/* Artra — Modern blog post page.
   Extends the .apl design system (auto_pilot_landing.css) with article-specific
   components: hero, breadcrumbs, TOC sidebar, prose typography, comparison
   tables, FAQ accordion, share buttons, related posts, scroll progress.
   CSP-clean: zero inline styles, no inline scripts.
   Honors feedback_no_purple_gradient — uses solid monochrome + cyan accent
   sparingly; skips the auto_pilot rainbow gradient. */

:root {
  --bp-bg: #0a0a0a;
  --bp-bg-1: #111111;
  --bp-bg-2: #161616;
  --bp-line: rgba(255,255,255,0.08);
  --bp-line-2: rgba(255,255,255,0.14);
  --bp-fg: #ffffff;
  --bp-fg-2: rgba(255,255,255,0.78);
  --bp-fg-3: rgba(255,255,255,0.55);
  --bp-fg-4: rgba(255,255,255,0.32);
  --bp-accent: #5cc8ff;
  --bp-accent-soft: rgba(92,200,255,0.14);
  --bp-ok: #84e1a4;
  --bp-warn: #ff7a59;
  --bp-pad: 32px;
  --bp-maxw: 1240px;
  --bp-prose: 720px;
  --bp-radius: 14px;
  --bp-radius-lg: 22px;
  --bp-scroll-progress: 0%;
}

/* ───────── reset / base ───────── */
html.bp { background: var(--bp-bg); scroll-behavior: smooth; }
.bp-body {
  margin: 0; padding: 0;
  font-family: "Geist", -apple-system, BlinkMacSystemFont, "SF Pro Text", system-ui, sans-serif;
  background: var(--bp-bg);
  color: var(--bp-fg);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  letter-spacing: -0.005em;
  overflow-x: hidden;
}
.bp-body * { box-sizing: border-box; }
/* Prose images only — exclude nav/footer chrome logos from the fluid img reset */
.bp-body img:not(.bp-nav-logo-img), .bp-body video { max-width: 100%; height: auto; display: block; }
.bp-body .mono { font-family: "Geist Mono", ui-monospace, "SF Mono", Menlo, monospace; }

.bp-wrap { max-width: var(--bp-maxw); margin: 0 auto; padding: 0 var(--bp-pad); }
.bp-body a { color: var(--bp-accent); text-decoration: none; }
.bp-body a:hover { text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }

.bp-eyebrow {
  font-family: "Geist Mono", ui-monospace, monospace;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--bp-fg-3);
  display: inline-flex; align-items: center; gap: 8px;
}
.bp-eyebrow .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--bp-accent); box-shadow: 0 0 12px var(--bp-accent); }

/* skip-link for a11y / SEO */
.bp-skip {
  position: absolute; left: -9999px; top: auto; overflow: hidden;
}
.bp-skip:focus {
  left: 16px; top: 16px;
  background: var(--bp-fg); color: var(--bp-bg);
  padding: 10px 14px; border-radius: 999px;
  z-index: 9999;
}

/* ───────── scroll progress ───────── */
.bp-progress {
  position: fixed; top: 0; left: 0; right: 0;
  height: 2px;
  background: transparent;
  z-index: 60;
  pointer-events: none;
}
.bp-progress::after {
  content: "";
  display: block;
  height: 100%;
  width: var(--bp-scroll-progress);
  background: var(--bp-accent);
  box-shadow: 0 0 16px var(--bp-accent);
  transition: width 0.05s linear;
}

