:root{
  --bg1:#fbf7f2;
  --bg2:#f6eef3;
  --ink:#1d1a19;
  --muted:#6d6460;
  --card:rgba(255,255,255,.62);
  --stroke:rgba(29,26,25,.12);
  --shadow: 0 18px 50px rgba(29,26,25,.10);
  --shadow2: 0 10px 30px rgba(29,26,25,.08);

  --r: 22px;
  --font-sans: "Inter", system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  --font-serif: "Playfair Display", Georgia, serif;
}

*{ box-sizing:border-box; }
html{ -webkit-tap-highlight-color: transparent; }
html,body{ height:100%; }
body{
  margin:0;
  color:var(--ink);
  font-family:var(--font-sans);
  overflow-x:hidden;
  -webkit-font-smoothing: antialiased;
  background: radial-gradient(1200px 700px at 15% 10%, var(--bg2), transparent 60%),
              radial-gradient(900px 600px at 85% 15%, #f3f6ff, transparent 55%),
              radial-gradient(1100px 700px at 60% 95%, #f2fff8, transparent 55%),
              linear-gradient(135deg, var(--bg1), #ffffff);
}

#bg{
  position:fixed;
  inset:0;
  width:100%;
  height:100%;
  z-index:0;
  pointer-events:none;
  opacity:.65;
}

.wrap{
  position:relative;
  z-index:1;
  max-width: 720px;
  margin: 0 auto;
  padding: 18px 16px 42px;
  min-height: 100%;
  display:flex;
  flex-direction:column;
  gap:14px;
}

.topbar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding: 8px 4px;
}

.brand{
  font-family:var(--font-serif);
  font-weight:600;
  letter-spacing:.5px;
  opacity:.85;
}

.card{
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  background: var(--card);
  border: 1px solid var(--stroke);
  border-radius: var(--r);
  box-shadow: var(--shadow);
  overflow:hidden;
}

.card__inner{
  padding: 22px 18px;
}

.title{
  font-family:var(--font-serif);
  font-weight:600;
  font-size: 30px;
  line-height:1.05;
  margin: 0 0 10px;
}
.subtitle{
  margin: 0 0 18px;
  color: var(--muted);
  line-height:1.4;
}

.hint{
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 13px;
}
.mono{
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  padding: 2px 6px;
  border: 1px solid var(--stroke);
  border-radius: 10px;
  background: rgba(255,255,255,.45);
}

.screen{ display:none; }
.screen--active{ display:block; animation: pop .45s ease both; }

@keyframes pop{
  from{ opacity:0; transform: translateY(10px); }
  to{ opacity:1; transform: translateY(0); }
}

.actions{
  display:flex;
  gap:10px;
  flex-wrap:wrap;
  margin-top: 12px;
}

.btn{
  border: 1px solid var(--stroke);
  background: rgba(255,255,255,.55);
  color: var(--ink);
  border-radius: 999px;
  padding: 10px 14px;
  font-weight: 600;
  cursor:pointer;
  transition: transform .12s ease, box-shadow .12s ease, background .12s ease;
  box-shadow: var(--shadow2);
}
.btn:active{ transform: translateY(1px) scale(.99); }
.btn:hover{ background: rgba(255,255,255,.72); }
.btn:focus-visible{
  outline: 3px solid rgba(50, 90, 255, .18);
  outline-offset: 2px;
}

.btn--primary{
  background: rgba(29,26,25,.92);
  color: white;
  border-color: rgba(29,26,25,.12);
}
.btn--primary:hover{ background: rgba(29,26,25,.98); }

.btn--ghost{
  background: transparent;
  box-shadow:none;
}

.chip{
  border: 1px solid var(--stroke);
  background: rgba(255,255,255,.55);
  color: var(--ink);
  border-radius: 999px;
  padding: 8px 12px;
  font-weight: 600;
  cursor:pointer;
  transition: background .12s ease, transform .12s ease;
}
.chip:hover{ background: rgba(255,255,255,.72); }
.chip:active{ transform: translateY(1px); }
.chip:focus-visible{
  outline: 3px solid rgba(50, 90, 255, .18);
  outline-offset: 2px;
}

.envelope{
  position:relative;
  width: min(420px, 92%);
  aspect-ratio: 16/10;
  margin: 10px auto 6px;
  cursor:pointer;
  user-select:none;
  transform: translateZ(0);
  perspective: 800px;
  transform-style: preserve-3d;
}
.envelope__shadow{
  position:absolute;
  inset: 10% 6% 6% 6%;
  border-radius: 18px;
  background: radial-gradient(60% 70% at 50% 70%, rgba(29,26,25,.18), transparent 70%);
  filter: blur(10px);
  opacity:.5;
  transform: translateY(20px);
}

.envelope__back{
  position:absolute;
  inset: 14% 8% 14% 8%;
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(255,255,255,.85), rgba(255,255,255,.55));
  border: 1px solid rgba(29,26,25,.10);
}

