/* Root*/
:root{
  /* Palette neutra */
  --bg: #0b0f14;
  --panel: #111825;
  --panel-2: #0f1520;
  --text: #e9eef5;
  --muted: #b7c2d0;
  --brand: #7ee2b8;     /* accento “sostenibilità” */
  --brand-2: #69b3ff;   /* accento secondario */
  --border: rgba(255,255,255,0.10);

  --radius: 16px;
  --shadow: 0 12px 30px rgba(0,0,0,0.35);
  --max: 1100px;
}

*{ box-sizing: border-box; }

html, body{
  margin: 0;
  padding: 0;
}

body{
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  background: radial-gradient(1200px 800px at 20% 0%, rgba(126,226,184,0.12), transparent 60%),
              radial-gradient(1200px 800px at 90% 20%, rgba(105,179,255,0.10), transparent 55%),
              var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a{
  color: inherit;
  text-decoration: none;
}

a:hover{
  text-decoration: underline;
}

/* Contenitore per centrare e dare respiro */
.container{
  width: min(100% - 32px, var(--max));
  margin: 0 auto;
}

/* Qui SKIP LINK*/

.skip-link{
  position: absolute;
  left: -999px;
  top: 12px;
  background: var(--text);
  color: #000;
  padding: 10px 12px;
  border-radius: 10px;
  z-index: 9999;
}

.skip-link:focus{
  left: 12px; /* appare quando si usa TAB */
}

/* HEADER / NAV */

.site-header{
  position: sticky;
  top: 0;
  backdrop-filter: blur(10px);
  background: rgba(11,15,20,0.65);
  border-bottom: 1px solid var(--border);
  z-index: 10;
}

.site-header .container{
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  gap: 16px;
}

.brand{
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: 0.2px;
}

.brand__mark{
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(126,226,184,0.35), rgba(105,179,255,0.25));
  border: 1px solid var(--border);
}

.nav{
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.nav a{
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid transparent;
}

.nav a:focus,
.nav a:hover{
  border-color: var(--border);
  text-decoration: none;
}

/* sezione hero*/

.hero{
  padding: 42px 0 18px;
}

.hero__grid{
  display: grid;
  gap: 18px;
  grid-template-columns: 1.6fr 1fr;
  align-items: start;
}

h1{
  font-size: clamp(1.8rem, 2.5vw, 2.5rem);
  line-height: 1.15;
  margin: 0 0 12px;
}

.lead{
  color: var(--muted);
  margin: 0 0 18px;
  font-size: 1.05rem;
}

.hero__cta{
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 0 0 12px;
}

.hero__card{
  background: linear-gradient(180deg, rgba(17,24,37,0.9), rgba(15,21,32,0.9));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
}

.h3{
  font-size: 1.1rem;
  margin: 0 0 10px;
}

.bullets{
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
}

.fineprint{
  color: var(--muted);
  font-size: 0.92rem;
}

/* Griglie */

.section{
  padding: 34px 0;
}

.section--alt{
  background: rgba(255,255,255,0.02);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

h2{
  margin: 0 0 10px;
  font-size: 1.5rem;
}

p{
  margin: 0 0 14px;
}

.grid{
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 14px;
}

.card{
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: rgba(17,24,37,0.65);
  padding: 16px;
}

.card h3{
  margin: 0 0 8px;
}

.card p{
  color: var(--muted);
  margin: 0;
}

/* Download list */

.downloads{
  display: grid;
  gap: 12px;
  margin-top: 14px;
}

.download-item{
  display: flex;
  gap: 14px;
  justify-content: space-between;
  align-items: center;
  padding: 16px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: rgba(17,24,37,0.65);
}

.download-item__meta h3{
  margin: 6px 0 4px;
}

.muted{
  color: var(--muted);
}

.tag{
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(126,226,184,0.10);
  color: var(--text);
  font-size: 0.9rem;
}

.note{
  margin-top: 14px;
  padding: 14px 16px;
  border-radius: var(--radius);
  border: 1px dashed rgba(255,255,255,0.22);
  color: var(--muted);
  background: rgba(0,0,0,0.18);
}

/*   BOTTONI */

.button{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.16);
  background: linear-gradient(135deg, rgba(126,226,184,0.35), rgba(105,179,255,0.25));
  font-weight: 650;
  text-decoration: none;
}

.button:hover{
  text-decoration: none;
  border-color: rgba(255,255,255,0.28);
}

.button--ghost{
  background: rgba(255,255,255,0.04);
}

.button:focus,
.nav a:focus,
a:focus{
  outline: 3px solid rgba(126,226,184,0.55);
  outline-offset: 2px;
}

/* Lista processo */

.steps{
  margin: 12px 0 0;
  padding-left: 18px;
}

.steps li{
  margin: 10px 0;
  color: var(--muted);
}

/* footer */

.site-footer{
  border-top: 1px solid var(--border);
  padding: 20px 0;
  color: var(--muted);
}

/* Responsive */

@media (max-width: 900px){
  .hero__grid{
    grid-template-columns: 1fr;
  }

  .grid{
    grid-template-columns: 1fr;
  }

  .download-item{
    flex-direction: column;
    align-items: stretch;
  }
}