/* ════════════════════════════════════════════════════════════════
   BLOG PAGES — .bl-* (quartet v6)
   Pixel-perfect port of the "Quartet Blog" design handoff (blog.css)
   with token substitutions for the codebase's quartet theme system.

   Token map applied:
     --bg-2 / --surface  → --surface-deep
     --surface-2         → --surface-deep-2
     --surface-hi        → --surface-deep-hi
     --line              → --line-deep
     --line-2            → --line-deep-2
     --ink               → --ink-deep
     --ink-2             → --ink-deep-2
     --muted             → --muted-deep
     --muted-2           → --muted-deep-2
     --faint             → --faint-deep
     --cyan              → --quartet-cyan
     --violet            → --quartet-violet
     --indigo            → --quartet-indigo
     --amber             → --quartet-amber
     --coral             → --quartet-coral
     --pos               → --quartet-pos
     --pos-fill          → --quartet-pos-fill
     --pos-border        → --quartet-pos-border
     --warn              → --quartet-amber
     --font-mono         → --font-quartet-mono

   Pages carry `class="feat-page bl-page"` — the .feat-page base class
   (from feature-quartet.css) provides the container, accent vars, and
   font. .bl-page only overrides padding-bottom.

   Tint helpers (.tint-cyan etc.) set --bl-tint / --bl-tint-fill /
   --bl-tint-border per-category so .bl-* components can consume them.

   @keyframes capital-pulse {
     0%   { box-shadow: 0 0 0 0 rgba(109, 212, 220, 0.55); }
     70%  { box-shadow: 0 0 0 7px rgba(109, 212, 220, 0); }
     100% { box-shadow: 0 0 0 0 rgba(109, 212, 220, 0); }
   }
   .feat-page / .feat-pill / .feat-cta* / .feat-link* classes live in
   feature-quartet.css — not duplicated here.
   ════════════════════════════════════════════════════════════════ */

.bl-page { padding-bottom: 0; }

.tint-cyan   { --bl-tint: var(--quartet-cyan);   --bl-tint-fill: rgba(109,212,220,0.10); --bl-tint-border: rgba(109,212,220,0.34); }
.tint-violet { --bl-tint: var(--quartet-violet); --bl-tint-fill: rgba(184,141,255,0.12); --bl-tint-border: rgba(184,141,255,0.36); }
.tint-indigo { --bl-tint: var(--quartet-indigo); --bl-tint-fill: rgba(138,159,255,0.12); --bl-tint-border: rgba(138,159,255,0.36); }
.tint-amber  { --bl-tint: var(--quartet-amber);  --bl-tint-fill: rgba(255,198,109,0.12); --bl-tint-border: rgba(255,198,109,0.36); }
.tint-coral  { --bl-tint: var(--quartet-coral);  --bl-tint-fill: rgba(255,155,122,0.12); --bl-tint-border: rgba(255,155,122,0.36); }
.tint-pos    { --bl-tint: var(--quartet-pos);    --bl-tint-fill: var(--quartet-pos-fill);        --bl-tint-border: var(--quartet-pos-border); }

.bl-tag {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--font-quartet-mono); font-size: 10px; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.14em;
  color: var(--bl-tint, var(--res-accent));
  padding: 4px 9px; border-radius: 3px;
  background: var(--bl-tint-fill, var(--res-accent-fill));
  border: 1px solid var(--bl-tint-border, var(--res-accent-border));
  white-space: nowrap;
}
.bl-tag::before { content: ''; width: 5px; height: 5px; border-radius: 999px; background: var(--bl-tint, var(--res-accent)); }

.bl-hero {
  text-align: center; max-width: 760px; margin: 0 auto 56px;
  padding: 30px 0 46px; border-bottom: 1px solid var(--line-deep-2);
}
.bl-hero .feat-pill { margin: 0 0 22px; }
.bl-hero-title {
  font-size: 56px; font-weight: 600; letter-spacing: -0.04em; line-height: 1.0;
  color: var(--ink-deep); margin: 0 0 20px; text-wrap: balance;
}
.bl-hero-title .accent { color: var(--res-accent); }
.bl-hero-sub { font-size: 17px; color: var(--muted-deep); line-height: 1.6; margin: 0 auto; max-width: 56ch; text-wrap: pretty; }

