/* ============================================
   LANTEK MARINE - Global Styles
   广州蓝亚船舶科技有限公司
   ============================================ */

/* CSS Variables */
:root {
  /* Primary Colors - Ocean Blue */
  --primary-900: #0c2340;
  --primary-800: #134074;
  --primary-700: #1565c0;
  --primary-600: #1976d2;
  --primary-500: #1e88e5;
  --primary-400: #42a5f5;
  --primary-300: #64b5f6;
  --primary-200: #90caf9;
  --primary-100: #bbdefb;
  --primary-50: #e3f2fd;

  /* Accent Colors - Teal/Cyan */
  --accent-700: #00838f;
  --accent-600: #00acc1;
  --accent-500: #00bcd4;
  --accent-400: #26c6da;
  --accent-300: #4dd0e1;
  --accent-200: #80deea;
  --accent-100: #b2ebf2;

  /* Sky Colors */
  --sky-600: #0277bd;
  --sky-500: #039be5;
  --sky-400: #29b6f6;
  --sky-300: #4fc3f7;
  --sky-200: #81d4fa;

  /* Highlight - Cyan */
  --highlight-500: #00bcd4;
  --highlight-400: #26c6da;
  --highlight-300: #4dd0e1;

  /* Neutral Colors */
  --neutral-900: #1a1a2e;
  --neutral-800: #282846;
  --neutral-700: #404060;
  --neutral-600: #585878;
  --neutral-500: #707088;
  --neutral-400: #9898ab;
  --neutral-300: #c0c0cc;
  --neutral-200: #e0e0ea;
  --neutral-100: #f0f0f6;
  --neutral-50: #f8f8fc;

  /* White */
  --white: #ffffff;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--primary-700) 0%, var(--primary-400) 100%);
  --gradient-hero: linear-gradient(160deg, #0c2340 0%, #134074 20%, #1565c0 45%, #1976d2 70%, #00bcd4 100%);
  --gradient-sky: linear-gradient(180deg, #0c2340 0%, #1565c0 40%, #00bcd4 100%);
  --gradient-ocean: linear-gradient(180deg, rgba(12,35,64,0.98) 0%, rgba(21,101,192,0.85) 40%, rgba(0,188,212,0.7) 100%);
  --gradient-ocean-light: linear-gradient(135deg, #e3f2fd 0%, #e0f7fa 50%, #f0f0f6 100%);
  --gradient-glass: linear-gradient(135deg, rgba(255,255,255,0.12) 0%, rgba(255,255,255,0.04) 100%);
  --gradient-card-shine: linear-gradient(135deg, rgba(21,101,192,0.06) 0%, rgba(0,188,212,0.04) 100%);
  --gradient-brand: linear-gradient(135deg, #1565c0 0%, #00bcd4 100%);

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.08), 0 2px 4px -2px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.05);
  --shadow-glow: 0 0 60px rgba(21,101,192,0.15);
  --shadow-glow-accent: 0 0 40px rgba(0,188,212,0.12);

  /* Typography */
  --font-heading: 'Playfair Display', 'Georgia', serif;
  --font-body: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'Fira Code', monospace;

  /* Font Sizes - Fluid Typography */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.8rem);
  --text-sm: clamp(0.85rem, 0.8rem + 0.25vw, 0.9rem);
  --text-base: clamp(0.95rem, 0.9rem + 0.25vw, 1rem);
  --text-lg: clamp(1.05rem, 0.95rem + 0.5vw, 1.15rem);
  --text-xl: clamp(1.15rem, 1rem + 0.75vw, 1.35rem);
  --text-2xl: clamp(1.4rem, 1.1rem + 1.5vw, 1.8rem);
  --text-3xl: clamp(1.8rem, 1.3rem + 2.5vw, 2.5rem);
  --text-4xl: clamp(2.2rem, 1.5rem + 3.5vw, 3.5rem);
  --text-5xl: clamp(2.8rem, 1.8rem + 5vw, 4.5rem);

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 500ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Container */
  --container-max: 1280px;
  --container-wide: 1440px;
}

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

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

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--neutral-700);
  background-color: var(--white);
  overflow-x: hidden;
}

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

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

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  font-size: inherit;
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--primary-900);
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-3xl); }
h4 { font-size: var(--text-2xl); }
h5 { font-size: var(--text-xl); }
h6 { font-size: var(--text-lg); }

.section-label {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--accent-500);
  margin-bottom: var(--space-4);
}

.section-title {
  font-size: var(--text-4xl);
  color: var(--primary-900);
  margin-bottom: var(--space-6);
}

