:root {
  --primary-color: #e84118;
  --secondary-color: #ff7f50;
  --text-color: #333;
  --light-color: #f9f9f9;
  --dark-color: #222;
  --accent-color: #4cd137;
  --gradient: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  --shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  --border-radius: 8px;
}

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

body {
  font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
  color: var(--text-color);
  line-height: 1.6;
  background-color: #fff;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

header {
  background: var(--gradient);
  color: white;
  padding: 20px 0;
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 1000;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: white;
}

.logo img {
  width: 50px;
  height: 50px;
}

.logo h1 {
  font-size: 24px;
  font-weight: 700;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  color: white;
  cursor: pointer;
}

nav ul {
  display: flex;
  list-style: none;
  gap: 20px;
}

nav ul li a {
  color: white;
  text-decoration: none;
  font-size: 16px;
  font-weight: 500;
  transition: all 0.3s ease;
  padding: 8px 12px;
  border-radius: var(--border-radius);
}

nav ul li a:hover {
  background-color: rgba(255, 255, 255, 0.2);
}

.hero {
  background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="100%" height="100%" viewBox="0 0 100 100" preserveAspectRatio="none"><defs><linearGradient id="grad" x1="0%" y1="0%" x2="100%" y2="100%"><stop offset="0%" stop-color="%23e84118" stop-opacity="0.8"/><stop offset="100%" stop-color="%23ff7f50" stop-opacity="0.8"/></linearGradient></defs><rect width="100%" height="100%" fill="url(%23grad)"/><path d="M0,50 Q25,40 50,50 T100,50 L100,100 L0,100 Z" fill="rgba(255,255,255,0.1)"/></svg>') no-repeat center center;
  background-size: cover;
  padding: 100px 0;
  text-align: center;
  color: white;
}

.hero h2 {
  font-size: 36px;
  margin-bottom: 20px;
}

.hero p {
  font-size: 18px;
  max-width: 700px;
  margin: 0 auto 30px;
}

.btn {
  display: inline-block;
  background-color: var(--accent-color);
  color: white;
  padding: 12px 24px;
  border-radius: var(--border-radius);
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
}

.btn:hover {
  background-color: #3ca628;
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.features {
  padding: 80px 0;
  background-color: var(--light-color);
}

.section-title {
  text-align: center;
  margin-bottom: 50px;
  font-size: 32px;
  color: var(--primary-color);
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 80px;
  height: 4px;
  background: var(--gradient);
  margin: 15px auto 0;
  border-radius: 2px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.feature-card {
  background: white;
  padding: 30px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  transition: transform 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-10px);
}

.feature-card .icon {
  font-size: 48px;
  color: var(--primary-color);
  margin-bottom: 20px;
  display: block;
}

.feature-card h3 {
  font-size: 22px;
  margin-bottom: 15px;
  color: var(--dark-color);
}

.services {
  padding: 80px 0;
}

.services-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.service-item {
  display: flex;
  align-items: flex-start;
  gap: 15px;
}

.service-item .icon {
  font-size: 36px;
  color: var(--primary-color);
}

.service-content h3 {
  font-size: 20px;
  margin-bottom: 10px;
  color: var(--dark-color);
}

.cta {
  padding: 80px 0;
  background: var(--gradient);
  color: white;
  text-align: center;
}

.cta h2 {
  font-size: 36px;
  margin-bottom: 20px;
}

.cta p {
  font-size: 18px;
  max-width: 700px;
  margin: 0 auto 30px;
}

.cta .btn {
  background-color: white;
  color: var(--primary-color);
}

.cta .btn:hover {
  background-color: var(--dark-color);
  color: white;
}

.contact {
  padding: 80px 0;
  background-color: var(--light-color);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 15px;
}

.contact-item .icon {
  font-size: 24px;
  color: var(--primary-color);
}

.contact-form {
  display: grid;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-weight: 500;
}

.form-group input,
.form-group textarea {
  padding: 12px;
  border: 1px solid #ddd;
  border-radius: var(--border-radius);
  font-family: inherit;
  font-size: 16px;
  transition: border-color 0.3s ease;
}

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

footer {
  background-color: var(--dark-color);
  color: white;
  padding: 40px 0;
}

.footer-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 40px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
}

.footer-logo img {
  width: 40px;
  height: 40px;
}

.footer-logo h2 {
  font-size: 20px;
}

.footer-links h3 {
  font-size: 18px;
  margin-bottom: 15px;
  color: var(--secondary-color);
}

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

.footer-links ul li a {
  color: #bbb;
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer-links ul li a:hover {
  color: white;
}

.social-links {
  display: flex;
  gap: 15px;
  margin-top: 20px;
}

.social-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  color: white;
  font-size: 18px;
  transition: all 0.3s ease;
}

.social-links a:hover {
  background: var(--primary-color);
  transform: translateY(-3px);
}

.copyright {
  margin-top: 40px;
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: #bbb;
  font-size: 14px;
}

/* 移动端自适应 */
@media screen and (max-width: 768px) {
  .header-container {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav-toggle {
    display: block;
    position: absolute;
    right: 20px;
    top: 20px;
  }

  nav {
    width: 100%;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease;
  }

  nav.active {
    max-height: 300px;
  }

  nav ul {
    flex-direction: column;
    width: 100%;
    margin-top: 20px;
  }

  nav ul li {
    width: 100%;
  }

  nav ul li a {
    display: block;
    padding: 10px 0;
  }

  .hero {
    padding: 60px 0;
  }

  .hero h2 {
    font-size: 28px;
  }

  .section-title {
    font-size: 26px;
  }

  .feature-card,
  .service-item,
  .contact-grid {
    padding: 20px;
  }

  .footer-container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .footer-logo {
    justify-content: center;
  }

  .social-links {
    justify-content: center;
  }
}