* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: #f7f8fc;
  font-family: Arial, Helvetica, sans-serif;
  color: #202020;
}

.page {
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  padding: 24px 16px 50px;
}

.gallery {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
}

.banner {
  width: 100%;
  overflow: hidden;
  border-radius: 14px;
  background: #fff;
  box-shadow: 0 5px 20px rgba(20, 38, 90, 0.10);
}

.banner img {
  display: block;
  width: 100%;
  height: auto;
}

.download-wrap {
  width: 100%;
  display: flex;
  justify-content: center;
  padding: 32px 0 36px;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 210px;
  padding: 18px 30px;
  border-radius: 10px;
  background: #98144d;
  color: #fff;
  text-decoration: none;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.2px;
  box-shadow: 0 7px 16px rgba(152, 20, 77, 0.28);
  transition: transform 0.18s ease, background 0.18s ease, box-shadow 0.18s ease;
}

.download-btn:hover {
  background: #86103f;
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(152, 20, 77, 0.34);
}

.download-btn:active {
  transform: translateY(0);
}

.download-btn:focus-visible {
  outline: 3px solid rgba(152, 20, 77, 0.3);
  outline-offset: 3px;
}

/* PC/Desktop mode: hide the image page and show 404 Forbidden instead. */
.desktop-error {
  display: none;
}

@media (min-width: 769px) {
  body {
    background: #fff;
  }

  .page {
    display: none;
  }

  .desktop-error {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 30px;
    text-align: center;
    font-size: clamp(28px, 5vw, 56px);
    font-weight: 700;
    color: #222;
  }
}

@media (max-width: 768px) {
  .page {
    padding: 0;
  }

  .gallery {
    gap: 0;
  }

  .banner {
    border-radius: 10px;
  }

  .download-wrap {
    padding: 28px 0 32px;
  }

  .download-btn {
    width: min(90%, 280px);
    font-size: 17px;
  }
}