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

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

html {
  font-family: var(--font-family);
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--color-bg-base);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* Background Glowing Accents & Animated Auroras */
body::before {
  content: '';
  position: absolute;
  top: 5%;
  left: 10%;
  width: 40vw;
  height: 40vw;
  background: radial-gradient(circle, rgba(var(--color-primary-rgb), 0.05) 0%, rgba(255, 255, 255, 0) 70%);
  z-index: -1;
  pointer-events: none;
  animation: aurora-1 25s infinite ease-in-out alternate;
}

body::after {
  content: '';
  position: absolute;
  top: 40%;
  right: -10%;
  width: 50vw;
  height: 50vw;
  background: radial-gradient(circle, rgba(var(--color-secondary-rgb), 0.04) 0%, rgba(255, 255, 255, 0) 70%);
  z-index: -1;
  pointer-events: none;
  animation: aurora-2 30s infinite ease-in-out alternate;
}

@keyframes aurora-1 {
  0% { transform: translate(0, 0) scale(1) rotate(0deg); }
  50% { transform: translate(80px, -50px) scale(1.15) rotate(180deg); }
  100% { transform: translate(0, 0) scale(1) rotate(360deg); }
}

@keyframes aurora-2 {
  0% { transform: translate(0, 0) scale(1) rotate(0deg); }
  50% { transform: translate(-100px, 60px) scale(1.2) rotate(-180deg); }
  100% { transform: translate(0, 0) scale(1) rotate(-360deg); }
}

/* Global Particles Layer */
.global-particles {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 9999;
  pointer-events: none;
}

/* Floating Animation */
@keyframes float {
  0% { transform: translateY(0px); }
  50% { transform: translateY(-15px); }
  100% { transform: translateY(0px); }
}
.float-anim {
  animation: float 6s ease-in-out infinite;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-base);
}

::-webkit-scrollbar-thumb {
  background: rgba(var(--color-primary-rgb), 0.15);
  border-radius: var(--radius-full);
  border: 2px solid var(--color-bg-base);
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(var(--color-primary-rgb), 0.3);
}

/* Selection */
::selection {
  background-color: rgba(var(--color-primary-rgb), 0.1);
  color: var(--color-primary);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-dark);
  font-weight: 700;
  line-height: 1.25;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-family: 'Outfit', var(--font-family);
  letter-spacing: -0.03em;
}

h2 {
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  letter-spacing: -0.02em;
  position: relative;
  display: inline-block;
  margin-bottom: var(--spacing-md);
}

/* H2 Underline Accent */
h2::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -8px;
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  border-radius: var(--radius-full);
}

h3 {
  font-size: clamp(1.25rem, 2vw, 1.75rem);
}

p {
  color: var(--color-text);
  font-size: 1.05rem;
}

p.lead {
  font-size: clamp(1.1rem, 1.5vw, 1.25rem);
  color: var(--color-text-muted);
}

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

a:hover {
  color: var(--color-primary-light);
}

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

/* Utilities */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--spacing-md);
  padding-right: var(--spacing-md);
}

.text-center { text-align: center; }
.flex { display: flex; }
.grid { display: grid; }

/* Sections */
section {
  padding: var(--spacing-xl) 0;
  position: relative;
}

/* Glassmorphism Styling */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

.glass-card {
  background: radial-gradient(800px circle at var(--mouse-x) var(--mouse-y), rgba(var(--color-primary-rgb), 0.08), transparent 45%), rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.85);
  box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.05);
  transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), background var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.glass-card:hover {
  transform: translateY(-10px);
  background: radial-gradient(800px circle at var(--mouse-x) var(--mouse-y), rgba(var(--color-primary-rgb), 0.15), transparent 45%), rgba(255, 255, 255, 0.9);
  box-shadow: 0 15px 35px -5px rgba(0, 85, 255, 0.12), 0 0 20px rgba(0, 85, 255, 0.1);
  border-color: rgba(var(--color-primary-rgb), 0.4);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 2rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: all var(--transition-normal);
  cursor: pointer;
  border: none;
  font-size: 1rem;
  position: relative;
  overflow: hidden;
  gap: 8px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, #0077ff 100%);
  color: #ffffff;
  box-shadow: 0 10px 20px -5px rgba(var(--color-primary-rgb), 0.3);
}

