.root-page { isolation: isolate; }
.root-page .site-footer {
  text-shadow:
    -1px -1px 0 #f0f0f0,
    1px -1px 0 #f0f0f0,
    -1px 1px 0 #f0f0f0,
    1px 1px 0 #f0f0f0,
    0 0 4px #f0f0f0;
}
.seasonal-effects {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
  /* Fade every season across the central reading area, keeping the edges visible. */
  -webkit-mask-image: radial-gradient(ellipse min(560px, 58vw) 42vh at 50% 45%, rgba(0,0,0,.05) 0%, rgba(0,0,0,.05) 55%, #000 100%);
  mask-image: radial-gradient(ellipse min(560px, 58vw) 42vh at 50% 45%, rgba(0,0,0,.05) 0%, rgba(0,0,0,.05) 55%, #000 100%);
}
.seasonal-particle {
  --landing-y: calc(100vh + 60px);
  position: absolute;
  top: -30px;
  left: var(--x);
  width: var(--size);
  height: var(--size);
  animation: seasonal-fall var(--duration) var(--delay) linear infinite;
}
.seasonal-effects--spring .seasonal-particle {
  opacity: .65;
}
.seasonal-petal {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: 80% 0 80% 35%;
  background: linear-gradient(135deg, #f9d9e3, #e8a7bf);
}
.seasonal-effects--autumn .seasonal-particle { opacity: .48; }
.seasonal-particle svg { display: block; width: 100%; height: 100%; }
.seasonal-effects--autumn .seasonal-particle svg,
.seasonal-petal {
  transform-origin: 50% 55%;
  animation: seasonal-leaf-flutter var(--flutter-duration) var(--flutter-delay) ease-in-out infinite;
}
.seasonal-effects--winter .seasonal-particle {
  border-radius: 50%;
  background: #c2c5c8;
  box-shadow: 0 0 3px #d1d3d5;
  opacity: .85;
}
.seasonal-grass {
  position: absolute;
  bottom: -2px;
  left: -4px;
  right: -4px;
  height: 48px;
  background: url('/assets/img/seasons/summer-grass.png') repeat-x bottom / 420px 140px;
  opacity: .55;
  transform-origin: center bottom;
  animation: seasonal-grass-breeze 5s ease-in-out infinite alternate;
  -webkit-mask-image: linear-gradient(to right, #000 20%, #0003 40%, #0003 60%, #000 80%);
  mask-image: linear-gradient(to right, #000 20%, #0003 40%, #0003 60%, #000 80%);
}
@keyframes seasonal-grass-breeze {
  from { transform: skewX(-1deg); }
  to { transform: skewX(1deg); }
}
.seasonal-effects.is-paused .seasonal-grass,
.seasonal-effects.is-paused .seasonal-dandelion,
.seasonal-effects.is-paused .seasonal-dandelion svg,
.seasonal-effects.is-paused .seasonal-particle,
.seasonal-effects.is-paused .seasonal-petal,
.seasonal-effects.is-paused .seasonal-butterfly,
.seasonal-effects.is-paused .seasonal-butterfly svg,
.seasonal-effects.is-paused .seasonal-butterfly-wing,
.seasonal-effects.is-paused .seasonal-particle svg { animation-play-state: paused; }
.seasonal-dandelion {
  position: absolute;
  left: -40px;
  top: var(--seed-height);
  width: var(--seed-size);
  opacity: .65;
  animation: seasonal-seed-flight var(--seed-duration) var(--seed-delay) linear infinite;
}
.seasonal-dandelion svg {
  display: block;
  width: 100%;
  height: auto;
  transform-origin: 50% 35%;
  animation: seasonal-seed-sway var(--seed-sway) var(--seed-delay) ease-in-out infinite alternate;
}
@keyframes seasonal-seed-flight {
  0% { transform: translate3d(0, 0, 0); }
  25% { transform: translate3d(calc(25vw + 20px), -7vh, 0); }
  50% { transform: translate3d(calc(50vw + 40px), -4vh, 0); }
  75% { transform: translate3d(calc(75vw + 60px), -12vh, 0); }
  100% { transform: translate3d(calc(100vw + 80px), -16vh, 0); }
}
@keyframes seasonal-seed-sway {
  from { transform: translateY(-5px) rotate(-22deg); }
