/* স্পেশাল বই — books.html (list) + book.html (reader). Uses the tokens from style.css. No letter-spacing on Bangla. */

/* ---------- cover (CSS + inline SVG motif, used on the list, the reader and the printed first page) ---------- */
.bk-cover{position:relative;aspect-ratio:3/4;border-radius:6px 14px 14px 6px;overflow:hidden;color:#fff;
  background:linear-gradient(150deg,var(--c1,#011835) 0%,var(--c1,#011835) 38%,var(--c2,#0050ed) 100%);
  box-shadow:inset 7px 0 0 rgba(255,255,255,.08),inset 9px 0 12px rgba(0,0,0,.25),0 18px 40px rgba(1,24,53,.28);
  display:flex;flex-direction:column;padding:8% 9% 7% 13%;isolation:isolate}
.bk-cover::before{content:"";position:absolute;inset:0 auto 0 0;width:5%;background:linear-gradient(90deg,rgba(0,0,0,.28),rgba(255,255,255,.06) 70%,transparent);z-index:2}
.bk-cover .bc-motif{position:absolute;inset:0;width:100%;height:100%;z-index:-1;opacity:.9}
.bk-cover .bc-logo{height:auto;width:46%;max-width:150px;filter:drop-shadow(0 2px 6px rgba(0,0,0,.25))}
.bk-cover .bc-kind{align-self:flex-start;margin-top:auto;font-size:.72em;font-weight:600;padding:.28em .8em;border-radius:99px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.28);backdrop-filter:blur(4px)}
.bk-cover .bc-title{font-family:'Noto Serif Bengali',var(--serif);font-weight:700;font-size:1.55em;line-height:1.3;margin:.45em 0 .3em;text-shadow:0 2px 14px rgba(0,0,0,.3)}
.bk-cover .bc-sub{font-size:.74em;line-height:1.55;opacity:.86}
.bk-cover .bc-foot{margin-top:1.1em;padding-top:.8em;border-top:1px solid rgba(255,255,255,.22);font-size:.66em;display:flex;justify-content:space-between;gap:8px;opacity:.85}
.bk-cover .bc-gold{position:absolute;right:7%;top:6.5%;width:15%;aspect-ratio:1;border-radius:50%;background:radial-gradient(circle at 35% 30%,#ffe6a3,#d4a443 55%,#9c7424);box-shadow:0 4px 10px rgba(0,0,0,.3);display:grid;place-items:center;color:#4a3510;font-weight:800;font-size:.62em;text-align:center;line-height:1.15}

/* ---------- books.html ---------- */
.bks-head{background:linear-gradient(160deg,var(--navy) 0%,var(--navy2) 60%,#0050ed 130%);color:#fff;padding:64px 0 56px;position:relative;overflow:hidden}
.bks-head h1{font-family:'Noto Serif Bengali',var(--serif);font-size:clamp(2rem,4.4vw,3.1rem);line-height:1.25;color:#fff}
.bks-head p{max-width:640px;opacity:.86;margin-top:12px;font-size:1.08rem;line-height:1.75}
.bks-head .crumbs a,.bks-head .crumbs span{color:rgba(255,255,255,.75)}
.bks-head .bks-art{position:absolute;right:-40px;top:-20px;width:420px;opacity:.16;pointer-events:none}
.bks-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:34px;padding:48px 0 72px}
.bks-card{display:flex;flex-direction:column;gap:16px;color:inherit}
.bks-card .bk-cover{font-size:clamp(15px,1.25vw,18px);transition:transform .35s cubic-bezier(.2,.7,.2,1),box-shadow .35s}
.bks-card:hover .bk-cover{transform:translateY(-6px) rotate(-1deg);box-shadow:inset 7px 0 0 rgba(255,255,255,.08),inset 9px 0 12px rgba(0,0,0,.25),0 28px 56px rgba(1,24,53,.34)}
.bks-meta h3{font-size:1.15rem;line-height:1.45;color:var(--ink)}
.bks-meta p{color:var(--mut);font-size:.94rem;line-height:1.6;margin-top:4px}
.bks-tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}
.bks-tag{font-size:.8rem;padding:3px 10px;border-radius:99px;background:var(--soft2);color:var(--mut);display:inline-flex;align-items:center;gap:5px}
.bks-tag.free{background:var(--green-soft);color:var(--green)}
.bks-tag.lock{background:var(--gold-soft);color:var(--gold)}
.bks-tag .i{width:14px;height:14px}
.bks-note{border:1px dashed var(--line2);border-radius:var(--r);padding:18px 20px;color:var(--mut);font-size:.95rem;line-height:1.7;margin-bottom:64px;display:flex;gap:12px}