.section-title span {
  color: var(--accent-500);
}

.section-subtitle {
  font-size: var(--text-lg);
  color: var(--neutral-600);
  max-width: 640px;
  line-height: 1.8;
}

/* ============================================
   Layout
   ============================================ */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container-wide {
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.section {
  padding: var(--space-24) 0;
  position: relative;
}

.section-sm {
  padding: var(--space-16) 0;
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--space-4) 0;
  transition: all var(--transition-base);
  background: transparent;
}

.navbar.scrolled {
  background: rgba(12,35,64,0.92);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  padding: var(--space-3) 0;
  box-shadow: 0 4px 30px rgba(0,0,0,0.2);
}

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

.navbar-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.navbar-brand .logo-img {
  height: 48px;
  width: auto;
  filter: drop-shadow(0 2px 8px rgba(0,0,0,0.3));
  transition: transform var(--transition-base), filter var(--transition-base);
}

.navbar-brand:hover .logo-img {
  transform: scale(1.03);
  filter: drop-shadow(0 4px 12px rgba(21,101,192,0.3));
}

.navbar-brand .brand-text {
  display: flex;
  flex-direction: column;
}

.navbar-brand .brand-name {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: 1px;
}

.navbar-brand .brand-sub {
  font-size: var(--text-xs);
  color: var(--accent-300);
  letter-spacing: 2px;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 6px;
}

.navbar-brand .brand-sub::before {
  content: '';
  width: 5px;
  height: 5px;
  background: var(--accent-500);
  border-radius: 50%;
  animation: nav-signal-pulse 2.5s ease-in-out infinite;
  flex-shrink: 0;
}

@keyframes nav-signal-pulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 4px rgba(0,188,212,0.5); }
  50% { opacity: 0.4; box-shadow: 0 0 0 rgba(0,188,212,0); }
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-links a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: rgba(255,255,255,0.8);
  letter-spacing: 0.5px;
  position: relative;
  padding: var(--space-2) 0;
  transition: color var(--transition-base);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-400);
  transition: width var(--transition-base);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--white);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-lang-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: var(--radius-full);
  padding: 4px 12px;
  color: var(--white);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 1px;
  cursor: pointer;
  transition: all var(--transition-base);
}

.nav-lang-toggle:hover {
  background: rgba(255,255,255,0.2);
}

/* Mobile Menu */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  cursor: pointer;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--white);
  transition: all var(--transition-base);
  border-radius: 2px;
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 12px 28px;
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.5px;
  border-radius: var(--radius-md);
  transition: all var(--transition-spring);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.2), transparent);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.btn:hover::before {
  opacity: 1;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-400) 100%);
  color: var(--white);
  box-shadow: 0 4px 20px rgba(21,101,192,0.3);
  border: 1px solid rgba(255,255,255,0.08);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(21,101,192,0.4), 0 0 20px rgba(0,188,212,0.12);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border: 2px solid rgba(255,255,255,0.3);
}

.btn-outline:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.6);
  transform: translateY(-2px);
}

.btn-accent {
  background: linear-gradient(135deg, var(--accent-600) 0%, var(--accent-400) 100%);
  color: var(--white);
  box-shadow: 0 4px 20px rgba(0,150,168,0.3);
  border: 1px solid rgba(255,255,255,0.08);
}

.btn-accent:hover {
  background: linear-gradient(135deg, var(--accent-500) 0%, var(--accent-300) 100%);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0,150,168,0.4), 0 0 20px rgba(77,208,225,0.12);
}

.btn-dark {
  background: linear-gradient(135deg, var(--primary-800) 0%, var(--primary-700) 100%);
  color: var(--white);
  box-shadow: 0 4px 20px rgba(12,35,64,0.25);
}

.btn-lg {
  padding: 16px 36px;
  font-size: var(--text-base);
  border-radius: var(--radius-lg);
}

/* ============================================
   Cards
   ============================================ */
.card {
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  transition: all var(--transition-spring);
  border: 1px solid var(--neutral-200);
  position: relative;
  overflow: hidden;
}

.card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-500), var(--accent-500));
  opacity: 0;
  transition: opacity var(--transition-base);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl), var(--shadow-glow);
  border-color: var(--primary-200);
}

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

.card-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-6);
}

.card-icon svg {
  width: 28px;
  height: 28px;
  stroke-width: 1.5;
}

.card-icon-primary {
  background: var(--primary-50);
  color: var(--primary-500);
}

.card-icon-accent {
  background: var(--accent-100);
  color: var(--accent-600);
}

