/* Econ PhD Handbook: a sidebar of contents, serif text, quiet sans-serif headings. */

:root {
  --text: #1c1c1a;
  --muted: #5f5e5a;
  --faint: #8c8b85; /* 3.4:1 on white: list bullets and rules only, never text */
  --background: #ffffff;
  --sidebar: #f7f7f4;
  --rule: #e4e3de;
  --link: #1d4f91;
  --accent: #8a6a00; /* UNSW gold, deep enough to reach 4.7:1 on the sidebar */

  --serif: "Source Serif 4", Charter, "Bitstream Charter", "Sitka Text", Cambria, Georgia, serif;
  --sans: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --sidebar-width: 17rem;

  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #e8e6e1;
    --muted: #a9a79f;
    --faint: #7c7a74;
    --background: #161615;
    --sidebar: #1e1e1c;
    --rule: #33332f;
    --link: #8fb6ec;
    --accent: #e6c200;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family: var(--serif);
  font-size: 1.0625rem;
  line-height: 1.65;
}

a {
  color: var(--link);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
}

a:hover {
  text-decoration-thickness: 2px;
}

a:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--link);
  outline-offset: 2px;
  border-radius: 2px;
}

.skip-link {
  position: absolute;
  left: -100vw;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
  z-index: 1;
  padding: 0.5rem 1rem;
  background: var(--background);
}

.print-only {
  display: none;
}

/* Layout: fixed-width sidebar, content column beside it. */

.layout {
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  background: var(--sidebar);
  border-right: 1px solid var(--rule);
  font-family: var(--sans);
  font-size: 0.875rem;
  line-height: 1.45;
}

.sidebar-inner {
  position: sticky;
  top: 0;
  max-height: 100vh;
  overflow-y: auto;
  padding: 1.75rem 1.25rem 2rem;
}

.site-title {
  display: block;
  color: var(--text);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.3;
  text-decoration: none;
}

.site-title span {
  display: block;
  margin-top: 0.15rem;
  color: var(--muted);
  font-size: 0.8125rem;
  font-weight: 400;
}

.toc summary {
  display: none;
}

.toc ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.toc nav > ul {
  margin-top: 1.75rem;
}

.toc nav > ul > li {
  margin-bottom: 1.1rem;
}

.toc a {
  color: var(--muted);
  text-decoration: none;
}

.toc a:hover {
  color: var(--text);
  text-decoration: underline;
}

.toc nav > ul > li > a {
  color: var(--text);
  font-weight: 600;
}

.toc li li a {
  display: block;
  margin-top: 0.1rem;
  padding: 0.2rem 0 0.2rem 0.75rem;
  border-left: 3px solid transparent;
}

.toc a[aria-current="page"] {
  color: var(--text);
  font-weight: 600;
}

.toc li li a[aria-current="page"] {
  border-left-color: var(--accent);
}

.toc nav > ul > li > a[aria-current="page"] {
  box-shadow: inset 0 -2px var(--accent);
}

main {
  padding: 3rem clamp(1.25rem, 5vw, 4.5rem) 3rem;
}

.content {
  max-width: 42rem;
}

/* Text */

h1,
h2,
h3,
h4 {
  font-family: var(--sans);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

h1 {
  margin: 0 0 1.75rem;
  font-size: 2rem;
}

h2 {
  margin: 2.75rem 0 0.75rem;
  font-size: 1.3rem;
}

h3 {
  margin: 2rem 0 0.5rem;
  font-size: 1.05rem;
}

h4 {
  margin: 1.5rem 0 0.5rem;
  font-size: 1rem;
}

h2 a {
  color: inherit;
  text-decoration: none;
}

h2 a:hover {
  text-decoration: underline;
}

p {
  margin: 0 0 1rem;
}

ul,
ol {
  margin: 0 0 1.25rem;
  padding-left: 1.4rem;
}

li {
  margin: 0.3rem 0;
}

li > ul,
li > ol {
  margin: 0.3rem 0 0.5rem;
}

li::marker {
  color: var(--faint);
}

ol > li::marker {
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.9em;
}

strong {
  font-weight: 600;
}

code,
pre {
  font-family: var(--mono);
  font-size: 0.875rem;
}

pre {
  margin: 0 0 1.25rem;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  background: var(--sidebar);
  border: 1px solid var(--rule);
  border-radius: 4px;
  line-height: 1.55;
  white-space: pre-wrap; /* templates are meant to be read and copied, so wrap long lines */
}