.btn-primary:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: 0 20px 30px -5px rgba(var(--color-primary-rgb), 0.5), 0 0 15px rgba(var(--color-primary-rgb), 0.3);
}

/* Button Sweep Light Animation */
.btn-sweep::after {
  content: '';
  position: absolute;
  top: 0;
  left: -150%;
  width: 80%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
  transform: skewX(-25deg);
  transition: 0.75s;
}

.btn-sweep:hover::after {
  left: 150%;
  transition: 0.75s;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.8);
  color: var(--color-dark);
  border: 1px solid rgba(var(--color-primary-rgb), 0.15);
  backdrop-filter: blur(4px);
}

.btn-secondary:hover {
  background: var(--color-bg-pure);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.btn-accent {
  background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-secondary-light) 100%);
  color: #ffffff;
  box-shadow: 0 10px 20px -5px rgba(var(--color-secondary-rgb), 0.3);
}

.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 25px -5px rgba(var(--color-secondary-rgb), 0.45);
}

/* Header & Nav */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  z-index: 1000;
  transition: all var(--transition-normal);
}

header.scrolled {
  height: 70px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0, 85, 255, 0.08);
  box-shadow: var(--shadow-sm);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.5rem;
  color: var(--color-dark);
  font-family: 'Outfit', var(--font-family);
  letter-spacing: -0.02em;
}

/* Customized Logo Icon */
.logo-icon {
  position: relative;
  width: 32px;
  height: 32px;
}

.logo-circle {
  position: absolute;
  width: 24px;
  height: 24px;
  border: 4px solid var(--color-primary);
  border-radius: var(--radius-full);
  top: 0;
  left: 0;
}

.logo-wave {
  position: absolute;
  width: 14px;
  height: 14px;
  border-bottom: 3px solid var(--color-secondary);
  border-right: 3px solid var(--color-secondary);
  border-bottom-right-radius: 4px;
  bottom: 0;
  right: 0;
  transform: rotate(45deg);
}

.logo-dot {
  position: absolute;
  width: 6px;
  height: 6px;
  background-color: var(--color-red);
  border-radius: var(--radius-full);
  top: 8px;
  left: 8px;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.logo-cn {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 1px;
}

.logo-en {
  font-size: 0.6rem;
  font-weight: 500;
  letter-spacing: 0.5px;
  color: var(--color-text-muted);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-md);
  align-items: center;
}

.nav-link {
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
  padding: 0.5rem 0;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  transition: all var(--transition-fast);
  transform: translateX(-50%);
}

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

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

.nav-btn {
  margin-left: var(--spacing-xs);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 30px;
  height: 24px;
  position: relative;
}

.menu-bar {
  display: block;
  width: 100%;
  height: 3px;
  background-color: var(--color-dark);
  border-radius: var(--radius-full);
  position: absolute;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.menu-bar:nth-child(1) { top: 0; }
.menu-bar:nth-child(2) { top: 10px; }
.menu-bar:nth-child(3) { top: 20px; }

/* Hero Section (第一屏 沉浸式视觉设计) */
.hero {
  height: 100vh;
  min-height: 750px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background-color: #ffffff;
  overflow: hidden;
  padding: 0;
}

/* Background image blending overlay */
.hero-bg-image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url('../assets/zhendu_hero_bg.png');
  background-size: cover;
  background-position: center;
  opacity: 0.85;
  z-index: 1;
}

/* Soft gradients and color blots on top of background */
.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.95) 75%),
              linear-gradient(180deg, rgba(248, 250, 252, 0.2) 0%, rgba(248, 250, 252, 1) 98%);
  z-index: 2;
  pointer-events: none;
}

