/* Antonio Villani — antoniovillani.eu
   One stylesheet. No frameworks, no external requests, no JavaScript. */

:root {
  --ink:        #1a1a1a;
  --ink-soft:   #4a4a4a;
  --ink-faint:  #6e6e6e;
  --accent:     #1f4e79;
  --accent-dk:  #163a59;
  --rule:       #e2e2e2;
  --bg:         #ffffff;
  --bg-soft:    #f7f7f5;
  --pill:       #eef2f6;
  --measure:    46rem;
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-dk); text-decoration: underline; }

/* ---------- Skip link (accessibility) ---------- */
.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--accent); color: #fff; padding: .6rem 1rem; z-index: 100;
}
.skip-link:focus { left: 0; }

/* ---------- Nav ---------- */
.site-nav {
  border-bottom: 1px solid var(--rule);
  background: rgba(255,255,255,.95);
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: saturate(180%) blur(8px);
}
.nav-inner {
  max-width: var(--measure); margin: 0 auto; padding: .85rem 1.25rem;
  display: flex; align-items: baseline; justify-content: space-between;
  flex-wrap: wrap; gap: .4rem 1rem;
}
.nav-name {
  font-weight: 600; letter-spacing: .01em; color: var(--ink);
  font-size: 1.02rem; white-space: nowrap;
}
.nav-name a { color: inherit; }
.nav-name a:hover { text-decoration: none; color: var(--accent); }
.nav-links { display: flex; gap: 1.15rem; flex-wrap: wrap; }
.nav-links a {
  color: var(--ink-soft); font-size: .95rem;
  padding-bottom: 2px; border-bottom: 2px solid transparent;
}
.nav-links a:hover { color: var(--accent); text-decoration: none; }
.nav-links a.active { color: var(--ink); border-bottom-color: var(--accent); font-weight: 500; }

/* ---------- Layout ---------- */
.container { max-width: var(--measure); margin: 0 auto; padding: 2.6rem 1.25rem 4rem; }

h1 {
  font-size: 2.05rem; line-height: 1.18; margin: 0 0 .35rem;
  letter-spacing: -.015em; font-weight: 650;
}
h2 {
  font-size: 1.18rem; margin: 2.9rem 0 1.1rem; letter-spacing: .02em;
  text-transform: uppercase; color: var(--ink-soft); font-weight: 600;
  padding-bottom: .45rem; border-bottom: 1px solid var(--rule);
}
h3 { font-size: 1.04rem; margin: 1.9rem 0 .5rem; font-weight: 600; }
p { margin: 0 0 1.05rem; }

/* ---------- Header block ---------- */
.header-section {
  display: grid; grid-template-columns: 190px 1fr; gap: 2rem; align-items: start;
  margin-bottom: .8rem;
}
.profile-photo {
  width: 100%; height: auto; border-radius: 3px; display: block;
  border: 1px solid var(--rule);
}
.role { font-size: 1.02rem; color: var(--ink-soft); margin: 0 0 .3rem; }
.fields {
  font-size: .93rem; color: var(--ink-faint); margin: 0 0 .5rem;
  letter-spacing: .015em;
}
.market-flag {
  display: inline-block; font-size: .82rem; font-weight: 600;
  letter-spacing: .045em; text-transform: uppercase;
  color: var(--accent); background: var(--pill);
  padding: .22rem .6rem; border-radius: 3px; margin-bottom: 1.15rem;
}
.intro-text { margin-bottom: 1rem; }
.header-content > p:last-child { margin-bottom: 0; }

/* ---------- Papers ---------- */
.paper { padding: 1.35rem 0; border-bottom: 1px solid var(--rule); }
.paper:last-child { border-bottom: 0; }
.paper-head {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 1rem; flex-wrap: wrap;
}
.paper-title { font-size: 1.06rem; font-weight: 600; margin: 0; line-height: 1.4; flex: 1 1 20rem; }
.paper-meta { font-size: .88rem; color: var(--ink-faint); margin: .3rem 0 .7rem; }
.paper-coauthor { font-weight: 400; color: var(--ink-soft); }

