/* ============================================
   CSS Variables & Reset
   ============================================ */
:root {
  --primary: #00d4ff;
  --primary-dark: #009dcc;
  --secondary: #7c3aed;
  --secondary-light: #a855f7;
  --accent: #f59e0b;
  --bg-dark: #0a0e1a;
  --bg-card: #111827;
  --bg-card-hover: #1a2332;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border-color: rgba(0, 212, 255, 0.1);
  --glass-bg: rgba(10, 14, 26, 0.85);
  --glass-border: rgba(0, 212, 255, 0.15);
  --nav-height: 72px;
  --max-width: 1200px;
  --gradient-main: linear-gradient(135deg, var(--primary), var(--secondary));
  --gradient-glow: linear-gradient(135deg, rgba(0,212,255,0.15), rgba(124,58,237,0.15));
  --shadow-glow: 0 0 40px rgba(0, 212, 255, 0.15);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-sc: 'Noto Sans SC', 'Noto Sans HK', var(--font-sans);
  --font-tw: 'Noto Sans HK', 'Noto Sans SC', var(--font-sans);
}

[data-lang="zh-CN"] body { font-family: var(--font-sc); }
[data-lang="zh-TW"] body { font-family: var(--font-tw); }
[data-lang="en"] body { font-family: var(--font-sans); }

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
  scroll-snap-type: y mandatory;
}
body {
  scroll-snap-type: y mandatory;
}
#hero,
.section,
footer {
  scroll-snap-align: start;
  scroll-snap-stop: always;
}

body {
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  background-image: radial-gradient(rgba(0,212,255,0.03) 1px, transparent 1px);
  background-size: 40px 40px;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea { font-family: inherit; outline: none; }
::selection { background: var(--primary); color: var(--bg-dark); }
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 3px; }

/* ============================================
   Navigation
   ============================================ */
#navbar {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--nav-height);
  z-index: 1000;
  background: transparent;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
#navbar.scrolled {
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(1.5);
  -webkit-backdrop-filter: blur(20px) saturate(1.5);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: 0 4px 30px rgba(0,0,0,0.3);
}
.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.5px;
  position: relative;
  z-index: 1001;
}
.logo-icon { flex-shrink: 0; }
.logo-text {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-link {
  padding: 8px 18px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: 8px;
  transition: all 0.3s;
  position: relative;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: 2px; left: 50%;
  width: 0; height: 2px;
  background: var(--gradient-main);
  border-radius: 1px;
  transition: all 0.3s;
  transform: translateX(-50%);
}
.nav-link:hover,
.nav-link.active { color: var(--text-primary); }
.nav-link:hover::after,
.nav-link.active::after { width: 60%; }

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}
.lang-switch {
  display: flex;
  background: rgba(255,255,255,0.05);
  border-radius: 8px;
  padding: 2px;
  border: 1px solid var(--glass-border);
}
.lang-btn {
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  border-radius: 6px;
  transition: all 0.3s;
  min-width: 32px;
  text-align: center;
}
.lang-btn.active {
  background: var(--gradient-main);
  color: #fff;
  box-shadow: 0 2px 10px rgba(0,212,255,0.3);
}
.lang-btn:hover:not(.active) { color: var(--text-primary); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
  z-index: 1001;
}
.nav-toggle span {
  display: block;
  width: 24px; height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all 0.3s;
}
.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); }

