:root {
  --blue: #446084;
  --blue-dark: #22364f;
  --red: #dd3333;
  --red-dark: #b82323;
  --ink: #202733;
  --muted: #6a7482;
  --line: #dbe1e9;
  --soft: #f4f6fa;
  --white: #ffffff;
  --footer: #5b5b5b;
  --shadow: 0 16px 36px rgba(30, 45, 68, .13);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--soft);
  color: var(--ink);
  font-family: "Noto Sans Bengali", "Hind Siliguri", "Nirmala UI", Arial, sans-serif;
  line-height: 1.72;
  letter-spacing: 0;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
p { margin: 0; color: var(--muted); }
h1, h2, h3 { margin: 0; line-height: 1.26; letter-spacing: 0; }
.shell { width: min(1060px, calc(100% - 32px)); margin: 0 auto; }
.top {
  background: #fff;
  border-bottom: 1px solid var(--line);
}
.top-inner {
  min-height: 82px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 3px;
  font-weight: 950;
  font-style: italic;
  line-height: 1;
  white-space: nowrap;
}
.brand .num { color: var(--red); font-size: 54px; text-shadow: 0 3px 0 rgba(0,0,0,.1); }
.brand .txt { color: var(--blue-dark); font-size: 42px; }
.actions { display: flex; gap: 10px; flex-wrap: wrap; justify-content: flex-end; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 10px 20px;
  border-radius: 4px;
  border: 1px solid rgba(255,255,255,.35);
  background: var(--red);
  color: #fff;
  font-weight: 900;
  box-shadow: 0 6px 12px rgba(221, 51, 51, .24);
}
.btn.alt { background: var(--blue); box-shadow: none; }
.menu {
  background: var(--blue);
  color: #fff;
  box-shadow: inset 0 -4px 0 var(--red);
}
.menu-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1px;
  flex-wrap: wrap;
  scrollbar-width: none;
}
.menu-inner::-webkit-scrollbar { display: none; }
.menu a {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  padding: 0 15px;
  font-size: 14px;
  font-weight: 900;
}
.menu a:hover,
.menu a.active { background: rgba(0,0,0,.14); }
.redbar {
  background: var(--red);
  color: #fff;
  font-size: 13px;
  font-weight: 800;
}
.redbar .shell {
  display: flex;
  min-height: 34px;
  align-items: center;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
}
.hero {
  padding: 28px 0 18px;
}
.hero img {
  width: 100%;
  aspect-ratio: 1568 / 768;
  object-fit: cover;
  border: 1px solid #c9d4e1;
  box-shadow: var(--shadow);
}
.crumb {
  margin-top: 6px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}
.section { padding: 34px 0; }
.panel {
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.intro {
  padding: 36px;
}
.title {
  text-align: center;
  margin-bottom: 22px;
}
.title h1 { font-size: clamp(28px, 4vw, 44px); color: var(--blue-dark); }
.title h2 { font-size: clamp(24px, 3vw, 34px); color: var(--blue-dark); }
.title:after {
  content: "";
  display: block;
  width: 86px;
  height: 4px;
  margin: 16px auto 0;
  background: var(--red);
}
.copy {
  border-left: 4px solid var(--red);
  padding-left: 24px;
  max-width: 860px;
  margin: 0 auto;
  font-size: 16px;
}
.copy p + p { margin-top: 15px; }
.note {
  background: #fff5f5;
  border: 1px solid #ffd0d0;
  color: var(--red-dark);
  padding: 12px 14px;
  font-weight: 800;
}
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
.step {
  background: #fff;
  border: 1px solid var(--line);
  border-top: 4px solid var(--red);
  padding: 20px;
  min-height: 168px;
  box-shadow: 0 10px 22px rgba(30,45,68,.08);
}
.step span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  background: var(--blue);
  color: #fff;
  font-weight: 950;
  margin-bottom: 12px;
}
.step h3 { font-size: 18px; color: var(--blue-dark); margin-bottom: 8px; }
.feature {
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  gap: 26px;
  align-items: center;
}
.feature img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.list { margin-top: 18px; display: grid; gap: 10px; }
.list div {
  display: grid;
  grid-template-columns: 54px 1fr;
  gap: 12px;
  align-items: start;
  background: #fff;
  border: 1px solid var(--line);
  padding: 12px 14px;
}
.list b { color: var(--red); font-weight: 950; }
.cat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.cat {
  background: #fff;
  border: 1px solid var(--line);
  border-top: 4px solid var(--blue);
  padding: 18px;
  min-height: 184px;
  box-shadow: 0 12px 24px rgba(30,45,68,.08);
}
.cat h3 { color: var(--blue-dark); font-size: 19px; margin-bottom: 8px; }
.cat p { font-size: 14px; }
.cat a { color: var(--red); font-weight: 900; display: inline-block; margin-top: 12px; }
.post-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.post {
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: 0 12px 24px rgba(30,45,68,.08);
  display: flex;
  flex-direction: column;
}