.card h3 {
  font-size: var(--text-xl);
  margin-bottom: var(--space-3);
}

.card p {
  color: var(--neutral-500);
  line-height: 1.7;
}

/* Glass Card */
.glass-card {
  background: rgba(255,255,255,0.05);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  color: var(--white);
  transition: all var(--transition-spring);
}

.glass-card:hover {
  background: rgba(255,255,255,0.1);
  transform: translateY(-4px);
  border-color: rgba(255,255,255,0.2);
}

/* ============================================
   Hero Section - Satellite & Navigation Tech
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--gradient-hero);
  overflow: hidden;
}

/* Canvas for satellite orbit animation */
#satelliteCanvas {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

/* Atmospheric light rays from top-right */
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 80%;
  height: 120%;
  background: radial-gradient(ellipse at center, rgba(0,188,212,0.05) 0%, transparent 60%);
  z-index: 0;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 40%;
  background: linear-gradient(180deg, transparent, rgba(12,35,64,0.4) 60%, rgba(12,35,64,0.7));
  z-index: 2;
  pointer-events: none;
}

.hero-particles {
  position: absolute;
  inset: 0;
  overflow: hidden;
  z-index: 1;
  display: none; /* Replaced by Canvas animation */
}

.hero-particles .particle {
  position: absolute;
  background: rgba(255,255,255,0.25);
  border-radius: 50%;
  animation: float-particle 15s infinite ease-in-out;
}

.hero-particles .particle:nth-child(1) { left: 8%; top: 15%; width: 3px; height: 3px; animation-delay: 0s; animation-duration: 14s; }
.hero-particles .particle:nth-child(2) { left: 18%; top: 55%; width: 5px; height: 5px; animation-delay: 2s; animation-duration: 18s; }
.hero-particles .particle:nth-child(3) { left: 35%; top: 25%; width: 3px; height: 3px; animation-delay: 4s; animation-duration: 20s; }
.hero-particles .particle:nth-child(4) { left: 55%; top: 65%; width: 4px; height: 4px; animation-delay: 1s; animation-duration: 16s; }
.hero-particles .particle:nth-child(5) { left: 75%; top: 35%; width: 6px; height: 6px; animation-delay: 3s; animation-duration: 22s; }
.hero-particles .particle:nth-child(6) { left: 88%; top: 75%; width: 3px; height: 3px; animation-delay: 5s; animation-duration: 13s; }
.hero-particles .particle:nth-child(7) { left: 28%; top: 85%; width: 4px; height: 4px; animation-delay: 2.5s; animation-duration: 19s; }
.hero-particles .particle:nth-child(8) { left: 65%; top: 8%; width: 3px; height: 3px; animation-delay: 6s; animation-duration: 15s; }
.hero-particles .particle:nth-child(9) { left: 45%; top: 45%; width: 2px; height: 2px; animation-delay: 7s; animation-duration: 17s; }
.hero-particles .particle:nth-child(10) { left: 92%; top: 50%; width: 5px; height: 5px; animation-delay: 1.5s; animation-duration: 21s; }

@keyframes float-particle {
  0%, 100% { transform: translate(0, 0) scale(1); opacity: 0.15; }
  20% { transform: translate(25px, -50px) scale(1.3); opacity: 0.4; }
  40% { transform: translate(-15px, -90px) scale(0.8); opacity: 0.2; }
  60% { transform: translate(35px, -60px) scale(1.6); opacity: 0.35; }
  80% { transform: translate(-10px, -110px) scale(1.1); opacity: 0.15; }
}

/* Hero content needs to be above canvas */
.hero-content {
  position: relative;
  z-index: 5;
  max-width: 720px;
}

/* Satellite tech badge */
.satellite-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(77,208,225,0.08);
  border: 1px solid rgba(77,208,225,0.15);
  border-radius: 9999px;
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--highlight-500);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: var(--space-6);
}

.satellite-badge .signal-dot {
  width: 6px;
  height: 6px;
  background: #00bcd4;
  border-radius: 50%;
  animation: signal-pulse 2s ease-in-out infinite;
}

@keyframes signal-pulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(0,188,212,0.4); }
  50% { opacity: 0.6; box-shadow: 0 0 0 6px rgba(0,188,212,0); }
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 720px;
}

.hero-content .section-label {
  color: var(--accent-300);
  margin-bottom: var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.hero-content .section-label::before {
  content: '';
  width: 40px;
  height: 2px;
  background: var(--accent-400);
}