.envelope__paper{
  position:absolute;
  left: 12%;
  right: 12%;
  top: 10%;
  height: 65%;
  border-radius: 16px;
  background: rgba(255,255,255,.9);
  border: 1px solid rgba(29,26,25,.10);
  transform: translateY(28%);
  transition: transform .55s ease;
  display:flex;
  flex-direction:column;
  gap:10px;
  padding: 16px;
}
.paper__line{
  height: 10px;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(29,26,25,.12), rgba(29,26,25,.04));
}

.envelope__front{
  position:absolute;
  inset: 14% 8% 14% 8%;
  border-radius: 18px;
  background:
    linear-gradient(135deg, rgba(255,255,255,.72), rgba(255,255,255,.35));
  border: 1px solid rgba(29,26,25,.10);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
}

.envelope__flap{
  position:absolute;
  left:8%;
  right:8%;
  top:14%;
  height: 46%;
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(255,255,255,.82), rgba(255,255,255,.44));
  border: 1px solid rgba(29,26,25,.10);
  transform-origin: top center;
  transform: rotateX(0deg);
  transition: transform .55s cubic-bezier(0.33, 1, 0.68, 1);
  clip-path: polygon(0 0, 100% 0, 50% 90%);
  backface-visibility: hidden;
}

.seal{
  position:absolute;
  left:50%;
  top:58%;
  transform: translate(-50%, -50%);
  width: 46px;
  height: 46px;
  border-radius: 999px;
  background: rgba(29,26,25,.92);
  color:#fff;
  display:grid;
  place-items:center;
  font-weight:700;
  box-shadow: var(--shadow2);
  border: 1px solid rgba(255,255,255,.18);
  transition: transform .55s ease;
}

.envelope:hover .seal{ transform: translate(-50%,-50%) scale(1.03); }
.envelope.open .envelope__flap{ transform: rotateX(165deg); }
.envelope.open .envelope__paper{ transform: translateY(-6%); }
.envelope.open .seal{ transform: translate(-50%,-50%) scale(.96); opacity:.95; }

.letterHead{
  display:flex;
  flex-direction:column;
  gap:10px;
  margin-bottom: 14px;
}
.letterTitle{
  font-family:var(--font-serif);
  font-size: 26px;
  margin:0;
}
.letterLead{
  margin:0;
  color: var(--muted);
  line-height:1.45;
}

.letterButtons{
  display:flex;
  gap:10px;
  flex-wrap:wrap;
}

.grid{
  display:grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

@media (max-width: 374px){
  .card__inner{ padding: 18px 14px; }
  .title{ font-size: 26px; }
  .grid{ gap: 8px; }
  .wish{ min-height: 80px; padding: 10px; }
}

@media (min-width: 720px){
  .card__inner{ padding: 26px 26px; }
  .title{ font-size: 34px; }
  .grid{ grid-template-columns: repeat(3, minmax(0,1fr)); }
}

.wish{
  position:relative;
  border-radius: 18px;
  border: 1px solid var(--stroke);
  background: rgba(255,255,255,.60);
  padding: 12px 12px;
  min-height: 88px;
  cursor:pointer;
  box-shadow: var(--shadow2);
  transition: transform .12s ease, background .12s ease;
  display:flex;
  flex-direction:column;
  gap:8px;
}
.wish:hover{ background: rgba(255,255,255,.74); }
.wish:active{ transform: translateY(1px) scale(.995); }
.wish:focus-visible{
  outline: 3px solid rgba(50, 90, 255, .18);
  outline-offset: 2px;
}

.wish__tag{
  font-size:12px;
  color: var(--muted);
  letter-spacing:.2px;
}
.wish__text{
  font-weight:600;
  line-height:1.25;
}
.wish__locked{
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 12px;
  color: rgba(29,26,25,.60);
  border: 1px dashed rgba(29,26,25,.18);
  border-radius: 999px;
  padding: 4px 8px;
  width: fit-content;
}

.wish.open .wish__locked{ display:none; }
.wish:not(.open) .wish__text{ display:none; }

.final{
  margin-top: 14px;
  border-top: 1px solid rgba(29,26,25,.10);
  padding-top: 14px;
  animation: fadeIn .4s ease both;
}
@keyframes fadeIn{
  from{ opacity: 0; transform: translateY(8px); }
  to{ opacity: 1; transform: translateY(0); }
}
.final__title{
  font-family: var(--font-serif);
  margin: 0 0 8px;
  font-size: 20px;
}
.final__text{
  margin:0 0 14px;
  color: rgba(29,26,25,.92);
  line-height:1.55;
}
.final__footer{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  flex-wrap:wrap;
}
.sig{
  color: rgba(29,26,25,.70);
  font-weight:600;
}

.footer{
  margin-top: 14px;
  color: var(--muted);
  font-size: 13px;
}
.muted{ opacity:.8; }

.toast{
  position: fixed;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%);
  background: rgba(29,26,25,.92);
  color: #fff;
  padding: 10px 14px;
  border-radius: 999px;
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events:none;
  transition: opacity .18s ease, transform .18s ease;
  z-index: 10;
  font-weight:600;
  font-size: 14px;
}
.toast.show{
  opacity: 1;
  transform: translateX(-50%) translateY(-2px);
}