/*
  MJ Envelope Intro (Premium)
  - Namespaced styles (mj-*) to avoid collisions.
  - Uses CSS-only paper mockup + a real seal image (assets/img/mj-seal.webp).
*/

/* Lock scroll while intro is visible */
html.mj-lock-scroll,
body.mj-lock-scroll{
  overflow: hidden !important;
  overscroll-behavior: none;
}

.mj-intro{
  /* Theme variables (scoped) */
  --mj-bg1: #83955b;
  --mj-bg2: #7a8365;
  --mj-paper1: #323a01;
  --mj-paper2: #2b3d02;
  --mj-ink: #2f2f2f;
  --mj-muted: rgba(47,47,47,.72);
  --mj-shadow: rgba(0,0,0,.16);
  --mj-radius: 22px;

  position: fixed;
  inset: 0;
  z-index: 99999;

  display: grid;
  place-items: center;
  padding:
    calc(22px + env(safe-area-inset-top))
    calc(16px + env(safe-area-inset-right))
    calc(22px + env(safe-area-inset-bottom))
    calc(16px + env(safe-area-inset-left));

  /* Beige studio background */
  background:
    radial-gradient(1200px 780px at 50% 18%, rgba(255,255,255,.72), transparent 58%),
    radial-gradient(900px 700px at 15% 85%, rgba(0,0,0,.045), transparent 62%),
    linear-gradient(180deg, var(--mj-bg1), var(--mj-bg2));

  opacity: 1;
  transition: opacity .45s ease;
}

.mj-intro.mj-intro--revealing{
  opacity: 0;
  pointer-events: none;
}

.mj-intro__wrap{
  width: min(980px, 100%);
  display: grid;
  justify-items: center;
  gap: clamp(10px, 2.2vw, 16px);
}

.mj-intro__title{
  margin: 0;
  text-align: center;
  color: var(--mj-ink);

  font-family: "Great Vibes", "Brush Script MT", "Segoe Script", cursive;
  font-weight: 400;
  font-size: clamp(44px, 6.4vw, 92px);
  line-height: 1;
  letter-spacing: .4px;
  text-shadow: 0 1px 0 rgba(255,255,255,.55);
}

.mj-intro__subtitle{
  margin: 0;
  text-align: center;
  color: var(--mj-muted);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  font-size: clamp(13px, 1.6vw, 16px);
  letter-spacing: .2px;
}

/* =========================================================
   ENVELOPE
   Layers: base paper, pocket, side folds, top flap, highlights.
========================================================= */

.mj-envelope{
  /* Geometry tuning (matches ref composition) */
  --mj-foldY: 56%;     /* horizontal fold line position */
  --mj-tipY: 80%;      /* bottom pocket tip */
  --mj-centerY: 56%;   /* seal center (same as fold line) */

  width: min(620px, 88vw, calc(74svh * 0.75));
  aspect-ratio: 3 / 4;
  position: relative;
  border-radius: clamp(18px, 2vw, 26px);
  transform: translateZ(0);
  perspective: 1100px;
  filter: drop-shadow(0 34px 56px var(--mj-shadow));
}

@media (max-width: 520px){
  .mj-envelope{
    width: min(92vw, 440px, calc(70svh * 0.75));
    filter: drop-shadow(0 26px 44px rgba(0,0,0,.14));
  }
}

/* Base paper */
.mj-envelope__base{
  position: absolute;

  position: relative;
  isolation: isolate;
  inset: 0;
  border-radius: inherit;

