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

:root {
  /* Primary Blues */
  --blue-50: #EFF6FF;
  --blue-100: #DBEAFE;
  --blue-200: #BFDBFE;
  --blue-400: #60A5FA;
  --blue-500: #3B82F6;
  --blue-600: #2563EB;
  --blue-700: #1D4ED8;
  --blue-800: #1E40AF;
  --blue-900: #1E3A8A;

  /* Neutrals */
  --gray-50: #F8FAFC;
  --gray-100: #F1F5F9;
  --gray-200: #E2E8F0;
  --gray-300: #CBD5E1;
  --gray-400: #94A3B8;
  --gray-500: #64748B;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1E293B;
  --gray-900: #0F172A;

  /* Accents */
  --green-500: #22C55E;
  --green-600: #16A34A;
  --amber-500: #F59E0B;
  --amber-600: #D97706;
  --violet-500: #8B5CF6;
  --violet-600: #7C3AED;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #3B82F6, #1D4ED8);
  --gradient-hero: linear-gradient(135deg, #0F172A 0%, #1E3A8A 50%, #172554 100%);
  --gradient-card: linear-gradient(145deg, rgba(59,130,246,0.08), rgba(29,78,216,0.04));

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.05);
  --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(59,130,246,0.15);

  /* Layout */
  --max-width: 1200px;
  --header-height: 72px;

  /* Transitions */
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--gray-800);
  background: #fff;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background: var(--blue-500);
  color: #fff;
}

a {
  color: inherit;
  text-decoration: none;
}

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

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: 1000;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: background var(--transition), box-shadow var(--transition);
}

.header.scrolled {
  background: rgba(15, 23, 42, 0.95);
  box-shadow: 0 1px 20px rgba(0,0,0,0.2);
}

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

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  z-index: 1001;
}

.logo-icon {
  flex-shrink: 0;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.logo-cn {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.5px;
}

.logo-en {
  font-size: 11px;
  font-weight: 600;
  color: var(--blue-400);
  letter-spacing: 1px;
  text-transform: uppercase;
}

/* Nav */
.nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-link {
  padding: 8px 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--gray-400);
  border-radius: 8px;
  transition: all var(--transition);
  position: relative;
}

.nav-link:hover {
  color: #fff;
  background: rgba(255,255,255,0.06);
}

.nav-link.active {
  color: #fff;
  background: rgba(59,130,246,0.15);
}

/* Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 1001;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all var(--transition);
}

.menu-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}
.menu-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Nav */
.mobile-nav {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--gray-900);
  z-index: 999;
  padding: 100px 32px 32px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}

.mobile-nav.active {
  opacity: 1;
  pointer-events: auto;
}

.mobile-nav nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.mobile-nav-link {
  display: block;
  font-size: 22px;
  font-weight: 600;
  color: var(--gray-400);
  padding: 16px 20px;
  border-radius: 12px;
  transition: all var(--transition);
}

.mobile-nav-link:hover,
.mobile-nav-link:focus {
  color: #fff;
  background: rgba(59,130,246,0.12);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--gradient-hero);
  overflow: hidden;
  padding: 120px 0 80px;
}

.hero-particles {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.particle {
  position: absolute;
  width: 3px;
  height: 3px;
  background: rgba(96, 165, 250, 0.5);
  border-radius: 50%;
  animation: floatUp 8s linear infinite;
}

.particle:nth-child(odd) {
  width: 2px;
  height: 2px;
  background: rgba(147, 197, 253, 0.4);
  animation-duration: 12s;
}

.particle:nth-child(3n) {
  width: 4px;
  height: 4px;
  background: rgba(59, 130, 246, 0.3);
  animation-duration: 10s;
}

@keyframes floatUp {
  0% {
    transform: translateY(100vh) scale(0);
    opacity: 0;
  }
  10% {
    opacity: 1;
  }
  90% {
    opacity: 1;
  }
  100% {
    transform: translateY(-10vh) scale(1);
    opacity: 0;
  }
}

.hero-glow {
  position: absolute;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(59,130,246,0.12) 0%, transparent 70%);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--blue-200);
  font-size: 14px;
  font-weight: 500;
  background: rgba(59,130,246,0.1);
  border: 1px solid rgba(59,130,246,0.2);
  padding: 8px 16px;
  border-radius: 100px;
  width: fit-content;
}

.badge-dot {
  width: 6px;
  height: 6px;
  background: var(--blue-400);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(1.3); }
}

.hero-title {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.hero-title-en {
  font-size: 56px;
  font-weight: 800;
  color: #fff;
  line-height: 1.15;
  letter-spacing: -1px;
}

