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

:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-primary-light: #dbeafe;
  --color-accent: #6366f1;
  --color-text: #1e293b;
  --color-text-light: #64748b;
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-bg-dark: #0f172a;
  --color-border: #e2e8f0;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
  --transition: 0.3s ease;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--color-text);
  line-height: 1.6;
  background: var(--color-bg);
}

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

.section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 60px;
}

.section-tag {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 4px 16px;
  border-radius: 100px;
  margin-bottom: 16px;
  letter-spacing: 0.5px;
}

.section-title {
  font-size: 36px;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 16px;
  color: var(--color-bg-dark);
}

.section-desc {
  font-size: 17px;
  color: var(--color-text-light);
  line-height: 1.7;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition);
  border: 2px solid transparent;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
}

.btn-block {
  width: 100%;
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition);
}

.header.scrolled {
  box-shadow: var(--shadow);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.logo-img {
  height: 80px;
  width: auto;
  display: block;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: 8px;
}

.nav-link {
  display: block;
  padding: 8px 18px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text-light);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

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

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

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

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

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

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

.hero {
  padding: 160px 0 100px;
  background: linear-gradient(135deg, #f0f5ff 0%, #e8f0fe 40%, #f8fafc 100%);
  overflow: hidden;
}

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

.hero-title {
  font-size: 48px;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 24px;
  color: var(--color-bg-dark);
}

.hero-title span {
  color: var(--color-primary);
  display: block;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 36px;
  max-width: 480px;
}

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

.hero-visual {
  position: relative;
  height: 400px;
}

.hero-card {
  position: absolute;
  background: #fff;
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 14px;
  animation: float 5s ease-in-out infinite;
}

.hero-card .card-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.card-1 {
  top: 20px;
  left: 10%;
  animation-delay: 0s;
}

.card-1 .card-icon {
  background: #dbeafe;
  color: var(--color-primary);
}

.card-2 {
  top: 140px;
  right: 5%;
  animation-delay: 1.5s;
}

.card-2 .card-icon {
  background: #ede9fe;
  color: var(--color-accent);
}

.card-3 {
  bottom: 20px;
  left: 20%;
  animation-delay: 3s;
}

.card-3 .card-icon {
  background: #d1fae5;
  color: #059669;
}

.card-label {
  font-size: 16px;
  font-weight: 600;
  white-space: nowrap;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

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

.about-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.about-card {
  text-align: center;
  padding: 40px 28px;
  border-radius: var(--radius);
  background: var(--color-bg-alt);
  transition: all var(--transition);
}

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

.about-icon {
  font-size: 40px;
  margin-bottom: 20px;
  display: block;
}

.about-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}

.about-card p {
  color: var(--color-text-light);
  font-size: 15px;
  line-height: 1.7;
}

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

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

.service-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 36px 28px;
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.service-icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: var(--radius-sm);
  margin-bottom: 24px;
}

.service-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
}

.service-card p {
  color: var(--color-text-light);
  font-size: 14px;
  line-height: 1.7;
}

.stats {
  background: var(--color-bg-dark);
  padding: 80px 0;
}

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

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-number {
  font-size: 48px;
  font-weight: 800;
  color: #fff;
  line-height: 1;
}

.stat-suffix {
  font-size: 24px;
  font-weight: 600;
  color: var(--color-primary);
  margin-left: 2px;
}

.stat-label {
  font-size: 15px;
  color: #94a3b8;
  margin-top: 8px;
}

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

.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.team-card {
  text-align: center;
  padding: 40px 20px;
  border-radius: var(--radius);
  background: var(--color-bg-alt);
  transition: all var(--transition);
}

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

.team-avatar {
  width: 72px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  border-radius: 50%;
  font-size: 28px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
}

.team-card:nth-child(2) .team-avatar {
  background: linear-gradient(135deg, #7c3aed, #a855f7);
}

.team-card:nth-child(3) .team-avatar {
  background: linear-gradient(135deg, #059669, #10b981);
}

.team-card:nth-child(4) .team-avatar {
  background: linear-gradient(135deg, #d97706, #f59e0b);
}

.team-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 4px;
}

.team-role {
  display: block;
  font-size: 14px;
  color: var(--color-primary);
  font-weight: 500;
  margin-bottom: 12px;
}

.team-card p {
  color: var(--color-text-light);
  font-size: 14px;
  line-height: 1.6;
}

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

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

.contact-info .section-tag {
  margin-bottom: 16px;
}

.contact-info .section-title {
  margin-bottom: 12px;
}

.contact-info .section-desc {
  margin-bottom: 32px;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 15px;
  color: var(--color-text-light);
}

.contact-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #fff;
  border-radius: var(--radius-sm);
  font-size: 18px;
  flex-shrink: 0;
}

.contact-form {
  background: #fff;
  padding: 40px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

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

.form-row .form-group {
  margin-bottom: 0;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-text);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  font-size: 15px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg-alt);
  transition: all var(--transition);
  font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
  background: #fff;
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

.footer {
  background: var(--color-bg-dark);
  color: #cbd5e1;
  padding: 64px 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand .logo {
  display: inline-block;
  margin-bottom: 16px;
}

.footer-brand .logo-img {
  filter: brightness(0) saturate(100%) invert(1);
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.7;
  max-width: 280px;
}

.footer-links h4 {
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

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

.footer-links a {
  color: #94a3b8;
  text-decoration: none;
  font-size: 14px;
  transition: color var(--transition);
}

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

.footer-newsletter h4 {
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.footer-newsletter p {
  font-size: 14px;
  color: #94a3b8;
  margin-bottom: 16px;
}

.newsletter-form {
  display: flex;
  gap: 8px;
}

.newsletter-form input {
  flex: 1;
  padding: 10px 14px;
  font-size: 14px;
  border: 1px solid #334155;
  border-radius: var(--radius-sm);
  background: #1e293b;
  color: #fff;
  font-family: inherit;
}

.newsletter-form input::placeholder {
  color: #64748b;
}

.newsletter-form input:focus {
  outline: none;
  border-color: var(--color-primary);
}

.newsletter-form .btn {
  padding: 10px 20px;
  font-size: 14px;
}

.footer-bottom {
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid #1e293b;
  font-size: 14px;
  color: #64748b;
}

@media (max-width: 1024px) {
  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-subtitle {
    max-width: 100%;
  }

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

  .hero-visual {
    display: none;
  }

  .about-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }

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

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
  }

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

  .contact-wrapper {
    grid-template-columns: 1fr;
    gap: 40px;
  }

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

@media (max-width: 768px) {
  .section {
    padding: 64px 0;
  }

  .section-title {
    font-size: 28px;
  }

  .hero {
    padding: 120px 0 64px;
  }

  .hero-title {
    font-size: 34px;
  }

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

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

  .team-grid {
    grid-template-columns: 1fr;
    max-width: 360px;
    margin: 0 auto;
  }

  .menu-toggle {
    display: flex;
  }

  .nav {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(12px);
    padding: 20px;
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition);
  }

  .nav.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-list {
    flex-direction: column;
    gap: 4px;
  }

  .nav-link {
    padding: 12px 16px;
    font-size: 16px;
  }

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

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

  .contact-form {
    padding: 28px;
  }

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

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .hero-actions .btn {
    width: 100%;
    max-width: 300px;
  }
}