:root{--color-primary:#4a90e2;--color-primary-light:#6aa8f0;--color-bg:#f8f9fa;--color-card-bg:#fff;--color-text:#333;--color-text-light:#666;--color-border:#e0e0e0;--color-accent:#ffb74d;--font-family:"Segoe UI",Tahoma,Geneva,Verdana,sans-serif}*,:after,:before{box-sizing:border-box}body{margin:0;font-family:var(--font-family);background-color:var(--color-bg);color:var(--color-text);overflow-x:hidden}.book-card{background-color:var(--color-card-bg);border:1px solid var(--color-border);border-radius:8px;padding:15px;box-shadow:0 2px 4px rgba(0,0,0,.05);transition:box-shadow .2s ease;display:flex;flex-direction:column;gap:6px}.book-card:hover{box-shadow:0 4px 12px rgba(0,0,0,.1)}.btn-buy{background-color:var(--color-primary);color:#fff;border:none;padding:10px 20px;border-radius:5px;cursor:pointer;font-size:16px;font-weight:700;transition:background-color .2s ease}.btn-buy:hover{background-color:var(--color-primary-light)}.btn-buy.free{background-color:var(--color-accent)}.btn-buy.free:hover{background-color:#ffc670}.filter-heading{font-size:13px;font-weight:700;text-transform:uppercase;letter-spacing:.04em;color:var(--color-text-light);margin:0 0 12px}.filter-row{display:flex;align-items:center;gap:9px;padding:5px 0;font-size:14px;color:var(--color-text);cursor:pointer}.filter-row input{accent-color:var(--color-primary);width:16px;height:16px;flex:none}.genre-pill{display:inline-block;align-self:flex-start;font-size:11px;font-weight:700;padding:3px 9px;border-radius:20px;color:#fff;margin:10px 0 8px}.footer-link,.nav-link{color:var(--color-text-light);text-decoration:none;margin-right:15px;transition:color .2s ease}.footer-link:hover,.nav-link:hover{color:var(--color-primary);text-decoration:underline}.intro-block{background-color:var(--color-card-bg);border-left:4px solid var(--color-accent);padding:20px;margin-bottom:40px;border-radius:8px;font-size:18px;line-height:1.6}.footer{margin-top:50px;padding-top:20px;border-top:1px solid var(--color-border);text-align:center;font-size:14px}.catalog-sidebar-toggle{display:none}.catalog-sidebar-toggle::-webkit-details-marker{display:none}.catalog-sidebar-toggle-icon{transition:transform .15s ease;flex:none}.catalog-sidebar[open] .catalog-sidebar-toggle-icon{transform:rotate(180deg)}@media (max-width:900px){.catalog-layout{flex-direction:column!important}.catalog-sidebar{width:100%!important;position:static!important;max-height:none!important;overflow-y:visible!important}.catalog-sidebar-toggle{display:flex;align-items:center;justify-content:space-between;list-style:none;cursor:pointer;font-weight:700;font-size:15px;color:var(--color-text);padding:4px 0}.catalog-sidebar:not([open])>:not(summary){display:none!important}.catalog-sidebar[open]>:not(summary){margin-top:12px}.site-header{flex-direction:column!important;align-items:stretch!important;gap:12px!important}.site-search{max-width:none!important;width:100%!important}.site-nav{width:100%;flex-wrap:wrap;gap:12px 16px!important}}@media (max-width:600px){.book-grid{grid-template-columns:1fr!important}.catalog-layout{padding:16px!important;gap:16px!important}}