* {
   box-sizing: border-box;
}

body {
   margin: 0;
   font-family: Arial, Helvetica, sans-serif;
   font-size: 16px;
   line-height: 1.6;
   color: #222;
   background: #f4f4f4;
}

img {
   max-width: 100%;
   height: auto;
}

.container {
   width: min(1100px, calc(100% - 32px));
   margin: 0 auto;
}

.site-header {
   background: #fff;
   border-bottom: 1px solid #ddd;
}

.header-inner {
   display: flex;
   align-items: center;
   justify-content: space-between;
   gap: 20px;
   padding: 20px 0;
}

.logo {
   display: block;
   max-width: 260px;
}

.strapline {
   margin: 0;
   font-size: 1.1rem;
   font-weight: bold;
   color: #333;
}

.main-nav {
   background: #333;
}

.nav-inner {
   display: flex;
   flex-wrap: wrap;
   gap: 0;
}

.main-nav a {
   display: block;
   padding: 12px 18px;
   color: #fff;
   text-decoration: none;
}

.main-nav a:hover,
.main-nav a:focus {
   background: #555;
}

.page-layout {
   display: grid;
   grid-template-columns: minmax(0, 1fr) 280px;
   gap: 30px;
   padding: 30px 0;
}

.main-content,
.sidebar {
   background: #fff;
}

.main-content {
   padding: 30px;
}

.sidebar {
   align-self: start;
   padding: 20px;
}

h1,
h2 {
   line-height: 1.25;
   margin-top: 0;
}

h1 {
   font-size: clamp(1.8rem, 4vw, 2.6rem);
}

h2 {
   font-size: 1.35rem;
   margin-top: 30px;
}

.content-image {
   float: right;
   width: 320px;
   margin: 8px 0 20px 24px;
   border-radius: 6px;
}

ul {
   padding-left: 22px;
}

li {
   margin-bottom: 8px;
}

.highlight {
   padding: 18px;
   margin-bottom: 20px;
   border: 1px solid #ddd;
   background: #f7f7f7;
}

.highlight h2 {
   margin: 0 0 8px;
   font-size: 1.1rem;
}

.highlight p {
   margin: 0;
}

.site-footer {
   padding: 20px 0;
   text-align: center;
   font-size: 0.9rem;
   color: #555;
   background: #fff;
   border-top: 1px solid #ddd;
}

.site-footer p {
   margin: 0;
}

@media (max-width: 800px) {
   .header-inner {
      flex-direction: column;
      align-items: flex-start;
   }

   .nav-inner {
      flex-direction: column;
   }

   .main-nav a {
      border-top: 1px solid rgba(255,255,255,0.15);
   }

   .page-layout {
      grid-template-columns: 1fr;
      gap: 20px;
      padding: 20px 0;
   }

   .main-content,
   .sidebar {
      padding: 20px;
   }

   .content-image {
      float: none;
      display: block;
      width: 100%;
      margin: 20px 0;
   }
}