/* ============================================================
   styles.css — Stile istituzionale CyberSalerno Summit
   Modifica le variabili in :root per personalizzare i colori.
   ============================================================ */

/* ── Variabili colore ──────────────────────────────────────── */
:root {
  --blu-unisa:       #1a3a6e;   /* blu principale UNISA */
  --blu-scuro:       #0f2347;   /* hover, footer */
  --blu-chiaro:      #2a5298;   /* links, accenti secondari */
  --oro:             #c8a12a;   /* accento dorato istituzionale */
  --oro-chiaro:      #e6c454;   /* hover oro */
  --bianco:          #ffffff;
  --grigio-sfondo:   #f4f6f9;   /* sfondo pagina */
  --grigio-bordo:    #dde2eb;   /* separatori, bordi */
  --grigio-testo:    #555f6e;   /* testo secondario */
  --testo:           #1c2333;   /* testo principale */
  --rosso-errore:    #c0392b;

  /* Badge tipi talk */
  --badge-keynote:   #1a3a6e;
  --badge-talk:      #2a5298;
  --badge-panel:     #6c3483;
  --badge-workshop:  #1a6e4a;
  --badge-ceremony:  #7f8c8d;
  --badge-break:     #aab7c4;

  --radius:  6px;
  --shadow:  0 2px 8px rgba(0,0,0,0.08);
  --shadow-hover: 0 4px 16px rgba(0,0,0,0.14);
  --max-width: 1100px;
  --font: 'Georgia', 'Times New Roman', serif;
  --font-ui: system-ui, -apple-system, 'Segoe UI', sans-serif;
}

/* ── Reset base ────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-ui);
  font-size: 16px;
  line-height: 1.65;
  color: var(--testo);
  background: var(--grigio-sfondo);
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--blu-chiaro); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible { outline: 3px solid var(--oro); outline-offset: 2px; border-radius: 2px; }

h1, h2, h3, h4 {
  font-family: var(--font);
  line-height: 1.25;
  color: var(--blu-unisa);
}

/* ── Utilità ───────────────────────────────────────────────── */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 1.5rem; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }
.text-center { text-align: center; }

/* ── Topbar istituzionale ──────────────────────────────────── */
.topbar {
  background: var(--blu-scuro);
  color: rgba(255,255,255,0.75);
  font-size: 0.78rem;
  padding: 0.45rem 0;
  letter-spacing: 0.01em;
}
.topbar .container { display: flex; align-items: center; gap: 0.5rem; }
.topbar a { color: rgba(255,255,255,0.85); }
.topbar a:hover { color: var(--oro-chiaro); text-decoration: none; }
.topbar-sep { opacity: 0.4; margin: 0 0.25rem; }

/* ── Header principale ─────────────────────────────────────── */
.site-header {
  background: var(--blu-unisa);
  color: var(--bianco);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 10px rgba(0,0,0,0.25);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.header-logo {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  text-decoration: none;
  color: var(--bianco);
  flex-shrink: 0;
}
.header-logo-img {
  flex-shrink: 0;
  height: 88px;
  width: auto;
  max-width: 240px;
  object-fit: contain;
}
.header-logo-dip {
  border-left: 1px solid rgba(255,255,255,0.25);
  padding-left: 0.75rem;
  margin-left: 0.25rem;
}
@media (max-width: 640px) {
  .header-logo-dip { display: none; }
  .header-logo-img { height: 60px; max-width: 160px; }
}
.logo-text { line-height: 1.2; }
.logo-text strong {
  display: block;
  font-size: 1rem;
  font-family: var(--font);
  letter-spacing: 0.01em;
}
.logo-text span { font-size: 0.72rem; opacity: 0.8; }

.header-center { flex: 1; text-align: center; }
.header-event-name {
  font-family: var(--font);
  font-size: 1.1rem;
  font-weight: bold;
  letter-spacing: 0.02em;
  opacity: 0.9;
}

