/* I Know My ABC Inc. — static site stylesheet.
   Clean, simple, fast: system fonts, no webfonts, one file for all pages. */
:root {
  --ink: #222222;
  --muted: #5a5a5a;
  --line: #e3e3e3;
  --bg: #ffffff;
  --soft: #f7f5f0;
  --accent: #1a6fb5;
  --accent-dark: #12557f;
  --amazon: #ff9900;
  --ebay: #0064d2;
  /* Live theme colors (measured from the rendered live site, 2026-10-25):
     page-title banners + homepage H1 section share #52567A; the
     Featured Book section is #E9F0F0. */
  --banner-purple: #52567A;
  --section-gray: #E9F0F0;
  --radius: 8px;
  --max: 1100px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
}
a { color: var(--accent); }
a:hover { color: var(--accent-dark); }
img { max-width: 100%; height: auto; }

/* ---------- header ---------- */
.site-header { border-bottom: 1px solid var(--line); background: #fff; }
.header-inner {
  max-width: var(--max); margin: 0 auto; padding: 12px 20px;
  display: flex; align-items: center; gap: 24px; flex-wrap: wrap;
}
.logo img { display: block; height: 100px; width: auto; }
.main-nav { margin-left: auto; }
.main-nav ul { list-style: none; margin: 0; padding: 0; display: flex; gap: 4px; flex-wrap: wrap; }
.main-nav li { position: relative; }
.main-nav a {
  display: block; padding: 10px 14px; text-decoration: none; color: var(--ink);
  font-weight: 600; border-radius: var(--radius);
}
.main-nav a:hover { background: var(--soft); color: var(--accent); }
.main-nav .dropdown > a::after { content: " ▾"; font-size: 0.8em; }
.main-nav .submenu {
  display: none; position: absolute; left: 0; top: 100%; z-index: 50;
  min-width: 260px; background: #fff; border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: 0 8px 24px rgba(0,0,0,.08); padding: 8px 0;
}
.main-nav .submenu li { display: block; }
.main-nav .submenu a { font-weight: 400; padding: 8px 16px; text-transform: uppercase; }
.main-nav .submenu .submenu-heading {
  padding: 8px 16px 4px; font-size: 0.8em; text-transform: uppercase;
  letter-spacing: .05em; color: var(--muted); font-weight: 700;
}
.main-nav li:hover > .submenu, .main-nav li:focus-within > .submenu { display: block; }
/* R3-3: an opened submenu must also show in the desktop horizontal layout
   (touch tablets wider than 900px); the media-query copy below covers phones. */
.main-nav li.submenu-open > .submenu { display: block; }
.main-nav .dropdown-sub { position: relative; }
.main-nav .dropdown-sub > a { display: flex; justify-content: space-between; gap: 12px; }
.main-nav .submenu-level2 { left: 100%; top: 0; }
.main-nav .submenu.flip-left { left: auto; right: 0; }
.main-nav .submenu-level2.flip-left { left: auto; right: 100%; }
.main-nav .dropdown-sub:hover > .submenu-level2, .main-nav .dropdown-sub:focus-within > .submenu-level2 { display: block; }
.menu-toggle {
  display: none; margin-left: auto; border: 1px solid var(--line);
  background: #fff; border-radius: var(--radius); padding: 8px 14px;
  font-size: 16px; cursor: pointer;
}

/* ---------- layout ---------- */
.wrap { max-width: var(--max); margin: 0 auto; padding: 24px 20px 48px; }
.breadcrumb { font-size: 0.9em; color: var(--muted); margin: 0 0 8px; }
.breadcrumb a { text-decoration: none; }
h1 { font-size: 1.9em; line-height: 1.25; margin: 0 0 16px; }
h2 { font-size: 1.4em; margin: 28px 0 10px; }
h3 { font-size: 1.15em; margin: 22px 0 8px; }

/* ---------- product cards / grids ---------- */
.product-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin: 24px 0;
}
.product-card { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: #fff; }
.product-card a { text-decoration: none; color: inherit; }
.product-card img { display: block; width: 100%; aspect-ratio: 1 / 1; object-fit: contain; background: var(--soft); }
.product-card-body { padding: 12px 14px 16px; text-align: center; }
.product-card h3 { font-size: 1em; margin: 0 0 4px; line-height: 1.35; }
.product-card h3 a:hover { color: var(--accent); }
.product-card .subtitle { font-size: 0.88em; color: var(--muted); margin: 0 0 4px; }
.product-card .author { font-size: 0.88em; color: var(--muted); margin: 0; }
.result-count { color: var(--muted); margin: 8px 0 0; }
.pagination { display: flex; gap: 8px; margin: 28px 0 0; flex-wrap: wrap; }
.pagination a, .pagination span {
  border: 1px solid var(--line); border-radius: var(--radius); padding: 6px 14px; text-decoration: none;
}
.pagination span.current { background: var(--accent); color: #fff; border-color: var(--accent); }