.hero-content h1 {
  font-size: var(--text-5xl);
  color: var(--white);
  margin-bottom: var(--space-6);
  line-height: 1.1;
}

.hero-content h1 .highlight {
  background: linear-gradient(135deg, var(--accent-300), var(--accent-500));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-content .hero-desc {
  font-size: var(--text-lg);
  color: rgba(255,255,255,0.85);
  line-height: 1.8;
  margin-bottom: var(--space-10);
  max-width: 560px;
}

.hero-btns {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  gap: var(--space-12);
  margin-top: var(--space-16);
  padding-top: var(--space-10);
  border-top: 1px solid rgba(255,255,255,0.1);
}

.hero-stat {
  text-align: left;
}

.hero-stat .stat-number {
  font-family: var(--font-heading);
  font-size: var(--text-4xl);
  font-weight: 700;
  color: var(--white);
  line-height: 1;
  margin-bottom: var(--space-1);
}

.hero-stat .stat-number span {
  color: var(--accent-400);
}

.hero-stat .stat-label {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.5);
  letter-spacing: 1px;
}

/* Wave divider - Ocean wave */
.wave-divider {
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  overflow: hidden;
  line-height: 0;
  z-index: 3;
}

.wave-divider svg {
  position: relative;
  display: block;
  width: calc(100% + 1.3px);
  height: 100px;
}

.wave-divider .shape-fill {
  fill: var(--white);
}

/* ============================================
   Section Header
   ============================================ */
.section-header {
  text-align: center;
  margin-bottom: var(--space-16);
}

.section-header .section-subtitle {
  margin: 0 auto;
}

/* ============================================
   Grid Layouts
   ============================================ */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
}

/* ============================================
   Feature Section
   ============================================ */
.features {
  background: var(--neutral-50);
}

/* ============================================
   About Section
   ============================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

.about-image {
  position: relative;
  border-radius: var(--radius-2xl);
  overflow: hidden;
}

.about-image .img-placeholder {
  width: 100%;
  height: 480px;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: var(--text-2xl);
}

.about-image .floating-badge {
  position: absolute;
  bottom: var(--space-6);
  right: var(--space-6);
  background: var(--white);
  padding: var(--space-4) var(--space-6);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.about-image .floating-badge .badge-number {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--primary-500);
}

.about-image .floating-badge .badge-text {
  font-size: var(--text-sm);
  color: var(--neutral-500);
  line-height: 1.4;
}

.about-content .about-text {
  margin-bottom: var(--space-8);
  color: var(--neutral-600);
  line-height: 1.8;
}

.about-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

.about-list-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--neutral-700);
}

.about-list-item svg {
  width: 20px;
  height: 20px;
  color: var(--accent-500);
  flex-shrink: 0;
}

/* ============================================
   Products Section
   ============================================ */
.products-section {
  background: var(--neutral-50);
}

.product-tabs {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
  margin-bottom: var(--space-12);
}

.product-tab {
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--neutral-600);
  border: 2px solid var(--neutral-200);
  transition: all var(--transition-base);
  cursor: pointer;
}

.product-tab.active,
.product-tab:hover {
  background: var(--primary-500);
  color: var(--white);
  border-color: var(--primary-500);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

.product-card {
  background: var(--white);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--transition-spring);
  border: 1px solid var(--neutral-200);
  position: relative;
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl), var(--shadow-glow);
  border-color: var(--primary-200);
}

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

/* Scan line animation on card images */
.product-card .card-image::after {
  content: '';
  position: absolute;
  top: -100%;
  left: 0;
  right: 0;
  height: 50%;
  background: linear-gradient(180deg, transparent, rgba(77,208,225,0.08), transparent);
  animation: scan-line 4s ease-in-out infinite;
  pointer-events: none;
}

/* Radar sweep overlay */
.product-card .card-image::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 140%;
  height: 140%;
  transform: translate(-50%, -50%);
  background: conic-gradient(
    from 0deg,
    transparent 0deg,
    rgba(77,208,225,0.06) 30deg,
    transparent 60deg
  );
  animation: radar-sweep 6s linear infinite;
  pointer-events: none;
  z-index: 1;
}

@keyframes radar-sweep {
  from { transform: translate(-50%, -50%) rotate(0deg); }
  to { transform: translate(-50%, -50%) rotate(360deg); }
}

@keyframes scan-line {
  0%, 100% { top: -50%; }
  50% { top: 100%; }
}

.product-card .card-image .product-badge {
  position: absolute;
  top: var(--space-4);
  left: var(--space-4);
  background: var(--accent-500);
  color: var(--white);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 1px;
}