.bl-sec { margin-bottom: 72px; }
.bl-sec-head {
  display: flex; align-items: baseline; justify-content: space-between; gap: 20px;
  padding-bottom: 16px; margin-bottom: 26px; border-bottom: 1px solid var(--line-deep-2);
}
.bl-sec-head h2 {
  margin: 0; font-size: 12px; font-weight: 700; letter-spacing: 0.20em;
  text-transform: uppercase; color: var(--res-accent);
}
.bl-sec-head .meta { font-family: var(--font-quartet-mono); font-size: 11px; color: var(--muted-deep-2); letter-spacing: 0.02em; }

.bl-featured { display: grid; grid-template-columns: 1.5fr 1fr; gap: 18px; align-items: stretch; }
.bl-lead {
  position: relative; display: flex; flex-direction: column;
  text-decoration: none; color: inherit; overflow: hidden;
  background: var(--surface-deep); border: 1px solid var(--line-deep-2); border-radius: 12px;
  padding: 30px 32px 28px; transition: border-color .2s, transform .2s, background .2s;
}
.bl-lead::before {
  content: ''; position: absolute; inset: 0; pointer-events: none; opacity: 0; transition: opacity .25s;
  background: radial-gradient(110% 130% at 12% 0%, var(--bl-tint-fill, var(--res-accent-fill)), transparent 58%);
}
.bl-lead:hover { border-color: var(--bl-tint-border, var(--res-accent-border)); transform: translateY(-3px); }
.bl-lead:hover::before { opacity: 1; }
.bl-lead > * { position: relative; }
.bl-lead-eyebrow { font-family: var(--font-quartet-mono); font-size: 10px; text-transform: uppercase; letter-spacing: 0.18em; color: var(--muted-deep-2); margin-bottom: 18px; }
.bl-lead-title { font-size: 31px; font-weight: 600; letter-spacing: -0.026em; line-height: 1.1; color: var(--ink-deep); margin: 16px 0 14px; text-wrap: balance; }
.bl-lead:hover .bl-lead-title { color: var(--bl-tint, var(--res-accent)); }
.bl-lead-excerpt { font-size: 14.5px; color: var(--muted-deep); line-height: 1.62; margin: 0; max-width: 52ch; text-wrap: pretty; }
.bl-lead-foot { margin-top: auto; padding-top: 24px; display: flex; align-items: center; gap: 12px; font-family: var(--font-quartet-mono); font-size: 11px; color: var(--muted-deep-2); }
.bl-lead-foot .sep { color: var(--faint-deep); }

.bl-feat-side { display: flex; flex-direction: column; gap: 18px; }
.bl-mini {
  flex: 1; display: flex; flex-direction: column; justify-content: center;
  text-decoration: none; color: inherit;
  background: var(--surface-deep); border: 1px solid var(--line-deep-2); border-radius: 12px;
  padding: 22px 24px; transition: border-color .2s, transform .2s;
}
.bl-mini:hover { border-color: var(--bl-tint-border, var(--res-accent-border)); transform: translateY(-3px); }
.bl-mini-title { font-size: 17px; font-weight: 600; letter-spacing: -0.015em; line-height: 1.24; color: var(--ink-deep); margin: 13px 0 0; text-wrap: balance; }
.bl-mini:hover .bl-mini-title { color: var(--bl-tint, var(--res-accent)); }
.bl-mini-foot { margin-top: 14px; font-family: var(--font-quartet-mono); font-size: 10.5px; color: var(--muted-deep-2); }

.bl-filter { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-bottom: 30px; }
.bl-pill {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 8px 15px; border-radius: 999px; cursor: pointer;
  background: transparent; border: 1px solid var(--line-deep-2);
  color: var(--ink-deep-2); font-family: inherit; font-size: 12.5px; font-weight: 500;
  transition: border-color .15s, color .15s, background .15s;
}
.bl-pill:hover { border-color: var(--muted-deep-2); color: var(--ink-deep); }
.bl-pill .n { font-family: var(--font-quartet-mono); font-size: 10.5px; color: var(--muted-deep-2); font-variant-numeric: tabular-nums; }
.bl-pill.active { background: var(--res-accent-fill); border-color: var(--res-accent-border); color: var(--res-accent); }
.bl-pill.active .n { color: var(--res-accent); }