/* ---------- product page ---------- */
.pdp { display: grid; grid-template-columns: 420px 1fr; gap: 36px; align-items: start; }
.gallery-main { border: 1px solid var(--line); border-radius: var(--radius); padding: 12px; background: #fff; }
.gallery-main img { display: block; width: 100%; }
.gallery-thumbs { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 10px; }
.gallery-thumbs button {
  border: 1px solid var(--line); border-radius: 6px; padding: 2px; background: #fff; cursor: pointer;
}
.gallery-thumbs button.active { border-color: var(--accent); outline: 2px solid var(--accent); }
.gallery-thumbs img { display: block; width: 64px; height: 64px; object-fit: cover; }
.buy-box { border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; background: var(--soft); }
.buy-box h2 { margin-top: 0; }
.buy-buttons { display: flex; gap: 12px; flex-wrap: wrap; margin: 12px 0; }
.btn {
  display: inline-block; padding: 12px 22px; border-radius: var(--radius);
  font-weight: 700; text-decoration: none; text-align: center;
}
.btn-amazon { background: var(--amazon); color: #111; }
.btn-amazon:hover { color: #111; filter: brightness(0.95); }
.btn-ebay { background: var(--ebay); color: #fff; }
.btn-ebay:hover { color: #fff; filter: brightness(1.1); }
.disclosure { font-size: 0.88em; color: var(--muted); border-top: 1px solid var(--line); margin-top: 16px; padding-top: 12px; }
.unavailable { font-size: 1.1em; font-weight: 700; margin: 12px 0 4px; }
.specs { width: 100%; border-collapse: collapse; margin: 16px 0; }
.specs th, .specs td { border: 1px solid var(--line); padding: 8px 12px; text-align: left; vertical-align: top; }
.specs th { background: var(--soft); width: 32%; }
.product-meta { font-size: 0.92em; color: var(--muted); }
.product-meta a { text-decoration: none; }
.related-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

/* ---------- resource posts / archives ---------- */
.post-list article { border-bottom: 1px solid var(--line); padding: 20px 0; }
.post-list h2 { margin: 0 0 6px; }
.post-list h2 a { text-decoration: none; color: var(--ink); }
.post-list h2 a:hover { color: var(--accent); }
.post-meta { font-size: 0.88em; color: var(--muted); margin: 0 0 8px; }
.download-list { list-style: none; padding: 0; }
.download-list li { margin: 6px 0; }
.download-list a { font-weight: 600; }
.archive-intro { margin-bottom: 8px; }
.sidebar-widget { border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; margin-bottom: 20px; }
.sidebar-widget h3 { margin-top: 0; }
.sidebar-widget ul { list-style: none; padding: 0; margin: 0; }
.sidebar-widget li { margin: 6px 0; }

/* ---------- PDP gallery lightbox (zoom) ---------- */
.gallery-hint { color: var(--muted); font-size: 0.85em; margin: 6px 0 0; }
.lightbox { position: fixed; inset: 0; background: rgba(0, 0, 0, 0.85); display: flex; align-items: center; justify-content: center; z-index: 200; }
.lightbox[hidden] { display: none; }
.lightbox .lb-img { max-width: 90vw; max-height: 90vh; object-fit: contain; background: #fff; }
.lightbox .lb-close { position: absolute; top: 12px; right: 20px; font-size: 2em; background: none; border: none; color: #fff; cursor: pointer; }
.lightbox .lb-prev, .lightbox .lb-next { position: absolute; top: 50%; transform: translateY(-50%); font-size: 2.5em; background: none; border: none; color: #fff; cursor: pointer; padding: 12px; }
.lightbox .lb-prev { left: 8px; }
.lightbox .lb-next { right: 8px; }

/* ---------- footer (live order: icons, nav, copyright) ---------- */
.site-footer { border-top: 1px solid var(--line); background: #222; color: #eee; margin-top: 24px; }
.footer-inner { max-width: var(--max); margin: 0 auto; padding: 32px 20px; text-align: center; }
.social-links { display: flex; gap: 20px; flex-wrap: wrap; justify-content: center; align-items: center; margin: 0 0 16px; }
.privacy-icon { height: 28px; width: auto; vertical-align: middle; margin-right: 6px; }
.social-links a { color: #fff; text-decoration: none; display: inline-flex; align-items: center; }
.social-links svg { width: 28px; height: 28px; fill: #fff; }
.social-fb:hover svg { fill: #1877F2; }
.social-ig:hover svg { fill: #E1306C; }
.social-mail:hover svg { fill: #00B4D8; }
.social-pin:hover svg { fill: #E60023; }
.footer-reviews { margin: 0 0 16px; }
.footer-reviews a { color: #fff; font-weight: 600; text-decoration: none; }
.footer-menus ul { list-style: none; padding: 0; margin: 0; display: flex; gap: 24px; flex-wrap: wrap; justify-content: center; }
.footer-menus li { margin: 6px 0; }
.footer-menus a { text-decoration: none; color: #fff; }
.footer-menus .cookie-settings { color: #9ecfff; }
.copyright { color: #bbb; font-size: 0.9em; margin-top: 20px; }

