.paper-layer {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);

  width: min(92vw, 980px);
  height: min(88dvh, 640px);
  min-width: 320px;

  z-index: 8;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.5s ease, visibility 0.5s ease;

  --edge-inline: clamp(0.85rem, 2.2vw, 2.4rem);
  --faq-top: clamp(0.9rem, 2.5vh, 2rem);
  --faq-bottom: clamp(2.8rem, 8vh, 5rem);
  --nav-size: clamp(2rem, 2.6vw, 2.8rem);
  --close-size: clamp(1.3rem, 1.8vw, 2rem);
}

.paper-layer.is-visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.paper-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: fill;
  pointer-events: none;
  user-select: none;
}

.paper-content {
  position: absolute;
  inset: 0;
  padding: clamp(0.75rem, 2vw, 1.6rem);
  overflow: hidden;
  color: var(--paper-text-color);
}

.paper-text {
  margin: var(--faq-top) var(--edge-inline) var(--faq-bottom);
  width: auto;
  font-family: var(--ui-font-family);
  font-size: var(--paper-text-size);
  line-height: 1.33;
  font-weight: 700;
  color: var(--paper-text-color);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.45s ease, visibility 0.45s ease;
}

.paper-text.is-visible {
  opacity: 1;
  visibility: visible;
}

.paper-text.is-fade-out {
  opacity: 0;
}

.faq {
  margin: var(--faq-top) var(--edge-inline) var(--faq-bottom);
  opacity: 0;
  transform: translateY(0.35rem);
  overflow: auto;
  max-height: calc(100% - var(--faq-top) - var(--faq-bottom));
  padding-inline-end: 0.25rem;
}

.faq.is-visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.35s ease, transform 0.35s ease;
}

.faq-title {
  margin: 0 0 clamp(0.45rem, 1vh, 0.8rem);
  font-family: var(--ui-font-family);
  font-size: clamp(1.4rem, 2.4vw, 2.7rem);
  color: var(--paper-text-color);
}

.faq-list {
  display: grid;
  gap: clamp(0.45rem, 1vh, 0.8rem);
}

.faq-item {
  border: 1px solid rgba(81, 90, 108, 0.24);
  border-radius: clamp(0.45rem, 0.9vw, 0.8rem);
  background: rgba(255, 255, 255, 0.24);
  padding: clamp(0.55rem, 1.1vw, 0.95rem);
}

.faq-question {
  margin: 0 0 clamp(0.3rem, 0.8vh, 0.6rem);
  font-family: var(--ui-font-family);
  font-size: clamp(0.95rem, 1.2vw, 1.5rem);
  line-height: 1.25;
  font-weight: 700;
  color: var(--paper-text-color);
}

.faq-answer {
  margin: 0;
  font-family: var(--ui-font-family);
  font-size: clamp(0.86rem, 1vw, 1.15rem);
  line-height: 1.32;
  color: var(--paper-text-color);
}

.paper-next,
.paper-back {
  position: absolute;
  inline-size: var(--nav-size);
  block-size: var(--nav-size);
  border: 0;
  background: transparent;
  padding: 0;
  margin: 0;
  cursor: pointer;

  inset-block-end: calc(var(--faq-bottom) - clamp(0.5rem, 1.2vh, 0.9rem));
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.paper-back {
  inset-inline-start: calc(var(--edge-inline) - clamp(0.35rem, 0.7vw, 0.55rem));
}

.paper-next {
  inset-inline-end: calc(var(--edge-inline) - clamp(0.35rem, 0.7vw, 0.55rem));
}

.paper-next img,
.paper-back img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.paper-next.is-visible,
.paper-back.is-visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.paper-close {
  position: absolute;
  inline-size: var(--close-size);
  block-size: var(--close-size);
  border: 0;
  background: transparent;
  padding: 0;
  margin: 0;
  cursor: pointer;
  z-index: 10;

  inset-block-start: var(--faq-top);
  inset-inline-end: var(--edge-inline);

  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}

.paper-close img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.paper-close.is-visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

@media (max-width: 900px) {
  .paper-layer {
    width: 95vw;
    height: min(90dvh, 620px);
    --edge-inline: clamp(0.7rem, 3.2vw, 1.4rem);
    --faq-top: clamp(0.7rem, 2.2vh, 1.2rem);
    --faq-bottom: clamp(2.4rem, 7.5vh, 4rem);
    --nav-size: clamp(2.1rem, 7vw, 2.6rem);
    --close-size: clamp(1.2rem, 4vw, 1.7rem);
  }

  .faq-title {
    font-size: clamp(1.2rem, 5vw, 1.9rem);
  }

  .faq-question {
    font-size: clamp(0.92rem, 3.7vw, 1.12rem);
  }

  .faq-answer {
    font-size: clamp(0.83rem, 3.3vw, 1rem);
  }
}

@media (max-width: 640px) {
  .paper-layer {
    width: 96vw;
    height: min(92dvh, 300px);
  }

  .paper-content {
    padding: 0.7rem;
  }

  .paper-next,
  .paper-back {
    inset-block-end: calc(var(--faq-bottom) - 2rem);
  }
  
  .faq-title {
    font-size: clamp(1rem, 3vw, 1.5rem);
  }

  .faq-question {
    font-size: clamp(0.7rem, 2vw, 1rem);
  }

  .faq-answer {
    font-size: clamp(0.7rem, 2vw, 1rem);
  }
}

@media (max-height: 500px) and (orientation: landscape) {
  .paper-layer {
    width: min(96vw, 900px);
    height: min(94dvh, 430px);
  }

  .faq {
    max-height: calc(100% - var(--faq-top) - var(--faq-bottom));
  }
}

.faq-answer a {
  color: #8ea4e6;      
  text-decoration: none; 
}

.faq-answer a:visited {
  color: #C562FB;       
}

.faq-answer a:hover,
.faq-answer a:focus-visible {
  color: #98D9CC;       
  text-decoration: none;
}

.faq-answer .copy-link {
  display: inline;
  border: 0;
  padding: 0;
  margin: 0;
  background: transparent;
  font: inherit;
  font-weight: 700;
  color: #6f86c9;
  text-decoration: none;
  cursor: pointer;
}

.faq-answer .copy-link:hover,
.faq-answer .copy-link:focus-visible {
  color: #8ea4e6;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.faq-answer .copy-link.is-copied {
  color: #4fa36b;
}

.paper-layer {
  --safe-top: env(safe-area-inset-top, 0px);
  --content-top-offset: clamp(28px, 5.5vh, 56px);
}

.paper-text {
  margin-top: calc(var(--faq-top) + var(--content-top-offset) + var(--safe-top));
}

.faq {
  margin-top: calc(var(--faq-top) + var(--content-top-offset) + var(--safe-top));
}

.paper-close {
  inset-block-start: calc(var(--faq-top) + var(--content-top-offset) + var(--safe-top));
}

@media (max-width: 900px) {
  .paper-layer {
    --content-top-offset: clamp(16px, 5.2vh, 34px);
  }
}

@media (max-width: 640px) {
  .paper-layer {
    --content-top-offset: clamp(14px, 5.8vh, 30px);
  }
}