/* ==========================================================================
   Stylesheet for the job-market website.
   Colours are set at the top; everything else uses them.
   The site follows the visitor's device: dark colours if the phone or computer
   is set to dark mode, light colours otherwise. The switch in the top bar is a
   checkbox (#theme): when it is ticked, the site shows the other mode.
   No JavaScript. (Each set of colours appears twice below; change both.)
   ========================================================================== */

/* ---------- Colours: dark (device in dark mode) ---------- */
:root {
  color-scheme: dark;
  --bg: #1e1f24;       /* intro block */
  --bg-alt: #25272d;   /* research blocks */
  --ink: #e3e3e6;      /* main text */
  --muted: #a2a5ad;    /* secondary text (coauthors) */
  --accent: #8ab4f8;   /* links */
  --line: #34363d;     /* thin lines */
}

/* ---------- Colours: light (dark device, switch ticked) ---------- */
:root:has(#theme:checked) {
  color-scheme: light;
  --bg: #ffffff;
  --bg-alt: #f7f7f7;
  --ink: #2b2b2b;
  --muted: #6b6b6b;
  --accent: #1565c0;
  --line: #e3e3e3;
}

@media (prefers-color-scheme: light) {
  /* ---------- Colours: light (device in light mode) ---------- */
  :root {
    color-scheme: light;
    --bg: #ffffff;
    --bg-alt: #f7f7f7;
    --ink: #2b2b2b;
    --muted: #6b6b6b;
    --accent: #1565c0;
    --line: #e3e3e3;
  }

  /* ---------- Colours: dark (light device, switch ticked) ---------- */
  :root:has(#theme:checked) {
    color-scheme: dark;
    --bg: #1e1f24;
    --bg-alt: #25272d;
    --ink: #e3e3e6;
    --muted: #a2a5ad;
    --accent: #8ab4f8;
    --line: #34363d;
  }
}

/* ---------- Fonts: stored in assets/fonts, no request to Google ----------
   Each file covers both weights (normal and bold). The "-ext" files hold
   extra letters such as ő and are only downloaded when a page needs them. */
@font-face {
  font-family: "Lora"; font-weight: 400 700; font-display: swap;
  src: url("assets/fonts/lora-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "Lora"; font-weight: 400 700; font-display: swap;
  src: url("assets/fonts/lora-latin-ext.woff2") format("woff2");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: "Roboto"; font-weight: 400 700; font-display: swap;
  src: url("assets/fonts/roboto-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "Roboto"; font-weight: 400 700; font-display: swap;
  src: url("assets/fonts/roboto-latin-ext.woff2") format("woff2");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

/* ---------- Basics ---------- */
* { box-sizing: border-box; }

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  margin: 0;
  background: var(--bg-alt);   /* matches the last block if the screen is taller than the page */
  color: var(--ink);
  font-family: "Roboto", system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 1rem;
  line-height: 1.7;
}

h1, h2, h3, .topbar a { font-family: "Lora", Georgia, serif; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, #theme:focus-visible + label, .abs-toggle:focus-visible ~ .meta .abs-btn { outline: 2px solid var(--accent); outline-offset: 3px; }

.wrap { max-width: 70rem; margin: 0 auto; padding: 0 1.5rem; }

/* Hidden on screen but still read aloud by screen readers */
.vh { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* "Skip to content" link, visible only when reached with the keyboard */
.skip { position: absolute; left: -999px; }
.skip:focus { left: 1rem; top: 1rem; z-index: 20; background: var(--bg); padding: .3rem .6rem; }

/* ---------- Top bar: Home, Research, CV and the theme switch ---------- */
.topbar {
  position: sticky; top: 0; z-index: 10;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
}
.bar { display: flex; align-items: center; min-height: 3.5rem; }
.topbar ul { list-style: none; margin: 0; padding: 0; display: flex; gap: 1.8rem; }
.topbar a { color: var(--ink); }
.topbar a:hover { color: var(--accent); text-decoration: none; }

.theme-slot { margin-left: auto; }
.toggle {
  display: grid; place-items: center;
  width: 2.2rem; height: 2.2rem; border-radius: 50%;
  color: var(--muted); cursor: pointer;
}
.toggle:hover { color: var(--ink); }
.toggle svg { width: 18px; height: 18px; }
/* Show the sun in dark mode (click for light), the moon in light mode */
.to-dark { display: none; }
:root:has(#theme:checked) .to-light { display: none; }
:root:has(#theme:checked) .to-dark { display: block; }
@media (prefers-color-scheme: light) {
  .to-light { display: none; }
  .to-dark { display: block; }
  :root:has(#theme:checked) .to-light { display: block; }
  :root:has(#theme:checked) .to-dark { display: none; }
}
/* Very old browsers can't run the switch: hide it there (the site still follows the device) */
@supports not selector(:has(a)) {
  .theme-slot { display: none; }
}

