:root {
  --forest: #24402C;
  --deep-forest: #18362C;
  --muted: #7A6258;
  --paper: #FFF9EA;
  --peach: #FFE5C4;
  --orange-ink: #C13E21;
  --warm-line: #E8CBA7;
}

#intro.intro-card {
  position: relative;
  min-height: calc(100dvh - 48px);
  margin: 0 -20px 16px;
  padding: 28px 20px 32px;
  overflow: hidden;
  border-radius: 28px;
  background:
    radial-gradient(circle at 50% 38%, rgba(255, 201, 60, .28), transparent 30%),
    radial-gradient(circle at 8% 22%, rgba(255, 255, 255, .62), transparent 22%),
    linear-gradient(180deg, var(--paper) 0%, var(--cream) 58%, var(--peach) 100%);
  isolation: isolate;
}

#intro.intro-card::after {
  content: "";
  position: absolute;
  z-index: -1;
  pointer-events: none;
}

#intro.intro-card::after {
  width: 240px;
  height: 240px;
  right: -132px;
  top: 72px;
  border: 2px solid rgba(193, 62, 33, .12);
  border-radius: 50%;
  box-shadow: 0 0 0 24px rgba(193, 62, 33, .035), 0 0 0 48px rgba(193, 62, 33, .025);
}

.intro-heading {
  position: relative;
  z-index: 3;
}

.intro-label {
  display: inline-block;
  margin: 0 0 12px;
  padding: 4px 12px;
  border: 1px solid var(--warm-line);
  border-radius: 999px;
  color: var(--orange-ink);
  background: rgba(255, 255, 255, .7);
  font-size: 12px;
  font-weight: 800;
  line-height: 1.5;
  letter-spacing: .08em;
}

#intro h1 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(44px, 13vw, 60px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -.055em;
  text-wrap: balance;
  word-break: keep-all;
}

#intro h1 span,
#intro h1 strong {
  display: block;
}

#intro h1 strong {
  color: var(--flame);
  font-size: 1.14em;
  font-weight: 900;
  text-shadow: 0 4px 0 var(--yellow);
}

.intro-lead {
  max-width: 320px;
  margin: 16px auto 0;
  color: var(--muted);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  word-break: keep-all;
}

.intro-scene {
  position: relative;
  z-index: 2;
  height: 268px;
  margin: -4px -20px -10px;
}

.intro-scene::before {
  content: "";
  position: absolute;
  z-index: 0;
  inset: 40% -8% 0;
  background: linear-gradient(180deg, var(--forest), var(--deep-forest));
  clip-path: polygon(0 46%, 8% 30%, 17% 44%, 27% 18%, 38% 42%, 49% 12%, 60% 38%, 72% 18%, 83% 43%, 92% 28%, 100% 42%, 100% 100%, 0 100%);
}

.intro-scene img {
  position: absolute;
  z-index: 2;
  width: auto;
  max-width: none;
  object-fit: contain;
  filter: drop-shadow(0 10px 8px rgba(86, 42, 23, .18));
}

.intro-main {
  left: 50%;
  bottom: 16px;
  height: 216px;
  transform: translateX(-50%);
  z-index: 4 !important;
}

.intro-friend {
  bottom: 24px;
  height: 144px;
}

.intro-friend-left {
  left: 3%;
  transform: rotate(-9deg);
}

.intro-friend-right {
  right: 2%;
  transform: rotate(9deg);
}

.intro-glow {
  position: absolute;
  left: 50%;
  bottom: 20px;
  width: 260px;
  height: 196px;
  transform: translateX(-50%);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 201, 60, .62) 0, rgba(255, 201, 60, .18) 54%, transparent 72%);
}

.intro-ground {
  position: absolute;
  z-index: 1;
  left: 50%;
  bottom: 10px;
  width: 88%;
  height: 48px;
  transform: translateX(-50%);
  border-radius: 50%;
  background: rgba(24, 54, 44, .28);
  filter: blur(4px);
}

