/* ============================================================
   page.css: shared function-page template (Haldi, Sangeet, Mayra, Reception)
   Structure that js/page.js will build:
   .fpage  (has CSS vars: --zone-top --zone-bottom --zone-color --zone-color2 --zone-align)
     .fpage__scene            full-screen background image
     .fpage__fx               effects layer (petals, stars, beams, glow, lamps)
     .fpage__layers           parallax pieces
        .piece                (parallax wrapper: sets --depth, JS sets --px/--py)
          .piece__img         (loop animation lives here: .anim-sway / -swing / -float / -flicker / -bob)
     .fpage__procession       walking procession (Reception only)
     .fpage__text             text zone
        .fpage__label  .fpage__heading  .fpage__date  .fpage__time
        .fpage__venue  .fpage__actions
     .fpage__nav              Back / Previous / Next
   ============================================================ */

.fpage {
  --zone-top: 8%;
  --zone-bottom: 35%;
  --zone-color: var(--maroon);
  --zone-color2: var(--maroon);
  --zone-align: center;
  --px: 0;                      /* parallax offsets, set by JS (-1 to 1) */
  --py: 0;

  position: relative;
  width: 100%;
  min-height: 100vh;
  min-height: 100dvh;
  overflow: hidden;
  background: var(--maroon-deep);
  isolation: isolate;
}

/* ---------- scene background ---------- */
.fpage__scene {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  z-index: 0;
  transform: translate3d(calc(var(--px) * -4px), calc(var(--py) * -4px), 0) scale(1.04);  /* slowest layer */
  transition: transform .25s ease-out;
}

/* ---------- effects layer ---------- */
.fpage__fx {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  overflow: hidden;
}

/* warm sun glow (Haldi) */
.fx-glow {
  position: absolute;
  top: -12%; left: 50%;
  width: 130%; height: 60%;
  transform: translateX(-50%);
  background: radial-gradient(ellipse at 50% 30%, rgba(255, 214, 120, .55), rgba(255, 190, 80, 0) 65%);
  animation: fxGlow 6s ease-in-out infinite;
  mix-blend-mode: screen;
}
@keyframes fxGlow { 0%, 100% { opacity: .6; } 50% { opacity: 1; } }

/* falling marigold petals (JS sets left, size, duration, delay) */
.fx-petal {
  position: absolute;
  top: -8%;
  width: var(--s, 12px);
  height: calc(var(--s, 12px) * 1.4);
  border-radius: 60% 40% 60% 40%;
  background: radial-gradient(circle at 30% 30%, #ffd45a, #f4a623 70%, #d97a0b);
  opacity: .9;
  animation: fxFall var(--d, 9s) linear var(--delay, 0s) infinite;
}
@keyframes fxFall {
  0%   { transform: translate3d(0, 0, 0) rotate(0deg); opacity: 0; }
  10%  { opacity: .95; }
  50%  { transform: translate3d(var(--sway, 24px), 55vh, 0) rotate(180deg); }
  100% { transform: translate3d(calc(var(--sway, 24px) * -1), 112vh, 0) rotate(360deg); opacity: .6; }
}

/* twinkling stars (Sangeet) */
.fx-star {
  position: absolute;
  width: var(--s, 3px);
  height: var(--s, 3px);
  border-radius: 50%;
  background: #fff8dc;
  box-shadow: 0 0 6px 2px rgba(255, 240, 180, .8);
  animation: fxTwinkle var(--d, 3s) ease-in-out var(--delay, 0s) infinite;
}
@keyframes fxTwinkle { 0%, 100% { opacity: .15; transform: scale(.7); } 50% { opacity: 1; transform: scale(1.3); } }

