/* HeltAIum — Blog (Index + Article)
   Editorial reading layout, same brand tokens as the main site. */

:root {
  --bg: #0b0a08;
  --bg-elev: #131210;
  --bg-deep: #060604;
  --ink: #ede4d3;
  --ink-mute: #b8ac94;
  --ink-dim: #7d7464;
  --ink-faint: #3e3a32;
  --accent: #e8a04b;
  --accent-hot: #ff6a1f;
  --rule: rgba(237, 228, 211, 0.10);
  --rule-mid: rgba(237, 228, 211, 0.18);
  --rule-strong: rgba(237, 228, 211, 0.32);

  --font-display: "Fraunces", "Times New Roman", serif;
  --font-sans: "Instrument Sans", -apple-system, system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;

  --max: 1200px;
  --max-prose: 720px;
  --gutter: clamp(20px, 4vw, 64px);

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { -webkit-font-smoothing: antialiased; scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.6;
  position: relative;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }

body::before {
  content: '';
  position: fixed; top: 0; left: 0; right: 0; height: 3px;
  background: var(--accent);
  z-index: 100;
}
body::after {
  content: '';
  position: fixed; inset: 0; pointer-events: none; z-index: 99;
  opacity: 0.05; mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 240 240' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ── NAV ─────────────────────────────────────────────────────────── */
.blog-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 22px var(--gutter);
  border-bottom: 1px solid var(--rule);
  position: relative;
  z-index: 2;
  max-width: var(--max);
  margin: 0 auto;
}
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-display);
  font-size: 17px; font-weight: 400; color: var(--ink);
}
.brand .mark {
  width: 14px; height: 14px; border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, var(--accent), var(--accent-hot) 60%, #5a2810);
  box-shadow: 0 0 12px rgba(232,160,75,0.4);
}
.brand sup {
  font-family: var(--font-mono); font-size: 9px; color: var(--ink-dim);
  margin-left: 2px; vertical-align: super;
}
.blog-nav .right {
  display: flex; align-items: center; gap: 18px;
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--ink-dim);
}
.blog-nav .right a { transition: color 0.3s; }
.blog-nav .right a:hover { color: var(--ink); }
.blog-nav .right a.cta {
  background: var(--accent); color: var(--bg);
  padding: 8px 14px; border-radius: 3px;
  transition: background 0.3s;
}
.blog-nav .right a.cta:hover { background: var(--ink); }

/* ── BLOG INDEX ──────────────────────────────────────────────────── */
.blog-head {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(60px, 10vw, 120px) var(--gutter) clamp(40px, 6vw, 64px);
}
.blog-head .meta {
  display: flex; align-items: center; gap: 14px;
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--ink-dim);
  margin-bottom: 28px;
}
.blog-head .meta b { color: var(--ink); font-weight: 500; }
.blog-head .meta .num { color: var(--accent); }
.blog-head h1 {
  font-family: var(--font-display);
  font-size: clamp(48px, 7vw, 88px);
  font-weight: 300;
  line-height: 1;
  letter-spacing: -0.02em;
  max-width: 14ch;
}
.blog-head h1 em { font-style: italic; color: var(--ink-mute); font-weight: 300; }
.blog-head .lead {
  margin-top: 24px;
  color: var(--ink-mute);
  font-size: 18px;
  max-width: 60ch;
}

.blog-list {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter) clamp(80px, 10vw, 140px);
  border-top: 1px solid var(--rule);
}
.blog-card {
  display: grid;
  grid-template-columns: 180px 1fr auto;
  gap: clamp(24px, 4vw, 64px);
  padding: clamp(32px, 5vw, 56px) 0;
  border-bottom: 1px solid var(--rule);
  align-items: start;
  transition: background 0.4s ease;
}
.blog-card:hover { background: linear-gradient(90deg, transparent, rgba(232,160,75,0.025), transparent); }
@media (max-width: 800px) {
  .blog-card { grid-template-columns: 1fr; gap: 14px; }
}
.blog-card .card-meta {
  display: flex; flex-direction: column; gap: 4px;
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-dim);
  padding-top: 6px;
}
.blog-card .card-meta .date { color: var(--accent); }
.blog-card .card-meta .read { color: var(--ink-faint); }
.blog-card .card-body h2 {
  font-family: var(--font-display);
  font-size: clamp(26px, 3vw, 36px);
  font-weight: 300;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin-bottom: 12px;
  color: var(--ink);
  transition: color 0.3s;
}
.blog-card:hover .card-body h2 { color: var(--accent); }
.blog-card .card-body h2 em { font-style: italic; color: var(--ink-mute); font-weight: 300; }
.blog-card:hover .card-body h2 em { color: var(--ink-mute); }
.blog-card .card-body p {
  color: var(--ink-mute);
  font-size: 15px;
  line-height: 1.55;
  max-width: 60ch;
}
.blog-card .card-tag {
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-dim);
  padding: 6px 12px;
  border: 1px solid var(--rule-mid);
  border-radius: 3px;
  white-space: nowrap;
  transition: color 0.3s, border-color 0.3s;
  align-self: start;
  margin-top: 6px;
}
.blog-card:hover .card-tag { color: var(--accent); border-color: var(--accent); }
@media (max-width: 800px) {
  .blog-card .card-tag { justify-self: start; margin-top: 8px; }
}