.bl-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.bl-card {
  display: flex; flex-direction: column;
  text-decoration: none; color: inherit;
  background: var(--surface-deep); border: 1px solid var(--line-deep-2); border-radius: 10px;
  padding: 24px 24px 22px; transition: border-color .2s, transform .2s;
}
.bl-card:hover { border-color: var(--bl-tint-border, var(--res-accent-border)); transform: translateY(-4px); }
.bl-card-head { display: flex; align-items: center; gap: 10px; margin-bottom: 18px; }
.bl-card-read { margin-left: auto; font-family: var(--font-quartet-mono); font-size: 10px; color: var(--muted-deep-2); text-transform: uppercase; letter-spacing: 0.08em; }
.bl-card-title { font-size: 18px; font-weight: 600; letter-spacing: -0.018em; line-height: 1.26; color: var(--ink-deep); margin: 0 0 12px; text-wrap: balance; }
.bl-card:hover .bl-card-title { color: var(--bl-tint, var(--res-accent)); }
.bl-card-excerpt { font-size: 13.5px; color: var(--muted-deep); line-height: 1.6; margin: 0 0 20px; text-wrap: pretty; }
.bl-card-foot { margin-top: auto; padding-top: 16px; border-top: 1px solid var(--line-deep); display: flex; align-items: center; gap: 10px; font-family: var(--font-quartet-mono); font-size: 10.5px; color: var(--muted-deep-2); }
.bl-card-foot .sep { color: var(--faint-deep); }

.bl-more { display: flex; justify-content: center; margin-top: 34px; }
.bl-empty { text-align: center; color: var(--muted-deep); font-size: 14px; padding: 40px 0; grid-column: 1 / -1; }

.bl-area-hero {
  text-align: center; max-width: 720px; margin: 0 auto 60px;
  padding: 30px 0 48px; border-bottom: 1px solid var(--line-deep-2);
}
.bl-area-hero .feat-pill { margin: 0 0 22px; }
.bl-area-title { font-size: 50px; font-weight: 600; letter-spacing: -0.038em; line-height: 1.02; color: var(--ink-deep); margin: 0 0 18px; text-wrap: balance; }
.bl-area-title .accent { color: var(--res-accent); }
.bl-area-sub { font-size: 17px; color: var(--muted-deep); line-height: 1.6; margin: 0 auto 30px; max-width: 54ch; text-wrap: pretty; }
.bl-area-stats { display: flex; justify-content: center; gap: 26px; margin-top: 26px; font-family: var(--font-quartet-mono); font-size: 11px; color: var(--muted-deep-2); }
.bl-area-stats b { color: var(--ink-deep-2); font-weight: 500; }

.bl-progress { position: fixed; top: 0; left: 0; height: 3px; width: 0; background: var(--res-accent); z-index: 80; transition: width .08s linear; }

.bl-crumb { display: flex; align-items: center; gap: 9px; font-family: var(--font-quartet-mono); font-size: 11px; color: var(--muted-deep-2); margin-bottom: 26px; flex-wrap: wrap; }
.bl-crumb a { color: var(--muted-deep); text-decoration: none; transition: color .15s; }
.bl-crumb a:hover { color: var(--res-accent); }
.bl-crumb .sep { color: var(--faint-deep); }
.bl-crumb .cur { color: var(--ink-deep-2); }

.bl-article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 220px; gap: 64px; align-items: start; max-width: 1000px; margin: 0 auto; }
.bl-article-main { min-width: 0; }

.bl-art-head { padding-bottom: 30px; margin-bottom: 36px; border-bottom: 1px solid var(--line-deep-2); }
.bl-art-title { font-size: 42px; font-weight: 600; letter-spacing: -0.032em; line-height: 1.08; color: var(--ink-deep); margin: 18px 0 0; text-wrap: balance; }
.bl-art-deck { font-size: 18px; color: var(--muted-deep); line-height: 1.6; margin: 18px 0 0; max-width: 60ch; text-wrap: pretty; }
.bl-art-meta { display: flex; align-items: center; gap: 12px; margin-top: 26px; font-family: var(--font-quartet-mono); font-size: 11.5px; color: var(--muted-deep-2); flex-wrap: wrap; }
.bl-art-avatar {
  width: 26px; height: 26px; border-radius: 999px; flex-shrink: 0;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--res-accent-fill); border: 1px solid var(--res-accent-border);
  color: var(--res-accent); font-size: 10px; font-weight: 700; letter-spacing: 0;
}
.bl-art-meta .author { color: var(--ink-deep-2); }
.bl-art-meta .sep { color: var(--faint-deep); }
.bl-art-meta svg { width: 13px; height: 13px; }
.bl-art-meta > span { white-space: nowrap; }
.bl-art-tags { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 22px; }
.bl-chip { font-family: var(--font-quartet-mono); font-size: 10.5px; color: var(--muted-deep-2); letter-spacing: -0.01em; padding: 4px 10px; border: 1px solid var(--line-deep-2); border-radius: 999px; }
.bl-chip::before { content: '#'; color: var(--faint-deep); margin-right: 2px; }

