:root {
  --ok37-black: #111111;
  --ok37-charcoal: #1a1a1a;
  --ok37-gold: #f2b31a;
  --ok37-amber: #ffcf45;
  --ok37-red: #c61516;
  --ok37-teal: #00766f;
  --ok37-text: #555555;
  --ok37-muted: #777777;
  --ok37-line: #e9e9e9;
  --ok37-soft: #f4f4f4;
  --ok37-wrap: 1080px;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: #ffffff;
  color: var(--ok37-text);
  font-family: "Noto Sans Bengali", "Noto Sans", "Segoe UI", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.72;
}
a { color: #1567b2; text-decoration: none; }
a:hover { color: var(--ok37-red); }
img { max-width: 100%; display: block; }
.ok37-wrap { width: min(var(--ok37-wrap), calc(100% - 32px)); margin: 0 auto; }
.ok37-header { background: var(--ok37-black); position: relative; z-index: 3; }
.ok37-top { background: #111; border-bottom: 1px solid #282828; }
.ok37-top-inner { min-height: 70px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.ok37-logo {
  color: #ffffff;
  font-weight: 900;
  font-size: 30px;
  letter-spacing: 0;
  display: inline-flex;
  align-items: baseline;
  gap: 2px;
  line-height: 1;
}
.ok37-logo span { color: var(--ok37-gold); }
.ok37-logo small { color: #cfcfcf; font-size: 12px; margin-left: 10px; font-weight: 700; }
.ok37-actions { display: flex; gap: 10px; flex-wrap: wrap; justify-content: flex-end; }
.ok37-actions a {
  color: #fff;
  background: #236bc9;
  border-radius: 18px;
  padding: 7px 14px;
  font-size: 13px;
  font-weight: 800;
  box-shadow: inset 0 -2px 0 rgba(0, 0, 0, .25);
}
.ok37-nav { background: #221707; border-bottom: 3px solid var(--ok37-gold); }
.ok37-nav-inner { display: flex; justify-content: center; gap: 4px; flex-wrap: wrap; }
.ok37-nav a {
  color: #f8f1d6;
  font-size: 14px;
  font-weight: 900;
  padding: 13px 14px 11px;
  text-transform: none;
}
.ok37-nav a.active, .ok37-nav a:hover { color: #111; background: var(--ok37-gold); }
.ok37-hero { background: #000; }
.ok37-hero img {
  width: 100%;
  max-height: 430px;
  object-fit: cover;
  object-position: center;
}
.ok37-main-title {
  max-width: 840px;
  text-align: center;
  padding: 24px 0 18px;
}
.ok37-main-title h1 {
  margin: 0 auto 10px;
  color: #333;
  font-size: 25px;
  line-height: 1.35;
  font-weight: 900;
}
.ok37-main-title p { margin: 0; color: #686868; font-size: 15px; }
.ok37-content {
  max-width: 820px;
  padding: 14px 0 34px;
}
.ok37-content h2,
.ok37-article-box h2 {
  color: #333;
  font-size: 23px;
  line-height: 1.35;
  margin: 30px 0 12px;
  font-weight: 900;
}
.ok37-content p, .ok37-article-box p { margin: 0 0 16px; }
.ok37-figure { margin: 24px auto; max-width: 800px; background: #fff; }
.ok37-figure img { width: 100%; border: 1px solid #d7d7d7; }
.ok37-figure figcaption {
  background: linear-gradient(90deg, #ff9e00, #ffc52f);
  color: #fff;
  font-weight: 900;
  text-align: center;
  padding: 9px 12px;
  margin: 0;
}
.ok37-note {
  background: #f5f5f5;
  border-left: 4px solid var(--ok37-gold);
  color: #4d4d4d;
  padding: 14px 16px;
  margin: 22px 0;
  font-weight: 700;
}
.ok37-section { padding: 18px 0 42px; }
.ok37-section-title { text-align: center; max-width: 780px; margin: 0 auto 24px; }
.ok37-section-title h2 { margin: 0 0 6px; color: #333; font-size: 25px; font-weight: 900; }
.ok37-section-title p { margin: 0; color: #777; }
.ok37-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.ok37-card {
  background: #fff;
  border: 1px solid var(--ok37-line);
  box-shadow: 0 8px 20px rgba(0,0,0,.06);
}
.ok37-card img { aspect-ratio: 4 / 3; object-fit: cover; width: 100%; }
.ok37-card div { padding: 15px; }
.ok37-card span { color: var(--ok37-red); font-weight: 900; font-size: 13px; }
.ok37-card h3 { margin: 6px 0 8px; font-size: 19px; line-height: 1.35; }
.ok37-card h3 a { color: #222; }
.ok37-card p { margin: 0 0 10px; color: #666; font-size: 15px; }
.ok37-more { font-weight: 900; color: #1262aa; }
.ok37-two {
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: 28px;
  align-items: center;
  border-top: 1px solid var(--ok37-line);
  border-bottom: 1px solid var(--ok37-line);
  padding: 36px 0;
}