/* ───────── nav (matches .apl pattern) ───────── */
.bp-nav {
  position: fixed; top: 16px; left: 0; right: 0; z-index: 50;
  display: flex; justify-content: center; pointer-events: none;
}
.bp-nav-inner {
  pointer-events: auto;
  display: flex; align-items: center; gap: 22px;
  padding: 10px 12px 10px 18px;
  background: rgba(15,15,15,0.72);
  backdrop-filter: blur(14px) saturate(160%);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
  border: 1px solid var(--bp-line);
  border-radius: 999px;
  box-shadow: 0 12px 40px rgba(0,0,0,0.6), inset 0 1px 0 rgba(255,255,255,0.04);
}
.bp-nav-logo { display: flex; align-items: center; gap: 8px; font-weight: 500; color: var(--bp-fg); }
.bp-nav-logo:hover { text-decoration: none; }
.bp-nav-logo .bp-nav-logo-img {
  height: 20px;
  width: auto;
  max-width: none;
  display: block;
}
.bp-nav-links { display: flex; gap: 22px; font-size: 14px; color: var(--bp-fg-2); }
.bp-nav-links a { color: var(--bp-fg-2); }
.bp-nav-links a:hover { color: var(--bp-fg); text-decoration: none; }
.bp-nav-ghost { font-size: 13px; padding: 9px 14px; border-radius: 999px; color: var(--bp-fg-2); }
.bp-nav-ghost:hover { color: var(--bp-fg); text-decoration: none; }
.bp-nav-cta {
  font-size: 13px; padding: 9px 16px; border-radius: 999px;
  background: var(--bp-fg); color: var(--bp-bg); font-weight: 500;
  transition: transform .2s ease, box-shadow .2s ease;
}
.bp-nav-cta:hover { transform: translateY(-1px); text-decoration: none; box-shadow: 0 10px 24px rgba(255,255,255,0.08); }

@media (max-width: 640px) {
  .bp-nav-links { display: none; }
}

/* ───────── buttons ───────── */
.bp-btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 22px; border-radius: 999px;
  font-size: 15px; font-weight: 500;
  background: var(--bp-fg); color: var(--bp-bg);
  border: 1px solid transparent;
  transition: transform .2s ease, box-shadow .2s ease;
}
.bp-btn:hover { transform: translateY(-1px); box-shadow: 0 12px 30px rgba(255,255,255,0.08); text-decoration: none; }
.bp-btn .arrow { transition: transform .2s ease; }
.bp-btn:hover .arrow { transform: translateX(3px); }
.bp-btn-ghost {
  background: rgba(255,255,255,0.04);
  color: var(--bp-fg);
  border: 1px solid var(--bp-line-2);
}

/* ───────── article header (hero) ───────── */
.bp-hero {
  padding: 140px var(--bp-pad) 56px;
  position: relative;
  overflow: hidden;
}
.bp-hero-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--bp-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--bp-line) 1px, transparent 1px);
  background-size: 56px 56px;
  background-position: -1px -1px;
  mask-image: radial-gradient(70vw 70vh at 50% 30%, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(70vw 70vh at 50% 30%, black 30%, transparent 75%);
  opacity: 0.35;
  pointer-events: none;
}
.bp-hero-inner {
  position: relative; z-index: 2;
  max-width: var(--bp-maxw); margin: 0 auto;
}
.bp-breadcrumb {
  font-family: "Geist Mono", ui-monospace, monospace;
  font-size: 12px;
  color: var(--bp-fg-3);
  margin-bottom: 24px;
  display: flex; gap: 8px; flex-wrap: wrap;
}
.bp-breadcrumb a { color: var(--bp-fg-3); }
.bp-breadcrumb a:hover { color: var(--bp-fg); text-decoration: none; }
.bp-breadcrumb .sep { color: var(--bp-fg-4); }
.bp-breadcrumb .current { color: var(--bp-fg-2); }

.bp-hero h1 {
  font-size: clamp(36px, 5vw, 60px);
  line-height: 1.05;
  letter-spacing: -0.035em;
  font-weight: 480;
  margin: 0 0 20px;
  max-width: 22ch;
}
.bp-hero-sub {
  font-size: clamp(17px, 1.4vw, 21px);
  color: var(--bp-fg-2);
  line-height: 1.55;
  max-width: 60ch;
  margin: 0 0 32px;
}
.bp-hero-meta {
  display: flex; flex-wrap: wrap; gap: 16px 28px;
  color: var(--bp-fg-3);
  font-size: 13px;
}
.bp-hero-meta .item { display: inline-flex; align-items: center; gap: 8px; }
.bp-hero-meta .item .icon {
  width: 14px; height: 14px;
  display: inline-block;
  border: 1px solid var(--bp-line-2);
  border-radius: 50%;
  background: rgba(255,255,255,0.04);
}
.bp-hero-meta .author { color: var(--bp-fg-2); }

