/* Reset mặc định */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Body */
body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(135deg, #00b09b, #96c93d); /* Gradient nền */
    color: #fff;
    margin: 0;
    line-height: 1.6;
}

/* Header */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
    background: rgba(0, 0, 0, 0.7); /* Nền header trong suốt */
    position: sticky;
    top: 0;
    z-index: 1000;
}

.logo img {
    height: 50px;
}

.nav-links a {
    color: #fff;
    text-decoration: none;
    margin: 0 15px;
    font-weight: bold;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: #00ff99; /* Màu khi hover */
}

.actions button {
    margin-left: 10px;
    background: #fff;
    color: #0077cc;
    border: none;
    padding: 5px 15px;
    border-radius: 5px;
    font-weight: bold;
    cursor: pointer;
    transition: background 0.3s ease, color 0.3s ease;
}

.actions button:hover {
    background: #0077cc;
    color: #fff;
}

/* Hero Section */
.hero-section {
    text-align: center;
    padding: 50px 20px;
    background: rgba(0, 0, 0, 0.5); /* Hiệu ứng mờ */
    border-radius: 10px;
    margin: 20px;
    color: #fff;
}

.hero-section h1 {
    font-size: 3rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 5px rgba(0, 0, 0, 0.3); /* Hiệu ứng chữ nổi */
}

.hero-section h2 {
    font-size: 2rem;
    color: #00ff99;
    margin-bottom: 20px;
}

.hero-section p {
    max-width: 800px;
    margin: 0 auto;
    font-size: 1.2rem;
    line-height: 1.8;
}

/* Form Gửi Tiền Nhanh */
.transfer-form {
    max-width: 500px;
    background: #fff;
    color: #333;
    margin: 30px auto;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.3);
    text-align: center;
}

.transfer-form h3 {
    margin-bottom: 20px;
    color: #0077cc;
    font-size: 1.5rem;
    font-weight: bold;
}

.form-group {
    margin-bottom: 15px;
    text-align: left;
}

.form-group label {
    display: block;
    font-weight: bold;
    margin-bottom: 5px;
}

.form-group input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
}

.form-group input:focus {
    border-color: #0077cc;
    outline: none;
    box-shadow: 0px 0px 5px rgba(0, 119, 204, 0.5);
}

.submit-btn {
    padding: 10px 20px;
    background: #0077cc;
    color: #fff;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: background 0.3s ease, box-shadow 0.3s ease;
}

.submit-btn:hover {
    background: #005fa3;
    box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.3);
}

/* Hero Image */
.hero-image {
    text-align: center;
    margin: 40px 0;
}

.hero-image img {
    max-width: 80%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.3);
}

/* ===== Responsive cho Mobile / Tablet (<=768px) ===== */
@media (max-width: 768px) {
    .navbar {
      flex-direction: column;
      align-items: flex-start;
      padding: 15px;
    }
  
    .nav-links {
      display: flex;
      flex-direction: column;
      margin-top: 10px;
    }
  
    .nav-links a {
      margin: 5px 0;
    }
  
    .actions {
      width: 100%;
      display: flex;
      justify-content: flex-start;
      margin-top: 10px;
    }
  
    .actions button {
      padding: 8px 12px;
      font-size: 0.9rem;
    }
  
    .hero-section {
      padding: 30px 10px;
      margin: 10px;
    }
  
    .hero-section h1 {
      font-size: 2rem;
    }
  
    .hero-section h2 {
      font-size: 1.5rem;
    }
  
    .hero-section p {
      font-size: 1rem;
    }
  
    .transfer-form {
      width: 90%;
      margin: 20px auto;
      padding: 15px;
    }
  
    .transfer-form h3 {
      font-size: 1.3rem;
    }
  
    .form-group input {
      font-size: 0.95rem;
      padding: 8px;
    }
  
    .submit-btn {
      width: 100%;
      padding: 12px;
      font-size: 1rem;
    }
  
    .hero-image img {
      max-width: 100%;
      margin: 0 auto;
      border-radius: 8px;
    }
  }