:root {
  --red-950: #170303;
  --red-900: #350405;
  --red-800: #65080c;
  --red-700: #a40914;
  --red-600: #d61420;
  --gold-600: #cc841c;
  --gold-500: #f0ad35;
  --gold-300: #ffe38b;
  --green-700: #075a35;
  --paper: #f2f2f0;
  --paper-2: #fff8ed;
  --white: #fff;
  --ink: #211410;
  --muted: #70635d;
  --line: rgba(91, 15, 10, .15);
  --shadow: 0 18px 42px rgba(53, 4, 5, .14);
  --max: 1180px;
}
* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; overflow-x: hidden; }
body { color: var(--ink); background: var(--paper); font-family: Arial, "Noto Sans Bengali", "Helvetica Neue", sans-serif; line-height: 1.6; letter-spacing: 0; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.bd-container { width: min(var(--max), calc(100% - 40px)); margin: 0 auto; }
.bd-header { position: relative; z-index: 10; background: #e9e9e7; border-bottom: 1px solid rgba(45, 28, 18, .08); }
.bd-top { min-height: 92px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.bd-logo { display: inline-flex; align-items: center; gap: 12px; min-width: 0; }
.bd-logo-mark { width: 64px; height: 64px; display: grid; place-items: center; border-radius: 10px; color: #fff; background: radial-gradient(circle at 28% 20%, #ffe897 0 13%, transparent 28%), linear-gradient(135deg, #ff9d0d 0%, #c50d18 54%, #230204 100%); box-shadow: inset 0 0 0 1px rgba(255,255,255,.3), 0 14px 26px rgba(99,7,12,.22); font-size: 24px; font-weight: 900; }
.bd-logo-text { display: grid; line-height: 1; }
.bd-logo-text strong { color: #23130d; font-size: 38px; font-weight: 900; }
.bd-logo-text span { margin-top: 6px; color: var(--red-700); font-size: 13px; font-weight: 900; text-transform: uppercase; }
.bd-actions { display: flex; align-items: center; justify-content: flex-end; gap: 14px; flex-wrap: wrap; }
.bd-btn { min-height: 44px; display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 0 23px; border-radius: 999px; border: 1px solid transparent; color: #fff; background: linear-gradient(180deg, #f14c55 0%, #b80713 100%); box-shadow: 0 0 18px rgba(201,13,24,.26); font-size: 14px; font-weight: 900; text-transform: uppercase; white-space: nowrap; }
.bd-btn.secondary { color: #391709; background: linear-gradient(180deg, #ffe999 0%, #eca432 100%); box-shadow: 0 0 18px rgba(214,145,25,.24); }
.bd-btn.dark { color: var(--gold-300); background: rgba(16,2,2,.42); border-color: rgba(255,227,138,.45); box-shadow: none; }
.bd-btn svg { width: 18px; height: 18px; }
.bd-nav { background: #dfdfdd; border-top: 1px solid rgba(45, 28, 18, .06); border-bottom: 1px solid rgba(45, 28, 18, .08); }
.bd-nav-inner { min-height: 58px; display: flex; align-items: center; justify-content: center; gap: 6px; flex-wrap: wrap; }
.bd-nav a { min-height: 40px; display: inline-flex; align-items: center; justify-content: center; padding: 0 13px; border-radius: 8px; color: #ad0d17; text-shadow: 0 0 12px rgba(183,13,22,.25); font-size: 13px; font-weight: 900; text-transform: uppercase; white-space: nowrap; }
.bd-nav a:hover, .bd-nav .is-active { color: #fff; background: linear-gradient(180deg, #f65b65, #b80813); }
.bd-hero { position: relative; min-height: 610px; display: grid; align-items: center; color: #fff; background: linear-gradient(90deg, rgba(9,1,1,.96) 0%, rgba(22,2,2,.88) 35%, rgba(32,4,4,.5) 64%, rgba(8,1,1,.18) 100%), url("bd10-hero.jpg") center / cover no-repeat; overflow: hidden; }
.bd-hero::after { content: ""; position: absolute; inset: auto 0 0; height: 120px; background: linear-gradient(180deg, transparent, rgba(22,2,2,.7)); pointer-events: none; }
.bd-hero-copy { position: relative; z-index: 1; width: min(650px, 100%); padding: 76px 0 84px; }
h1, h2, h3, p { margin-top: 0; }
.bd-hero h1 { margin-bottom: 20px; color: #fff; font-size: clamp(48px, 7vw, 88px); line-height: .94; font-weight: 900; text-transform: uppercase; text-shadow: 0 8px 0 rgba(0,0,0,.16), 0 22px 44px rgba(0,0,0,.34); }
.bd-hero h1 span { color: var(--gold-300); display: block; font-size: .48em; line-height: 1.08; }
.bd-hero p { max-width: 610px; margin-bottom: 28px; color: rgba(255,249,237,.9); font-size: 20px; font-weight: 700; }
.bd-hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 22px; }
