/* ==========================================================================
   site.css: house style for rodrigo.francalacci.com (public pages) and the
   private host (Acoustics, Electronics, Admin).
   Plain and light: Arial, black text on white, classic link colours,
   a left sidebar, small line icons (shared/icons.svg).
   On narrow screens the sidebar becomes a short menu at the top.
   Calculators keep their own VB6 theme inside their pages.
   ========================================================================== */

:root {
  --ink: #000;                     /* text */
  --paper: #fff;                   /* background */
  --red: rgb(220, 20, 60);         /* crimson: current page, highlights, notes */
  --green: rgb(34, 139, 34);       /* forest green: Acoustics, "live" */
  --blue: rgb(0, 0, 255);          /* links */
  --indigo: rgb(75, 0, 130);       /* visited links, Electronics */
  --slate: rgb(112, 128, 144);     /* secondary text, rules */
  --rule: rgb(208, 214, 220);      /* light lines */
  --side-w: 13.5rem;
  --measure: 46rem;                /* content column, about 80 characters */
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.55 Arial, Helvetica, sans-serif;
}

/* ---------- skip link (keyboard users) ---------- */
.skip { position: absolute; left: -999px; top: 0; padding: .4rem .7rem; background: var(--ink); color: var(--paper); z-index: 10; }
.skip:focus { left: .5rem; top: .5rem; }

/* ---------- icons ---------- */
.ic { width: 16px; height: 16px; flex: none; vertical-align: -3px; }
.c-red { color: var(--red); }
.c-green { color: var(--green); }
.c-blue { color: var(--blue); }
.c-indigo { color: var(--indigo); }
.c-slate { color: var(--slate); }

/* ---------- layout ---------- */
.layout { display: grid; grid-template-columns: var(--side-w) minmax(0, 1fr); min-height: 100vh; }

.side {
  border-right: 1px solid var(--rule);
  padding: 1.4rem 1rem 1.4rem 1.1rem;
  position: sticky; top: 0; height: 100vh; overflow-y: auto;
}
.brand { display: block; color: var(--ink); text-decoration: none; font-weight: bold; font-size: 1.1rem; line-height: 1.25; margin-bottom: 1.4rem; }
.brand small { display: block; font-weight: normal; font-size: .85rem; color: var(--slate); margin-top: .15rem; }
.brand:hover { color: var(--red); }

.side nav ul { list-style: none; margin: 0; padding: 0; }
.side nav a {
  display: flex; align-items: center; gap: .5rem;
  padding: .22rem 0 .22rem .55rem; border-left: 3px solid transparent;
  color: var(--blue); text-decoration: none;
}
.side nav a:hover { text-decoration: underline; }
.side nav a[aria-current="page"] { color: var(--ink); font-weight: bold; border-left-color: var(--red); }
.side nav a:focus-visible { outline: 1px dotted var(--ink); outline-offset: 1px; }
.side .group {
  margin: 1.2rem 0 .3rem .55rem; font-size: .78rem; font-weight: bold;
  letter-spacing: .05em; text-transform: uppercase;
}
.side .group.acoustics { color: var(--green); }
.side .group.electronics { color: var(--indigo); }
.side .end { margin-top: 1.2rem; padding-top: .7rem; border-top: 1px solid var(--rule); }

/* the "Menu" toggle only appears on narrow screens, and only with JavaScript */
.menu-toggle { display: none; }

main { padding: 2.2rem 2.5rem 4rem; }
.content { max-width: var(--measure); }

footer.foot { max-width: var(--measure); margin-top: 3rem; padding-top: .7rem; border-top: 1px solid var(--rule); color: var(--slate); font-size: .85rem; }
footer.foot a { color: var(--slate); }

/* ---------- text ---------- */
h1, h2, h3 { line-height: 1.25; margin: 1.8rem 0 .6rem; }
h1 { font-size: 1.75rem; margin-top: 0; }
h2 { font-size: 1.25rem; padding-bottom: .2rem; border-bottom: 1px solid var(--rule); }
h3 { font-size: 1.05rem; }
p, ul, ol, table { margin: 0 0 1rem; }
a { color: var(--blue); }
a:visited { color: var(--indigo); }
a:hover { color: var(--red); }
.lead { font-size: 1.05rem; color: var(--slate); margin-top: -.3rem; }
.muted { color: var(--slate); }
.hl { color: var(--red); font-weight: bold; }          /* highlight a word or phrase */
code, kbd { font: .9em Consolas, "Courier New", monospace; }
hr { border: 0; border-top: 1px solid var(--rule); margin: 2rem 0; }

table { border-collapse: collapse; width: 100%; font-size: .95rem; }
th, td { text-align: left; padding: .35rem .6rem .35rem 0; border-bottom: 1px solid var(--rule); vertical-align: top; }
th { font-weight: bold; border-bottom-color: var(--slate); }

/* a list of links, each with a short description (a section index) */
.index { list-style: none; padding: 0; }
.index li { display: flex; gap: .6rem; padding: .55rem 0; border-bottom: 1px dotted var(--rule); }
.index li .ic { margin-top: .2rem; }
.index a { font-weight: bold; }
.index .desc { display: block; color: var(--ink); }
.index .meta { display: block; color: var(--slate); font-size: .85rem; }

/* small status words, e.g. in the calculators list */
.status { font-size: .8rem; font-weight: bold; text-transform: uppercase; letter-spacing: .03em; }
.status.live { color: var(--green); }
.status.dev { color: var(--red); }

/* a note: thin crimson rule on the left */
.note { border-left: 3px solid var(--red); padding: .1rem 0 .1rem .8rem; color: var(--ink); }
.note b:first-child { color: var(--red); }

/* ---------- narrow screens: sidebar becomes a top menu ---------- */
@media (max-width: 760px) {
  .layout { grid-template-columns: 1fr; }
  .side { position: static; height: auto; border-right: 0; border-bottom: 1px solid var(--rule); padding: .8rem 1rem; }
  .side-head { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
  .brand { margin: 0; }
  .side nav { margin-top: .7rem; }
  /* Without JavaScript the menu stays open; with it, a "Menu" button folds it away. */
  .js .menu-toggle {
    display: inline-flex; align-items: center; gap: .4rem;
    font: inherit; font-size: .95rem; padding: .3rem .7rem;
    border: 1px solid var(--slate); background: var(--paper); color: var(--ink); cursor: pointer;
  }
  .js .side nav { display: none; }
  .js .side.open nav { display: block; }
  main { padding: 1.4rem 1rem 3rem; }
}

/* ---------- print (e.g. the CV) ---------- */
@media print {
  .side, .skip, footer.foot { display: none !important; }
  .layout { display: block; }
  main { padding: 0; }
  body { font-size: 11pt; }
  a, a:visited { color: #000; text-decoration: none; }
}