/* Shop pages. Builds on /calculator/styles.css. */
main.shop { max-width: 1120px; }

/* Image slider: used on the storefront cards and the product page */
.slider { position: relative; background: var(--surface); border: 1px solid var(--border); border-radius: 12px; overflow: hidden; }
.slider .track { display: flex; transition: transform 0.35s ease; }
.slider .track img { flex: 0 0 100%; width: 100%; height: auto; aspect-ratio: 16 / 10; object-fit: cover; display: block; }
.slider .arrow { position: absolute; top: 50%; transform: translateY(-50%); width: 40px; height: 40px; border-radius: 50%; border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.92); color: var(--heading); font-size: 1.3rem; line-height: 1; cursor: pointer; display: grid; place-items: center;
  box-shadow: 0 2px 8px rgba(30, 42, 50, 0.15); }
.slider .arrow:hover { background: #fff; color: var(--brand); }
.slider .arrow:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }
.slider .prev { left: 10px; }
.slider .next { right: 10px; }
.slider .count { position: absolute; right: 10px; bottom: 10px; background: rgba(30, 42, 50, 0.7); color: #fff; font-size: 0.8rem; padding: 2px 8px; border-radius: 10px; }

/* Storefront */
.shop-intro { margin: 8px 0 24px; }
.products { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 24px; }
.product-card { background: var(--surface); border: 1px solid var(--border); border-radius: 14px; overflow: hidden; display: flex; flex-direction: column; }
.product-card .slider { border: 0; border-radius: 0; border-bottom: 1px solid var(--border); }
.product-card .details { padding: 16px 18px 18px; display: flex; flex-direction: column; gap: 6px; flex: 1; }
.product-card h2 { margin: 0; font-size: 1.15rem; }
.product-card h2 a { color: var(--heading); text-decoration: none; }
.product-card h2 a:hover { color: var(--brand); }
.product-card .meta { color: var(--muted); font-size: 0.9rem; margin: 0; }
.product-card .bottom { display: flex; justify-content: space-between; align-items: center; margin-top: auto; padding-top: 10px; }
.price { font-size: 1.3rem; font-weight: 600; color: var(--heading); }

/* Product page */
.crumbs { font-size: 0.9rem; color: var(--muted); margin: 0 0 16px; }
.crumbs a { color: var(--muted); }
.product { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(280px, 1fr); gap: 32px; align-items: start; }
.thumbs { display: grid; grid-template-columns: repeat(auto-fill, minmax(52px, 1fr)); gap: 8px; margin-top: 10px; }
.thumbs button { padding: 0; border: 2px solid transparent; border-radius: 8px; overflow: hidden; background: var(--surface); cursor: pointer; opacity: 0.65; }
.thumbs button:hover { opacity: 1; }
.thumbs button[aria-current="true"] { border-color: var(--brand); opacity: 1; }
.thumbs img { display: block; width: 100%; height: auto; aspect-ratio: 16 / 10; object-fit: cover; }
.buy-panel { position: sticky; top: 16px; background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 22px; }
.buy-panel h1 { margin: 0 0 6px; font-size: 1.6rem; line-height: 1.25; }
.buy-panel .price { font-size: 1.8rem; margin: 10px 0 14px; display: block; }
.buy-panel .button-link { display: block; text-align: center; font-size: 1.05rem; padding: 14px 20px; }
.buy-panel ul { list-style: none; padding: 0; margin: 16px 0 0; font-size: 0.95rem; }
.buy-panel li { padding: 6px 0 6px 26px; position: relative; border-top: 1px solid var(--border); }
.buy-panel li::before { content: "✓"; position: absolute; left: 4px; color: var(--brand); font-weight: 600; }
.description { margin-top: 28px; }
.description h2 { margin: 0 0 8px; }
.faq details { border-top: 1px solid var(--border); padding: 12px 0; }
.faq summary { cursor: pointer; font-weight: 600; color: var(--heading); }
.faq p { margin: 8px 0 0; }
.todo { background: var(--warn-bg); border-radius: 4px; padding: 0 4px; }

@media (max-width: 820px) {
  .product { grid-template-columns: 1fr; gap: 20px; }
  .buy-panel { position: static; }
  .gallery-col { display: contents; }
  .gallery-col .gallery { order: 1; }
  .buy-panel { order: 2; }
  .description { order: 3; margin-top: 0; }
}

