/* ============================================================
   column.css — コラム一覧ページ専用
   情報メディア感・静かな知性・読みやすさ重視
   ============================================================ */

/* ── ヒーロー ── */
.col-hero {
  padding-top: calc(64px + clamp(3.5rem, 7vw, 5.5rem));
  padding-bottom: clamp(3rem, 6vw, 5rem);
  padding-left: var(--pad-x);
  padding-right: var(--pad-x);
  background: var(--white);
  border-bottom: 1px solid var(--border-light);
  position: relative;
  overflow: hidden;
}
.col-hero-bg { position: absolute; inset: 0; pointer-events: none; }
.col-hero-line {
  position: absolute;
  left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, rgba(74,144,184,.08) 30%, rgba(74,144,184,.08) 70%, transparent 100%);
}
.col-hero-line--1 { top: 25%; }
.col-hero-line--2 { top: 55%; opacity: .6; }
.col-hero-line--3 { top: 80%; opacity: .3; }

.col-hero-inner { position: relative; z-index: 1; }
.col-h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 300;
  font-family: var(--font-serif);
  color: var(--navy);
  margin-bottom: 1rem;
  line-height: 1.3;
}
.col-lead {
  font-size: clamp(.98rem, 1.4vw, 1.05rem);
  color: var(--text-mid);
  font-weight: 300;
  line-height: 2;
  max-width: 560px;
  margin-bottom: 2rem;
}

/* カテゴリナビ */
.col-cat-nav {
  display: flex;
  gap: .5rem;
  flex-wrap: wrap;
}
.col-cat-btn {
  background: var(--white);
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: clamp(.72rem, 1vw, .78rem);
  letter-spacing: .06em;
  padding: .45rem 1rem;
  cursor: pointer;
  font-family: inherit;
  transition: all var(--transition);
  border-radius: 2px;
}
.col-cat-btn:hover { border-color: var(--blue); color: var(--blue); }
.col-cat-btn.active { background: var(--navy); border-color: var(--navy); color: var(--white); }

/* ── タグ ── */
.col-tag {
  display: inline-block;
  font-size: .62rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  padding: .2rem .7rem;
  border-radius: 2px;
  font-weight: 500;
}
.col-tag--basics  { background: rgba(74,144,184,.08);  color: var(--blue); }
.col-tag--compare { background: rgba(91,163,201,.08);  color: #3a82a8; }
.col-tag--industry{ background: rgba(180,140,200,.1);  color: #6a3a8a; }
.col-tag--rental  { background: rgba(100,180,140,.1);  color: #2a6a4a; }
.col-tag--faq     { background: rgba(200,160,80,.1);   color: #7a5a10; }

.col-date {
  font-size: .7rem;
  color: var(--muted);
  font-weight: 300;
  letter-spacing: .06em;
}

/* ── フィーチャード記事 ── */
.col-featured {
  padding: clamp(2rem, 4vw, 3rem);
  border: 1px solid var(--border-light);
  background: var(--off-white);
  margin-bottom: clamp(2rem, 4vw, 3rem);
  position: relative;
  overflow: hidden;
  transition: box-shadow var(--transition);
}
.col-featured::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 4px; height: 100%;
  background: linear-gradient(to bottom, var(--blue), var(--blue-light));
}
.col-featured:hover { box-shadow: var(--shadow-md); }
.col-featured-meta {
  display: flex;
  align-items: center;
  gap: .8rem;
  margin-bottom: 1rem;
}
.col-featured-title {
  font-family: var(--font-serif);
  font-size: clamp(1.2rem, 2.5vw, 1.7rem);
  font-weight: 300;
  color: var(--navy);
  line-height: 1.45;
  margin-bottom: 1rem;
}
.col-featured-title a {
  color: inherit;
  transition: color var(--transition);
}
.col-featured-title a:hover { color: var(--blue); }
.col-featured-excerpt {
  font-size: clamp(.9rem, 1.3vw, .97rem);
  color: var(--text-mid);
  font-weight: 300;
  line-height: 1.9;
  max-width: 640px;
  margin-bottom: 1.2rem;
}