/* ---------- reader shell ---------- */
body[data-page="book"]{background:var(--bg)}
.bk-wm{position:fixed;inset:0;pointer-events:none;z-index:0;background:url("img/brand/mark.png") center 58%/min(46vw,420px) no-repeat;opacity:.045}
:root[data-theme="dark"] .bk-wm{background-image:url("img/brand/mark-dark.png");opacity:.06}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .bk-wm{background-image:url("img/brand/mark-dark.png");opacity:.06}}
.bk-shell{position:relative;z-index:1;display:grid;grid-template-columns:300px minmax(0,1fr);max-width:1240px;margin:0 auto;min-height:70vh}
.bk-side{position:sticky;top:72px;height:calc(100vh - 72px);overflow:auto;border-right:1px solid var(--line);padding:22px 18px 40px;background:color-mix(in srgb,var(--bg) 92%,transparent)}
.bk-side .bs-book{display:flex;gap:12px;align-items:center;margin-bottom:18px}
.bk-side .bs-book .bk-cover{width:58px;flex:none;font-size:4px;padding:0;box-shadow:0 4px 10px rgba(1,24,53,.25)}
.bk-side .bs-book .bk-cover > :not(.bc-motif){display:none}
.bk-side .bs-book b{display:block;color:var(--ink);font-size:.98rem;line-height:1.4}
.bk-side .bs-book small{color:var(--mut);font-size:.8rem}
.bk-toc{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:2px}
.bk-toc a{display:flex;gap:10px;align-items:flex-start;padding:9px 10px;border-radius:10px;color:var(--txt);font-size:.93rem;line-height:1.45}
.bk-toc a:hover{background:var(--soft)}
.bk-toc a.on{background:var(--brand-soft);color:var(--brand-ink);font-weight:600}
.bk-toc .n{flex:none;width:26px;height:26px;border-radius:8px;display:grid;place-items:center;background:var(--soft2);font-size:.8rem;font-weight:700;color:var(--mut)}
.bk-toc a.on .n{background:var(--brand);color:#fff}
.bk-toc .i{width:15px;height:15px;margin-left:auto;flex:none;color:var(--faint);margin-top:3px}
.bk-toc a.soon{opacity:.55;pointer-events:none}

.bk-main{min-width:0;padding:0 40px 80px}
.bk-scrim{display:none}
.bk-bar{position:sticky;top:72px;z-index:5;display:flex;gap:8px;align-items:center;padding:12px 0;background:color-mix(in srgb,var(--bg) 90%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);margin-bottom:28px}
.bk-bar .bb-btn{height:38px;min-width:38px;padding:0 10px;border-radius:10px;border:1px solid var(--line);background:var(--card);color:var(--txt);display:inline-flex;align-items:center;justify-content:center;gap:6px;font-size:.88rem;cursor:pointer}
.bk-bar .bb-btn:hover{border-color:var(--brand);color:var(--brand)}
.bk-bar .bb-btn .i{width:17px;height:17px}
.bk-bar .bb-menu{display:none}
.bk-search{flex:1;position:relative;max-width:420px}
.bk-search input{width:100%;height:38px;border-radius:10px;border:1px solid var(--line);background:var(--card);color:var(--txt);padding:0 12px 0 36px;font:inherit;font-size:.92rem}
.bk-search input:focus{outline:2px solid color-mix(in srgb,var(--brand) 40%,transparent);border-color:var(--brand)}
.bk-search > .i{position:absolute;left:11px;top:10px;width:17px;height:17px;color:var(--faint)}
.bk-results{position:absolute;left:0;right:0;top:44px;background:var(--card);border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow-lg);max-height:60vh;overflow:auto;display:none;z-index:20}
.bk-results.open{display:block}
.bk-results a{display:block;padding:11px 14px;border-bottom:1px solid var(--line);color:var(--txt);font-size:.9rem;line-height:1.55}
.bk-results a:hover,.bk-results a:focus{background:var(--soft)}
.bk-results a b{display:block;color:var(--brand-ink);font-size:.8rem;font-weight:600;margin-bottom:2px}
.bk-results mark,.bk-art mark.hit{background:#ffe58a;color:#1c1500;border-radius:3px;padding:0 2px}
.bk-results .none{padding:14px;color:var(--mut);font-size:.9rem}
.bk-bar .bb-sp{flex:1}

