:root{
  --bg:#0b2540;
  --paper:#f8fbff;
  --accent:#9be7ff;
  --ink:#113243;
  --muted:#6b7c86;
  --shadow: 0 10px 30px rgba(2,12,25,0.5);
  --page-width: 520px;
  --page-height: 700px;
  --image-size: 320px;
  font-family: 'Nunito', system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
}

*{box-sizing:border-box}
body{
  margin:0;
  min-height:100vh;
  background:
    radial-gradient(1200px 600px at 10% 10%, rgba(155,231,255,0.08), transparent 10%),
    linear-gradient(180deg, #071526 0%, #07223a 100%);
  color:var(--paper);
  display:flex;
  align-items:center;
  justify-content:center;
  padding:28px;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

.page-app{
  width:100%;
  max-width:1200px;
  text-align:center;
  min-height: calc(100vh - 56px);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

header h1{
  margin:0 0 6px 0;
  font-size:28px;
  color:var(--paper);
  letter-spacing:0.4px;
}
.subtitle{
  margin:0 0 24px 0;
  color:var(--muted);
}

/* Book layout */
.book-wrap{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:20px;
  flex-direction:column;
  flex: 1;
  min-height: 0;
}

.book-container{
  position:relative;
  display:grid;
  place-items:center;
  min-height: calc(var(--page-height) + 40px);
}

.book{
  width: calc(var(--page-width) + 40px);
  perspective: 2000px;
  position:relative;
  display:grid;
  place-items:center;
}

.page{
  width:var(--page-width);
  height:var(--page-height);
  background:linear-gradient(180deg,var(--paper), #eef7ff 60%);
  color:var(--ink);
  border-radius:10px;
  box-shadow:var(--shadow);
  position:absolute;
  left:50%;
  transform-origin:left center;
  transform:translateX(-50%);
  transition: transform 700ms cubic-bezier(.2,.8,.2,1), z-index 0ms linear 0ms;
  overflow:hidden;
  display:flex;
  align-items:flex-start;
  justify-content:center;
  padding:0;
  user-select:none;
  -webkit-user-select:none;
  cursor:pointer;
  backface-visibility:hidden;
  touch-action: pan-x;
}

.page-inner{
  text-align:left;
  width:100%;
  padding:32px 28px 24px 28px;
  display:flex;
  flex-direction:column;
  align-items:center;
}

.page-image{
  width:var(--image-size);
  height:var(--image-size);
  background:linear-gradient(135deg,#e5f3fa 80%, #c6e9ff 100%);
  border:3px solid #d1eaff;
  border-radius:16px;
  margin-bottom:24px;
  display:flex;
  align-items:center;
  justify-content:center;
  position:relative;
  box-shadow:0 3px 14px rgba(100,180,255,0.07);
  overflow:hidden;
  user-select: none;
  touch-action: none;
}
.page-image img {
  width:100%;
  height:100%;
  object-fit:cover;
  border-radius:14px;
  display:block;
}
.page-image svg {
  width:100%;
  height:100%;
  display:block;
}

/* Klickområden för bläddring: synliga på desktop, osynliga på mobil (kan tas bort) */
.click-area {
  position:absolute;
  top:0; bottom:0;
  z-index:10;
  cursor:pointer;
  transition: background 0.2s;
}
.click-area.left {
  left:0; width:25%;
  background:rgba(155,231,255,0.09);
}
.click-area.right {
  right:0; width:75%;
  background:rgba(155,231,255,0.04);
}
.click-area:hover {
  background:rgba(155,231,255,0.18);
}
@media (max-width:900px){
  .click-area {background:transparent;}
}

/* Slight visual difference for pages to imitate thickness */
.page:nth-child(odd){
  box-shadow: 0 12px 30px rgba(2,12,25,0.45);
}

.page h2{
  margin-top:0;
  margin-bottom:10px;
  color:#0e3b4a;
  text-align:center;
}
.page p{
  color:#09323e;
  line-height:1.5;
  margin-bottom:10px;
  font-size:16px;
  text-align:left;
}

/* Flipped state */
.page.flipped{
  transform: translateX(-50%) rotateY(-180deg);
  z-index:0 !important;
  transition: transform 700ms cubic-bezier(.2,.8,.2,1);
  box-shadow: inset -10px 0 30px rgba(0,0,0,0.06);
}

/* Stack order */
.page[data-page="1"]{ z-index:100; left:calc(50% - 2px) }
.page[data-page="2"]{ z-index:99; left:calc(50% - 1px) }
.page[data-page="3"]{ z-index:98 }
.page[data-page="4"]{ z-index:97 }
.page[data-page="5"]{ z-index:96 }
.page[data-page="6"]{ z-index:95 }
.page[data-page="7"]{ z-index:94 }
.page[data-page="8"]{ z-index:93 }
.page[data-page="9"]{ z-index:92 }
.page[data-page="10"]{ z-index:91 }

.page.flipped[data-page="1"]{ left:20% }
.page.flipped[data-page="2"]{ left:20% }
.page.flipped[data-page="3"]{ left:20% }
.page.flipped[data-page="4"]{ left:20% }
.page.flipped[data-page="5"]{ left:20% }
.page.flipped[data-page="6"]{ left:20% }
.page.flipped[data-page="7"]{ left:20% }
.page.flipped[data-page="8"]{ left:20% }
.page.flipped[data-page="9"]{ left:20% }
.page.flipped[data-page="10"]{ left:20% }

/* Knappar och indikator under boken */
.controls{
  margin-top:28px;
  display:flex;
  align-items:center;
  gap:12px;
  justify-content:center;
}

.nav-btn{
  background:linear-gradient(180deg,var(--accent), #6fd8ff);
  color:var(--ink);
  border:0;
  padding:10px 16px;
  border-radius:8px;
  font-weight:700;
  cursor:pointer;
  box-shadow:0 6px 14px rgba(7,30,48,0.25);
  min-width:90px;
}
.nav-btn:active{ transform:translateY(1px) }

.page-indicator{
  color:var(--paper);
  font-weight:600;
  background:rgba(255,255,255,0.03);
  padding:8px 12px;
  border-radius:10px;
  min-width:120px;
}

.credits{
  margin-top:14px;
  color:var(--muted);
}

.swipe-hint {
  margin-top:8px;
  color:var(--muted);
  font-size:15px;
  text-align:center;
  opacity:0.8;
}

@media (max-width:900px){
  :root{ --page-width:360px; --page-height:520px; --image-size:180px; }
  .book{ width:calc(var(--page-width) + 20px) }
  .page-inner{padding:18px 10px 10px 10px;}
  .nav-btn {
    padding:14px 18px;
    font-size:18px;
  }
  .click-area {background:transparent;}
}

@media (max-width:450px){
  :root{ --page-width:98vw; --page-height:62vh; --image-size:110px; }
  .page-inner{padding:10px 2vw 10px 2vw;}
  .nav-btn{font-size:15px;}
}