.hero-title-cn {
  font-size: 48px;
  font-weight: 900;
  background: linear-gradient(135deg, #60A5FA, #3B82F6, #818CF8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.hero-subtitle-en {
  font-size: 17px;
  color: var(--gray-400);
  line-height: 1.6;
  max-width: 480px;
}

.hero-subtitle-cn {
  font-size: 20px;
  color: var(--blue-200);
  font-weight: 500;
  margin-top: -8px;
}

.hero-cta {
  display: flex;
  gap: 16px;
  margin-top: 8px;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-size: 16px;
  font-weight: 600;
  border-radius: 12px;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 4px 16px rgba(59,130,246,0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(59,130,246,0.4);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border: 1.5px solid rgba(255,255,255,0.2);
}

.btn-outline:hover {
  border-color: rgba(255,255,255,0.5);
  background: rgba(255,255,255,0.05);
}

/* Hero Visual */
.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-card {
  perspective: 1000px;
}

.hero-card-inner {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 24px;
  padding: 40px;
  backdrop-filter: blur(20px);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
  animation: cardFloat 6s ease-in-out infinite;
}

@keyframes cardFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.card-icon {
  opacity: 0.9;
}

.card-metrics {
  display: flex;
  align-items: center;
  gap: 20px;
}

.metric {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.metric-value {
  font-size: 24px;
  font-weight: 800;
  color: #fff;
}

.metric-label {
  font-size: 12px;
  color: var(--gray-400);
}

.metric-divider {
  width: 1px;
  height: 36px;
  background: rgba(255,255,255,0.1);
}

/* Scroll Indicator */
.scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
}

/* ===== Sections Common ===== */
section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-title {
  font-size: 40px;
  font-weight: 800;
  color: var(--gray-900);
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.section-desc {
  font-size: 18px;
  color: var(--gray-500);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
}

/* ===== Brand Meaning ===== */
.brand-meaning {
  background: var(--gray-50);
}

.meaning-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-bottom: 48px;
}

.meaning-card {
  background: #fff;
  border-radius: 20px;
  padding: 40px;
  border: 1px solid var(--gray-200);
  transition: all var(--transition);
}

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

.meaning-letter {
  font-size: 48px;
  font-weight: 900;
  letter-spacing: -1px;
  margin-bottom: 28px;
  line-height: 1;
}

.on-card .meaning-letter {
  background: linear-gradient(135deg, #3B82F6, #1D4ED8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.wei-card .meaning-letter {
  background: linear-gradient(135deg, #7C3AED, #5B21B6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.meaning-words {
  display: flex;
  flex-direction: column;
}

.word-item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 12px;
  padding: 8px 0;
}

.word-en {
  font-size: 20px;
  font-weight: 700;
  color: var(--gray-800);
  min-width: 100px;
}

.word-cn {
  font-size: 14px;
  color: var(--gray-500);
  background: var(--gray-100);
  padding: 2px 10px;
  border-radius: 6px;
}

.word-desc {
  width: 100%;
  font-size: 14px;
  color: var(--gray-500);
  margin-top: 2px;
  padding-left: 112px;
}

.word-divider {
  height: 1px;
  background: var(--gray-100);
  margin: 4px 0;
}

.brand-positioning {
  text-align: center;
  padding: 32px;
  background: var(--gradient-primary);
  border-radius: 16px;
  color: #fff;
}

.positioning-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  background: rgba(255,255,255,0.15);
  padding: 4px 16px;
  border-radius: 100px;
  margin-bottom: 12px;
}

.brand-positioning p {
  font-size: 22px;
  font-weight: 700;
}

/* ===== Services ===== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.service-card {
  background: #fff;
  border-radius: 20px;
  padding: 32px 28px;
  border: 1px solid var(--gray-200);
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.service-icon {
  margin-bottom: 4px;
}

.service-card h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--gray-900);
}

.service-card > p {
  font-size: 14px;
  color: var(--gray-500);
  line-height: 1.7;
  flex: 1;
}

.service-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.service-features li {
  font-size: 13px;
  color: var(--gray-600);
  padding-left: 20px;
  position: relative;
}

.service-features li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  background: var(--blue-500);
  border-radius: 50%;
}

/* ===== About ===== */
.about {
  background: var(--gray-50);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.about-text {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.about-lead {
  font-size: 20px;
  color: var(--gray-800);
  line-height: 1.7;
}

.about-text p {
  font-size: 16px;
  color: var(--gray-600);
  line-height: 1.8;
}

.about-text strong {
  color: var(--blue-700);
  font-weight: 700;
}

.about-values {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 12px;
}

.value-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 16px;
  background: #fff;
  border-radius: 12px;
  border: 1px solid var(--gray-200);
}

