/* Byteable blog post template — v1
   Two-column sticky-heading article layout, dark chrome, single accent.
   All values below are the design tokens. Nothing else is invented. */

:root {
  --bt-ink:        #14161A;  /* body text on light */
  --bt-black:      #0B0C0E;  /* chrome / dark sections */
  --bt-bone:       #F6F4EF;  /* page background, text on dark */
  --bt-bone-2:     #EDEAE2;  /* card fill on light */
  --bt-accent:     #E4572E;  /* single accent — set per post, see themes at the bottom */
  --bt-accent-ink: #B03A1A;  /* accent darkened until it is text-safe on bone */
  --bt-on-accent:  #0B0C0E;  /* text sitting ON the accent ground */
  --bt-btn-bg:     #0B0C0E;  /* CTA button on the accent ground */
  --bt-btn-fg:     #F6F4EF;
  --bt-muted:      #8A8478;  /* meta text on light */
  --bt-muted-2:    #4A4740;  /* secondary body on light */
  --bt-rule:       rgba(20, 22, 26, 0.14);
  --bt-rule-dark:  rgba(255, 255, 255, 0.14);

  --bt-sans:  'Space Grotesk', system-ui, sans-serif;   /* headings, UI */
  --bt-serif: 'Source Serif 4', Georgia, serif;         /* body copy */
  --bt-mono:  'JetBrains Mono', ui-monospace, monospace;/* eyebrows, meta */

  --bt-max:   1080px;  /* content column max width */
  --bt-gut:   32px;    /* page gutter */
}

html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bt-bone);
  color: var(--bt-ink);
  font-family: var(--bt-serif);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--bt-accent-ink); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: var(--bt-ink); }
::selection { background: var(--bt-accent); color: #fff; }

.bt-wrap { max-width: var(--bt-max); margin: 0 auto; padding-inline: var(--bt-gut); }

/* ---------- sticky chrome ---------- */
.bt-bar {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
  padding: 14px var(--bt-gut);
  background: rgba(11, 12, 14, 0.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.bt-bar__brand {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--bt-sans); font-weight: 700; font-size: 16px;
  letter-spacing: -0.01em; color: var(--bt-bone);
}
.bt-bar__brand::before { content: ""; width: 10px; height: 10px; background: var(--bt-accent); border-radius: 2px; }
.bt-bar__right {
  display: flex; align-items: center; gap: 20px; min-width: 0; overflow: hidden;
  font-family: var(--bt-mono); font-size: 11px; letter-spacing: 0.08em;
  text-transform: uppercase; color: rgba(246, 244, 239, 0.55);
}
.bt-bar__series { white-space: nowrap; }
.bt-btn {
  background: var(--bt-accent); color: var(--bt-on-accent);
  text-decoration: none; font-weight: 700; padding: 8px 14px; border-radius: 2px;
  white-space: nowrap; flex: none;
}
.bt-btn:hover { background: var(--bt-bone); color: var(--bt-black); }

/* ---------- hero ---------- */
.bt-hero { background: var(--bt-black); color: var(--bt-bone); padding: 96px var(--bt-gut) 88px; }
.bt-eyebrow {
  font-family: var(--bt-mono); font-size: 12px; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--bt-accent); margin-bottom: 28px;
}
.bt-hero h1 {
  font-family: var(--bt-sans); font-weight: 700;
  font-size: clamp(44px, 6.4vw, 86px); line-height: 0.98; letter-spacing: -0.035em;
  margin: 0 0 32px; max-width: 16ch; text-wrap: balance;
}
.bt-hero__dek {
  font-size: clamp(19px, 2vw, 24px); line-height: 1.5;
  color: rgba(246, 244, 239, 0.72); max-width: 60ch; margin: 0 0 44px; text-wrap: pretty;
}
.bt-meta {
  display: flex; flex-wrap: wrap; gap: 14px 40px;
  font-family: var(--bt-mono); font-size: 11px; letter-spacing: 0.1em;
  text-transform: uppercase; color: rgba(246, 244, 239, 0.45);
  padding-top: 28px; border-top: 1px solid var(--bt-rule-dark);
}

/* ---------- stat band (0–3 stats, directly under hero) ---------- */
.bt-stats { background: var(--bt-black); padding: 0 var(--bt-gut) 96px; }
.bt-stats__grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1px; background: var(--bt-rule-dark); border: 1px solid var(--bt-rule-dark);
}
.bt-stat { background: var(--bt-black); padding: 36px var(--bt-gut); }
.bt-stat__n {
  font-family: var(--bt-sans); font-weight: 700; font-size: 64px;
  line-height: 1; letter-spacing: -0.04em; color: var(--bt-accent);
}
.bt-stat p { font-size: 16px; line-height: 1.5; color: rgba(246, 244, 239, 0.7); margin: 16px 0 0; }
.bt-stat__src {
  font-family: var(--bt-mono); font-size: 10px; letter-spacing: 0.1em;
  text-transform: uppercase; color: rgba(246, 244, 239, 0.4); margin-top: 16px;
}
.bt-stat__src a { color: rgba(246, 244, 239, 0.5); }

/* ---------- two-column section: sticky heading + body ---------- */
.bt-section { padding: 88px 0 0; }
.bt-section__grid {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr);
  gap: 56px; align-items: start;
}
.bt-section h2 {
  position: sticky; top: 96px; margin: 0;
  font-family: var(--bt-sans); font-weight: 700; font-size: 34px;
  line-height: 1.05; letter-spacing: -0.025em;
}
.bt-section h2 .bt-sub {
  display: block; font-family: var(--bt-mono); font-size: 11px; font-weight: 400;
  letter-spacing: 0.12em; text-transform: uppercase; color: var(--bt-muted); margin-top: 14px;
}
.bt-body { font-size: 20px; line-height: 1.65; max-width: 66ch; }
.bt-body > p { margin: 0 0 26px; text-wrap: pretty; }
.bt-body > p:last-child { margin-bottom: 0; }