/* Particle Canvas Container */
.hero-canvas-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 3;
  pointer-events: none;
}

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

.hero .container {
  position: relative;
  z-index: 5;
}

.hero-content {
  max-width: 720px;
  margin-top: 60px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0.5rem 1.2rem;
  background: rgba(var(--color-primary-rgb), 0.06);
  border: 1px solid rgba(var(--color-primary-rgb), 0.12);
  border-radius: var(--radius-full);
  margin-bottom: var(--spacing-md);
  color: var(--color-primary);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  backdrop-filter: blur(4px);
  box-shadow: 0 4px 10px rgba(0, 85, 255, 0.02);
}

.hero-badge i {
  color: var(--color-secondary);
}

.hero-title {
  margin-bottom: var(--spacing-sm);
  color: var(--color-dark);
}

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

.hero-title span.highlight-blue {
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-primary-light) 30%, var(--color-cyan) 50%, var(--color-primary-light) 70%, var(--color-primary) 100%);
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: textShimmer 5s linear infinite;
}

.hero-title span.highlight-gold {
  background: linear-gradient(90deg, var(--color-secondary) 0%, var(--color-secondary-light) 30%, #fff0a0 50%, var(--color-secondary-light) 70%, var(--color-secondary) 100%);
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: textShimmer 6s linear infinite;
  font-family: inherit;
}

.hero-desc {
  margin-bottom: var(--spacing-lg);
  color: var(--color-text);
  font-size: 1.2rem;
  line-height: 1.8;
}

.hero-btns {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
}

/* Flowing Wave SVG at bottom of Hero */
.hero-wave-separator {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 120px;
  z-index: 10;
  pointer-events: none;
  overflow: hidden;
}

.hero-wave-separator svg {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  min-width: 1000px;
}

.wave-path-1 {
  fill: var(--color-bg-base);
  opacity: 1;
}

.wave-path-2 {
  fill: rgba(var(--color-primary-rgb), 0.04);
  animation: waveMove 12s linear infinite;
  transform-origin: 50% 100%;
}

.wave-path-3 {
  fill: rgba(var(--color-secondary-rgb), 0.03);
  animation: waveMove 18s linear infinite;
  transform-origin: 50% 100%;
}

@keyframes waveMove {
  0% { transform: translateX(0) scaleY(1); }
  50% { transform: translateX(-25%) scaleY(1.08); }
  100% { transform: translateX(-50%) scaleY(1); }
}

/* Section Block Colors (Rich Segmented Contrast) */
.about {
  background-color: var(--color-bg-gold-tint);
  border-bottom: 1px solid rgba(var(--color-secondary-rgb), 0.12);
}

.capabilities {
  background-color: var(--color-bg-pure);
  border-bottom: 1px solid rgba(var(--color-primary-rgb), 0.08);
}

.lab {
  background-color: var(--color-bg-blue-tint);
  border-bottom: 1px solid rgba(var(--color-primary-rgb), 0.08);
}

.gallery {
  background-color: var(--color-bg-pure);
  border-bottom: 1px solid rgba(var(--color-primary-rgb), 0.04);
}

.contact {
  background-color: var(--color-bg-pure);
}

/* About Section (关于振都) */
.about-grid {
  grid-template-columns: 1fr 1.1fr;
  gap: var(--spacing-xl);
  align-items: center;
}

.about-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.about-image-wrapper {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  width: 90%;
  height: 480px;
  animation: float 6s ease-in-out infinite;
}

.about-image-wrapper::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, transparent 50%, rgba(15, 23, 42, 0.75) 100%);
  z-index: 2;
}

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

.about-image-wrapper:hover img {
  transform: scale(1.05);
}

/* Overlay elements on image wrapper */
.about-visual-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  padding: var(--spacing-md);
  z-index: 3;
  color: #ffffff;
}

