/* ============================================
   Column (SEO articles) — shared styles
   ============================================ */

/* === Listing page === */
.col-hero {
  padding: 140px 0 64px;
  background: linear-gradient(180deg, var(--brand-blue-tint) 0%, #fff 100%);
  text-align: center;
}
.col-hero-inner { max-width: 920px; margin: 0 auto; padding: 0 20px; }
.col-hero-eyebrow {
  font-size: 0.78rem; font-weight: 700; letter-spacing: 0.18em;
  color: var(--brand-blue); margin-bottom: 14px;
}
.col-hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800; line-height: 1.35;
  color: var(--ink); letter-spacing: -0.01em;
  margin-bottom: 18px;
}
.col-hero p {
  font-size: 1.02rem; line-height: 1.95;
  color: var(--text-sub); max-width: 720px; margin: 0 auto;
}
.col-list-section {
  padding: 64px 0 100px;
  background: var(--bg);
}
.col-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
.col-card {
  display: flex; flex-direction: column;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  overflow: hidden;
  transition: transform 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out), border-color 0.3s var(--ease-out);
}
.col-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--brand-blue);
}
.col-card-thumb {
  aspect-ratio: 3 / 2;
  overflow: hidden;
  background: var(--bg-muted);
}
.col-card-thumb img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.5s var(--ease-out);
}
.col-card:hover .col-card-thumb img { transform: scale(1.05); }
.col-card-body {
  padding: 24px 22px 26px;
  display: flex; flex-direction: column;
  flex: 1;
}
.col-card-tag {
  display: inline-block;
  font-size: 0.7rem; font-weight: 700; letter-spacing: 0.1em;
  color: var(--brand-blue); background: var(--brand-blue-soft);
  padding: 4px 10px; border-radius: var(--r-pill);
  margin-bottom: 12px;
  align-self: flex-start;
}
.col-card-title {
  font-size: 1.05rem; font-weight: 700;
  line-height: 1.55; color: var(--ink);
  margin-bottom: 12px;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical;
  overflow: hidden;
}
.col-card-excerpt {
  font-size: 0.86rem; line-height: 1.75;
  color: var(--text-sub); flex: 1;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical;
  overflow: hidden;
}
.col-card-meta {
  display: flex; align-items: center;
  font-size: 0.75rem; color: var(--text-mute);
  margin-top: 16px; padding-top: 14px;
  border-top: 1px solid var(--border-soft);
}
.col-card-meta time { font-weight: 500; }

/* === Article page === */
.art-hero {
  padding: 130px 0 40px;
  background: linear-gradient(180deg, var(--brand-blue-tint) 0%, #fff 100%);
}
.art-hero-inner { max-width: 880px; margin: 0 auto; padding: 0 20px; }
.art-breadcrumb {
  display: flex; gap: 6px; align-items: center;
  font-size: 0.78rem; color: var(--text-mute); margin-bottom: 20px; flex-wrap: wrap;
}
.art-breadcrumb a { color: var(--text-sub); }
.art-breadcrumb a:hover { color: var(--brand-blue); }
.art-breadcrumb .sep::before { content: '/'; margin: 0 6px; color: var(--border); }
.art-tag {
  display: inline-block;
  font-size: 0.72rem; font-weight: 700; letter-spacing: 0.12em;
  color: var(--brand-blue); background: var(--brand-blue-soft);
  padding: 5px 12px; border-radius: var(--r-pill);
  margin-bottom: 18px;
}
.art-title {
  font-size: clamp(1.75rem, 3.6vw, 2.6rem);
  font-weight: 800; line-height: 1.45;
  color: var(--ink); letter-spacing: -0.01em;
  margin-bottom: 22px;
}
.art-meta {
  display: flex; gap: 18px; flex-wrap: wrap;
  font-size: 0.85rem; color: var(--text-sub); margin-bottom: 32px;
}
.art-meta-item { display: flex; align-items: center; gap: 6px; }
.art-meta-item strong { color: var(--ink); font-weight: 600; }
.art-hero-img {
  width: 100%; aspect-ratio: 3 / 2;
  border-radius: var(--r-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  background: var(--bg-muted);
}
.art-hero-img img { width: 100%; height: 100%; object-fit: cover; display: block; }

.art-body {
  max-width: 760px; margin: 0 auto;
  padding: 56px 20px 80px;
}
.art-lead {
  font-size: 1.02rem; line-height: 2.05;
  color: var(--text); margin-bottom: 48px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border-soft);
}
.art-toc {
  background: var(--bg-soft);
  border: 1px solid var(--border-soft);
  border-radius: var(--r-lg);
  padding: 24px 28px;
  margin-bottom: 56px;
}
.art-toc h3 {
  font-size: 0.78rem; font-weight: 700; letter-spacing: 0.14em;
  color: var(--brand-blue); margin-bottom: 14px;
}
.art-toc ol {
  list-style: none; counter-reset: toc-counter;
  padding: 0; margin: 0;
}
.art-toc li {
  counter-increment: toc-counter;
  padding: 6px 0;
  font-size: 0.92rem;
  line-height: 1.65;
}
.art-toc li::before {
  content: counter(toc-counter, decimal-leading-zero);
  display: inline-block;
  width: 32px; color: var(--brand-blue);
  font-weight: 700; font-feature-settings: "tnum";
}
.art-toc a { color: var(--text); transition: color 0.2s; }
.art-toc a:hover { color: var(--brand-blue); }