  /* Subtle paper texture (no visible grid) */
  background:
    radial-gradient(900px 700px at 40% 18%, rgba(255,255,255,.85), transparent 58%),
    radial-gradient(900px 760px at 70% 86%, rgba(0,0,0,.05), transparent 60%),
    repeating-linear-gradient(0deg,
      rgba(0,0,0,.010) 0px,
      rgba(0,0,0,.010) 1px,
      rgba(255,255,255,0) 6px,
      rgba(255,255,255,0) 10px),
    repeating-linear-gradient(90deg,
      rgba(0,0,0,.008) 0px,
      rgba(0,0,0,.008) 1px,
      rgba(255,255,255,0) 7px,
      rgba(255,255,255,0) 14px),
    linear-gradient(180deg, var(--mj-paper1), var(--mj-paper2));

  border: 1px solid rgba(0,0,0,.075);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,.7),
    inset 0 -1px 0 rgba(0,0,0,.06);
}

/* Inner soft vignette like photo */
.mj-envelope__base::after{
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background:
    radial-gradient(900px 900px at 50% 45%, rgba(0,0,0,.05), transparent 62%),
    radial-gradient(1200px 900px at 50% -10%, rgba(255,255,255,.55), transparent 55%);
  opacity: .35;
  pointer-events: none;
}

/* Bottom pocket */
.mj-envelope__pocket{
  position: absolute;
  inset: 0;
  border-radius: inherit;
  clip-path: polygon(0 var(--mj-foldY), 50% var(--mj-tipY), 100% var(--mj-foldY), 100% 100%, 0 100%);
  background:
    radial-gradient(900px 700px at 50% 0%, rgba(255,255,255,.52), transparent 58%),
    linear-gradient(180deg, rgba(0,0,0,.01), rgba(0,0,0,.06));
  opacity: .58;
  pointer-events: none;
}

/* Side folds */
.mj-envelope__side{
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  opacity: .46;
}

.mj-envelope__side--l{
  clip-path: polygon(0 var(--mj-foldY), 50% var(--mj-centerY), 0 100%);
  background:
    linear-gradient(135deg, rgba(255,255,255,.60), rgba(0,0,0,.05));
}

.mj-envelope__side--r{
  clip-path: polygon(100% var(--mj-foldY), 50% var(--mj-centerY), 100% 100%);
  background:
    linear-gradient(225deg, rgba(255,255,255,.58), rgba(0,0,0,.055));
}

/* Top flap (closed) - with curved corners via mask */
.mj-envelope__flap{
  position: absolute;
  inset: 0;
  border-radius: inherit;

  transform-origin: 50% 0%;
  transform-style: preserve-3d;
  transform: rotateX(0deg);
  transition: transform .95s cubic-bezier(.18,.95,.22,1);
  pointer-events: none;
}

.mj-envelope__flap::before{
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;

  /* Curved-top triangle mask */
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20100%2070'%3E%3Cpath%20d='M10%200%20H90%20Q98%200%2098%208%20V8%20L50%2046%20L2%208%20V8%20Q2%200%2010%200Z'%20fill='black'/%3E%3C/svg%3E");
  mask-image: url("data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20100%2070'%3E%3Cpath%20d='M10%200%20H90%20Q98%200%2098%208%20V8%20L50%2046%20L2%208%20V8%20Q2%200%2010%200Z'%20fill='black'/%3E%3C/svg%3E");
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  -webkit-mask-position: center top;
  mask-position: center top;
  -webkit-mask-size: 100% 62%;
  mask-size: 100% 62%;

  background:
    radial-gradient(900px 640px at 50% 120%, rgba(255,255,255,.72), transparent 58%),
    linear-gradient(180deg, rgba(0,0,0,.02), rgba(0,0,0,.06));

  /* shadow under flap like photo */
  filter: drop-shadow(0 10px 18px rgba(0,0,0,.09));
  opacity: .86;
}

/* Subtle crease shadows (very soft, not liney) */
.mj-envelope__creases{
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  opacity: .55;

  background:
    /* horizontal fold (soft band) */
    linear-gradient(to bottom,
      transparent calc(var(--mj-foldY) - 2px),
      rgba(0,0,0,.075) var(--mj-foldY),
      transparent calc(var(--mj-foldY) + 2px)
    ),

    /* diagonal shading (left) */
    linear-gradient(28deg,
      transparent 47%,
      rgba(0,0,0,.045) 50%,
      transparent 53%
    ),