/* ============================================
   Hero Section
   ============================================ */
#hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
#particles-js {
  position: absolute; inset: 0;
  z-index: 1;
}
#three-container {
  position: absolute; inset: 0;
  z-index: 0;
  opacity: 0.5;
}
.hero-overlay {
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at center, transparent 0%, var(--bg-dark) 70%);
  z-index: 2;
}
.hero-floating {
  position: absolute;
  inset: 0;
  z-index: 3;
  pointer-events: none;
  overflow: hidden;
}
.hf-item {
  position: absolute;
  width: 44px; height: 44px;
  background: rgba(0,212,255,0.06);
  border: 1px solid rgba(0,212,255,0.1);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: rgba(0,212,255,0.25);
  animation: hf-float 20s ease-in-out infinite;
}
.hf-1 { top: 18%; left: 8%; animation-delay: 0s; }
.hf-2 { top: 25%; right: 12%; animation-delay: -4s; }
.hf-3 { bottom: 30%; left: 15%; animation-delay: -8s; }
.hf-4 { bottom: 20%; right: 8%; animation-delay: -12s; }
.hf-5 { top: 50%; left: 5%; animation-delay: -16s; }
@keyframes hf-float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  25% { transform: translateY(-20px) rotate(5deg); }
  50% { transform: translateY(-8px) rotate(-3deg); }
  75% { transform: translateY(-28px) rotate(2deg); }
}
.hero-content {
  position: relative;
  z-index: 3;
  text-align: center;
  max-width: 800px;
  padding: 0 24px;
  margin-top: -40px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: rgba(0,212,255,0.1);
  border: 1px solid rgba(0,212,255,0.2);
  border-radius: 50px;
  font-size: 13px;
  font-weight: 500;
  color: var(--primary);
  margin-bottom: 28px;
  backdrop-filter: blur(10px);
}
.hero-badge i { font-size: 14px; }
.hero-title {
  margin-bottom: 24px;
}
.hero-subtitle {
  display: block;
  font-size: 18px;
  font-weight: 400;
  color: var(--text-secondary);
  letter-spacing: 4px;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.hero-main {
  display: block;
  min-height: 1.2em;
  font-size: clamp(36px, 6vw, 72px);
  font-weight: 900;
  line-height: 1.1;
}
.hero-typed-wrapper {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative;
  will-change: transform;
  transform: translateZ(0);
}
.hero-typed-text {
  -webkit-text-fill-color: transparent;
}
.typed-cursor {
  font-size: clamp(36px, 6vw, 72px);
  color: var(--primary);
  -webkit-text-fill-color: var(--primary);
  will-change: opacity;
}
.typed-fade-out {
  opacity: 0;
  transition: opacity 0.3s ease;
}
.hero-desc {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 40px;
  line-height: 1.8;
}
.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}
.hero-stats {
  margin-top: 40px;
  padding: 12px 28px;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 50px;
  display: inline-block;
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 1.5px;
  backdrop-filter: blur(4px);
  text-align: center;
}
.hero-stats span {
  display: inline-flex;
  gap: 4px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  background: var(--gradient-main);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  border-radius: 12px;
  transition: all 0.3s;
  box-shadow: 0 4px 20px rgba(0,212,255,0.25);
  position: relative;
  overflow: hidden;
}
.btn-primary::before {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.1), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}
.btn-primary:hover::before { opacity: 1; }
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0,212,255,0.35);
}
.btn-primary i {
  transition: transform 0.3s;
  font-size: 14px;
}
.btn-primary:hover i { transform: translateX(4px); }

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: transparent;
  color: var(--text-primary);
  font-size: 15px;
  font-weight: 600;
  border-radius: 12px;
  border: 1px solid var(--glass-border);
  transition: all 0.3s;
}
.btn-outline:hover {
  border-color: var(--primary);
  background: rgba(0,212,255,0.05);
  box-shadow: 0 0 30px rgba(0,212,255,0.1);
}

.scroll-indicator {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  animation: bounce-down 2s ease-in-out infinite;
}
.scroll-mouse {
  width: 24px; height: 38px;
  border: 2px solid var(--text-muted);
  border-radius: 12px;
  display: flex;
  justify-content: center;
  padding-top: 8px;
}
.scroll-wheel {
  width: 3px; height: 8px;
  background: var(--primary);
  border-radius: 2px;
  animation: scroll-wheel 2s ease-in-out infinite;
}
@keyframes scroll-wheel {
  0%, 100% { transform: translateY(0); opacity: 1; }
  50% { transform: translateY(8px); opacity: 0.3; }
}
@keyframes bounce-down {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(6px); }
}

/* ============================================
   Section Common
   ============================================ */
.section {
  position: relative;
  padding: 100px 0;
}
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 2;
}
.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 60px;
}
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 18px;
  background: rgba(0,212,255,0.08);
  border: 1px solid rgba(0,212,255,0.15);
  border-radius: 50px;
  font-size: 12px;
  font-weight: 600;
  color: var(--primary);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.section-tag::before {
  content: '';
  width: 5px;
  height: 5px;
  background: var(--primary);
  border-radius: 50%;
  animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.6); }
}
.section-title {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 800;
  margin-bottom: 24px;
  line-height: 1.2;
  text-align: center;
}
.section-title::after {
  content: '';
  display: block;
  margin: 12px auto 0;
  width: 64px;
  height: 3px;
  background: var(--gradient-main);
  border-radius: 2px;
}
.section-desc {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.8;
}
.section-note {
  max-width: 680px;
  margin: 14px auto 0;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.9;
}

