/* ==========================================================================
   Seiryu Blog Cards
   ショートコード: [seiryu_blog_cards]
   ========================================================================== */

/* ---- グリッドコンテナ ---- */
.seiryu-blog-cards {
  display: grid;
  gap: 1.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.seiryu-blog-cards--cols-6 { grid-template-columns: repeat(6, 1fr); }
.seiryu-blog-cards--cols-5 { grid-template-columns: repeat(5, 1fr); }
.seiryu-blog-cards--cols-4 { grid-template-columns: repeat(4, 1fr); }
.seiryu-blog-cards--cols-3 { grid-template-columns: repeat(3, 1fr); }
.seiryu-blog-cards--cols-2 { grid-template-columns: repeat(2, 1fr); }
.seiryu-blog-cards--cols-1 { grid-template-columns: 1fr; }

/* ---- カード本体 ---- */
.seiryu-bc {
  background: #fff;
  border: 1px solid var(--seiryu-color-border, #e2e8f0);
  border-radius: var(--seiryu-radius-lg, 16px);
  overflow: hidden;
  transition: transform 0.28s ease, box-shadow 0.28s ease, border-color 0.28s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  position: relative;
}

.seiryu-bc::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(
    90deg,
    var(--seiryu-color-primary, #1a3a5c),
    var(--seiryu-color-primary-light, #2563a8)
  );
  opacity: 0;
  transition: opacity 0.28s ease;
  z-index: 1;
  border-radius: var(--seiryu-radius-lg, 16px) var(--seiryu-radius-lg, 16px) 0 0;
}

.seiryu-bc:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.12);
  border-color: var(--seiryu-color-primary-light, #2563a8);
}

.seiryu-bc:hover::before {
  opacity: 1;
}

/* ---- リンク（カード全体をクリック可能に） ---- */
.seiryu-bc__link {
  display: flex;
  flex-direction: column;
  height: 100%;
  text-decoration: none;
  color: inherit;
  outline: none;
}

.seiryu-bc__link:focus-visible {
  outline: 2px solid var(--seiryu-color-primary-light, #2563a8);
  outline-offset: 2px;
  border-radius: var(--seiryu-radius-lg, 16px);
}

/* ---- サムネイル ---- */
.seiryu-bc__thumb {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--seiryu-color-bg-alt, #f7f8fa);
  flex-shrink: 0;
}

.seiryu-bc__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s ease;
}

.seiryu-bc:hover .seiryu-bc__thumb img {
  transform: scale(1.06);
}

/* サムネイルなし */
.seiryu-bc__no-thumb {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--seiryu-color-border, #e2e8f0);
}

.seiryu-bc__no-thumb svg {
  width: 40%;
  height: 40%;
}

/* ---- カテゴリバッジ ---- */
.seiryu-bc__cat {
  position: absolute;
  top: 0.6rem;
  left: 0.6rem;
  background: var(--seiryu-color-primary, #1a3a5c);
  color: #fff;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 0.2rem 0.55rem;
  border-radius: var(--seiryu-radius-full, 9999px);
  white-space: nowrap;
  z-index: 2;
  line-height: 1.5;
}

/* ---- テキスト本体 ---- */
.seiryu-bc__body {
  padding: 0.85rem 1rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  flex: 1;
}

/* ---- 日付 ---- */
.seiryu-bc__date {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.7rem;
  color: var(--seiryu-color-text-muted, #6b7280);
  font-weight: 500;
  letter-spacing: 0.02em;
}

.seiryu-bc__date-icon {
  width: 0.85rem;
  height: 0.85rem;
  flex-shrink: 0;
}

/* ---- タイトル ---- */
.seiryu-bc__title {
  font-size: 0.82rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--seiryu-color-text, #1a1a1a);
  font-family: var(--seiryu-font-heading);
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color 0.2s ease;
}

.seiryu-bc:hover .seiryu-bc__title {
  color: var(--seiryu-color-primary-light, #2563a8);
}

/* ---- 抜粋 ---- */
.seiryu-bc__excerpt {
  font-size: 0.72rem;
  line-height: 1.65;
  color: var(--seiryu-color-text-muted, #6b7280);
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}

/* ---- 続きを読む ---- */
.seiryu-bc__more {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--seiryu-color-primary-light, #2563a8);
  letter-spacing: 0.04em;
  margin-top: auto;
  transition: gap 0.2s ease;
}

.seiryu-bc__more svg {
  width: 0.9rem;
  height: 0.9rem;
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.seiryu-bc:hover .seiryu-bc__more {
  gap: 0.5rem;
}

.seiryu-bc:hover .seiryu-bc__more svg {
  transform: translateX(3px);
}

/* ==========================================================================
   レスポンシブ
   ========================================================================== */

/* タブレット: 3列 */
@media (max-width: 1199px) {
  .seiryu-blog-cards--cols-6,
  .seiryu-blog-cards--cols-5 {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* 中間タブレット: 2列（cols-4 以上は3列キープ、cols-3以上） */
@media (max-width: 899px) {
  .seiryu-blog-cards--cols-6,
  .seiryu-blog-cards--cols-5,
  .seiryu-blog-cards--cols-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* スマホ: 2列 */
@media (max-width: 767px) {
  .seiryu-blog-cards--cols-6,
  .seiryu-blog-cards--cols-5,
  .seiryu-blog-cards--cols-4,
  .seiryu-blog-cards--cols-3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .seiryu-blog-cards {
    gap: 0.875rem;
  }

  .seiryu-bc__body {
    padding: 0.75rem 0.75rem 0.875rem;
    gap: 0.4rem;
  }

  .seiryu-bc__title {
    font-size: 0.78rem;
  }

  .seiryu-bc__excerpt {
    -webkit-line-clamp: 2;
  }
}

/* 極小スマホ: 1列 */
@media (max-width: 399px) {
  .seiryu-blog-cards--cols-6,
  .seiryu-blog-cards--cols-5,
  .seiryu-blog-cards--cols-4,
  .seiryu-blog-cards--cols-3,
  .seiryu-blog-cards--cols-2 {
    grid-template-columns: 1fr;
  }
}