/* Course site for ASTRO/PHYS 545.
   Palette and type inherited from ../../assets/css/style.css so the
   subsite reads as part of djeong98.github.io, but the typography is
   set for long-form documents rather than for the landing pages. */
:root{
  --ink:#102c3b;
  --ink-deep:#0a202c;
  --ocean:#174d62;
  --teal:#1f6f78;
  --aqua:#7fc8bd;
  --coral:#f28a6e;
  --cream:#f4f1e9;
  --paper:#fbfaf6;
  --white:#ffffff;
  --line:rgba(16,44,59,.16);
  --muted:#62727a;
  --serif:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,serif;
  --sans:"Avenir Next",Avenir,"Helvetica Neue",Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:88px}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:var(--serif);font-size:18px;line-height:1.68;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--teal);text-decoration:none;border-bottom:1px solid rgba(31,111,120,.3)}
a:hover{color:var(--coral);border-bottom-color:var(--coral)}

.skip-link{position:absolute;left:-9999px}
.skip-link:focus{left:1rem;top:1rem;background:var(--white);padding:.5rem .9rem;z-index:20}

/* chrome */
.site-header{background:var(--ink);color:var(--cream);position:sticky;top:0;z-index:10}
.header-inner{max-width:1000px;margin:0 auto;padding:.95rem 1.5rem;
  display:flex;flex-wrap:wrap;align-items:center;gap:.5rem 1.6rem}
.brand{display:flex;align-items:center;gap:.6rem;color:var(--white);border:0;
  font-family:var(--sans)}
.brand-mark{width:22px;height:22px;position:relative;flex:none}
.brand-orbit{position:absolute;inset:0;border:1px solid var(--aqua);border-radius:50%;
  opacity:.75;transform:rotate(-18deg) scaleY(.55)}
.brand-core{position:absolute;left:50%;top:50%;width:7px;height:7px;margin:-3.5px 0 0 -3.5px;
  background:var(--aqua);border-radius:50%}
.brand strong{display:block;font-size:.98rem;font-weight:600;letter-spacing:.005em}
.brand small{display:block;font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--aqua);margin-top:.12rem}
.site-nav{margin-left:auto;display:flex;flex-wrap:wrap;gap:1.1rem;
  font-family:var(--sans);font-size:.84rem;letter-spacing:.02em}
.site-nav a{color:rgba(244,241,233,.72);border:0;padding-bottom:3px}
.site-nav a:hover{color:var(--white)}
.site-nav a.here{color:var(--white);box-shadow:inset 0 -2px 0 var(--aqua)}
.site-nav a.up{color:var(--aqua)}

main{max-width:800px;margin:0 auto;padding:3.2rem 1.5rem 5rem}

h1,h2,h3,h4{font-family:var(--sans);color:var(--ink);line-height:1.22;font-weight:600}
h1{font-size:2.15rem;margin:0 0 .35rem;letter-spacing:-.018em}
h1+h3{font-family:var(--serif);font-weight:400;font-style:italic;color:var(--muted);
  font-size:1.14rem;line-height:1.45;margin:0 0 2.4rem}
h2{font-size:1.32rem;margin:3rem 0 .9rem;padding-top:1.5rem;border-top:1px solid var(--line)}
h3{font-size:1.04rem;margin:2rem 0 .55rem;color:var(--ocean)}
h4{font-size:.94rem;margin:1.5rem 0 .4rem;color:var(--ocean)}
p,ul,ol{margin:0 0 1.05rem}
ul,ol{padding-left:1.35rem}
li{margin-bottom:.34rem}
strong{color:var(--ink-deep);font-weight:600}
em{font-style:italic}
hr{border:0;border-top:1px solid var(--line);margin:2.6rem 0}

blockquote{margin:1.7rem 0;padding:.95rem 1.45rem;background:var(--cream);
  border-left:3px solid var(--aqua);color:var(--ocean);font-style:italic;border-radius:0 4px 4px 0}
blockquote p{margin:0}

table{width:100%;border-collapse:collapse;margin:1.5rem 0;
  font-family:var(--sans);font-size:.87rem;line-height:1.55}
th{text-align:left;background:var(--cream);color:var(--ink);font-weight:600;
  padding:.6rem .75rem;border-bottom:2px solid var(--line)}
td{padding:.6rem .75rem;border-bottom:1px solid var(--line);vertical-align:top}
tr:last-child td{border-bottom:0}

code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.87em;
  background:var(--cream);padding:.12em .38em;border-radius:3px}

.factbox{background:var(--white);border:1px solid var(--line);border-radius:8px;
  padding:1.25rem 1.45rem;margin:1.9rem 0;font-family:var(--sans);font-size:.92rem;
  line-height:1.6;box-shadow:0 10px 30px rgba(5,29,39,.05)}
.factbox p{margin:0 0 .5rem}
.factbox p:last-child{margin:0}
.factbox strong{display:inline-block;min-width:9.5rem;color:var(--muted);
  font-weight:600;font-size:.78rem;letter-spacing:.09em;text-transform:uppercase}

.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(215px,1fr));
  gap:1rem;margin:2rem 0}
.card{background:var(--white);border:1px solid var(--line);border-radius:8px;
  padding:1.15rem 1.25rem;font-family:var(--sans)}
.card a{border:0;font-weight:600;font-size:1rem;color:var(--ocean)}
.card a:hover{color:var(--coral)}
.card p{margin:.35rem 0 0;font-size:.85rem;color:var(--muted);line-height:1.5}

footer{border-top:1px solid var(--line);background:var(--cream)}
.footer-inner{max-width:800px;margin:0 auto;padding:2.1rem 1.5rem;
  font-family:var(--sans);font-size:.82rem;line-height:1.7;color:var(--muted)}
.footer-inner a{color:var(--ocean)}

@media(max-width:640px){
  body{font-size:17px}
  main{padding:2.2rem 1.2rem 3.5rem}
  h1{font-size:1.75rem}
  h2{font-size:1.18rem}
  .site-nav{width:100%;margin-left:0;gap:.85rem;font-size:.8rem}
  .factbox strong{display:block;min-width:0}
  table{font-size:.79rem}
}