:root {
  --yb-primary: #0d5f70;
  --yb-primary-dark: #084956;
  --yb-accent: #e8f4f5;
  --yb-text: #18272c;
  --yb-muted: #617278;
  --yb-line: #dce5e8;
  --yb-surface: #fff;
  --yb-bg: #f5f8f9;
  --yb-danger: #a33a3a;
  --yb-radius: 14px;
}

.yb-books, .yb-books * { box-sizing: border-box; }
.yb-books {
  width: min(1180px, calc(100% - 32px));
  margin: 10px auto 64px;
  color: var(--yb-text);
  font-family: IRANSans, IRANSansX, Tahoma, Arial, sans-serif;
  line-height: 1.75;
  border: solid 1px var(--yb-primary);
  border-radius: 16px;
  padding: 15px;
}
.yb-books button, .yb-books input, .yb-books select { font: inherit; }
.yb-books__intro { max-width: 720px; margin: 0 auto 26px; text-align: center; }
.yb-books__eyebrow { display: inline-block; color: var(--yb-primary); font-size: 13px; font-weight: 700; margin-bottom: 5px; }
.yb-books__intro h1 { margin: 0; font-size: clamp(25px, 4vw, 38px); line-height: 1.45; color: var(--yb-text); }
.yb-books__intro p { margin: 8px 0 0; color: var(--yb-muted); font-size: 15px; }
.yb-search { max-width: 830px; margin: 0 auto 34px; }
.yb-search__bar { display: flex; padding: 6px; background: var(--yb-surface); border: 1px solid var(--yb-line); border-radius: 16px; box-shadow: 0 10px 32px rgba(22, 60, 70, .08); }
.yb-search__bar:focus-within { border-color: var(--yb-primary); box-shadow: 0 0 0 3px rgba(13, 95, 112, .12), 0 10px 32px rgba(22, 60, 70, .08); }
.yb-search__bar input { flex: 1; min-width: 0; height: 50px; padding: 0 16px; border: 0; outline: 0; color: var(--yb-text); background: transparent; }
.yb-search__bar button, .yb-filters__apply { min-width: 112px; border: 0; border-radius: 11px; background: var(--yb-primary); color: #fff; cursor: pointer; font-weight: 700; transition: .18s ease; }
.yb-search__bar button:hover, .yb-filters__apply:hover { background: var(--yb-primary-dark); }
.yb-search__hint { margin: 8px 14px 0; color: var(--yb-muted); font-size: 12px; }
.yb-layout { display: grid; grid-template-columns: 265px minmax(0, 1fr); gap: 24px; align-items: start; }
.yb-filters { position: sticky; top: 24px; padding: 20px; border: 1px solid var(--yb-line); border-radius: var(--yb-radius); background: var(--yb-surface); }
.yb-filters__head { display: flex; justify-content: space-between; gap: 12px; align-items: center; padding-bottom: 13px; border-bottom: 1px solid var(--yb-line); }
.yb-filters__clear { padding: 0; border: 0; background: transparent; color: var(--yb-primary); cursor: pointer; font-size: 12px; }
.yb-filters label { display: grid; gap: 6px; margin-top: 15px; color: var(--yb-muted); font-size: 12px; font-weight: 700; }
.yb-filters select, .yb-filters input { width: 100%; height: 42px; padding: 0 10px; border: 1px solid var(--yb-line); border-radius: 9px; background: #fff; color: var(--yb-text); outline: 0; }
.yb-filters select:focus, .yb-filters input:focus { border-color: var(--yb-primary); box-shadow: 0 0 0 2px rgba(13, 95, 112, .1); }
.yb-filter-years { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.yb-filters__apply { width: 100%; min-height: 43px; margin-top: 20px; }
.yb-results__summary { min-height: 30px; margin-bottom: 10px; color: var(--yb-muted); font-size: 13px; }
.yb-results__status { padding: 30px 18px; border: 1px dashed var(--yb-line); border-radius: var(--yb-radius); text-align: center; color: var(--yb-muted); background: var(--yb-bg); }
.yb-results__status[hidden] { display: none; }
.yb-results__status.is-error { color: var(--yb-danger); border-color: #edcaca; background: #fff8f8; }
.yb-result-card { padding: 22px; margin-bottom: 12px; border: 1px solid var(--yb-line); border-radius: var(--yb-radius); background: var(--yb-surface); transition: border-color .18s ease, transform .18s ease; }
.yb-result-card:hover { border-color: #b7ccd1; transform: translateY(-1px); }
.yb-result-card__top { display: flex; justify-content: space-between; gap: 18px; }
.yb-result-card h2 { margin: 0; color: var(--yb-text); font-size: 18px; line-height: 1.65; }