    /* diagonal shading (right) */
    linear-gradient(-28deg,
      transparent 47%,
      rgba(0,0,0,.045) 50%,
      transparent 53%
    );

  mix-blend-mode: multiply;
}

/* Letter (hidden until opening) */
.mj-envelope__letter{
  position: absolute;
  left: 10%;
  right: 10%;
  top: 16%;
  height: 68%;
  border-radius: calc(var(--mj-radius) - 6px);

  background:
    radial-gradient(900px 600px at 50% 10%, rgba(255,255,255,.85), transparent 60%),
    linear-gradient(180deg, #ffffff, #f5f1ea);
  border: 1px solid rgba(0,0,0,.06);
  box-shadow: 0 18px 34px rgba(0,0,0,.12);

  transform: translateY(18%);
  opacity: 0;

  transition:
    transform .95s cubic-bezier(.18,.95,.22,1),
    opacity .55s ease;

  pointer-events: none;
  z-index: 1;
}

/* Seal button (uses real image) */
.mj-seal-btn{
  position: absolute;
  left: 50%;
  top: var(--mj-centerY);
  transform: translate(-50%, -50%);
  width: clamp(92px, 14vw, 132px);
  height: clamp(92px, 14vw, 132px);

  border: 0;
  padding: 0;
  border-radius: 999px;
  cursor: pointer;

  /* image from your reference */
  background-image: url("../images/init/mj-seal.png");
  background-repeat: no-repeat;
  background-position: 50% 52%;
  background-size: 115%;

  /* keep it crisp and add subtle extra depth */
  box-shadow:
    0 22px 34px rgba(0,0,0,.20);

  transition: transform .18s ease, filter .18s ease;
  animation: mj-sealPulse 1.45s ease-in-out infinite;

  z-index: 4;
}

.mj-seal-btn:focus-visible{
  outline: 3px solid rgba(134,137,93,.45);
  outline-offset: 6px;
}



/* Subtle gloss + rim (adds realism without changing the photo seal) */
.mj-seal-btn::before{
  content: "";
  position: absolute;
  inset: 10%;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,.22);
  box-shadow: inset 0 10px 18px rgba(0,0,0,.12);
  opacity: .55;
  pointer-events: none;
}

.mj-seal-btn::after{
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 999px;
  background:
    radial-gradient(120px 90px at 30% 25%, rgba(255,255,255,.55), transparent 55%),
    radial-gradient(160px 140px at 70% 85%, rgba(0,0,0,.18), transparent 60%);
  opacity: .28;
  mix-blend-mode: soft-light;
  pointer-events: none;
}
@media (hover:hover) and (pointer:fine){
  .mj-seal-btn:hover{
    transform: translate(-50%, -50%) scale(1.03);
    filter: brightness(1.01);
  }
}

/* small screen: slightly smaller seal to match photo */
@media (max-width: 380px){
  .mj-seal-btn{
    width: clamp(86px, 22vw, 118px);
    height: clamp(86px, 22vw, 118px);
    background-size: 142%;
  }
}

@keyframes mj-sealPulse{
  0%{ transform: translate(-50%, -50%) scale(1); }
  50%{ transform: translate(-50%, -50%) scale(1.04); }
  100%{ transform: translate(-50%, -50%) scale(1); }
}

/* Opening animation state */
.mj-intro.mj-intro--opening .mj-envelope__flap{
  transform: rotateX(155deg) translateY(-1px);
}

.mj-intro.mj-intro--opening .mj-envelope__letter{
  opacity: 1;
  transform: translateY(-6%);
}

.mj-intro.mj-intro--opening .mj-seal-btn{
  animation: none;
  transform: translate(-50%, -50%) scale(.98);
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce){
  .mj-intro{ transition: none; }
  .mj-envelope__flap,
  .mj-envelope__letter,
  .mj-seal-btn{ transition: none; animation: none; }
}