/* ───────── layout: article + sidebar ───────── */
.bp-layout {
  position: relative;
  max-width: var(--bp-maxw);
  margin: 0 auto;
  padding: 32px var(--bp-pad) 80px;
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr) 240px;
  gap: 48px;
}
@media (max-width: 1100px) {
  .bp-layout { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .bp-toc-aside, .bp-share-aside { display: none; }
}

/* ───────── TOC sidebar ───────── */
.bp-toc-aside {
  position: relative;
}
.bp-toc {
  position: sticky; top: 100px;
  font-size: 13px;
}
.bp-toc-title {
  font-family: "Geist Mono", ui-monospace, monospace;
  font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--bp-fg-3);
  margin: 0 0 14px;
}
.bp-toc-list { list-style: none; padding: 0; margin: 0; }
.bp-toc-list li { margin: 0; padding: 0; }
.bp-toc-list a {
  display: block;
  padding: 6px 12px;
  color: var(--bp-fg-3);
  border-left: 1px solid var(--bp-line);
  line-height: 1.4;
  transition: color .15s ease, border-color .15s ease;
}
.bp-toc-list a:hover { color: var(--bp-fg); text-decoration: none; }
.bp-toc-list a.h3 { padding-left: 24px; font-size: 12px; }
.bp-toc-list a.active {
  color: var(--bp-fg);
  border-left-color: var(--bp-accent);
}

/* ───────── share sidebar ───────── */
.bp-share-aside { position: relative; }
.bp-share {
  position: sticky; top: 100px;
  display: flex; flex-direction: column; gap: 8px;
  align-items: flex-start;
}
.bp-share-label {
  font-family: "Geist Mono", ui-monospace, monospace;
  font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--bp-fg-3);
  margin-bottom: 6px;
}
.bp-share a, .bp-share button {
  width: 36px; height: 36px;
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--bp-line-2);
  border-radius: 50%;
  background: rgba(255,255,255,0.03);
  color: var(--bp-fg-2);
  font-family: inherit; cursor: pointer;
  transition: color .15s ease, border-color .15s ease, transform .15s ease;
}
.bp-share a:hover, .bp-share button:hover {
  color: var(--bp-fg); border-color: var(--bp-fg-2);
  transform: translateY(-1px); text-decoration: none;
}
.bp-share svg { width: 16px; height: 16px; fill: currentColor; }

/* ───────── article prose ───────── */
.bp-article {
  max-width: var(--bp-prose);
  margin: 0;
}
.bp-article .post-content {
  font-size: 17px;
  line-height: 1.72;
  color: var(--bp-fg-2);
}
.bp-article .post-content > *:first-child { margin-top: 0; }

.bp-article .post-content h2 {
  font-size: clamp(24px, 2.6vw, 32px);
  line-height: 1.2;
  letter-spacing: -0.025em;
  font-weight: 500;
  color: var(--bp-fg);
  margin: 56px 0 20px;
  scroll-margin-top: 110px;
}
.bp-article .post-content h3 {
  font-size: clamp(19px, 1.6vw, 22px);
  line-height: 1.3;
  letter-spacing: -0.015em;
  font-weight: 500;
  color: var(--bp-fg);
  margin: 36px 0 14px;
  scroll-margin-top: 110px;
}
.bp-article .post-content p { margin: 0 0 22px; }
.bp-article .post-content p.lead {
  font-size: 20px;
  line-height: 1.55;
  color: var(--bp-fg);
  margin: 0 0 32px;
  padding: 24px 28px;
  border-left: 3px solid var(--bp-accent);
  background: var(--bp-bg-1);
  border-radius: 0 var(--bp-radius) var(--bp-radius) 0;
}
.bp-article .post-content p.lead strong { color: var(--bp-fg); font-weight: 500; }

.bp-article .post-content strong { color: var(--bp-fg); font-weight: 500; }
.bp-article .post-content em { color: var(--bp-fg-2); font-style: italic; }

.bp-article .post-content a {
  color: var(--bp-fg);
  text-decoration: underline;
  text-decoration-color: var(--bp-fg-4);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: text-decoration-color .15s ease, color .15s ease;
}
.bp-article .post-content a:hover {
  color: var(--bp-accent);
  text-decoration-color: var(--bp-accent);
}

