/* ==========================================================================
   Dipartimento di Astrofisica — foglio di stile
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,400;0,9..144,500;0,9..144,600;1,9..144,400&family=Inter:wght@400;500;600&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root{
  --bg: #0a0e1c;
  --bg-panel: #10152b;
  --bg-panel-2: #151b38;
  --text: #e8ebf6;
  --text-muted: #98a1c4;
  --text-faint: #5c6489;
  --line: rgba(232, 235, 246, 0.13);
  --line-strong: rgba(232, 235, 246, 0.24);

  --gold: #e7a339;
  --gold-dim: #a97a34;
  --cyan: #5cd3cf;
  --violet: #8f80e6;
  --crimson: #dd6672;
  --amber: #e08a3c;

  --serif: 'Fraunces', Georgia, 'Times New Roman', serif;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  --content-width: 1180px;
  --measure: 62ch;
}

*, *::before, *::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }

body{
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *, *::before, *::after{ animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

a{ color: inherit; }
img, svg{ max-width: 100%; display: block; }

.wrap{
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 32px;
}

/* ---------- Focus visibility ---------- */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible{
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- Header ---------- */
.site-header{
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 14, 28, 0.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.site-header .wrap{
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand{
  display: flex;
  align-items: baseline;
  gap: 10px;
  text-decoration: none;
  font-family: var(--serif);
  font-size: 1.15rem;
  letter-spacing: 0.01em;
}
.brand .brand-mark{
  color: var(--gold);
  font-style: italic;
}
.brand small{
  display: block;
  font-family: var(--sans);
  font-size: 0.68rem;
  color: var(--text-faint);
  font-weight: 500;
  margin-top: 2px;
}

.main-nav{
  display: flex;
  gap: 30px;
}
.main-nav a{
  text-decoration: none;
  font-size: 0.92rem;
  color: var(--text-muted);
  padding: 6px 0;
  border-bottom: 1px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.main-nav a:hover{
  color: var(--text);
  border-color: var(--line-strong);
}

.nav-toggle{
  display: none;
  background: none;
  border: 1px solid var(--line-strong);
  color: var(--text);
  border-radius: 6px;
  width: 40px;
  height: 40px;
  font-size: 1.1rem;
}

/* ---------- Hero ---------- */
.hero{
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

#starfield{
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.hero .wrap{
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
  padding-top: 96px;
  padding-bottom: 96px;
  min-height: 560px;
}

.hero-eyebrow{
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--cyan);
  margin: 0 0 18px;
}

.hero h1{
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(2.3rem, 4.2vw, 3.6rem);
  line-height: 1.08;
  margin: 0 0 22px;
  letter-spacing: -0.01em;
}

.hero p.lede{
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 46ch;
  margin: 0 0 34px;
}

.cta-row{
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 22px;
  border-radius: 3px;
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
.btn-primary{
  background: var(--gold);
  color: #1a1204;
}
.btn-primary:hover{
  background: #f2b654;
}
.btn-secondary{
  border: 1px solid var(--line-strong);
  color: var(--text);
}
.btn-secondary:hover{
  border-color: var(--cyan);
  color: var(--cyan);
}

.hero-diagram{
  position: relative;
  aspect-ratio: 1 / 1;
}

/* ---------- Section shells ---------- */
section{
  padding: 96px 0;
  border-bottom: 1px solid var(--line);
}
section:last-of-type{ border-bottom: none; }

.section-head{
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 40px;
  margin-bottom: 56px;
}

.section-head .index{
  font-family: var(--mono);
  color: var(--text-faint);
  font-size: 0.85rem;
  padding-top: 6px;
}

.section-head h2{
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(1.7rem, 2.6vw, 2.3rem);
  margin: 0 0 14px;
  max-width: 18ch;
}

.section-head .desc{
  color: var(--text-muted);
  max-width: var(--measure);
  margin: 0;
}

/* ---------- Ricerca ---------- */
.research-list{
  display: flex;
  flex-direction: column;
}

.research-item{
  display: grid;
  grid-template-columns: 260px 1fr auto;
  gap: 40px;
  align-items: start;
  padding: 28px 0;
  border-top: 1px solid var(--line);
}
.research-item:last-child{ border-bottom: 1px solid var(--line); }

.band-tag{
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  padding-top: 4px;
}
.band-dot{
  width: 9px;
  height: 9px;
  border-radius: 50%;
  flex-shrink: 0;
}

.research-item h3{
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.25rem;
  margin: 0 0 8px;
}
.research-item p{
  color: var(--text-muted);
  margin: 0;
  max-width: 58ch;
}

