/* Tech BD — public stylesheet. Hand-written, no framework. Mobile-first, light theme. */

@font-face {
  font-family: "Noto Sans Bengali";
  font-style: normal; font-weight: 400; font-display: swap;
  src: url("fonts/noto-sans-bengali-400.woff2") format("woff2");
  unicode-range: U+0980-09FF, U+200C-200D, U+25CC;
}
@font-face {
  font-family: "Noto Sans Bengali";
  font-style: normal; font-weight: 700; font-display: swap;
  src: url("fonts/noto-sans-bengali-700.woff2") format("woff2");
  unicode-range: U+0980-09FF, U+200C-200D, U+25CC;
}

:root {
  --bg: #ffffff;
  --surface: #f6f8fb;
  --border: #e3e8ef;
  --text: #16213a;
  --muted: #5b6b85;
  --brand: #0f172a;
  --accent: #1d4ed8;
  --accent-soft: #e8efff;
  --ok: #15803d;
  --err: #b91c1c;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(15, 23, 42, .06), 0 8px 24px -12px rgba(15, 23, 42, .18);
  --font: -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Noto Sans Bengali", sans-serif;
  --font-bn: "Noto Sans Bengali", "Nirmala UI", "Bangla Sangam MN", "Vrinda", -apple-system, "Segoe UI", Roboto, sans-serif;
  --max: 1180px;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.65 var(--font); -webkit-font-smoothing: antialiased;
}
body.lang-bn { font-family: var(--font-bn); font-size: 17px; line-height: 1.8; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { line-height: 1.25; margin: 0 0 .5em; color: var(--brand); letter-spacing: -.01em; }
h1 { font-size: 2rem; } h2 { font-size: 1.5rem; } h3 { font-size: 1.15rem; }
p { margin: 0 0 1em; }
.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 16px; }
.container.narrow { max-width: 860px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip-link { position: absolute; left: -999px; top: 8px; background: var(--brand); color: #fff; padding: 8px 12px; border-radius: 6px; z-index: 100; }
.skip-link:focus { left: 8px; }
.btn { display: inline-block; background: var(--accent); color: #fff; padding: 10px 18px; border-radius: 8px; border: 0; font: inherit; font-weight: 600; cursor: pointer; }
.btn:hover { background: #1e40af; text-decoration: none; }

/* ---------- header ---------- */
.site-header { background: var(--bg); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 50; }
.header-inner { display: flex; align-items: center; gap: 16px; min-height: 68px; flex-wrap: wrap; }
.brand img { height: 48px; width: auto; }
.nav-toggle { margin-left: auto; width: 44px; height: 44px; border: 1px solid var(--border); background: #fff; border-radius: 8px; display: inline-flex; flex-direction: column; justify-content: center; align-items: center; gap: 5px; cursor: pointer; }
.nav-toggle span { display: block; width: 20px; height: 2px; background: var(--brand); border-radius: 2px; transition: transform .2s, opacity .2s; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
.site-nav { display: none; width: 100%; padding-bottom: 12px; }
.site-nav.open { display: block; }
.site-nav > ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 2px; }
.site-nav > ul > li > a { display: block; padding: 10px 8px; color: var(--brand); font-weight: 600; border-radius: 6px; }
.site-nav > ul > li > a:hover { background: var(--surface); text-decoration: none; }
.site-nav ul ul { list-style: none; margin: 0; padding: 0 0 0 16px; }
.site-nav ul ul a { display: block; padding: 6px 8px; color: var(--muted); }
.nav-tools { display: flex; gap: 10px; align-items: center; margin-top: 10px; }
.search-form { display: flex; flex: 1; min-width: 0; }
.search-form input { flex: 1; min-width: 0; padding: 9px 12px; border: 1px solid var(--border); border-radius: 8px 0 0 8px; font: inherit; }
.search-form button { padding: 9px 12px; border: 1px solid var(--border); border-left: 0; background: var(--surface); border-radius: 0 8px 8px 0; cursor: pointer; font: inherit; }
.lang-switch { padding: 8px 12px; border: 1px solid var(--border); border-radius: 8px; color: var(--brand); font-weight: 600; white-space: nowrap; }

