/* Background, top nav, page arrows, panel transitions and entrance stagger */

/* Shifting gradient backdrop (oversized so panel slides never expose an edge) */
.bg {
  position: fixed;
  top: -10vw;
  left: -30vw;
  right: -30vw;
  bottom: -10vw;
  background: linear-gradient(315deg, #f6f6f6 0%, #d1cde3 80%);
  z-index: 0;
  transform: translateX(0);
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: transform;
}
.bg[data-shift="right"] { transform: translateX(20vw); }
.bg[data-shift="left"]  { transform: translateX(-20vw); }
.bg[data-shift="none"]  { transform: translateX(0); }

/* Top-right nav: only the active page's label is shown */
.nav {
  position: fixed;
  top: 28px;
  right: 36px;
  z-index: 100;
  height: 44px;
  min-width: 132px;
  transition: opacity 0.5s ease 0.15s;
}
.nav-btn {
  position: absolute;
  top: 0;
  right: 0;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--petal-blue);
  padding: 4px 2px;
  letter-spacing: 0.04em;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transform: translateX(24px);
  transition: opacity 0.35s ease, transform 0.35s ease;
}
.nav-btn::after {
  content: '';
  position: absolute;
  left: 2px;
  bottom: 0;
  width: calc(100% - 4px);
  height: 2px;
  background: var(--petal-blue);
  opacity: 0.5;
}
/* Pre-set start offset so the active label slides in from the click direction */
.nav-btn.from-left  { transform: translateX(-24px); }
.nav-btn.from-right { transform: translateX(24px); }
.nav-btn.active {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(0);
}

/* Prev/next page arrows */
.page-arrow {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  z-index: 90;
  width: 64px;
  height: 64px;
  border: none;
  background: none;
  cursor: pointer;
  color: var(--petal-blue);
  opacity: 0.55;
  transition: opacity 0.25s ease, transform 0.25s ease;
}
.page-arrow::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 26px;
  height: 26px;
  border-left: 5px solid currentColor;
  border-bottom: 5px solid currentColor;
  border-radius: 2px;
}
.page-arrow-left  { left: 24px; }
.page-arrow-right { right: 24px; }
.page-arrow-left::before  { transform: translate(-30%, -50%) rotate(45deg); }
.page-arrow-right::before { transform: translate(-70%, -50%) rotate(-135deg); }
.page-arrow:hover { opacity: 1; }
.page-arrow-left:hover  { transform: translateY(-50%) translateX(-4px); }
.page-arrow-right:hover { transform: translateY(-50%) translateX(4px); }
.page-arrow.disabled {
  opacity: 0;
  pointer-events: none;
}

/* Panels container fades in once the loader reveals the page */
.panels {
  position: fixed;
  inset: 0;
  z-index: 10;
  opacity: 0;
  transition: opacity 0.7s cubic-bezier(0.1, 0.9, 0.2, 1);
}
body.loaded .panels { opacity: 1; }
body:not(.loaded) .nav { opacity: 0; pointer-events: none; }
body:not(.loaded) .page-arrow { opacity: 0 !important; pointer-events: none; }

/* A single panel; only .active is visible */
.panel {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
}
.panel.active {
  opacity: 1;
  pointer-events: auto;
}
.panel.exit-left  { transform: translateX(-72px); }
.panel.exit-right { transform: translateX(72px); }
.panel.enter-left  { transform: translateX(-48px); }
.panel.enter-right { transform: translateX(48px); }
.panel.enter-center { transform: translateX(0); }

/* Staggered per-element entrance, replayed whenever a panel gains .intro */
.panel:not(.intro) .top .avatar,
.panel:not(.intro) .top .info,
.panel:not(.intro) .button-group .button,
.panel:not(.intro) .wander-head,
.panel:not(.intro) .wander-viewport {
  opacity: 0;
}
.panel.intro .top .avatar {
  animation: pop-left 1.3s cubic-bezier(0.26, 1.44, 0.4, 1) 0.1s both,
             avatar-pulse 2.2s cubic-bezier(0.22, 1, 0.36, 1) 1.1s;
}
.panel.intro .top .info {
  animation: slide-right 1.4s cubic-bezier(0.1, 0.9, 0.2, 1) 0.6s both;
}
.panel.intro .button-group .button {
  animation: rise-in 1s cubic-bezier(0.1, 0.9, 0.2, 1) both;
}
.panel.intro .button-group .button:nth-child(1) { animation-delay: 1.0s; }
.panel.intro .button-group .button:nth-child(2) { animation-delay: 1.2s; }
.panel.intro .button-group .button:nth-child(3) { animation-delay: 1.4s; }
.panel.intro .button-group .button:nth-child(4) { animation-delay: 1.6s; }
.panel.intro .button-group .button:nth-child(5) { animation-delay: 1.8s; }
.panel.intro .wander-head {
  animation: rise-in 1.2s cubic-bezier(0.1, 0.9, 0.2, 1) 0.2s both;
}
.panel.intro .wander-viewport {
  animation: fade-in 1.3s ease 0.6s both;
}
@keyframes pop-left {
  from { opacity: 0; transform: translateX(-44px) scale(0.7); }
  to   { opacity: 1; transform: translateX(0) scale(1); }
}
@keyframes slide-right {
  from { opacity: 0; transform: translateX(44px); }
  to   { opacity: 1; transform: translateX(0); }
}
@keyframes rise-in {
  from { opacity: 0; transform: translateY(26px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes avatar-pulse {
  0%   { box-shadow: 0 0 0 0 rgba(140, 108, 224, 0.55), 0 0 12px rgba(175, 180, 200, 0.3), 0 4px 12px rgba(120, 130, 160, 0.2); }
  70%  { box-shadow: 0 0 0 60px rgba(140, 108, 224, 0), 0 0 12px rgba(175, 180, 200, 0.3), 0 4px 12px rgba(120, 130, 160, 0.2); }
  100% { box-shadow: 0 0 0 60px rgba(140, 108, 224, 0), 0 0 12px rgba(175, 180, 200, 0.3), 0 4px 12px rgba(120, 130, 160, 0.2); }
}