.about-visual-tag {
  display: inline-block;
  font-size: 0.75rem;
  background: var(--color-secondary);
  color: #ffffff;
  padding: 2px 8px;
  border-radius: var(--radius-xs);
  margin-bottom: 8px;
  font-weight: 600;
  text-transform: uppercase;
}

.about-visual-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: #ffffff;
  line-height: 1.3;
}

/* Tech Floating Ornament */
.about-ornament {
  position: absolute;
  bottom: -20px;
  right: 0;
  width: 160px;
  height: 160px;
  z-index: 4;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.8);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: var(--spacing-sm);
  box-shadow: var(--shadow-lg);
}

.about-ornament .value {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
  font-family: 'Outfit', sans-serif;
  margin-bottom: 4px;
}

.about-ornament .label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

.about-text {
  padding-left: var(--spacing-sm);
}

.about-tagline {
  color: var(--color-primary);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 0.5rem;
  display: block;
}

.about-p {
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
  font-size: 1.05rem;
  line-height: 1.75;
  text-align: justify;
}

.about-highlights {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.highlight-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.highlight-icon {
  width: 40px;
  height: 40px;
  background: rgba(var(--color-primary-rgb), 0.08);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  font-size: 1.2rem;
  flex-shrink: 0;
}

.highlight-content h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.highlight-content p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.4;
}

/* Core Capabilities (核心能力) */
.section-header {
  max-width: 650px;
  margin: 0 auto var(--spacing-xl) auto;
}

.section-desc {
  margin-top: 10px;
  color: var(--color-text-muted);
}

.capabilities-grid {
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
}

.capability-card {
  padding: var(--spacing-md) var(--spacing-md) 2.5rem var(--spacing-md);
  border-radius: var(--radius-md);
  position: relative;
  overflow: hidden;
  height: 100%;
  background: radial-gradient(800px circle at var(--mouse-x) var(--mouse-y), rgba(var(--color-primary-rgb), 0.05), transparent 45%), rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.7);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal), background var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.capability-card:hover {
  transform: translateY(-8px);
  background: radial-gradient(800px circle at var(--mouse-x) var(--mouse-y), rgba(var(--color-primary-rgb), 0.1), transparent 45%), rgba(255, 255, 255, 0.95);
  box-shadow: 0 15px 35px -5px rgba(0, 85, 255, 0.08), var(--shadow-premium);
  border-color: rgba(var(--color-primary-rgb), 0.25);
}

.capability-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--color-primary);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

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

/* Special Gold Accent color for specific capabilities */
.capability-card.accent::before {
  background: var(--color-secondary);
}

.capability-icon-box {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-sm);
  background: rgba(var(--color-primary-rgb), 0.05);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  margin-bottom: var(--spacing-md);
  transition: all var(--transition-normal);
}

.capability-card:hover .capability-icon-box {
  background: var(--color-primary);
  color: #ffffff;
  transform: scale(1.05) rotate(5deg);
}

.capability-card.accent:hover .capability-icon-box {
  background: var(--color-secondary);
  color: #ffffff;
}

.capability-card h3 {
  font-size: 1.35rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-dark);
}

.capability-card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

.capability-tag {
  position: absolute;
  bottom: var(--spacing-md);
  right: var(--spacing-md);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-primary-light);
  letter-spacing: 0.5px;
  opacity: 0.4;
  transition: opacity var(--transition-fast);
  text-transform: uppercase;
}

.capability-card:hover .capability-tag {
  opacity: 1;
}

/* Future City Lab (未来城市实验室) */
.lab-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.lab-tabs {
  display: flex;
  justify-content: center;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
  padding: 6px;
  background: rgba(var(--color-primary-rgb), 0.05);
  border: 1px solid rgba(var(--color-primary-rgb), 0.1);
  border-radius: var(--radius-md);
  max-width: 800px;
  margin: 0 auto;
}

.lab-tab-btn {
  padding: 0.8rem 1.6rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: none;
  background: transparent;
  color: var(--color-text);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 8px;
}