.art-body h2 {
  font-size: clamp(1.35rem, 2.2vw, 1.6rem);
  font-weight: 800; line-height: 1.55;
  color: var(--ink);
  margin: 56px 0 22px;
  padding-top: 20px;
  border-top: 3px solid var(--brand-navy);
  position: relative;
}
.art-body h2:first-of-type { margin-top: 0; }
.art-body h3 {
  font-size: clamp(1.1rem, 1.7vw, 1.22rem);
  font-weight: 700; line-height: 1.6;
  color: var(--ink-700);
  margin: 36px 0 14px;
  padding-left: 14px;
  border-left: 4px solid var(--brand-blue);
}
.art-body p {
  font-size: 0.98rem; line-height: 2.05;
  color: var(--text); margin-bottom: 18px;
}
.art-body ul, .art-body ol {
  margin: 0 0 22px 0;
  padding-left: 0;
  list-style: none;
}
.art-body ul li, .art-body ol li {
  position: relative;
  padding: 6px 0 6px 26px;
  font-size: 0.96rem; line-height: 1.95;
  color: var(--text);
}
.art-body ul li::before {
  content: ''; position: absolute;
  left: 8px; top: 16px;
  width: 6px; height: 6px;
  background: var(--brand-blue);
  border-radius: 50%;
}
.art-body ol { counter-reset: list-counter; }
.art-body ol li {
  counter-increment: list-counter;
  padding-left: 32px;
}
.art-body ol li::before {
  content: counter(list-counter) ".";
  position: absolute; left: 4px; top: 6px;
  color: var(--brand-blue); font-weight: 700;
}
.art-body strong { color: var(--ink); font-weight: 700; }
.art-body a {
  color: var(--brand-blue);
  text-decoration: underline;
  text-decoration-color: var(--brand-blue-soft);
  text-underline-offset: 3px;
  transition: text-decoration-color 0.2s;
}
.art-body a:hover { text-decoration-color: var(--brand-blue); }

.art-callout {
  background: var(--brand-blue-tint);
  border-left: 4px solid var(--brand-blue);
  padding: 20px 24px;
  margin: 28px 0;
  border-radius: 0 var(--r-md) var(--r-md) 0;
}
.art-callout p { font-size: 0.93rem; line-height: 1.95; margin: 0; color: var(--ink-700); }
.art-callout strong { color: var(--brand-navy); }

.art-table-wrap { overflow-x: auto; margin: 24px 0 28px; }
.art-table {
  width: 100%; border-collapse: collapse;
  font-size: 0.9rem;
}
.art-table th, .art-table td {
  padding: 12px 14px; text-align: left;
  border-bottom: 1px solid var(--border);
}
.art-table th {
  background: var(--bg-soft);
  font-weight: 700; color: var(--ink);
  font-size: 0.84rem;
}
.art-table tr:hover td { background: var(--bg-soft); }

.art-summary {
  margin-top: 64px;
  background: var(--bg-soft);
  border: 1px solid var(--border-soft);
  border-radius: var(--r-lg);
  padding: 28px 30px;
}
.art-summary h3 {
  font-size: 0.78rem; font-weight: 700; letter-spacing: 0.14em;
  color: var(--brand-blue); margin-bottom: 16px;
  padding: 0; border: none;
}
.art-summary ul li { font-size: 0.92rem; }

.art-bridge {
  margin-top: 56px;
  padding: 0 0 8px;
}
.art-bridge h3 {
  font-size: 1.2rem; font-weight: 800;
  color: var(--ink); margin-bottom: 18px;
  padding: 0; border: none;
}
.art-bridge p {
  font-size: 0.98rem; line-height: 2.05;
  color: var(--text);
  margin-bottom: 18px;
}

.art-cta {
  margin-top: 40px; padding: 48px 40px;
  background: linear-gradient(135deg, var(--brand-navy) 0%, var(--brand-blue) 100%);
  border-radius: var(--r-xl); color: #fff; text-align: center;
  position: relative; overflow: hidden;
}
.art-cta::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse at top right, rgba(245, 180, 0, 0.18), transparent 60%);
  pointer-events: none;
}
.art-cta-inner { position: relative; }
.art-cta h3 {
  font-size: clamp(1.3rem, 2.4vw, 1.65rem);
  font-weight: 800; margin-bottom: 14px; line-height: 1.55;
  color: #fff; padding: 0; border: none;
}
.art-cta h3 .gold { color: var(--gold); }
.art-cta p {
  font-size: 0.96rem; line-height: 1.9;
  margin-bottom: 28px; opacity: 0.95;
  color: #fff;
}
.art-cta .btn {
  display: inline-block;
  background: var(--gold); color: var(--brand-navy);
  font-weight: 700;
}
.art-cta .btn:hover {
  background: #ffd048;
  transform: translateY(-2px);
  box-shadow: var(--shadow-gold);
}

@media (max-width: 980px) {
  .col-grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }
}
@media (max-width: 720px) {
  .col-hero { padding: 110px 0 48px; }
  .col-grid { grid-template-columns: 1fr; gap: 20px; padding: 0 16px; }
  .col-list-section { padding: 40px 0 64px; }
  .art-hero { padding: 105px 0 32px; }
  .art-body { padding: 40px 16px 56px; }
  .art-cta { padding: 32px 22px; }
  .art-toc { padding: 20px 22px; }
}