.yb-result-card__subtitle { margin: 3px 0 0; color: var(--yb-muted); font-size: 13px; }
.yb-result-card__type { flex: 0 0 auto; height: fit-content; padding: 4px 9px; border-radius: 999px; color: var(--yb-primary); background: var(--yb-accent); font-size: 11px; white-space: nowrap; }
.yb-result-card__people { margin: 13px 0 0; font-size: 13px; }
.yb-result-card__people p { margin: 3px 0; }
.yb-result-card__people span { color: var(--yb-muted); }
.yb-result-card__meta { display: flex; flex-wrap: wrap; gap: 7px 16px; margin: 15px 0 0; padding-top: 13px; border-top: 1px solid var(--yb-line); color: var(--yb-muted); font-size: 12px; }
.yb-result-card__meta a { color: var(--yb-primary); text-decoration: none; direction: ltr; unicode-bidi: plaintext; }
.yb-result-card__subjects { margin: 10px 0 0; color: var(--yb-muted); font-size: 12px; }
.yb-result-card__cart { display: inline-flex; align-items: center; justify-content: center; min-height: 34px; margin: 14px 0 0; padding: 6px 12px; border: 1px solid var(--yb-primary); border-radius: 8px; color: #fff; background: var(--yb-primary); cursor: pointer; font-size: 12px; font-weight: 700; line-height: 1; text-decoration: none !important; transition: background .18s ease, border-color .18s ease, transform .18s ease; }
.yb-result-card__cart:hover, .yb-result-card__cart:has(input:checked):hover { border-color: var(--yb-primary-dark); background: var(--yb-primary-dark); color: #fff; transform: translateY(-1px); }
.yb-result-card__cart:has(input:checked) { border-color: var(--yb-primary); background: var(--yb-primary); color: #fff; }
.yb-result-card__cart--view { border-color: #16865a; background: #16865a; color: #fff; }
.yb-result-card__cart--view:hover { border-color: #0f6d49; background: #0f6d49; color: #fff; }
.yb-result-card__cart input.addtocart, .yb-result-card__cart input.addtocart:checked { position: absolute !important; width: 0 !important; height: 0 !important; margin: 0 !important; padding: 0 !important; border: 0 !important; opacity: 0 !important; visibility: hidden !important; appearance: none !important; -webkit-appearance: none !important; pointer-events: none !important; }
.yb-result-card__cart:focus-within { outline: 3px solid rgba(13, 95, 112, .25); outline-offset: 2px; }
body > input.addtocart[value^="ebook#"] { position: fixed !important; top: -9999px !important; left: -9999px !important; width: 0 !important; height: 0 !important; margin: 0 !important; padding: 0 !important; border: 0 !important; opacity: 0 !important; visibility: hidden !important; appearance: none !important; -webkit-appearance: none !important; pointer-events: none !important; z-index: -1 !important; }
.yb-pagination { display: flex; align-items: center; justify-content: center; gap: 12px; margin-top: 24px; }
.yb-pagination button { padding: 8px 15px; border: 1px solid var(--yb-line); border-radius: 9px; background: #fff; color: var(--yb-text); cursor: pointer; }
.yb-pagination button:disabled { opacity: .45; cursor: default; }
.yb-pagination__label { color: var(--yb-muted); font-size: 12px; }
.yb-skeleton { height: 150px; margin-bottom: 12px; border-radius: var(--yb-radius); background: linear-gradient(90deg, #edf2f3 25%, #f8fafb 40%, #edf2f3 65%); background-size: 400% 100%; animation: yb-shimmer 1.35s infinite; }
.yb-sr-only { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
@keyframes yb-shimmer { from { background-position: 100% 0; } to { background-position: 0 0; } }

@media (max-width: 760px) {
  .yb-books { width: min(100% - 22px, 680px); margin-top: 26px; }
  .yb-layout { grid-template-columns: 1fr; }
  .yb-filters { position: static; }
  .yb-search__bar { padding: 5px; }
  .yb-search__bar input { height: 46px; padding: 0 11px; font-size: 13px; }
  .yb-search__bar button { min-width: 82px; font-size: 13px; }
  .yb-result-card { padding: 17px; }
  .yb-result-card__top { display: grid; gap: 8px; }
  .yb-result-card__type { justify-self: start; }
}