/* ---------- cookie notice ---------- */
.cookie-notice {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 100;
  background: #222; color: #fff; padding: 14px 20px;
  display: flex; gap: 16px; align-items: center; flex-wrap: wrap;
}
.cookie-notice p { margin: 0; flex: 1; min-width: 240px; }
.cookie-notice a { color: #9ecfff; }
.cookie-notice button {
  border: 0; border-radius: var(--radius); padding: 8px 16px; cursor: pointer; font-size: 15px;
}
.cookie-notice .settings-open { background: var(--accent); color: #fff; }
.cookie-notice .reject { background: #444; color: #fff; }
.cookie-panel {
  display: none; position: fixed; left: 50%; bottom: 90px; transform: translateX(-50%);
  z-index: 101; background: #fff; color: #222; border: 1px solid #ccc;
  border-radius: var(--radius); padding: 20px; max-width: 420px; width: calc(100% - 40px);
  box-shadow: 0 4px 24px rgba(0,0,0,.25);
}
.cookie-panel.open { display: block; }
.cookie-panel h3 { margin-top: 0; }
.cookie-panel label { display: block; margin: 12px 0; font-weight: bold; }
.cookie-panel .panel-done {
  border: 0; border-radius: var(--radius); padding: 8px 16px; cursor: pointer;
  background: var(--accent); color: #fff; font-size: 15px;
}

/* ---------- homepage hero + polish (soft theme, kept) ---------- */
.hero { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin: 8px 0 24px; }
.hero a { display: block; border-radius: var(--radius); overflow: hidden; }
.hero img { display: block; width: 100%; height: 100%; object-fit: cover; background: var(--soft); }

/* ---------- purple page banner (PDP / Bookstore / archive titles) ---------- */
.page-banner { background: var(--banner-purple); color: #fff; text-align: center; padding: 40px 20px; margin: 0 0 24px; width: 100vw; margin-left: calc(50% - 50vw); margin-right: calc(50% - 50vw); }
.page-banner h1 { color: #fff; margin: 0 0 8px; }
.page-banner .breadcrumb { color: rgba(255,255,255,.85); }
.page-banner .breadcrumb a { color: #fff; }
.trails-toggle {
  background: transparent; border: 1px solid rgba(255,255,255,.6); color: #fff;
  border-radius: var(--radius); padding: 4px 14px; cursor: pointer; margin: 8px 0;
}
.more-trails[hidden] { display: none; }
/* ---------- homepage H1 hero section ---------- */
.hero-title { background: var(--banner-purple); color: #fff; text-align: center; padding: 40px 20px; margin: 0 0 24px; width: 100vw; margin-left: calc(50% - 50vw); margin-right: calc(50% - 50vw); }
.hero-title h1 { color: #fff; text-transform: capitalize; margin: 0; }

/* ---------- generic slider (hero, sub-categories, shop-by) ---------- */
.slider { position: relative; overflow: hidden; margin: 8px 0 24px; }
.slider-viewport { overflow: hidden; }
.slider-track { display: flex; transition: transform .45s ease; }
.slider-slide { flex: 0 0 100%; min-width: 0; }
.slider-slide img { display: block; width: 100%; object-fit: contain; background: var(--soft); }
.slider-prev, .slider-next {
  position: absolute; top: 50%; transform: translateY(-50%); z-index: 2;
  border: 0; border-radius: var(--radius); padding: 10px 14px; cursor: pointer;
  background: var(--accent); color: #fff; font-size: 18px;
}
.slider-prev { left: 8px; }
.slider-next { right: 8px; }
.slider-dots { display: flex; gap: 8px; justify-content: center; margin: 12px 0 0; }
.slider-dot { width: 12px; height: 12px; border-radius: 50%; border: 0; background: #ccc; cursor: pointer; padding: 0; }
.slider-dot.active { background: var(--accent); }
.slider .slide-cta { text-align: center; margin: 12px 0 4px; }
.hero-slider .slider-slide { position: relative; }
.hero-slider .slide-cta { position: absolute; left: 63%; bottom: 6%; transform: translateX(-50%); margin: 0; }
.hero-slider .slide-cta a.btn { background: #222; color: #fff; padding: clamp(6px, 1.2vw, 10px) clamp(16px, 3vw, 30px); border-radius: 999px; text-decoration: none; white-space: nowrap; font-size: clamp(0.8rem, 1.6vw, 1rem); }
/* Tile sliders (sub-categories, shop-by): fixed-count pages, no scrollbar. */
.tile-slider .slider-viewport { overflow: hidden; position: relative; }
.tile-slider .slider-track { transition: transform .45s ease; }
.tile-slider .slider-slide { flex: 0 0 25%; padding: 0 8px; }
@media (max-width: 1024px) { .tile-slider .slider-slide { flex-basis: 33.333%; } }
@media (max-width: 640px) { .tile-slider .slider-slide { flex-basis: 50%; } }
.tile-slider .slider-prev, .tile-slider .slider-next { position: absolute; top: 50%; transform: translateY(-50%); z-index: 2; }
.tile-slider .tile {
  display: block; text-align: center; font-weight: 600; text-decoration: none;
  color: var(--ink); background: var(--soft); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 28px 12px;
}
.tile-slider .tile:hover { color: var(--accent); }