.product-card .card-image svg {
  width: 64px;
  height: 64px;
  stroke: rgba(255,255,255,0.8);
  stroke-width: 1;
}

.product-card .card-body {
  padding: var(--space-6);
}

.product-card .card-body h4 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-2);
}

.product-card .card-body p {
  color: var(--neutral-500);
  font-size: var(--text-sm);
  line-height: 1.7;
  margin-bottom: var(--space-4);
}

.product-card .card-body .card-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--primary-500);
  font-size: var(--text-sm);
  font-weight: 600;
  transition: gap var(--transition-base);
}

.product-card .card-body .card-link:hover {
  gap: var(--space-3);
  color: var(--primary-700);
}

/* ============================================
   Services Section
   ============================================ */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

.service-card {
  position: relative;
  padding: var(--space-10);
  background: var(--white);
  border-radius: var(--radius-xl);
  border: 1px solid var(--neutral-200);
  transition: all var(--transition-spring);
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-500), var(--accent-500), var(--highlight-500), var(--accent-500), var(--primary-500));
  background-size: 200% 100%;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  animation: gradient-flow 3s linear infinite;
}

@keyframes gradient-flow {
  0% { background-position: 0% 50%; }
  100% { background-position: 200% 50%; }
}

.service-card:hover::before {
  transform: scaleX(1);
}

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl), var(--shadow-glow-accent);
  border-color: var(--accent-200);
}

.service-card .service-num {
  font-family: var(--font-heading);
  font-size: var(--text-5xl);
  font-weight: 700;
  color: var(--neutral-100);
  line-height: 1;
  margin-bottom: var(--space-4);
  transition: color var(--transition-base);
}

.service-card:hover .service-num {
  color: var(--primary-100);
}

.service-card h3 {
  font-size: var(--text-xl);
  margin-bottom: var(--space-3);
}

.service-card p {
  color: var(--neutral-500);
  font-size: var(--text-sm);
  line-height: 1.7;
  margin-bottom: var(--space-4);
}

.service-card .cert-badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.cert-badge {
  display: inline-block;
  padding: 2px 10px;
  background: var(--primary-50);
  color: var(--primary-600);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 1px;
}

/* ============================================
   Partners / Certifications
   ============================================ */
.partners-section {
  background: var(--neutral-50);
}

.partners-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-8);
  align-items: center;
}

.partner-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-8);
  background: var(--white);
  border-radius: var(--radius-xl);
  border: 1px solid var(--neutral-100);
  transition: all var(--transition-base);
}

.partner-item:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.partner-item .partner-logo {
  width: 120px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--primary-800);
}

.partner-item .partner-name {
  font-size: var(--text-sm);
  color: var(--neutral-500);
  text-align: center;
}

/* Role label under partner name */
.partner-item .partner-role {
  font-size: var(--text-xs);
  color: var(--accent-500);
  text-align: center;
  margin-top: var(--space-1);
  font-weight: 600;
  letter-spacing: 0.5px;
}

/* Classification society items get a slightly different style */
.partners-class .partner-item {
  border-color: rgba(22,163,74,0.12);
}

.partners-class .partner-item:hover {
  border-color: rgba(22,163,74,0.3);
  box-shadow: 0 4px 20px rgba(22,163,74,0.06);
}

.partners-class .partner-role {
  color: #16a34a;
}

/* ============================================
   News Section
   ============================================ */
.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

.news-card {
  background: var(--white);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--transition-spring);
  border: 1px solid var(--neutral-100);
}

.news-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.news-card .news-image {
  width: 100%;
  height: 200px;
  background: var(--gradient-primary);
  position: relative;
}

.news-card .news-image .news-date {
  position: absolute;
  bottom: var(--space-4);
  left: var(--space-4);
  background: var(--white);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  text-align: center;
}

.news-card .news-image .news-date .date-day {
  display: block;
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--primary-500);
  line-height: 1;
}

.news-card .news-image .news-date .date-month {
  display: block;
  font-size: var(--text-xs);
  color: var(--neutral-500);
}

.news-card .news-body {
  padding: var(--space-6);
}

.news-card .news-body .news-tag {
  display: inline-block;
  padding: 2px 10px;
  background: var(--accent-100);
  color: var(--accent-600);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  margin-bottom: var(--space-3);
}

.news-card .news-body h3 {
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--space-2);
  line-height: 1.5;
  transition: color var(--transition-base);
}

