/* Edoardo Briganti — shared site stylesheet (index.html and research/index.html) */

:root {
  --bg: #0d0d0d;
  --fg: #e6e6e6;
  --fg-strong: #ffffff;
  --muted: #9a9a9a;
  --rule: #262626;
  --red: #ff3b3b;                          /* brand accent: site title, section bars, nav underline, focus ring */
  --link: #ff6b6b;                         /* text links and pills: lighter tint so ClearType draws full-weight glyphs on black (7:1) */
  --link-soft: rgba(255, 107, 107, 0.14);
  --link-border: rgba(255, 107, 107, 0.5);
}

/* Reset & base */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 2px; }
:focus-visible { outline: 2px solid var(--red); outline-offset: 2px; }
strong { color: var(--fg-strong); }

/* Layout */
.container { max-width: 960px; margin: 0 auto; padding-left: 1.25rem; padding-right: 1.25rem; }

/* Header & nav */
.site-header {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding-top: 1.1rem; padding-bottom: 1.1rem;
  border-bottom: 1px solid var(--rule);
}
.site-title a { font-size: 1.35rem; font-weight: 700; color: var(--red); letter-spacing: -0.01em; }
.site-title a:hover { text-decoration: none; }
nav ul { list-style: none; display: flex; flex-wrap: wrap; gap: 1.5rem; }
nav a { color: #c9c9c9; font-weight: 500; padding: 0.2rem 0; border-bottom: 2px solid transparent; }
nav a:hover { color: var(--fg-strong); text-decoration: none; }
nav a[aria-current="page"] { color: var(--fg-strong); border-bottom-color: var(--red); }

/* Section headings: short red bar underneath */
.section-title { font-size: 1.15rem; font-weight: 600; color: var(--fg-strong); margin-bottom: 1.25rem; }
.section-title::after { content: ""; display: block; width: 2.25rem; height: 2px; background: var(--red); margin-top: 0.5rem; border-radius: 1px; }

/* Pill buttons (PDF, Slides, Abstract, Show all) */
.btn {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.22rem 0.75rem;
  border: 1px solid var(--link-border); border-radius: 999px;
  background: transparent; color: var(--link);
  font: inherit; font-size: 0.82rem; font-weight: 500; line-height: 1.4;
  cursor: pointer; text-decoration: none;
  transition: background-color 0.15s, border-color 0.15s, color 0.15s;
}
.btn:hover, .btn[aria-expanded="true"] { background: var(--link-soft); border-color: var(--link); text-decoration: none; }
.btn i { font-size: 0.95em; }
.btn-muted { color: #c9c9c9; border-color: #3a3a3a; }
.btn-muted:hover { color: var(--fg-strong); border-color: #6a6a6a; background: rgba(255, 255, 255, 0.05); }

/* Home: profile + bio */
.splash { display: flex; flex-direction: column; align-items: center; gap: 2rem; padding-top: 2.5rem; padding-bottom: 1rem; }
@media (min-width: 768px) { .splash { flex-direction: row; align-items: flex-start; gap: 3rem; } }
.profile { display: flex; flex-direction: column; align-items: center; text-align: center; flex-shrink: 0; }
.profile-pic { width: 220px; height: 220px; border-radius: 50%; overflow: hidden; box-shadow: 0 0 0 1px var(--rule); }
.profile-pic img { display: block; width: 100%; height: 100%; object-fit: cover; object-position: center; }
.profile-details { margin-top: 1rem; }
.profile-details h1 { font-size: 1.25rem; font-weight: 600; color: var(--fg-strong); line-height: 1.3; }
.profile-details p { font-size: 0.95rem; color: var(--muted); margin-top: 0.15rem; }
.bio { max-width: 600px; }
.bio p + p { margin-top: 1.1rem; }
.bio .disclaimer { color: var(--muted); font-size: 0.85rem; font-style: italic; margin-top: 1.5rem; }
.bio .disclaimer strong { color: var(--muted); }

/* Home: talks and updates */
.updates { border-top: 1px solid var(--rule); margin-top: 1.5rem; padding-top: 2rem; padding-bottom: 0.5rem; }
.updates ul { list-style: none; }
.updates li { position: relative; padding-left: 1.25rem; margin-bottom: 0.6rem; }
.updates li::before { content: ""; position: absolute; left: 0; top: 0.72em; width: 6px; height: 6px; border-radius: 50%; background: #4a4a4a; }
.updates.collapsible:not(.expanded) li:nth-child(n+7) { display: none; }
#updates-toggle { margin-top: 1rem; }

/* Research: paper list */
.research { padding-top: 2.5rem; padding-bottom: 1rem; }
.paper-list { list-style: none; margin-bottom: 2.75rem; }
.paper-list > .paper { padding: 1.5rem 0; }
.paper-list > .paper:first-child { padding-top: 0; }
.paper-list > .paper + .paper { border-top: 1px solid var(--rule); }
.paper-title { font-size: 1.05rem; font-weight: 600; line-height: 1.45; color: var(--fg-strong); }
.paper-title .year { color: var(--muted); font-weight: 400; margin-left: 0.35rem; white-space: nowrap; }
.paper-authors { font-size: 0.95rem; margin-top: 0.25rem; }
.paper-note { font-size: 0.9rem; color: var(--muted); margin-top: 0.35rem; }
.paper-links { display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem; margin-top: 0.8rem; }
.status { font-size: 0.85rem; color: var(--muted); margin-left: 0.25rem; }
.abstract { margin-top: 0.9rem; padding-left: 1rem; border-left: 2px solid #333; color: #c9c9c9; font-size: 0.92rem; max-width: 72ch; }
.abstract[hidden] { display: none; }
.subpapers { list-style: none; margin-top: 1rem; padding-left: 1.25rem; border-left: 2px solid var(--rule); }
.subpapers .paper + .paper { margin-top: 1.1rem; }
.subpapers .paper-title { font-size: 0.98rem; font-weight: 500; }

/* Footer */
.site-footer { border-top: 1px solid var(--rule); margin-top: 2rem; padding-top: 1.5rem; padding-bottom: 2rem; display: flex; justify-content: center; }
.social-icons { list-style: none; display: flex; gap: 0.9rem; }
.social-icons a {
  display: inline-flex; align-items: center; justify-content: center;
  width: 2.4rem; height: 2.4rem; border-radius: 50%;
  border: 1px solid var(--rule); color: #c9c9c9; font-size: 1.15rem;
  transition: color 0.15s, border-color 0.15s;
}
.social-icons a:hover { color: var(--link); border-color: var(--link-border); text-decoration: none; }

/* Screen-reader only text */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); border: 0; }