.header-actions { display: flex; align-items: center; gap: 0.75rem; }

/* Selettore anno */
.edition-selector-wrap { display: flex; align-items: center; gap: 0.5rem; font-size: 0.85rem; }
.edition-selector-wrap label { opacity: 0.8; white-space: nowrap; }
#edition-select {
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.35);
  color: var(--bianco);
  padding: 0.35rem 0.7rem;
  border-radius: var(--radius);
  font-size: 0.85rem;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='white' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.6rem center;
  padding-right: 2rem;
}
#edition-select:focus { outline: 2px solid var(--oro); outline-offset: 2px; }
#edition-select option { background: var(--blu-scuro); color: var(--bianco); }

/* Badge "Corrente" */
.badge-current {
  background: var(--oro);
  color: var(--blu-scuro);
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.2rem 0.55rem;
  border-radius: 20px;
}

/* ── Sezione HERO ──────────────────────────────────────────── */
.hero {
  background: linear-gradient(135deg, var(--blu-unisa) 0%, var(--blu-chiaro) 100%);
  color: var(--bianco);
  padding: 4rem 0 3.5rem;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='60' height='60'%3E%3Ccircle cx='30' cy='30' r='1.5' fill='rgba(255,255,255,0.06)'/%3E%3C/svg%3E");
  pointer-events: none;
}
.hero-badge {
  display: inline-block;
  background: var(--oro);
  color: var(--blu-scuro);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 0.3rem 0.9rem;
  border-radius: 20px;
  margin-bottom: 1.2rem;
}
.hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  color: var(--bianco);
  margin-bottom: 0.7rem;
  line-height: 1.15;
}
.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  opacity: 0.88;
  margin-bottom: 1.8rem;
  max-width: 680px;
}
.hero-subtitle a {
  color: #ffffff;
  text-decoration: underline;
}
.hero-title-sub {
  display: block;
  font-size: clamp(0.95rem, 1.8vw, 1.15rem);
  font-weight: 400;
  opacity: 0.82;
  margin-top: 0.15rem;
  margin-bottom: 0.6rem;
  letter-spacing: 0.03em;
}

.header-event-name { line-height: 1.3; }
.header-event-sub {
  display: block;
  font-size: 0.72rem;
  font-weight: 400;
  opacity: 0.75;
  letter-spacing: 0.04em;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-bottom: 2rem;
  font-size: 0.95rem;
  opacity: 0.9;
}
.hero-meta-item { display: flex; align-items: center; gap: 0.4rem; }
.hero-meta-item .icon { font-size: 1.1rem; opacity: 0.7; }

.hero-text {
  max-width: 680px;
  opacity: 0.85;
  line-height: 1.7;
  margin-bottom: 2.2rem;
  font-size: 1.02rem;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 1rem; align-items: center; }
.registration-box {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1rem;
}
.registration-label {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  opacity: 0.6;
  color: #fff;
  white-space: nowrap;
}
.registration-btns { display: flex; flex-wrap: wrap; gap: 0.6rem; }

/* Bottoni */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.7rem 1.6rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: 2px solid transparent;
  text-decoration: none;
  transition: background 0.18s, color 0.18s, border-color 0.18s, box-shadow 0.18s;
  line-height: 1.2;
}
.btn-primary {
  background: var(--oro);
  color: var(--blu-scuro);
  border-color: var(--oro);
}
.btn-primary:hover {
  background: var(--oro-chiaro);
  border-color: var(--oro-chiaro);
  text-decoration: none;
  box-shadow: 0 4px 12px rgba(200,161,42,0.4);
}
.btn-outline {
  background: transparent;
  color: var(--bianco);
  border-color: rgba(255,255,255,0.5);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.1);
  border-color: var(--bianco);
  text-decoration: none;
}
.btn-sm { padding: 0.45rem 1rem; font-size: 0.85rem; }

/* ── Sezioni generali ──────────────────────────────────────── */
.section {
  padding: 4rem 0;
}
.section-alt { background: var(--bianco); }
.section-title {
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  color: var(--blu-unisa);
  margin-bottom: 0.4rem;
}
.section-underline {
  width: 48px;
  height: 4px;
  background: var(--oro);
  border-radius: 2px;
  margin-bottom: 2rem;
}
.section-subtitle {
  color: var(--grigio-testo);
  margin-bottom: 2rem;
  font-size: 1rem;
}

