/* column.html 전용 — 필터·인덱스·카드 그리드 */
.filter-section { max-width: 1100px; margin: 2rem auto 0; padding: 0 2rem; }
.cat-bar { display: flex; gap: 0.5rem; flex-wrap: wrap; align-items: center; margin-bottom: 0.6rem; }
.cat-btn {
  padding: 0.4rem 1.2rem; background: rgba(18, 8, 46, 0.6);
  border: 1px solid var(--border); color: var(--muted);
  font-size: 12px; font-family: var(--font-body); cursor: pointer;
  letter-spacing: 0.08em; text-transform: uppercase; transition: all 0.15s;
}
.cat-btn:hover { border-color: var(--accent); color: var(--accent); box-shadow: var(--glow-cyan); }
.cat-btn.active { background: var(--accent2); border-color: var(--accent2); color: #fff; box-shadow: var(--glow-pink); }
.detail-wrap { display: none; }
.detail-bar { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-top: 0.5rem; }
.tag-btn {
  padding: 2px 10px; border: 1px solid var(--border); background: transparent;
  color: var(--muted); font-size: 11px; font-family: inherit; cursor: pointer; transition: all 0.15s;
}
.tag-btn:hover, .tag-btn.active { border-color: var(--accent3); color: var(--accent3); }
.tag-toggle {
  background: none; border: none; color: var(--muted); font-size: 11px;
  font-family: inherit; cursor: pointer; padding: 0.4rem 0; letter-spacing: 0.04em;
}
.tag-toggle:hover { color: var(--accent); }
.col-index { max-width: 1100px; margin: 0 auto; padding: 1.5rem 2rem 0; }
.idx-toggle {
  width: 100%; text-align: left; background: var(--surface);
  border: 1px solid var(--border); padding: 0.7rem 1.1rem;
  font-family: var(--font-body); font-size: 13px; font-weight: 500;
  color: var(--ink); cursor: pointer; display: flex; align-items: center; gap: 0.6rem;
}
.idx-toggle:hover { border-color: var(--accent); box-shadow: var(--glow-cyan); }
.idx-count { font-size: 11px; color: var(--accent); }
.idx-arrow { margin-left: auto; font-size: 11px; color: var(--muted); transition: transform 0.2s; }
.col-index.open .idx-arrow { transform: rotate(180deg); }
.idx-list { display: none; list-style: none; margin: 0; border: 1px solid var(--border); border-top: none; background: var(--light); }
.col-index.open .idx-list { display: block; }
.idx-row {
  display: flex; align-items: baseline; gap: 0.9rem; padding: 0.55rem 1.1rem;
  border-bottom: 1px solid var(--border); cursor: pointer; transition: background 0.12s;
}
.idx-row:last-child { border-bottom: none; }
.idx-row:hover { background: var(--surface2); }
.idx-row:hover .idx-title { color: var(--accent2); }
.idx-date { font-family: var(--font-mono); font-size: 10.5px; color: var(--muted); flex-shrink: 0; width: 82px; }
.idx-title { font-family: var(--font-body); font-size: 13.5px; font-weight: 600; color: var(--ink); line-height: 1.5; }
.idx-tags { margin-left: auto; display: flex; gap: 0.3rem; flex-shrink: 0; }
.idx-tag { font-size: 10px; color: var(--muted); border: 1px solid var(--border); padding: 1px 7px; }
.idx-row.col-hidden { display: none; }
.col-list { max-width: 1100px; margin: 0 auto; padding: 3rem 2rem 4rem; display: flex; flex-direction: column; gap: 0; }
.col-item {
  display: grid; grid-template-columns: 1fr 1fr;
  border: 1px solid var(--border); border-bottom: none;
  background: rgba(18, 8, 46, 0.5); transition: box-shadow 0.2s, border-color 0.2s;
}
.col-item:last-child { border-bottom: 1px solid var(--border); }
.col-item:hover { box-shadow: var(--glow-pink); border-color: rgba(255, 42, 109, 0.5); }
.col-visual { min-height: 320px; position: relative; overflow: hidden; }
.col-visual img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform 0.5s; filter: saturate(1.15) contrast(1.05); }
.col-item:hover .col-visual img { transform: scale(1.04); }
.col-visual-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(7, 1, 26, 0.85) 0%, rgba(255, 42, 109, 0.15) 50%, transparent 100%);
  pointer-events: none;
}
.col-visual-num {
  position: absolute; bottom: 1rem; left: 1.2rem; font-size: 4.5rem; font-weight: 700;
  color: rgba(5, 217, 232, 0.15); line-height: 1; font-family: var(--font-display);
  letter-spacing: -0.04em; user-select: none;
}
.col-text { padding: 2.8rem 2.5rem; display: flex; flex-direction: column; background: transparent; }
.col-num-row { display: flex; align-items: baseline; gap: 0.6rem; margin-bottom: 1rem; }
.col-num { font-size: 2rem; font-weight: 700; color: var(--border); font-family: var(--font-display); line-height: 1; }
.col-cat { font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase; font-weight: 500; }
.col-title { font-family: var(--font-body); font-size: 1.2rem; font-weight: 700; color: var(--ink); line-height: 1.5; margin-bottom: 1rem; }
.col-excerpt { font-size: 13px; color: var(--muted); line-height: 1.9; margin-bottom: 1.2rem; flex: 1; }
.col-meta-row { display: flex; align-items: center; gap: 0.8rem; margin-bottom: 1.2rem; flex-wrap: wrap; }
.col-date { font-size: 11px; color: var(--muted); font-family: var(--font-mono); }
.col-tag-chip { font-size: 10px; padding: 1px 8px; letter-spacing: 0.03em; border: 1px solid; }
.col-more {
  align-self: flex-start; background: transparent; border: 1px solid var(--border);
  color: var(--text); font-size: 11px; font-family: inherit; letter-spacing: 0.1em;
  text-transform: uppercase; padding: 0.5rem 1.2rem; cursor: pointer; transition: all 0.2s;
}
.col-more:hover { border-color: var(--accent2); color: var(--accent2); box-shadow: var(--glow-pink); }
.col-hidden { display: none !important; }
@media (max-width: 800px) {
  .col-item { grid-template-columns: 1fr; }
  .col-visual { min-height: 220px; order: -1; }
  .col-visual-num { font-size: 3rem; }
  .col-text { padding: 1.8rem 1.5rem; }
  .col-num { font-size: 1.6rem; }
  .page-header { padding: 3rem 1.5rem 2rem; }
}
@media (max-width: 640px) {
  .idx-row { flex-wrap: wrap; gap: 0.3rem 0.7rem; padding: 0.65rem 0.9rem; }
  .idx-tags { margin-left: 0; width: 100%; flex-wrap: wrap; }
  .idx-date { width: auto; }
}
@media (max-width: 600px) {
  .page-header { padding: 2.2rem 1.2rem 1.5rem; }
  .page-header-title { font-size: 2rem; letter-spacing: 0.12em; }
  .filter-section { padding: 0 1.2rem; margin: 1.2rem auto 0; }
  .col-list { padding: 1.5rem 1.2rem 3rem; }
  .col-visual { min-height: 180px; }
  .col-text { padding: 1.3rem 1.1rem; }
  .col-title { font-size: 1.05rem; }
}