/* The user manual (static/manual). Built on the website's tokens, /css/ui-tokens.css, linked
   before this file: dark only, the same accent, spacing and radii. No webfont from outside: Bangla
   letters come from the server's own Noto Sans Bengali (static/fonts), as on the website. */
@font-face { font-family: "AIS Bangla"; src: url("/fonts/NotoSansBengali-Regular.ttf") format("truetype"); font-weight: 400; font-display: swap; unicode-range: U+0980-09FF, U+200C-200D, U+25CC; }
@font-face { font-family: "AIS Bangla"; src: url("/fonts/NotoSansBengali-SemiBold.ttf") format("truetype"); font-weight: 600; font-display: swap; unicode-range: U+0980-09FF, U+200C-200D, U+25CC; }
@font-face { font-family: "AIS Bangla"; src: url("/fonts/NotoSansBengali-Bold.ttf") format("truetype"); font-weight: 700; font-display: swap; unicode-range: U+0980-09FF, U+200C-200D, U+25CC; }

html { color-scheme: dark; -webkit-text-size-adjust: 100%; }
*, *::before, *::after { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--background);
  color: var(--text-primary);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "AIS Bangla", "Noto Sans Bengali", sans-serif;
  font-size: 16px;
  line-height: 1.6;
}
:lang(bn) { line-height: 1.75; }
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { color: var(--accent-hover); }
:where(a, summary):focus-visible { outline: none; box-shadow: var(--focus-ring); border-radius: var(--radius-sm); }
b, strong { font-weight: 600; color: var(--text-primary); }
code, .code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.92em; color: var(--accent); }

.skip { position: absolute; left: -9999px; }
.skip:focus { left: var(--spacing-4); top: var(--spacing-2); z-index: 10; background: var(--surface); padding: var(--spacing-2) var(--spacing-3); }

/* The bar at the top: the logo, the other language, sign in. */
.top {
  position: sticky; top: 0; z-index: 5;
  display: flex; align-items: center; justify-content: space-between; gap: var(--spacing-3);
  padding: var(--spacing-3) var(--spacing-4);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: var(--spacing-3); text-decoration: none; color: var(--text-primary); }
.brand:hover { color: var(--text-primary); }
.logo {
  display: inline-grid; place-items: center; width: 36px; height: 36px;
  border-radius: var(--radius-md); background: var(--accent); color: var(--text-on-accent);
  font-weight: 700; font-size: 18px;
}
.name { display: flex; flex-direction: column; font-weight: 700; line-height: 1.2; }
.name small { font-weight: 600; font-size: var(--type-label-size); color: var(--text-secondary); letter-spacing: 0.02em; }
.top-links { display: flex; gap: var(--spacing-2); flex-wrap: wrap; justify-content: flex-end; }
.chip {
  display: inline-flex; align-items: center; min-height: 40px;
  padding: var(--control-padding-y) var(--spacing-4);
  border: 1px solid var(--border-strong); border-radius: var(--radius-md);
  background: var(--surface-raised); color: var(--text-primary);
  font-weight: 600; font-size: var(--type-body-size); text-decoration: none;
}
.chip:hover { color: var(--text-primary); border-color: var(--text-secondary); }
.chip.accent { background: var(--accent); border-color: var(--accent); color: var(--text-on-accent); }
.chip.accent:hover { background: var(--accent-hover); color: var(--text-on-accent); }

/* Chapters beside the text from a laptop up; folded at the top of the text below that. */
.layout { display: block; max-width: 1280px; margin: 0 auto; }
main { min-width: 0; max-width: 860px; padding: var(--spacing-6) var(--spacing-4) var(--spacing-16); }
.toc ol { list-style: none; margin: 0; padding: 0; }
.toc li a, .toc-home {
  display: flex; gap: var(--spacing-2); align-items: baseline;
  padding: var(--spacing-2) var(--spacing-3); border-radius: var(--radius-md);
  color: var(--text-secondary); text-decoration: none; font-size: var(--type-body-size); line-height: 1.4;
}
.toc li a:hover, .toc-home:hover { background: var(--surface-raised); color: var(--text-primary); }
.toc a[aria-current="page"] { background: var(--surface-raised); color: var(--accent); font-weight: 600; }
.toc .n { min-width: 1.6em; text-align: right; color: var(--text-disabled); font-variant-numeric: tabular-nums; }
.toc a[aria-current="page"] .n { color: var(--accent); }
.toc.side { display: none; }
.toc.fold {
  margin-bottom: var(--spacing-6);
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg);
}
.toc.fold summary { cursor: pointer; padding: var(--spacing-3) var(--spacing-4); font-weight: 600; min-height: 48px; display: flex; align-items: center; }
.toc.fold > :not(summary) { margin: 0 var(--spacing-2); }
.toc.fold ol { padding-bottom: var(--spacing-2); }
@media (min-width: 1024px) {
  .layout { display: grid; grid-template-columns: 280px minmax(0, 1fr); gap: var(--spacing-8); padding: 0 var(--spacing-6); }
  .toc.side {
    display: block; position: sticky; top: 73px; align-self: start;
    max-height: calc(100vh - 73px); overflow-y: auto; padding: var(--spacing-6) 0;
  }
  .toc.fold { display: none; }
  main { padding: var(--spacing-8) 0 var(--spacing-16); }
}