@media (min-width: 900px) {
  .nav-toggle { display: none; }
  .site-nav { display: flex; align-items: center; flex: 1; width: auto; padding: 0; gap: 12px; }
  .site-nav > ul { flex-direction: row; align-items: center; gap: 0; flex: 1; flex-wrap: wrap; }
  .site-nav > ul > li { position: relative; }
  .site-nav > ul > li > a { padding: 22px 12px; border-radius: 0; }
  .site-nav > ul > li > a:hover { background: none; color: var(--accent); }
  .site-nav ul ul { position: absolute; top: 100%; left: 0; min-width: 200px; background: #fff; border: 1px solid var(--border); border-radius: 0 0 10px 10px; box-shadow: var(--shadow); padding: 6px 0; display: none; }
  .site-nav ul ul a { padding: 8px 16px; color: var(--text); }
  .site-nav ul ul a:hover { background: var(--surface); text-decoration: none; }
  .site-nav li.has-children:hover > ul, .site-nav li.has-children:focus-within > ul { display: block; }
  .nav-tools { margin: 0; }
  .search-form { width: 220px; flex: none; }
}

/* ---------- home ---------- */
main { padding: 24px 0 48px; }
.featured { display: grid; gap: 16px; margin-bottom: 32px; }
.feat { position: relative; border-radius: var(--radius); overflow: hidden; background: var(--brand); color: #fff; min-height: 220px; }
.feat img, .feat .img-placeholder { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; opacity: .85; }
.feat-body { position: absolute; inset: auto 0 0 0; padding: 18px; background: linear-gradient(to top, rgba(10, 15, 30, .92), rgba(10, 15, 30, 0)); }
.feat-title { font-size: 1.1rem; margin: 6px 0 4px; }
.feat-title a { color: #fff; }
.feat-main .feat-title { font-size: 1.6rem; }
.feat-summary { color: #d7deea; margin: 0 0 6px; display: none; }
.feat .card-cat { background: var(--accent); color: #fff; }
.feat .card-meta { color: #c3cbda; margin: 0; }
@media (min-width: 700px) {
  .featured { grid-template-columns: repeat(2, 1fr); }
  .feat-main { grid-column: 1 / -1; }
  .feat-main .feat-title { font-size: 2rem; }
  .feat-summary { display: block; }
}
@media (min-width: 1000px) {
  .featured { grid-template-columns: repeat(4, 1fr); grid-auto-rows: minmax(200px, auto); }
  .feat-main { grid-column: 1 / 3; grid-row: 1 / 3; }
  .feat-main img { height: 100%; aspect-ratio: auto; }
}

.section-title { font-size: 1.35rem; padding-bottom: 10px; border-bottom: 2px solid var(--brand); margin-bottom: 20px; display: flex; align-items: center; gap: 10px; }
.section-title::before { content: ""; width: 6px; height: 22px; background: var(--accent); border-radius: 3px; }
.with-sidebar { display: grid; gap: 32px; }
@media (min-width: 1000px) { .with-sidebar { grid-template-columns: minmax(0, 1fr) 320px; align-items: start; } }
.grid { display: grid; gap: 22px; grid-template-columns: 1fr; }
@media (min-width: 560px) { .grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1000px) { .grid { grid-template-columns: repeat(3, 1fr); } .grid.grid-4 { grid-template-columns: repeat(4, 1fr); } .content .grid { grid-template-columns: repeat(2, 1fr); } .content .grid.grid-4 { grid-template-columns: repeat(2, 1fr); } }

/* ---------- cards ---------- */
.card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; display: flex; flex-direction: column; transition: box-shadow .2s, transform .2s; }
.card:hover { box-shadow: var(--shadow); transform: translateY(-2px); }
.card-media img, .img-placeholder { width: 100%; aspect-ratio: 750 / 415; object-fit: cover; background: var(--surface); }
.card-body { padding: 14px 16px 16px; display: flex; flex-direction: column; gap: 6px; flex: 1; }
.card-cat { display: inline-block; font-size: .72rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--accent); background: var(--accent-soft); padding: 3px 8px; border-radius: 4px; align-self: flex-start; }
.card-cat:hover { text-decoration: none; background: var(--accent); color: #fff; }
.card-title { font-size: 1.08rem; margin: 0; }
.card-title a { color: var(--brand); }
.card-summary { color: var(--muted); font-size: .93rem; margin: 0; }
.card-meta { color: var(--muted); font-size: .82rem; margin: auto 0 0; padding-top: 4px; }
.card-compact .card-title { font-size: .98rem; }
.empty { color: var(--muted); padding: 24px; background: var(--surface); border-radius: var(--radius); }

