:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #60a5fa;
  --accent: #06b6d4;
  --accent-dark: #0891b2;
  --dark: #0a0f1e;
  --dark-2: #111827;
  --dark-3: #1f2937;
  --text: #1f2937;
  --text-light: #6b7280;
  --text-white: #f9fafb;
  --bg-light: #ffffff;
  --bg-gray: #f3f4f6;
  --bg-dark: #0f172a;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-lg: 0 10px 40px rgba(0,0,0,0.12);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.2);
  --radius: 16px;
  --radius-sm: 8px;
  --transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 100px 0;
}

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.4rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 20px;
  color: var(--dark);
}

.section-desc {
  font-size: 1.1rem;
  color: var(--text-light);
  max-width: 640px;
  line-height: 1.8;
}

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

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

#particles-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
}

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 18px 0;
  transition: var(--transition);
}

.navbar.scrolled {
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 12px 0;
  box-shadow: 0 1px 20px rgba(0,0,0,0.06);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-white);
  transition: var(--transition);
}

.navbar.scrolled .logo {
  color: var(--dark);
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: white;
  font-weight: 700;
}

.logo span {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: rgba(255,255,255,0.85);
  transition: var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: var(--transition);
}

.nav-links a:hover::after { width: 100%; }
.navbar.scrolled .nav-links a { color: var(--text); }
.nav-links a:hover { color: var(--accent); }

.nav-cta {
  padding: 10px 28px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 50px;
  color: white !important;
  font-weight: 600;
  transition: var(--transition);
}

.nav-cta::after { display: none !important; }
.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(37, 99, 235, 0.35);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}

.hamburger span {
  width: 26px;
  height: 2.5px;
  background: white;
  border-radius: 4px;
  transition: var(--transition);
}

.navbar.scrolled .hamburger span { background: var(--dark); }

.hamburger.active span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, #0a0f1e 0%, #0f172a 40%, #1a1f35 100%);
  overflow: hidden;
  padding: 0;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(37,99,235,0.12) 0%, transparent 70%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(6,182,212,0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero-grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(37,99,235,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37,99,235,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

.hero .container {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  padding-top: 80px;
  padding-bottom: 80px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  background: rgba(37,99,235,0.15);
  border: 1px solid rgba(37,99,235,0.25);
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--primary-light);
  margin-bottom: 24px;
}

.hero-badge .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #22c55e;
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.2;
  color: var(--text-white);
  margin-bottom: 24px;
}

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

.hero p {
  font-size: 1.15rem;
  color: rgba(255,255,255,0.65);
  max-width: 520px;
  line-height: 1.8;
  margin-bottom: 36px;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition);
  border: none;
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  box-shadow: 0 4px 25px rgba(37,99,235,0.3);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 40px rgba(37,99,235,0.4);
}

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

.btn-outline:hover {
  border-color: var(--accent);
  background: rgba(6,182,212,0.1);
  transform: translateY(-3px);
}

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

.hero-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  padding: 36px;
  backdrop-filter: blur(20px);
  width: 100%;
  max-width: 420px;
}

.hero-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.hero-card-header .avatar-group {
  display: flex;
}

.hero-card-header .avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.1);
  margin-left: -8px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 0.8rem;
  font-weight: 600;
}

.hero-card-header .avatar:first-child { margin-left: 0; }

.hero-card-title {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.7);
}

.hero-card-title strong { color: white; display: block; margin-top: 2px; }

.hero-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.hero-stat {
  padding: 14px;
  background: rgba(255,255,255,0.04);
  border-radius: var(--radius-sm);
}

.hero-stat .num {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  display: block;
}

.hero-stat .label {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.5);
  margin-top: 4px;
}

.hero-glow-ring {
  position: absolute;
  width: 300px;
  height: 300px;
  border: 1px solid rgba(37,99,235,0.15);
  border-radius: 50%;
  animation: spin-slow 20s linear infinite;
  pointer-events: none;
}

.hero-glow-ring-2 {
  width: 200px;
  height: 200px;
  border-color: rgba(6,182,212,0.1);
  animation-duration: 15s;
  animation-direction: reverse;
}

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

.about {
  background: var(--bg-light);
  position: relative;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-image {
  position: relative;
}

.about-image-main {
  background: linear-gradient(135deg, #eff6ff, #ecfeff);
  border-radius: var(--radius);
  padding: 40px;
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.about-image-main .ai-icon {
  font-size: 6rem;
  opacity: 0.1;
  position: absolute;
}

.about-features {
  margin-top: 32px;
}

.about-feature-item {
  display: flex;
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--bg-gray);
}

