html {
  font-size: 16px;
  background: #fff;
}

@media (min-width: 768px) {
  html {
    font-size: 18px;
  }
}

@media (min-width: 1200px) {
  html {
    font-size: 20px;
  }
}

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

h1, h2, h3, h4, h5 {
  font-weight: normal;
  margin: 0;
  padding: 0;
}

body {
  font-family: "Microsoft YaHei", sans-serif;
  font-size: 1rem;
  margin: 0;
  background: #fff;
  color: #333;
  line-height: 1.6;
}

.container {
  width: 100%;
  margin: 0;
  padding: 0;
}

/* Header Styles */
.header {
  padding: 1rem 0 4rem;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.header .up {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.header .up .left {
  font-size: 1.5rem;
  font-weight: bold;
  color: #fff;
  flex: 1;
  min-width: 200px;
}

.header .up ul {
  display: flex;
  list-style-type: none;
  margin: 0;
  padding: 0;
  flex: 2;
  justify-content: flex-end;
}

.header .up ul li {
  margin-left: 1.5rem;
}

.header .up ul li a {
  text-decoration: none;
  color: #fff;
  font-size: 1rem;
  transition: all 0.3s;
  opacity: 0.9;
}

.header .up ul li a:hover {
  opacity: 1;
  transform: translateY(-2px);
}

.header .down {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  margin-top: 2rem;
  padding: 3rem 1rem;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  background: #fff;
  border-radius: 2rem;
  box-shadow: 0 10px 40px rgba(0,0,0,0.1);
}

.header .down .left {
  margin-bottom: 2rem;
  width: 100%;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 3rem;
}

.header .down .left .logo-img {
  width: 180px;
  height: 180px;
  flex-shrink: 0;
  transition: transform 0.3s;
}

.header .down .left .logo-img:hover {
  transform: scale(1.05);
}

.header .down .left .text-content {
  flex: 1;
  text-align: left;
}

.header .down .left h2 {
  font-size: 1.8rem;
  color: #3057F4;
  margin-bottom: 1rem;
  font-weight: bold;
}

.header .down .left h3 {
  font-size: 1.1rem;
  color: #666;
  margin-bottom: 2rem;
  line-height: 1.8;
}

.header .down .btn {
  display: inline-block;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: #fff;
  padding: 1rem 3rem;
  border-radius: 3rem;
  text-decoration: none;
  font-size: 1.2rem;
  font-weight: bold;
  transition: all 0.3s;
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.header .down .btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.header .down .right img {
  max-width: 100%;
  height: auto;
}

/* Section 1 Styles */
.section-1 {
  background: #f5f8fa;
  padding: 3rem 0;
}

.section-1 .content {
  display: flex;
  flex-direction: row;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
  gap: 3rem;
}

.section-1 .left {
  flex: 1;
  text-align: left;
}

.section-1 .left h1 {
  font-size: 1.8rem;
  font-weight: bold;
  color: #000;
  margin-bottom: 1rem;
}

.section-1 .left h2 {
  font-size: 1.2rem;
  color: #409EFF;
  margin-bottom: 2rem;
}

.section-1 .left ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.section-1 .left li {
  display: flex;
  align-items: center;
  background: #fff;
  padding: 0.8rem 1.5rem;
  border-radius: 2rem;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  cursor: pointer;
  transition: all 0.3s;
  justify-content: center;
}

.section-1 .left li:hover {
  transform: translateY(-5px);
  box-shadow: 0 4px 15px rgba(48, 87, 244, 0.3);
}

.section-1 .left li.active {
  background: #3057F4;
  color: #fff;
}

.section-1 .left li.active span {
  background: #fff !important;
}

.section-1 .left li.active text {
  color: #fff;
}

.section-1 .left li span {
  width: 0.8rem;
  height: 0.8rem;
  border-radius: 50%;
  margin-right: 0.5rem;
}

