:root{--color-bg:#fff;--color-surface:#f7f7f5;--color-text:#1a1a18;--color-muted:#6b6b66;--color-border:#e2e2dd;--color-placeholder:#efefea;--color-accent:#1c4f8b;--color-accent-hover:#143a68;--color-danger:#a3271f;--color-success:#1f6b3f;--color-warning-bg:#fdf6e3;--color-warning-border:#e8d9a8;--radius:6px;--shell:1120px;--font-sans:system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans Bengali", "Hind Siliguri", sans-serif;--font-mono:ui-monospace, "SF Mono", Menlo, Consolas, monospace;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial;--color-bg:#16161a;--color-surface:#1e1e23;--color-text:#ececea;--color-muted:#a0a09a;--color-border:#32323a;--color-placeholder:#26262c;--color-accent:#7fb0f0;--color-accent-hover:#a8c9f6;--color-danger:#f08f87;--color-success:#77c795;--color-warning-bg:#2b2618;--color-warning-border:#4a4128}}*,:before,:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{background:var(--color-bg);color:var(--color-text);font-family:var(--font-sans);flex-direction:column;min-height:100vh;margin:0;font-size:16px;line-height:1.6;display:flex}img{max-width:100%}a{color:var(--color-accent);text-underline-offset:2px;text-decoration-thickness:1px}a:hover{color:var(--color-accent-hover)}h1,h2,h3{letter-spacing:-.01em;margin:0 0 .5em;font-weight:650;line-height:1.25}h1{font-size:clamp(1.5rem,1.1rem + 1.6vw,2.125rem)}h2{text-transform:uppercase;letter-spacing:.06em;color:var(--color-muted);font-size:1.1rem;font-weight:600}p{margin:0 0 1em}.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:20px}main.shell{flex:1;padding-block:28px 56px}.muted{color:var(--color-muted)}.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}.visually-hidden{clip-path:inset(50%);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}.link-muted{color:var(--color-muted);font-size:.9rem}.site-header{border-bottom:1px solid var(--color-border);background:var(--color-surface)}.site-header__inner{flex-wrap:wrap;align-items:center;gap:12px 20px;padding-block:12px;display:flex}.site-header__brand{color:var(--color-text);letter-spacing:-.01em;font-size:1.05rem;font-weight:700;text-decoration:none}.site-header__nav{gap:16px;font-size:.95rem;display:flex}.site-search{flex:260px;gap:6px;max-width:420px;margin-left:auto;display:flex}.site-search input{border:1px solid 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var(--color-border)}.book__thumbs{gap:8px;margin-top:12px;display:flex}.book__title-bn{color:var(--color-text);margin-top:-.35em;font-size:1.25rem}.book__byline{font-size:1.05rem}.book__summary{color:var(--color-muted);border-left:3px solid var(--color-border);padding-left:14px;font-size:1.05rem}.book__identifiers,.book__facts,.book__subjects{margin-top:28px}dl{gap:2px;margin:0;display:grid}.row{border-bottom:1px solid var(--color-border);grid-template-columns:190px minmax(0,1fr);gap:12px;padding:7px 0;display:grid}@media (max-width:520px){.row{grid-template-columns:minmax(0,1fr);gap:0}}.row dt{color:var(--color-muted);font-size:.9rem}.row dd{overflow-wrap:anywhere;margin:0}.chips{flex-wrap:wrap;gap:8px;margin:0;padding:0;list-style:none;display:flex}.chips a{border:1px solid var(--color-border);background:var(--color-surface);border-radius:999px;padding:3px 11px;font-size:.875rem;text-decoration:none;display:inline-block}.book__actions{flex-wrap:wrap;align-items:center;gap:12px;margin-top:28px;display:flex}.button{border-radius:var(--radius);background:var(--color-accent);color:#fff;border:1px solid var(--color-accent);cursor:pointer;font-weight:550;font:inherit;padding:9px 18px;font-weight:550;text-decoration:none;display:inline-block}.button:hover{background:var(--color-accent-hover);color:#fff}.button--secondary{color:var(--color-accent);background:0 