:root {
  --paper: #fbfcff;
  --ink: #111827;
  --navy: #123e82;
  --blue: #2f7be6;
  --pale: #d6e4f8;
  --pale-2: #eef5ff;
  --gold: #f6c95f;
  --rose: #e95f7c;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: #e8edf5;
  color: var(--ink);
  font-family: "Yu Gothic", "YuGothic", "Hiragino Kaku Gothic ProN", "Meiryo", sans-serif;
}

.stage {
  padding: 28px;
}

.cover {
  position: relative;
  width: min(72vw, 760px);
  aspect-ratio: 1 / 1.4142;
  overflow: hidden;
  background:
    linear-gradient(160deg, rgba(255,255,255,.96), rgba(241,247,255,.7) 58%, rgba(255,255,255,.98)),
    var(--paper);
  box-shadow:
    0 24px 70px rgba(18, 62, 130, .22),
    0 2px 8px rgba(17, 24, 39, .08);
}

.cover::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(90deg, rgba(47,123,230,.16), transparent 13%, transparent 87%, rgba(47,123,230,.08)),
    radial-gradient(circle at 80% 15%, rgba(246,201,95,.28), transparent 18%),
    radial-gradient(circle at 18% 64%, rgba(214,228,248,.55), transparent 24%);
  mix-blend-mode: multiply;
}

.cover::after {
  content: "";
  position: absolute;
  inset: 20px;
  border: 1px solid rgba(47, 123, 230, .25);
  pointer-events: none;
}

.cover-art {
  position: absolute;
  left: 50%;
  bottom: 112px;
  width: 86%;
  transform: translateX(-50%);
  opacity: .96;
  filter: saturate(1.04) contrast(1.02);
}

.top-rule {
  position: absolute;
  top: 36px;
  left: 54px;
  right: 54px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(18, 62, 130, .24);
  color: var(--navy);
  font-family: Arial, sans-serif;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .12em;
}

.title-block {
  position: absolute;
  top: 92px;
  left: 54px;
  right: 54px;
}

.series {
  width: fit-content;
  margin: 0 0 18px;
  padding: 9px 14px;
  border: 1px solid rgba(47, 123, 230, .55);
  border-radius: 999px;
  background: rgba(255, 255, 255, .72);
  color: var(--blue);
  font-size: 15px;
  font-weight: 800;
}

h1 {
  margin: 0;
  color: var(--navy);
  font-size: clamp(54px, 7.6vw, 82px);
  font-weight: 900;
  line-height: .98;
  letter-spacing: 0;
  text-wrap: balance;
}

h1 span {
  display: block;
}

h1 span:nth-child(2) {
  width: fit-content;
  background: linear-gradient(100deg, var(--navy), var(--blue) 52%, #0d5fd1);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.subtitle {
  margin: 22px 0 0;
  width: fit-content;
  max-width: 560px;
  padding: 14px 18px;
  border-radius: 6px;
  background: rgba(214, 228, 248, .88);
  color: #111827;
  font-size: 19px;
  font-weight: 800;
  line-height: 1.55;
}

.foil-badge {
  position: absolute;
  top: 118px;
  right: 54px;
  width: 112px;
  height: 112px;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 2px;
  border-radius: 50%;
  border: 1px solid rgba(139, 102, 25, .38);
  background:
    linear-gradient(135deg, #fff8d7, #f6c95f 38%, #fff3ba 56%, #d69d31);
  color: #573b06;
  box-shadow:
    0 8px 20px rgba(87, 59, 6, .18),
    inset 0 1px 0 rgba(255, 255, 255, .7);
  transform: rotate(7deg);
}

.foil-badge span {
  font-size: 11px;
  font-weight: 900;
  letter-spacing: .06em;
}

.foil-badge strong {
  font-family: Arial, sans-serif;
  font-size: 30px;
  line-height: .95;
}

.keyword-row {
  position: absolute;
  left: 54px;
  right: 54px;
  bottom: 204px;
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  justify-content: center;
}

.keyword-row span {
  padding: 7px 11px;
  border: 1px solid rgba(47, 123, 230, .55);
  border-radius: 999px;
  background: rgba(255, 255, 255, .76);
  color: var(--navy);
  font-family: Arial, sans-serif;
  font-size: 12px;
  font-weight: 700;
}

.obi {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 46px;
  padding: 20px 54px;
  background:
    linear-gradient(90deg, var(--navy), #1856b3 58%, var(--blue));
  color: white;
  box-shadow: 0 -10px 24px rgba(18, 62, 130, .14);
}

.obi p {
  margin: 0;
  font-size: 19px;
  font-weight: 900;
  line-height: 1.45;
}

.author {
  position: absolute;
  left: 54px;
  bottom: 20px;
  margin: 0;
  color: rgba(18, 62, 130, .72);
  font-family: Arial, sans-serif;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .1em;
}

@media (max-width: 760px) {
  .stage {
    padding: 12px;
  }

  .cover {
    width: calc(100vw - 24px);
  }

  .top-rule,
  .title-block,
  .keyword-row,
  .author {
    left: 34px;
    right: 34px;
  }

  .foil-badge {
    right: 34px;
    width: 92px;
    height: 92px;
  }

  .subtitle,
  .obi p {
    font-size: 16px;
  }

  .cover-art {
    bottom: 108px;
  }

  .obi {
    padding-inline: 34px;
  }
}