/* Common Styles */
body {
  font-family: 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
  font-size: 14px;
  line-height: 1.6;
  color: #ffffff;
  background-color: #000000;
  min-height: 100vh;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.container-fluid {
  width: 100%;
  padding: 0 20px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: 15px;
  color: #ffffff;
}

h1 { font-size: 36px; }
h2 { font-size: 30px; }
h3 { font-size: 24px; }
h4 { font-size: 20px; }
h5 { font-size: 16px; }
h6 { font-size: 14px; }

p {
  margin-bottom: 15px;
  color: #cccccc;
}

/* Links */
a {
  color: #00d4ff;
  text-decoration: none;
  transition: all 0.3s ease;
}

a:hover {
  color: #ffffff;
  text-decoration: none;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 12px 24px;
  font-size: 14px;
  font-weight: 500;
  text-align: center;
  text-decoration: none;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.3s ease;
  line-height: 1;
}

.btn-primary {
  background: linear-gradient(135deg, #00d4ff 0%, #0099cc 100%);
  color: #ffffff;
  border: 1px solid #00d4ff;
}

.btn-primary:hover {
  background: linear-gradient(135deg, #0099cc 0%, #007399 100%);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 212, 255, 0.3);
}

.btn-outline {
  background: transparent;
  color: #00d4ff;
  border: 1px solid #00d4ff;
}

.btn-outline:hover {
  background: #00d4ff;
  color: #000000;
}

.btn-lg {
  padding: 16px 32px;
  font-size: 16px;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 12px;
}

/* Form Elements */
.form-control {
  width: 100%;
  padding: 12px 16px;
  font-size: 14px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 6px;
  color: #ffffff;
  transition: all 0.3s ease;
}

.form-control:focus {
  border-color: #00d4ff;
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

.form-control::placeholder {
  color: rgba(255, 255, 255, 0.5);
}

/* Grid System */
.row {
  display: flex;
  flex-wrap: wrap;
  margin: 0 -15px;
}

.col {
  flex: 1;
  padding: 0 15px;
}

.col-1 { flex: 0 0 8.333333%; max-width: 8.333333%; }
.col-2 { flex: 0 0 16.666667%; max-width: 16.666667%; }
.col-3 { flex: 0 0 25%; max-width: 25%; }
.col-4 { flex: 0 0 33.333333%; max-width: 33.333333%; }
.col-6 { flex: 0 0 50%; max-width: 50%; }
.col-8 { flex: 0 0 66.666667%; max-width: 66.666667%; }
.col-9 { flex: 0 0 75%; max-width: 75%; }
.col-12 { flex: 0 0 100%; max-width: 100%; }

/* Spacing */
.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 10px; }
.mt-2 { margin-top: 20px; }
.mt-3 { margin-top: 30px; }
.mt-4 { margin-top: 40px; }
.mt-5 { margin-top: 50px; }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 10px; }
.mb-2 { margin-bottom: 20px; }
.mb-3 { margin-bottom: 30px; }
.mb-4 { margin-bottom: 40px; }
.mb-5 { margin-bottom: 50px; }

.pt-0 { padding-top: 0; }
.pt-1 { padding-top: 10px; }
.pt-2 { padding-top: 20px; }
.pt-3 { padding-top: 30px; }
.pt-4 { padding-top: 40px; }
.pt-5 { padding-top: 50px; }

.pb-0 { padding-bottom: 0; }
.pb-1 { padding-bottom: 10px; }
.pb-2 { padding-bottom: 20px; }
.pb-3 { padding-bottom: 30px; }
.pb-4 { padding-bottom: 40px; }
.pb-5 { padding-bottom: 50px; }

/* Text Alignment */
.text-left { text-align: left; }
.text-center { text-align: center; }
.text-right { text-align: right; }

/* Display */
.d-none { display: none; }
.d-block { display: block; }
.d-inline { display: inline; }
.d-inline-block { display: inline-block; }
.d-flex { display: flex; }

/* Flex */
.justify-content-start { justify-content: flex-start; }
.justify-content-center { justify-content: center; }
.justify-content-end { justify-content: flex-end; }
.justify-content-between { justify-content: space-between; }
.justify-content-around { justify-content: space-around; }

.align-items-start { align-items: flex-start; }
.align-items-center { align-items: center; }
.align-items-end { align-items: flex-end; }

/* Position */
.position-relative { position: relative; }
.position-absolute { position: absolute; }
.position-fixed { position: fixed; }

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.fade-in { animation: fadeIn 0.6s ease-out; }
.fade-in-up { animation: fadeInUp 0.8s ease-out; }
.slide-in-left { animation: slideInLeft 0.8s ease-out; }

/* Responsive */
@media (max-width: 768px) {
  .container {
    padding: 0 15px;
  }
  
  .col-md-6 { flex: 0 0 50%; max-width: 50%; }
  .col-md-12 { flex: 0 0 100%; max-width: 100%; }
  
  h1 { font-size: 28px; }
  h2 { font-size: 24px; }
  h3 { font-size: 20px; }
}

@media (max-width: 576px) {
  .col-sm-12 { flex: 0 0 100%; max-width: 100%; }
  
  h1 { font-size: 24px; }
  h2 { font-size: 20px; }
  h3 { font-size: 18px; }
}