.value-icon {
  flex-shrink: 0;
  margin-top: 2px;
}

.value-item strong {
  font-size: 15px;
  color: var(--gray-800);
}

.value-item p {
  font-size: 13px;
  color: var(--gray-500);
  margin-top: 2px;
}

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

.about-graphic {
  position: relative;
  width: 280px;
  height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.graphic-ring {
  position: absolute;
  border-radius: 50%;
  border: 2px solid transparent;
}

.ring-1 {
  width: 100%;
  height: 100%;
  border-top-color: var(--blue-400);
  border-right-color: var(--blue-400);
  animation: spin 12s linear infinite;
}

.ring-2 {
  width: 80%;
  height: 80%;
  border-bottom-color: var(--violet-400);
  border-left-color: var(--violet-400);
  animation: spin 8s linear infinite reverse;
}

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

.graphic-center {
  text-align: center;
  z-index: 1;
}

.graphic-text {
  display: block;
  font-size: 32px;
  font-weight: 900;
  color: var(--blue-700);
  letter-spacing: 2px;
}

.graphic-sub {
  font-size: 14px;
  color: var(--gray-500);
  letter-spacing: 3px;
  text-transform: uppercase;
}

/* ===== Contact ===== */
.contact {
  background: #fff;
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px;
  background: var(--gray-50);
  border-radius: 16px;
  border: 1px solid var(--gray-200);
}

.contact-icon {
  flex-shrink: 0;
  margin-top: 2px;
}

.contact-item strong {
  display: block;
  font-size: 14px;
  color: var(--gray-500);
  margin-bottom: 4px;
}

.contact-item p {
  font-size: 16px;
  color: var(--gray-800);
  font-weight: 600;
}

.contact-item a {
  color: var(--blue-600);
  transition: color var(--transition);
}

.contact-item a:hover {
  color: var(--blue-500);
}

.contact-motto {
  display: flex;
  justify-content: center;
}

.motto-card {
  background: var(--gradient-hero);
  border-radius: 24px;
  padding: 56px 48px;
  text-align: center;
  width: 100%;
  max-width: 360px;
}

.motto-main {
  font-size: 32px;
  font-weight: 900;
  color: #fff;
  margin-bottom: 8px;
}

.motto-sub {
  font-size: 40px;
  font-weight: 800;
  color: var(--blue-400);
  letter-spacing: 6px;
  margin-bottom: 12px;
}

.motto-desc {
  font-size: 15px;
  color: var(--gray-400);
  font-style: italic;
}

/* ===== Footer ===== */
.footer {
  background: var(--gray-900);
  padding: 48px 0 32px;
  color: var(--gray-400);
}

.footer .container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #fff;
  font-size: 18px;
  font-weight: 700;
}

.footer-slogan {
  font-size: 14px;
  color: var(--gray-500);
}

.footer-links {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-links a {
  font-size: 14px;
  color: var(--gray-500);
  transition: color var(--transition);
}

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

.footer-bottom {
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.06);
  width: 100%;
}

.footer-company {
  font-size: 13px;
  color: var(--gray-500);
  margin-bottom: 8px;
}

.footer-icp {
  font-size: 12px;
}

.footer-icp a {
  color: var(--gray-500);
  transition: color var(--transition);
}

.footer-icp a:hover {
  color: var(--gray-300);
}

/* ===== Animations ===== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  section {
    padding: 72px 0;
  }

  .nav {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  .mobile-nav {
    display: flex;
    flex-direction: column;
  }

  .hero {
    padding: 100px 0 60px;
    min-height: auto;
  }

  .hero .container {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }

  .hero-content {
    align-items: center;
  }

  .hero-cta {
    justify-content: center;
  }

  .hero-title-en {
    font-size: 36px;
  }

  .hero-title-cn {
    font-size: 32px;
  }

  .hero-subtitle-en {
    font-size: 15px;
  }

  .hero-subtitle-cn {
    font-size: 17px;
  }

  .hero-visual {
    display: none;
  }

  .scroll-indicator {
    display: none;
  }

  .section-title {
    font-size: 30px;
  }

  .section-desc {
    font-size: 16px;
  }

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

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

  .about-content {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-visual {
    order: -1;
  }

  .about-graphic {
    width: 200px;
    height: 200px;
  }

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

  .hero-card-inner {
    padding: 24px;
  }
}

@media (max-width: 480px) {
  .hero-title-en {
    font-size: 28px;
  }

  .hero-title-cn {
    font-size: 26px;
  }

  .btn {
    padding: 12px 24px;
    font-size: 14px;
  }

  .meaning-card {
    padding: 24px;
  }

  .meaning-letter {
    font-size: 36px;
  }

  .service-card {
    padding: 24px 20px;
  }

  .footer-links {
    gap: 20px;
  }
}