/* ---------- landing (cover + contents) ---------- */
.bk-land{display:grid;grid-template-columns:280px 1fr;gap:44px;align-items:start;padding-top:8px}
.bk-land .bk-cover{font-size:17px}
.bk-land h1{font-family:'Noto Serif Bengali',var(--serif);font-size:clamp(1.8rem,3.4vw,2.5rem);line-height:1.3;color:var(--ink)}
.bk-land .bl-sub{color:var(--mut);font-size:1.05rem;line-height:1.7;margin-top:8px}
.bk-land .bl-acc{margin:18px 0;padding:14px 16px;border-radius:12px;background:var(--soft);border:1px solid var(--line);font-size:.95rem;line-height:1.65;display:flex;gap:10px}
.bk-land .bl-acc .i{flex:none;color:var(--brand);margin-top:3px}
.bk-land .bl-acts{display:flex;gap:10px;flex-wrap:wrap}
.bk-land h2{font-size:1.15rem;margin:30px 0 10px;color:var(--ink)}
.bl-list{list-style:none;padding:0;margin:0;border:1px solid var(--line);border-radius:14px;overflow:hidden;background:var(--card)}
.bl-list a{display:flex;gap:14px;align-items:center;padding:13px 16px;border-bottom:1px solid var(--line);color:var(--txt)}
.bl-list li:last-child a{border-bottom:0}
.bl-list a:hover{background:var(--soft)}
.bl-list .n{flex:none;font-family:'Noto Serif Bengali',var(--serif);font-weight:700;color:var(--brand);width:30px;font-size:1.1rem}
.bl-list span{flex:1;line-height:1.5}
.bl-list small{display:block;color:var(--mut);font-size:.82rem}
.bl-list .i{flex:none;width:16px;height:16px;color:var(--faint)}

/* ---------- chapter article ---------- */
.bk-art{max-width:780px;font-size:var(--bk-fs,17.5px);line-height:1.9;color:var(--txt)}
.bk-chead{border-radius:18px;padding:30px 30px 26px;margin-bottom:30px;color:#fff;position:relative;overflow:hidden;background:linear-gradient(135deg,var(--c1,#011835),var(--c2,#0050ed))}
.bk-chead::after{content:attr(data-n);position:absolute;right:18px;bottom:-34px;font-family:'Noto Serif Bengali',var(--serif);font-size:150px;font-weight:700;opacity:.12;line-height:1}
.bk-chead small{font-size:.85rem;opacity:.8;font-weight:600}
.bk-chead h1{font-family:'Noto Serif Bengali',var(--serif);font-size:clamp(1.55rem,3vw,2.15rem);line-height:1.35;margin-top:4px;color:#fff;max-width:90%}
.bk-chead p{opacity:.85;margin-top:8px;font-size:.98rem;line-height:1.6;max-width:90%}
.bk-art .lede{font-size:1.1em;line-height:1.85;color:var(--ink);border-left:4px solid var(--brand);padding:2px 0 2px 16px;margin-bottom:1.2em}
.bk-art h3{font-size:1.3em;line-height:1.45;color:var(--ink);margin:1.9em 0 .6em;padding-top:.6em;border-top:1px solid var(--line);scroll-margin-top:140px}
.bk-art p{margin:0 0 1em}
.bk-art ul,.bk-art ol{margin:0 0 1.1em;padding-left:1.4em}
.bk-art li{margin:.3em 0}
.bk-art code{font-family:ui-monospace,'Cascadia Mono',Consolas,monospace;font-size:.88em;background:var(--soft2);color:var(--brand-ink);padding:.1em .4em;border-radius:6px;white-space:nowrap}
.bk-art b,.bk-art strong{color:var(--ink)}

