/* =====================
   Base & Reset
   ===================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg:        #1a0a2e;
  --bg2:       #2b1152;
  --gold:      #f0c040;
  --gold-dark: #b8882a;
  --card-bg:   #fff8f0;
  --card-red:  #c0392b;
  --card-black:#1a1a2e;
  --text-dark: #1a1a2e;
  --text-light:#fff8f0;
  --accent:    #9b59b6;
  --radius:    16px;
}

html, body {
  height: 100%;
  font-family: 'Georgia', serif;
  background: var(--bg);
  color: var(--text-light);
  overflow: hidden;
}

/* Star background */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    radial-gradient(1px 1px at 10% 20%, rgba(255,255,255,.7) 0%, transparent 100%),
    radial-gradient(1px 1px at 30% 60%, rgba(255,255,255,.5) 0%, transparent 100%),
    radial-gradient(1px 1px at 55% 15%, rgba(255,255,255,.8) 0%, transparent 100%),
    radial-gradient(1px 1px at 70% 40%, rgba(255,255,255,.4) 0%, transparent 100%),
    radial-gradient(1px 1px at 85% 75%, rgba(255,255,255,.6) 0%, transparent 100%),
    radial-gradient(1px 1px at 20% 85%, rgba(255,255,255,.5) 0%, transparent 100%),
    radial-gradient(1px 1px at 90% 10%, rgba(255,255,255,.7) 0%, transparent 100%),
    radial-gradient(1px 1px at 45% 50%, rgba(255,255,255,.3) 0%, transparent 100%);
  pointer-events: none;
  z-index: 0;
}

/* =====================
   Scene
   ===================== */
.scene {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
}

.hidden {
  display: none !important;
}

/* =====================
   Envelope
   ===================== */
.envelope-wrapper {
  cursor: pointer;
  perspective: 800px;
}

.envelope {
  width: 320px;
  position: relative;
  filter: drop-shadow(0 8px 32px rgba(0,0,0,.6));
  transition: transform .2s ease;
}

.envelope:hover {
  transform: scale(1.03);
}

.envelope-flap {
  width: 0;
  height: 0;
  border-left: 160px solid transparent;
  border-right: 160px solid transparent;
  border-top: 120px solid var(--gold);
  position: relative;
  z-index: 2;
  transition: transform .6s ease, opacity .4s ease;
  transform-origin: top center;
}

.envelope.open .envelope-flap {
  transform: rotateX(-180deg);
  opacity: 0;
}

.envelope-body {
  width: 320px;
  height: 220px;
  background: linear-gradient(160deg, var(--gold) 0%, var(--gold-dark) 100%);
  border-radius: 0 0 var(--radius) var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 1;
}

.envelope-body::before,
.envelope-body::after {
  content: '';
  position: absolute;
  bottom: 0;
  width: 0;
  height: 0;
}

.envelope-body::before {
  left: 0;
  border-bottom: 220px solid var(--bg2);
  border-right: 160px solid transparent;
  opacity: .15;
}

.envelope-body::after {
  right: 0;
  border-bottom: 220px solid var(--bg2);
  border-left: 160px solid transparent;
  opacity: .15;
}

.tap-hint {
  font-size: 1rem;
  color: var(--bg);
  opacity: .7;
  letter-spacing: .05em;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: .5; }
  50%       { opacity: 1; }
}

/* Envelope open animation */
.envelope-wrapper.opening {
  animation: envelopeShake .4s ease;
}

@keyframes envelopeShake {
  0%   { transform: rotate(0deg); }
  25%  { transform: rotate(-3deg); }
  50%  { transform: rotate(3deg); }
  75%  { transform: rotate(-2deg); }
  100% { transform: rotate(0deg); }
}

/* =====================
   Card
   ===================== */
.card-wrapper {
  perspective: 1200px;
  cursor: pointer;
}