0}.button--secondary:hover{background:var(--color-surface);color:var(--color-accent-hover)}.book__description{max-width:72ch;margin-top:40px}.related{margin-top:40px}.related__list{gap:6px;margin:0;padding:0;list-style:none;display:grid}.card-grid{grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:28px 20px;margin:0;padding:0;list-style:none;display:grid}.card__link{color:inherit;text-decoration:none;display:block}.card__cover{border-radius:var(--radius);border:1px solid var(--color-border)}.card__title{margin-top:8px;font-weight:600;line-height:1.35;display:block}.card__link:hover .card__title{color:var(--color-accent);text-decoration:underline}.card__title-bn{margin:2px 0 0;font-size:.9rem}.card__meta{color:var(--color-muted);margin:2px 0 0;font-size:.85rem}.card__isbn{color:var(--color-muted);margin:6px 0 0;font-size:.8rem}.card__isbn span{font-family:var(--font-mono)}.pagination{font-variant-numeric:tabular-nums;flex-wrap:wrap;align-items:center;gap:10px;margin-top:36px;display:flex}.pagination__current{font-weight:700}.hero{max-width:68ch;padding-block:8px 32px}.hero__search{gap:8px;margin-top:18px;display:flex}.hero__search input{border:1px solid var(--color-border);border-radius:var(--radius);background:var(--color-bg);min-width:0;color:inherit;font-size:1.05rem;font-family:var(--font-mono);flex:1;padding:11px 14px}.tiles{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px;margin:0;padding:0;list-style:none;display:grid}.tile{border:1px solid var(--color-border);border-radius:var(--radius);background:var(--color-surface);padding:14px 16px}.tile a{font-weight:600;text-decoration:none}.tile p{color:var(--color-muted);margin:4px 0 0;font-size:.875rem}.prose{max-width:72ch}.prose h2{text-transform:none;letter-spacing:-.01em;color:var(--color-text);margin-top:1.8em;font-size:1.3rem}.prose ul{padding-left:1.2em}.prose li{margin-bottom:.35em}.form{max-width:820px}.form fieldset{border:1px solid var(--color-border);border-radius:var(--radius);margin:0 0 24px;padding:18px 20px 4px}.form legend{padding-inline:8px;font-size:.95rem;font-weight:650}.field{margin-bottom:18px}.field label{margin-bottom:4px;font-size:.9rem;font-weight:550;display:block}.field input,.field select,.field textarea{border:1px solid var(--color-border);border-radius:var(--radius);background:var(--color-bg);width:100%;color:inherit;font:inherit;padding:8px 11px}.field textarea{resize:vertical;min-height:120px}.field__hint{color:var(--color-muted);margin-top:4px;font-size:.8rem;display:block}.field__error{color:var(--color-danger);margin-top:4px;font-size:.85rem;display:block}.field--invalid input,.field--invalid select,.field--invalid textarea{border-color:var(--color-danger)}.field-grid{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:0 20px;display:grid}.checkbox-grid{grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:6px;margin-bottom:18px;display:grid}.checkbox-grid label{align-items:center;gap:8px;font-size:.9rem;font-weight:400;display:flex}.checkbox-grid input{width:auto}.notice{border:1px solid var(--color-border);border-radius:var(--radius);background:var(--color-surface);border-left-width:4px;margin-bottom:22px;padding:12px 16px}.notice--error{border-left-color:var(--color-danger)}.notice--warning{border-left-color:var(--color-warning-border);background:var(--color-warning-bg)}.notice--success{border-left-color:var(--color-success)}.notice ul{margin:6px 0 0;padding-left:1.2em}.table-wrap{overflow-x:auto}table{border-collapse:collapse;width:100%;font-size:.875rem}th,td{text-align:left;border-bottom:1px solid var(--color-border);white-space:nowrap;padding:7px 10px}th{color:var(--color-muted);font-weight:600}.pass{color:var(--color-success);font-weight:600}.fail{color:var(--color-danger);font-weight:600}