.lab-tab-btn:hover {
  color: var(--color-primary);
  background: rgba(255, 255, 255, 0.7);
}

.lab-tab-btn.active {
  background: var(--color-primary);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(var(--color-primary-rgb), 0.25);
}

/* Panels */
.lab-panels {
  position: relative;
  min-height: 480px;
}

.lab-panel {
  display: none;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-normal), transform var(--transition-normal);
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.lab-panel.active {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
  opacity: 1;
  transform: translateY(0);
  position: relative;
}

.lab-panel-visual {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  height: 400px;
}

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

/* UI Overlay simulating an interactive dashboard */
.lab-panel-visual-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(var(--color-primary-rgb), 0.1) 0%, rgba(15, 23, 42, 0.4) 100%);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: var(--spacing-md);
  color: #ffffff;
}

.dashboard-widget {
  align-self: flex-end;
  background: rgba(15, 23, 42, 0.7);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 260px;
  box-shadow: var(--shadow-md);
  animation: widgetFloat 4s ease-in-out infinite alternate;
}

@keyframes widgetFloat {
  0% { transform: translateY(0); }
  100% { transform: translateY(-8px); }
}

.widget-icon {
  width: 32px;
  height: 32px;
  background: var(--color-cyan);
  color: var(--color-dark);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

.widget-text h5 {
  color: #ffffff;
  font-size: 0.85rem;
  margin-bottom: 2px;
}

.widget-text p {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.75rem;
}

.lab-panel-content h3 {
  font-size: 1.85rem;
  margin-bottom: var(--spacing-sm);
  display: flex;
  align-items: center;
  gap: 10px;
}

.lab-panel-content h3 i {
  color: var(--color-primary);
}

.lab-panel-content p {
  margin-bottom: var(--spacing-md);
  font-size: 1rem;
  line-height: 1.7;
}

.lab-features {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-bottom: var(--spacing-md);
}

.lab-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 500;
}

.lab-feature-item i {
  color: var(--color-primary-light);
  font-size: 1.1rem;
}

/* City & Culture Gallery (城市与文化影像馆) */
.gallery-grid {
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
}

.gallery-item {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  height: 350px;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

.gallery-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, rgba(15, 23, 42, 0) 40%, rgba(15, 23, 42, 0.85) 100%);
  z-index: 2;
  transition: opacity var(--transition-normal);
}

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

.gallery-item-info {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  padding: var(--spacing-md);
  z-index: 3;
  color: #ffffff;
  transform: translateY(10px);
  transition: transform var(--transition-normal);
}

.gallery-item-cat {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-secondary-light);
  text-transform: uppercase;
  margin-bottom: 4px;
}

.gallery-item-title {
  font-size: 1.25rem;
  color: #ffffff;
  font-weight: 700;
}

.gallery-item-desc {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.7);
  margin-top: 5px;
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  transition: opacity var(--transition-normal), max-height var(--transition-normal);
}

/* Gallery hover effects */
.gallery-item:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-5px);
}

.gallery-item:hover img {
  transform: scale(1.06);
}

.gallery-item:hover .gallery-item-info {
  transform: translateY(0);
}

.gallery-item:hover .gallery-item-desc {
  opacity: 1;
  max-height: 80px;
}

/* Lightbox Modal (Full Screen Viewer) */
.lightbox-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(12px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.lightbox-modal.active {
  opacity: 1;
  pointer-events: auto;
}

.lightbox-close {
  position: absolute;
  top: 30px;
  right: 30px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-full);
  color: #ffffff;
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.lightbox-close:hover {
  background: var(--color-red);
  border-color: var(--color-red);
  transform: rotate(90deg);
}

.lightbox-content {
  max-width: 85%;
  max-height: 80vh;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 15px;
}

.lightbox-img {
  max-width: 100%;
  max-height: 70vh;
  border-radius: var(--radius-sm);
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
  transform: scale(0.95);
  transition: transform var(--transition-normal);
}

