:root {
  --text: #4a4a4a;
  --title: #121212;
  --bg: #fff;
  --gutter: 25px;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
a:hover { opacity: .6; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
ul { list-style: none; margin: 0; padding: 0; }

/* Header */
.site-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 20px var(--gutter);
  position: relative;
  z-index: 10;
}
.site-title { margin: 0; font-size: 13px; font-weight: 400; letter-spacing: 2px; line-height: 1.2; color: var(--title); text-transform: lowercase; }
.site-title a { color: rgba(0,0,0,.8); }
.main-nav { text-transform: lowercase; }
.main-nav ul { display: flex; gap: 28px; }
.main-nav a, .sub-toggle { font-size: 13px; letter-spacing: .3px; opacity: .8; }
.main-nav a.active { opacity: 1; border-bottom: 1px solid currentColor; }
.sub-toggle { text-transform: lowercase; line-height: 1.4; }
.sub-toggle:hover { opacity: .6; }
.has-sub.open > .sub-toggle { opacity: 1; }

/* Sottomenu: dissolvenza all'apertura */
.submenu {
  display: grid; grid-template-rows: 0fr; opacity: 0; visibility: hidden;
  transition: grid-template-rows .35s ease, opacity .35s ease, visibility 0s linear .35s;
}
.main-nav .submenu > ul { overflow: hidden; min-height: 0; display: block; gap: 0; padding-left: 14px; }
.submenu li { padding-top: 8px; }
.has-sub.open > .submenu {
  grid-template-rows: 1fr; opacity: 1; visibility: visible;
  transition: grid-template-rows .35s ease, opacity .35s ease, visibility 0s;
}
@media (prefers-reduced-motion: reduce) { .submenu, .has-sub.open > .submenu { transition: none; } }
.menu-toggle { display: none; font-size: 16px; }

/* Gallery */
.gallery { padding: 0 var(--gutter) 0; }
.slideshow {
  position: relative;
  height: calc(100vh - 150px);
  min-height: 320px;
}
.slide { position: absolute; inset: 0; margin: 0; display: none; align-items: center; justify-content: center; }
.slide.is-active { display: flex; }
.slide img { max-width: 100%; max-height: 100%; width: auto; height: auto; object-fit: contain; }
.hit { position: absolute; top: 0; bottom: 0; width: 50%; z-index: 2; }
.hit.prev-slide { left: 0; cursor: w-resize; }
.hit.next-slide { right: 0; cursor: e-resize; }

.gallery-controls {
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  height: 60px; font-size: 11px; letter-spacing: .5px;
}
.numbers { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.num { opacity: .4; }
.num.is-active, .num:hover { opacity: 1; }
.pager button:hover, .thumbnail-toggle:hover { opacity: .6; }

.thumbnails {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 14px;
  padding: 10px 0 30px; align-items: end;
}
.thumbnails[hidden] { display: none; }
.thumb img { width: 100%; height: auto; display: block; }
.gallery.show-thumbs .slideshow { display: none; }

/* Books */
.books { padding: 20px var(--gutter) 80px; max-width: 760px; margin: 0 auto; }
.book { margin-bottom: 80px; }
.book img { width: 100%; height: auto; display: block; margin-bottom: 20px; }
.book h3 { font-size: 15px; font-weight: 400; margin: 0 0 12px; color: var(--title); }
.book p { margin: 0 0 12px; }
.book-link a { font-style: italic; font-weight: 700; }

/* Info */
.info { padding: 20px var(--gutter) 100px; max-width: 560px; margin: 0 auto; font-size: 12px; line-height: 1.7; }
.info-portrait { width: 100%; height: auto; display: block; margin-bottom: 24px; }
.info p { margin: 0 0 22px; }

/* Desktop: titolo e menu in colonna a sinistra */
@media (min-width: 761px) {
  :root { --side: 230px; --content-top: 90px; }
  body { padding-left: var(--side); }
  .site-header {
    position: fixed; top: 0; left: 0; bottom: 0; width: var(--side);
    flex-direction: column; align-items: flex-start; justify-content: flex-start;
    padding: 20px var(--gutter);
  }
  /* la prima voce del menu parte alla stessa quota del bordo superiore della foto */
  .main-nav { position: absolute; top: calc(var(--content-top) - 3px); left: var(--gutter); }
  .main-nav ul { flex-direction: column; gap: 8px; }
  .main-nav a { display: inline-block; font-size: 13px; line-height: 1.4; }
  .gallery { padding-top: var(--content-top); padding-left: 0; }
  .slideshow { height: calc(100vh - var(--content-top) - 80px); }
  .gallery-static .slideshow { height: calc(100vh - var(--content-top) - 20px); }
  .slide { align-items: flex-start; }
  .books, .info { margin-left: 0; margin-right: auto; padding-top: var(--content-top); }
}

/* Mobile */
@media (max-width: 760px) {
  :root { --gutter: 20px; }
  .menu-toggle { display: block; }
  .main-nav { display: none; position: fixed; inset: 0; background: #fff; padding: 70px var(--gutter) 20px; }
  .main-nav.open { display: block; }
  .main-nav ul { flex-direction: column; gap: 6px; }
  .main-nav a, .sub-toggle { font-size: 22px; line-height: 1.8; }
  .submenu li { padding-top: 0; }
  .main-nav a.active { border: 0; }
  .menu-toggle { position: relative; z-index: 20; }
  .slideshow { height: auto; min-height: 0; }
  .slide { position: static; display: none; }
  .slide.is-active { display: block; }
  .slide img { width: 100%; height: auto; }
  .numbers { display: none; }
}