.card {
  width: 300px;
  height: 460px;
  position: relative;
  transform-style: preserve-3d;
  transition: transform .7s cubic-bezier(.4, 0, .2, 1);
  filter: drop-shadow(0 12px 40px rgba(0,0,0,.7));
}

.card.flipped {
  transform: rotateY(180deg);
}

.card-front,
.card-back {
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

/* Front */
.card-front {
  background: var(--card-bg);
  display: grid;
  grid-template-rows: auto 1fr auto;
  grid-template-columns: auto 1fr auto;
  padding: 16px;
  color: var(--text-dark);
}

.card-corner {
  font-size: 1.6rem;
  line-height: 1;
  font-weight: bold;
  user-select: none;
}

.top-left  { grid-area: 1 / 1; color: var(--card-black); }
.top-right { grid-area: 1 / 3; color: var(--card-red);   }
.bottom-left  { grid-area: 3 / 1; color: var(--card-red);   transform: rotate(180deg); }
.bottom-right { grid-area: 3 / 3; color: var(--card-black); transform: rotate(180deg); }

.card-center {
  grid-area: 2 / 1 / 3 / 4;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 12px;
  text-align: center;
}

.card-title {
  font-size: 1.8rem;
  font-weight: bold;
  color: var(--card-black);
  letter-spacing: .04em;
}

.card-subtitle {
  font-size: .95rem;
  color: #555;
  font-style: italic;
  line-height: 1.5;
}

.card-sub2 {
  font-size: 1.1rem;
  font-weight: bold;
  color: var(--card-red);
}

.flip-hint {
  grid-area: 3 / 1 / 4 / 4;
  text-align: center;
  font-size: .8rem;
  color: #999;
  padding-top: 4px;
}

/* Back */
.card-back {
  background: linear-gradient(135deg, var(--bg2) 0%, var(--bg) 100%);
  border: 3px solid var(--gold);
  transform: rotateY(180deg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: 28px 20px 20px;
}

.puns-container {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.pun-text {
  font-size: 1.1rem;
  text-align: center;
  line-height: 1.7;
  color: var(--text-light);
  padding: 0 8px;
  animation: fadeIn .5s ease;
}

.pun-text em {
  color: var(--gold);
  font-style: normal;
}

.pun-number {
  font-size: .75rem;
  color: var(--gold-dark);
  margin-bottom: 8px;
  letter-spacing: .1em;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.next-btn {
  background: var(--gold);
  color: var(--bg);
  border: none;
  border-radius: 999px;
  padding: 10px 24px;
  font-size: .9rem;
  font-family: inherit;
  font-weight: bold;
  cursor: pointer;
  letter-spacing: .05em;
  transition: background .2s, transform .15s;
}

.next-btn:hover {
  background: #ffe070;
  transform: scale(1.04);
}

.next-btn:active {
  transform: scale(.97);
}

/* =====================
   Final message
   ===================== */
.final-message {
  text-align: center;
  padding: 32px 24px;
  max-width: 400px;
  animation: fadeIn .6s ease;
}

.final-emoji {
  font-size: 4rem;
  margin-bottom: 16px;
}

.final-title {
  font-size: 2rem;
  font-weight: bold;
  color: var(--gold);
  margin-bottom: 20px;
  letter-spacing: .04em;
}

.final-body {
  font-size: 1.05rem;
  line-height: 1.8;
  color: #ddd;
}

.final-body em {
  color: var(--gold);
  font-style: italic;
}

.final-suits {
  margin-top: 28px;
  font-size: 1.8rem;
  letter-spacing: .3em;
  color: var(--gold);
  animation: pulse 2.5s ease-in-out infinite;
}

/* =====================
   Responsive
   ===================== */
@media (max-width: 400px) {
  .envelope { width: 280px; }
  .envelope-flap {
    border-left-width: 140px;
    border-right-width: 140px;
  }
  .envelope-body { width: 280px; }
  .card { width: 260px; height: 400px; }
  .card-title { font-size: 1.4rem; }
}