/* ============================================
   About Section
   ============================================ */
#about {
  background: linear-gradient(180deg, var(--bg-dark) 0%, #0d1225 100%);
}
.section-bg {
  position: absolute; inset: 0;
  background: radial-gradient(circle at 20% 50%, rgba(0,212,255,0.03) 0%, transparent 50%),
              radial-gradient(circle at 80% 50%, rgba(124,58,237,0.03) 0%, transparent 50%);
  pointer-events: none;
}
#about::before, #about::after,
#technology::before,
#stats::before,
#advantages::before {
  content: '';
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
}
#about::before {
  width: 300px; height: 300px;
  background: radial-gradient(circle, rgba(0,212,255,0.04), transparent);
  top: -80px; right: -80px;
  animation: float-drift 12s ease-in-out infinite;
}
#about::after {
  width: 200px; height: 200px;
  background: radial-gradient(circle, rgba(124,58,237,0.04), transparent);
  bottom: -40px; left: -60px;
  animation: float-drift 15s ease-in-out infinite reverse;
}
#technology::before {
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(0,212,255,0.03), transparent);
  top: -100px; left: -100px;
  animation: float-drift 18s ease-in-out infinite;
}
#stats::before {
  width: 250px; height: 250px;
  background: radial-gradient(circle, rgba(124,58,237,0.04), transparent);
  top: -50px; right: -50px;
  animation: float-drift 14s ease-in-out infinite reverse;
}
#advantages::before {
  width: 350px; height: 350px;
  background: radial-gradient(circle, rgba(0,212,255,0.03), transparent);
  bottom: -100px; left: -80px;
  animation: float-drift 16s ease-in-out infinite;
}
@keyframes float-drift {
  0%, 100% { transform: translate(0, 0); }
  33% { transform: translate(30px, -30px); }
  66% { transform: translate(-20px, 20px); }
}
.about-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.about-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 36px 28px;
  transition: transform 0.4s, border-color 0.4s, box-shadow 0.4s, background 0.4s;
  position: relative;
  overflow: hidden;
}
.about-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--gradient-main);
  opacity: 0;
  transition: opacity 0.4s;
}
.about-card:hover::before { opacity: 1; }
.about-card:hover {
  transform: translateY(-8px);
  border-color: rgba(0,212,255,0.2);
  box-shadow: 0 20px 60px rgba(0,0,0,0.3), var(--shadow-glow);
  background: var(--bg-card-hover);
}
.about-icon {
  width: 56px; height: 56px;
  background: var(--gradient-glow);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 24px;
  color: var(--primary);
  transition: all 0.4s;
}
.about-card:hover .about-icon {
  background: var(--gradient-main);
  color: #fff;
  transform: scale(1.05);
}
.about-tag {
  display: inline-block;
  font-size: 10px;
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 4px;
  opacity: 0.6;
}
.about-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}
.about-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ============================================
   Business Section - 3D Flip Cards
   ============================================ */
#business {
  background: linear-gradient(0deg, var(--bg-dark) 0%, #0d1225 100%);
}
.business-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  perspective: 1200px;
}
.business-card {
  height: 380px;
  perspective: 1200px;
}
.card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
  transform-style: preserve-3d;
}
.business-card:hover .card-inner {
  transform: rotateY(180deg);
}
.card-front, .card-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: 20px;
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  border: 1px solid var(--border-color);
  overflow: hidden;
}
.card-front {
  background: linear-gradient(145deg, var(--bg-card), #141e30);
}
.card-front::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--primary), transparent);
  opacity: 0.3;
}
.card-front::after {
  content: '';
  position: absolute;
  inset: -40%;
  background: linear-gradient(120deg, transparent 35%, rgba(255,255,255,0.14) 50%, transparent 65%);
  transform: translateX(-80%) rotate(10deg);
  transition: transform 0.7s ease;
  pointer-events: none;
}
.business-card:hover .card-front::after {
  transform: translateX(80%) rotate(10deg);
}
.card-icon {
  position: relative;
  z-index: 1;
  width: 72px; height: 72px;
  background: var(--gradient-glow);
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 30px;
  color: var(--primary);
  margin-bottom: 20px;
  transition: all 0.3s;
}
.business-card:hover .card-icon {
  background: var(--gradient-main);
  color: #fff;
  transform: scale(1.1);
}
.card-front h3 {
  position: relative;
  z-index: 1;
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}
.card-front p {
  position: relative;
  z-index: 1;
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 1px;
}
.card-excerpt {
  margin-top: 12px;
  font-size: 11px;
  color: var(--primary) !important;
  letter-spacing: 0.5px;
  opacity: 0.7;
  font-weight: 500;
}
.card-back {
  background: linear-gradient(145deg, #0f1a2e, var(--bg-card));
  transform: rotateY(180deg);
  text-align: left;
  align-items: flex-start;
  justify-content: flex-start;
  padding-top: 40px;
}
.card-back::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 20px;
  padding: 1px;
  background: var(--gradient-main);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}
.card-back h4 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.card-back p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}
.card-back ul {
  width: 100%;
}
.card-back ul li {
  padding: 6px 0;
  font-size: 13px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}
.card-back ul li::before {
  content: '▸';
  color: var(--primary);
  font-weight: 700;
}

