/* ============================================
   Outpump-inspired refresh (Francesco)
   - Neutral black/white palette
   - Uppercase, condensed nav
   - Editorial grid + bold headlines
   - Subtle hairline dividers
   ============================================ */

/* ---------- Design tokens ---------- */
:root {
  --bg: #fff;
  --text: #111;
  --muted: #4EF525; /* gray-500 */
  --border: #4EF525; /* gray-200 */
  --accent: #111;
  --container: 1240px;
  --radius: 12px;
}

/* ---------- Reset & base ---------- */
* { box-sizing: border-box; }
html { width: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; height: auto; display: block; }

.container { max-width: var(--container); margin-inline: auto; padding-inline: 16px; }

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
  letter-spacing: -0.02em;
  color: var(--text);
  margin: 0 0 .5em 0;
  line-height: 1.2;
}
h1 { font-weight: 800; font-size: clamp(28px, 4vw, 44px); }
h2 { font-weight: 800; font-size: clamp(22px, 3vw, 32px); }
h3 { font-weight: 700; font-size: clamp(18px, 2.2vw, 24px); }
h4 { font-weight: 700; font-size: 16px; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); }

p { margin: 0 0 1em; }

/* Links */
a { color: var(--text); text-decoration: none; outline: none; transition: opacity .2s ease, color .2s ease, border-color .2s ease, transform .2s; border: 0; }
a:hover { opacity: .75; text-decoration: underline; text-underline-offset: 3px; }
a:focus-visible { outline: 2px solid var(--text); outline-offset: 2px; }
a:visited { color: var(--text); }

/* Tables & lists */
ul, ol { padding-left: 1.2rem; }
li { margin-bottom: .5rem; }
table { border-collapse: collapse; width: 100%; }
td, th { padding: 8px 0; border-bottom: 1px solid var(--border); font-size: 14px; }

/* ---------- Layout ---------- */
/* Turn old left .sidebar into a top navbar */
.sidebar {
  margin: 0; padding: 12px 16px; width: 100%; height: auto;
  position: sticky; top: 0; z-index: 40;
  background: var(--muted);
  border-bottom: 1px solid var(--border);
  display: flex; gap: 24px; align-items: center; overflow-x: auto;
}
.sidebar a {
  display: inline-block; color: var(--text); padding: 8px 0;
  font-weight: 700; text-transform: uppercase; letter-spacing: .06em; font-size: 12px;
}
.sidebar a.active { background: transparent; color: var(--text); border-bottom: 2px solid var(--text); }
.sidebar a:hover:not(.active) { background: transparent; color: var(--text); opacity: .7; }

/* Main content container */
div.content { margin: 24px auto 80px; padding: 0 16px; max-width: var(--container); height: auto; }

/* Optional utility nav bar (if you keep .nav) */
.nav {
  display: flex; justify-content: space-between; align-items: center;
  background: var(--bg); color: var(--text);
  padding: 12px 16px; border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 50;
}
.nav a { color: var(--text); text-decoration: none; border: 0; text-transform: uppercase; font-weight: 700; letter-spacing: .06em; }
.nav a:hover { text-decoration: underline; }

/* ---------- Editorial grid & cards ---------- */
.grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 24px; }
.card { grid-column: span 4; display: flex; flex-direction: column; gap: 12px; }
.card--xl { grid-column: span 12; }
.card--lg { grid-column: span 8; }
.card--md { grid-column: span 6; }

.card__media { position: relative; overflow: hidden; border-radius: var(--radius); }
.card__media img { width: 100%; aspect-ratio: 16/9; object-fit: cover; transform: translateZ(0); transition: transform .3s ease; }
.card:hover .card__media img { transform: scale(1.03); }

.card__kicker { font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); }
.card__title { font-size: clamp(18px, 2.4vw, 28px); font-weight: 800; line-height: 1.25; }
.card__meta { font-size: 12px; color: var(--muted); }

/* ---------- Components ---------- */
/* Hairline divider */
.hr { height: 1px; background: var(--border); border: 0; margin: 24px 0; }
.muted { color: var(--muted); }

/* Tooltip restyle (x1/x2) */
.x1 { position: relative; display: inline-block; border-bottom: 0; }
.x1 .x2 {
  visibility: hidden; opacity: 0; z-index: 10;
  position: absolute; left: 50%; transform: translateX(-50%);
  top: calc(100% + 8px);
  background: #111; color: #fff; border-radius: 8px;
  padding: 12px 14px; min-width: 260px; max-width: 80vw;
  box-shadow: 0 8px 24px rgba(0,0,0,.15);
  transition: opacity .2s ease, visibility .2s ease;
}
.x1:hover .x2 { visibility: visible; opacity: 1; }

/* Social icons: neutral black like Outpump */
.linkedin-icon, .google-scholar, .x-social, .orcid, .researcher, .university { color: var(--text); }

/* Code blocks */
pre, code, .codice, .codice2 { font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace; }
.codice, .codice2 { font-size: 14px; white-space: pre-wrap; font-weight: 500; }
.codice2 { background: #f5f5f5; border: 1px solid var(--border); padding: 16px; margin-left: 0; border-radius: 8px; }

/* Toggle sections */
.content0 { display: none; }
.content0.active { display: block; }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .card { grid-column: span 6; }
  .card--lg { grid-column: span 12; }
}
@media (max-width: 640px) {
  .sidebar { gap: 16px; padding: 10px 12px; }
  .sidebar a { font-size: 11px; }
  div.content { padding: 0 12px; }
  .grid { gap: 16px; }
  .card { grid-column: span 12; }
  h1 { font-size: clamp(24px, 8vw, 36px); }
}

/* ---------- Legacy cleanups from old file ---------- */
body.chatting { margin: 0; } /* Remove huge margins */
/* Drop the colored backgrounds and borders on links */
.sidebar a, .nav a, a, a:hover, a:visited { border: 0; }
/* Normalize table text size */
td { font-size: 14px; }

/* Accessible focus */
:focus-visible { outline: 2px solid #111; outline-offset: 2px; }