  to { transform: translateY(5px) rotate(16deg); }
}
.seasonal-butterfly {
  position: absolute;
  bottom: 8px;
  left: var(--spawn-x);
  width: var(--butterfly-size);
  opacity: 0;
  animation: seasonal-butterfly-flight var(--flight-duration) var(--flight-delay) linear infinite;
}
.seasonal-butterfly svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
  transform: scaleX(var(--heading));
}
.seasonal-butterfly-wing {
  transform-box: view-box;
  transform-origin: 44px 44px;
  animation: seasonal-butterfly-flap var(--flap-duration) var(--flight-delay) steps(1, end) infinite;
}
@keyframes seasonal-butterfly-flight {
  0% { opacity: 0; transform: translate3d(0, 10px, 0); }
  5% { opacity: .7; transform: translate3d(calc(var(--travel-x) * .08), -18px, 0); }
  18% { opacity: .7; transform: translate3d(calc(var(--travel-x) * .25), -65px, 0); }
  32% { opacity: .7; transform: translate3d(calc(var(--travel-x) * .45), -48px, 0); }
  46% { opacity: .7; transform: translate3d(calc(var(--travel-x) * .65), -105px, 0); }
  60% { opacity: .7; transform: translate3d(calc(var(--travel-x) * .85), -85px, 0); }
  70% { opacity: 0; transform: translate3d(var(--travel-x), -140px, 0); }
  100% { opacity: 0; transform: translate3d(var(--travel-x), -140px, 0); }
}
/* Two side-view poses: raised wings, then a short downstroke. */
@keyframes seasonal-butterfly-flap {
  0% { transform: rotate(-6deg) scaleX(1); }
  50% { transform: rotate(8deg) scaleX(.55); }
}
.seasonal-controls {
  position: fixed;
  top: 12px;
  right: 14px;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 6px;
}
.seasonal-select, .seasonal-background-toggle {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 5px 9px;
  border: 1px solid #d8d8d8;
  border-radius: 20px;
  background: #f0f0f0e6;
  color: #666;
  font: inherit;
  font-size: 10px;
  cursor: pointer;
}
.seasonal-select:hover, .seasonal-background-toggle:hover { color: #222; border-color: #999; }
.seasonal-select:focus-visible, .seasonal-background-toggle:focus-visible { outline: 2px solid #f5821f; outline-offset: 3px; }
.seasonal-background-toggle[aria-pressed="true"] { border-color: #e9c5a7; background: #fff0e3; color: #a84c0b; }
.seasonal-background-toggle { width: 28px; height: 28px; padding: 5px; justify-content: center; }
.seasonal-background-toggle svg { display: block; width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
.seasonal-select::after {
  width: 5px;
  height: 5px;
  border-right: 1px solid currentColor;
  border-bottom: 1px solid currentColor;
  content: '';
  transform: translateY(-2px) rotate(45deg);
}
.seasonal-select[aria-expanded="true"]::after { transform: translateY(1px) rotate(225deg); }
.seasonal-options {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 176px;
  padding: 5px;
  border: 1px solid #ddd;
  border-radius: 12px;
  background: #fafafa;
  box-shadow: 0 6px 20px rgba(0,0,0,.09);
}
.seasonal-options[hidden] { display: none; }
.seasonal-option {
  display: block;
  width: 100%;
  padding: 9px 10px;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: #666;
  font: inherit;
  font-size: 11px;
  text-align: left;
  cursor: pointer;
}
.seasonal-option:hover { background: #eee; }
.seasonal-option[aria-pressed="true"] { background: #fff0e3; color: #a84c0b; }
.seasonal-option[aria-pressed="true"]::after { float: right; content: '✓'; }
.seasonal-option:focus-visible { outline: 2px solid #f5821f; outline-offset: -2px; }
