:root {
  color-scheme: dark;
  font-family:
    Pretendard, SUIT, "Noto Sans KR", -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
  --page: #0b0c0c;
  --panel: #111313;
  --line: rgb(255 255 255 / 14%);
  --ink: #f6f7f5;
  --muted: rgb(246 247 245 / 58%);
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--page);
}

body {
  min-width: 320px;
  margin: 0;
  background: var(--page);
  color: var(--ink);
}

button,
a {
  color: inherit;
}

.chain-header {
  position: sticky;
  z-index: 10;
  top: 0;
  display: grid;
  height: 5.25rem;
  grid-template-columns: 3rem minmax(0, 1fr) 3rem;
  align-items: center;
  padding: 0 clamp(1rem, 2.7vw, 2.75rem);
  border-bottom: 1px solid var(--line);
  background: rgb(11 12 12 / 88%);
  -webkit-backdrop-filter: blur(18px) saturate(115%);
  backdrop-filter: blur(18px) saturate(115%);
}

.chain-header h1 {
  margin: 0;
  font-size: clamp(1.35rem, 2vw, 2rem);
  font-weight: 640;
  letter-spacing: -0.055em;
  line-height: 1;
  text-align: center;
}

.chain-back {
  display: grid;
  width: 2.7rem;
  height: 2.7rem;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  text-decoration: none;
  transition:
    border-color 180ms ease,
    background-color 180ms ease,
    transform 180ms ease;
}

.chain-back:hover,
.chain-back:focus-visible {
  border-color: rgb(255 255 255 / 55%);
  background: rgb(255 255 255 / 8%);
  outline: none;
  transform: translateX(-0.12rem);
}

.chain-back span {
  font-size: 1.05rem;
  line-height: 1;
}

.chain-count {
  justify-self: end;
  color: var(--muted);
  font-size: 0.76rem;
  font-variant-numeric: tabular-nums;
  font-weight: 660;
  letter-spacing: 0.05em;
}

main {
  padding: clamp(0.75rem, 1.6vw, 1.5rem);
}

.chain-grid {
  display: grid;
  max-width: 118rem;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(0.55rem, 0.9vw, 0.95rem);
  margin: 0 auto;
  padding: 0;
  list-style: none;
}

.chain-card {
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--panel);
}

.chain-image {
  position: relative;
  aspect-ratio: 5 / 4;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background: #191b1a;
}

.chain-image img {
  display: block;
  width: 100%;
  height: 100%;
  filter: grayscale(0.8) saturate(0.48) contrast(1.04) brightness(0.82);
  object-fit: cover;
  transform: scale(1.015);
  transition:
    filter 320ms ease,
    transform 620ms cubic-bezier(0.22, 1, 0.36, 1);
}

.chain-card:hover .chain-image img {
  filter: grayscale(0.42) saturate(0.72) contrast(1.03) brightness(0.88);
  transform: scale(1.055);
}

.chain-caption {
  display: grid;
  min-height: 5.8rem;
  align-content: start;
  gap: 0.45rem;
  padding: clamp(0.9rem, 1.35vw, 1.25rem);
}

.chain-caption h2,
.chain-caption p {
  margin: 0;
  overflow-wrap: anywhere;
  word-break: keep-all;
}

.chain-caption h2 {
  font-size: clamp(0.92rem, 1.1vw, 1.12rem);
  font-weight: 640;
  letter-spacing: -0.04em;
  line-height: 1.25;
}

.chain-caption p {
  color: var(--muted);
  font-size: clamp(0.64rem, 0.72vw, 0.74rem);
  font-weight: 430;
  letter-spacing: -0.018em;
  line-height: 1.5;
}

@media (min-width: 1720px) {
  .chain-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (max-width: 980px) {
  .chain-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .chain-header {
    height: 4.5rem;
    padding-inline: 0.8rem;
  }

  main {
    padding: 0.5rem;
  }

  .chain-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.45rem;
  }

  .chain-caption {
    min-height: 6.25rem;
    padding: 0.8rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .chain-back,
  .chain-image img {
    transition: none;
  }
}