:root {
  --board-max-width: 1200px;
  --board-gap: 8px;
  --card-radius: 10px;
  --card-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
  --page-bg: #ffffff;
  --card-bg: #ffffff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Yu Gothic", "Hiragino Kaku Gothic ProN", sans-serif;
  background: var(--page-bg);
  color: #111;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.site-header {
  max-width: var(--board-max-width);
  margin: 0 auto;
  padding: 14px 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.site-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: #111;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.site-logo img {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  object-fit: cover;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 16px;
}

.site-nav a {
  color: #333;
  text-decoration: none;
  font-size: 14px;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: #000;
  text-decoration: underline;
}

.masonry-board {
  max-width: var(--board-max-width);
  margin: 0 auto;
  padding: var(--board-gap);
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  grid-auto-rows: 6px;
  grid-auto-flow: dense;
  gap: var(--board-gap);
  align-items: start;
}

footer {
  max-width: var(--board-max-width);
  margin: 12px auto 20px;
  padding: 0 8px;
  color: #666;
  font-size: 12px;
}

.pin-card {
  position: relative;
  margin: 0;
  border-radius: var(--card-radius);
  background: var(--card-bg);
  box-shadow: var(--card-shadow);
  overflow: hidden;
  content-visibility: auto;
  contain-intrinsic-size: 240px 320px;
}

.pin-card[hidden] {
  display: none !important;
}

.load-sentinel {
  grid-column: 1 / -1;
  width: 100%;
  height: 1px;
}

.pin-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.18);
  opacity: 0;
  transition: opacity 0.2s ease;
  pointer-events: none;
}

.pr-site-button {
  position: absolute;
  left: 50%;
  bottom: 12px;
  transform: translate(-50%, 8px);
  opacity: 0;
  z-index: 2;
  display: inline-block;
  padding: 6px 10px;
  border-radius: 999px;
  background: #ffffff;
  color: #111111;
  font-size: 11px;
  font-weight: 700;
  text-decoration: none;
  line-height: 1;
  transition:
    opacity 0.2s ease,
    transform 0.2s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.18);
}

.pin-card:hover::before,
.pin-card:focus-within::before {
  opacity: 1;
}

.pin-card:hover .pr-site-button,
.pin-card:focus-within .pr-site-button {
  opacity: 1;
  transform: translate(-50%, 0);
}

.pin-card img,
.pin-card iframe,
.pin-card video {
  display: block;
  width: 100%;
  height: auto;
  border: 0;
}

.pin-card img[loading="lazy"] {
  background: #f6f6f6;
}

.pin-card iframe {
  aspect-ratio: 16 / 9;
}

.pin-card .sample_block {
  width: 100% !important;
  background: transparent !important;
}

.pin-card p {
  margin: 2px 8px;
  font-size: 11px;
  line-height: 1.2;
}

@media (max-width: 1080px) {
  .masonry-board {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .site-header {
    padding-top: 10px;
    padding-bottom: 10px;
  }

  .site-logo span {
    font-size: 14px;
  }

  .site-nav {
    gap: 12px;
  }

  .masonry-board {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .pin-card {
    border-radius: var(--card-radius);
  }

  .pin-card.pin-video {
    grid-column: 1 / -1;
  }
}

@media (max-width: 480px) {
  .masonry-board {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .pin-card.pin-video {
    grid-column: 1 / -1;
  }
}