/* =============================================
   DE Energy Consultants — Blog & Article styles
   Shared by blog/index.html and all article pages.
   Generated pages link this file; do not inline.
   ============================================= */

/* --- Blog index --- */
.blog-header {
  background: var(--bg-dark);
  padding: 120px 48px 64px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.blog-header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}
.blog-header .eyebrow {
  font-size: 0.75em;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}
.blog-header h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  color: rgba(255,255,255,0.95);
  margin-bottom: 16px;
  font-weight: 700;
}
.blog-header p {
  color: rgba(255,255,255,0.5);
  font-size: 1.1em;
  max-width: 560px;
}

.blog-grid-section {
  background: var(--bg-mid);
  padding: 80px 48px;
}
.blog-grid-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 32px;
}
.blog-card {
  background: var(--bg-dark);
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: 4px;
  padding: 36px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: border-color 0.2s;
}
.blog-card:hover {
  border-color: var(--accent);
}
.blog-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.75em;
  color: var(--text-muted);
}
.blog-card-tag {
  background: rgba(13,148,136,0.15);
  color: var(--accent-light);
  padding: 3px 10px;
  border-radius: 2px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 0.85em;
}
.blog-card h2 {
  font-size: 1.2em;
  color: rgba(255,255,255,0.92);
  font-weight: 600;
  line-height: 1.4;
  margin: 0;
}
.blog-card p {
  color: rgba(255,255,255,0.5);
  font-size: 0.92em;
  line-height: 1.7;
  margin: 0;
  flex: 1;
}
.blog-card-link {
  color: var(--accent-light);
  font-size: 0.85em;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.blog-card-link:hover { color: var(--text-primary); }

.blog-cta {
  background: var(--bg-dark);
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 80px 48px;
  text-align: center;
}
.blog-cta h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  color: rgba(255,255,255,0.92);
  margin-bottom: 16px;
}
.blog-cta p {
  color: rgba(255,255,255,0.5);
  margin-bottom: 32px;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

@media (max-width: 768px) {
  .blog-header { padding: 100px 24px 48px; }
  .blog-grid-section { padding: 60px 24px; }
  .blog-grid { grid-template-columns: 1fr; }
  .blog-cta { padding: 60px 24px; }
}

/* --- Article pages --- */
.article-header {
  background: var(--bg-dark);
  padding: 120px 48px 64px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.article-header-inner {
  max-width: 760px;
  margin: 0 auto;
}
.article-breadcrumb {
  font-size: 0.78em;
  color: rgba(255,255,255,0.55);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.article-breadcrumb a {
  color: rgba(255,255,255,0.55);
  text-decoration: none;
}
.article-breadcrumb a:hover { color: var(--accent-light); }
.article-breadcrumb span { opacity: 0.75; }

.article-tag {
  display: inline-block;
  background: rgba(13,148,136,0.15);
  color: var(--accent-light);
  padding: 4px 12px;
  border-radius: 2px;
  font-size: 0.75em;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 20px;
}
.article-header h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  color: rgba(255,255,255,0.95);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 20px;
}
.article-header .article-deck {
  font-size: 1.15em;
  color: rgba(255,255,255,0.55);
  line-height: 1.7;
  margin-bottom: 28px;
}
.article-meta {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.82em;
  color: rgba(255,255,255,0.55);
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.06);
}
.article-meta-dot { opacity: 0.6; }

/* Article Body */
.article-body {
  background: var(--bg-page);
  padding: 72px 48px;
}
.article-layout {
  max-width: 760px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 64px;
  align-items: start;
}
.article-content { min-width: 0; }
.article-content h2 {
  font-size: 1.4em;
  color: var(--text-primary);
  font-weight: 600;
  margin: 48px 0 16px;
  padding-top: 48px;
  border-top: 1px solid rgba(0,0,0,0.07);
}
.article-content h2:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}
.article-content h3 {
  font-size: 1.05em;
  color: var(--text-primary);
  font-weight: 600;
  margin: 28px 0 10px;
}
.article-content p {
  color: var(--text-muted);
  line-height: 1.85;
  margin-bottom: 20px;
  font-size: 0.97em;
}
.article-content ul, .article-content ol {
  color: var(--text-muted);
  line-height: 1.85;
  margin-bottom: 20px;
  padding-left: 24px;
  font-size: 0.97em;
}
.article-content li { margin-bottom: 8px; }
.article-content strong { color: var(--text-primary); font-weight: 600; }