/* ============================================
   Technology Section
   ============================================ */
#technology {
  background: linear-gradient(180deg, #0d1225, var(--bg-dark));
  overflow: hidden;
}
.tech-bg-lines {
  position: absolute; inset: 0;
  background:
    repeating-linear-gradient(90deg, transparent, transparent 59px, rgba(0,212,255,0.015) 59px, rgba(0,212,255,0.015) 60px);
  pointer-events: none;
}
.tech-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}
.tech-item {
  text-align: center;
  padding: 24px;
  transform-style: preserve-3d;
}
.tech-ring {
  position: relative;
  width: 160px; height: 160px;
  margin: 0 auto 20px;
}
.tech-ring svg {
  transform: rotate(-90deg);
  width: 100%; height: 100%;
}
.ring-bg {
  fill: none;
  stroke: rgba(255,255,255,0.05);
  stroke-width: 6;
}
.ring-progress {
  fill: none;
  stroke-width: 6;
  stroke-linecap: round;
  transition: stroke-dashoffset 1.5s cubic-bezier(0.4, 0, 0.2, 1);
  filter: drop-shadow(0 0 8px rgba(0,212,255,0.35));
}

.tech-ring-icon {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 36px;
  color: var(--primary);
}
.tech-item h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}
.tech-short {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 10px;
}
.tech-long {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.8;
  margin-top: 8px;
  padding: 0 4px;
  border-top: 1px solid rgba(255,255,255,0.04);
  padding-top: 10px;
}

/* ============================================
   Stats Section
   ============================================ */
#stats {
  background: linear-gradient(135deg, #0d1225 0%, var(--bg-dark) 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
}
.stats-bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(0,212,255,0.06) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(124,58,237,0.06) 0%, transparent 50%);
  pointer-events: none;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.stat-item {
  text-align: center;
  padding: 40px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  transition: all 0.4s;
  position: relative;
  overflow: hidden;
}
.stat-item::before {
  content: '';
  position: absolute;
  bottom: 0; left: 50%;
  width: 0; height: 3px;
  background: var(--gradient-main);
  transition: all 0.4s;
  transform: translateX(-50%);
}
.stat-item:hover::before { width: 80%; }
.stat-item:hover {
  transform: translateY(-8px);
  border-color: rgba(0,212,255,0.2);
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}
.stat-number {
  font-size: clamp(30px, 4vw, 52px);
  font-weight: 900;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
  line-height: 1;
  word-break: keep-all;
}
.stat-plus { font-size: 28px; }
.stat-label {
  font-size: 15px;
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: 6px;
}
.stat-desc {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.6;
  max-width: 200px;
  margin: 0 auto;
}

/* ============================================
   Advantages Section
   ============================================ */
#advantages {
  background: linear-gradient(180deg, var(--bg-dark), #0d1225);
  min-height: 100vh;
  display: block;
}
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.adv-card {
  position: relative;
  background: linear-gradient(145deg, var(--bg-card), #141e30);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 28px 24px;
  text-align: center;
  overflow: hidden;
  transition: all 0.4s;
}
.adv-glow {
  position: absolute;
  top: -50%; left: -50%;
  width: 100%; height: 100%;
  background: radial-gradient(circle, rgba(0,212,255,0.06), transparent 70%);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.4s;
}
.adv-card:hover .adv-glow {
  opacity: 1;
}
.adv-card:hover {
  transform: translateY(-6px);
  border-color: rgba(0,212,255,0.2);
  box-shadow: 0 20px 50px rgba(0,0,0,0.3);
}
.adv-icon {
  width: 60px; height: 60px;
  margin: 0 auto 14px;
  background: var(--gradient-glow);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  color: var(--primary);
  transition: all 0.4s;
  position: relative;
  z-index: 1;
}
.adv-card:hover .adv-icon {
  background: var(--gradient-main);
  color: #fff;
  transform: scale(1.1) rotate(5deg);
}
.adv-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
  position: relative;
  z-index: 1;
}
.adv-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  position: relative;
  z-index: 1;
}

