@import url('https://fonts.googleapis.com/css2?family=Karla:ital,wght@0,400;0,700;1,400;1,700&family=PT+Sans+Narrow:wght@400;700&display=swap');

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

body {
  font-family: 'Karla', sans-serif;
  font-weight: 400;
  line-height: 1.6;
  color: #333;
  background-color: #ffffff;
}

/* Container chính */
.main-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

/* Typography hierarchy */
h1, h2, h3, h4, h5, h6 {
  font-family: "PT Sans Narrow", sans-serif;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
  color: #027EB6;
}

h1 {
  color: #006DAE;
  font-size: 3rem;
  padding-bottom: 0.5rem;
  margin-bottom: 2rem;
}

h2 {
  font-size: 1.65rem;
  color: #006DAE;
  margin-top: 2.5rem;
  margin-bottom: 2rem;
  border-bottom: 2px solid #0284C7; /* Gạch chân dưới */
  padding-bottom: 0.5rem; /* Giống h1 */
  border-left: none; /* Bỏ border trái */
  padding-left: 0; /* Reset padding trái */
}

h3 {
  font-size: 1.35rem;
  color: #006DAE;
  margin-top: 2.5rem;
  padding-left: 0.1rem;
}

h4 {
  font-size: 1rem;
  color: #03A9F4;
}

h5 {
  font-size: 1.25rem;
  color: #29B6F6;
}

h6 {
  font-size: 1.1rem;
  color: #4FC3F7;
}

/* Paragraph và text elements */
p {
  margin-bottom: 1.5rem;
  text-align: justify;
}

/* Links */
a {
  color: #0277BD;
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: #01579B;
  text-decoration: underline;
}

/* Code blocks */
pre, code {
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  background-color: #f8f9fa;
  border-radius: 4px;
}

pre {
  padding: 0.8rem;
  margin: 0.8rem 0;
  overflow-x: auto;
  font-size: 0.8rem;
  border-left: 4px solid #027EB6;
  background-color: #f1f8ff;
}

code {
  padding: 0.2rem 0.4rem;
  font-size: 0.9em;
  color: #D32F2F;
}

/* Blockquotes */
blockquote {
  padding: 1rem 1.5rem;
  margin: 1rem 0;
  background-color: #f8f9fa;
  font-style: italic;
  color: #555;
}

/* Lists */
ul, ol {
  margin: 1rem 0;
  padding-left: 2rem;
}

li {
  margin-bottom: 0.5rem;
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

th, td {
  padding: 0.75rem;
  text-align: left;
  border-bottom: 1px solid #ddd;
}

th {
  background-color: #027EB6;
  color: white;
  font-weight: 700;
  font-family: "PT Sans Narrow", sans-serif;
}

tr:nth-child(even) {
  background-color: #f8f9fa;
}

tr:hover {
  background-color: #e3f2fd;
}

/* Images */
img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 1.5rem auto;
  border-radius: 4px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

/* Horizontal rule */
hr {
  border: none;
  height: 2px;
  background: linear-gradient(90deg, transparent, #027EB6, transparent);
  margin: 2rem 0;
}

/* Navigation (nếu có) */
.navbar {
  background: linear-gradient(135deg, #006DAE 0%, #027EB6 100%);
  padding: 1rem 0;
  margin-bottom: 2rem;
}

.navbar-brand {
  color: white !important;
  font-family: "PT Sans Narrow", sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
}

/* Footer (nếu có) */
.footer {
  background-color: #f8f9fa;
  padding: 2rem 0;
  margin-top: 3rem;
  text-align: center;
  color: #666;
  border-top: 1px solid #e9ecef;
}

/* Responsive design */
@media (max-width: 768px) {
  .main-container {
    padding: 1rem;
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.75rem;
  }

  h3 {
    font-size: 1.5rem;
  }
}

/* Utility classes */
.text-center {
  text-align: center;
}

.text-muted {
  color: #666;
}

.bg-light {
  background-color: #f8f9fa;
}

.shadow {
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.rounded {
  border-radius: 4px;
}