.bp-article .post-content ul,
.bp-article .post-content ol {
  margin: 0 0 24px;
  padding-left: 24px;
}
.bp-article .post-content li { margin: 0 0 10px; }
.bp-article .post-content li::marker { color: var(--bp-fg-4); }

.bp-article .post-content hr {
  border: 0;
  height: 1px;
  background: var(--bp-line);
  margin: 48px 0;
}

.bp-article .post-content blockquote {
  margin: 32px 0;
  padding: 20px 28px;
  border-left: 3px solid var(--bp-accent);
  background: var(--bp-bg-1);
  border-radius: 0 var(--bp-radius) var(--bp-radius) 0;
  font-size: 18px;
  color: var(--bp-fg);
  font-style: normal;
}

.bp-article .post-content code {
  font-family: "Geist Mono", ui-monospace, monospace;
  font-size: 0.92em;
  background: var(--bp-bg-2);
  border: 1px solid var(--bp-line);
  border-radius: 6px;
  padding: 2px 6px;
  color: var(--bp-fg);
}

/* ───────── tables (the killer feature) ───────── */
.bp-article .post-content table,
.bp-article .post-content .comparison-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 32px 0;
  background: var(--bp-bg-1);
  border: 1px solid var(--bp-line);
  border-radius: var(--bp-radius);
  overflow: hidden;
  font-size: 15px;
}
.bp-article .post-content th,
.bp-article .post-content .comparison-table th {
  text-align: left;
  font-weight: 500;
  font-family: "Geist Mono", ui-monospace, monospace;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 14px 18px;
  background: var(--bp-bg-2);
  color: var(--bp-fg-3);
  border-bottom: 1px solid var(--bp-line);
  vertical-align: middle;
}
.bp-article .post-content td,
.bp-article .post-content .comparison-table td {
  padding: 16px 18px;
  border-top: 1px solid var(--bp-line);
  color: var(--bp-fg-2);
  vertical-align: top;
}
.bp-article .post-content tr:first-child td { border-top: 0; }
.bp-article .post-content tr:nth-child(even) td { background: rgba(255,255,255,0.015); }
.bp-article .post-content td strong { color: var(--bp-fg); font-weight: 500; }

@media (max-width: 720px) {
  .bp-article .post-content table,
  .bp-article .post-content .comparison-table {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
}

/* ───────── inline CTA block ───────── */
.bp-inline-cta {
  margin: 48px 0;
  padding: 28px 32px;
  background: var(--bp-bg-1);
  border: 1px solid var(--bp-line);
  border-radius: var(--bp-radius-lg);
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px; flex-wrap: wrap;
}
.bp-inline-cta-text {
  font-size: 16px;
  color: var(--bp-fg-2);
}
.bp-inline-cta-text strong { color: var(--bp-fg); }

/* ───────── styling helper for cta link inside content ───────── */
.bp-article .post-content a.cta-link {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 20px; border-radius: 999px;
  background: var(--bp-fg); color: var(--bp-bg);
  font-weight: 500;
  text-decoration: none;
  margin: 8px 0;
  transition: transform .2s ease, box-shadow .2s ease;
}
.bp-article .post-content a.cta-link:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 30px rgba(255,255,255,0.08);
  text-decoration: none;
  color: var(--bp-bg);
}

/* ───────── footer CTA section ───────── */
.bp-footer-cta {
  position: relative;
  padding: 80px var(--bp-pad);
  border-top: 1px solid var(--bp-line);
  overflow: hidden;
}
.bp-footer-cta-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--bp-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--bp-line) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(60vw 40vh at 50% 60%, black 20%, transparent 75%);
  -webkit-mask-image: radial-gradient(60vw 40vh at 50% 60%, black 20%, transparent 75%);
  opacity: 0.3;
  pointer-events: none;
}
.bp-footer-cta-inner {
  position: relative; z-index: 2;
  max-width: 760px; margin: 0 auto;
  text-align: center;
}
.bp-footer-cta h2 {
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.1;
  letter-spacing: -0.03em;
  font-weight: 480;
  color: var(--bp-fg);
  margin: 14px 0 16px;
}
.bp-footer-cta p {
  color: var(--bp-fg-2);
  font-size: 17px;
  line-height: 1.55;
  margin: 0 0 32px;
}
.bp-footer-cta .ctas { display: inline-flex; gap: 12px; flex-wrap: wrap; justify-content: center; }