/* Full-screen image viewer */
.viewer { width: 100vw; height: 100vh; max-width: none; max-height: none; margin: 0; padding: 0; border: 0; background: rgba(15, 20, 24, 0.94); }
.viewer::backdrop { background: rgba(15, 20, 24, 0.94); }
.viewer[open] { display: grid; place-items: center; }
.viewer img { max-width: calc(100vw - 140px); max-height: calc(100vh - 80px); width: auto; height: auto; border-radius: 6px; box-shadow: 0 8px 40px rgba(0, 0, 0, 0.5); }
.viewer .arrow, .viewer .close { position: fixed; width: 48px; height: 48px; border-radius: 50%; border: 0; background: rgba(255, 255, 255, 0.92);
  color: var(--heading); font-size: 1.6rem; line-height: 1; cursor: pointer; display: grid; place-items: center; }
.viewer .arrow:hover, .viewer .close:hover { background: #fff; color: var(--brand); }
.viewer .prev { left: 20px; top: 50%; transform: translateY(-50%); }
.viewer .next { right: 20px; top: 50%; transform: translateY(-50%); }
.viewer .close { top: 16px; right: 20px; }
.viewer .count { position: fixed; bottom: 18px; left: 50%; transform: translateX(-50%); color: #fff; font-size: 0.9rem; }
@media (max-width: 640px) {
  .viewer img { max-width: 100vw; border-radius: 0; }
  .viewer .prev { left: 8px; } .viewer .next { right: 8px; }
  .viewer .arrow { width: 40px; height: 40px; top: auto; bottom: 10px; transform: none; }
}

/* Free vs full comparison */
.compare { width: 100%; border-collapse: collapse; background: var(--surface); border: 1px solid var(--border); border-radius: 12px; overflow: hidden; font-size: 0.95rem; }
.compare th, .compare td { padding: 10px 14px; border-bottom: 1px solid var(--border); text-align: left; }
.compare tbody tr:last-child th, .compare tbody tr:last-child td { border-bottom: 0; }
.compare thead th { background: var(--page); color: var(--heading); font-weight: 600; vertical-align: bottom; }
.compare thead th small { font-weight: 400; color: var(--muted); }
.compare tbody th { font-weight: 500; color: var(--text); }
.compare td:last-child, .compare thead th:last-child { background: rgba(15, 94, 90, 0.06); color: var(--heading); font-weight: 600; }
.compare .plus { color: var(--brand); font-weight: 600; }
.compare-link { display: block; text-align: center; margin-top: 10px; font-size: 0.9rem; color: var(--brand); }
.compare-strip { margin-top: 40px; }
.compare-strip h2 { font-size: 1.5rem; }
.compare-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 24px; }
.compare-grid h3 { margin: 0 0 8px; }
.deck-note { margin: -6px 0 18px; color: var(--muted); }
.deck-note a { color: var(--brand); font-weight: 500; }
.compare .yes { color: var(--brand); font-size: 1.1rem; font-weight: 700; }
.compare .no { color: var(--muted); }
.planner-box { margin-top: 18px; padding-top: 16px; border-top: 1px solid var(--border); }
.planner-box p { margin: 0 0 10px; font-size: 0.92rem; }
.planner-box .button-secondary { display: block; text-align: center; }
.compare tr.key th, .compare tr.key td { font-weight: 600; }
.compare tr.key td .no { color: var(--error); font-weight: 500; }
.sample-button { display: block; text-align: center; margin-top: 10px; }
.sample-note { margin: 6px 0 0; font-size: 0.82rem; color: var(--muted); text-align: center; }
.sample-link { align-self: flex-end; font-size: 0.9rem; color: var(--brand); font-weight: 500; text-decoration: none; margin-top: 6px; }
.sample-link:hover { text-decoration: underline; }
.practicals-note { margin: 10px 0 0; font-size: 0.82rem; color: var(--muted); }
.proof { margin: 6px 0 0; font-size: 0.88rem; color: var(--muted); }

/* Free GCSE decks */
.gcse { margin-top: 40px; }
.gcse-list { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 10px; }
.gcse-list li { background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 12px 16px; display: flex; flex-wrap: wrap; gap: 4px 10px; align-items: baseline; }
.gcse-list a { color: var(--heading); text-decoration: none; }
.gcse-list a:hover { color: var(--brand); text-decoration: underline; }
.gcse-list .board { color: var(--muted); font-size: 0.9rem; }
.gcse-list .dl { margin-left: auto; color: var(--brand); font-size: 0.85rem; font-weight: 500; }
.gcse-line { margin: 20px 0 0; padding: 14px 18px; background: var(--surface); border: 1px solid var(--border); border-radius: 12px; }
.gcse-line a { color: var(--brand); font-weight: 500; }

/* Reviews */
.review-list { display: flex; flex-direction: column; gap: 12px; margin-top: 12px; }
.review { margin: 0; background: var(--surface); border: 1px solid var(--border); border-left: 4px solid var(--brand); border-radius: 10px; padding: 14px 16px; display: flex; flex-direction: column; justify-content: space-between; gap: 10px; }
.review blockquote { margin: 0; color: var(--heading); line-height: 1.5; }
.review figcaption { font-size: 0.8rem; color: var(--muted); }
.home-reviews { margin-top: 40px; }
.more-decks { margin: 32px 0 0; color: var(--muted); font-size: 0.92rem; }
.more-decks a { color: var(--brand); font-weight: 500; }
.share-buttons { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 10px; }
.share-buttons .button-secondary { font: inherit; font-weight: 500; cursor: pointer; }