/* ============================================
   Contact Section
   ============================================ */
#contact {
  background: linear-gradient(0deg, #0d1225, var(--bg-dark));
}
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
.contact-info {
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.info-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  transition: all 0.3s;
}
.info-item:hover {
  border-color: rgba(0,212,255,0.2);
  transform: translateX(4px);
}
.info-icon {
  width: 48px; height: 48px;
  min-width: 48px;
  background: var(--gradient-glow);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: var(--primary);
}
.info-item h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 4px;
}
.info-item p,
.info-item a {
  font-size: 14px;
  color: var(--text-primary);
}
.info-item a:hover { color: var(--primary); }

.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 40px;
}
.form-group {
  position: relative;
  margin-bottom: 28px;
  display: flex;
  flex-direction: column;
}
.form-group label {
  display: block;
  position: static;
  order: 1;
  margin-bottom: 6px;
  font-size: 13px;
  color: var(--text-muted);
  transition: color 0.3s;
  pointer-events: none;
}
.form-group input,
.form-group textarea {
  order: 2;
  width: 100%;
  padding: 4px 0 8px;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 15px;
  transition: all 0.3s;
  resize: vertical;
}
.form-group textarea { min-height: 100px; }
.form-group:focus-within label {
  color: var(--primary);
}
.form-line {
  order: 3;
  position: absolute;
  bottom: 0; left: 0;
  width: 100%; height: 1px;
  background: var(--border-color);
}
.form-line::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 0; height: 1px;
  background: var(--gradient-main);
  transition: width 0.3s;
}
.form-group input:focus ~ .form-line::after,
.form-group textarea:focus ~ .form-line::after {
  width: 100%;
}
.btn-submit {
  width: 100%;
  justify-content: center;
  padding: 16px;
  font-size: 16px;
}

/* ============================================
   Footer
   ============================================ */
footer {
  border-top: 1px solid var(--border-color);
  background: #080c16;
  min-height: 38vh;
}
.footer-top {
  padding: 60px 0 40px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 800;
  margin-bottom: 16px;
  color: var(--text-primary);
}
.footer-brand p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 20px;
  max-width: 320px;
}
.footer-social {
  display: flex;
  gap: 12px;
}
.footer-social a {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: rgba(255,255,255,0.05);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: all 0.3s;
  font-size: 15px;
}
.footer-social a:hover {
  background: var(--gradient-main);
  color: #fff;
  transform: translateY(-3px);
}
.footer-links h4 {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 20px;
}
.footer-links ul li { margin-bottom: 10px; }
.footer-links ul li a {
  font-size: 13px;
  color: var(--text-muted);
  transition: color 0.3s;
}
.footer-links ul li a:hover { color: var(--primary); }

.footer-bottom {
  padding: 20px 0;
  border-top: 1px solid var(--border-color);
  text-align: center;
}
.footer-bottom p {
  font-size: 12px;
  color: var(--text-muted);
}
.footer-reg {
  margin-top: 4px;
  font-size: 11px;
  color: var(--text-muted);
  opacity: 0.7;
  letter-spacing: 1px;
}

/* ============================================
   English Layout Tightening
   ============================================ */
@media (min-width: 769px) {
  [data-lang="en"] .hero-content {
    max-width: 900px;
    margin-top: -24px;
  }
  [data-lang="en"] .hero-badge {
    margin-bottom: 20px;
  }
  [data-lang="en"] .hero-subtitle {
    font-size: 15px;
    letter-spacing: 2px;
    margin-bottom: 12px;
  }
  [data-lang="en"] .hero-main,
  [data-lang="en"] .typed-cursor {
    font-size: clamp(34px, 4.4vw, 56px);
    line-height: 1.08;
  }
  [data-lang="en"] .hero-title {
    margin-bottom: 18px;
  }
  [data-lang="en"] .hero-desc {
    max-width: 760px;
    margin-bottom: 28px;
    font-size: 15px;
    line-height: 1.55;
  }
  [data-lang="en"] .hero-stats {
    margin-top: 28px;
    letter-spacing: 0.5px;
  }

  [data-lang="en"] .section {
    padding: 72px 0;
  }
  [data-lang="en"] .section-header {
    max-width: 880px;
    margin-bottom: 34px;
  }
  [data-lang="en"] .section-tag {
    margin-bottom: 12px;
  }
  [data-lang="en"] .section-title {
    font-size: clamp(24px, 3vw, 34px);
    margin-bottom: 16px;
  }
  [data-lang="en"] .section-title::after {
    margin-top: 10px;
  }
  [data-lang="en"] .section-desc {
    font-size: 14px;
    line-height: 1.55;
  }
  [data-lang="en"] .section-note {
    max-width: 760px;
    margin-top: 10px;
    font-size: 13px;
    line-height: 1.55;
  }