.bd-official { color: rgba(255,249,237,.9); font-size: 15px; font-weight: 900; }
.bd-official strong { color: var(--gold-300); }
.bd-main { background: linear-gradient(180deg, #fff 0%, var(--paper-2) 45%, #f1e8dc 100%); }
.bd-intro { padding: 36px 0 22px; }
.bd-intro-box { border: 6px solid #075a35; border-radius: 9px; background: #eee; box-shadow: 0 20px 42px rgba(7,90,53,.16); padding: clamp(22px, 4vw, 40px); }
.bd-intro-box h2 { margin-bottom: 16px; color: #075a35; font-size: clamp(28px, 4vw, 42px); line-height: 1.1; text-align: center; font-weight: 900; }
.bd-intro-box p { color: #251815; font-size: 17px; font-weight: 600; }
.bd-section { padding: 56px 0; }
.bd-section.compact { padding-top: 36px; }
.bd-section-head { max-width: 760px; margin: 0 auto 30px; text-align: center; }
.bd-section-head h2 { margin-bottom: 10px; color: var(--red-800); font-size: clamp(30px, 4.2vw, 48px); line-height: 1.05; font-weight: 900; }
.bd-section-head p { color: var(--muted); font-size: 16px; font-weight: 700; }
.bd-section-head.light h2, .bd-section-head.light p { color: #fff8ed; }
.bd-split { display: grid; grid-template-columns: 1fr 1fr; gap: 36px; align-items: center; }
.bd-feature-visual { min-height: 390px; border-radius: 8px; background: linear-gradient(90deg, rgba(18,2,2,.06), transparent), url("bd10-app.jpg") center / cover no-repeat; box-shadow: var(--shadow); }
.bd-feature-copy h2 { margin-bottom: 14px; color: var(--red-800); font-size: clamp(32px, 4vw, 46px); line-height: 1.08; font-weight: 900; }
.bd-feature-copy > p { color: var(--muted); font-size: 16px; font-weight: 700; }
.bd-feature-list { display: grid; gap: 14px; margin-top: 22px; }
.bd-feature-row { display: grid; grid-template-columns: 52px 1fr; gap: 14px; align-items: start; padding: 18px; border-radius: 8px; background: #fff; border: 1px solid var(--line); box-shadow: 0 10px 22px rgba(50,5,7,.07); }
.bd-feature-row span, .bd-category-icon, .bd-step::before { width: 42px; height: 42px; display: inline-grid; place-items: center; border-radius: 999px; color: #5a2506; background: linear-gradient(180deg, #ffe791 0%, #eda32f 100%); font-size: 12px; font-weight: 900; }
.bd-feature-row h3, .bd-category-card h3, .bd-visual-card h3, .bd-article-card h3, .bd-step h3, .bd-faq h3 { margin-bottom: 8px; color: var(--red-800); line-height: 1.16; font-weight: 900; }
.bd-feature-row p, .bd-category-card p, .bd-visual-card p, .bd-article-card p, .bd-step p, .bd-faq p { margin-bottom: 0; color: var(--muted); font-size: 14px; font-weight: 700; }
.bd-category-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.bd-category-card { min-height: 214px; display: flex; flex-direction: column; gap: 14px; padding: 20px; border-radius: 8px; background: #fff; border: 1px solid var(--line); box-shadow: 0 14px 30px rgba(50,5,7,.08); }
.bd-read { margin-top: auto; color: var(--red-700); font-size: 12px; font-weight: 900; text-transform: uppercase; display: inline-flex; align-items: center; gap: 6px; }
.bd-read svg { width: 16px; height: 16px; }
.red-band { color: #fff; background: radial-gradient(circle at top left, rgba(255,227,138,.18), transparent 33%), linear-gradient(135deg, #2b0305 0%, #6c070d 48%, #160202 100%); }
.bd-visual-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.bd-visual-card { overflow: hidden; border-radius: 8px; background: #fff; color: var(--ink); box-shadow: 0 18px 42px rgba(0,0,0,.24); }
.bd-visual-card img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.bd-visual-card div { padding: 18px; }
.bd-visual-card span, .bd-article-card span, .bd-kicker { color: var(--red-700); font-size: 12px; font-weight: 900; text-transform: uppercase; }
.bd-step-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; counter-reset: steps; }
.bd-step { position: relative; min-height: 190px; padding: 24px; border-radius: 8px; background: #fff; border: 1px solid var(--line); box-shadow: 0 14px 30px rgba(50,5,7,.08); counter-increment: steps; }
.bd-step::before { content: counter(steps, decimal-leading-zero); margin-bottom: 22px; }
.news { background: rgba(255,255,255,.54); }