/* mnemonic / key-number tiles */
.bk-letters{display:grid;grid-template-columns:repeat(auto-fit,minmax(118px,1fr));gap:12px;margin:1.3em 0 1.5em}
.bk-letters > div{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:16px 12px 14px;text-align:center;box-shadow:var(--shadow-sm);position:relative;overflow:hidden}
.bk-letters > div::before{content:"";position:absolute;inset:0 0 auto;height:4px;background:var(--bk-col,var(--brand))}
.bk-letters b{display:grid;place-items:center;width:58px;height:58px;margin:4px auto 10px;border-radius:50%;font-size:1.65em;font-family:ui-monospace,Consolas,monospace;color:#fff;background:var(--bk-col,var(--brand));box-shadow:0 6px 16px color-mix(in srgb,var(--bk-col,var(--brand)) 35%,transparent)}
.bk-letters span{display:block;font-size:.86em;line-height:1.5;color:var(--txt)}
.bk-letters > div:nth-child(6n+1){--bk-col:#0050ed}.bk-letters > div:nth-child(6n+2){--bk-col:#0ea5a4}.bk-letters > div:nth-child(6n+3){--bk-col:#d97706}
.bk-letters > div:nth-child(6n+4){--bk-col:#7c3aed}.bk-letters > div:nth-child(6n+5){--bk-col:#db2777}.bk-letters > div:nth-child(6n+6){--bk-col:#16a34a}

/* flowchart */
.bk-flow{list-style:none;padding:0 !important;margin:1.4em 0 1.6em !important;display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:26px 30px;counter-reset:fl}
.bk-flow li{counter-increment:fl;position:relative;margin:0 !important;background:var(--card);border:1.5px solid color-mix(in srgb,var(--brand) 35%,var(--line));border-radius:14px;padding:30px 14px 14px;line-height:1.5;box-shadow:var(--shadow-sm)}
.bk-flow li::before{content:counter(fl);position:absolute;top:-14px;left:14px;width:30px;height:30px;border-radius:50%;background:var(--brand);color:#fff;font-weight:700;font-size:.85em;display:grid;place-items:center;box-shadow:0 0 0 4px var(--bg)}
.bk-flow li:not(:last-child)::after{content:"";position:absolute;right:-24px;top:50%;width:18px;height:14px;background:var(--brand);clip-path:polygon(0 30%,55% 30%,55% 0,100% 50%,55% 100%,55% 70%,0 70%);opacity:.75}
.bk-flow b{display:block;color:var(--ink);font-size:.95em}
.bk-flow span{display:block;font-size:.84em;color:var(--mut);margin-top:3px}