.bl-toolfig { margin: 0 0 42px; }
.bl-tool { background: var(--surface-deep); border: 1px solid var(--line-deep-2); border-radius: 10px; overflow: hidden; }
.bl-tool-head { display: flex; align-items: center; justify-content: space-between; gap: 14px; padding: 14px 18px; border-bottom: 1px solid var(--line-deep); }
.bl-tool-head .ttl { display: inline-flex; align-items: center; gap: 9px; font-size: 13px; font-weight: 600; color: var(--ink-deep); letter-spacing: -0.01em; }
.bl-tool-head .ttl .ico { width: 26px; height: 26px; border-radius: 7px; display: inline-flex; align-items: center; justify-content: center; background: var(--res-accent-fill); border: 1px solid var(--res-accent-border); color: var(--res-accent); }
.bl-tool-head .ttl .ico svg { width: 15px; height: 15px; }
.bl-tool-live { display: inline-flex; align-items: center; gap: 7px; font-size: 9px; color: var(--muted-deep); text-transform: uppercase; letter-spacing: 0.16em; font-weight: 600; }
.bl-tool-live .pulse { width: 6px; height: 6px; border-radius: 999px; background: var(--res-accent); animation: capital-pulse 2.4s ease-out infinite; }
.bl-tool-body { display: grid; grid-template-columns: 1fr 1.1fr; gap: 0; }
.bl-tool-result { padding: 22px 22px; border-right: 1px solid var(--line-deep); display: flex; flex-direction: column; justify-content: center; }
.bl-tool-result .lbl { font-size: 9.5px; color: var(--muted-deep); text-transform: uppercase; letter-spacing: 0.16em; font-weight: 600; margin-bottom: 12px; }
.bl-tool-result .val { font-family: var(--font-quartet-mono); font-size: 40px; font-weight: 500; color: var(--res-accent); letter-spacing: -0.04em; line-height: 0.95; font-variant-numeric: tabular-nums; }
.bl-tool-result .sub { font-family: var(--font-quartet-mono); font-size: 11px; color: var(--muted-deep-2); margin-top: 12px; }
.bl-tool-chart { padding: 18px 22px; display: flex; flex-direction: column; }
.bl-tool-bars { display: flex; align-items: flex-end; gap: 5px; height: 80px; flex: 1; }
.bl-tool-bars .b { flex: 1; background: var(--res-accent); opacity: 0.26; border-radius: 2px 2px 0 0; transition: opacity .2s; }
.bl-tool-bars .b.on { opacity: 0.85; }
.bl-tool-x { display: flex; justify-content: space-between; margin-top: 8px; font-family: var(--font-quartet-mono); font-size: 9.5px; color: var(--muted-deep-2); }
.bl-tool-foot { display: flex; align-items: center; justify-content: space-between; gap: 14px; padding: 13px 18px; border-top: 1px solid var(--line-deep-2); background: var(--surface-deep); }
.bl-tool-foot .note { font-size: 11px; color: var(--muted-deep); }
.bl-tool-open { display: inline-flex; align-items: center; gap: 7px; font-size: 10.5px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.14em; color: var(--res-accent); text-decoration: none; }
.bl-tool-open svg { width: 13px; height: 13px; transition: transform .2s; }
.bl-tool-open:hover svg { transform: translateX(3px); }
.bl-tool-cap { text-align: center; font-family: var(--font-quartet-mono); font-size: 11px; color: var(--muted-deep-2); margin-top: 13px; letter-spacing: 0.01em; }