/* moving light beams (Sangeet) */
.fx-beam {
  position: absolute;
  top: -10%;
  width: 34%; height: 85%;
  background: linear-gradient(180deg, rgba(255, 230, 150, .5), rgba(255, 230, 150, 0) 85%);
  clip-path: polygon(46% 0, 54% 0, 100% 100%, 0 100%);
  mix-blend-mode: screen;
  transform-origin: 50% 0;
  filter: blur(2px);
}
.fx-beam--a { left: -4%;  animation: fxBeamA 7s ease-in-out infinite; }
.fx-beam--b { right: -4%; animation: fxBeamB 8.5s ease-in-out infinite; }
@keyframes fxBeamA { 0%, 100% { transform: rotate(-16deg); opacity: .55; } 50% { transform: rotate(14deg); opacity: .95; } }
@keyframes fxBeamB { 0%, 100% { transform: rotate(16deg); opacity: .55; } 50% { transform: rotate(-14deg); opacity: .95; } }

/* flickering lamps (Reception) */
.fx-lamp {
  position: absolute;
  width: var(--s, 26px);
  height: var(--s, 26px);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 220, 140, .95) 0%, rgba(255, 170, 60, .45) 40%, rgba(255, 150, 40, 0) 70%);
  mix-blend-mode: screen;
  animation: fxFlicker var(--d, 2.2s) ease-in-out var(--delay, 0s) infinite;
}
@keyframes fxFlicker {
  0%, 100% { opacity: .95; transform: scale(1); }
  20% { opacity: .55; transform: scale(.88); }
  45% { opacity: 1; transform: scale(1.1); }
  70% { opacity: .65; transform: scale(.94); }
}

/* ---------- parallax pieces ---------- */
.fpage__layers {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
}
/* JS sets: left, top, width as inline styles, and --depth (0.2 far to 1.4 near) */
.piece {
  position: absolute;
  transform: translate3d(calc(var(--px) * var(--depth, .6) * 14px), calc(var(--py) * var(--depth, .6) * 10px), 0);
  transition: transform .25s ease-out;
  will-change: transform;
}
.piece__img { width: 100%; height: auto; display: block; transform-origin: 50% 0; }

/* loop animations (JS adds one class to .piece__img) */
.anim-sway     { animation: pSway 6s ease-in-out infinite; }                     /* garlands */
.anim-swing    { animation: pSwing 4.2s ease-in-out infinite; }                  /* bells */
.anim-puppet   { animation: pPuppet 3.4s ease-in-out infinite; }                 /* puppets */
.anim-float    { animation: pFloat 5s ease-in-out infinite; transform-origin: 50% 50%; }
.anim-flicker  { animation: fxFlicker 2.4s ease-in-out infinite; transform-origin: 50% 50%; }
.anim-bob      { animation: pBob 2.6s ease-in-out infinite; transform-origin: 50% 100%; }
@keyframes pSway   { 0%, 100% { transform: rotate(-2.2deg); } 50% { transform: rotate(2.2deg); } }
@keyframes pSwing  { 0%, 100% { transform: rotate(-6deg); } 50% { transform: rotate(6deg); } }
@keyframes pPuppet { 0%, 100% { transform: rotate(-4deg) translateY(0); } 35% { transform: rotate(3deg) translateY(-5px); } 70% { transform: rotate(-2deg) translateY(2px); } }
@keyframes pFloat  { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-9px); } }
@keyframes pBob    { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-5px); } }

/* ---------- procession (Reception) ---------- */
.fpage__procession {
  position: absolute;
  left: 0;
  bottom: 9%;
  width: 118%;
  z-index: 2;
  pointer-events: none;
  animation: procWalk 48s linear infinite alternate;
}
.fpage__procession img {
  width: 100%;
  height: auto;
  animation: procBob 1.1s ease-in-out infinite;
}
@keyframes procWalk { from { transform: translateX(-24%); } to { transform: translateX(6%); } }
@keyframes procBob  { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-3px); } }