.bd-article-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.bd-article-card { overflow: hidden; border-radius: 8px; background: #fff; border: 1px solid var(--line); box-shadow: 0 14px 30px rgba(50,5,7,.08); }
.bd-article-card img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.bd-article-body { padding: 18px; }
.bd-faq-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.bd-faq { padding: 22px; border-radius: 8px; background: #fff; border: 1px solid var(--line); box-shadow: 0 14px 30px rgba(50,5,7,.07); }
.bd-page { background: linear-gradient(180deg, #fff 0%, var(--paper-2) 100%); }
.bd-page-hero { color: #fff; background: radial-gradient(circle at 70% 20%, rgba(255,227,138,.18), transparent 24%), linear-gradient(135deg, #170303 0%, #65080c 62%, #075a35 120%); padding: 58px 0; }
.bd-page-hero.article { background: linear-gradient(135deg, #170303 0%, #3f0508 55%, #120202 100%); }
.bd-page-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 36px; align-items: center; }
.bd-page-grid h1 { margin-bottom: 14px; color: #fff; font-size: clamp(38px, 5vw, 64px); line-height: 1; font-weight: 900; text-transform: uppercase; }
.bd-page-grid p { color: rgba(255,249,237,.9); font-size: 18px; font-weight: 700; }
.bd-page-grid img { width: 100%; border-radius: 8px; box-shadow: 0 22px 54px rgba(0,0,0,.34); aspect-ratio: 4 / 3; object-fit: cover; }
.bd-kicker { color: var(--gold-300); margin-bottom: 10px; }
.bd-content-grid { display: grid; grid-template-columns: minmax(0, 1fr) 330px; gap: 30px; align-items: start; }
.bd-prose { padding: clamp(22px, 4vw, 42px); border-radius: 8px; background: #fff; border: 1px solid var(--line); box-shadow: 0 14px 30px rgba(50,5,7,.08); }
.bd-prose h2 { margin: 26px 0 10px; color: var(--red-800); font-size: 28px; line-height: 1.12; }
.bd-prose h2:first-child { margin-top: 0; }
.bd-prose p, .bd-prose li { color: #3b302b; font-size: 17px; font-weight: 600; }
.bd-side { display: grid; gap: 12px; padding: 18px; border-radius: 8px; background: #fff; border: 1px solid var(--line); box-shadow: 0 14px 30px rgba(50,5,7,.08); }
.bd-side h3 { margin: 0 0 8px; color: var(--red-800); font-size: 22px; }
.bd-side a { display: grid; gap: 4px; padding: 14px; border-radius: 8px; background: var(--paper-2); border: 1px solid var(--line); }
.bd-side strong { color: var(--red-800); line-height: 1.2; }
.bd-side span { color: var(--muted); font-size: 13px; font-weight: 700; }
.bd-footer { color: rgba(255,249,237,.84); background: #170303; padding: 42px 0; }
.bd-footer-inner { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 28px; }
.bd-footer strong { display: block; margin-bottom: 12px; color: var(--gold-300); font-size: 18px; }
.bd-footer p { margin: 0; font-size: 14px; }
.bd-footer a { display: block; margin: 8px 0; color: rgba(255,249,237,.84); font-size: 14px; font-weight: 700; }
@media (max-width: 960px) {
  .bd-top, .bd-split, .bd-page-grid, .bd-content-grid, .bd-footer-inner { grid-template-columns: 1fr; display: grid; }
  .bd-top { justify-items: start; padding: 16px 0; }
  .bd-category-grid, .bd-visual-grid, .bd-article-grid, .bd-step-grid, .bd-faq-grid { grid-template-columns: repeat(2, 1fr); }
  .bd-page-grid img { max-width: 560px; }
}
@media (max-width: 640px) {
  .bd-container { width: min(100% - 28px, var(--max)); }
  .bd-logo-mark { width: 52px; height: 52px; font-size: 20px; }
  .bd-logo-text strong { font-size: 30px; }
  .bd-actions { width: 100%; justify-content: flex-start; }
  .bd-btn { min-height: 42px; padding: 0 16px; font-size: 12px; }
  .bd-nav-inner { justify-content: flex-start; overflow-x: auto; flex-wrap: nowrap; padding: 8px 0; }
  .bd-nav a { flex: 0 0 auto; }
  .bd-hero { min-height: 620px; background-position: 58% center; }
  .bd-hero h1 { font-size: clamp(43px, 17vw, 72px); }
  .bd-hero p { font-size: 17px; }
  .bd-intro-box { border-width: 4px; }
  .bd-category-grid, .bd-visual-grid, .bd-article-grid, .bd-step-grid, .bd-faq-grid { grid-template-columns: 1fr; }
  .bd-feature-visual { min-height: 270px; }
  .bd-page-hero { padding: 40px 0; }
  .bd-page-grid h1 { font-size: clamp(34px, 11vw, 52px); }
  .bd-content-grid { grid-template-columns: 1fr; }
  .bd-footer-inner { grid-template-columns: 1fr; }
}