/* Challenge page (black & white cyberpunk) */
/* Link after CSS/style.css */

.hero.hero-min { min-height: 42vh; }

/* Layout */
.challenge-section { padding: clamp(2rem, 5vw, 3rem) 0 clamp(3rem, 6vw, 4rem); }
.challenge-grid {
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  gap: clamp(1rem, 2.5vw, 1.4rem);
}
@media (max-width: 980px) { .challenge-grid { grid-template-columns: 1fr; } }

/* Banner */
.banner-card .thumb {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: 12px;
  border: var(--border-w, 1px) solid var(--line, rgba(255,255,255,0.12));
  background: rgba(255,255,255,0.03);
}
.banner-card img {
  width: 100%; height: 100%; object-fit: cover;
  filter: grayscale(1) contrast(1.1) brightness(0.95);
  transform: scale(1.02);
  transition: transform 260ms ease, filter 260ms ease, opacity 260ms ease;
  opacity: 0.95;
}
.banner-card:hover img {
  transform: scale(1.04);
  filter: grayscale(1) contrast(1.2) brightness(1);
  opacity: 1;
}

/* KV details */
.kv { display: grid; gap: .4rem; margin-top: .5rem; }
.kv .row { display: grid; grid-template-columns: 120px 1fr; gap: .75rem; }
.kv .k { color: var(--muted-weak, rgba(255,255,255,0.52)); }
.kv .v { color: var(--fg, #fff); }
@media (max-width: 560px) { .kv .row { grid-template-columns: 1fr; } }

/* Provided */
.provided { display: grid; gap: .5rem; margin-top: .4rem; }
.provided .row { display: grid; grid-template-columns: 120px 1fr; gap: .75rem; align-items: center; }
.hint { margin-top: .5rem; color: var(--muted-weak, rgba(255,255,255,0.52)); }

/* Code block */
.code-head {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: .45rem;
}
.copy-btn {
  appearance: none;
  border: var(--border-w, 1px) solid var(--line, rgba(255,255,255,0.12));
  background: var(--glass, rgba(255,255,255,0.04));
  color: var(--fg, #fff);
  border-radius: 8px; padding: .35rem .6rem; cursor: pointer;
}
.copy-btn:hover { background: rgba(255,255,255,0.08); }
.code-pre {
  margin: 0;
  padding: .9rem 1rem;
  border-radius: 12px;
  border: var(--border-w, 1px) solid var(--line, rgba(255,255,255,0.12));
  background: rgba(255,255,255,0.04);
  overflow: auto;
  font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .95rem;
}

/* Flag */
.flag-wrap {
  display: flex; gap: .5rem; align-items: center; flex-wrap: wrap;
}
.flag {
  display: inline-flex; align-items: center;
  padding: .35rem .6rem;
  border-radius: 8px;
  border: var(--border-w, 1px) solid var(--line, rgba(255,255,255,0.12));
  background: var(--glass, rgba(255,255,255,0.04));
  color: var(--fg, #fff);
  user-select: all;
  word-break: break-all;
}

/* Thumbs used elsewhere */
.thumb {
  position: relative;
  overflow: hidden;
}

/* Back nav */
.post-nav { display: flex; gap: .5rem; margin-top: 1.2rem; justify-content: flex-end; }
@media (max-width: 600px) { .post-nav { justify-content: flex-start; } }
/* Optional: Retro room minor tweaks */
.banner-card img { object-fit: contain; }