/* ---------- text zone (position comes from content.js textZone) ---------- */
.fpage__text {
  position: absolute;
  left: 0;
  right: 0;
  top: var(--zone-top);
  height: calc(var(--zone-bottom) - var(--zone-top));
  z-index: 4;
  padding: 0 8%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  color: var(--zone-color);
  overflow: visible;
}
.fpage--left .fpage__text { align-items: flex-start; text-align: left; padding-right: 30%; }

.fpage__label {
  font-family: var(--font-label);
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .34em;
  text-transform: uppercase;
  color: var(--zone-color);
  opacity: .9;
  margin-bottom: .5rem;
}
.fpage__heading {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: clamp(1.9rem, 8.4vw, 2.7rem);
  line-height: 1.12;
  margin: 0 0 .7rem;
  color: var(--zone-color);
}
.fpage__date,
.fpage__time {
  margin: 0;
  font-size: 1.22rem;
  font-weight: 600;
  letter-spacing: .03em;
  color: var(--zone-color2);
}
.fpage__time { font-family: var(--font-label); font-size: .95rem; letter-spacing: .14em; margin-top: .15rem; }
.fpage__venue {
  margin: .9rem 0 0;
  font-size: 1.08rem;
  font-style: italic;
  color: var(--zone-color2);
}
.fpage__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 1rem;
  pointer-events: auto;
}
.fpage--left .fpage__actions { justify-content: flex-start; }
.fpage__actions .btn { min-height: 42px; padding: .6em 1.2em; font-size: .7rem; }

/* soft light pad behind dark text, switched on with .fpage--pad when needed */
.fpage--pad .fpage__text::before {
  content: '';
  position: absolute;
  inset: -4% 2%;
  z-index: -1;
  border-radius: 40px;
  background: radial-gradient(ellipse at center, rgba(251, 239, 217, .55), rgba(251, 239, 217, 0) 70%);
}

/* ---------- bottom navigation ---------- */
.fpage__nav {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 6;
  padding: 16px 14px calc(14px + var(--safe-bottom));
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-areas: "prev next" "back back";
  gap: 8px;
  background: linear-gradient(180deg, rgba(40, 6, 16, 0), rgba(40, 6, 16, .82) 55%);
}
.fpage__nav .btn { min-height: 44px; font-size: .68rem; padding: .6em .8em; }
.fpage__nav .nav-prev { grid-area: prev; }
.fpage__nav .nav-next { grid-area: next; }
.fpage__nav .nav-back { grid-area: back; }
.fpage__nav .btn[hidden] { display: inline-flex !important; visibility: hidden; }   /* keep layout when no prev or next */

/* ---------- entrance of the text (JS adds .is-in) ---------- */
.fpage__text > * { opacity: 0; transform: translateY(18px); transition: opacity .8s var(--ease), transform .8s var(--ease); }
.fpage.is-in .fpage__text > * { opacity: 1; transform: none; }
.fpage.is-in .fpage__text > *:nth-child(2) { transition-delay: .12s; }
.fpage.is-in .fpage__text > *:nth-child(3) { transition-delay: .24s; }
.fpage.is-in .fpage__text > *:nth-child(4) { transition-delay: .36s; }
.fpage.is-in .fpage__text > *:nth-child(5) { transition-delay: .48s; }
.fpage.is-in .fpage__text > *:nth-child(6) { transition-delay: .6s; }

/* ---------- desktop: scene stays inside the 480px column (already handled by #app) ---------- */

/* ---------- reduced motion: still, simple ---------- */
@media (prefers-reduced-motion: reduce) {
  .fx-petal, .fx-star, .fx-beam, .fx-lamp, .fx-glow { animation: none !important; }
  .fx-star, .fx-lamp { opacity: .8; }
  .fx-petal { display: none; }
  .piece__img, .fpage__procession, .fpage__procession img { animation: none !important; }
  .fpage__procession { transform: translateX(-8%); }
  .fpage__scene, .piece { transform: none !important; transition: none; }
  .fpage__text > * { opacity: 1; transform: none; transition: none; }
}