:root{--bk-serif:Georgia,"Times New Roman","Noto Naskh Arabic",serif}.bk-nav{background:var(--navy);color:#fff}.bk-nav-inner{display:flex;align-items:center;gap:4px;padding:0 4%;overflow-x:auto;scrollbar-width:none}.bk-nav-inner::-webkit-scrollbar{display:none}.bk-nav a,.bk-nav button{flex-shrink:0;padding:14px;border:0;border-bottom:3px solid transparent;background:transparent;color:#d5dce7;font-size:14px;font-weight:600;text-decoration:none;white-space:nowrap;transition:color .2s,border-color .2s}.bk-nav a:hover,.bk-nav button:hover{color:#fff}.bk-nav button.active{color:#fff;border-bottom-color:#6aa0ff}.bk-nav-note{margin-left:auto;padding-left:16px;color:#aeb9c9;font-size:12px;white-space:nowrap}.bk-hero{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);align-items:center;grid-gap:24px;gap:24px;margin:20px 4% 0;padding:44px 5%;overflow:hidden;border:1px solid var(--border);border-radius:16px;background:linear-gradient(115deg,var(--blue-light) 0,#f8fbff 55%,#e3edff 100%)}.bk-hero-copy small{display:block;color:var(--primary);font-size:12px;font-weight:800;letter-spacing:1.2px}.bk-hero h1{margin:12px 0 14px;color:var(--navy);font-family:var(--bk-serif);font-size:clamp(34px,5vw,58px);line-height:1.08;letter-spacing:-.5px}.bk-hero h1 span{color:var(--primary)}.bk-hero p{max-width:520px;margin:0;color:#3d4a5c;font-size:16px;line-height:1.7}.bk-hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}.bk-hero-actions .cta{margin-top:0;min-height:48px;padding:12px 26px;font-size:15px}.bk-ghost{min-height:48px;padding:12px 22px;border:1.5px solid var(--primary);border-radius:6px;background:#fff;color:var(--primary);font-size:16px;font-weight:700;transition:background .2s}.bk-ghost:hover{background:var(--blue-light)}.bk-stack{display:flex;flex-direction:column;align-items:flex-end;gap:6px;justify-self:end;width:min(430px,100%)}.bk-spine{display:flex;align-items:center;height:54px;padding:0 22px;border-radius:5px 3px 3px 5px;color:#fff;font-family:var(--bk-serif);font-size:19px;font-weight:700;letter-spacing:1.5px;box-shadow:0 6px 14px rgba(7,17,31,.22),inset -14px 0 0 -9px rgba(255,255,255,.55)}.bk-spine span{opacity:.95}.s1{width:78%;background:linear-gradient(90deg,#0b2a57,#175cd3)}.s2{width:96%;background:linear-gradient(90deg,#4a1d2f,#a23b57);justify-content:flex-end;font-size:24px}.s3{width:86%;background:linear-gradient(90deg,#0f3d3e,#2a7f78)}.s4{width:100%;background:linear-gradient(90deg,#3b2a14,#b9792f);justify-content:flex-end;font-size:22px}.s5{width:82%;background:linear-gradient(90deg,#1f2a44,#5b6fa8)}.bk-wrap{max-width:1280px;margin:0 auto;padding:8px 4% 40px}.bk-heading{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin:34px 0 16px}.bk-heading h2{margin:0;color:var(--navy);font-family:var(--bk-serif);font-size:28px}.bk-heading button{border:0;background:transparent;color:var(--primary);font-size:14px;font-weight:700}.bk-count{color:var(--muted);font-size:14px;font-weight:600}.bk-tiles{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));grid-gap:14px;gap:14px}.bk-tile{display:flex;flex-direction:column;align-items:flex-start;gap:4px;min-height:142px;padding:14px;overflow:hidden;border:1px solid var(--border);border-radius:12px;background:#fff;color:var(--ink);text-align:left;transition:transform .2s,box-shadow .2s,border-color .2s}.bk-tile:hover{transform:translateY(-2px);box-shadow:var(--shadow)}.bk-tile.selected{border-color:var(--primary);box-shadow:0 0 0 2px var(--blue-light)}.bk-tile-art{display:flex;align-items:center;justify-content:center;width:100%;height:62px;margin-bottom:6px;border-radius:8px;font-size:32px}.bk-tile strong{font-size:14px;line-height:1.3}.bk-tile>span:last-child{color:var(--muted);font-size:12px}.bk-tile.bk-tone-0 .bk-tile-art{background:linear-gradient(135deg,#dce8ff,#b7cfff)}.bk-tile.bk-tone-1 .bk-tile-art{background:linear-gradient(135deg,#d9efec,#aedbd5)}.bk-tile.bk-tone-2 .bk-tile-art{background:linear-gradient(135deg,#f6dde3,#e8b4c1)}.bk-tile.bk-tone-3 .bk-tile-art{background:linear-gradient(135deg,#f5e6cf,#e6c590)}.bk-tile.bk-tone-4 .bk-tile-art{background:linear-gradient(135deg,#dfe4f2,#b9c4e2)}.bk-tile.bk-tone-5 .bk-tile-art{background:linear-gradient(135deg,#dcefdf,#b3d9ba)}.bk-filters{flex-wrap:wrap;gap:12px 22px;margin-bottom:18px;padding:12px 14px;border:1px solid