/**
 * Lib-Top Grid Layout Styles
 * 3-Column responsive grid with hover-safe calculations
 */

:root {
  --lib-top-padding: clamp(2rem, 6vw, 4rem);
  --lib-top-gap: 1.25rem;
  --lib-top-transition: transform 0.3s ease, opacity 0.3s ease;
  --lib-top-hover-scale: 1.02;
  --lib-top-hover-opacity: 0.9;
  --lib-top-border-radius: 10px;
  --lib-top-border-radius-mobile: 8px;
}

/* Core Lib-Top Responsive Component */
.lib-top-section-responsive {
  position: relative;
  width: 100%;
  padding: var(--lib-top-padding) 0;
  overflow-x: hidden;
  overflow-y: hidden;
  transition: all 0.3s ease;
  min-height: fit-content;
}

@media (max-width: 767px) {
  .lib-top-section-responsive {
    padding: clamp(1rem, 3vw, 1.5rem) 0;
  }
}

/* Containers */
.lib-top-container-desktop {
  display: none;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 3vw, 1.5rem);
  box-sizing: border-box;
  overflow-x: hidden;
  overflow-y: hidden;
}

.lib-top-container-mobile {
  display: block;
  width: 100%;
  padding: 0 clamp(0.5rem, 2vw, 1rem);
  box-sizing: border-box;
  overflow-x: hidden;
  overflow-y: hidden;
}

/* === RESPONSIVE SYSTEM === */

@media (min-width: 1024px) {
  .lib-top-container-desktop {
    display: block !important;
  }
  .lib-top-container-mobile {
    display: none !important;
  }
}

@media (min-width: 768px) and (max-width: 1023px) {
  .lib-top-container-desktop {
    display: block !important;
    max-width: 900px;
    padding: 0 1rem;
  }
  .lib-top-container-mobile {
    display: none !important;
  }
  .lib-top-grid-4col {
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    max-width: 100%;
    overflow-y: hidden;
  }
  .tokyo-area,
  .osaka-area,
  .tohoku-area {
    aspect-ratio: 660/606;
    max-width: clamp(160px, 22vw, 245px);
    overflow: hidden;
  }
}

@media (max-width: 767px) {
  .lib-top-container-desktop {
    display: none !important;
  }
  .lib-top-container-mobile {
    display: block !important;
    margin: 0 auto;
    overflow-x: hidden;
  }
  .lib-top-grid-mobile {
    padding: 0;
    margin: 0;
  }
}

/* === GRID LAYOUTS === */

.lib-top-grid-4col {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--lib-top-gap);
  max-width: 1200px;
  margin: 0 auto;
  place-items: center;
  overflow-x: hidden;
  overflow-y: hidden;
}

.lib-top-grid-mobile {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin: 0 auto;
  align-items: center;
  overflow: hidden;
}

/* === AREA CONTAINERS === */

.tokyo-area,
.osaka-area,
.tohoku-area {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--lib-top-transition);
  overflow: hidden;
}

@media (min-width: 1024px) {
  .tokyo-area,
  .osaka-area,
  .tohoku-area {
    aspect-ratio: 660/606;
    max-width: clamp(260px, 29vw, 355px);
    overflow: hidden;
  }
}

/* === INTERACTIVE STATES === */

.tokyo-area:hover,
.osaka-area:hover,
.tohoku-area:hover {
  transform: scale(var(--lib-top-hover-scale));
  opacity: var(--lib-top-hover-opacity);
}

/* マウスクリック時: アウトラインなし */
.tokyo-area:focus,
.osaka-area:focus,
.tohoku-area:focus {
  outline: none;
}

/* キーボード操作時のみ: 青いグロー効果で視認性確保 */
.tokyo-area:focus-visible,
.osaka-area:focus-visible,
.tohoku-area:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px rgba(58, 68, 255, 0.6),
              0 0 25px rgba(58, 68, 255, 0.4);
  transform: scale(1.03);
  z-index: 10;
  transition: all 0.2s ease;
}

/* === IMAGE STYLING === */

.tokyo-area img,
.osaka-area img,
.tohoku-area img {
  width: 100%;
  object-fit: contain;
  object-position: center;
}

@media (min-width: 768px) {
  .tokyo-area img,
  .osaka-area img,
  .tohoku-area img {
    height: 100%;
  }
  .tokyo-area img[src*="desk-libtop"],
  .osaka-area img[src*="desk-libtop"],
  .tohoku-area img[src*="desk-libtop"] {
    border-radius: var(--lib-top-border-radius);
  }
}

@media (max-width: 767px) {
  .lib-top-grid-mobile .tokyo-area img,
  .lib-top-grid-mobile .osaka-area img,
  .lib-top-grid-mobile .tohoku-area img {
    height: auto;
    display: block;
  }
  .lib-top-container-mobile .tokyo-area,
  .lib-top-container-mobile .osaka-area,
  .lib-top-container-mobile .tohoku-area {
    aspect-ratio: auto;
    height: fit-content;
    padding: 0.25rem 0;
  }
  .tokyo-area img[src*="sp-libtop"],
  .osaka-area img[src*="sp-libtop"],
  .tohoku-area img[src*="sp-libtop"] {
    border-radius: var(--lib-top-border-radius-mobile);
  }
}

/* === ERROR & ACCESSIBILITY === */

.tokyo-area img:not([src]),
.osaka-area img:not([src]),
.tohoku-area img:not([src]) {
  background-color: rgba(255, 255, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
}

.tokyo-area img:not([src])::after,
.osaka-area img:not([src])::after,
.tohoku-area img:not([src])::after {
  content: "Image Loading...";
  color: white;
  font-size: 0.875rem;
  opacity: 0.6;
}

@media (prefers-reduced-motion: reduce) {
  .tokyo-area,
  .osaka-area,
  .tohoku-area {
    transition: none;
  }
  .tokyo-area:hover,
  .osaka-area:hover,
  .tohoku-area:hover {
    transform: none;
  }
}


/* === SMALL MOBILE (375px-) === */

@media (max-width: 375px) {
  :root {
    --lib-top-padding: clamp(1rem, 4vw, 2rem);
    --lib-top-gap: 1rem;
  }
  .lib-top-container-mobile {
    padding: 0 0.5rem;
  }
  .lib-top-grid-mobile .tokyo-area,
  .lib-top-grid-mobile .osaka-area,
  .lib-top-grid-mobile .tohoku-area {
    padding: 0.5rem 0;
  }
  .lib-top-grid-mobile img {
    max-height: clamp(100px, 15vw, 120px);
  }
}