.news-card .news-body h3:hover {
  color: var(--primary-500);
}

.news-card .news-body p {
  color: var(--neutral-500);
  font-size: var(--text-sm);
  line-height: 1.7;
}

/* CMS dynamic news cards (rendered by cms-loader.js) */
.news-card .news-content {
  padding: var(--space-6);
}

.news-card .news-content .news-meta {
  margin-bottom: var(--space-2);
}

.news-card .news-content .news-date {
  display: inline-block;
  font-size: var(--text-xs);
  color: var(--neutral-400);
  font-weight: 500;
}

.news-card .news-content h3 {
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--space-2);
  line-height: 1.5;
  transition: color var(--transition-base);
}

.news-card .news-content h3:hover {
  color: var(--primary-500);
}

.news-card .news-content p {
  color: var(--neutral-500);
  font-size: var(--text-sm);
  line-height: 1.7;
  margin-bottom: var(--space-3);
}

.news-card .news-content .news-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--primary-500);
  font-size: var(--text-sm);
  font-weight: 600;
  transition: gap var(--transition-base), color var(--transition-base);
}

.news-card .news-content .news-link:hover {
  gap: var(--space-3);
  color: var(--primary-700);
}

/* ============================================
   Contact Section
   ============================================ */
.contact-section {
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
}

/* Underwater light effect for contact section */
.contact-section::before {
  content: '';
  position: absolute;
  top: -40%;
  left: -30%;
  width: 70%;
  height: 100%;
  background: radial-gradient(ellipse at center, rgba(21,101,192,0.05) 0%, transparent 60%);
  pointer-events: none;
}

.contact-section::after {
  content: '';
  position: absolute;
  bottom: -30%;
  right: -20%;
  width: 60%;
  height: 80%;
  background: radial-gradient(ellipse at center, rgba(0,188,212,0.05) 0%, transparent 60%);
  pointer-events: none;
}

.contact-section .section-title {
  color: var(--white);
}

.contact-section .section-label {
  color: var(--accent-300);
}

.contact-section .section-subtitle {
  color: rgba(255,255,255,0.85);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-12);
}

.contact-info-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.contact-info-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  color: var(--white);
}

.contact-info-item .info-icon {
  width: 48px;
  height: 48px;
  background: rgba(255,255,255,0.1);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-info-item .info-icon svg {
  width: 22px;
  height: 22px;
  stroke: var(--accent-400);
}

.contact-info-item .info-text h4 {
  font-size: var(--text-base);
  color: var(--white);
  margin-bottom: var(--space-1);
  font-family: var(--font-body);
  font-weight: 600;
}

.contact-info-item .info-text p {
  color: rgba(255,255,255,0.6);
  font-size: var(--text-sm);
}

.contact-form {
  background: rgba(255,255,255,0.04);
  backdrop-filter: blur(24px) saturate(160%);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-2xl);
  padding: var(--space-10);
  position: relative;
  z-index: 1;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.form-group {
  margin-bottom: var(--space-4);
}

.form-group label {
  display: block;
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.7);
  margin-bottom: var(--space-2);
  font-weight: 500;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius-md);
  color: var(--white);
  font-size: var(--text-sm);
  font-family: var(--font-body);
  transition: all var(--transition-base);
  outline: none;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: rgba(255,255,255,0.3);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--accent-400);
  background: rgba(255,255,255,0.12);
  box-shadow: 0 0 0 3px rgba(18,188,208,0.15);
}

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

/* ============================================
   Footer - Deep Ocean
   ============================================ */
.footer {
  background: var(--primary-900);
  color: var(--white);
  padding: var(--space-20) 0 0;
  position: relative;
  overflow: hidden;
}

/* Subtle top glow line */
.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-500), var(--primary-500), transparent);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-16);
}

.footer-brand .brand-name {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-4);
}

.footer-brand .brand-desc {
  color: var(--neutral-400);
  font-size: var(--text-sm);
  line-height: 1.7;
  margin-bottom: var(--space-6);
}

.footer-socials {
  display: flex;
  gap: var(--space-3);
}

.footer-socials a {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
}

.footer-socials a:hover {
  background: linear-gradient(135deg, var(--accent-600), var(--accent-400));
  border-color: var(--accent-400);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,150,168,0.25);
}

.footer-socials a svg {
  width: 18px;
  height: 18px;
  stroke: var(--white);
}

.footer-col h4 {
  color: var(--white);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--space-6);
}

.footer-col ul li {
  margin-bottom: var(--space-3);
}

.footer-col ul li a {
  color: var(--neutral-400);
  font-size: var(--text-sm);
  transition: all var(--transition-base);
}