  [data-lang="en"] .about-grid,
  [data-lang="en"] .business-grid,
  [data-lang="en"] .tech-grid,
  [data-lang="en"] .stats-grid,
  [data-lang="en"] .advantages-grid {
    gap: 18px;
  }
  [data-lang="en"] .about-card {
    padding: 26px 22px;
  }
  [data-lang="en"] .about-card h3 {
    font-size: 18px;
    margin-bottom: 8px;
  }
  [data-lang="en"] .about-card p {
    font-size: 13px;
    line-height: 1.55;
  }
  [data-lang="en"] .about-icon {
    margin-bottom: 14px;
  }

  [data-lang="en"] .business-card {
    height: 320px;
  }
  [data-lang="en"] .card-front,
  [data-lang="en"] .card-back {
    padding: 24px 18px;
  }
  [data-lang="en"] .card-back {
    padding-top: 28px;
  }
  [data-lang="en"] .card-icon {
    width: 62px;
    height: 62px;
    margin-bottom: 14px;
    font-size: 26px;
  }
  [data-lang="en"] .card-front h3,
  [data-lang="en"] .card-back h4 {
    font-size: 16px;
    margin-bottom: 8px;
  }
  [data-lang="en"] .card-back p {
    font-size: 12px;
    line-height: 1.45;
    margin-bottom: 10px;
  }
  [data-lang="en"] .card-back ul li {
    padding: 4px 0;
    font-size: 12px;
    line-height: 1.35;
  }

  [data-lang="en"] .tech-item {
    padding: 14px;
  }
  [data-lang="en"] .tech-ring {
    width: 120px;
    height: 120px;
    margin-bottom: 14px;
  }
  [data-lang="en"] .tech-ring-icon {
    font-size: 28px;
  }
  [data-lang="en"] .tech-item h3 {
    font-size: 16px;
    margin-bottom: 6px;
  }
  [data-lang="en"] .tech-short {
    font-size: 12px;
    line-height: 1.45;
    margin-bottom: 8px;
  }
  [data-lang="en"] .tech-long {
    display: -webkit-box;
    -webkit-line-clamp: 5;
    -webkit-box-orient: vertical;
    overflow: hidden;
    font-size: 11px;
    line-height: 1.45;
  }

  [data-lang="en"] .stat-item {
    padding: 32px 18px;
  }
  [data-lang="en"] .stat-label {
    font-size: 14px;
  }
  [data-lang="en"] .stat-desc {
    font-size: 11px;
    line-height: 1.45;
  }

  [data-lang="en"] .advantages-grid {
    gap: 16px;
  }
  [data-lang="en"] .adv-card {
    padding: 22px 20px;
  }
  [data-lang="en"] .adv-icon {
    width: 52px;
    height: 52px;
    margin-bottom: 10px;
    font-size: 21px;
  }
  [data-lang="en"] .adv-card h3 {
    font-size: 16px;
    margin-bottom: 6px;
  }
  [data-lang="en"] .adv-card p {
    font-size: 12px;
    line-height: 1.45;
  }

  [data-lang="en"] .contact-grid {
    gap: 32px;
  }
  [data-lang="en"] .contact-info {
    gap: 16px;
  }
  [data-lang="en"] .info-item {
    padding: 16px;
  }
  [data-lang="en"] .contact-form {
    padding: 28px;
  }
  [data-lang="en"] .form-group {
    margin-bottom: 22px;
  }
  [data-lang="en"] .form-group textarea {
    min-height: 76px;
  }
  [data-lang="en"] .btn-submit {
    padding: 14px;
  }
}

/* ============================================
   Section Indicator
   ============================================ */
.section-indicator {
  position: fixed;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 998;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 12px 6px;
  background: rgba(255,255,255,0.03);
  backdrop-filter: blur(8px);
  border-radius: 20px;
  border: 1px solid rgba(255,255,255,0.06);
}
.indicator-dot {
  position: relative;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255,255,255,0.15);
  transition: all 0.4s;
  display: block;
}
.indicator-dot.active {
  background: var(--primary);
  box-shadow: 0 0 12px rgba(0,212,255,0.4);
  transform: scale(1.3);
}
.indicator-dot:hover {
  background: rgba(0,212,255,0.5);
  transform: scale(1.2);
}
.dot-tooltip {
  position: absolute;
  right: calc(100% + 12px);
  top: 50%;
  transform: translateY(-50%);
  background: rgba(0,0,0,0.8);
  backdrop-filter: blur(4px);
  color: #fff;
  font-size: 11px;
  padding: 4px 10px;
  border-radius: 6px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
  font-weight: 500;
  letter-spacing: 0.5px;
}
.indicator-dot:hover .dot-tooltip {
  opacity: 1;
}