var(--border);border-radius:12px;background:#fff}.bk-filters,.bk-group{display:flex;align-items:center}.bk-group{gap:6px}.bk-group>span,.bk-sort>span{margin-right:4px;color:var(--muted);font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.5px}.bk-group button{padding:7px 14px;border:1px solid var(--border);border-radius:20px;background:#fff;color:var(--ink);font-size:13px;font-weight:600;transition:background .2s,color .2s}.bk-group button:hover{background:var(--card)}.bk-group button.active{border-color:var(--primary);background:var(--primary);color:#fff}.bk-sort{display:flex;align-items:center;margin-left:auto}.bk-sort select{padding:8px 10px;border:1px solid var(--border);border-radius:8px;color:var(--ink)}.bk-clear,.bk-sort select{background:#fff;font-size:13px}.bk-clear{padding:8px 14px;border:1px solid var(--border);border-radius:20px;color:var(--primary);font-weight:700}.bk-clear:hover{background:var(--blue-light)}.bk-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));grid-gap:20px;gap:20px}.bk-grid .empty{align-items:flex-start;gap:12px}.bk-card,.bk-grid .empty{display:flex;flex-direction:column}.bk-card{padding:14px;border:1px solid var(--border);border-radius:12px;background:#fff;transition:box-shadow .2s,transform .2s}.bk-card:hover{transform:translateY(-2px);box-shadow:var(--shadow)}.bk-cover-wrap{position:relative;display:flex;align-items:center;justify-content:center;aspect-ratio:2/3;overflow:hidden;border-radius:6px;background:var(--card);box-shadow:0 6px 16px rgba(7,17,31,.16)}.bk-cover-img{width:100%;height:100%;object-fit:cover}.bk-sale{padding:2px 8px;border-radius:12px;background:#fde8e6;color:var(--danger);font-size:11px;font-weight:800}.bk-badges{display:flex;flex-wrap:wrap;gap:6px;margin:12px 0 8px}.bk-badge{padding:3px 9px;border-radius:12px;background:var(--card);color:#3d4a5c;font-size:11px;font-weight:700}.bk-badge.new{background:var(--blue-light);color:var(--primary)}.bk-badge.used{background:#fdf0d9;color:#8a5a10}.bk-card h3{display:-webkit-box;min-height:2.7em;margin:0;overflow:hidden;color:var(--navy);font-size:15px;line-height:1.35;-webkit-line-clamp:2;-webkit-box-orient:vertical}.bk-author{margin:4px 0 0;overflow:hidden;color:var(--muted);font-size:13px;text-overflow:ellipsis;white-space:nowrap}.bk-price-row{display:flex;align-items:baseline;gap:8px;margin:10px 0 2px}.bk-price-row strong{color:var(--navy);font-size:20px}.bk-price-row s{color:var(--muted);font-size:13px}.bk-stock{margin-bottom:10px;color:#067647;font-size:12px;font-weight:700}.bk-stock.low{color:#b54708}.bk-stock.out{color:var(--danger)}.bk-card .add{width:100%;margin-top:auto}.bk-cover{display:flex;flex-direction:column;justify-content:space-between;width:100%;height:100%;padding:18px 14px 14px 20px;color:#fff;text-align:left;box-shadow:inset 8px 0 0 rgba(0,0,0,.2),inset 9px 0 0 rgba(255,255,255,.1)}.bk-cover-title{font-family:var(--bk-serif);font-size:19px;font-weight:700;line-height:1.25;overflow-wrap:anywhere}.bk-cover-author{padding-top:10px;border-top:1px solid rgba(255,255,255,.4);font-size:12px;letter-spacing:.4px;opacity:.92}.bk-cover.compact{padding:4px 4px 4px 7px}.bk-cover.compact .bk-cover-title{display:-webkit-box;overflow:hidden;font-size:9px;line-height:1.2;-webkit-line-clamp:4;-webkit-box-orient:vertical}.bk-cover.bk-tone-0,.bk-tone-0.bk-cover{background:linear-gradient(160deg,#0b2a57,#175cd3)}.bk-cover.bk-tone-1{background:linear-gradient(160deg,#0f3d3e,#2a7f78)}.bk-cover.bk-tone-2{background:linear-gradient(160deg,#4a1d2f,#a23b57)}.bk-cover.bk-tone-3{background:linear-gradient(160deg,#3b2a14,#b9792f)}.bk-cover.bk-tone-4{background:linear-gradient(160deg,#1f2a44,#5b6fa8)}.bk-cover.bk-tone-5{background:linear-gradient(160deg,#173a2a,#4f8f5c)}@media (max-width:1100px){.bk-tiles{grid-template-columns:repeat(4,minmax(0,1fr))}}@media (max-width:860px){.bk-hero{grid-template-columns:1fr;padding:30px 6%}.bk-stack{justify-self:stretch;width:100%}.bk-spine{height:44px;font-size:16px}.bk-tiles{grid-template-columns:repeat(3,minmax(0,1fr))}.bk-sort{margin-left:0}.bk-nav-note{display:none}}@media (max-width:560px){.bk-hero{margin:14px 4% 0}.bk-tiles{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.bk-tile{min-height:124px;padding:10px}.bk-heading h2{font-size:23px}.bk-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.bk-card{padding:10px}.bk-card h3{font-size:14px}.bk-price-row strong{font-size:17px}.bk-group{flex-wrap:wrap}.bk-cover-title{font-size:15px}}