* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.7;
  color: #222;
  background: #f7f7f7;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  background: #111;
  color: #fff;
}

.header-inner,
.footer-inner,
.site-wrapper {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 64px;
}

.site-logo {
  font-weight: 700;
  font-size: 20px;
}

.site-nav a,
.footer-nav a {
  margin-left: 16px;
  font-size: 14px;
}

.main-content {
  padding: 32px 0;
}

.page-container,
.article-container,
.tool-container {
  background: #fff;
  padding: 32px;
  border-radius: 14px;
}

h1 {
  font-size: 30px;
  line-height: 1.3;
  margin-top: 0;
}

h2 {
  margin-top: 40px;
  font-size: 22px;
}

.lead {
  font-size: 17px;
  color: #555;
}

.breadcrumb {
  font-size: 13px;
  color: #666;
  margin-bottom: 20px;
}

.breadcrumb a {
  color: #333;
}

.ad-box {
  margin: 32px 0;
  padding: 16px;
  background: #f2f2f2;
  text-align: center;
}

.affiliate-box {
  margin: 40px 0;
  padding: 24px;
  border: 1px solid #ddd;
  border-radius: 12px;
  background: #fafafa;
  text-align: center;
}

.affiliate-label {
  font-weight: 700;
  margin-bottom: 12px;
}

.affiliate-button {
  display: inline-block;
  padding: 12px 24px;
  background: #111;
  color: #fff;
  border-radius: 8px;
  font-weight: 700;
}

.related-links {
  margin-top: 40px;
}

.related-links ul {
  padding-left: 20px;
}

.site-footer {
  margin-top: 48px;
  padding: 32px 0;
  background: #111;
  color: #fff;
  font-size: 14px;
}