/* Text */
h1 { font-size: 30px; line-height: 1.25; margin: 0 0 var(--spacing-4); font-weight: 700; }
h2 {
  font-size: 22px; line-height: 1.3; margin: var(--spacing-12) 0 var(--spacing-3); font-weight: 700;
  padding-top: var(--spacing-6); border-top: 1px solid var(--border);
}
h3 { font-size: 18px; line-height: 1.35; margin: var(--spacing-8) 0 var(--spacing-2); font-weight: 600; }
h1 + h2, .who + h2 { border-top: 0; padding-top: 0; margin-top: var(--spacing-8); }
p { margin: 0 0 var(--spacing-3); }
.eyebrow { margin: 0 0 var(--spacing-1); color: var(--accent); font-size: var(--type-label-size); font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; }
.lead { font-size: 18px; color: var(--text-secondary); }
ul.plain { padding-left: var(--spacing-6); margin: 0 0 var(--spacing-4); }
ul.plain li { margin-bottom: var(--spacing-1); }

/* Who does it, a note, a warning */
.who, .note, .warn {
  border-radius: var(--radius-lg); padding: var(--spacing-3) var(--spacing-4); margin: 0 0 var(--spacing-4);
  border: 1px solid var(--border); background: var(--surface);
}
.who { border-color: var(--info-border); background: var(--info-bg); }
.note { border-color: var(--neutral-border); background: var(--neutral-bg); }
.warn { border-color: var(--warning-border); background: var(--warning-bg); }
.who > :last-child, .note > :last-child, .warn > :last-child { margin-bottom: 0; }

/* Numbered steps: a big number, a sentence or two, the screenshot. */
ol.steps { list-style: none; counter-reset: step; margin: 0 0 var(--spacing-6); padding: 0; }
ol.steps > li {
  counter-increment: step; position: relative;
  padding: 0 0 var(--spacing-6) 52px; margin: 0;
}
ol.steps > li::before {
  content: counter(step); position: absolute; left: 0; top: 0;
  width: 36px; height: 36px; border-radius: var(--radius-full);
  display: grid; place-items: center;
  background: var(--accent); color: var(--text-on-accent); font-weight: 700; font-size: 17px; line-height: 1;
}
ol.steps > li::after {
  content: ""; position: absolute; left: 17px; top: 42px; bottom: 6px; width: 2px; background: var(--border);
}
ol.steps > li:last-child::after { display: none; }
ol.steps > li > p:first-child { padding-top: 5px; }
:lang(bn) ol.steps > li::before { content: counter(step, bengali); }

/* Screenshots: a phone at about 300 px, the website the width of the text. Each opens full size. */
figure.shot { margin: var(--spacing-3) 0 var(--spacing-4); }
figure.shot a { display: inline-block; border-radius: var(--radius-lg); line-height: 0; }
figure.shot img {
  display: block; height: auto; max-width: 100%;
  border: 1px solid var(--border-strong); border-radius: var(--radius-lg);
  background: var(--surface); box-shadow: var(--shadow-md);
}
figure.shot.phone img { width: 300px; }
figure.shot.web a, figure.shot.web img { width: 100%; }
figure.shot figcaption { margin-top: var(--spacing-2); color: var(--text-secondary); font-size: var(--type-body-small-size); line-height: 1.5; }
.pair { display: flex; flex-wrap: wrap; gap: var(--spacing-4); }
.pair figure.shot { margin-top: 0; }

/* Tables (who does what) */
.table-wrap { overflow-x: auto; margin: 0 0 var(--spacing-6); border: 1px solid var(--border); border-radius: var(--radius-lg); }
table { width: 100%; border-collapse: collapse; font-size: var(--type-body-size); }
th, td { text-align: left; vertical-align: top; padding: var(--spacing-3); border-bottom: 1px solid var(--border); }
th { background: var(--surface-raised); color: var(--text-secondary); font-weight: 600; font-size: var(--type-label-size); text-transform: uppercase; letter-spacing: 0.04em; }
tr:last-child td { border-bottom: 0; }
@media (max-width: 640px) {
  table.stack thead { display: none; }
  table.stack tr { display: block; padding: var(--spacing-2) 0; border-bottom: 1px solid var(--border); }
  table.stack tr:last-child { border-bottom: 0; }
  table.stack td { display: block; border: 0; padding: var(--spacing-1) var(--spacing-3); }
  table.stack td::before { content: attr(data-label); display: block; color: var(--text-secondary); font-size: var(--type-label-size); font-weight: 600; }
  .table-wrap { overflow-x: visible; }
}

/* The chapters on the first page */
.cards { list-style: none; padding: 0; margin: 0 0 var(--spacing-6); display: grid; gap: var(--spacing-3); grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
.cards a {
  display: block; height: 100%; padding: var(--spacing-4); text-decoration: none;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); color: var(--text-primary);
}
.cards a:hover { border-color: var(--accent); color: var(--text-primary); }
.cards .n { display: block; color: var(--accent); font-weight: 700; font-size: var(--type-label-size); letter-spacing: 0.06em; }
.cards strong { display: block; font-size: 17px; margin: var(--spacing-1) 0; }
.cards span.what { display: block; color: var(--text-secondary); font-size: var(--type-body-small-size); line-height: 1.5; }

/* A download (the wall card) */
.downloads { display: flex; flex-wrap: wrap; gap: var(--spacing-2); margin: 0 0 var(--spacing-4); }

/* Previous / next */
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: var(--spacing-3); margin-top: var(--spacing-12); }
.pager a {
  display: flex; flex-direction: column; gap: var(--spacing-1); padding: var(--spacing-3) var(--spacing-4);
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg);
  text-decoration: none; color: var(--text-primary); min-height: 64px;
}
.pager a:hover { border-color: var(--accent); color: var(--text-primary); }
.pager a.next { text-align: right; grid-column: 2; }
.pager small { color: var(--text-secondary); font-size: var(--type-label-size); font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; }
.foot { margin-top: var(--spacing-6); color: var(--text-secondary); }