:root {
  color-scheme: light dark;
  --background: #f9fafb;
  --foreground: #111827;
  --accent: #111827;
  --accent-foreground: #f9fafb;
  --muted: #6b7280;
  --card: #ffffff;
  --card-border: rgba(17, 24, 39, 0.08);
  --radius: 18px;
  font-size: 16px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--background);
  color: var(--foreground);
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

header {
  padding: clamp(2.5rem, 6vw, 4rem) clamp(1rem, 6vw, 5rem) clamp(1.5rem, 5vw, 3rem);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

header nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
}

.brand {
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.875rem;
}

.subscribe {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.55rem 1.1rem;
  border-radius: 999px;
  background: var(--accent);
  color: var(--accent-foreground);
  font-weight: 600;
  text-decoration: none;
  transition: transform 150ms ease, box-shadow 150ms ease;
}

.subscribe:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(17, 24, 39, 0.14);
  text-decoration: none;
}

.hero {
  display: grid;
  gap: 0.75rem;
  max-width: 780px;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2.4rem, 6vw, 3.2rem);
  line-height: 1.15;
  letter-spacing: -0.015em;
}

.hero p {
  margin: 0;
  color: var(--muted);
  font-size: clamp(1rem, 2.4vw, 1.15rem);
}

main {
  padding: 0 clamp(1rem, 6vw, 5rem) clamp(4rem, 10vw, 6rem);
}

.grid {
  display: grid;
  gap: 1.75rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

article {
  background: var(--card);
  border-radius: var(--radius);
  border: 1px solid var(--card-border);
  padding: 1.75rem;
  display: grid;
  gap: 0.75rem;
  transition: transform 180ms ease, box-shadow 180ms ease;
  scroll-margin-top: 5rem;
}

article:hover {
  transform: translateY(-4px);
  box-shadow: 0 22px 42px rgba(15, 23, 42, 0.12);
}

article h2 {
  margin: 0;
  font-size: 1.35rem;
}

article time {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

article p {
  margin: 0;
  color: var(--muted);
}

.read-more {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
  font-size: 0.95rem;
}

.read-more svg {
  width: 1rem;
  height: 1rem;
  transition: transform 150ms ease;
}

.read-more:hover svg {
  transform: translateX(2px);
}

.keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.keyword {
  border-radius: 999px;
  padding: 0.4rem 0.8rem;
  background: rgba(17, 24, 39, 0.06);
  font-size: 0.85rem;
  color: var(--foreground);
}

.section-intro {
  margin-top: clamp(3rem, 9vw, 5rem);
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  max-width: 780px;
}

.section-intro h2 {
  margin: 0;
  font-size: clamp(1.8rem, 5vw, 2.4rem);
}

footer {
  padding: clamp(2rem, 6vw, 3rem) clamp(1rem, 6vw, 5rem) 3rem;
  display: grid;
  gap: 0.5rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.bangla {
  font-weight: 500;
  color: var(--foreground);
}

.article-page main {
  display: grid;
  gap: clamp(2rem, 6vw, 3rem);
  max-width: 860px;
  margin: 0 auto;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.breadcrumbs a {
  color: var(--muted);
}

.article-hero {
  display: grid;
  gap: 0.75rem;
  padding: clamp(1.5rem, 5vw, 2.5rem);
  background: var(--card);
  border-radius: var(--radius);
  border: 1px solid var(--card-border);
}

.article-hero h1 {
  margin: 0;
  font-size: clamp(2.1rem, 5vw, 2.8rem);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.95rem;
  color: var(--muted);
}

.toc {
  background: var(--card);
  border-radius: var(--radius);
  border: 1px solid var(--card-border);
  padding: clamp(1.25rem, 4vw, 1.75rem);
}

.toc h2 {
  margin: 0 0 0.75rem 0;
  font-size: 1.1rem;
}

.toc ol {
  margin: 0;
  padding-left: 1.25rem;
  display: grid;
  gap: 0.5rem;
}

.article-body {
  display: grid;
  gap: clamp(1.25rem, 4vw, 1.75rem);
}

.article-body section,
.article-body p,
.article-body ul,
.article-body ol {
  margin: 0;
}

.article-body ul,
.article-body ol {
  padding-left: 1.2rem;
  display: grid;
  gap: 0.5rem;
}

.article-body pre {
  overflow-x: auto;
  margin: 0;
  background: rgba(17, 24, 39, 0.08);
  padding: 1rem;
  border-radius: 10px;
  font-size: 0.95rem;
}

.article-body code {
  background: rgba(17, 24, 39, 0.08);
  border-radius: 6px;
  padding: 0.2rem 0.4rem;
  font-family: "Fira Code", "Geist Mono", monospace;
}

.note-box {
  background: rgba(17, 24, 39, 0.06);
  border-left: 4px solid var(--accent);
  padding: 1rem 1.2rem;
  border-radius: 12px;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-weight: 600;
  color: var(--accent);
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #020617;
    --foreground: #f8fafc;
    --accent: #f8fafc;
    --accent-foreground: #020617;
    --muted: #cbd5f5;
    --card: rgba(15, 23, 42, 0.6);
    --card-border: rgba(248, 250, 252, 0.1);
  }

  article,
  .article-hero,
  .toc {
    background: linear-gradient(145deg, rgba(15, 23, 42, 0.72), rgba(2, 6, 23, 0.88));
  }

  .article-body pre,
  .article-body code,
  .note-box,
  .keyword {
    background: rgba(248, 250, 252, 0.08);
    color: var(--accent-foreground);
  }

  .keyword {
    background: rgba(248, 250, 252, 0.1);
  }
}