.deep {
width: 100%;
height: 100vh;

display: flex;
justify-content: center;
align-items: center;

text-align: center;

position: relative;
z-index: 10;
}

.deep__intro {
display: flex;
flex-direction: column;
align-items: center;

gap: 20px;

color: #d6f6ff;

position: relative;
z-index: 20;
}

.deep__message {
position: fixed;

left: 50%;
top: 50%;

transform: translate(-50%, -50%);

width: min(90%, 600px);

padding: 40px;

border: 1px solid rgba(214, 246, 255, 0.2);

background: rgba(0, 10, 20, 0.85);

line-height: 2;

z-index: 30;

opacity: 0;

pointer-events: none;

color: #d6f6ff;
}


.deep__message.is-show {
animation: driftFade 8s ease forwards;
}

@keyframes driftFade {

0% {
opacity: 0;
}

15% {
opacity: 1;
}

60% {
opacity: 1;
}

100% {
opacity: 0;
}

}


/* =========================
泡
========================= */

.deep-bubbles {
position: fixed;
inset: 0;

pointer-events: none;
overflow: hidden;

z-index: 5;
}

.deep-bubbles span {
position: absolute;

bottom: -100px;

width: 14px;
height: 14px;

border: 1px solid rgba(214, 246, 255, 0.4);
border-radius: 50%;

opacity: 0;

animation: deepBubble 12s linear infinite;
}

.deep-bubbles span:nth-child(1) {
left: 10%;
animation-delay: 0s;
}

.deep-bubbles span:nth-child(2) {
left: 25%;
animation-delay: 2s;
width: 8px;
height: 8px;
}

.deep-bubbles span:nth-child(3) {
left: 45%;
animation-delay: 5s;
width: 16px;
height: 16px;
}

.deep-bubbles span:nth-child(4) {
left: 65%;
animation-delay: 1s;
width: 10px;
height: 10px;
}

.deep-bubbles span:nth-child(5) {
left: 80%;
animation-delay: 7s;
width: 18px;
height: 18px;
}

.deep-bubbles span:nth-child(6) {
left: 92%;
animation-delay: 4s;
width: 6px;
height: 6px;
}

@keyframes deepBubble {

0% {
transform: translateY(0);
opacity: 0;
}

15% {
opacity: 0.4;
}

100% {
transform: translateY(-120vh);
opacity: 0;
}

}

/* =========================
泡
========================= */

.deep-bubbles span {

background: rgba(214, 246, 255, 0.15);

border: 1px solid rgba(214, 246, 255, 0.4);

}
/* =========================
レアログ
========================= */

.deep__message.is-rare {
animation: driftFadeRare 45s ease forwards;

font-size: 0.9rem;
letter-spacing: 0.08em;
}

@keyframes driftFadeRare {

0% {
opacity: 0;
}

5% {
opacity: 1;
}

90% {
opacity: 1;
}

100% {
opacity: 0;
}

}
/* =========================
レアログ区切り
========================= */

.deep-gap {
height: 1.5em;
}
/* =========================
LOG
========================= */

.deep__message.is-rare {
font-family: "DotGothic16", sans-serif;
}
.deep__return {
  margin-top: 40px;
  text-align: center;
  font-size: 14px;
}

.deep__return a {
  color: #b0c4de;
  text-decoration: none;
  opacity: 0.8;
}

.deep__return a:hover {
  opacity: 1;
  text-decoration: underline;
}
.deep__return {
  position: fixed;
  left: 50%;
  bottom: 28px;
  transform: translateX(-50%);
  z-index: 10;
  font-size: 14px;
}

.deep__return a {
  color: #b0c4de;
  text-decoration: none;
  opacity: 0.85;
}

.deep__return a:hover {
  opacity: 1;
  text-decoration: underline;
}