/* ── 記事グリッド ── */
.col-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1rem, 2vw, 1.6rem);
  margin-bottom: 1.5rem;
  transition: opacity .2s ease;
}
.col-card {
  border: 1px solid var(--border-light);
  background: var(--white);
  padding: 1.6rem;
  display: flex;
  flex-direction: column;
  gap: .8rem;
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}
.col-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: var(--blue-light);
}
.col-card-meta {
  display: flex;
  align-items: center;
  gap: .6rem;
}
.col-card-title {
  font-family: var(--font-serif);
  font-size: clamp(1rem, 1.6vw, 1.1rem);
  font-weight: 300;
  color: var(--navy);
  line-height: 1.55;
  flex: 1;
}
.col-card-title a {
  color: inherit;
  transition: color var(--transition);
}
.col-card-title a:hover { color: var(--blue); }
.col-card-excerpt {
  font-size: clamp(.82rem, 1.1vw, .88rem);
  color: var(--muted);
  font-weight: 300;
  line-height: 1.8;
  flex: 1;
}
.col-read-more {
  font-size: .78rem;
  color: var(--blue);
  letter-spacing: .08em;
  transition: color var(--transition);
  margin-top: auto;
  align-self: flex-start;
}
.col-read-more:hover { color: var(--blue-mid); }

.col-coming-soon {
  text-align: center;
  font-size: .8rem;
  color: var(--muted);
  font-weight: 300;
  margin-top: 2rem;
  letter-spacing: .08em;
}

/* ── カテゴリカード ── */
.col-cat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}
.col-cat-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  grid-template-rows: auto auto;
  align-items: start;
  gap: .3rem .8rem;
  padding: 1.3rem 1.4rem;
  border: 1px solid var(--border-light);
  background: var(--white);
  text-align: left;
  cursor: pointer;
  font-family: inherit;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.col-cat-card:hover {
  border-color: var(--blue-light);
  box-shadow: var(--shadow-sm);
}
.col-cat-card-icon {
  grid-row: 1 / 3;
  font-size: 1.3rem;
  align-self: center;
}
.col-cat-card-name {
  font-size: clamp(.9rem, 1.3vw, .95rem);
  font-weight: 500;
  color: var(--navy);
  line-height: 1.4;
}
.col-cat-card-desc {
  font-size: .78rem;
  color: var(--muted);
  font-weight: 300;
  line-height: 1.6;
}
.col-cat-card-arrow {
  grid-row: 1 / 3;
  align-self: center;
  color: var(--blue);
  font-size: .9rem;
}

/* ── WEZUの考え方 ── */
.col-philosophy { background: var(--white); }

/* ── FAQ導線 ── */
.col-nav-grid {
  display: flex;
  flex-direction: column;
  gap: .8rem;
  margin-top: 1.5rem;
}
.col-nav-card {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  padding: 1.2rem 1.5rem;
  border: 1px solid var(--border-light);
  background: var(--white);
  text-decoration: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.col-nav-card:hover {
  border-color: var(--blue-light);
  box-shadow: var(--shadow-sm);
}
.col-nav-icon { font-size: 1.3rem; flex-shrink: 0; }
.col-nav-title {
  font-size: clamp(.92rem, 1.3vw, .98rem);
  font-weight: 500;
  color: var(--navy);
  margin-bottom: .2rem;
}
.col-nav-desc {
  font-size: .8rem;
  color: var(--muted);
  font-weight: 300;
  line-height: 1.6;
}
.col-nav-arrow {
  margin-left: auto;
  color: var(--blue);
  font-size: .9rem;
  flex-shrink: 0;
}

/* ── CTA ── */
.col-cta {
  background: var(--navy);
  padding: clamp(4rem, 8vw, 7rem) var(--pad-x);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.col-cta::before {
  content: '';
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 600px; height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(74,144,184,.1) 0%, transparent 65%);
  pointer-events: none;
}
.col-cta-inner { position: relative; z-index: 1; }
.col-cta h2 { color: var(--white); font-size: clamp(1.4rem, 3vw, 2.2rem); }
.col-cta p {
  color: rgba(255,255,255,.6);
  font-size: clamp(.95rem, 1.4vw, 1.05rem);
  font-weight: 300;
  line-height: 2;
  max-width: 460px;
  margin: 0 auto;
}
.col-cta-btns { display: flex; gap: .8rem; justify-content: center; flex-wrap: wrap; }
.col-cta .btn-primary { background: var(--white); color: var(--navy); border-color: var(--white); }
.col-cta .btn-primary:hover { background: var(--blue-pale); border-color: var(--blue-pale); }
.col-cta .btn-outline { border-color: rgba(255,255,255,.3); color: rgba(255,255,255,.8); }
.col-cta .btn-outline:hover { border-color: var(--white); color: var(--white); }
.col-cta-note { margin-top: 1.5rem; font-size: .74rem; color: rgba(255,255,255,.28); letter-spacing: .06em; }