.research-item .lead-name{
  font-size: 0.85rem;
  color: var(--text-faint);
  align-self: center;
  text-align: right;
  white-space: nowrap;
}

/* ---------- Numeri / marginalia ---------- */
.figures{
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 40px;
}
.figures .prose{
  color: var(--text-muted);
  max-width: var(--measure);
}
.figures .prose p{ margin: 0 0 18px; }
.figures .prose strong{ color: var(--text); font-weight: 600; }

.margin-notes{
  display: flex;
  flex-direction: column;
  gap: 26px;
}
.margin-note{
  border-left: 2px solid var(--gold-dim);
  padding-left: 16px;
}
.margin-note .num{
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.9rem;
  color: var(--gold);
  line-height: 1;
  display: block;
}
.margin-note .label{
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ---------- Persone ---------- */
.people-grid{
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.person-card{
  background: var(--bg);
  padding: 28px 24px;
}
.avatar{
  width: 52px;
  height: 52px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.1rem;
  color: #10152b;
  margin-bottom: 18px;
}
.person-card h3{
  font-family: var(--sans);
  font-weight: 600;
  font-size: 1rem;
  margin: 0 0 4px;
}
.person-card .role{
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 0 0 14px;
}
.person-card .area{
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--text-faint);
}

/* ---------- Pubblicazioni ---------- */
.pub-list{
  border-top: 1px solid var(--line);
}
.pub-item{
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 32px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}
.pub-item .year{
  font-family: var(--mono);
  color: var(--cyan);
  font-size: 0.95rem;
  padding-top: 2px;
}
.pub-item h3{
  font-family: var(--sans);
  font-weight: 600;
  font-size: 1.02rem;
  margin: 0 0 6px;
  line-height: 1.4;
}
.pub-item .meta{
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-faint);
}
.pub-item .authors{
  color: var(--text-muted);
  font-size: 0.92rem;
  margin: 0 0 8px;
}

/* ---------- Seminari ---------- */
.seminar-list{
  display: flex;
  flex-direction: column;
  gap: 0;
}
.seminar-item{
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 32px;
  padding: 24px 0;
  border-top: 1px solid var(--line);
}
.seminar-item:last-child{ border-bottom: 1px solid var(--line); }
.seminar-date{
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--text-muted);
}
.seminar-item h3{
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.1rem;
  margin: 0 0 6px;
}
.seminar-item p{
  color: var(--text-muted);
  margin: 0;
  font-size: 0.95rem;
}

/* ---------- Contatti / footer ---------- */
.contact-section{
  padding-bottom: 64px;
}
.contact-grid{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}
.contact-grid h2{
  font-family: var(--serif);
  font-weight: 500;
  font-size: 2rem;
  margin: 0 0 20px;
  max-width: 14ch;
}
.contact-details{
  color: var(--text-muted);
}
.contact-details dt{
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-faint);
  margin-top: 18px;
}
.contact-details dd{
  margin: 4px 0 0;
  font-size: 1rem;
  color: var(--text);
}
.contact-details dd a{ text-decoration: underline; text-decoration-color: var(--line-strong); text-underline-offset: 3px; }
.contact-details dd a:hover{ text-decoration-color: var(--cyan); color: var(--cyan); }

footer{
  border-top: 1px solid var(--line);
  padding: 28px 0;
}
footer .wrap{
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-faint);
  font-size: 0.82rem;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px){
  .main-nav{
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--bg-panel);
    border-bottom: 1px solid var(--line);
    padding: 8px 20px 16px;
  }
  .main-nav.is-open{ display: flex; }
  .main-nav a{ padding: 12px 0; border-bottom: 1px solid var(--line); }
  .nav-toggle{ display: block; }

  .hero .wrap{
    grid-template-columns: 1fr;
    padding-top: 56px;
    padding-bottom: 56px;
  }
  .hero-diagram{ order: -1; max-width: 260px; margin: 0 auto; }

  .section-head{ grid-template-columns: 1fr; gap: 12px; }
  .figures{ grid-template-columns: 1fr; }
  .research-item{ grid-template-columns: 1fr; gap: 10px; }
  .research-item .lead-name{ text-align: left; }
  .people-grid{ grid-template-columns: repeat(2, 1fr); }
  .pub-item{ grid-template-columns: 1fr; gap: 6px; }
  .seminar-item{ grid-template-columns: 1fr; gap: 6px; }
  .contact-grid{ grid-template-columns: 1fr; gap: 32px; }
  .wrap{ padding: 0 20px; }
}

@media (max-width: 520px){
  .people-grid{ grid-template-columns: 1fr; }
}