/* Base */

:root{
  --kta-primary: #0055A4;
  --kta-secondary: #2C3E50;
  --kta-accent: #F7C843;
  --kta-bg: #ECEFF1;
  --kta-white: #FFFFFF;
}

body {
  margin: 0;
  font-family: 'Segoe UI', Arial, sans-serif;
  background: var(--kta-bg);
  color: #222;
}

a{ color: var(--kta-primary); }
a:hover{ color: var(--kta-accent); }


/* Header & Nav */
header {
  background: linear-gradient(90deg, #2C3E50 0%, #0055A4 50%, #0055A4 100%);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 40px;
}

header img {
  height: 64px;
}

nav a {
  color:#fff;
  text-decoration: none;
  margin:0;
  padding:8px 10px;
  border-radius:8px;
  font-weight: 500;
  transition: color 0.2s;
}

header nav{
  display:flex;
  gap:14px;                   /* sostituisce margin sugli <a> */
  flex-wrap:wrap;
}

nav a:hover {
  color: #F7C843;
  background: rgba(247,200,67,.12);
}

/* Hero */
.hero {
  background: url('../../img/cogenerazione2.jpg') center/cover no-repeat;
  color: #fff;
  padding: 100px 0 80px 0;
  text-align: center;
  position: relative;
}

.hero::after {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 85, 164, 0.55);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
}

.hero h1 {
  font-size: 2.8rem;
  margin-bottom: 16px;
}

.hero p {
  font-size: 1.3rem;
  margin-bottom: 32px;
}

.hero .cta, .hero .btn {
  background: #F7C843;
  color: #0055A4;
  padding: 14px 32px;
  border: none;
  border-radius: 4px;
  font-size: 1.1rem;
  font-weight: bold;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s;
}

.hero .cta, .hero .btn:hover {
  background: #F7C843;
}

/* Sezioni */
.section {
  max-width: 1100px;
  margin: 40px auto;
  padding: 0 20px;
}

.section-title {
  color: #0055A4;
  font-size: 2rem;
  margin-bottom: 20px;
  text-align: center;
}

/* Servizi */
.services {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: center;
}

.service-box {
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.07);
  padding: 28px 20px;
  flex: 1 1 220px;
  max-width: 260px;
  text-align: center;
}

.service-box h3,
.service-box p {
  color: #222;
}

.service-box img {
  height: 48px;
  margin-bottom: 12px;
}

/* Certificazioni */
.certifications {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  margin-top: 20px;
}

.certifications img {
  height: 48px;
}

/* News */
.news-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 20px;
}

.news-item {
  background: #fff;
  border-radius: 6px;
  padding: 16px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.05);
}

/* Contatti */
.contact-section {
  background: #0055A4;
  color: #fff;
  padding: 32px 0;
  text-align: center;
}

.contact-section a {
  color: #F7C843;
  text-decoration: underline;
}

/* Footer */
footer {
  background: #2C3E50;
  color: #fff;
  text-align: center;
  padding: 18px 0;
  font-size: 0.95rem;
  margin-top: 40px;
}

/* Responsive */
@media (max-width: 900px) {
  .services {
    flex-direction: column;
    align-items: center;
  }
  .certifications {
    flex-direction: column;
    gap: 16px;
  }
}

/* Header moderno: sticky, ombra, container */
.site-header{
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(0, 85, 164, 0.92);
  backdrop-filter: blur(8px);
  box-shadow: 0 6px 18px rgba(0,0,0,.12);
}

.header-inner{
  max-width: 1100px;
  margin: 0 auto;
  padding: 12px 20px;
  display:flex;
  align-items:center;
  justify-content: space-between;
  gap: 16px;
}

.brand img{ height: 44px; display:block; }

/* Menu desktop */
.site-nav{
  display:flex;
  align-items:center;
  gap: 14px;
  flex-wrap: wrap;
}

.site-nav a{
  color:#fff;
  text-decoration:none;
  font-weight: 600;
  padding: 8px 10px;
  border-radius: 10px;
  transition: background .2s, color .2s, transform .2s;
}

.site-nav a:hover{
  color:#F7C843;
  background: rgba(247,200,67,.14);
  transform: translateY(-1px);
}

.site-nav a:focus-visible{
  outline: 2px solid #F7C843;
  outline-offset: 2px;
}

/* Bottone hamburger */
.nav-toggle{
  display:none;
  background: transparent;
  border: 1px solid rgba(255,255,255,.35);
  color:#fff;
  border-radius: 10px;
  padding: 8px 10px;
  cursor:pointer;
}

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

/* Mobile menu */
@media (max-width: 900px){
  .nav-toggle{ display:inline-flex; align-items:center; gap:8px; }

