:root {
  --bg0: #07060f;
  --bg1: #120a1a;
  --gold: #f0c75e;
  --gold-hot: #ffe9a0;
  --rose: #ff6b8a;
  --cyan: #6ef3ff;
  --violet: #b57bff;
  --ink: #f7f0e8;
  --muted: #cbb9a8;
  --card: #16101f;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --spring: cubic-bezier(0.34, 1.4, 0.64, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  height: 100%;
  min-height: 100%;
}

body {
  font-family: "Manrope", system-ui, sans-serif;
  color: var(--ink);
  background: radial-gradient(ellipse at 50% 0%, #2a1438 0%, var(--bg0) 55%);
  overflow-x: hidden;
  overflow-y: auto;
  -webkit-font-smoothing: antialiased;
}

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

#bolts {
  z-index: 1;
  mix-blend-mode: screen;
}

.aurora {
  position: fixed;
  inset: -20%;
  z-index: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(181, 123, 255, 0.22), transparent 42%),
    radial-gradient(circle at 80% 20%, rgba(110, 243, 255, 0.14), transparent 40%),
    radial-gradient(circle at 50% 80%, rgba(255, 107, 138, 0.16), transparent 45%);
  filter: blur(40px);
  animation: auroraShift 12s ease-in-out infinite alternate;
  pointer-events: none;
}

@keyframes auroraShift {
  from { transform: translate(-2%, -1%) scale(1); }
  to { transform: translate(3%, 2%) scale(1.08); }
}

.stage {
  position: relative;
  z-index: 2;
  min-height: 100dvh;
  width: 100%;
}

/* ——— INTRO ——— */
.stage-intro {
  display: grid;
  place-items: center;
  padding: 2rem 1.25rem 3rem;
  transition: opacity 0.7s var(--ease), transform 0.9s var(--ease), filter 0.7s ease;
}

.stage-intro.is-out {
  opacity: 0;
  transform: scale(1.08);
  filter: brightness(1.8);
  pointer-events: none;
}

.stage-intro.is-gone {
  display: none !important;
}

.intro-content {
  text-align: center;
  max-width: 720px;
  display: grid;
  gap: 0.85rem;
  justify-items: center;
  margin-bottom: 1.5rem;
}

.eyebrow {
  font-size: 0.72rem;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--gold);
  animation: rise 0.7s var(--ease) both;
}

.brand {
  font-family: "Great Vibes", cursive;
  font-weight: 400;
  font-size: clamp(4.2rem, 18vw, 7.5rem);
  line-height: 0.9;
  color: var(--gold-hot);
  background: linear-gradient(180deg, #fff 10%, var(--gold-hot) 45%, var(--rose) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 0 24px rgba(240, 199, 94, 0.45));
  animation: brandIn 0.9s var(--spring) 0.1s both;
}

.tagline {
  font-family: "Cinzel", serif;
  font-size: clamp(0.85rem, 2.4vw, 1.05rem);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  animation: rise 0.7s var(--ease) 0.2s both;
}

.open-btn {
  position: relative;
  margin-top: 1.1rem;
  border: 1px solid rgba(240, 199, 94, 0.55);
  background: linear-gradient(135deg, rgba(240, 199, 94, 0.18), rgba(255, 107, 138, 0.12));
  color: var(--gold-hot);
  font-family: "Cinzel", serif;
  font-size: 0.78rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  padding: 1rem 1.9rem;
  cursor: pointer;
  overflow: hidden;
  animation: rise 0.7s var(--ease) 0.35s both, pulseBtn 2.4s ease-in-out 1.2s infinite;
  transition: transform 0.3s var(--ease), box-shadow 0.3s ease;
  box-shadow: 0 0 0 0 rgba(240, 199, 94, 0.35);
}

.open-btn:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 0 40px rgba(240, 199, 94, 0.35);
}

.open-btn-glow {
  position: absolute;
  inset: -40%;
  background: conic-gradient(from 0deg, transparent, rgba(110, 243, 255, 0.35), transparent 30%);
  animation: spin 4s linear infinite;
  opacity: 0.55;
}

