/* ══════════════════════════════════════════
   cards.css — 記事カードグリッド
   column/index.html で読み込む
   ══════════════════════════════════════════ */

/* ── PAGE HEADER ── */
.page-header {
  padding: 120px 24px 64px;
  background: radial-gradient(ellipse 70% 50% at 50% -10%, rgba(233,69,96,0.14) 0%, transparent 70%), var(--ink);
  text-align: center;
}
.page-header .label {
  font-size: 0.72rem; font-weight: 700; letter-spacing: 0.18em;
  color: var(--accent); text-transform: uppercase; margin-bottom: 12px;
}
.page-header h1 {
  font-family: 'Noto Serif JP', serif;
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 700; line-height: 1.4; letter-spacing: 0.04em;
  margin-bottom: 14px;
}
.page-header p { color: rgba(255,255,255,0.6); font-size: 0.95rem; max-width: 480px; margin: 0 auto; }

/* ── CATEGORY FILTER ── */
.cat-filter {
  display: flex; flex-wrap: wrap; gap: 8px;
  justify-content: center; margin-bottom: 8px;
}
.cat-btn {
  background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.55); font-size: 0.8rem; font-weight: 500;
  padding: 7px 18px; border-radius: 50px; cursor: pointer;
  transition: all 0.2s; letter-spacing: 0.03em;
}
.cat-btn:hover {
  border-color: rgba(233,69,96,0.35); color: rgba(255,255,255,0.8);
  background: rgba(233,69,96,0.08);
}
.cat-btn.active {
  background: rgba(233,69,96,0.15); border-color: rgba(233,69,96,0.5);
  color: #ff6b84; font-weight: 700;
}

/* ── CONTAINER ── */
.container { max-width: 900px; margin: 0 auto; padding: 64px 24px 96px; }
.container + .container { padding-top: 0; }

/* ── ARTICLE GRID ── */
.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
  gap: 24px;
}
.article-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  text-decoration: none; color: var(--white);
  display: flex; flex-direction: column;
  transition: transform 0.2s, border-color 0.2s;
  overflow: hidden;
}
.article-card:hover { transform: translateY(-4px); border-color: rgba(233,69,96,0.3); }
.card-thumb {
  height: 140px;
  background: linear-gradient(135deg, rgba(233,69,96,0.15) 0%, rgba(15,52,96,0.5) 100%);
  display: flex; align-items: center; justify-content: center;
  font-size: 3rem; position: relative;
}
.card-body { padding: 24px 22px; flex: 1; display: flex; flex-direction: column; gap: 10px; }
.card-meta { display: flex; gap: 10px; align-items: center; }
.card-cat {
  background: rgba(233,69,96,0.15); border: 1px solid rgba(233,69,96,0.3);
  color: #ff6b84; font-size: 0.7rem; font-weight: 700; letter-spacing: 0.08em;
  padding: 3px 10px; border-radius: 50px;
}
.card-date { font-size: 0.75rem; color: var(--muted); }
.card-title {
  font-family: 'Noto Serif JP', serif;
  font-size: 1.05rem; font-weight: 700; line-height: 1.55; letter-spacing: 0.02em;
}
.card-desc { font-size: 0.86rem; color: rgba(255,255,255,0.58); line-height: 1.8; flex: 1; }
.card-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 4px; }
.card-tag {
  font-size: 0.72rem; padding: 2px 10px; border-radius: 50px;
  background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.5);
}
.card-arrow { font-size: 0.8rem; color: var(--accent); margin-top: 14px; }

/* ── FILTER COUNT ── */
.filter-count {
  text-align: center; font-size: 0.78rem; color: var(--muted);
  margin-top: 12px; letter-spacing: 0.04em;
}

/* ── POPULAR ARTICLES ── */
.popular-section {
  background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius); padding: 28px 28px 20px;
}
.popular-label {
  font-size: 0.72rem; font-weight: 700; letter-spacing: 0.12em;
  color: var(--gold); text-transform: uppercase; margin-bottom: 16px;
}
.popular-list { display: flex; flex-direction: column; gap: 0; }
.popular-item {
  display: flex; align-items: center; gap: 14px;
  padding: 12px 0; text-decoration: none;
  border-bottom: 1px solid rgba(255,255,255,0.05);
  transition: background 0.2s;
}
.popular-item:last-child { border-bottom: none; }
.popular-item:hover { background: rgba(255,255,255,0.03); }
.popular-rank {
  width: 28px; height: 28px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.78rem; font-weight: 800; flex-shrink: 0;
  background: rgba(245,166,35,0.15); border: 1px solid rgba(245,166,35,0.3);
  color: var(--gold);
}
.popular-item:nth-child(1) .popular-rank {
  background: linear-gradient(135deg, rgba(245,166,35,0.3), rgba(245,166,35,0.1));
  border-color: rgba(245,166,35,0.5);
}
.popular-title {
  font-size: 0.88rem; color: rgba(255,255,255,0.75);
  line-height: 1.5; font-weight: 500;
}
.popular-item:hover .popular-title { color: var(--white); }

/* ── COLUMN PAGE CTA ── */
.column-cta {
  background: linear-gradient(135deg, rgba(233,69,96,0.1), rgba(26,26,46,0.95));
  border: 2px solid rgba(233,69,96,0.25);
  border-radius: 16px; padding: 48px 36px; text-align: center;
}
.column-cta-label {
  font-size: 0.72rem; font-weight: 700; letter-spacing: 0.14em;
  color: var(--accent); margin-bottom: 14px;
}
.column-cta h2 {
  font-family: 'Noto Serif JP', serif;
  font-size: 1.3rem; font-weight: 700; line-height: 1.6;
  margin-bottom: 12px; letter-spacing: 0.04em;
}
.column-cta p {
  font-size: 0.9rem; color: rgba(255,255,255,0.6);
  line-height: 1.9; margin-bottom: 28px;
}
.column-cta-btn {
  display: inline-block;
  background: linear-gradient(135deg, var(--accent), #c7253e);
  color: var(--white); font-size: 1rem; font-weight: 800;
  padding: 16px 40px; border-radius: 50px; text-decoration: none;
  box-shadow: 0 6px 24px rgba(233,69,96,0.4);
  transition: transform 0.2s, box-shadow 0.2s;
}
.column-cta-btn:hover { transform: translateY(-3px); box-shadow: 0 12px 32px rgba(233,69,96,0.55); }
.column-cta small { display: block; font-size: 0.75rem; color: var(--muted); margin-top: 12px; }

/* ── FILTER ANIMATION ── */
.article-card { transition: transform 0.2s, border-color 0.2s, opacity 0.3s; }
.article-card.hidden { display: none; }

@media (max-width: 620px) {
  .article-grid { grid-template-columns: 1fr; }
  .cat-filter { gap: 6px; }
  .cat-btn { font-size: 0.74rem; padding: 6px 14px; }
  .popular-section { padding: 20px 18px 14px; }
  .popular-title { font-size: 0.82rem; }
  .column-cta { padding: 32px 20px; }
}