.free-site-layout { width: 100%; }
.free-learning-column { min-width: 0; }
.free-ad-rail { display: flex; flex-wrap: wrap; gap: 24px; justify-content: center; margin: 24px 16px; }
.free-ad-slot { position: relative; flex: 0 0 160px; width: 160px; min-height: 320px; border: 1px solid #d5e1d7; background: #f8fbf7; border-radius: 8px; color: #5a7163; text-align: center; padding: 12px 0; }
.free-ad-slot > span { display: block; font-size: 12px; margin-bottom: 8px; }
.free-ad-unit { min-height: 280px; width: 100%; }
.free-ad-slot small { display: block; padding: 8px; font-size: 11px; }
.free-site-footer, .free-learning-record { max-width: 900px; margin: 24px auto; padding: 16px; line-height: 1.8; }
.free-site-footer { display: flex; gap: 16px; flex-wrap: wrap; }
.free-site-footer a, .free-learning-record a, .free-article a { color: #355f4c; }
.free-learning-record a { display: inline-block; padding: 10px; }
.free-learning-record button { display: block; min-height: 44px; padding: 8px 12px; border: 1px solid #bdccbd; border-radius: 8px; background: #f6faf4; color: #355f4c; }
.free-article { max-width: 900px; margin: 0 auto; padding: 24px; line-height: 1.9; overflow-wrap: anywhere; }
.free-article h1 { font-size: 30px; }
.free-article h2 { margin-top: 32px; }
.free-article nav { display: flex; gap: 16px; flex-wrap: wrap; }
.free-article li { margin: 12px 0; }
@media (min-width: 1728px) {
  .free-site-layout { display: grid; grid-template-columns: 160px minmax(0, 1320px) 160px; column-gap: 24px; justify-content: center; padding: 0 20px; }
  .free-learning-column { grid-column: 2; grid-row: 1; }
  .free-ad-rail { grid-row: 1; display: flex; flex-direction: column; justify-content: flex-start; gap: 120px; margin: 120px 0 24px; }
  .free-ad-left { grid-column: 1; } .free-ad-right { grid-column: 3; }
}
/* Never CSS-hide a requested unit at a breakpoint. Narrow-resized desktop units
   stay in normal document flow below learning, with no overlays or auto refresh. */