.about-feature-item:last-child { border-bottom: none; }

.about-feature-item .icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

.about-feature-item .icon.purple { background: #ede9fe; color: #7c3aed; }
.about-feature-item .icon.blue { background: #dbeafe; color: #2563eb; }
.about-feature-item .icon.cyan { background: #cffafe; color: #0891b2; }

.about-feature-item h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.about-feature-item p {
  font-size: 0.9rem;
  color: var(--text-light);
}

.services {
  background: var(--bg-gray);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.service-card {
  background: var(--bg-light);
  border-radius: var(--radius);
  padding: 36px 28px;
  transition: var(--transition);
  border: 1px solid transparent;
  position: relative;
  overflow: hidden;
}

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

.service-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(37,99,235,0.1);
}

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

.service-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.service-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.service-card p {
  font-size: 0.92rem;
  color: var(--text-light);
  line-height: 1.7;
}

.service-card .service-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 18px;
}

.service-card .service-tags span {
  padding: 4px 12px;
  background: var(--bg-gray);
  border-radius: 50px;
  font-size: 0.78rem;
  color: var(--text-light);
}

.why-us {
  background: var(--bg-light);
}

.why-us-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.why-card {
  display: flex;
  gap: 20px;
  padding: 28px;
  border-radius: var(--radius);
  background: var(--bg-gray);
  transition: var(--transition);
}

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

.why-card .num {
  font-size: 2.5rem;
  font-weight: 800;
  color: rgba(37,99,235,0.12);
  line-height: 1;
  flex-shrink: 0;
}

.why-card h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.why-card p {
  font-size: 0.9rem;
  color: var(--text-light);
  line-height: 1.7;
}

.stats-bar {
  background: linear-gradient(135deg, var(--dark), var(--dark-2));
  padding: 60px 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
}

.stat-item .number {
  font-size: 2.8rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: block;
}

.stat-item .label {
  font-size: 0.95rem;
  color: rgba(255,255,255,0.6);
  margin-top: 6px;
}

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

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}

.contact-info h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.contact-info > p {
  color: var(--text-light);
  margin-bottom: 32px;
}

.contact-item {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
}

.contact-item .icon-box {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(37,99,235,0.1), rgba(6,182,212,0.1));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.contact-item h4 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-light);
  margin-bottom: 4px;
}

.contact-item p {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--dark);
}

.contact-form {
  background: var(--bg-light);
  padding: 36px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
}

.contact-form .form-group {
  margin-bottom: 20px;
}

.contact-form label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--dark);
}

.contact-form input,
.contact-form textarea,
.contact-form select {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid #e5e7eb;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: inherit;
  transition: var(--transition);
  background: var(--bg-light);
  color: var(--text);
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}

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

.contact-form .btn {
  width: 100%;
  justify-content: center;
  font-size: 1rem;
  padding: 16px 32px;
}

.footer {
  background: var(--dark);
  padding: 60px 0 32px;
  color: rgba(255,255,255,0.6);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 40px;
}

.footer-brand .logo {
  color: white;
  margin-bottom: 16px;
}

.footer-brand p {
  font-size: 0.9rem;
  line-height: 1.8;
  max-width: 360px;
}

.footer h4 {
  color: white;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.footer-links a {
  display: block;
  font-size: 0.9rem;
  padding: 6px 0;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--accent);
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.85rem;
}

.footer-bottom a {
  color: rgba(255,255,255,0.5);
  transition: var(--transition);
}

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

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

@media (max-width: 1024px) {
  .hero h1 { font-size: 2.8rem; }
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 40px; }
}

@media (max-width: 768px) {
  section { padding: 72px 0; }
  .section-title { font-size: 1.8rem; }
  .section-header { margin-bottom: 44px; }
  .hamburger { display: flex; }
  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--bg-light);
    flex-direction: column;
    padding: 80px 32px 32px;
    gap: 20px;
    box-shadow: var(--shadow-xl);
    transition: var(--transition);
    align-items: flex-start;
  }
  .nav-links.open { right: 0; }
  .nav-links a { color: var(--text) !important; }
  .nav-links a::after { display: none; }
  .nav-cta { width: 100%; text-align: center; justify-content: center; }
  .hero .container { grid-template-columns: 1fr; gap: 40px; padding-top: 100px; }
  .hero h1 { font-size: 2.2rem; }
  .hero p { font-size: 1rem; }
  .hero-visual { display: none; }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .services-grid { grid-template-columns: 1fr; }
  .why-us-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 28px; }
  .stat-item .number { font-size: 2rem; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 1.8rem; }
  .hero-buttons { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
  .footer-bottom { flex-direction: column; text-align: center; }
}