.lightbox-modal.active .lightbox-img {
  transform: scale(1);
}

.lightbox-caption {
  color: #ffffff;
  text-align: center;
}

.lightbox-caption h4 {
  color: #ffffff;
  font-size: 1.4rem;
  margin-bottom: 4px;
}

.lightbox-caption p {
  color: var(--color-text-light);
  font-size: 0.95rem;
}

/* Canal Culture Special (运河文化专题) */
.canal-special {
  background: linear-gradient(180deg, var(--color-bg-pure) 0%, var(--color-bg-gold-tint) 100%);
  border-top: 1px solid rgba(var(--color-secondary-rgb), 0.1);
  border-bottom: 1px solid rgba(var(--color-secondary-rgb), 0.1);
  overflow: hidden;
}

.canal-container {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: var(--spacing-xl);
  align-items: center;
}

.canal-content {
  position: relative;
  z-index: 5;
}

.canal-water-accent {
  position: absolute;
  top: -10%;
  left: -20%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(var(--color-secondary-rgb), 0.05) 0%, transparent 60%);
  pointer-events: none;
  z-index: -1;
}

.canal-visual {
  position: relative;
  display: flex;
  justify-content: flex-end;
}

.canal-frame {
  position: relative;
  width: 90%;
  height: 460px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 4px solid var(--color-bg-pure);
}

.canal-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.canal-narrative-card {
  position: absolute;
  bottom: -30px;
  left: -40px;
  width: 280px;
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  border: 1px solid rgba(var(--color-secondary-rgb), 0.15);
  background: rgba(255, 255, 255, 0.95);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(8px);
}

.canal-narrative-card i {
  color: var(--color-secondary);
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.canal-narrative-card h4 {
  font-size: 1.1rem;
  margin-bottom: 4px;
}

.canal-narrative-card p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* Contact Us (联系我们) */
.contact-grid {
  grid-template-columns: 1.1fr 1fr;
  gap: var(--spacing-xl);
}

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

.contact-card {
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.contact-card-icon {
  width: 50px;
  height: 50px;
  background: rgba(var(--color-primary-rgb), 0.06);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  font-size: 1.3rem;
  flex-shrink: 0;
}

.contact-card-text h4 {
  font-size: 1.05rem;
  margin-bottom: 2px;
}

.contact-card-text p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* Custom Styled Map Box representation */
.map-representation {
  margin-top: var(--spacing-sm);
  height: 250px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(var(--color-primary-rgb), 0.1);
  overflow: hidden;
  position: relative;
  background: #f1f5f9;
}

/* Styled map drawing via SVGs and overlay tags */
.map-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0.35;
}

.map-location-tag {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--color-dark);
  color: #ffffff;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 8px;
  box-shadow: var(--shadow-md);
  font-weight: 600;
  font-size: 0.85rem;
  border: 1px solid rgba(255, 255, 255, 0.15);
  animation: mapPin 2s infinite alternate;
}

@keyframes mapPin {
  0% { transform: translate(-50%, -50%) translateY(0); }
  100% { transform: translate(-50%, -50%) translateY(-6px); }
}

.map-location-tag i {
  color: var(--color-secondary);
}

.contact-form-column {
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
}

.form-group-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-sm);
}

.form-group {
  margin-bottom: var(--spacing-sm);
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 6px;
}

.form-control {
  width: 100%;
  padding: 0.8rem 1rem;
  border-radius: var(--radius-xs);
  border: 1px solid rgba(15, 23, 42, 0.12);
  background: var(--color-bg-pure);
  color: var(--color-dark);
  font-family: inherit;
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(var(--color-primary-rgb), 0.12);
}

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

/* Footer (页脚) */
footer {
  background-color: var(--color-dark);
  color: #ffffff;
  padding: var(--spacing-lg) 0 var(--spacing-md) 0;
  position: relative;
  z-index: 5;
}