.formula-box {
  background: var(--bg-dark);
  border: 1px solid rgba(13,148,136,0.3);
  border-left: 3px solid var(--accent);
  border-radius: 4px;
  padding: 24px 28px;
  margin: 28px 0;
}
.formula-box .formula-label {
  font-size: 0.72em;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-light);
  margin-bottom: 10px;
}
.formula-box .formula-text {
  font-family: 'Courier New', monospace;
  font-size: 0.95em;
  color: var(--text-on-dark);
  line-height: 1.6;
}

.callout-box {
  background: rgba(13,148,136,0.08);
  border: 1px solid rgba(13,148,136,0.2);
  border-radius: 4px;
  padding: 24px 28px;
  margin: 28px 0;
}
.callout-box p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.93em;
}
.callout-box strong { color: var(--accent-deep); }

.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.88em;
}
/* The article body sits on a light surface, so these cannot use the
   on-dark treatment the rest of the blog CSS assumes: dark-on-dark header
   text, and white borders and striping that vanish against the page. */
.data-table th {
  background: var(--bg-dark);
  color: var(--text-on-dark);
  font-weight: 600;
  padding: 12px 16px;
  text-align: left;
  border: 1px solid rgba(255,255,255,0.12);
}
.data-table td {
  color: var(--text-muted);
  padding: 11px 16px;
  border: 1px solid var(--border);
}
.data-table tr:nth-child(even) td { background: rgba(0,0,0,0.02); }

/* Sidebar */
.article-sidebar {
  position: sticky;
  top: 90px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.sidebar-card {
  background: var(--bg-dark);
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: 4px;
  padding: 28px;
}
.sidebar-card h3 {
  font-size: 0.85em;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-light);
  margin-bottom: 16px;
}
.sidebar-card p {
  font-size: 0.88em;
  color: var(--text-muted-dark);
  line-height: 1.65;
  margin-bottom: 16px;
}
.sidebar-card .btn { width: 100%; text-align: center; font-size: 0.8em; }

.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.toc-list a {
  font-size: 0.85em;
  color: var(--text-muted-dark);
  text-decoration: none;
  line-height: 1.4;
  display: block;
  padding-left: 12px;
  border-left: 2px solid rgba(255,255,255,0.08);
  transition: all 0.15s;
}
.toc-list a:hover {
  color: var(--accent-light);
  border-left-color: var(--accent);
}

/* Article footer CTA */
.article-end-cta {
  background: var(--bg-dark);
  border: 1px solid rgba(13,148,136,0.25);
  border-radius: 4px;
  padding: 40px;
  margin-top: 56px;
  text-align: center;
}
.article-end-cta h3 {
  font-size: 1.3em;
  color: var(--text-on-dark);
  margin-bottom: 12px;
}
.article-end-cta p {
  color: var(--text-muted-dark);
  font-size: 0.93em;
  margin-bottom: 24px;
}
.article-end-cta .btn-row {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Blog footer nav */
.blog-nav-footer {
  background: var(--bg-mid);
  padding: 48px;
  border-top: 1px solid rgba(255,255,255,0.06);
}
.blog-nav-footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.blog-nav-footer a {
  font-size: 0.85em;
  color: var(--text-muted);
  text-decoration: none;
}
.blog-nav-footer a:hover { color: var(--accent-light); }

@media (max-width: 900px) {
  .article-layout { grid-template-columns: 1fr; }
  .article-sidebar { position: static; }
}
@media (max-width: 768px) {
  .article-header { padding: 100px 24px 48px; }
  .article-body { padding: 48px 24px; }
  .blog-nav-footer { padding: 32px 24px; }
  .article-end-cta { padding: 28px 20px; }
  .article-end-cta .btn-row { flex-direction: column; }
}