.seasonal-ground {
  position: absolute;
  inset: auto 0 0;
  height: 12px;
}
.seasonal-streetlamp {
  position: absolute;
  bottom: 0;
  left: 7%;
  height: clamp(240px, 38vh, 380px);
  aspect-ratio: 2 / 3;
  transform: translateX(-50%);
  opacity: .65;
}
.seasonal-streetlamp img { display: block; width: 100%; height: 100%; object-fit: contain; }
.seasonal-streetlamp::before {
  position: absolute;
  top: 10%;
  left: 29%;
  width: 42%;
  height: 19%;
  border-radius: 50%;
  background: radial-gradient(ellipse, #ffe2a64d, #ffe2a600 70%);
  content: '';
}
.seasonal-effects--autumn .seasonal-streetlamp,
.seasonal-effects--winter .seasonal-streetlamp { bottom: -12px; }
.seasonal-effects--winter .seasonal-streetlamp { opacity: .8; }
.seasonal-effects--winter .seasonal-streetlamp img { filter: brightness(.65) saturate(.25); }
.seasonal-effects--winter .seasonal-streetlamp::before { background: radial-gradient(ellipse, #d9e1e82b, #d9e1e800 70%); }
.seasonal-tree {
  position: absolute;
  bottom: -30px;
  left: 7%;
  height: clamp(240px, 38vh, 380px);
  width: auto;
  max-width: 27vw;
  object-fit: contain;
  object-position: bottom;
  transform: translateX(-50%);
  opacity: .55;
}
.seasonal-effects--spring .seasonal-tree { filter: saturate(.8); }
.seasonal-effects--summer .seasonal-tree { filter: saturate(.85); opacity: .48; }
.seasonal-mound { position: absolute; bottom: 0; opacity: .8; overflow: hidden; }
.seasonal-effects--autumn .seasonal-mound { opacity: .5; filter: saturate(.6); }
.seasonal-mound img {
  position: absolute;
  left: 0;
  display: block;
  width: 100%;
  max-width: none;
  object-fit: fill;
}
/* Keep the original PNGs intact; frame their transparent margins in the layout. */
.seasonal-effects--spring .seasonal-mound img { height: 191.54%; bottom: -32.8%; }
.seasonal-effects--autumn .seasonal-mound img { height: 224.85%; bottom: -30.44%; }
.seasonal-effects--winter .seasonal-mound img { height: 286.33%; bottom: -75%; }
@keyframes seasonal-fall {
  0% { transform: translate3d(0, -30px, 0) rotate(0); }
  25% { transform: translate3d(calc(var(--drift) * .25 + var(--gust)), calc(var(--landing-y) * .25 - 22.5px), 0) rotate(calc(var(--turn) * .25)); }
  50% { transform: translate3d(calc(var(--drift) * .5 - var(--gust) * .3), calc(var(--landing-y) * .5 - 15px), 0) rotate(calc(var(--turn) * .5)); }
  75% { transform: translate3d(calc(var(--drift) * .75 + var(--gust) * .6), calc(var(--landing-y) * .75 - 7.5px), 0) rotate(calc(var(--turn) * .75)); }
  100% { transform: translate3d(var(--drift), var(--landing-y), 0) rotate(var(--turn)); }
}

/* The SVG turns independently of its falling parent, revealing a narrow edge. */
@keyframes seasonal-leaf-flutter {
  0% { transform: perspective(180px) rotateZ(var(--tilt)) rotateX(25deg) rotateY(65deg); }
  25% { transform: perspective(180px) rotateZ(calc(var(--tilt) + 20deg)) rotateX(-15deg) rotateY(150deg); }
  50% { transform: perspective(180px) rotateZ(calc(var(--tilt) - 12deg)) rotateX(35deg) rotateY(245deg); }
  75% { transform: perspective(180px) rotateZ(calc(var(--tilt) + 15deg)) rotateX(-25deg) rotateY(330deg); }
  100% { transform: perspective(180px) rotateZ(var(--tilt)) rotateX(25deg) rotateY(425deg); }
}
@media (max-width: 680px) {
  .seasonal-effects, .seasonal-controls { display: none; }
}
@media (forced-colors: active), print {
  .seasonal-effects, .seasonal-controls { display: none; }
}