.paper-action-btn {
  display: inline-block; font-size: .84rem; font-weight: 550;
  padding: .3rem .75rem; border: 1px solid var(--accent); border-radius: 3px;
  color: var(--accent); background: #fff; white-space: nowrap;
}
.paper-action-btn:hover { background: var(--accent); color: #fff; text-decoration: none; }
.paper-action-btn.muted {
  border-color: var(--rule); color: var(--ink-faint); cursor: default; background: var(--bg-soft);
}

/* Native <details> disclosure — no JavaScript anywhere on this site. */
.paper-toggle { margin-top: .2rem; }
.paper-toggle > summary {
  list-style: none; cursor: pointer; display: inline-flex; align-items: center;
  gap: .38rem; font-size: .84rem; font-weight: 550; letter-spacing: .02em;
  color: var(--accent); background: var(--pill);
  padding: .3rem .7rem; border-radius: 3px; user-select: none;
}
.paper-toggle > summary::-webkit-details-marker { display: none; }
.paper-toggle > summary::marker { content: ""; }
.paper-toggle > summary:hover { background: #e3eaf2; }
.paper-toggle > summary::after {
  content: "▸"; font-size: .72rem; transition: transform .15s ease; display: inline-block;
}
.paper-toggle[open] > summary::after { transform: rotate(90deg); }
.paper-abstract {
  margin: .85rem 0 .2rem; font-size: .955rem; color: var(--ink-soft);
  text-align: justify; hyphens: auto;
}
/* Research page shows abstracts permanently expanded. */
.abstract-static {
  margin: .7rem 0 0; font-size: .955rem; color: var(--ink-soft);
  text-align: justify; hyphens: auto;
}

/* ---------- Placeholders (must be impossible to miss) ---------- */
.placeholder {
  border-left: 3px solid #c9922e; background: #fdf7ea;
  padding: .8rem 1rem; margin: .9rem 0; font-size: .92rem; color: #6b5320;
}
.placeholder strong { color: #8a6516; letter-spacing: .04em; }

/* ---------- Definition-style lists (CV, teaching, contact) ---------- */
.entry { margin: 0 0 1.4rem; }
.entry-head {
  display: flex; justify-content: space-between; gap: 1rem;
  flex-wrap: wrap; align-items: baseline;
}
.entry-title { font-weight: 600; }
.entry-date { color: var(--ink-faint); font-size: .9rem; white-space: nowrap; }
.entry-detail { color: var(--ink-soft); font-size: .95rem; margin: .15rem 0 0; }

.contact-list { list-style: none; padding: 0; margin: 0; }
.contact-list li { margin-bottom: .8rem; }
.contact-label {
  display: block; font-size: .8rem; text-transform: uppercase;
  letter-spacing: .05em; color: var(--ink-faint); margin-bottom: .1rem;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--rule); margin-top: 3.2rem; padding-top: 1.4rem;
  font-size: .92rem; color: var(--ink-faint);
}
.site-footer a { color: var(--accent); }
.footer-links { display: flex; gap: 1.1rem; flex-wrap: wrap; margin-bottom: .6rem; }

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
  body { font-size: 16.5px; }
  .container { padding: 2rem 1.1rem 3rem; }
  .header-section { grid-template-columns: 1fr; gap: 1.3rem; justify-items: center; text-align: center; }
  .profile-photo { max-width: 190px; }
  .header-content { text-align: left; }
  h1 { font-size: 1.8rem; text-align: center; }
  .role, .fields { text-align: center; }
  .market-flag { display: block; width: fit-content; margin-inline: auto; }
  .nav-inner { justify-content: center; }
  .paper-abstract, .abstract-static { text-align: left; }
}

@media print {
  .site-nav, .paper-action-btn { display: none; }
  .paper-toggle > summary { display: none; }
  .paper-abstract { display: block !important; }
  a { color: inherit; text-decoration: none; }
}

/* ==========================================================================
   CV document page (cv.html)
   Reads as a standalone document rather than a site page: its own toolbar
   instead of the site nav, tighter section rules, right-aligned year column.
   ========================================================================== */

