article {
  line-height: 1.7;
  color: #333;
  background: #f8f9fa;
  padding: 20px;
  max-width: 900px;
  margin: 0 auto 1rem;
  background: white;
  padding: 60px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  border-radius: 8px;
}

h1 {
  font-size: 2.5em;
  line-height: 1.2;
  margin-bottom: 30px;
  color: #1a1a1a;
  font-weight: 700;
}

h2 {
  font-size: 1.8em;
  margin-top: 50px;
  margin-bottom: 20px;
  color: #2c3e50;
  font-weight: 600;
  border-bottom: 3px solid #3498db;
  padding-bottom: 10px;
}

h3 {
  font-size: 1.3em;
  margin-top: 30px;
  margin-bottom: 15px;
  color: #34495e;
  font-weight: 600;
}

p {
  margin-bottom: 20px;
  font-size: 1.05em;
}

.intro {
  font-size: 1.15em;
  color: #555;
  margin-bottom: 30px;
  line-height: 1.8;
}

hr {
  border: none;
  border-top: 2px solid #e0e0e0;
  margin: 50px 0;
}

.callout {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 20px 25px;
  border-radius: 8px;
  margin: 30px 0;
  font-size: 1.1em;
  font-weight: 500;
  border-left: 5px solid #fff;
}

.callout strong {
  font-weight: 700;
}

.insight {
  background: #fff3cd;
  border-left: 5px solid #ffc107;
  padding: 20px;
  margin: 25px 0;
  border-radius: 4px;
}

.fact {
  background: #d1ecf1;
  border-left: 5px solid #17a2b8;
  padding: 20px;
  margin: 25px 0;
  border-radius: 4px;
}

.warning {
  background: #f8d7da;
  border-left: 5px solid #dc3545;
  padding: 20px;
  margin: 25px 0;
  border-radius: 4px;
}

.tip {
  background: #d4edda;
  border-left: 5px solid #28a745;
  padding: 20px;
  margin: 25px 0;
  border-radius: 4px;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 25px 0;
  font-size: 0.95em;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

th {
  background: #3498db;
  color: white;
  padding: 15px;
  text-align: left;
  font-weight: 600;
}

td {
  padding: 12px 15px;
  border-bottom: 1px solid #ddd;
}

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

tr:hover {
  background: #e9ecef;
}

img {
  width: 100%;
  height: auto;
  margin: 30px 0;
  border-radius: 8px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
}

ul {
  margin: 20px 0;
  padding-left: 25px;
}

li {
  margin: 10px 0;
  font-size: 1.05em;
}

strong {
  color: #2c3e50;
  font-weight: 600;
}

.methodology {
  background: #f8f9fa;
  border: 2px solid #dee2e6;
  padding: 30px;
  border-radius: 8px;
  margin: 30px 0;
}

.methodology h3 {
  margin-top: 0;
}

.bottom-line {
  background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
  color: white;
  padding: 30px;
  border-radius: 8px;
  margin-top: 50px;
}

.bottom-line h2 {
  color: white;
  border-bottom: 2px solid white;
  margin-top: 0;
}

.bottom-line ol {
  font-size: 1.15em;
  margin-top: 20px;
}

@media (max-width: 768px) {
  article {
    padding: 30px 20px;
  }

  h1 {
    font-size: 2em;
  }

  h2 {
    font-size: 1.5em;
  }
}