.footer-grid {
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--spacing-lg);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding-bottom: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.footer-info {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.footer-info .logo .logo-cn {
  color: #ffffff;
}

.footer-info .logo .logo-en {
  color: var(--color-text-light);
}

.footer-info p {
  color: var(--color-text-light);
  font-size: 0.9rem;
  line-height: 1.6;
}

.footer-socials {
  display: flex;
  gap: 10px;
}

.footer-social-btn {
  width: 36px;
  height: 36px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-light);
  transition: all var(--transition-fast);
}

.footer-social-btn:hover {
  background: var(--color-primary);
  color: #ffffff;
  transform: translateY(-2px);
}

.footer-links-col h4 {
  color: #ffffff;
  font-size: 1.05rem;
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
  position: relative;
  display: inline-block;
}

.footer-links-col h4::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--color-secondary);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 15px;
}

.footer-link a {
  color: var(--color-text-light);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

.footer-link a:hover {
  color: #ffffff;
  padding-left: 4px;
}

.footer-contact-info {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 15px;
  color: var(--color-text-light);
  font-size: 0.9rem;
}

.footer-contact-info li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.footer-contact-info li i {
  color: var(--color-secondary);
  margin-top: 3px;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--color-text-light);
}

.footer-legal-links {
  display: flex;
  gap: var(--spacing-sm);
}

.footer-legal-links a {
  color: var(--color-text-light);
}

.footer-legal-links a:hover {
  color: #ffffff;
}

/* Apple-style Scroll Reveal System */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

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

.reveal-delay-1 { transition-delay: 0.15s; }
.reveal-delay-2 { transition-delay: 0.3s; }
.reveal-delay-3 { transition-delay: 0.45s; }

/* Responsive Media Queries */
@media (max-width: 1024px) {
  :root {
    --spacing-xl: 4rem;
    --spacing-xxl: 5rem;
  }
  
  .about-grid, .contact-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .about-image-wrapper {
    width: 100%;
    height: 400px;
  }
  
  .capabilities-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .lab-panel.active {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .lab-panels {
    min-height: auto;
  }
  
  .lab-panel-visual {
    height: 300px;
  }
  
  .canal-container {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .canal-visual {
    justify-content: center;
  }
  
  .canal-frame {
    width: 100%;
    height: 380px;
  }
  
  .canal-narrative-card {
    left: 20px;
  }
  
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
  }
}

@media (max-width: 768px) {
  header.scrolled {
    height: 60px;
  }
  
  .menu-toggle {
    display: block;
    z-index: 1100;
  }
  
  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 320px;
    height: 100vh;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(16px);
    flex-direction: column;
    justify-content: center;
    padding: var(--spacing-lg) var(--spacing-md);
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.05);
    transition: right var(--transition-normal);
    z-index: 1050;
  }
  
  .nav-menu.active {
    right: 0;
  }
  
  /* Menu Hamburger Animation */
  .menu-toggle.active .menu-bar:nth-child(1) {
    transform: translateY(10px) rotate(45deg);
  }
  
  .menu-toggle.active .menu-bar:nth-child(2) {
    opacity: 0;
  }
  
  .menu-toggle.active .menu-bar:nth-child(3) {
    transform: translateY(-10px) rotate(-45deg);
  }
  
  .hero-content {
    text-align: center;
    margin-top: 100px;
  }
  
  .hero-badge {
    margin: 0 auto var(--spacing-md) auto;
  }
  
  .hero-btns {
    justify-content: center;
    flex-direction: column;
    width: 100%;
    gap: var(--spacing-xs);
  }
  
  .hero-btns .btn {
    width: 100%;
  }
  
  .capabilities-grid, .gallery-grid {
    grid-template-columns: 1fr;
  }
  
  .about-highlights {
    grid-template-columns: 1fr;
  }
  
  .form-group-row {
    grid-template-columns: 1fr;
    gap: 0;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: 15px;
    text-align: center;
  }
}