.blog-empty {
  padding: clamp(60px, 8vw, 100px) 0;
  font-family: var(--font-mono);
  font-size: 12px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--ink-faint);
  text-align: center;
  border-bottom: 1px solid var(--rule);
}

/* ── ARTICLE ─────────────────────────────────────────────────────── */
.article-head {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(60px, 10vw, 100px) var(--gutter) clamp(36px, 5vw, 56px);
  position: relative;
}
.article-head .crumb {
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-dim);
  margin-bottom: 28px;
  display: inline-flex; gap: 12px; align-items: center;
}
.article-head .crumb a { transition: color 0.3s; }
.article-head .crumb a:hover { color: var(--ink); }
.article-head .crumb .sep { color: var(--ink-faint); }
.article-head .crumb .current { color: var(--accent); }
.article-head .meta {
  display: flex; flex-wrap: wrap; gap: 14px; align-items: center;
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-dim);
  margin-bottom: 32px;
}
.article-head .meta .date { color: var(--accent); }
.article-head .meta .read { color: var(--ink-faint); }
.article-head .meta .tag {
  border: 1px solid var(--rule-mid);
  padding: 4px 10px; border-radius: 3px;
  color: var(--ink-mute);
}
.article-head h1 {
  font-family: var(--font-display);
  font-size: clamp(38px, 5.4vw, 68px);
  font-weight: 300;
  line-height: 1.05;
  letter-spacing: -0.02em;
  max-width: 22ch;
  color: var(--ink);
}
.article-head h1 em { font-style: italic; color: var(--ink-mute); font-weight: 300; }
.article-head .deck {
  margin-top: 24px;
  font-size: 19px;
  line-height: 1.55;
  color: var(--ink-mute);
  max-width: 56ch;
}
.article-head .deck em { color: var(--ink); font-style: italic; }

.article-byline {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
  border-bottom: 1px solid var(--rule);
}
.article-byline-inner {
  padding: 20px 0;
  display: flex; gap: 14px; align-items: center;
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-dim);
  flex-wrap: wrap;
}
.article-byline-inner .author { color: var(--ink); font-weight: 500; }
.article-byline-inner .author::before {
  content: '';
  display: inline-block;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, var(--accent), var(--accent-hot) 60%, #5a2810);
  vertical-align: middle;
  margin-right: 10px;
}
.article-byline-inner .sep { color: var(--ink-faint); }

/* TOC sidebar */
.article-wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(40px, 6vw, 72px) var(--gutter);
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: clamp(40px, 5vw, 80px);
  align-items: start;
}
@media (max-width: 1000px) {
  .article-wrap { grid-template-columns: 1fr; gap: 32px; }
}
.article-toc {
  position: sticky;
  top: 30px;
  align-self: start;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
@media (max-width: 1000px) {
  .article-toc { position: relative; top: 0; padding-bottom: 24px; border-bottom: 1px solid var(--rule); }
}
.article-toc .toc-label {
  color: var(--ink-faint);
  margin-bottom: 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--rule);
}
.article-toc ol {
  list-style: none;
  display: flex; flex-direction: column;
  gap: 10px;
  counter-reset: toc;
}
.article-toc ol li {
  counter-increment: toc;
  position: relative;
  padding-left: 28px;
}
.article-toc ol li::before {
  content: counter(toc, decimal-leading-zero);
  position: absolute;
  left: 0; top: 1px;
  font-size: 10px;
  color: var(--ink-faint);
}
.article-toc ol li a {
  color: var(--ink-dim);
  line-height: 1.4;
  transition: color 0.3s;
  display: block;
}
.article-toc ol li a:hover { color: var(--ink); }

/* PROSE */
.article-prose {
  max-width: var(--max-prose);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.7;
  color: var(--ink);
}
.article-prose h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.4vw, 40px);
  font-weight: 300;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: clamp(48px, 6vw, 72px) 0 18px;
  scroll-margin-top: 28px;
  position: relative;
}
.article-prose h2 em { font-style: italic; color: var(--ink-mute); font-weight: 300; }
.article-prose h2::before {
  content: '§';
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  position: absolute;
  left: -28px;
  top: 18px;
}
@media (max-width: 700px) { .article-prose h2::before { display: none; } }
.article-prose h3 {
  font-family: var(--font-display);
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 400;
  margin: 32px 0 14px;
  color: var(--ink);
}
.article-prose h3 em { font-style: italic; color: var(--ink-mute); font-weight: 300; }