.bl-prose { font-size: 16.5px; line-height: 1.75; color: var(--ink-deep-2); }
.bl-prose > *:first-child { margin-top: 0; }
.bl-prose p { margin: 0 0 22px; max-width: 68ch; text-wrap: pretty; }
.bl-prose h2 {
  font-size: 27px; font-weight: 600; letter-spacing: -0.024em; line-height: 1.16;
  color: var(--ink-deep); margin: 52px 0 18px; scroll-margin-top: 28px; text-wrap: balance;
}
.bl-prose h3 { font-size: 18.5px; font-weight: 600; letter-spacing: -0.015em; color: var(--ink-deep); margin: 36px 0 12px; }
.bl-prose strong { color: var(--ink-deep); font-weight: 600; }
.bl-prose em { font-style: italic; color: var(--ink-deep-2); }
.bl-prose a {
  color: var(--res-accent); text-decoration: underline; text-underline-offset: 2px;
  text-decoration-thickness: 1px; text-decoration-color: var(--res-accent-border);
  transition: text-decoration-color .15s;
}
.bl-prose a:hover { text-decoration-color: var(--res-accent); }
.bl-prose code {
  font-family: var(--font-quartet-mono); font-size: 0.86em; color: var(--res-accent);
  background: var(--res-accent-fill); border: 1px solid var(--res-accent-border);
  padding: 1px 6px; border-radius: 4px; letter-spacing: -0.01em;
}
.bl-prose ul, .bl-prose ol { margin: 0 0 22px; padding-left: 4px; max-width: 66ch; }
.bl-prose ul { list-style: none; }
.bl-prose ul li { position: relative; padding-left: 26px; margin-bottom: 12px; }
.bl-prose ul li::before { content: ''; position: absolute; left: 6px; top: 11px; width: 6px; height: 6px; border-radius: 999px; background: var(--res-accent); }
.bl-prose ol { list-style: none; counter-reset: bl-ol; padding-left: 0; }
.bl-prose ol li { position: relative; padding-left: 44px; margin-bottom: 16px; counter-increment: bl-ol; }
.bl-prose ol li::before {
  content: counter(bl-ol); position: absolute; left: 0; top: -1px;
  width: 28px; height: 28px; box-sizing: border-box;
  display: inline-block; text-align: center; line-height: 26px;
  border-radius: 999px;
  background: var(--res-accent-fill); border: 1px solid var(--res-accent-border);
  color: var(--res-accent); font-family: var(--font-quartet-mono); font-size: 12.5px; font-weight: 600;
  font-variant-numeric: tabular-nums;
}
.bl-prose ol.bl-ol { list-style: none; counter-reset: none; padding-left: 0; }
.bl-prose ol.bl-ol li { display: grid; grid-template-columns: 28px 1fr; gap: 16px; align-items: start; position: static; padding-left: 0; margin-bottom: 16px; }
.bl-prose ol.bl-ol li::before { content: none; }
.bl-ol-n {
  width: 28px; height: 28px; box-sizing: border-box; margin-top: 1px;
  display: inline-flex; align-items: center; justify-content: center; border-radius: 999px;
  background: var(--res-accent-fill); border: 1px solid var(--res-accent-border);
  color: var(--res-accent); font-family: var(--font-quartet-mono); font-size: 12.5px; font-weight: 600;
  font-variant-numeric: tabular-nums;
}
.bl-ol-t { min-width: 0; }
.bl-prose li { color: var(--ink-deep-2); line-height: 1.65; }
.bl-prose hr { border: 0; border-top: 1px solid var(--line-deep-2); margin: 44px 0; }

.bl-callout {
  margin: 30px 0; padding: 20px 24px;
  border-left: 2px solid var(--res-accent); border-radius: 0 8px 8px 0;
  background: var(--res-accent-fill);
}
.bl-callout p { font-size: 14.5px; color: var(--ink-deep-2); line-height: 1.66; margin: 0; max-width: none; }
.bl-callout p + p { margin-top: 12px; }
.bl-callout .kicker { display: block; font-family: var(--font-quartet-mono); font-size: 9.5px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.16em; color: var(--res-accent); margin-bottom: 8px; }
.bl-callout.affiliate { border-left: 2px dashed var(--muted-deep-2); background: var(--surface-deep); }
.bl-callout.affiliate p { color: var(--muted-deep); font-style: italic; }
.bl-callout.affiliate .kicker { color: var(--muted-deep-2); }
.bl-callout.warn { border-left-color: var(--quartet-amber); background: rgba(255,198,109,0.08); }
.bl-callout.warn .kicker { color: var(--quartet-amber); }

