/* Responsive */
@media (max-width:600px) {
  header {
    justify-content: space-between;
    padding: 0 1rem;
  }
  #logo {
    width: clamp(60px, 18vw, 120px);
  }
}

@media (max-width: 880px) {
  header {
    justify-content: space-between;
    padding: 0 1.2rem;
  }
  #logo {
    width: clamp(70px, 15vw, 140px);
  }
}

/* --- HEADER --- */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;

  height: clamp(35px, 7vh, 70px);
  width: 100%;

  /* 🔹 Default trasparente */
  background-color: transparent;
  box-shadow: none;

  overflow: hidden;
  transform: translateY(0);
  transition: transform 0.4s ease, background-color 0.3s ease, box-shadow 0.3s ease;
  z-index: 2000;
}

.contact header {
  background-color: #f9f9f9 !important;
  box-shadow: 0 0.4vw 1vw rgba(0,0,0,0.15) !important;
}

/* 🔹 Al passaggio del mouse prende colore */
header:hover {
  background-color: #f9f9f9;
  box-shadow: 0 0.4vw 1vw rgba(0,0,0,0.15);
}

header.hidden {
  transform: translateY(-100%);
  transition: transform 0.4s ease;
}

header.scrolled {
  background-color: #f9f9f9; /* colore pieno */
  box-shadow: 0 0.4vw 1vw rgba(0,0,0,0.15);
}

/* --- LOGO --- */
/* Default trasparente → logo_2 */
.about #logo {
  content: url(../img/logo.png);
}

body #logo {
  content: url(../img/logo_2.png);
}

#logo {
  width: clamp(80px, 10vw, 160px);
  height: auto;
  max-width: 100%;
  object-fit: contain;
  transition: opacity 0.4s ease;
  image-rendering: auto;

  margin: 0;
  align-self: center;
}

/* Header colorata → logo principale */
header:hover #logo,
header.menu-open #logo,
header.scrolled #logo {
  content: url(../img/logo.png);
}

/* --- HAMBURGER --- */
.hamburger-btn {
  position: absolute;
  left: clamp(8px, 2vw, 20px);
  top: 50%;
  transform: translateY(-50%);
  width: clamp(20px, 4vw, 40px);
  height: clamp(14px, 2.5vw, 30px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: transparent;
  border: 0;
  padding: 0;
  cursor: pointer;
}

.hamburger-inner {
  width: 100%;
  height: clamp(6px, 1vw, 10px);
  display: block;
  position: relative;
}

.hamburger-inner span {
  position: absolute;
  left: 0;
  width: 80%;
  height: clamp(1.5px, 0.2vw, 3px);
  border-radius: clamp(2px, 0.3vw, 4px);
  display: block;
  transform-origin: center;
  transition: background 0.3s ease,
              transform 0.35s cubic-bezier(0.68, -0.55, 0.27, 1.55);
}

.contact .hamburger-inner span {
  background: #111 !important;
}

/* Default trasparente → linee chiare */
header .hamburger-inner span {
  background: #f9f9f9;
}

.about header .hamburger-inner span {
  background-color: transparent;
}

/* Header colorata → linee scure */
header:hover .hamburger-inner span,
header.menu-open .hamburger-inner span,
header.scrolled .hamburger-inner span {
  background: #111;
}

.hamburger-inner span.top { top: 0; }
.hamburger-inner span.bottom { bottom: 0; }

/* --- ANIMAZIONE X --- */
/* Stato attivo hamburger → X */
/* Linee hamburger */
/* Linee hamburger */
/* Stato normale: linee sopra e sotto */
.hamburger-inner span.top {
  top: 0;
  left: 50%;
  transform: translateX(-50%);
}

.hamburger-inner span.bottom {
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
}

/* Stato attivo → X perfetta */
.hamburger-btn.active .hamburger-inner span.top {
  top: 50%;
  transform: translate(-50%, -50%) rotate(45deg);
}

.hamburger-btn.active .hamburger-inner span.bottom {
  bottom: auto; /* reset */
  top: 50%;
  transform: translate(-50%, -50%) rotate(-45deg);
}


@media (max-width: 600px) {
  .hamburger-btn.active .hamburger-inner span {
    top: 50%;
    left: 50%;
    transform-origin: center;
  }
  .hamburger-btn.active .hamburger-inner span.top {
    transform: translate(-50%, -50%) rotate(45deg);
  }
  .hamburger-btn.active .hamburger-inner span.bottom {
    transform: translate(-50%, -50%) rotate(-45deg);
  }
}



/* --- FOCUS --- */
.hamburger-btn:focus {
  outline: clamp(1px, 0.15vw, 2px) solid rgba(0,0,0,0.12);
  outline-offset: clamp(2px, 0.3vw, 4px);
}

/* Stato menu aperto forzato */
header.menu-open {
  background-color: #f9f9f9 !important;
  box-shadow: 0 0.4vw 1vw rgba(0,0,0,0.15) !important;
}