/* ---------- sidebar ---------- */
.widget { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; margin-bottom: 20px; }
.widget-title { font-size: 1rem; text-transform: uppercase; letter-spacing: .06em; margin-bottom: 14px; padding-bottom: 8px; border-bottom: 2px solid var(--brand); }
.popular-list { list-style: none; margin: 0; padding: 0; counter-reset: pop; }
.popular-list li { padding: 8px 0; border-bottom: 1px solid var(--border); }
.popular-list li:last-child { border: 0; }
.popular-list a { display: grid; grid-template-columns: 88px 1fr; gap: 12px; align-items: center; color: var(--brand); font-weight: 600; font-size: .93rem; line-height: 1.35; }
.popular-list img, .popular-list .img-placeholder { width: 88px; aspect-ratio: 16 / 9; border-radius: 6px; object-fit: cover; }
.cat-list, .cat-list ul { list-style: none; margin: 0; padding: 0; }
.cat-list > li { border-bottom: 1px solid var(--border); }
.cat-list > li:last-child { border: 0; }
.cat-list a { display: flex; justify-content: space-between; padding: 8px 0; color: var(--text); }
.cat-list a span { color: var(--muted); font-size: .85rem; background: var(--surface); padding: 0 8px; border-radius: 10px; }
.cat-list ul { padding-left: 14px; }
.cat-list ul a { padding: 5px 0; color: var(--muted); font-size: .93rem; }

/* ---------- ads ---------- */
.ad { margin: 24px 0; text-align: center; }
.ad-label { display: block; font-size: .68rem; text-transform: uppercase; letter-spacing: .1em; color: #6b7a90; margin-bottom: 4px; }
.ad-sidebar { margin: 0 0 20px; }

/* ---------- breadcrumb / page head ---------- */
.breadcrumb ol { list-style: none; margin: 0 0 14px; padding: 0; display: flex; flex-wrap: wrap; gap: 4px; font-size: .85rem; color: var(--muted); }
.breadcrumb li + li::before { content: "›"; margin: 0 6px 0 2px; color: #9aa6ba; }
.breadcrumb a { color: var(--muted); }
.page-head { margin-bottom: 22px; }
.page-desc { color: var(--muted); }
.author-card { display: flex; gap: 18px; align-items: flex-start; background: var(--surface); border-radius: var(--radius); padding: 18px; }
.author-card p { margin: 0 0 6px; }

