/* color */
:root {
  --primary: #2B689C; /* màu xanh dương mặc định, bạn có thể thay bằng mã màu khác */
}
/* Reset mặc định */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }

  footer {
    margin-top: 40px;     /* tăng hoặc giảm px tuỳ ý */
  }

  .hero {
    margin-bottom: 40px;
  }
  
  body {
    font-family: 'Segoe UI', sans-serif;
    background-color: #f9f9f9;
    color: #333;
    overflow-x: hidden;
  }
  
  /* HEADER */
  .navbar {
    background-color: white;
    padding: 7px 0;
    border-bottom: 1px solid #ddd;
    position: sticky;
    top: 0;
    z-index: 1000;
  }
  
  .nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  .logo {
    height: 65px;
  }
  
  .nav-tabs {
    list-style: none;
    display: flex;
    gap: 24px;
  }
  
  .nav-tabs li {
    padding: 8px 16px;
    cursor: pointer;
    border-radius: 4px;
    font-weight: 500;
    color: #2c3e50;
    transition: background 0.3s;
  }
  
  .nav-tabs li:hover,
  .nav-tabs li.active {
    background-color: #e6f1ff;
    color: var(--primary);
  }
  
  /* HERO SECTION */
  .hero {
    background-color: var(--primary);
    color: white;
    text-align: center;
    padding: 150px 20px;
  }
 
  .hero-content {
    max-width: 800px;
    margin: auto;
  }
   
  .hero h1 {
    font-size: 50px;
    margin-bottom: 10px;
    font-weight: 700;
    letter-spacing: -1px;
  }
  
  .hero p {
    font-size: 26px;
    font-weight: 300;
    margin-bottom: 30px;
  }
  
  .btn-geoportal {
    background-color: #2c3e50;
    color: white;
    padding: 12px 28px;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    display: inline-block;
    transition: background 0.3s;
  }
  
  .btn-geoportal:hover {
    background-color: #1c2d3f;
  }
  
  /* MAIN CONTENT */
  section h2 {
    font-size: 32px;
    margin-bottom: 20px;
    text-align: left;
    color: var(--primary);
  }

  .section-header-divider {
    border: none;
    height: 2px;
    background-color: var(--primary);
    margin: 10px 0 20px;
    margin-bottom: 20px;
  }

/* Feature 1: calculate wqi */

  .card {
    border: 1px solid #ddd;
    border-radius: 12px;
    margin: 20px 0;
    box-shadow: 0 2px 6px rgba(0,0,0,0.05);
    background-color: #fff;
  }
  
  .card-header {
    background-color: #f2f2f2;
    padding: 12px 20px;
    font-weight: bold;
    font-size: 16px;
    border-bottom: 1px solid #ddd;
    border-top-left-radius: 12px;
    border-top-right-radius: 12px;
  }
  
  .card-body {
    padding: 16px 20px;
  }

  .btn-calc {
    padding: 10px 20px;
    background-color: var(--primary);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
  }

  .centered-container {
    max-width: 1300px;
    margin: 0 auto;
    padding: 20px;
  }
  
  .btn-calc:hover {
    background-color: #0056b3;
  }
  
  .btn-download {
    display: inline-block;
    padding: 8px 16px;
    background-color: var(--primary);
    color: white;
    text-decoration: none;
    border-radius: 6px;
    width: 220px;
    margin-bottom: 10px;
    margin-top: 10px
  }
  
  .btn-download:hover {
    background-color: #0056b3;
  }
  
  .status-message.success {
    color: #2e7d32;
    margin-bottom: 10px;
    font-weight: bold;
  }
  
  .btn-download {
    display: inline-block;
    padding: 10px 16px;
    background-color: var(--primary);
    color: white;
    text-decoration: none;
    border-radius: 4px;
    font-weight: 500;
  }

  #wqi-map {
    width: 100%;
    max-width: 1300px;
    height: 600px;
    margin: 0 auto;

  }
  .wqi-map--has-border {
    border: 3px solid var(--primary);
    border-radius: 4px;   /* tuỳ chọn bo góc */
    box-sizing: border-box;
  }

  .info.legend {
    background: white;
    padding: 8px;
    line-height: 1.4;
    box-shadow: 0 0 15px rgba(0,0,0,0.2);
    border-radius: 5px;
    width: 300px;
    font-size: 18px;
  }
  .info.legend i {
    width: 18px;
    height: 18px;
    float: left;
    margin-right: 8px;
    opacity: 0.8;
  }

  /* Tăng font-size và line-height cho nội dung popup */
  .leaflet-popup-content {
    font-size: 1rem;       /* hoặc 16px, 18px tuỳ bạn */
    line-height: 1.5;
    text-align: left;
  }

  /* Tăng chiều rộng tối đa của popup */
  .leaflet-popup-content-wrapper {
    max-width: 300px;      /* thay đổi nếu muốn rộng hơn */
  }

  /* (Tuỳ chọn) Tăng padding bên trong */
  .leaflet-popup-content-wrapper .leaflet-popup-content {
    padding: 10px 14px;    /* top/bottom 10px, left/right 14px */
  }

  /* (Tuỳ chọn) Tăng kích thước mũi tên */
  .leaflet-popup-tip-container .leaflet-popup-tip {
    width: 16px;
    height: 16px;
    margin-left: 12px
  }
  

/* Feature 2: Predict wqi */
.wqi-form-container {
  background: #fff;
  padding: 24px;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  margin: auto;
}

.wqi-form-container h2 {
  margin-bottom: 20px;
}

.wqi-form-container .form-group {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
}

.wqi-form-container label {
  flex: 1;
  font-weight: 500;
}

.wqi-form-container input {
  flex: 2;
  padding: 6px 10px;
  border: 1px solid #ccc;
  border-radius: 6px;
}

.wqi-form-container button {
  padding: 10px 20px;
  background-color: var(--primary);
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

.wqi-form-container button:hover {
  background-color: #0056b3;
}

#predict-result {
  margin-top: 24px;
  padding: 16px;
  border-radius: 8px;
  background-color: #f5f5f5;
}

.result-card {
  background: #ffffff;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
  margin-top: 20px;
  animation: fadeIn 0.3s ease;
}

.result-title {
  margin-bottom: 16px;
  font-size: 20px;
  font-weight: bold;
  color: #333;
}

.result-item {
  display: flex;
  align-items: center;
  margin-bottom: 10px;
}

.result-label {
  flex: 1;
  font-weight: 500;
  color: #555;
}

.result-value {
  flex: 2;
  font-weight: bold;
  font-size: 16px;
  color: #111;
  text-align: right;
}

.result-badge {
  background-color: #eee;
  padding: 4px 10px;
  border-radius: 12px;
  font-weight: 600;
  color: #222;
  border: 1px solid #ccc;
  margin-left: auto;
}

.color-tag {
  display: inline-block;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  margin-right: 8px;
  border: 1px solid #999;
}

.color-code {
  font-family: monospace;
  color: #444;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}


  
  
  /* FOOTER */
  .footer {
    text-align: center;
    padding: 20px;
    font-size: 18px;
    color: white;
    background-color: var(--primary);
    border-top: 1px solid #ccc;
  }
  
  .footer a {
    color: white;
    text-decoration: none;
  }
  
  .footer a:hover {
    text-decoration: underline;
  }