/* ───────── related posts ───────── */
.bp-related {
  padding: 64px var(--bp-pad);
  border-top: 1px solid var(--bp-line);
}
.bp-related-inner { max-width: var(--bp-maxw); margin: 0 auto; }
.bp-related h3 {
  font-family: "Geist Mono", ui-monospace, monospace;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--bp-fg-3);
  margin: 0 0 24px;
}
.bp-related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
@media (max-width: 900px) { .bp-related-grid { grid-template-columns: 1fr; } }

.bp-related-card {
  display: block;
  padding: 24px;
  background: var(--bp-bg-1);
  border: 1px solid var(--bp-line);
  border-radius: var(--bp-radius);
  color: var(--bp-fg);
  transition: transform .2s ease, border-color .2s ease, background .2s ease;
}
.bp-related-card:hover {
  text-decoration: none;
  transform: translateY(-2px);
  border-color: var(--bp-line-2);
  background: var(--bp-bg-2);
}
.bp-related-card .meta {
  font-family: "Geist Mono", ui-monospace, monospace;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--bp-fg-4);
  margin-bottom: 12px;
}
.bp-related-card .title {
  font-size: 17px;
  line-height: 1.3;
  font-weight: 500;
  color: var(--bp-fg);
  margin: 0 0 12px;
}
.bp-related-card .excerpt {
  font-size: 14px;
  line-height: 1.5;
  color: var(--bp-fg-3);
  margin: 0;
}

/* ───────── post-nav (prev/next) ───────── */
.bp-post-nav {
  padding: 32px var(--bp-pad) 64px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  max-width: var(--bp-maxw);
  margin: 0 auto;
}
@media (max-width: 720px) { .bp-post-nav { grid-template-columns: 1fr; } }

.bp-post-nav a {
  display: block;
  padding: 18px 22px;
  border: 1px solid var(--bp-line);
  border-radius: var(--bp-radius);
  background: var(--bp-bg-1);
  color: var(--bp-fg-2);
  transition: border-color .2s ease, background .2s ease, color .2s ease;
}
.bp-post-nav a:hover { text-decoration: none; border-color: var(--bp-line-2); color: var(--bp-fg); background: var(--bp-bg-2); }
.bp-post-nav .label {
  font-family: "Geist Mono", ui-monospace, monospace;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--bp-fg-4);
  display: block;
  margin-bottom: 6px;
}
.bp-post-nav .arrow { color: var(--bp-fg-4); }
.bp-post-nav .next { text-align: right; }

/* ───────── footer ───────── */
.bp-footer {
  border-top: 1px solid var(--bp-line);
  padding: 32px var(--bp-pad);
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 16px;
  max-width: var(--bp-maxw);
  margin: 0 auto;
  color: var(--bp-fg-3);
  font-size: 13px;
}
.bp-footer-left { display: flex; align-items: center; gap: 14px; }
.bp-footer-links { display: flex; gap: 22px; }
.bp-footer-links a { color: var(--bp-fg-3); }
.bp-footer-links a:hover { color: var(--bp-fg); text-decoration: none; }

/* ───────── mobile TOC drawer ───────── */
.bp-toc-mobile {
  display: none;
  margin: 0 0 32px;
  padding: 16px 20px;
  background: var(--bp-bg-1);
  border: 1px solid var(--bp-line);
  border-radius: var(--bp-radius);
}
.bp-toc-mobile summary {
  cursor: pointer;
  list-style: none;
  display: flex; align-items: center; justify-content: space-between;
  font-size: 14px;
  color: var(--bp-fg-2);
}
.bp-toc-mobile summary::-webkit-details-marker { display: none; }
.bp-toc-mobile[open] summary { color: var(--bp-fg); margin-bottom: 12px; }
.bp-toc-mobile .bp-toc-list a { font-size: 14px; }

@media (max-width: 1100px) {
  .bp-toc-mobile { display: block; }
}