/* ── CHALLENGE PAGE ── */
.challenge-body {
  background: var(--black);
}

.challenge-hero {
  padding: 56px 24px 40px;
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}

/* ── 영상 피드: 세로 한 줄, 가운데 정렬 ── */
.feed {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
  padding: 0 20px 100px;
  max-width: 480px;
  margin: 0 auto;
}

.feed-card {
  width: 100%;
  background: var(--surface);
  border: 0.5px solid var(--border);
  border-radius: 18px;
  overflow: hidden;
  transition: border-color 0.2s, transform 0.2s;
}
.feed-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.feed-video-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1; /* 사각형 영상 */
  background: var(--surface2);
  overflow: hidden;
  border-radius: 18px 18px 0 0;
}

.feed-video-wrap video,
.feed-video-wrap .feed-video-placeholder {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: flex;
  align-items: center;
  justify-content: center;
}

.feed-video-placeholder {
  flex-direction: column;
  gap: 10px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 300;
}
.feed-video-placeholder svg {
  width: 36px;
  height: 36px;
  opacity: 0.4;
}

.feed-play-badge {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}
.feed-play-badge svg {
  width: 13px;
  height: 13px;
  color: var(--white);
}

.feed-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
}

.feed-handle {
  font-size: 13px;
  font-weight: 500;
  color: var(--white);
  letter-spacing: 0.01em;
}

.feed-sns-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 0.5px solid var(--border);
  color: var(--text2);
  transition: all 0.18s;
  flex-shrink: 0;
}
.feed-sns-link svg { width: 14px; height: 14px; }
.feed-sns-link:hover {
  border-color: var(--neon);
  color: var(--neon);
}

@media (max-width: 640px) {
  .challenge-hero { padding: 40px 20px 32px; }
  .feed { padding: 0 16px 80px; max-width: 420px; }
}