/* ============================================================
   Shared stylesheet for yuvalamit2.github.io and the notes page.
   Lives in the homepage repo and is loaded by both:
     homepage    <link rel="stylesheet" href="style.css">
     notes page  <link rel="stylesheet" href="https://yuvalamit2.github.io/style.css">
   ============================================================ */

/* ------------------------------------------------------------------
   OPTIONAL: exact mathpazo font on every platform.
   Download TeX Gyre Pagella from https://www.gust.org.pl/projects/e-foundry/tex-gyre/pagella
   convert the .otf files to .woff2, put them in a fonts/ folder in this
   repo, then uncomment the three blocks below.

@font-face {
  font-family: "TeX Gyre Pagella";
  src: url("fonts/texgyrepagella-regular.woff2") format("woff2");
  font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "TeX Gyre Pagella";
  src: url("fonts/texgyrepagella-italic.woff2") format("woff2");
  font-weight: 400; font-style: italic; font-display: swap;
}
@font-face {
  font-family: "TeX Gyre Pagella";
  src: url("fonts/texgyrepagella-bold.woff2") format("woff2");
  font-weight: 700; font-style: normal; font-display: swap;
}
------------------------------------------------------------------ */

/* ---------- palette and type ---------- */

:root {
  --bg:         #ffffff;
  --text:       #111111;
  --muted:      #3c3c3c;   /* secondary text -- deliberately dark, not grey */
  --rule:       #d6d6d6;
  --heading:    #123a63;   /* dark blue, for section headers */
  --link:       #1a66cc;
  --link-hover: #0f4ea8;

  /* mathpazo is Palatino; this stack finds the real thing nearly everywhere */
  --serif: "TeX Gyre Pagella", "Palatino Linotype", "Book Antiqua", Palatino,
           "URW Palladio L", "P052", "Palatino LT STD", Georgia, serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 4rem 1.25rem 6rem;
  background: var(--bg);
  color: var(--text);
  font-family: var(--serif);
  font-size: 1.08rem;
  line-height: 1.7;
  -webkit-text-size-adjust: 100%;
}

main { max-width: 48rem; margin: 0 auto; }

/* ---------- header ---------- */

h1 {
  margin: 0 0 .4rem;
  font-size: 2.6rem;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 1.08rem;
}

/* consecutive subtitle lines: a new line, not a new paragraph.
   0 = normal line spacing; raise it to push the lines apart. */
.subtitle + .subtitle { margin-top: 0; }

/* .line = a block-level line with no paragraph gap.
   Use instead of <br> or an empty <p> when you want stacked lines. */
.line {
  display: block;
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.6;
}

.line + .line { margin-top: .1rem; }

.meta {
  margin: 1rem 0 0;
  font-size: 1.05rem;
  line-height: 1.6;
}

header {
  padding-bottom: 2.25rem;
  border-bottom: 1px solid var(--rule);
}

/* back-link at the top of a subpage */
.backlink {
  display: block;
  margin: 0 0 1.75rem;
  font-size: 1rem;
}

/* ---------- sections ---------- */

section {
  padding-top: 2.75rem;
  margin-top: 2.75rem;
  border-top: 1px solid var(--rule);
}

section:first-of-type { border-top: none; margin-top: 0; }

h2 {
  margin: 0 0 1rem;
  font-family: var(--serif);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.005em;
  color: var(--heading);
}

h3 {
  margin: 2rem 0 .75rem;
  font-family: var(--serif);
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--heading);
}

p { margin: 0 0 1rem; }
p:last-child { margin-bottom: 0; }

a {
  color: var(--link);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2.5px;
}

a:hover, a:focus { color: var(--link-hover); }

/* ---------- lists ---------- */

ul.links,
ul.friends,
ul.papers,
ul.courses {
  list-style: none;
  margin: 0;
  padding: 0;
}

ul.links li   { margin-bottom: 1.25rem; }
ul.papers li  { margin-bottom: 1.75rem; }
ul.courses li { margin-bottom: 1.5rem; }
ul.friends li { margin-bottom: .4rem; }

ul.links li:last-child,
ul.papers li:last-child,
ul.courses li:last-child,
ul.friends li:last-child { margin-bottom: 0; }

.desc,
.authors,
.blurb {
  display: block;
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.6;
}

.blurb { margin-top: .2rem; }
.blurb + .line { margin-top: .45rem; }

/* ---------- footer ---------- */

footer {
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 1rem;
}

/* ---------- under construction ---------- */

.construction {
  margin-top: 3.5rem;
  padding: 1.6rem 1.75rem;
  background: var(--bg);
  border: 1px solid var(--rule);
  font-size: 1.02rem;
}

.construction h2 {
  margin-bottom: .75rem;
  font-size: 1.25rem;
}

.letter {
  margin: 1.1rem 0 0;
  color: var(--muted);
  font-style: italic;
}

.letter p { margin-bottom: .45rem; }

/* ---------- small screens ---------- */

@media (max-width: 34rem) {
  body { padding: 2.5rem 1.1rem 4rem; font-size: 1.05rem; }
  h1 { font-size: 2.1rem; }
  h2 { font-size: 1.35rem; }
  h3 { font-size: 1.12rem; }
  section { padding-top: 2.25rem; margin-top: 2.25rem; }
}