.bl-bar {
  display: grid; grid-template-columns: auto 1fr; gap: 14px; align-items: start;
  margin: 26px 0; padding: 16px 20px;
  background: var(--surface-deep); border: 1px solid var(--quartet-pos-border); border-radius: 8px;
}
.bl-bar .ic { width: 26px; height: 26px; border-radius: 7px; display: inline-flex; align-items: center; justify-content: center; background: var(--quartet-pos-fill); color: var(--quartet-pos); flex-shrink: 0; }
.bl-bar .ic svg { width: 15px; height: 15px; }
.bl-bar .txt { font-size: 14px; color: var(--ink-deep-2); line-height: 1.6; }
.bl-bar .txt b { color: var(--quartet-pos); font-weight: 600; }

.bl-share { display: flex; align-items: center; gap: 14px; margin: 44px 0; padding: 18px 0; border-top: 1px solid var(--line-deep-2); border-bottom: 1px solid var(--line-deep-2); }
.bl-share .lbl { font-family: var(--font-quartet-mono); font-size: 10px; text-transform: uppercase; letter-spacing: 0.16em; color: var(--muted-deep-2); }
.bl-share-row { display: flex; gap: 8px; margin-left: auto; }
.bl-share-btn {
  width: 36px; height: 36px; border-radius: 8px; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  background: transparent; border: 1px solid var(--line-deep-2); color: var(--muted-deep);
  transition: color .15s, border-color .15s, background .15s;
}
.bl-share-btn:hover { color: var(--res-accent); border-color: var(--res-accent-border); background: var(--res-accent-fill); }
.bl-share-btn svg { width: 16px; height: 16px; }

.bl-cta {
  position: relative; overflow: hidden;
  display: grid; grid-template-columns: 1fr auto; gap: 28px; align-items: center;
  margin: 40px 0; padding: 28px 32px;
  background: var(--surface-deep); border: 1px solid var(--res-accent-border); border-radius: 12px;
}
.bl-cta::before { content: ''; position: absolute; inset: 0; pointer-events: none; background: radial-gradient(120% 140% at 0% 0%, var(--res-accent-fill), transparent 55%); }
.bl-cta > * { position: relative; }
.bl-cta-title { font-size: 19px; font-weight: 600; letter-spacing: -0.02em; color: var(--ink-deep); margin: 0 0 8px; }
.bl-cta-sub { font-size: 13.5px; color: var(--muted-deep); line-height: 1.55; margin: 0 0 16px; max-width: 52ch; }
.bl-cta-checks { display: flex; flex-wrap: wrap; gap: 8px 22px; }
.bl-cta-checks span { display: inline-flex; align-items: center; gap: 8px; font-size: 12px; color: var(--ink-deep-2); }
.bl-cta-checks svg { width: 14px; height: 14px; color: var(--quartet-pos); flex-shrink: 0; }
.bl-cta-action { display: flex; flex-direction: column; align-items: flex-end; gap: 10px; text-align: right; }
.bl-cta-action .fine { font-size: 10.5px; color: var(--muted-deep-2); }

.bl-relcalc { margin: 48px 0 8px; }
.bl-relcalc-head { font-family: var(--font-quartet-mono); font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.18em; color: var(--res-accent); margin-bottom: 18px; }

.bl-toc { position: sticky; top: 88px; align-self: start; }
.bl-toc-label { font-family: var(--font-quartet-mono); font-size: 10px; text-transform: uppercase; letter-spacing: 0.18em; color: var(--muted-deep-2); margin-bottom: 14px; }
.bl-toc-list { display: flex; flex-direction: column; border-left: 1px solid var(--line-deep-2); }
.bl-toc-link {
  font-size: 12.5px; color: var(--muted-deep); text-decoration: none; line-height: 1.4;
  padding: 7px 0 7px 14px; margin-left: -1px; border-left: 1px solid transparent;
  transition: color .15s, border-color .15s;
}
.bl-toc-link:hover { color: var(--ink-deep-2); }
.bl-toc-link.active { color: var(--res-accent); border-left-color: var(--res-accent); }
.bl-toc-meta { margin-top: 22px; padding-top: 18px; border-top: 1px solid var(--line-deep); font-family: var(--font-quartet-mono); font-size: 10.5px; color: var(--muted-deep-2); line-height: 1.7; }
.bl-toc-meta b { color: var(--ink-deep-2); font-weight: 500; }