/* ---------- single post ---------- */
.post-head { margin-bottom: 20px; }
.post-title { font-size: 1.9rem; margin: 10px 0 8px; }
@media (min-width: 700px) { .post-title { font-size: 2.4rem; } }
.post-summary { font-size: 1.12rem; color: var(--muted); }
.byline { display: flex; flex-wrap: wrap; gap: 6px 18px; align-items: center; font-size: .88rem; color: var(--muted); }
.byline-author { display: inline-flex; align-items: center; gap: 8px; color: var(--brand); font-weight: 600; }
.avatar { border-radius: 50%; object-fit: cover; flex: none; }
.avatar-initial { display: inline-flex; align-items: center; justify-content: center; width: var(--s, 40px); height: var(--s, 40px); background: var(--accent); color: #fff; font-weight: 700; font-size: calc(var(--s, 40px) * .45); }
.translation-link { margin: 10px 0 0; font-weight: 600; }
.post-hero { margin: 0 0 24px; }
.post-hero img { width: 100%; border-radius: var(--radius); }
.post-body { font-size: 1.08rem; line-height: 1.8; max-width: 760px; }
body.lang-bn .post-body { font-size: 1.13rem; line-height: 1.95; }
.post-body img { border-radius: 8px; margin: 8px auto; }
.post-body h2 { margin-top: 1.6em; font-size: 1.5rem; }
.post-body h3 { margin-top: 1.4em; }
.post-body ul, .post-body ol { padding-left: 1.4em; }
.post-body blockquote { margin: 1.2em 0; padding: 12px 18px; border-left: 4px solid var(--accent); background: var(--surface); border-radius: 0 8px 8px 0; color: var(--muted); }
.post-body pre { background: #0f172a; color: #e2e8f0; padding: 16px; border-radius: 8px; overflow: auto; font-size: .9rem; }
.post-body code { background: var(--surface); padding: 2px 5px; border-radius: 4px; font-size: .92em; }
.post-body pre code { background: none; padding: 0; }
.post-body table { border-collapse: collapse; width: 100%; margin: 1em 0; font-size: .95rem; }
.post-body td, .post-body th { border: 1px solid var(--border); padding: 8px 10px; text-align: left; }
.post-body iframe { max-width: 100%; }
.post-source { font-size: .9rem; color: var(--muted); border-top: 1px dashed var(--border); padding-top: 10px; }
.post-tags { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin: 18px 0; font-size: .9rem; }
.post-tags span { color: var(--muted); }
.post-tags a { background: var(--surface); border: 1px solid var(--border); padding: 3px 10px; border-radius: 20px; color: var(--text); }
.post-tags a:hover { background: var(--accent-soft); text-decoration: none; }
.share { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin: 18px 0 26px; font-size: .9rem; }
.share span { color: var(--muted); }
.share a, .share button { padding: 6px 12px; border-radius: 6px; border: 1px solid var(--border); background: #fff; color: var(--brand); font: inherit; font-size: .88rem; cursor: pointer; }
.share a:hover, .share button:hover { background: var(--surface); text-decoration: none; }
.author-box { display: flex; gap: 18px; background: var(--surface); border-radius: var(--radius); padding: 20px; margin: 26px 0; }
.author-box-label { font-size: .75rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); margin: 0; }
.author-box-name { font-size: 1.15rem; margin: 2px 0 6px; }
.author-links a { margin-right: 10px; font-size: .9rem; }
.related { margin-top: 32px; }

/* ---------- forms / contact ---------- */
.contact-form { max-width: 640px; margin-top: 28px; background: var(--surface); padding: 22px; border-radius: var(--radius); }
.form-row { margin-bottom: 14px; }
.form-row label { display: block; font-weight: 600; margin-bottom: 4px; font-size: .92rem; }
.form-row input, .form-row textarea { width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; font: inherit; background: #fff; }
.form-row input:focus, .form-row textarea:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }
.hp { position: absolute; left: -9999px; }
.alert { padding: 12px 16px; border-radius: 8px; margin-bottom: 16px; }
.alert-ok { background: #ecfdf5; color: var(--ok); border: 1px solid #a7f3d0; }
.alert-err { background: #fef2f2; color: var(--err); border: 1px solid #fecaca; }

/* ---------- pagination ---------- */
.pagination { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-top: 30px; font-weight: 600; }
.pagination a { padding: 8px 14px; border: 1px solid var(--border); border-radius: 8px; background: #fff; }
.page-info { color: var(--muted); font-weight: 400; font-size: .9rem; margin: 0 auto; }

/* ---------- 404 ---------- */
.notfound { text-align: center; padding: 40px 0; }
.notfound-code { font-size: 5rem; font-weight: 800; color: var(--border); margin: 0; line-height: 1; }
.notfound .search-form { max-width: 420px; margin: 20px auto; }

/* ---------- footer ---------- */
.site-footer { background: var(--brand); color: #c8d1e0; margin-top: 40px; font-size: .93rem; }
.site-footer a { color: #e6ebf3; }
.footer-grid { display: grid; gap: 28px; padding: 40px 16px 24px; }
@media (min-width: 700px) { .footer-grid { grid-template-columns: 2fr 1fr 1fr 1fr; } }
.footer-about img { height: 40px; width: auto; background: #fff; padding: 6px 10px; border-radius: 8px; margin-bottom: 14px; }
.footer-contact { color: #98a4b8; }
.footer-title { color: #fff; font-size: .85rem; text-transform: uppercase; letter-spacing: .08em; margin-bottom: 12px; }
.footer-links { list-style: none; margin: 0; padding: 0; }
.footer-links li { margin-bottom: 6px; }
.footer-bottom { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; padding: 16px; border-top: 1px solid rgba(255, 255, 255, .12); color: #98a4b8; font-size: .85rem; }
.footer-bottom p { margin: 0; }