
  font-size: 0.9rem;
  color: #ffffff;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 20px;
  position: relative;
  padding-bottom: 10px;
}
.footer-links h4::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 36px; height: 2px;
  background-color: var(--color-accent);
}
.footer-links ul { list-style: none; }
.footer-links li { margin-bottom: 12px; }
.footer-links a {
  color: #cbd5e1;
  font-size: 0.86rem;
  transition: all 0.2s;
}
.footer-links a:hover {
  color: #93c5fd;
  padding-left: 6px;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 22px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  color: #94a3b8;
}
.footer-bottom-links {
  display: flex;
  gap: 20px;
}
.footer-bottom-links a { color: #94a3b8; }
.footer-bottom-links a:hover { color: #93c5fd; }

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 1100px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 60px;
  }
  .about-img-container { max-width: 520px; margin: 0 auto; }
  .vision-grid { grid-template-columns: 1fr; }
  .quality-grid,
  .why-grid,
  .visualizer-grid,
  .rfq-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero-slider { height: 520px; }
  .slide-title { font-size: 2.8rem; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .process-step-card { grid-template-columns: 1fr; }
  .process-step-img { height: 180px; }
}

@media (max-width: 768px) {
  .nav-menu, .nav-cta { display: none; }
  .mobile-toggle { display: block; }
  .top-bar { display: none; }

  .nav-menu.mobile-open {
    display: flex !important;
    flex-direction: column;
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100vh;
    background: var(--color-primary);
    z-index: 9999;
    justify-content: center;
    align-items: center;
    gap: 20px;
  }
  .nav-menu.mobile-open .nav-item { height: auto; }
  .nav-menu.mobile-open .nav-link {
    color: #ffffff;
    font-size: 1.4rem;
    padding: 10px 0;
    height: auto;
  }
  .nav-menu.mobile-open .dropdown-menu { display: none !important; }

  .hero-slider { height: 450px; }
  .slide-title { font-size: 2rem; }
  .slide-desc { font-size: 0.95rem; }
  .slider-btn-container { flex-direction: column; gap: 10px; }
  .slide-stats, .slide-spec-tags { gap: 14px; }

  .section { padding: 70px 0; }

  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .vision-grid { grid-template-columns: 1fr; }
  .products-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .cert-grid { grid-template-columns: 1fr; }

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

  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom {
    flex-direction: column;
    gap: 14px;
    text-align: center;
  }

  .section-title { font-size: 1.8rem; }
  .slide-title { font-size: 1.9rem; }
  .about-heading { font-size: 1.7rem; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .slide-title { font-size: 1.6rem; }
  .btn { padding: 0.7rem 1.2rem; font-size: 0.82rem; }
  .rfq-form-card { padding: 24px 18px; }
}