.eyebrow {
  margin: 0 0 0.4rem;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.8125rem;
}

.eyebrow a {
  color: inherit;
}

.reviewed {
  margin: -1.25rem 0 1.75rem;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.8125rem;
}

.lede {
  margin: -1rem 0 2rem;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.9375rem;
}

.on-this-page {
  margin: 0 0 2.25rem;
  padding: 0.9rem 1.15rem;
  background: var(--sidebar);
  border-radius: 4px;
  font-family: var(--sans);
  font-size: 0.875rem;
  line-height: 1.45;
}

.on-this-page p {
  margin: 0 0 0.35rem;
  color: var(--muted);
  font-weight: 600;
}

.on-this-page ul {
  margin: 0;
  padding-left: 1.1rem;
}

.on-this-page li {
  margin: 0.2rem 0;
}

.page-list {
  padding-left: 1.1rem;
}

/* Tables: sans-serif with aligned figures; wide ones scroll inside their own box. */

.table-scroll {
  margin: 0.5rem 0 2rem;
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--sans);
  font-size: 0.875rem;
  font-variant-numeric: tabular-nums;
  line-height: 1.45;
}

th,
td {
  padding: 0.5rem 0.75rem 0.5rem 0;
  border-bottom: 1px solid var(--rule);
  text-align: left;
  vertical-align: top;
}

th {
  border-bottom-color: var(--faint);
  color: var(--muted);
  font-size: 0.8125rem;
  font-weight: 600;
}

.site-footer {
  margin-top: 4rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.8125rem;
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  color: inherit;
}

/* Phones and narrow windows: the sidebar becomes a header with a folding menu. */

@media (max-width: 56rem) {
  .layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--rule);
  }

  .sidebar-inner {
    position: static;
    max-height: none;
    padding: 1rem 1.25rem 0.5rem;
  }

  .toc summary {
    display: list-item;
    margin-top: 0.25rem;
    padding-block: 0.6rem;
    color: var(--text);
    cursor: pointer;
    font-weight: 600;
  }

  .toc nav > ul {
    margin-top: 0.5rem;
  }

  .toc nav > ul > li > a,
  .toc li li a {
    display: block;
    padding-block: 0.6rem;
  }

  .toc nav > ul > li {
    margin-bottom: 0.5rem;
  }

  main {
    padding-top: 2rem;
  }

  h1 {
    font-size: 1.65rem;
  }
}

/* Printing: black on white, full width, headings kept with what follows. */

@media print {
  :root {
    --text: #000000;
    --muted: #333333;
    --faint: #666666;
    --background: #ffffff;
    --sidebar: #ffffff;
    --rule: #bbbbbb;
    --link: #000000;
  }

  @page {
    margin: 18mm;
  }

  body {
    font-size: 11pt;
    line-height: 1.45;
  }

  .sidebar,
  .skip-link,
  .on-this-page,
  .screen-only {
    display: none;
  }

  .print-only {
    display: block;
  }

  .layout {
    display: block;
  }

  main {
    padding: 0;
  }

  .content {
    max-width: none;
  }

  h1,
  h2,
  h3 {
    break-after: avoid;
  }

  tr,
  pre {
    break-inside: avoid;
  }

  thead {
    display: table-header-group;
  }

  .table-scroll {
    overflow: visible;
  }

  .site-footer {
    margin-top: 2rem;
  }
}