/* command anatomy */
.bk-anat{display:flex;flex-wrap:wrap;gap:6px;justify-content:center;margin:1.4em 0 .8em;padding:34px 16px 18px;background:var(--navy);border-radius:16px;font-family:ui-monospace,'Cascadia Mono',Consolas,monospace}
.bk-anat span{position:relative;font-size:1.25em;font-weight:700;padding:.3em .55em;border-radius:8px;color:#fff;background:var(--ak);border-bottom:4px solid color-mix(in srgb,var(--ak) 60%,#000)}
.bk-anat span::before{content:attr(data-k);position:absolute;top:-24px;left:50%;transform:translateX(-50%);width:20px;height:20px;border-radius:50%;background:#fff;color:var(--navy);font-size:12px;display:grid;place-items:center;font-family:var(--sans)}
.bk-anat span:nth-child(6n+1),.bk-anat-key li:nth-child(6n+1){--ak:#2f6bff}.bk-anat span:nth-child(6n+2),.bk-anat-key li:nth-child(6n+2){--ak:#0d9488}
.bk-anat span:nth-child(6n+3),.bk-anat-key li:nth-child(6n+3){--ak:#d97706}.bk-anat span:nth-child(6n+4),.bk-anat-key li:nth-child(6n+4){--ak:#9333ea}
.bk-anat span:nth-child(6n+5),.bk-anat-key li:nth-child(6n+5){--ak:#db2777}.bk-anat span:nth-child(6n+6),.bk-anat-key li:nth-child(6n+6){--ak:#15803d}
.bk-anat-key{list-style:none;padding:0 !important;margin:0 0 1.5em !important;display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:6px 18px;counter-reset:ak}
.bk-anat-key li{counter-increment:ak;display:flex;gap:10px;align-items:flex-start;font-size:.92em;line-height:1.55}
.bk-anat-key li::before{content:counter(ak);flex:none;width:22px;height:22px;border-radius:50%;background:var(--ak);color:#fff;font-size:12px;font-weight:700;display:grid;place-items:center;margin-top:3px}

/* terminal */
.bk-term{position:relative;background:#0a1226;color:#d7f7e4;font-family:ui-monospace,'Cascadia Mono',Consolas,monospace;font-size:.8em;line-height:1.6;border-radius:12px;padding:38px 18px 16px;overflow-x:auto;margin:1.2em 0 1.4em;border:1px solid #1d2a4d;white-space:pre}
.bk-term::before{content:"";position:absolute;top:13px;left:16px;width:10px;height:10px;border-radius:50%;background:#ff5f57;box-shadow:16px 0 #febc2e,32px 0 #28c840}
.bk-term::after{content:"টার্মিনাল";position:absolute;top:8px;right:14px;font-family:var(--sans);font-size:11px;color:#6f7fa8}

/* tables */
.bk-art table{width:100%;border-collapse:separate;border-spacing:0;margin:1.2em 0 1.5em;font-size:.9em;line-height:1.55;border:1px solid var(--line);border-radius:14px;overflow:hidden;background:var(--card)}
.bk-art th{background:var(--soft2);color:var(--ink);text-align:left;font-weight:700;padding:11px 12px;border-bottom:1px solid var(--line)}
.bk-art td{padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top}
.bk-art tr:last-child td{border-bottom:0}
.bk-art tr:nth-child(even) td{background:color-mix(in srgb,var(--soft) 60%,transparent)}
.bk-art td code{white-space:normal;word-break:break-word}
.bk-art table.bk-ref th{background:var(--navy);color:#fff}
.bk-art table.bk-err th{background:#fdecec;color:#9f1d1d}
.bk-art table.bk-err td:first-child code,.bk-art table.bk-err td:first-child{color:#b42318;font-weight:600}
:root[data-theme="dark"] .bk-art table.bk-err th{background:#3a1515;color:#ffb4b4}
:root[data-theme="dark"] .bk-art table.bk-err td:first-child,:root[data-theme="dark"] .bk-art table.bk-err td:first-child code{color:#ff9d9d}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .bk-art table.bk-err th{background:#3a1515;color:#ffb4b4}:root:not([data-theme="light"]) .bk-art table.bk-err td:first-child,:root:not([data-theme="light"]) .bk-art table.bk-err td:first-child code{color:#ff9d9d}}
.bk-art table.bk-cmp th:first-child{background:var(--soft2)}
.bk-art table.bk-cmp th{background:var(--brand-soft);color:var(--brand-ink)}

