:root { color-scheme: light; --blue: #1D6FE0; --ink: #1B2B34; --muted: #4A5B66; --line: #D8E3EA; --bg: #F2F8FF; }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans Bengali", "Hind Siliguri", sans-serif; line-height: 1.65; }
header { background: #fff; border-bottom: 1px solid var(--line); }
header .bar, main, footer { max-width: 48rem; margin: 0 auto; padding: 1rem 1.25rem; }
header .bar { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: .5rem; }
header a.brand { font-weight: 700; color: var(--blue); text-decoration: none; font-size: 1.2rem; }
nav a { margin-left: 1rem; color: var(--muted); text-decoration: none; font-size: .95rem; }
nav a:hover { color: var(--blue); }
main { padding-top: 1.5rem; padding-bottom: 3rem; }
h1 { font-size: 1.7rem; margin: .5rem 0 1rem; }
h2 { font-size: 1.2rem; margin: 2rem 0 .5rem; color: #123; }
p, li { color: var(--ink); }
li { margin: .25rem 0; }
.muted { color: var(--muted); font-size: .92rem; }
.card { background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 1rem 1.25rem; margin: 1rem 0; }
.lang { border-top: 3px solid var(--blue); margin-top: 2.5rem; padding-top: .5rem; }
table { border-collapse: collapse; width: 100%; background: #fff; font-size: .95rem; }
th, td { border: 1px solid var(--line); padding: .5rem .7rem; text-align: left; vertical-align: top; }
th { background: #EAF2FB; }
footer { color: var(--muted); font-size: .9rem; border-top: 1px solid var(--line); }
a { color: var(--blue); }