/* ============================================
   Scroll to Top
   ============================================ */
#scrollTop {
  position: fixed;
  bottom: 30px; right: 30px;
  width: 44px; height: 44px;
  border-radius: 12px;
  background: var(--gradient-main);
  color: #fff;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.4s;
  box-shadow: 0 4px 20px rgba(0,212,255,0.3);
}
#scrollTop.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
#scrollTop:hover { transform: translateY(-3px); }

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
  .business-grid { grid-template-columns: repeat(2, 1fr); }
  .advantages-grid { grid-template-columns: repeat(2, 1fr); }
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  html,
  body {
    scroll-snap-type: y proximity;
    scroll-snap-stop: normal;
  }
  body {
    background-image: none;
    touch-action: pan-y;
  }
  #navbar.scrolled { background: var(--glass-bg); }
  .nav-menu {
    position: fixed;
    top: 0; right: -100%;
    width: 280px; height: 100vh;
    background: rgba(10,14,26,0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    gap: 8px;
    transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border-left: 1px solid var(--glass-border);
    padding: 80px 32px;
  }
  .nav-menu.active { right: 0; }
  .nav-link { font-size: 18px; padding: 12px 20px; }
  .nav-toggle { display: flex; }
  .lang-btn { padding: 3px 8px; font-size: 11px; min-width: 28px; }
  #hero,
  .section,
  footer {
    scroll-snap-stop: normal;
  }
  .section {
    padding: 70px 0;
    content-visibility: auto;
    contain: layout style paint;
  }
  footer {
    content-visibility: auto;
    contain: layout style paint;
  }
  .section-indicator { display: none; }
  .hero-typed-wrapper {
    will-change: auto;
    transform: none;
  }
  .tech-item {
    transform-style: flat;
  }
  .hero-stats { font-size: 10px; padding: 8px 16px; letter-spacing: 1px; }
  .hf-item { width: 32px; height: 32px; font-size: 13px; }
  .hf-1, .hf-3, .hf-5 { display: none; }
  .about-grid { grid-template-columns: 1fr; }
  .business-grid { grid-template-columns: 1fr; }
  .business-card { height: 340px; }
  .advantages-grid { grid-template-columns: 1fr; }
  .tech-grid { grid-template-columns: 1fr; }
  .tech-ring { width: 140px; height: 140px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-desc { font-size: 11px; max-width: 160px; }
  .contact-form { padding: 24px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-brand p { max-width: 100%; }

  /* Mobile: simplify AOS 3D animations to simple fade-up */
  body.aos-active [data-aos="neon-slide-right"],
  body.aos-active [data-aos="neon-slide-left"],
  body.aos-active [data-aos="neon-slide-up"],
  body.aos-active [data-aos="card-flare"],
  body.aos-active [data-aos="ring-surge"],
  body.aos-active [data-aos="number-spark"],
  body.aos-active [data-aos="panel-lift"] {
    opacity: 0;
    transform: translate3d(0, 20px, 0);
    clip-path: none;
    transition: opacity 0.6s ease, transform 0.6s ease;
  }
  body.aos-active [data-aos="neon-slide-right"].aos-animate,
  body.aos-active [data-aos="neon-slide-left"].aos-animate,
  body.aos-active [data-aos="neon-slide-up"].aos-animate,
  body.aos-active [data-aos="card-flare"].aos-animate,
  body.aos-active [data-aos="ring-surge"].aos-animate,
  body.aos-active [data-aos="number-spark"].aos-animate,
  body.aos-active [data-aos="panel-lift"].aos-animate {
    opacity: 1;
    transform: translate3d(0, 0, 0);
  }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; width: 100%; }
  .btn-primary, .btn-outline { width: 100%; justify-content: center; }
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .stat-item { padding: 24px 16px; }
  .stat-number { font-size: clamp(24px, 8vw, 34px); }
}

