* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: #f3f6fa;
  color: #17202a;
  line-height: 1.7;
  font-size: 17px;
}

.container {
  max-width: 780px;
  margin: 0 auto;
  padding: 0 18px;
}

.site-header {
  background: linear-gradient(135deg, #071a33, #0b4ea2);
  color: #fff;
  padding: 28px 0 30px;
  margin-bottom: 28px;
}

.logo {
  color: #fff;
  font-size: 32px;
  font-weight: 800;
  text-decoration: none;
  letter-spacing: -0.5px;
}

.tagline {
  margin: 8px 0 0;
  color: #dbeafe;
  font-size: 15px;
}

.article {
  background: #fff;
  padding: 34px;
  margin: 24px 0;
  border-radius: 18px;
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.08);
}

.article-meta {
  color: #64748b;
  font-size: 14px;
  margin-bottom: 14px;
}

h1 {
  font-size: 34px;
  line-height: 1.18;
  margin: 0 0 22px;
  letter-spacing: -0.7px;
  color: #0f172a;
}

h2 {
  font-size: 24px;
  margin-top: 34px;
  margin-bottom: 12px;
  color: #10233f;
}

h3 {
  font-size: 19px;
  margin-top: 24px;
  margin-bottom: 8px;
  color: #17202a;
}

p {
  margin: 0 0 18px;
}

a {
  color: #0b4ea2;
  text-decoration: none;
  font-weight: 700;
}

a:hover {
  text-decoration: underline;
}

ul {
  padding-left: 22px;
  margin: 16px 0 22px;
}

li {
  margin-bottom: 8px;
}

.hero-img {
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 16px;
  margin: 22px 0 26px;
  display: block;
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.14);
}

.notice {
  background: #fff7e6;
  border-left: 5px solid #f59e0b;
  padding: 16px 18px;
  border-radius: 12px;
  margin: 24px 0;
  color: #3b2f12;
}

.related {
  margin-top: 34px;
  padding: 24px;
  background: #f1f5f9;
  border-radius: 16px;
  border: 1px solid #e2e8f0;
}

.related h2 {
  margin-top: 0;
  font-size: 22px;
}

.related ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.related li {
  margin: 10px 0;
}

.related a {
  display: block;
  padding: 10px 12px;
  background: #fff;
  border-radius: 10px;
  color: #0b4ea2;
}

.related a:hover {
  background: #eaf2ff;
  text-decoration: none;
}

.site-footer {
  margin-top: 36px;
  background: #071a33;
  color: #dbeafe;
  padding: 26px 0;
  text-align: center;
  font-size: 14px;
}

@media (max-width: 700px) {
  body {
    font-size: 16px;
  }

  .container {
    max-width: 100%;
    padding: 0 14px;
  }

  .article {
    padding: 24px 20px;
    border-radius: 14px;
  }

  h1 {
    font-size: 28px;
  }

  h2 {
    font-size: 22px;
  }

  .logo {
    font-size: 28px;
  }
}