.section-coming-soon {
  color: var(--grigio-testo);
  font-size: 1.1rem;
  font-style: italic;
  text-align: center;
  padding: 2.5rem 0;
}

/* ── About / descrizione ───────────────────────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 3rem;
  align-items: start;
}
.about-description { font-size: 1.02rem; line-height: 1.75; color: var(--testo); }
.about-description + .about-description { margin-top: 1rem; }

.about-box {
  background: var(--grigio-sfondo);
  border: 1px solid var(--grigio-bordo);
  border-left: 4px solid var(--oro);
  border-radius: var(--radius);
  padding: 1.5rem;
}
.about-box h3 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--blu-unisa);
  margin-bottom: 0.9rem;
}
.about-box ul { list-style: none; }
.about-box li {
  padding: 0.3rem 0;
  border-bottom: 1px solid var(--grigio-bordo);
  font-size: 0.9rem;
  color: var(--grigio-testo);
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}
.about-box li:last-child { border-bottom: none; }
.about-box li::before { content: '›'; color: var(--oro); font-weight: bold; flex-shrink: 0; }

/* ── Programma ─────────────────────────────────────────────── */
.program-days { display: flex; gap: 0.5rem; margin-bottom: 2rem; flex-wrap: wrap; }
.day-btn {
  padding: 0.5rem 1.2rem;
  border: 2px solid var(--grigio-bordo);
  border-radius: 30px;
  background: var(--bianco);
  color: var(--grigio-testo);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  transition: all 0.18s;
  font-family: var(--font-ui);
}
.day-btn:hover { border-color: var(--blu-chiaro); color: var(--blu-chiaro); }
.day-btn.active {
  background: var(--blu-unisa);
  border-color: var(--blu-unisa);
  color: var(--bianco);
}

.program-list { display: flex; flex-direction: column; gap: 0; }

.talk-item {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 1.2rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--grigio-bordo);
  align-items: start;
}
.talk-item:last-child { border-bottom: none; }
.talk-item.type-break { opacity: 0.55; }
.talk-item.type-break .talk-title { font-style: italic; font-weight: normal; }

.talk-time {
  font-size: 0.88rem;
  color: var(--grigio-testo);
  font-weight: 600;
  padding-top: 0.15rem;
  white-space: nowrap;
}
.talk-time .end-time { font-weight: 400; opacity: 0.7; }

.talk-body {}
.talk-header { display: flex; align-items: flex-start; gap: 0.75rem; flex-wrap: wrap; margin-bottom: 0.3rem; }

.talk-badge {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  padding: 0.15rem 0.55rem;
  border-radius: 3px;
  color: var(--bianco);
  white-space: nowrap;
  flex-shrink: 0;
  margin-top: 0.2rem;
}
.badge-type-keynote  { background: var(--badge-keynote); }
.badge-type-talk     { background: var(--badge-talk); }
.badge-type-panel    { background: var(--badge-panel); }
.badge-type-workshop { background: var(--badge-workshop); }
.badge-type-ceremony { background: var(--badge-ceremony); }
.badge-type-break    { background: var(--badge-break); color: var(--testo); }

.talk-title { font-size: 1.02rem; font-weight: 700; color: var(--testo); line-height: 1.3; }
.talk-title.has-abstract {
  cursor: help;
  position: relative;
}
.talk-title.has-abstract::after {
  content: attr(data-abstract);
  display: none;
  position: absolute;
  left: 0;
  top: calc(100% + 8px);
  width: 380px;
  max-width: 90vw;
  background: #1e2a3a;
  color: #e8edf3;
  font-size: 0.85rem;
  font-weight: 400;
  line-height: 1.55;
  padding: 0.75rem 1rem;
  border-radius: 6px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.25);
  z-index: 100;
  white-space: normal;
}
.talk-title.has-abstract:hover::after { display: block; }
.talk-speaker {
  font-size: 0.9rem;
  color: var(--grigio-testo);
  margin-top: 0.2rem;
}
.talk-speaker strong { color: var(--blu-chiaro); }
.talk-description {
  font-size: 0.88rem;
  color: var(--grigio-testo);
  margin-top: 0.5rem;
  line-height: 1.55;
  border-left: 3px solid var(--grigio-bordo);
  padding-left: 0.8rem;
}