.intro-invite {
  position: relative;
  z-index: 4;
  margin: -18px 0 20px;
  padding: 16px 16px 12px;
  border: 2px solid rgba(255, 255, 255, .9);
  border-radius: 20px;
  background: rgba(255, 249, 234, .9);
  box-shadow: 0 10px 24px rgba(58, 42, 34, .12), inset 0 0 0 1px rgba(232, 203, 167, .7);
  backdrop-filter: blur(8px);
}

.intro-invite p {
  margin: 0;
  color: var(--ink);
  font-size: 15px;
  line-height: 1.6;
  word-break: keep-all;
}

.intro-invite strong {
  font-size: 17px;
}

.intro-meta {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 8px !important;
  color: var(--orange-ink) !important;
  font-size: 12px !important;
  font-weight: 800;
  letter-spacing: .06em;
}

#intro .intro-start {
  position: relative;
  z-index: 4;
  min-height: 64px;
  margin: 0;
  border: 2px solid var(--ink);
  border-radius: 999px;
  background: var(--flame);
  box-shadow: 0 6px 0 var(--deep-forest), 0 14px 24px rgba(58, 42, 34, .18);
  color: #FFFFFF;
  font-size: 20px;
  font-weight: 900;
  transition: transform 150ms ease-out, filter 150ms ease-out;
}

#intro .intro-start span {
  display: inline-block;
  margin-left: 8px;
  font-size: 24px;
  line-height: 1;
}

@media (hover: hover) {
  #intro .intro-start:hover {
    filter: brightness(1.06);
    transform: translateY(-2px);
  }
}

#intro .intro-start:active {
  transform: translateY(4px);
}

#intro .intro-start:focus-visible {
  outline: 4px solid var(--yellow);
  outline-offset: 4px;
}

.intro-footnote {
  position: relative;
  z-index: 4;
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
}

@media (max-width: 380px) {
  #intro.intro-card {
    padding-inline: 16px;
  }

  #intro h1 {
    font-size: 42px;
  }

  .intro-scene {
    height: 248px;
    margin-inline: -16px;
  }

  .intro-main {
    height: 200px;
  }

  .intro-friend {
    height: 128px;
  }
}

@media (prefers-reduced-motion: reduce) {
  #intro .intro-start {
    transition: none;
  }
}

#intro.intro-card::before {
  content: "";
  position: absolute;
  z-index: 0;
  inset: 47% -28% -18%;
  transform: perspective(460px) rotateX(58deg);
  transform-origin: center bottom;
  background:
    radial-gradient(circle at 18% 32%, rgba(255, 201, 60, .7) 0 2px, transparent 3px),
    radial-gradient(circle at 74% 20%, rgba(255, 255, 255, .8) 0 2px, transparent 3px),
    linear-gradient(rgba(36, 64, 44, .11) 1px, transparent 1px),
    linear-gradient(90deg, rgba(36, 64, 44, .11) 1px, transparent 1px);
  background-size: auto, auto, 28px 24px, 28px 24px;
  opacity: .72;
  pointer-events: none;
}

.intro-main { animation: intro-main-float 6s ease-in-out infinite; }
.intro-friend-left { animation: intro-friend-left-float 5.5s ease-in-out .2s infinite; }
.intro-friend-right { animation: intro-friend-right-float 5.8s ease-in-out .5s infinite; }
.intro-glow { animation: intro-glow-pulse 4.8s ease-in-out infinite; }

@keyframes intro-main-float {
  0%, 100% { transform: translateX(-50%) translateY(0); filter: drop-shadow(0 10px 8px rgba(86, 42, 23, .18)); }
  50% { transform: translateX(-50%) translateY(-5px); filter: drop-shadow(0 13px 10px rgba(86, 42, 23, .24)); }
}
@keyframes intro-friend-left-float {
  0%, 100% { transform: rotate(-9deg) translateY(0); }
  50% { transform: rotate(-7deg) translateY(-4px); }
}
@keyframes intro-friend-right-float {
  0%, 100% { transform: rotate(9deg) translateY(0); }
  50% { transform: rotate(7deg) translateY(-4px); }
}
@keyframes intro-glow-pulse {
  0%, 100% { opacity: .72; }
  50% { opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  #intro.intro-card::before,
  .intro-main,
  .intro-friend-left,
  .intro-friend-right,
  .intro-glow { animation: none; }
}