.open-btn-text {
  position: relative;
  z-index: 1;
}

@keyframes pulseBtn {
  0%, 100% { box-shadow: 0 0 0 0 rgba(240, 199, 94, 0.4); }
  50% { box-shadow: 0 0 28px 4px rgba(240, 199, 94, 0.25); }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes rise {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes brandIn {
  from { opacity: 0; transform: translateY(30px) scale(0.9); filter: blur(8px); }
  to { opacity: 1; transform: translateY(0) scale(1); filter: blur(0); }
}

/* Envelope 3D */
.envelope-3d {
  width: min(78vw, 280px);
  height: 180px;
  position: relative;
  perspective: 900px;
  transform-style: preserve-3d;
  margin-top: 0.5rem;
  animation: floatEnv 4s ease-in-out infinite;
  filter: drop-shadow(0 25px 40px rgba(0, 0, 0, 0.55));
  animation: floatEnv 4s ease-in-out infinite, rise 0.8s var(--ease) 0.45s both;
}

.env-face {
  position: absolute;
  inset: 0;
  border-radius: 6px;
  transform-style: preserve-3d;
}

.env-back {
  background: linear-gradient(145deg, #3a2438, #241624);
  border: 1px solid rgba(240, 199, 94, 0.25);
}

.env-front {
  background: linear-gradient(160deg, #4a2d44 0%, #2a1528 100%);
  border: 1px solid rgba(240, 199, 94, 0.35);
  display: grid;
  place-items: center;
  gap: 0.4rem;
  content-visibility: auto;
}

.env-flap {
  height: 55%;
  background: linear-gradient(180deg, #5a3550, #3a2038);
  clip-path: polygon(0 0, 100% 0, 50% 100%);
  transform-origin: top center;
  transition: transform 0.9s var(--ease);
  border-top: 1px solid rgba(240, 199, 94, 0.3);
}

.envelope-3d.is-open .env-flap {
  transform: rotateX(180deg);
}

.env-seal {
  width: 58px;
  height: 58px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-family: "Great Vibes", cursive;
  font-size: 1.8rem;
  color: #1a0e14;
  background: radial-gradient(circle at 35% 30%, var(--gold-hot), var(--gold) 55%, #a67c1a);
  box-shadow: 0 0 24px rgba(240, 199, 94, 0.55), inset 0 2px 4px rgba(255, 255, 255, 0.45);
  animation: sealPulse 2.2s ease-in-out infinite;
}

.env-label {
  font-family: "Cinzel", serif;
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  color: var(--gold-soft, var(--gold));
  color: var(--gold);
}

@keyframes floatEnv {
  0%, 100% { transform: translateY(0) rotateX(8deg) rotateY(-6deg); }
  50% { transform: translateY(-12px) rotateX(12deg) rotateY(6deg); }
}

@keyframes sealPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.06); }
}

/* ——— LETTER ——— */
.stage-letter {
  display: none;
  place-items: center;
  padding: 2.5rem 1rem 3.5rem;
  opacity: 0;
  transform: translateY(40px) scale(0.96);
  transition: opacity 0.9s var(--ease), transform 1s var(--ease);
}

.stage-letter.is-on {
  display: grid;
}

.stage-letter.is-show {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.scene-3d {
  perspective: 1400px;
  width: min(100%, 560px);
}

.card-3d {
  transform-style: preserve-3d;
  transform: rotateX(18deg) rotateY(-8deg) translateZ(-40px);
  transition: transform 1.2s var(--ease);
  will-change: transform;
}

.stage-letter.is-show .card-3d {
  transform: rotateX(0) rotateY(0) translateZ(0);
}

.card-3d.is-tilt {
  transition: transform 0.15s linear;
}

.card-inner {
  position: relative;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.06), transparent 30%),
    linear-gradient(145deg, #1e1528 0%, #120c1a 100%);
  border: 1px solid rgba(240, 199, 94, 0.35);
  padding: clamp(1.6rem, 4vw, 2.6rem);
  box-shadow:
    0 0 0 1px rgba(110, 243, 255, 0.08) inset,
    0 40px 100px rgba(0, 0, 0, 0.55),
    0 0 80px rgba(181, 123, 255, 0.12);
  overflow: hidden;
}

.card-inner::before {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(240, 199, 94, 0.18);
  pointer-events: none;
}

.card-inner::after {
  content: "";
  position: absolute;
  top: -40%;
  left: -30%;
  width: 60%;
  height: 80%;
  background: linear-gradient(120deg, transparent, rgba(110, 243, 255, 0.08), transparent);
  transform: rotate(25deg);
  pointer-events: none;
  animation: sheen 5s ease-in-out infinite;
}

