:root{
  --bg: #fffef7;
  --ink: #121212;
  --brand: #ffcf00;     /* groc cartell */
  --brand-2: #ff2f2f;   /* vermell donacions */
  --accent: #25aeea;    /* blau cartell */
  --muted: #6b6b6b;
  --radius: 16px;
}

*{ box-sizing:border-box; }
html,body{ margin:0; padding:0; }
body{
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.5;
}

/* layout helpers */
.container{
  width: min(1100px, 92%);
  margin-inline: auto;
}

.site-header{
  background: #fff;
  border-bottom: 1px solid #eee;
  position: sticky; top:0; z-index: 10;
}
.header-inner{
  display: flex; align-items: center; justify-content: space-between;
  padding: .75rem 0;
}
.brand img{ display:block; height:auto; max-width:160px; }

.nav a{
  text-decoration: none;
  color: var(--ink);
  margin-left: 1rem;
  font-weight: 600;
}
.nav a:hover{ color: var(--accent); }

.hero{
  background: linear-gradient(180deg, var(--brand) 0%, #ffe978 100%);
  color: #111;
  padding: 3.5rem 0 2.5rem;
  text-align: center;
}
.hero .lead{
  font-size: clamp(1rem, 1.2rem + 0.4vw, 1.35rem);
  max-width: 58ch;
  margin: .5rem auto 1.25rem;
}

.btn{
  display:inline-block;
  background: var(--ink);
  color:#fff;
  padding:.75rem 1.1rem;
  border-radius: 999px;
  text-decoration:none;
  font-weight:700;
}
.btn:hover{ opacity:.9; }
.btn-outline{
  background: transparent; color: var(--ink);
  border:2px solid var(--ink);
}

main{ padding: 2rem 0; }
h1,h2,h3,h4{ line-height:1.2; margin: .2rem 0 .6rem; }
h1{ font-size: clamp(1.6rem, 2rem + 1vw, 3rem); }
h2{ font-size: clamp(1.3rem, 1.4rem + .6vw, 2rem); }
h3{ font-size: clamp(1.05rem, 1.05rem + .4vw, 1.35rem); }

.muted{ color: var(--muted); margin-top:-.25rem; }

.grid-3{
  display:grid; gap:1rem; margin-top:1rem;
  grid-template-columns: 1fr;
}
@media (min-width: 760px){
  .grid-3{ grid-template-columns: repeat(3, 1fr); }
}

.card{
  background:#fff; border:1px solid #eee; border-radius: var(--radius);
  padding:1rem;
  box-shadow: 0 6px 18px rgba(0,0,0,.04);
}

.cta{
  background: linear-gradient(180deg, #ffffff 0%, #eaf7ff 100%);
  padding: 2rem 0 2.5rem;
}
.cta-actions{ display:flex; gap:.8rem; flex-wrap:wrap; margin-top:.6rem; }

.site-footer{
  background:#111; color:#eee;
  padding: 1.5rem 0 0;
  margin-top: 2rem;
}
.footer-grid{
  display:grid; gap:1rem;
  grid-template-columns: 1fr;
}
.footer-grid h4{ margin-top:0; color:#fff; }
.footer-grid a{ color:#cfe9ff; text-decoration:none; }
.footer-grid a:hover{ text-decoration:underline; }
@media (min-width: 760px){
  .footer-grid{ grid-template-columns: 1fr 1fr; }
}
.legal{
  margin:1rem 0 0; padding: .8rem 0;
  text-align:center; color:#bbb; border-top: 1px solid #222;
}

/* millora d’accessibilitat per focus via teclat */
a:focus, button:focus{ outline: 3px solid var(--accent); outline-offset:3px; }