/* ---------- featured book (live format: gray section, two columns) ---------- */
.featured { background: var(--section-gray); padding: 32px 20px; margin: 32px 0; }
.featured-inner { max-width: var(--max); margin: 0 auto; display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: center; }
.featured-label { color: var(--muted); font-size: 0.9em; margin: 0 0 6px; }
.featured h3 { font-size: 1.4em; margin: 0 0 6px; }
.featured-publisher { font-style: italic; color: var(--muted); margin: 0 0 12px; }
.featured .btn-dark { background: #222; color: #fff; }
.featured .btn-dark:hover { color: #fff; filter: brightness(1.2); }
.featured img { display: block; width: 100%; object-fit: contain; }
.featured-plain { background: none; padding: 0; }
.featured-plain .featured-inner { max-width: none; }
@media (max-width: 900px) { .featured-inner { grid-template-columns: 1fr; } }
.contact-card { background: var(--soft); border-radius: var(--radius); padding: 28px 32px; margin: 0 0 24px; }

/* ---------- leaving-site modal ---------- */
.leave-modal { position: fixed; inset: 0; z-index: 200; background: rgba(0,0,0,.55); display: flex; align-items: center; justify-content: center; }
.leave-modal[hidden] { display: none; }
.leave-modal-box { background: #fff; border-radius: var(--radius); padding: 24px; max-width: 460px; width: calc(100% - 40px); }
.leave-modal-box button { border: 0; border-radius: var(--radius); padding: 10px 18px; cursor: pointer; font-size: 15px; }
.leave-continue { background: var(--accent); color: #fff; }
.leave-cancel { background: #eee; }
.product-card { transition: box-shadow .15s ease; }
.product-card:hover { box-shadow: 0 8px 24px rgba(0,0,0,.08); }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .product-grid, .related-grid { grid-template-columns: repeat(2, 1fr); }
  .pdp { grid-template-columns: 1fr; }
  .menu-toggle { display: block; }
  .main-nav { display: none; width: 100%; }
  .main-nav.open { display: block; }
  .main-nav ul { flex-direction: column; }
  .main-nav .submenu { position: static; display: none; box-shadow: none; border: 0; padding-left: 16px; }
  .main-nav li.submenu-open > .submenu { display: block; }
}
@media (max-width: 520px) {
  .product-grid, .related-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .hero { grid-template-columns: 1fr; gap: 12px; }
  h1 { font-size: 1.5em; }
  .specs { display: block; overflow-x: auto; }
  .buy-buttons .btn { flex: 1 1 100%; }
}

/* Post images (Tasks 21/22/23) */
.post-featured img { max-width: 100%; height: auto; display: block; margin: 0 auto 16px; }
.post-badges { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.post-badges img { height: 48px; width: auto; }
.downloads img { max-width: 300px; height: auto; display: block; margin: 0 auto 6px; }
.downloads { list-style: none; padding-left: 0; margin: 0 0 24px; }
.downloads li { margin: 0 0 16px; }
.download-image { text-align: left; }
/* R3-9: left-align download previews; the .downloads img rule above centers
   them with margin auto, so the margin must be reset here. */
.download-image img { display: block; max-width: 250px; height: auto; margin: 0 0 6px; }
/* R3-10: floated letter image in learn posts (live uses class alignright). */
img.alignright { float: right; margin: 0 0 12px 16px; }
@media (max-width: 640px) { img.alignright { float: none; display: block; margin: 0 0 12px; } }
.resource-thumb img { max-width: 300px; height: auto; display: block; }