:root {
  --bg: #faf7f2;
  --bg-glow: #fff4e8;
  --btn: #ff5a7a;
  --btn-deep: #e83d62;
  --btn-shadow: rgba(232, 61, 98, 0.28);
  --ink: #3a2f35;
  --ink-soft: #7a6a72;
  --safe-top: max(16px, env(safe-area-inset-top, 0px));
  --safe-right: max(16px, env(safe-area-inset-right, 0px));
  --safe-bottom: max(24px, env(safe-area-inset-bottom, 0px));
  --safe-left: max(16px, env(safe-area-inset-left, 0px));
  --font: "M PLUS Rounded 1c", "Hiragino Maru Gothic ProN", "Hiragino Sans", sans-serif;
}

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

html,
body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  overflow: hidden;
  user-select: none;
}

body {
  background:
    radial-gradient(120% 80% at 50% 0%, var(--bg-glow) 0%, transparent 55%),
    radial-gradient(90% 60% at 100% 100%, #ffe8ef 0%, transparent 50%),
    var(--bg);
}

.stage {
  position: relative;
  width: 100%;
  height: 100dvh;
  height: 100vh;
  overflow: hidden;
}

.shrink-btn {
  position: absolute;
  left: 50%;
  top: 50%;
  translate: -50% -50%;
  margin: 0;
  padding: 0;
  border: none;
  border-radius: 999px;
  background: linear-gradient(180deg, #ff7a96 0%, var(--btn) 55%, var(--btn-deep) 100%);
  color: #fff;
  font-family: inherit;
  font-weight: 800;
  letter-spacing: 0.04em;
  cursor: pointer;
  box-shadow:
    0 10px 24px var(--btn-shadow),
    inset 0 1px 0 rgba(255, 255, 255, 0.35);
  display: grid;
  place-items: center;
  overflow: hidden;
  white-space: nowrap;
  line-height: 1;
  z-index: 2;
  transition:
    width 160ms cubic-bezier(0.2, 0.8, 0.2, 1),
    height 160ms cubic-bezier(0.2, 0.8, 0.2, 1),
    font-size 160ms cubic-bezier(0.2, 0.8, 0.2, 1),
    border-radius 160ms ease,
    box-shadow 160ms ease,
    opacity 120ms ease;
  will-change: left, top, width, height;
}

.shrink-btn:active {
  filter: brightness(0.96);
}

.shrink-btn.is-tiny {
  box-shadow: none;
  border-radius: 2px;
  background: var(--btn-deep);
}

.shrink-btn.is-whoosh {
  transition:
    left 180ms cubic-bezier(0.15, 0.85, 0.25, 1),
    top 180ms cubic-bezier(0.15, 0.85, 0.25, 1),
    width 160ms cubic-bezier(0.2, 0.8, 0.2, 1),
    height 160ms cubic-bezier(0.2, 0.8, 0.2, 1),
    font-size 160ms cubic-bezier(0.2, 0.8, 0.2, 1),
    border-radius 160ms ease,
    box-shadow 160ms ease,
    opacity 120ms ease;
}

.shrink-btn.is-pop {
  animation: pop-out 160ms ease-out;
}

@keyframes pop-out {
  0% {
    transform: scale(1);
    opacity: 1;
  }
  45% {
    transform: scale(0.55);
    opacity: 0.55;
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

.messages {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 0;
  padding:
    calc(var(--safe-top) + 24px)
    calc(var(--safe-right) + 24px)
    calc(var(--safe-bottom) + 24px)
    calc(var(--safe-left) + 24px);
  text-align: center;
  pointer-events: none;
  z-index: 1;
}

.messages[hidden] {
  display: none;
}

.msg-primary {
  margin: 0;
  font-size: clamp(1.15rem, 4.8vw, 1.55rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ink);
  animation: fade-up 420ms ease both;
}

.msg-secondary {
  margin: 1.35rem 0 0;
  font-size: clamp(0.85rem, 3.4vw, 1rem);
  font-weight: 500;
  color: var(--ink-soft);
  letter-spacing: 0.06em;
  animation: fade-up 520ms ease 180ms both;
}

.retry {
  pointer-events: auto;
  margin-top: 2.4rem;
  padding: 0.85rem 1.5rem;
  border: 1.5px solid rgba(58, 47, 53, 0.18);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--ink);
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  cursor: pointer;
  backdrop-filter: blur(6px);
  animation: fade-up 560ms ease 320ms both;
}

.retry:active {
  transform: scale(0.98);
}

.retry[hidden] {
  display: none;
}

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

@media (prefers-reduced-motion: reduce) {
  .shrink-btn,
  .shrink-btn.is-whoosh,
  .msg-primary,
  .msg-secondary,
  .retry {
    transition: none !important;
    animation: none !important;
  }
}