.bl-related { border-top: 1px solid var(--line-deep-2); margin: 64px -32px 0; padding: 54px 32px 8px; background: var(--surface-deep); }
.bl-related-inner { max-width: 1000px; margin: 0 auto; }
.bl-related-head { font-size: 12px; font-weight: 700; letter-spacing: 0.20em; text-transform: uppercase; color: var(--res-accent); margin-bottom: 24px; text-align: center; }

@media (max-width: 980px) {
  .bl-article-layout { grid-template-columns: 1fr; gap: 0; max-width: 720px; }
  .bl-toc { display: none; }
  .bl-related { margin-left: -16px; margin-right: -16px; }
}
@media (max-width: 900px) {
  .bl-featured { grid-template-columns: 1fr; }
  .bl-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .bl-tool-body { grid-template-columns: 1fr; }
  .bl-tool-result { border-right: 0; border-bottom: 1px solid var(--line-deep); }
}
@media (max-width: 640px) {
  .bl-hero-title { font-size: 38px; }
  .bl-area-title { font-size: 36px; }
  .bl-art-title { font-size: 31px; }
  .bl-grid { grid-template-columns: 1fr; }
  .bl-lead-title { font-size: 25px; }
  .bl-cta { grid-template-columns: 1fr; }
  .bl-cta-action { align-items: flex-start; text-align: left; }
  .bl-related { margin-left: -16px; margin-right: -16px; padding: 44px 16px 8px; }
}

/* ─── Partner card (quartet-native affiliate embed) ────────────── */
.bl-partner {
  background: var(--surface-deep); border: 1px solid var(--line-deep-2); border-radius: 10px;
  padding: 24px 22px; margin: 38px 0;
}
.bl-partner-head { display: flex; align-items: center; gap: 14px; margin-bottom: 14px; }
.bl-partner-logo { height: 28px; width: auto; object-fit: contain; flex-shrink: 0; }
.bl-partner-logo.logo-dark { display: none; }
html.dark .bl-partner-logo.logo-light { display: none; }
html.dark .bl-partner-logo.logo-dark { display: block; }
.bl-partner-name { font-size: 15px; font-weight: 600; letter-spacing: -0.015em; color: var(--ink-deep); }
.bl-partner-perk {
  display: inline-flex; align-items: center; gap: 5px; margin-top: 4px;
  font-family: var(--font-quartet-mono); font-size: 10px; font-weight: 600;
  letter-spacing: 0.06em; color: var(--res-accent);
}
.bl-partner-perk svg { width: 12px; height: 12px; }
.bl-partner-body { font-size: 14px; color: var(--ink-deep-2); line-height: 1.6; margin: 0 0 16px; }
.bl-partner-code {
  display: flex; align-items: center; gap: 8px; margin-bottom: 16px;
  font-family: var(--font-quartet-mono); font-size: 10px; text-transform: uppercase;
  letter-spacing: 0.12em; color: var(--muted-deep-2);
}
.bl-partner-code code {
  display: inline-block; padding: 4px 10px; font-family: var(--font-quartet-mono);
  font-size: 13px; font-weight: 700; background: var(--res-accent-fill);
  color: var(--res-accent); border-radius: 5px; letter-spacing: 0.04em;
}
.bl-partner-cta {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--res-accent); color: var(--bg-deep); border: none; border-radius: 8px;
  font-family: var(--font-quartet); font-size: 13px; font-weight: 600;
  padding: 11px 22px; text-decoration: none; cursor: pointer;
  transition: background .2s, transform .2s;
}
.bl-prose .bl-partner-cta { color: var(--bg-deep); text-decoration: none; }
.bl-partner-cta:hover, .bl-prose .bl-partner-cta:hover {
  background: var(--res-accent-2, var(--res-accent)); transform: translateY(-1px);
  color: var(--bg-deep); text-decoration: none;
}
.bl-partner-cta svg { width: 13px; height: 13px; transition: transform .2s; }
.bl-partner-cta:hover svg { transform: translateX(3px); }
.bl-partner-disc {
  display: block; margin-top: 12px; font-family: var(--font-quartet-mono);
  font-size: 10px; text-transform: uppercase; letter-spacing: 0.12em; color: var(--muted-deep-2);
}

.bl-blog-disclosure { font-size: 12px; color: var(--muted-deep-2); line-height: 1.55; text-align: center; max-width: 60ch; margin: 0 auto; padding: 40px 0 48px; }