/*:root {*/
/*  --primary-color: #167537;*/
/*  --primary-dark: #4DA1A9;*/
/*  --primary-light: #E8F8F5;*/
/*  --secondary-color: #3498DB;*/
/*  --accent-color: #E67E22;*/
/*  --success-color: #2ecc71;*/
/*  --success-dark: #27ae60;*/
/*  --text-color: #2C3E50;*/
/*  --light-bg: #F9F9F9;*/
/*  --white: #FFFFFF;*/
/*  --gray: #95A5A6;*/
/*  --dark-gray: #444;*/
/*  --light-gray: #f5f5f5;*/
/*  --medium-gray: #666;*/
/*  --dark-medium-gray: #333;*/
/*  --light-border: #ddd;*/
/*  --dark-border: #999;*/
/*}*/

:root {
  --primary-color: #167537;
  --primary-dark: #0A365F;
  --primary-light: #E6F0FA;
  --secondary-color: #2980B9;
  --accent-color: #E4A11B;
  --success-color: #5f8171;
  --success-dark: #4CAF50;
  --text-color: #1E293B;
  --light-bg: #F8FAFC;
  --white: #FFFFFF;
  --gray: #64748B;
  --dark-gray: #334155;
  --light-gray: #E2E8F0;
  --medium-gray: #475569;
  --dark-medium-gray: #1E293B;
  --light-border: #CBD5E1;
  --dark-border: #94A3B8;
}


/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Microsoft YaHei', Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  scroll-behavior: smooth;
  background-color: var(--white);
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 20px;
}

.container-fluid {
  max-width: 100%;
  padding: 0 30px;
  margin: 0 auto;
}

/* Buttons */
.btn {
  display: inline-block;
  background-color: var(--primary-color);
  color: var(--white);
  padding: 1rem 2rem;
  text-decoration: none;
  border-radius: 5px;
  transition: background-color 0.3s;
  font-size: 1.1rem;
  font-weight: bold;
  border: 2px solid var(--primary-color);
  cursor: pointer;
}

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

.btn-outline {
  background-color: transparent;
  border: 2px solid var(--primary-color);
  color: var(--primary-color);
}

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

/* Cards */
.card {
  background: var(--white);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.card-img {
  width: 100%;
  height: 300px;
  object-fit: cover;
}

.card-content {
  padding: 1.5rem;
}

.card-content h3 {
  font-size: 1.4rem;
  color: var(--primary-color);
  margin-bottom: 1rem;
}

.card-content p {
  color: var(--gray);
  margin-bottom: 1rem;
}

/* Grid layouts */
.grid-2-cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2.5rem;
}

.grid-3-cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2.5rem;
}

.grid-4-cols {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}

.grid-4-cols .card {
  max-width: 100%;
}

/* Sections */
.section {
  padding: 3rem 0;
}

.section-title {
  text-align: center;
  margin-bottom: 3rem;
  font-size: 2.2rem;
  color: var(--primary-color);
}

/* Page header */
.page-header {
  background-color: var(--light-bg);
  padding: 3rem 0;
  text-align: center;
  margin-bottom: 3rem;
}

.page-header h1 {
  font-size: 2.5rem;
  color: var(--primary-color);
}

/* Back to top button */
.back-to-top {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background-color: var(--primary-color);
  color: var(--white);
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 24px;
  text-decoration: none;
  box-shadow: 0 2px 10px rgba(0,0,0,0.3);
  transition: all 0.3s ease;
  z-index: 99;
  opacity: 0;
  visibility: hidden;
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background-color: var(--primary-dark);
  transform: translateY(-3px);
}

/* Responsive design */
@media (max-width: 1200px) {
  .container-fluid {
    padding: 0 20px;
  }
  
  .main-content {
    padding: 0 20px;
  }
  
  .grid-4-cols {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }
}

@media (max-width: 992px) {
  .container-fluid {
    padding: 0 15px;
  }
  
  .main-content {
    padding: 0 15px;
  }

  .page-header {
    padding: 1.5rem 0;
    margin-bottom: 1.5rem;
  }

  .page-header h1 {
    font-size: 2rem;
  }

  .section {
    padding: 1.5rem 0;
  }

  .section-title {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
  }

  .grid-2-cols,
  .grid-3-cols,
  .grid-4-cols {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

@media (max-width: 768px) {
  .page-header {
    padding: 1.5rem 0;
    margin-bottom: 1.5rem;
  }

  .page-header h1 {
    font-size: 2rem;
  }

  .section {
    padding: 1.5rem 0;
  }

  .section-title {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
  }

  .grid-2-cols,
  .grid-3-cols,
  .grid-4-cols {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .main-content {
    flex-direction: column;
  }
}