  .site-nav{
    display:none;                 /* nascosto di default */
    position:absolute;
    left:0; right:0;
    top: 100%;
    background:#0055A4;
    padding: 12px 20px 16px;
    flex-direction: column;
    align-items: flex-start;
    box-shadow: 0 10px 24px rgba(0,0,0,.18);
  }

  .site-header.is-open .site-nav{ display:flex; }
}

/* ==========================
   Case study (hub + detail)
   ========================== */

/* Hub /case/Case_Study.html */
.case-hub .filters{
  display:flex;
  gap:12px;
  flex-wrap:wrap;
  margin: 16px 0 20px;
}
.case-hub label{ display:flex; align-items:center; gap:10px; font-weight:600; color:#0b1221; }
.case-hub select{
  padding:8px 10px;
  border:1px solid #d0d7de;
  border-radius:8px;
  background:#fff;
}
.case-hub .grid{
  display:grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap:16px;
  margin-top:16px;
}
.case-hub .card{
  background:#fff;
  border:1px solid #e5e7eb;
  border-radius:12px;
  overflow:hidden;
  display:flex;
  flex-direction:column;
  box-shadow: 0 1px 2px rgba(0,0,0,.05);
}
.case-hub .card img{
  width:100%;
  display:block;
  aspect-ratio:16/9;
  object-fit:cover;
}
.case-hub .card .body{ padding:14px 16px 16px; }
.case-hub .badge{
  display:inline-block;
  background:rgba(0, 85, 164, 0.08);
  color:#0055A4;
  font-weight:700;
  font-size:.78rem;
  padding:3px 8px;
  border-radius:999px;
  margin-right:6px;
}
.case-hub .kpi{
  display:flex;
  gap:10px;
  flex-wrap:wrap;
  color:#0055A4;
  font-weight:700;
  font-size:.95rem;
  list-style:none;
  padding:0;
  margin:8px 0 0;
}
.case-hub a{ color:inherit; text-decoration:none; }
.case-hub a:hover{ text-decoration:underline; }

/* Detail pages /case/*.html */
.case-article{ max-width: 920px; margin: 0 auto; }
.case-back{ margin: 0 0 10px; }
.case-back a{ font-weight:700; }
.case-article h1{ margin: 10px 0 14px; font-size: 2.1rem; line-height:1.18; color:#0b1221; }
.case-article h2{ margin: 22px 0 10px; font-size: 1.35rem; color:#0055A4; }
.case-article p{ line-height: 1.65; }
.case-article ul{ padding-left: 18px; line-height: 1.65; }
.case-article li{ margin: 6px 0; }
.case-article a{ color:#0055A4; }
.case-article a:hover{ text-decoration:underline; }

@media (max-width: 600px){
  .case-article h1{ font-size: 1.7rem; }
}


/* ==========================
   Buttons (V2.1)
   ========================== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 18px;border-radius:12px;font-weight:800;text-decoration:none;border:1px solid transparent;cursor:pointer;transition:transform .18s ease,filter .18s ease,background .18s ease,color .18s ease,border-color .18s ease;will-change:transform}
.btn:hover{transform:translateY(-1px);filter:brightness(1.04)}
.btn:active{transform:translateY(0);filter:brightness(.99)}
.btn:focus-visible{outline:3px solid var(--kta-accent);outline-offset:2px}
.btn--primary{background:var(--kta-primary);color:var(--kta-white)}
.btn--primary:hover{filter:brightness(1.06)}
.btn--accent{background:var(--kta-accent);color:var(--kta-secondary)}
.btn--ghost{background:transparent;color:var(--kta-primary);border-color:rgba(0,85,164,.25)}
.btn--ghost:hover{background:rgba(0,85,164,.06)}
.contact-form button{width:fit-content;margin-top:10px;background:var(--kta-primary);color:var(--kta-white);border:none;padding:12px 18px;border-radius:12px;font-weight:800;cursor:pointer;transition:transform .18s ease,filter .18s ease}
.contact-form button:hover{transform:translateY(-1px);filter:brightness(1.06)}
.contact-form button:focus-visible{outline:3px solid var(--kta-accent);outline-offset:2px}


/* ==========================
   Header buttons (V2.2)
   ========================== */
.site-header .site-nav a.btn{
  padding: 8px 12px;
  border-radius: 999px;
  font-weight: 800;
  line-height: 1;
}
/* In header, render primary buttons as subtle pills to avoid a full blue-on-blue */
.site-header .site-nav a.btn--primary{
  background: rgba(255,255,255,.12);
  border-color: rgba(255,255,255,.22);
  color: var(--kta-white);
}
.site-header .site-nav a.btn--primary:hover{
  background: rgba(247,200,67,.18);
  border-color: rgba(247,200,67,.55);
  color: var(--kta-white);
  filter: none;
}
.site-header .site-nav a.btn--primary:focus-visible{
  outline-color: var(--kta-accent);
}