/* ============================================
   AOS Custom Overrides
   ============================================ */
[data-aos] {
  pointer-events: none;
}
[data-aos].aos-animate {
  pointer-events: auto;
}
body.aos-active [data-aos="neon-slide-right"],
body.aos-active [data-aos="neon-slide-left"],
body.aos-active [data-aos="neon-slide-up"],
body.aos-active [data-aos="card-flare"],
body.aos-active [data-aos="ring-surge"],
body.aos-active [data-aos="number-spark"],
body.aos-active [data-aos="panel-lift"] {
  opacity: 0;
  transition-property: opacity, transform, clip-path;
}
body.aos-active [data-aos="neon-slide-right"] {
  transform: perspective(1000px) translate3d(-80px, 36px, 0) rotateY(-18deg) scale(0.94);
  transform-origin: left center;
}
body.aos-active [data-aos="neon-slide-left"] {
  transform: perspective(1000px) translate3d(80px, 36px, 0) rotateY(18deg) scale(0.94);
  transform-origin: right center;
}
body.aos-active [data-aos="neon-slide-up"] {
  transform: perspective(1000px) translate3d(0, 70px, 0) rotateX(16deg) scale(0.94);
  transform-origin: center bottom;
}
body.aos-active [data-aos="card-flare"] {
  transform: perspective(1200px) translate3d(0, 86px, -80px) rotateX(22deg) scale(0.9);
  clip-path: inset(18% 8% 0 8% round 20px);
}
body.aos-active [data-aos="ring-surge"] {
  transform: perspective(900px) translate3d(0, 64px, 0) rotateX(26deg) rotateZ(-8deg) scale(0.82);
  transform-origin: center center;
}
body.aos-active [data-aos="number-spark"] {
  transform: perspective(900px) translate3d(0, 80px, 0) rotateX(18deg) scale(0.9);
  transform-origin: center bottom;
}
body.aos-active [data-aos="panel-lift"] {
  transform: perspective(900px) translate3d(0, 72px, 0) rotateX(14deg) rotateZ(2deg) scale(0.92);
  transform-origin: center bottom;
}
body.aos-active [data-aos="neon-slide-right"].aos-animate,
body.aos-active [data-aos="neon-slide-left"].aos-animate,
body.aos-active [data-aos="neon-slide-up"].aos-animate,
body.aos-active [data-aos="card-flare"].aos-animate,
body.aos-active [data-aos="ring-surge"].aos-animate,
body.aos-active [data-aos="number-spark"].aos-animate,
body.aos-active [data-aos="panel-lift"].aos-animate {
  opacity: 1;
  transform: perspective(1000px) translate3d(0, 0, 0) rotateX(0) rotateY(0) rotateZ(0) scale(1);
}
body.aos-active [data-aos="card-flare"].aos-animate {
  clip-path: inset(0 0 0 0 round 20px);
}
body.aos-active [data-aos="ring-surge"].aos-animate .tech-ring {
  animation: ring-pop 0.9s cubic-bezier(0.2, 0.9, 0.2, 1.2);
}
body.aos-active [data-aos="number-spark"].aos-animate .stat-number {
  animation: number-glow 1.1s ease-out;
}
body.aos-active [data-aos="panel-lift"].aos-animate .adv-glow {
  opacity: 1;
  animation: glow-sweep 1.1s ease-out forwards;
}
@keyframes ring-pop {
  0% { transform: scale(0.7) rotate(-18deg); filter: drop-shadow(0 0 0 rgba(0,212,255,0)); }
  65% { transform: scale(1.08) rotate(6deg); filter: drop-shadow(0 0 24px rgba(0,212,255,0.45)); }
  100% { transform: scale(1) rotate(0); filter: drop-shadow(0 0 10px rgba(0,212,255,0.2)); }
}
@keyframes number-glow {
  0% { text-shadow: 0 0 0 rgba(0,212,255,0); transform: scale(0.86); }
  55% { text-shadow: 0 0 28px rgba(0,212,255,0.55); transform: scale(1.08); }
  100% { text-shadow: 0 0 0 rgba(0,212,255,0); transform: scale(1); }
}
@keyframes glow-sweep {
  0% { transform: translate(-20%, -20%) scale(0.6); }
  100% { transform: translate(35%, 35%) scale(1.4); opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  [data-aos="neon-slide-right"],
  [data-aos="neon-slide-left"],
  [data-aos="neon-slide-up"],
  [data-aos="card-flare"],
  [data-aos="ring-surge"],
  [data-aos="number-spark"],
  [data-aos="panel-lift"] {
    transform: none;
    clip-path: none;
  }
  [data-aos="ring-surge"].aos-animate .tech-ring,
  [data-aos="number-spark"].aos-animate .stat-number,
  [data-aos="panel-lift"].aos-animate .adv-glow {
    animation: none;
  }
}