.cv-toolbar {
  border-bottom: 1px solid var(--rule);
  background: rgba(255,255,255,.95);
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: saturate(180%) blur(8px);
}
.cv-toolbar-inner {
  max-width: var(--measure); margin: 0 auto; padding: .8rem 1.25rem;
  display: flex; align-items: center; justify-content: space-between;
  gap: .6rem 1rem; flex-wrap: wrap;
}
.cv-toolbar-links { display: flex; gap: 1.1rem; flex-wrap: wrap; font-size: .95rem; }
.cv-toolbar-links a { color: var(--ink-soft); }
.cv-toolbar-links a:hover { color: var(--accent); text-decoration: none; }

.btn-pdf {
  display: inline-block; font-size: .86rem; font-weight: 600; letter-spacing: .015em;
  padding: .4rem .95rem; border-radius: 3px; white-space: nowrap;
  background: var(--accent); color: #fff; border: 1px solid var(--accent);
}
.btn-pdf:hover { background: var(--accent-dk); border-color: var(--accent-dk); color: #fff; text-decoration: none; }

.cv-name {
  font-size: 1.95rem; font-weight: 650; letter-spacing: -.015em;
  margin: 0 0 .9rem; line-height: 1.15;
}
.cv-contact {
  display: flex; justify-content: space-between; gap: 1rem 2rem; flex-wrap: wrap;
  font-size: .93rem; color: var(--ink-soft); line-height: 1.55;
  padding-bottom: 1.1rem; border-bottom: 2px solid var(--ink);
}

.cv-section { margin-top: 1.9rem; }
.cv-section-title {
  font-size: .82rem; font-weight: 700; letter-spacing: .09em; text-transform: uppercase;
  color: var(--ink); margin: 0 0 .7rem; padding-bottom: .3rem;
  border-bottom: 1px solid var(--rule);
}
.cv-subsection-title {
  font-size: .88rem; font-weight: 600; color: var(--ink-soft);
  margin: 1rem 0 .35rem; font-style: italic;
}

.cv-entries { width: 100%; border-collapse: collapse; }
.cv-entries td { vertical-align: top; padding: .3rem 0; font-size: .95rem; }
.cv-entries td.desc { padding-right: 1.2rem; }
.cv-entries td.year {
  text-align: right; white-space: nowrap; color: var(--ink-faint);
  font-size: .89rem; width: 1%; font-variant-numeric: tabular-nums;
}
.cv-entries td.yr {
  white-space: nowrap; color: var(--ink-faint); font-size: .89rem;
  width: 1%; padding-right: 1.1rem; font-variant-numeric: tabular-nums;
}
.cv-detail { display: block; color: var(--ink-faint); font-size: .88rem; margin-top: .1rem; }
.cv-list { margin: .2rem 0 0; padding-left: 1.15rem; font-size: .95rem; }
.cv-list li { margin-bottom: .3rem; }
.cv-list li::marker { color: var(--ink-faint); }
.cv-plain { font-size: .95rem; margin: 0; }
.cv-updated {
  margin-top: 2.4rem; padding-top: 1rem; border-top: 1px solid var(--rule);
  font-size: .86rem; color: var(--ink-faint);
}

@media (max-width: 720px) {
  .cv-name { font-size: 1.65rem; }
  .cv-contact { flex-direction: column; gap: .5rem; }
  /* Stack each row so a long description never crushes the year. */
  .cv-entries, .cv-entries tbody, .cv-entries tr, .cv-entries td { display: block; width: auto; }
  .cv-entries tr { padding: .45rem 0; }
  .cv-entries td { padding: 0; }
  .cv-entries td.year { text-align: left; margin-top: .1rem; }
  .cv-entries td.yr { margin-bottom: .1rem; font-weight: 600; }
}

@media print {
  .cv-toolbar { display: none; }
  .cv-section { break-inside: avoid; page-break-inside: avoid; }
  .cv-contact { border-bottom-color: #000; }
  .container { padding-top: 0; }
}