/* call-outs */
.bk-tip,.bk-warn,.bk-key,.bk-case{border-radius:14px;padding:14px 18px 14px 52px;margin:1.2em 0 1.4em;position:relative;line-height:1.75}
.bk-tip::before,.bk-warn::before,.bk-key::before,.bk-case::before{position:absolute;left:14px;top:13px;width:26px;height:26px;border-radius:8px;display:grid;place-items:center;font-size:15px;font-weight:800;color:#fff}
.bk-tip{background:var(--green-soft);border:1px solid color-mix(in srgb,var(--green) 25%,transparent)}.bk-tip::before{content:"✓";background:var(--green)}
.bk-warn{background:#fff4e5;border:1px solid #f6d3a1}.bk-warn::before{content:"!";background:#d97706}
.bk-key{background:var(--brand-soft);border:1px solid color-mix(in srgb,var(--brand) 25%,transparent)}.bk-key::before{content:"★";background:var(--brand)}
.bk-case{background:var(--card);border:1px solid var(--line);box-shadow:var(--shadow-sm);border-left:5px solid #7c3aed}.bk-case::before{content:"✈";background:#7c3aed}
:root[data-theme="dark"] .bk-warn{background:#2b2010;border-color:#5a4114}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .bk-warn{background:#2b2010;border-color:#5a4114}}
.bk-tip > b:first-child,.bk-warn > b:first-child,.bk-key > b:first-child,.bk-case > b:first-child{margin-right:4px}

/* checklist */
.bk-check{list-style:none;padding:0 !important;background:var(--card);border:1px solid var(--line);border-radius:14px;overflow:hidden}
.bk-check li{margin:0 !important;padding:10px 14px 10px 48px;border-bottom:1px solid var(--line);position:relative;cursor:pointer;user-select:none}
.bk-check li:last-child{border-bottom:0}
.bk-check li::before{content:"";position:absolute;left:15px;top:13px;width:20px;height:20px;border-radius:6px;border:2px solid var(--line2);background:var(--bg)}
.bk-check li.ok::before{background:var(--green);border-color:var(--green)}
.bk-check li.ok::after{content:"";position:absolute;left:22px;top:16px;width:6px;height:11px;border:solid #fff;border-width:0 2.5px 2.5px 0;transform:rotate(45deg)}
.bk-check li.ok{color:var(--mut)}

/* try-it */
.bk-try{border:2px dashed color-mix(in srgb,var(--brand) 45%,var(--line));border-radius:16px;padding:18px 20px;margin:1.6em 0;background:color-mix(in srgb,var(--brand-soft) 45%,transparent)}
.bk-try > b:first-child{display:flex;align-items:center;gap:8px;color:var(--brand-ink);font-size:1.05em;margin-bottom:6px}
.bk-try > b:first-child::before{content:"✍";font-size:1.1em}
.bk-try details{margin-top:8px;background:var(--card);border-radius:10px;border:1px solid var(--line);padding:10px 14px}
.bk-try summary{cursor:pointer;font-weight:600;color:var(--brand)}

/* cheat sheet */
.bk-cheat{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:8px;margin:1.4em 0;padding:16px;border-radius:16px;background:var(--navy);position:relative}
.bk-cheat::before{content:"চিট শিট";grid-column:1/-1;color:#9fc0ff;font-weight:700;font-size:.85em}
.bk-cheat > div{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1);border-radius:10px;padding:9px 11px}
.bk-cheat code{display:block;background:none;color:#7fe0b4;padding:0;font-size:.92em;white-space:normal;word-break:break-word}
.bk-cheat span{display:block;color:#d6def5;font-size:.8em;line-height:1.5;margin-top:3px}

/* locked chapter */
.bk-lock{position:relative}
.bk-lock .bl-fade{max-height:340px;overflow:hidden;-webkit-mask-image:linear-gradient(#000 30%,transparent);mask-image:linear-gradient(#000 30%,transparent);pointer-events:none;user-select:none}
.bk-gate{margin-top:-40px;position:relative;text-align:center;background:var(--card);border:1px solid var(--line);border-radius:20px;padding:30px 24px;box-shadow:var(--shadow)}
.bk-gate .i.big{width:42px;height:42px;color:var(--gold)}
.bk-gate h3{border:0 !important;margin:.4em 0 .3em !important;padding:0 !important}
.bk-gate p{color:var(--mut);max-width:520px;margin:0 auto 16px !important}
.bk-gate .acts{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}