@keyframes sheen {
  0%, 100% { transform: translateX(-20%) rotate(25deg); opacity: 0.2; }
  50% { transform: translateX(120%) rotate(25deg); opacity: 0.7; }
}

.card-head {
  text-align: center;
  margin-bottom: 1.4rem;
}

.card-date {
  font-size: 0.7rem;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 0.7rem;
}

.card-name {
  font-family: "Great Vibes", cursive;
  font-weight: 400;
  font-size: clamp(3.4rem, 13vw, 5.2rem);
  line-height: 0.95;
  background: linear-gradient(180deg, #fff, var(--gold-hot) 60%, var(--rose));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: none;
  filter: drop-shadow(0 0 18px rgba(240, 199, 94, 0.35));
}

.card-role {
  font-family: "Cinzel", serif;
  font-size: 0.85rem;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 0.25rem;
}

.divider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.7rem;
  margin-top: 1rem;
  color: var(--gold);
}

.divider i {
  display: block;
  width: 48px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
}

.divider span {
  animation: twinkle 1.8s ease-in-out infinite;
}

@keyframes twinkle {
  0%, 100% { opacity: 0.4; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.3); text-shadow: 0 0 12px var(--cyan); }
}

.card-body {
  display: grid;
  gap: 1rem;
  text-align: center;
  min-height: 220px;
}

.script-line {
  font-family: "Manrope", sans-serif;
  font-weight: 300;
  font-size: clamp(1rem, 2.5vw, 1.12rem);
  line-height: 1.7;
  color: var(--ink);
  min-height: 1.5em;
  opacity: 1;
}

.script-line.highlight {
  font-family: "Cinzel", serif;
  font-weight: 600;
  font-size: clamp(1.05rem, 2.6vw, 1.2rem);
  color: var(--gold-hot);
  line-height: 1.55;
  text-shadow: 0 0 20px rgba(240, 199, 94, 0.25);
}

.script-line.amen {
  font-family: "Great Vibes", cursive;
  font-size: clamp(2rem, 5vw, 2.6rem);
  color: var(--cyan);
  text-shadow: 0 0 24px rgba(110, 243, 255, 0.45);
}

.script-line .cursor {
  display: inline-block;
  width: 2px;
  height: 1.05em;
  background: var(--gold);
  margin-left: 2px;
  vertical-align: text-bottom;
  animation: blink 0.8s step-end infinite;
  box-shadow: 0 0 8px var(--gold);
}

@keyframes blink {
  50% { opacity: 0; }
}

.card-foot {
  margin-top: 1.8rem;
  display: grid;
  gap: 0.9rem;
  justify-items: center;
}

.power-btn {
  border: none;
  cursor: pointer;
  font-family: "Cinzel", serif;
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: #140a12;
  padding: 1rem 1.6rem;
  background: linear-gradient(135deg, var(--gold-hot), var(--gold) 40%, var(--rose));
  box-shadow: 0 0 30px rgba(240, 199, 94, 0.35), 0 12px 28px rgba(0, 0, 0, 0.35);
  transition: transform 0.3s var(--ease), filter 0.3s ease;
  position: relative;
  overflow: hidden;
}

.power-btn:hover {
  transform: translateY(-2px) scale(1.03);
  filter: brightness(1.08);
}

.power-btn:disabled {
  cursor: default;
  background: linear-gradient(135deg, var(--cyan), #3ec8ff);
  color: #041018;
}

.signed {
  font-family: "Great Vibes", cursive;
  font-size: 1.35rem;
  color: var(--muted);
}

.flash {
  position: fixed;
  inset: 0;
  z-index: 40;
  pointer-events: none;
  background: radial-gradient(circle at center, rgba(255, 255, 255, 0.85), rgba(110, 243, 255, 0.35) 30%, transparent 65%);
  opacity: 0;
}

.flash.is-on {
  animation: flashBang 0.7s var(--ease) forwards;
}

@keyframes flashBang {
  0% { opacity: 0.95; }
  100% { opacity: 0; }
}

@media (max-width: 520px) {
  .envelope-3d {
    height: 150px;
  }
  .card-inner {
    padding: 1.4rem 1.1rem;
  }
}