body {
  margin: 0;
  font-family: 'Segoe UI', Arial, sans-serif;
  background: #f7f9fb;
  color: #333;
  line-height: 1.6;
}
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 20px;
}
.header {
  background: #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
  padding: 0;
  border-bottom: 1px solid #e0e7ef;
}
.header__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 90px;
}
.logo {
  height: 80px;
}
.nav {
  display: flex;
  gap: 32px;
}
.nav__link {
  color: #333;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
  font-size: 1.1rem;
}
.nav__link:hover {
  color: #0077ff;
}
.main-content {
  background: #fff;
  padding: 40px 0;
}
.article h1 {
  font-size: 2.5rem;
  margin-bottom: 24px;
  color: #222;
  border-bottom: 2px solid #e9eef3;
  padding-bottom: 12px;
}
.article h2 {
  font-size: 1.8rem;
  margin-top: 40px;
  margin-bottom: 16px;
  color: #2c3e50;
}
.article p, .article li {
  font-size: 1.1rem;
  color: #34495e;
  margin-bottom: 16px;
}
.article a {
  color: #0077ff;
  text-decoration: none;
}
.article a:hover {
  text-decoration: underline;
}
.article ul {
  padding-left: 20px;
}
.article li {
  margin-bottom: 12px;
}
.article strong {
  color: #2c3e50;
}
.article em {
  color: #7f8c8d;
  font-style: italic;
}
.article figure {
  margin: 20px 0;
  padding: 12px;
  background: #f2f6fa;
  border-left: 4px solid #0077ff;
  border-radius: 4px;
}
.image-gallery {
  margin: 40px 0;
  padding: 24px;
  background-color: #f9fafb;
  border: 1px solid #e0e7ef;
  border-radius: 8px;
}

.image-gallery h3 {
  font-size: 1.5rem;
  color: #2c3e50;
  margin-top: 0;
  margin-bottom: 12px;
}

.image-gallery p {
  font-size: 1rem;
  color: #34495e;
  margin-bottom: 24px;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.gallery-item {
  margin: 0;
  padding: 0;
  background: none;
  border: none;
}

.gallery-item img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 6px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.gallery-item img:hover {
  transform: scale(1.03);
  box-shadow: 0 6px 16px rgba(0,0,0,0.15);
}

.gallery-item figcaption {
  margin-top: 12px;
  font-size: 0.9rem;
  color: #555;
  text-align: center;
}
.glossary-list dt {
  font-size: 1.3rem;
  font-weight: 600;
  color: #2c3e50;
  margin-top: 24px;
  border-bottom: 2px solid #e9eef3;
  padding-bottom: 8px;
}
.glossary-list dd {
  margin-left: 0;
  margin-top: 8px;
  padding-left: 16px;
  border-left: 3px solid #0077ff;
}
.phishing-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  box-shadow: 0 1px 4px rgba(0,0,0,0.05);
}
.phishing-table th, .phishing-table td {
  border: 1px solid #e0e7ef;
  padding: 12px 16px;
  text-align: left;
}
.phishing-table th {
  background: #f2f6fa;
  font-weight: 600;
  color: #2c3e50;
}
.phishing-table tr:nth-child(even) {
  background: #f9fafb;
}
.footer {
  background: #2c3e50;
  color: #fff;
  padding: 30px 0;
  text-align: center;
}
.footer p {
  margin: 0;
  font-size: 1rem;
  color: #bdc3c7;
}
@media (max-width: 600px) {
  .article h1 {
    font-size: 2rem;
  }
  .article h2 {
    font-size: 1.5rem;
  }
}