.ok37-two h2 { margin-top: 0; color: #333; font-size: 26px; }
.ok37-two ul, .ok37-article-box ul { padding-left: 22px; }
.ok37-red-btn,
.ok37-ghost-btn {
  display: inline-block;
  border-radius: 4px;
  padding: 10px 16px;
  margin: 6px 8px 6px 0;
  font-weight: 900;
}
.ok37-red-btn { color: #fff; background: linear-gradient(#e82020, #b70d0d); box-shadow: 0 4px 0 #7c0808; }
.ok37-red-btn:hover { color: #fff; filter: brightness(1.05); }
.ok37-ghost-btn { color: #222; background: var(--ok37-gold); }
.ok37-faq details {
  border: 1px solid var(--ok37-line);
  background: #fff;
  margin: 10px 0;
  padding: 12px 14px;
}
.ok37-faq summary { cursor: pointer; color: #333; font-weight: 900; }
.ok37-faq p { margin-top: 10px; margin-bottom: 0; }
.ok37-subhero {
  background: radial-gradient(circle at 20% 0, rgba(242,179,26,.24), transparent 38%), linear-gradient(180deg, #151515, #241707);
  color: #fff;
  padding: 42px 0;
  border-bottom: 4px solid var(--ok37-gold);
}
.ok37-subhero p { margin: 0 0 10px; color: #f2db8a; }
.ok37-subhero a { color: #ffdf59; }
.ok37-subhero h1 { margin: 0 0 10px; max-width: 880px; font-size: 34px; line-height: 1.28; color: #fff; }
.ok37-layout {
  display: grid;
  grid-template-columns: minmax(0, 760px) 270px;
  gap: 34px;
  align-items: start;
  padding: 34px 0 46px;
}
.ok37-article-box { min-width: 0; }
.ok37-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  color: #777;
  font-size: 13px;
  margin-bottom: 14px;
}
.ok37-meta span { background: #f3f3f3; padding: 5px 9px; }
.ok37-summary {
  background: #f7f7f7;
  border-top: 3px solid var(--ok37-gold);
  padding: 16px 18px;
  margin: 20px 0 24px;
}
.ok37-summary h2 { margin-top: 0; }
.ok37-body h2 { border-bottom: 1px solid var(--ok37-line); padding-bottom: 8px; }
.ok37-table { overflow-x: auto; margin: 14px 0 24px; }
.ok37-table table { width: 100%; border-collapse: collapse; min-width: 560px; }
.ok37-table th { background: #211608; color: #ffde64; }
.ok37-table th, .ok37-table td { border: 1px solid #e4e4e4; padding: 10px 12px; text-align: left; vertical-align: top; }
.ok37-warning {
  background: #fff4e5;
  border: 1px solid #ffd38c;
  padding: 16px 18px;
  margin: 26px 0;
}
.ok37-warning h2 { margin-top: 0; color: #9f1717; }
.ok37-side {
  background: #f5f5f5;
  border-top: 4px solid var(--ok37-gold);
  padding: 16px;
  position: sticky;
  top: 12px;
}
.ok37-side h2 { margin: 0 0 12px; color: #333; font-size: 20px; }
.ok37-side a {
  display: block;
  padding: 9px 0;
  border-bottom: 1px solid #ddd;
  color: #1c5d99;
  font-weight: 800;
}
.ok37-pagination { list-style: none; padding: 0; }
.ok37-prenext { display: grid; gap: 8px; margin-top: 20px; }
.ok37-footer {
  background: #f1f1f1;
  border-top: 1px solid #d9d9d9;
  color: #666;
  margin-top: 28px;
}
.ok37-footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 26px;
  padding: 38px 0 32px;
}
.ok37-footer-logo { color: #777; margin-bottom: 12px; }
.ok37-footer h3 { margin: 0 0 10px; color: #333; font-size: 16px; }
.ok37-footer a { display: block; color: #555; margin: 6px 0; font-weight: 700; }
.ok37-copy { background: #303030; color: #ddd; text-align: center; padding: 14px; font-size: 13px; }
@media (max-width: 900px) {
  .ok37-top-inner { align-items: flex-start; flex-direction: column; padding: 14px 0; }
  .ok37-nav-inner { justify-content: flex-start; overflow-x: auto; flex-wrap: nowrap; }
  .ok37-nav a { white-space: nowrap; }
  .ok37-grid, .ok37-two, .ok37-layout, .ok37-footer-grid { grid-template-columns: 1fr; }
  .ok37-side { position: static; }
  .ok37-subhero h1 { font-size: 26px; }
  .ok37-main-title h1 { font-size: 22px; }
}
@media (max-width: 520px) {
  body { font-size: 15px; }
  .ok37-wrap { width: min(100% - 22px, var(--ok37-wrap)); }
  .ok37-logo { font-size: 26px; }
  .ok37-logo small { display: block; margin: 5px 0 0; }
  .ok37-actions { width: 100%; }
  .ok37-actions a { flex: 1; text-align: center; }
  .ok37-hero img { min-height: 150px; object-position: center; }
  .ok37-main-title { padding-top: 18px; }
  .ok37-card div { padding: 13px; }
  .ok37-footer-grid { gap: 12px; }
}