/* ── Responsive ── */
@media (max-width: 640px) {
  .col-cat-nav { overflow-x: auto; scrollbar-width: none; flex-wrap: nowrap; padding-bottom: .5rem; }
  .col-cat-nav::-webkit-scrollbar { display: none; }
  .col-cat-btn { white-space: nowrap; flex-shrink: 0; }
  .col-grid { grid-template-columns: 1fr; }
  .col-cat-grid { grid-template-columns: 1fr; }
  .col-cta-btns { flex-direction: column; align-items: center; }
}

/* ── 動画グリッド（3カラム） ── */
.col-video-section {
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
  padding: clamp(1.8rem, 3.5vw, 2.8rem);
  border: 1px solid var(--border-light);
  background: var(--off-white);
}
.col-video-title {
  font-family: var(--font-serif);
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  font-weight: 300;
  color: var(--navy);
  margin-bottom: .6rem;
}
.col-video-desc {
  font-size: clamp(.85rem, 1.2vw, .92rem);
  color: var(--text-mid);
  font-weight: 300;
  line-height: 1.8;
  margin-bottom: 1.5rem;
}
.col-video-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1rem, 2vw, 1.5rem);
  margin-bottom: 1rem;
}
.col-video-item {}
.col-video-wrap {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  background: var(--navy);
}
.col-video-wrap iframe {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
}
.col-video-num {
  font-size: .72rem;
  color: var(--muted);
  letter-spacing: .08em;
  margin-top: .4rem;
  text-align: center;
}
.col-video-note {
  font-size: .72rem;
  color: var(--muted);
  font-weight: 300;
  letter-spacing: .04em;
  margin-top: .5rem;
}


/* ── 件数表示 ── */
.col-count {
  font-size: .78rem;
  color: var(--muted);
  letter-spacing: .06em;
  font-weight: 300;
  margin-bottom: .4rem;
}

/* ── Responsive 追記 ── */
@media (max-width: 960px) {
  .col-grid { grid-template-columns: repeat(2, 1fr); }
  .col-video-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .col-grid { grid-template-columns: 1fr; }
  .col-video-grid { grid-template-columns: 1fr; }
}

.col-tag--research { background: rgba(100,140,200,.1); color: #3a5a9a; }

/* ── §6：初めての方おすすめ ── */
.col-beginner-section {
  margin-bottom: clamp(2rem, 4vw, 3rem);
  padding: 1.6rem 2rem;
  background: var(--off-white);
  border: 1px solid var(--border-light);
  border-left: 3px solid var(--navy);
}
.col-beginner-label {
  font-size: .7rem;
  letter-spacing: .16em;
  color: var(--navy);
  font-weight: 500;
  margin-bottom: 1rem;
}
.col-beginner-cards {
  display: flex;
  gap: .6rem;
  flex-wrap: wrap;
}
.col-beginner-card {
  display: flex;
  align-items: center;
  gap: .5rem;
  padding: .55rem 1rem;
  border: 1px solid var(--border);
  background: var(--white);
  text-decoration: none;
  transition: border-color var(--transition), color var(--transition);
  font-size: clamp(.8rem, 1.2vw, .86rem);
  color: var(--navy);
  font-weight: 300;
}
.col-beginner-card:hover { border-color: var(--blue); color: var(--blue); }
.col-beginner-num {
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--blue-light);
  font-weight: 300;
  flex-shrink: 0;
}
.col-beginner-title { font-weight: 400; }

@media (max-width: 640px) {
  .col-beginner-section { padding: 1.2rem 1.4rem; }
  .col-beginner-cards { flex-direction: column; }
  .col-beginner-card { width: 100%; }
}