.post img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-bottom: 1px solid var(--line);
}
.post div { padding: 16px; display: flex; flex-direction: column; flex: 1; }
.post small { color: var(--red); font-weight: 900; margin-bottom: 6px; }
.post h3 { font-size: 18px; color: var(--blue-dark); margin-bottom: 8px; }
.post p { font-size: 14px; flex: 1; }
.post a { margin-top: 12px; color: var(--red); font-weight: 900; }
.subhero {
  background: linear-gradient(135deg, var(--blue-dark), var(--blue));
  color: #fff;
  padding: 42px 0;
  border-bottom: 5px solid var(--red);
}
.subhero h1 { font-size: clamp(28px, 4vw, 42px); max-width: 920px; }
.subhero p { color: #e8edf4; max-width: 850px; margin-top: 12px; }
.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 24px;
  align-items: start;
}
.article {
  background: #fff;
  border: 1px solid var(--line);
  padding: 28px;
  box-shadow: var(--shadow);
}
.meta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 13px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 12px;
  margin-bottom: 18px;
}
.summary {
  border-left: 4px solid var(--red);
  background: #fff7f7;
  padding: 14px 16px;
  color: var(--ink);
  font-weight: 800;
  margin-bottom: 20px;
}
figure { margin: 0 0 24px; }
figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid var(--line);
}
figcaption { margin-top: 8px; font-size: 13px; color: var(--muted); }
.body h2 { color: var(--blue-dark); font-size: 28px; margin: 28px 0 10px; }
.body h3 { color: var(--blue-dark); font-size: 21px; margin: 22px 0 8px; }
.body p + p { margin-top: 14px; }
.body ul { padding-left: 22px; color: var(--muted); }
.body li + li { margin-top: 8px; }
.check-table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0;
  font-size: 15px;
}
.check-table th,
.check-table td {
  border: 1px solid var(--line);
  padding: 12px;
  text-align: left;
  vertical-align: top;
}
.check-table th { background: #eef3f8; color: var(--blue-dark); }
.warning {
  border: 1px solid #f2c8c8;
  background: #fff8f2;
  padding: 16px;
  margin: 20px 0;
  color: #8a3a2a;
  font-weight: 800;
}
.faq details {
  border: 1px solid var(--line);
  background: #fff;
  margin-top: 10px;
  padding: 13px 15px;
}
.faq summary { cursor: pointer; font-weight: 900; color: var(--blue-dark); }
.faq p { margin-top: 10px; }
.side {
  background: #fff;
  border: 1px solid var(--line);
  padding: 20px;
  box-shadow: 0 12px 24px rgba(30,45,68,.08);
}
.side h2 { font-size: 22px; color: var(--blue-dark); margin-bottom: 12px; }
.side a {
  display: block;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  color: var(--red);
  font-weight: 800;
}
.strip {
  background: var(--blue-dark);
  color: #fff;
  padding: 26px 0;
}
.strip-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
.strip-card {
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.16);
  padding: 18px;
}
.strip-card h3,
.strip-card b { color: #fff; font-size: 21px; display: block; margin-bottom: 8px; }
.strip-card p { color: #dce6f1; }
.footer {
  background: var(--footer);
  color: #e8e8e8;
  padding: 36px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 24px;
}
.footer p { color: #e2e2e2; }
.footer h3 { color: #fff; font-size: 18px; margin-bottom: 10px; }
.footer a { display: block; color: #fff; margin: 6px 0; }
.copybar { background: #3d3d3d; margin-top: 30px; padding: 12px 0; text-align: center; font-size: 13px; }
.pager { text-align: center; margin-top: 22px; }
.pager a { display: inline-flex; padding: 9px 18px; border: 1px solid var(--line); background: #fff; color: var(--blue); font-weight: 900; }
@media (max-width: 900px) {
  .top-inner { align-items: flex-start; flex-direction: column; padding: 18px 0; }
  .actions { justify-content: flex-start; }
  .brand .num { font-size: 43px; }
  .brand .txt { font-size: 34px; }
  .menu-inner { justify-content: flex-start; overflow-x: auto; flex-wrap: nowrap; }
  .menu a { flex: 0 0 auto; }
  .hero { padding-top: 18px; }
  .intro { padding: 22px; }
  .steps, .cat-grid, .post-grid, .strip-grid, .footer-grid { grid-template-columns: 1fr 1fr; }
  .feature, .layout { grid-template-columns: 1fr; }
  .side { order: 2; }
}
@media (max-width: 560px) {
  .shell { width: min(100% - 22px, 1060px); }
  .redbar .shell { justify-content: flex-start; gap: 10px; }
  .steps, .cat-grid, .post-grid, .strip-grid, .footer-grid { grid-template-columns: 1fr; }
  .top-inner { gap: 14px; }
  .btn { width: 100%; }
  .actions { width: 100%; display: grid; grid-template-columns: 1fr 1fr; }
  .hero img { aspect-ratio: 16 / 9; }
  .copy { padding-left: 16px; }
  .section { padding: 26px 0; }
  .article { padding: 18px; }
  .body h2 { font-size: 24px; }
}