/* ECE user guide — shared stylesheet for every guide page (EN + BN).
   Self-contained: no external fonts, no CDN, works from file:// as well as a web server. */

:root {
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --border: #e2e8f0;
  --primary: #1d4ed8;
  --primary-soft: #eff6ff;
  --accent: #0f766e;
  --warn-bg: #fffbeb;
  --warn-border: #fcd34d;
  --tip-bg: #ecfdf5;
  --tip-border: #6ee7b7;
  --code-bg: #f1f5f9;
  --sidebar-w: 290px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1120;
    --card: #111827;
    --text: #e5e7eb;
    --muted: #94a3b8;
    --border: #1f2a3c;
    --primary: #60a5fa;
    --primary-soft: #16233c;
    --accent: #5eead4;
    --warn-bg: #2a2413;
    --warn-border: #a16207;
    --tip-bg: #0f2a22;
    --tip-border: #15803d;
    --code-bg: #17202f;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 1rem; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", Roboto, "Noto Sans Bengali", "Nirmala UI", system-ui, sans-serif;
  font-size: 15.5px;
  line-height: 1.7;
}

body.bn { font-size: 16.5px; line-height: 1.85; }

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Layout ─────────────────────────────────────────────────────────── */
.layout { display: flex; align-items: flex-start; max-width: 1400px; margin: 0 auto; }

nav.toc {
  position: sticky;
  top: 0;
  width: var(--sidebar-w);
  flex: 0 0 var(--sidebar-w);
  height: 100vh;
  overflow-y: auto;
  padding: 1.5rem 1rem 3rem;
  border-right: 1px solid var(--border);
  background: var(--card);
}
nav.toc .brand { font-weight: 700; font-size: 1rem; margin-bottom: .25rem; }
nav.toc .brand small { display: block; font-weight: 400; color: var(--muted); font-size: .8rem; }
nav.toc ol { list-style: none; margin: 1rem 0 0; padding: 0; }
nav.toc li { margin: 0; }
nav.toc a {
  display: block;
  padding: .3rem .55rem;
  border-radius: 6px;
  color: var(--text);
  font-size: .89rem;
}
nav.toc a:hover { background: var(--primary-soft); text-decoration: none; }
nav.toc .sub a { padding-left: 1.5rem; color: var(--muted); font-size: .85rem; }
nav.toc .langswitch {
  display: flex; gap: .4rem; margin-top: 1.25rem; padding-top: 1rem;
  border-top: 1px solid var(--border);
}
nav.toc .langswitch a {
  flex: 1; text-align: center; border: 1px solid var(--border);
  border-radius: 6px; font-size: .82rem; padding: .3rem;
}

main {
  flex: 1 1 auto;
  min-width: 0;
  padding: 2.25rem 2.5rem 6rem;
}

@media (max-width: 900px) {
  .layout { flex-direction: column; }
  nav.toc { position: static; width: 100%; flex: none; height: auto; border-right: none; border-bottom: 1px solid var(--border); }
  main { padding: 1.5rem 1.1rem 4rem; }
}

/* ── Typography ─────────────────────────────────────────────────────── */
h1 { font-size: 1.9rem; margin: 0 0 .4rem; line-height: 1.3; }
h2 {
  font-size: 1.32rem; margin: 2.8rem 0 .9rem; padding-bottom: .35rem;
  border-bottom: 2px solid var(--border);
}
h3 { font-size: 1.08rem; margin: 1.9rem 0 .5rem; }
h4 { font-size: .97rem; margin: 1.3rem 0 .35rem; color: var(--accent); }
p { margin: .6rem 0; }
.lead { color: var(--muted); font-size: 1.02rem; }

code, .k {
  background: var(--code-bg); border-radius: 4px; padding: .08em .38em;
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace; font-size: .88em;
}
.path { color: var(--accent); font-weight: 600; }

/* ── Cards, tables, callouts ────────────────────────────────────────── */
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 10px; padding: 1rem 1.15rem; margin: 1rem 0;
}
.card > h3, .card > h4 { margin-top: .2rem; }

.grid { display: grid; gap: .9rem; grid-template-columns: repeat(auto-fit, minmax(255px, 1fr)); }

.table-wrap { overflow-x: auto; margin: 1rem 0; }
table { border-collapse: collapse; width: 100%; background: var(--card); font-size: .92rem; }
th, td { text-align: left; padding: .55rem .7rem; border: 1px solid var(--border); vertical-align: top; }
th { background: var(--primary-soft); font-weight: 600; }
td.num, th.num { text-align: right; }

.note, .warn, .tip {
  border-radius: 8px; padding: .7rem .95rem; margin: 1rem 0;
  border-left: 4px solid var(--primary); background: var(--primary-soft);
}
.warn { border-left-color: var(--warn-border); background: var(--warn-bg); }
.tip { border-left-color: var(--tip-border); background: var(--tip-bg); }
.note p:first-child, .warn p:first-child, .tip p:first-child { margin-top: 0; }
.note p:last-child, .warn p:last-child, .tip p:last-child { margin-bottom: 0; }

ul, ol { padding-left: 1.4rem; }
li { margin: .25rem 0; }

.badge {
  display: inline-block; font-size: .72rem; font-weight: 600; letter-spacing: .02em;
  padding: .1rem .45rem; border-radius: 999px; border: 1px solid var(--border);
  background: var(--code-bg); color: var(--muted); vertical-align: middle;
}
.badge.admin { border-color: var(--warn-border); background: var(--warn-bg); color: #92400e; }
@media (prefers-color-scheme: dark) { .badge.admin { color: #fbbf24; } }

.steps { counter-reset: s; list-style: none; padding-left: 0; }
.steps > li { counter-increment: s; position: relative; padding-left: 2.2rem; margin: .55rem 0; }
.steps > li::before {
  content: counter(s); position: absolute; left: 0; top: .15rem;
  width: 1.55rem; height: 1.55rem; border-radius: 999px;
  background: var(--primary); color: #fff; font-size: .8rem; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}

.hero {
  background: var(--card); border: 1px solid var(--border); border-radius: 12px;
  padding: 1.4rem 1.6rem; margin-bottom: 1.5rem;
}

footer.docfoot {
  margin-top: 3rem; padding-top: 1rem; border-top: 1px solid var(--border);
  color: var(--muted); font-size: .85rem;
}

/* Landing page (index.html) */
.hub { max-width: 940px; margin: 0 auto; padding: 3rem 1.25rem 5rem; }
.hub .cardlink {
  display: block; background: var(--card); border: 1px solid var(--border);
  border-radius: 12px; padding: 1.15rem 1.3rem; color: var(--text);
}
.hub .cardlink:hover { border-color: var(--primary); text-decoration: none; }
.hub .cardlink strong { display: block; font-size: 1.05rem; }
.hub .cardlink span { color: var(--muted); font-size: .9rem; }

@media print {
  nav.toc { display: none; }
  main { padding: 0; }
  body { background: #fff; font-size: 11pt; }
  h2 { break-after: avoid; }
  .card, table { break-inside: avoid; }
}