.footer-col ul li a:hover {
  color: var(--accent-400);
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: var(--space-6) 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-bottom p {
  color: var(--neutral-400);
  font-size: var(--text-xs);
}

.footer-bottom .footer-links {
  display: flex;
  gap: var(--space-6);
}

.footer-bottom .footer-links a {
  color: var(--neutral-400);
  font-size: var(--text-xs);
}

.footer-bottom .footer-links a:hover {
  color: var(--accent-400);
}

/* ============================================
   Page Header (Inner pages)
   ============================================ */
.page-header {
  background: var(--gradient-hero);
  padding: var(--space-32) 0 var(--space-16);
  text-align: center;
  position: relative;
  overflow: hidden;
}

/* Tech grid overlay for inner pages */
.page-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(77,208,225,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(77,208,225,0.04) 1px, transparent 1px);
  background-size: 50px 50px;
  z-index: 0;
}

.page-header #satelliteCanvas {
  z-index: 0;
}

.page-header > *:not(canvas) {
  position: relative;
  z-index: 1;
}

/* Animated scan beam for page headers */
.page-header::after {
  content: '';
  position: absolute;
  top: 0;
  left: -50%;
  width: 200%;
  height: 100%;
  background: linear-gradient(90deg, transparent 48%, rgba(77,208,225,0.03) 50%, transparent 52%);
  animation: header-scan 8s linear infinite;
  z-index: 0;
}

@keyframes header-scan {
  0% { transform: translateX(-25%); }
  100% { transform: translateX(25%); }
}

.page-header h1 {
  color: var(--white);
  margin-bottom: var(--space-4);
}

.page-header p {
  color: rgba(255,255,255,0.8);
  font-size: var(--text-lg);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.8;
}

.page-header .section-label {
  color: var(--accent-300);
  margin-bottom: var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.page-header .section-label::before {
  content: '';
  width: 40px;
  height: 2px;
  background: var(--accent-400);
}

.page-header .breadcrumb {
  display: flex;
  justify-content: center;
  gap: var(--space-2);
  color: rgba(255,255,255,0.5);
  font-size: var(--text-sm);
}

.page-header .breadcrumb a {
  color: rgba(255,255,255,0.6);
}

.page-header .breadcrumb a:hover {
  color: var(--accent-400);
}

.page-header .breadcrumb .separator {
  color: rgba(255,255,255,0.3);
}

/* ============================================
   Animations
   ============================================ */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.fade-in-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.fade-in-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

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

.stagger-children.visible > *:nth-child(1) { transition-delay: 0.1s; }
.stagger-children.visible > *:nth-child(2) { transition-delay: 0.2s; }
.stagger-children.visible > *:nth-child(3) { transition-delay: 0.3s; }
.stagger-children.visible > *:nth-child(4) { transition-delay: 0.4s; }
.stagger-children.visible > *:nth-child(5) { transition-delay: 0.5s; }
.stagger-children.visible > *:nth-child(6) { transition-delay: 0.6s; }

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

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .news-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .partners-grid { grid-template-columns: repeat(3, 1fr); }
  .about-grid { grid-template-columns: 1fr; gap: var(--space-8); }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }

  .nav-links.mobile-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(10, 22, 40, 0.98);
    padding: var(--space-8) var(--space-6);
    gap: var(--space-6);
    backdrop-filter: blur(20px);
  }

  .hero-stats {
    flex-direction: column;
    gap: var(--space-6);
  }

  .grid-2,
  .grid-3,
  .grid-4 { grid-template-columns: 1fr; }

  .product-grid,
  .services-grid,
  .news-grid { grid-template-columns: 1fr; }

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

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

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

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

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-4);
    text-align: center;
  }

  .product-tabs {
    flex-wrap: wrap;
  }

  .about-list { grid-template-columns: 1fr; }

  .hero-content h1 { font-size: var(--text-4xl); }
}

@media (max-width: 480px) {
  .hero-btns {
    flex-direction: column;
  }

  .hero-btns .btn {
    width: 100%;
    text-align: center;
  }

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

/* ============================================
   Utility Classes
   ============================================ */
.text-center { text-align: center; }
.text-white { color: var(--white); }
.text-primary { color: var(--primary-500); }
.text-accent { color: var(--accent-500); }
.text-muted { color: var(--neutral-500); }

.bg-primary { background-color: var(--primary-500); }
.bg-dark { background-color: var(--primary-900); }
.bg-light { background-color: var(--neutral-50); }

