.game-notebook {
  padding-bottom: 34px;
}

.game-page {
  padding-top: 25px;
}

.game-page h1 {
  margin: 0 0 4px;
  font-size: clamp(24px, 4vw, 38px);
}

.game-current-version {
  margin: 0 0 14px;
  color: var(--pencil);
  font-size: 13px;
}

.unity-frame {
  width: 100%;
  height: clamp(420px, 54vw, 640px);
  overflow: hidden;
  border: 2px solid var(--ink);
  background: #e7eecf;
}

.unity-frame iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}

.game-controls {
  margin: 12px 0 0;
  color: var(--pencil);
  font-size: 13px;
  line-height: 1.7;
}

.update-history {
  margin-top: 30px;
  padding-top: 18px;
  border-top: 1px solid var(--ink);
  color: var(--ink);
}

.update-history h2 {
  margin: 0 0 12px;
  font-size: 20px;
}

.update-history-archive {
  margin-top: 8px;
}

.update-history-archive summary {
  cursor: pointer;
  padding: 6px 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
}

.update-history-archive summary:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 4px;
}

.update-history-entries {
  padding-top: 14px;
}

.update-entry + .update-entry {
  margin-top: 17px;
}

.update-entry h3 {
  margin: 0 0 5px;
  font-size: 15px;
}

.update-entry time {
  margin-left: 0.5em;
  color: var(--pencil);
  font-size: 12px;
  font-weight: 400;
}

.update-entry ul {
  margin: 0;
  padding-left: 1.5em;
  line-height: 1.75;
  font-size: 13px;
}

@media (max-width: 780px) {
  .unity-frame {
    height: min(68svh, 620px);
    min-height: 400px;
  }
}

/* ver3.0: the full screen button under the game, the page-filling view (iPhone Safari and other
   browsers without full screen for a page element), the guide. */
.game-fullscreen {
  margin: 10px 0 0;
  text-align: right;
}

.game-fullscreen button {
  font: inherit;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  padding: 6px 14px;
  border: 2px solid var(--ink);
  border-radius: 4px;
  background: #fffdf4;
  cursor: pointer;
  transform: rotate(-0.6deg);
}

.game-fullscreen button:hover,
.game-fill-bar button:hover {
  background: #f6d55c;
}

.game-fill-bar {
  display: none;
}

body.game-filled {
  overflow: hidden;
}

body.game-filled .unity-frame {
  position: fixed;
  left: 0;
  top: 0;
  width: 100vw;
  z-index: 1000;
  border: 0;
}

body.game-filled .game-fill-bar {
  display: flex;
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1001;
  justify-content: flex-end;
  align-items: center;
  margin: 0;
  min-height: 40px;
  box-sizing: border-box;
  padding: 4px 12px calc(4px + env(safe-area-inset-bottom, 0px));
  background: #fffdf4;
  border-top: 2px solid var(--ink);
}

.game-fill-bar button {
  font: inherit;
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
  padding: 4px 14px;
  border: 2px solid var(--ink);
  border-radius: 4px;
  background: #fffdf4;
  cursor: pointer;
}

.game-guide {
  margin-top: 26px;
  color: var(--ink);
}

.game-guide h2 {
  margin: 0 0 10px;
  font-size: 20px;
}

.game-guide-list {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 6px 14px;
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
}

.game-guide-list dt {
  font-weight: 700;
}

.game-guide-list dd {
  margin: 0;
}

.game-note {
  margin: 12px 0 0;
  color: var(--pencil);
  font-size: 13px;
  line-height: 1.7;
}

@media (max-width: 560px) {
  .game-guide-list {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .game-guide-list dd {
    margin-bottom: 8px;
  }
}