/* ── Relatori / Partner ────────────────────────────────────── */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.5rem;
}
.card {
  background: var(--bianco);
  border: 1px solid var(--grigio-bordo);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  transition: box-shadow 0.18s, transform 0.18s;
}
.card:hover { box-shadow: var(--shadow-hover); transform: translateY(-2px); }
.card-icon { font-size: 1.8rem; margin-bottom: 0.8rem; }
.organizer-logo { height: 56px; width: auto; object-fit: contain; margin-bottom: 1rem; }
.card h3 { font-size: 1rem; margin-bottom: 0.3rem; color: var(--blu-unisa); }
.card .card-role { font-size: 0.82rem; color: var(--grigio-testo); margin-bottom: 0.5rem; }
.card a { font-size: 0.82rem; }

.partners-list {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
}
.partner-chip {
  background: var(--bianco);
  border: 1px solid var(--grigio-bordo);
  border-radius: 30px;
  padding: 0.55rem 1.2rem;
  font-size: 0.88rem;
  color: var(--grigio-testo);
  box-shadow: var(--shadow);
}

/* ── Sezione info pratiche ─────────────────────────────────── */
.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}
.info-card {
  background: var(--bianco);
  border: 1px solid var(--grigio-bordo);
  border-top: 4px solid var(--blu-unisa);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}
.info-card h3 {
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--blu-unisa);
  margin-bottom: 0.8rem;
}
.info-card p, .info-card address {
  font-size: 0.92rem;
  color: var(--grigio-testo);
  line-height: 1.6;
  font-style: normal;
}
.info-card a { color: var(--blu-chiaro); }

/* ── Notice storica (anni precedenti) ─────────────────────── */
.archive-notice {
  background: #fffbee;
  border: 1px solid #e5d68a;
  border-left: 4px solid var(--oro);
  border-radius: var(--radius);
  padding: 0.9rem 1.2rem;
  font-size: 0.88rem;
  color: #5a4d0a;
  margin-bottom: 2.5rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

/* ── Footer ────────────────────────────────────────────────── */
.site-footer {
  background: var(--blu-scuro);
  color: rgba(255,255,255,0.7);
  padding: 3rem 0 1.5rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}
.footer-col h4 {
  color: var(--bianco);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  padding-bottom: 0.5rem;
}
.footer-col p, .footer-col address {
  font-size: 0.85rem;
  line-height: 1.7;
  font-style: normal;
}
.footer-col a { color: rgba(255,255,255,0.7); }
.footer-col a:hover { color: var(--oro-chiaro); text-decoration: none; }
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 0.4rem; font-size: 0.85rem; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 1.2rem;
  font-size: 0.78rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.footer-bottom a { color: rgba(255,255,255,0.5); }

/* ── Loading state ─────────────────────────────────────────── */
.loading-placeholder {
  text-align: center;
  padding: 3rem;
  color: var(--grigio-testo);
  font-size: 0.95rem;
}

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 900px) {
  .about-grid { grid-template-columns: 1fr; gap: 2rem; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid > :first-child { grid-column: 1 / -1; }
  .talk-item { grid-template-columns: 75px 1fr; gap: 1rem; }
}

@media (max-width: 640px) {
  .hero { padding: 2.5rem 0 2rem; }
  .section { padding: 2.5rem 0; }
  .header-inner { gap: 0.75rem; }
  .header-center { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
  .talk-item { grid-template-columns: 1fr; gap: 0.4rem; }
  .talk-time { padding-top: 0; font-size: 0.82rem; }
  .topbar .container { font-size: 0.72rem; }
}

@media print {
  .site-header, .topbar, .hero-actions, .program-days, .edition-selector-wrap { display: none; }
  .hero { padding: 1rem 0; }
  .talk-item.type-break { display: none; }
}