.section-1 .left li:nth-of-type(1) span {
  background: #298CFC;
}

.section-1 .left li:nth-of-type(2) span {
  background: #00C07A;
}

.section-1 .left li:nth-of-type(3) span {
  background: #FF733D;
}

.section-1 .left li:nth-of-type(4) span {
  background: #F9B101;
}

.section-1 .left li:nth-of-type(5) span {
  background: #9C27B0;
}

.section-1 .left li:nth-of-type(6) span {
  background: #FF5722;
}

.section-1 .left li text {
  font-size: 1rem;
}

.section-1 .right {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
}

.section-1 .right img {
  width: 100%;
  max-width: 500px;
  height: auto;
}

/* Section 2 Styles */
.section-2 {
  padding: 3rem 0;
  background: #fff;
}

.section-2 .content {
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.section-2 .left {
  margin-bottom: 2rem;
  text-align: center;
}

.section-2 .left img {
  width: 100%;
  max-width: 400px;
  margin: 0 auto;
}

.section-2 .right {
  text-align: center;
}

.section-2 .right h1 {
  font-size: 1.8rem;
  font-weight: bold;
  color: #000;
  margin-bottom: 1rem;
}

.section-2 .right h2 {
  font-size: 1.1rem;
  color: #666;
  max-width: 600px;
  margin: 0 auto;
}

/* Section 5 Styles */
.section-5 {
  padding: 3rem 1rem;
  background: #fff;
}

.section-5 h1 {
  text-align: center;
  font-size: 1.8rem;
  font-weight: bold;
  color: #000;
  margin-bottom: 3rem;
}

.section-5 ul {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  margin: 0 auto;
  padding: 0;
  gap: 2rem;
  justify-content: center;
  max-width: 1200px;
}

.section-5 ul li {
  background: #fff;
  border-radius: 1rem;
  padding: 1.5rem;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  flex: 1;
  min-width: 280px;
  max-width: 350px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.section-5 ul li .left {
  margin-bottom: 1rem;
}

.section-5 ul li .left img {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
}

.section-5 ul li .right {
  font-size: 0.9rem;
  color: #666;
  text-align: left;
}

/* Footer Styles */
.footer {
  padding: 2rem 1rem;
  background: #F5F8FA;
  text-align: center;
}

.footer .copyright {
  font-size: 0.9rem;
  color: #666;
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .header .up {
    flex-direction: column;
    gap: 1rem;
  }
  
  .header .up ul {
    justify-content: center;
    flex-wrap: wrap;
  }
  
  .header .up ul li {
    margin: 0.5rem;
  }
  
  .header .down .left {
    flex-direction: column;
    text-align: center;
    gap: 1.5rem;
  }
  
  .header .down .left .logo-img {
    width: 120px;
    height: 120px;
  }
  
  .header .down .left .text-content {
    text-align: center;
  }
  
  .section-1 .content {
    flex-direction: column;
  }
  
  .section-1 .left {
    text-align: center;
  }
  
  .section-1 .left ul {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .section-1 .right img {
    max-width: 100%;
  }
  
  .section-5 ul {
    flex-direction: column;
    align-items: center;
  }
  
  .section-5 ul li {
    width: 100%;
    max-width: 400px;
  }
}

@media (min-width: 768px) {
  .header .down {
    flex-direction: row;
    text-align: left;
    justify-content: space-between;
    padding: 4rem 3rem;
  }
  
  .header .down .left {
    margin-bottom: 0;
    flex: 1;
    gap: 4rem;
  }
  
  .header .down .left .logo-img {
    width: 220px;
    height: 220px;
  }
  
  .header .down .left .text-content {
    text-align: left;
  }
  
  .header .down .left h2 {
    font-size: 2.2rem;
  }
  
  .header .down .left h3 {
    font-size: 1.2rem;
  }
  
  .header .down .right {
    flex: 1;
    display: flex;
    justify-content: flex-end;
  }
  
  .section-1 .content {
    flex-direction: row;
  }
  
  .section-1 .left {
    text-align: left;
  }
  
  .section-2 .content {
    flex-direction: row;
    text-align: left;
  }
  
  .section-2 .left {
    margin-bottom: 0;
    flex: 1;
  }
  
  .section-2 .right {
    flex: 1;
    margin-left: 2rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }
  
  .section-2 .right h1 {
    text-align: left;
  }
  
  .section-2 .right h2 {
    text-align: left;
  }
}