.bk-wrap { max-width: 1180px; margin: 0 auto; }

.bk-head {
  display: flex; align-items: flex-start; justify-content: space-between;
  gap: 20px; flex-wrap: wrap; margin-bottom: 22px;
}
.bk-title { font-size: 1.5rem; font-weight: 800; color: var(--text, #e6edf3); margin: 0 0 6px; }
.bk-sub { font-size: .86rem; color: var(--text-muted, #8b949e); line-height: 1.6; max-width: 720px; margin: 0; }
.bk-sub strong { color: #22d3ee; }

.bk-download {
  flex-shrink: 0;
  padding: 9px 16px; border-radius: 10px;
  border: 1px solid rgba(34, 211, 238, .45);
  background: rgba(34, 211, 238, .08);
  color: #22d3ee; font-size: .82rem; font-weight: 700; text-decoration: none;
  white-space: nowrap;
}
.bk-download:hover { background: rgba(34, 211, 238, .15); }

.bk-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.bk-card {
  border: 1px solid var(--border, rgba(255, 255, 255, .1));
  border-radius: 16px;
  background: var(--card-bg, rgba(255, 255, 255, .02));
  padding: 16px;
  display: flex; flex-direction: column;
}
.bk-card--empty { opacity: .7; }

.bk-card-head { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; margin-bottom: 12px; }
.bk-target { font-weight: 800; font-size: 1rem; color: var(--text, #e6edf3); }
.bk-tid { font-family: var(--font-mono, monospace); font-size: .68rem; color: var(--text-muted, #8b949e); }

.bk-struct {
  background: #fff; border-radius: 12px; padding: 6px;
  display: flex; align-items: center; justify-content: center;
  min-height: 150px; margin-bottom: 10px;
}
.bk-struct img { max-width: 100%; height: auto; display: block; }

.bk-codename {
  font-family: var(--font-mono, monospace); font-size: .82rem; font-weight: 700;
  color: #9fe8ff; text-align: center; margin-bottom: 12px;
}

.bk-metrics { display: flex; gap: 10px; margin-bottom: 12px; }
.bk-metric {
  flex: 1; text-align: center; padding: 10px 6px; border-radius: 10px;
  background: rgba(255, 255, 255, .03); border: 1px solid var(--border, rgba(255, 255, 255, .08));
}
.bk-metric--primary { border-color: rgba(63, 185, 80, .5); background: rgba(63, 185, 80, .08); }
.bk-metric-val { display: block; font-size: 1.35rem; font-weight: 900; color: var(--text, #e6edf3); line-height: 1; }
.bk-metric--primary .bk-metric-val { color: #3fb950; }
.bk-metric-lbl { display: block; font-size: .62rem; letter-spacing: .05em; text-transform: uppercase; color: var(--text-muted, #8b949e); margin-top: 5px; }

.bk-smiles {
  display: flex; align-items: center; gap: 8px; margin-bottom: 12px;
  background: rgba(0, 0, 0, .25); border-radius: 8px; padding: 7px 9px;
}
.bk-smiles code {
  flex: 1; min-width: 0; font-family: var(--font-mono, monospace); font-size: .7rem;
  color: var(--text-muted, #c9d1d9); overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.bk-copy {
  flex-shrink: 0; border: 1px solid var(--border, rgba(255, 255, 255, .15));
  background: transparent; color: #22d3ee; font-size: .68rem; font-weight: 700;
  padding: 4px 9px; border-radius: 6px; cursor: pointer;
}
.bk-copy:hover { background: rgba(34, 211, 238, .12); }
.bk-copy.copied { color: #3fb950; border-color: rgba(63, 185, 80, .5); }

.bk-foot {
  display: flex; align-items: center; gap: 6px; flex-wrap: wrap;
  font-size: .68rem; color: var(--text-muted, #8b949e); margin-top: auto;
}
.bk-src { font-weight: 700; padding: 2px 8px; border-radius: 20px; text-transform: capitalize; }
.bk-src--human { color: #22d3ee; background: rgba(34, 211, 238, .12); }
.bk-src--agent { color: #ff8a8a; background: rgba(255, 107, 107, .12); }
.bk-src--guest, .bk-src--backfill { color: #a78bfa; background: rgba(167, 139, 250, .12); }

.bk-empty-msg {
  font-size: .82rem; color: var(--text-muted, #8b949e); text-align: center;
  padding: 30px 10px; line-height: 1.6;
}

@media (max-width: 560px) {
  .bk-grid { grid-template-columns: 1fr; }
}