/* prev / next */
.bk-pn{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:44px;max-width:780px}
.bk-pn a{border:1px solid var(--line);border-radius:14px;padding:14px 16px;color:var(--txt);background:var(--card);line-height:1.45}
.bk-pn a:hover{border-color:var(--brand)}
.bk-pn small{display:block;color:var(--mut);font-size:.8rem}
.bk-pn .nx{text-align:right;grid-column:2}
.bk-honest{max-width:780px;margin-top:28px;font-size:.84rem;color:var(--faint);line-height:1.6}

/* ---------- mobile ---------- */
@media (max-width:960px){
  .bk-shell{grid-template-columns:1fr}
  .bk-side{position:fixed;left:0;top:0;bottom:0;height:auto;width:min(86vw,330px);z-index:60;transform:translateX(-105%);transition:transform .25s;box-shadow:var(--shadow-lg);background:var(--bg)}
  .bk-side.open{transform:none}
  .bk-scrim{position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:59;display:none}
  .bk-scrim.open{display:block}
  .bk-bar .bb-menu{display:inline-flex}
  .bk-main{padding:0 16px 70px}
  .bk-land{grid-template-columns:1fr;gap:26px}
  .bk-land .bk-cover{max-width:260px;margin:0 auto;width:100%}
}
@media (max-width:640px){
  .bk-bar .bb-lbl{display:none}
  .bk-art{font-size:var(--bk-fs,16.5px)}
  .bk-chead{padding:22px 20px 20px}
  .bk-flow{grid-template-columns:1fr;gap:22px}
  .bk-flow li:not(:last-child)::after{right:auto;left:50%;top:auto;bottom:-20px;transform:translateX(-50%) rotate(90deg)}
  .bk-art table{display:block;overflow-x:auto}
  .bk-pn{grid-template-columns:1fr}.bk-pn .nx{grid-column:1}
}

/* ---------- print / PDF ---------- */
#bkPrint{display:none}
@media print{
  @page{size:A4;margin:16mm 14mm 16mm}
  body > *:not(#bkPrint):not(.bk-wm){display:none !important}
  #bkPrint{display:block}
  html,body{background:#fff !important}
  :root{--bg:#fff;--card:#fff;--soft:#f5f7fb;--soft2:#eef1f8;--ink:#0b1430;--txt:#1c2440;--mut:#5b6382;--line:#dfe3ee;--line2:#cfd5e4;--brand:#0050ed;--brand-ink:#0040b8;--brand-soft:#e9f1ff}
  *{-webkit-print-color-adjust:exact;print-color-adjust:exact}
  .bk-wm{display:block !important;position:fixed;inset:0;background:url("img/brand/mark.png") center/110mm no-repeat !important;opacity:.06 !important}
  .bkp-cover{height:255mm;display:flex;align-items:stretch;justify-content:center;break-after:page}
  .bkp-cover .bk-cover{width:100%;aspect-ratio:auto;font-size:30px;border-radius:0;box-shadow:none;padding:16% 12% 10% 16%}
  .bkp-toc{break-after:page}
  .bkp-toc h2{font-family:'Noto Serif Bengali',serif;font-size:24pt;margin-bottom:10mm}
  .bkp-toc ol{font-size:13pt;line-height:2}
  .bkp-ch{break-before:page}
  .bk-art{max-width:none;font-size:11pt;line-height:1.75}
  .bk-chead{break-inside:avoid}
  .bk-art h3{break-after:avoid}
  .bk-flow,.bk-letters,.bk-anat,.bk-term,.bk-tip,.bk-warn,.bk-key,.bk-case,.bk-try,.bk-art tr,.bk-cheat > div{break-inside:avoid}
  .bk-try details{display:block}.bk-try details > *{display:block}
  .bk-term{white-space:pre-wrap}
  .bkp-foot{margin-top:10mm;font-size:9pt;color:#5b6382;border-top:1px solid #dfe3ee;padding-top:3mm}
}