.article-prose p {
  margin: 0 0 18px;
  color: var(--ink-mute);
}
.article-prose p strong, .article-prose p b { color: var(--ink); font-weight: 500; }
.article-prose p em { color: var(--ink); font-style: italic; }
.article-prose a {
  color: var(--accent);
  border-bottom: 1px solid rgba(232,160,75,0.3);
  transition: border-color 0.3s, color 0.3s;
}
.article-prose a:hover { border-color: var(--accent); color: var(--ink); }

.article-prose ul, .article-prose ol {
  margin: 8px 0 22px;
  padding-left: 0;
  list-style: none;
}
.article-prose li {
  margin: 8px 0;
  padding-left: 22px;
  position: relative;
  color: var(--ink-mute);
  line-height: 1.55;
}
.article-prose ul li::before {
  content: '+';
  position: absolute;
  left: 0; top: 0;
  font-family: var(--font-mono);
  color: var(--accent);
}
.article-prose ol {
  counter-reset: olc;
}
.article-prose ol li {
  counter-increment: olc;
}
.article-prose ol li::before {
  content: counter(olc, decimal-leading-zero);
  position: absolute;
  left: 0; top: 1px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
}
.article-prose li b { color: var(--ink); }
.article-prose li em { color: var(--ink); font-style: italic; }

.article-prose blockquote {
  margin: clamp(28px, 4vw, 40px) 0;
  padding: clamp(24px, 3vw, 32px) clamp(28px, 4vw, 40px);
  border-left: 2px solid var(--accent);
  background: linear-gradient(90deg, rgba(232,160,75,0.04), transparent);
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(20px, 2.2vw, 24px);
  font-weight: 300;
  line-height: 1.45;
  color: var(--ink);
  letter-spacing: -0.005em;
}
.article-prose blockquote cite {
  display: block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-style: normal;
  color: var(--ink-dim);
  font-weight: 400;
}

.article-prose .callout {
  margin: clamp(28px, 4vw, 40px) 0;
  padding: clamp(20px, 3vw, 28px);
  border: 1px solid var(--rule-mid);
  background: var(--bg-elev);
  border-radius: 4px;
}
.article-prose .callout .callout-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
  display: block;
}
.article-prose .callout p:last-child { margin-bottom: 0; }

.article-prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-family: var(--font-sans);
  font-size: 14px;
}
.article-prose table th, .article-prose table td {
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}
.article-prose table th {
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-dim);
  font-weight: 400;
  border-bottom-color: var(--rule-mid);
}
.article-prose table td {
  color: var(--ink-mute);
}
.article-prose table td b { color: var(--ink); font-weight: 500; }
.article-prose table tr:hover td { background: rgba(232,160,75,0.02); }

/* CTA in article */
.article-cta {
  margin: clamp(60px, 8vw, 100px) 0 0;
  padding: clamp(32px, 5vw, 56px);
  background: linear-gradient(180deg, var(--bg-elev), var(--bg-deep));
  border: 1px solid var(--rule-mid);
  border-radius: 4px;
  text-align: center;
}
.article-cta .label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 18px;
  display: block;
}
.article-cta h3 {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.4vw, 40px);
  font-weight: 300;
  line-height: 1.1;
  margin-bottom: 14px;
  color: var(--ink);
}
.article-cta h3 em { font-style: italic; color: var(--ink-mute); font-weight: 300; }
.article-cta p {
  color: var(--ink-mute);
  max-width: 56ch;
  margin: 0 auto 28px;
}
.article-cta .btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 26px;
  background: var(--accent);
  color: var(--bg);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  border-radius: 3px;
  transition: background 0.3s, transform 0.3s var(--ease-out);
}
.article-cta .btn:hover { background: var(--ink); transform: translateY(-2px); }
.article-cta .btn .arr {
  font-family: var(--font-display); font-style: italic; font-size: 14px;
  transition: transform 0.3s var(--ease-out);
}
.article-cta .btn:hover .arr { transform: translateX(4px); }

/* ── FOOTER ──────────────────────────────────────────────────────── */
.blog-footer {
  border-top: 1px solid var(--rule);
  padding: 32px var(--gutter);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-dim);
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
.blog-footer .dot {
  display: inline-block; width: 4px; height: 4px;
  background: var(--accent); border-radius: 50%;
  margin: 0 12px; vertical-align: middle;
}
.blog-footer .links {
  display: inline-flex; gap: 18px;
}
.blog-footer .links a {
  color: var(--ink-faint); transition: color 0.3s;
}
.blog-footer .links a:hover { color: var(--ink); }

/* Reading progress bar */
.reading-progress {
  position: fixed;
  top: 3px; left: 0;
  width: 0%;
  height: 1px;
  background: var(--accent);
  z-index: 101;
  transition: width 0.05s linear;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}