/* ---------- Blocks: full-width bands of colour ---------- */
.block { padding: 3.75rem 0; background: var(--bg); scroll-margin-top: 3.5rem; }
.block.alt { background: var(--bg-alt); }
/* Working Papers follows Job Market Paper in the same colour; a thin line separates them */
.block.alt + .block.alt { padding-top: 0; }
.block.alt + .block.alt .section-title { border-top: 1px solid var(--line); padding-top: 3rem; }

.section-title { font-size: 2.1rem; font-weight: 400; line-height: 1.2; margin: 0 0 2.2rem; }

/* Two columns used by every block: narrow on the left, wide on the right */
.grid { display: grid; grid-template-columns: 17rem 1fr; column-gap: 4rem; }

/* ---------- Intro: photo and name left, welcome text right ---------- */
.id { text-align: center; }
.photo {
  display: block;
  width: 220px; height: 220px; margin: 0 auto 1.2rem;
  border-radius: 50%; object-fit: cover;
}
h1 { font-size: 1.9rem; font-weight: 400; margin: 0; }

.welcome h2 { font-size: 1.6rem; font-weight: 400; margin: 0 0 1rem; }
.welcome p { margin: 0 0 1rem; max-width: 42rem; }
.welcome hr { max-width: 42rem; margin: 1.6rem 0; border: 0; border-top: 1px solid var(--line); }

/* ---------- Papers: title, coauthors, PDF left; abstract right ---------- */
.paper + .paper { margin-top: 2.8rem; }
.paper h3 { font-size: 1.2rem; font-weight: 700; line-height: 1.4; margin: 0 0 .5rem; }
.jmp h3 { font-size: 1.4rem; }
.meta p { margin: 0 0 .35rem; font-size: .92rem; color: var(--muted); }
.abstract { margin: 0; max-width: 44rem; }

/* Small outlined PDF buttons */
.tag {
  display: inline-block; margin-top: .5rem; padding: .15rem .6rem;
  border: 1px solid var(--accent); border-radius: 3px; font-size: .88rem;
}
/* Filled on mouse-over; only on devices with a mouse, so buttons don't stay filled after a tap */
@media (hover: hover) {
  .tag:hover { background: var(--accent); color: var(--bg); text-decoration: none; }
}

/* "Abstract" button for every paper, phones only (see the phone section below).
   Like the dark/light switch, it is a checkbox: ticked = abstract open. The box sits
   just before the title in index.html, so "~" (= "comes later in the same paper")
   can reach the abstract without newer CSS features. On computers
   it is hidden and every abstract shows. */
.abs-toggle, .abs-btn { display: none; }
.abs-btn { margin-left: .4rem; color: var(--accent); cursor: pointer; user-select: none; }
/* Small arrow drawn with two borders: points down when closed, up when open */
.arrow {
  display: inline-block; width: .38em; height: .38em; margin: 0 .1em .18em .45em;
  border-right: 1.5px solid; border-bottom: 1.5px solid; transform: rotate(45deg);
}

/* ---------- Phones: everything stacks ---------- */
@media (max-width: 760px) {
  .wrap { padding: 0 1.25rem; }
  .block { padding: 2.8rem 0; }
  .grid { grid-template-columns: 1fr; row-gap: 1rem; }
  .photo { width: 150px; height: 150px; }
  .id { margin-bottom: 1.2rem; }
  h1 { font-size: 1.6rem; }
  .section-title { font-size: 1.7rem; margin-bottom: 1.4rem; }
  .block.alt + .block.alt .section-title { padding-top: 2.2rem; }
  .jmp h3 { font-size: 1.25rem; }
}

/* Phones, on screen only (a printout always shows every abstract):
   abstracts stay closed until the "Abstract" button is tapped */
@media screen and (max-width: 760px) {
  .abs-toggle { display: block; }
  .abs-btn { display: inline-block; }
  .abs-toggle ~ .abstract { display: none; }
  .abs-toggle:checked ~ .abstract { display: block; }
  .abs-toggle:checked ~ .meta .arrow { transform: translateY(.2em) rotate(-135deg); }
}

/* ---------- Printing: always light colours, no top bar ---------- */
@media print {
  :root, :root:has(#theme:checked) {
    --bg: #fff; --bg-alt: #fff; --ink: #000; --muted: #444; --accent: #000; --line: #ccc;
  }
  .topbar { display: none; }
  .block { padding: 1.5rem 0; }
}