.open-ebook-page {
  position: fixed;
  inset: 0;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 20px;
  box-sizing: border-box;
  padding: calc(24px + var(--safe-area-top)) calc(24px + var(--safe-area-right))
    calc(24px + var(--safe-area-bottom)) calc(24px + var(--safe-area-left));
  overflow: hidden;
  text-align: center;
  color: #dcffe7;
  background:
    radial-gradient(circle at 16% 12%, rgba(120, 209, 120, 0.18), transparent 42%),
    radial-gradient(circle at 82% 84%, rgba(55, 173, 129, 0.18), transparent 44%),
    linear-gradient(165deg, #0f4b38 0%, #0b3d2e 52%, #082c22 100%);
  font-family: "Avenir Next", "Trebuchet MS", "Gill Sans", sans-serif;
}

.open-ebook-page::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(115deg, rgba(255, 255, 255, 0.06), transparent 35%),
    repeating-linear-gradient(
      45deg,
      rgba(207, 255, 229, 0.035) 0,
      rgba(207, 255, 229, 0.035) 1px,
      transparent 1px,
      transparent 14px
    );
  pointer-events: none;
}

.open-ebook-container {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  width: min(560px, 100%);
  max-height: min(780px, calc(100dvh - var(--safe-area-top) - var(--safe-area-bottom) - 120px));
  overflow: auto;
  padding: clamp(22px, 4.6vw, 38px);
  border: 1px solid rgba(120, 209, 120, 0.28);
  border-radius: 24px;
  box-sizing: border-box;
  background: linear-gradient(180deg, rgba(8, 44, 34, 0.7), rgba(8, 44, 34, 0.48));
  box-shadow: 0 28px 62px rgba(4, 17, 13, 0.38);
  backdrop-filter: blur(3px);
  -webkit-overflow-scrolling: touch;
}

.book-icon-container {
  width: 136px;
  height: 136px;
  margin-bottom: 6px;
}

.book-icon {
  display: block;
  width: 100%;
  filter: drop-shadow(0 8px 14px rgba(5, 20, 16, 0.35));
}

.open-ebook-title {
  font-weight: 700;
  font-size: clamp(14px, 2vw, 19px);
  line-height: 1.12;
  letter-spacing: 0.01em;
  color: #dffded;
}

.open-ebook-info {
  margin-top: 12px;
  font-size: clamp(15px, 2.8vw, 18px);
  line-height: 1.45;
  font-weight: 500;
  color: rgba(221, 255, 237, 0.94);
}

.open-ebook-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: min(100%, 280px);
  height: 48px;
  margin-top: 22px;
  margin-bottom: 12px;
  border: 1px solid rgba(86, 146, 86, 0.48);
  border-radius: 999px;
  background: linear-gradient(180deg, #87e087 0%, #78d178 100%);
  color: #093527;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.01em;
  box-shadow: 0 10px 22px rgba(10, 33, 25, 0.26);
  transition: transform 0.18s ease, box-shadow 0.18s ease, filter 0.18s ease;
}

.open-ebook-btn:hover {
  transform: translateY(-1px);
  filter: brightness(1.02);
  box-shadow: 0 14px 28px rgba(10, 33, 25, 0.33);
  color: #072d22;
}

.open-ebook-btn:focus-visible {
  outline: 3px solid rgba(207, 255, 229, 0.96);
  outline-offset: 3px;
}

.open-ebook-btn:active {
  transform: translateY(0);
  box-shadow: 0 8px 16px rgba(10, 33, 25, 0.25);
}

.hidden-ebook-input {
  display: none;
}

.open-ebook-info-two {
  width: min(92%, 470px);
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.5;
  color: rgba(209, 255, 233, 0.76);
}

.copyright-text {
  position: absolute;
  right: calc(24px + var(--safe-area-right));
  bottom: calc(16px + var(--safe-area-bottom));
  z-index: 1;
  color: rgba(200, 237, 221, 0.62);
  font-size: 13px;
  line-height: 1.2;
  font-weight: 500;
}

.copyright-text:hover {
  color: rgba(195, 255, 219, 0.9);
}

@media (max-width: 640px) {
  .open-ebook-page {
    padding: calc(20px + var(--safe-area-top)) calc(14px + var(--safe-area-right))
      calc(18px + var(--safe-area-bottom)) calc(14px + var(--safe-area-left));
  }

  .open-ebook-container {
    border-radius: 18px;
    padding: 18px 16px 20px;
  }

  .book-icon-container {
    width: 112px;
    height: 112px;
  }

  .open-ebook-btn {
    width: min(100%, 260px);
    height: 46px;
  }

  .copyright-text {
    position: static;
    margin-top: 2px;
    font-size: 12px;
  }
}

@media (max-width: 480px) {
  .open-ebook-page {
    gap: 14px;
  }

  .open-ebook-container {
    padding: 16px 14px 18px;
  }

  .open-ebook-title {
    font-size: clamp(14px, 5.8vw, 18px);
  }

  .open-ebook-info {
    font-size: 14px;
  }

  .open-ebook-info-two {
    font-size: 13px;
  }
}

@media (max-height: 720px) {
  .open-ebook-page {
    gap: 14px;
  }

  .open-ebook-container {
    padding: 16px 14px 18px;
    border-radius: 18px;
  }

  .book-icon-container {
    width: 104px;
    height: 104px;
  }
}

@media (orientation: landscape) and (max-height: 500px) {
  .open-ebook-page {
    justify-content: flex-start;
    padding-top: calc(var(--safe-area-top) + 16px);
  }

  .open-ebook-container {
    max-height: calc(100dvh - var(--safe-area-top) - var(--safe-area-bottom) - 84px);
  }
}