.mt-4 { margin-top: var(--space-4); }
.mt-8 { margin-top: var(--space-8); }
.mt-16 { margin-top: var(--space-16); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-16 { margin-bottom: var(--space-16); }

.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* Language attribute for i18n */
[data-lang="en"] .zh { display: none !important; }
[data-lang="en"] .en { display: revert !important; }

[data-lang="zh"] .zh { display: revert !important; }
[data-lang="zh"] .en { display: none !important; }

/* ============================================
   Scrollbar
   ============================================ */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--neutral-100);
}

::-webkit-scrollbar-thumb {
  background: var(--neutral-400);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--neutral-500);
}

/* ============================================
   Loading / Preloader
   ============================================ */
.preloader {
  position: fixed;
  inset: 0;
  background: var(--primary-900);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.preloader.hidden {
  opacity: 0;
  visibility: hidden;
}

.preloader .spinner {
  width: 48px;
  height: 48px;
  border: 3px solid rgba(255,255,255,0.1);
  border-top-color: var(--accent-400);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Back to top */
.back-to-top {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-8);
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary-600), var(--accent-600));
  color: var(--white);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  z-index: 999;
  box-shadow: 0 4px 20px rgba(16,56,136,0.4);
  border: 1px solid rgba(255,255,255,0.1);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(26,58,110,0.5), 0 0 15px rgba(232,124,45,0.2);
}

/* ============================================
   Product Card Enhancements (LANTEK Brand Style)
   ============================================ */
.product-card .card-image {
  position: relative;
  overflow: hidden;
}

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

.product-card:hover .card-image img {
  transform: scale(1.05);
}

.product-badge {
  background: linear-gradient(135deg, var(--primary-700), var(--accent-600)) !important;
  box-shadow: 0 2px 12px rgba(26,58,110,0.3) !important;
}

/* PDF Download Button */
.btn-pdf-download {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--white);
  background: linear-gradient(135deg, var(--accent-600), var(--accent-700));
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  margin-top: var(--space-3);
}

.btn-pdf-download:hover {
  background: linear-gradient(135deg, #d66a22, var(--accent-600));
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(232,124,45,0.35);
}

.btn-pdf-download svg {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
}

/* Product Detail - PDF Download Section */
.product-pdf-section {
  background: linear-gradient(135deg, rgba(26,58,110,0.04), rgba(232,124,45,0.06));
  border: 1px solid rgba(232,124,45,0.15);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-5);
  margin-top: var(--space-8);
  transition: all var(--transition-base);
}

.product-pdf-section:hover {
  border-color: rgba(232,124,45,0.3);
  box-shadow: 0 4px 24px rgba(232,124,45,0.1);
}

.pdf-icon-wrapper {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--accent-600), var(--accent-700));
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.pdf-icon-wrapper svg {
  width: 28px;
  height: 28px;
  color: var(--white);
}

.pdf-info h5 {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--primary-900);
  margin-bottom: 4px;
}

.pdf-info p {
  font-size: var(--text-xs);
  color: var(--neutral-500);
}

/* Product Specs Table */
.product-specs-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: var(--space-6);
}

.product-specs-table th,
.product-specs-table td {
  padding: var(--space-3) var(--space-4);
  text-align: left;
  border-bottom: 1px solid var(--neutral-200);
  font-size: var(--text-sm);
}

.product-specs-table th {
  background: var(--neutral-50);
  color: var(--primary-800);
  font-weight: 600;
  width: 30%;
}

.product-specs-table td {
  color: var(--neutral-700);
}

.product-specs-table tr:last-child td,
.product-specs-table tr:last-child th {
  border-bottom: none;
}

/* Brand Tab Active State - Orange accent */
.product-tab.active {
  background: linear-gradient(135deg, var(--primary-700), var(--primary-500)) !important;
  position: relative;
}

.product-tab.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 3px;
  background: var(--accent-600);
  border-radius: 2px;
}

.product-tab:hover:not(.active) {
  color: var(--accent-600) !important;
  border-color: var(--accent-300) !important;
}

/* Footer Logo in brand area */
.footer-brand-area .brand-logo-img {
  max-width: 180px;
  height: auto;
  filter: brightness(0.9) drop-shadow(0 2px 8px rgba(255,255,255,0.1));
}

/* Lightweight Map - Pulse Animation */
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: translate(-50%,-50%) scale(1); }
  50% { opacity: 0.4; transform: translate(-50%,-50%) scale(2); }
}

#lightweight-map:hover {
  box-shadow: 0 4px 24px rgba(26,58,110,0.3);
}