/* question lead-in (the bolded rhetorical question that opens a section) */
.bt-q {
  font-family: var(--bt-sans); font-weight: 500; font-size: 21px;
  line-height: 1.35; color: var(--bt-accent-ink); margin: 0 0 22px;
}

/* subsection inside a section */
.bt-sub-block { border-top: 2px solid var(--bt-ink); padding-top: 24px; margin-bottom: 48px; }
.bt-sub-block:last-child { margin-bottom: 0; }
.bt-sub-block h3 {
  font-family: var(--bt-sans); font-weight: 700; font-size: 24px;
  letter-spacing: -0.02em; margin: 0 0 22px;
}
.bt-sub-block h3 + .bt-q { margin-top: -16px; }
.bt-sub-block p { margin: 0 0 22px; text-wrap: pretty; }
.bt-sub-block p:last-child { margin-bottom: 0; }

/* ---------- callouts ---------- */
.bt-pull {
  margin: 44px 0; padding: 0 0 0 28px; border-left: 3px solid var(--bt-accent);
  font-family: var(--bt-sans); font-weight: 600; font-size: 26px;
  line-height: 1.3; letter-spacing: -0.015em;
}
.bt-contrarian { background: var(--bt-black); color: var(--bt-bone); padding: 30px 30px 32px; margin: 36px 0; }
.bt-contrarian__label {
  font-family: var(--bt-mono); font-size: 10px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--bt-accent); margin-bottom: 14px;
}
.bt-contrarian__claim {
  font-family: var(--bt-sans); font-weight: 600; font-size: 24px;
  line-height: 1.3; letter-spacing: -0.015em; margin: 0 0 14px;
}
.bt-contrarian p { font-size: 17px; line-height: 1.55; margin: 0; color: rgba(246, 244, 239, 0.72); }

/* ---------- comparison (2 columns, A vs B) ---------- */
.bt-compare {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2px; background: var(--bt-rule); border: 2px solid var(--bt-ink); margin: 36px 0;
}
.bt-compare__col { background: var(--bt-bone); padding: 26px 24px; }
.bt-compare__col--a { background: var(--bt-bone-2); }
.bt-compare__label {
  font-family: var(--bt-mono); font-size: 10px; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--bt-muted); margin-bottom: 14px;
}
.bt-compare__col--a .bt-compare__label { color: var(--bt-accent-ink); }
.bt-compare p { font-size: 17px; line-height: 1.55; margin: 0 0 14px; }
.bt-compare p:last-child { margin: 0; color: var(--bt-muted-2); }

/* ---------- labelled example rows (law firm / retailer / medical office) ---------- */
.bt-rows { display: grid; gap: 2px; background: var(--bt-rule); border: 1px solid var(--bt-rule); margin: 36px 0; }
.bt-row {
  background: var(--bt-bone-2); padding: 24px 26px;
  display: grid; grid-template-columns: auto 1fr; gap: 22px; align-items: start;
}
.bt-row__label {
  font-family: var(--bt-mono); font-size: 10px; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--bt-accent-ink); padding-top: 5px; white-space: nowrap;
}
.bt-row p { font-size: 17px; line-height: 1.55; margin: 0; }

/* ---------- numbered list (TL;DR, checkpoints) ---------- */
.bt-numbered { margin: 0; padding: 0; list-style: none; display: grid; gap: 22px; }
.bt-numbered li { display: grid; grid-template-columns: auto 1fr; gap: 18px; font-size: 19px; line-height: 1.55; }
.bt-numbered__n { font-family: var(--bt-mono); font-size: 12px; color: var(--bt-accent); padding-top: 6px; }
.bt-checklist { display: grid; gap: 16px; }
.bt-check { display: grid; grid-template-columns: auto 1fr; gap: 20px; border-top: 1px solid rgba(20, 22, 26, 0.2); padding-top: 18px; }
.bt-check p { margin: 0; font-size: 18px; line-height: 1.55; }
.bt-check strong { font-family: var(--bt-sans); font-weight: 600; }

/* ---------- TL;DR band ---------- */
.bt-tldr { padding: 80px var(--bt-gut); border-bottom: 1px solid rgba(20, 22, 26, 0.12); }
.bt-tldr__grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr); gap: 56px; align-items: start; }
.bt-tldr__head { position: sticky; top: 96px; }
.bt-tldr__kicker {
  font-family: var(--bt-mono); font-size: 11px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--bt-muted); margin-bottom: 18px;
}
.bt-tldr__title { font-family: var(--bt-sans); font-weight: 600; font-size: 26px; line-height: 1.15; letter-spacing: -0.02em; }

/* ---------- 3-stage strip (Concepts / Built / Sustained) ---------- */
.bt-stages { display: grid; grid-template-columns: repeat(3, 1fr); border: 2px solid var(--bt-ink); margin: 36px 0; font-family: var(--bt-sans); }
.bt-stage { padding: 22px 20px; background: var(--bt-bone-2); border-left: 2px solid var(--bt-ink); }
.bt-stage:first-child { border-left: 0; background: var(--bt-accent); color: var(--bt-on-accent); }
.bt-stage__n { font-family: var(--bt-mono); font-size: 10px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--bt-muted); }
.bt-stage:first-child .bt-stage__n { color: inherit; opacity: 0.7; }
.bt-stage__name { font-weight: 700; font-size: 22px; letter-spacing: -0.02em; margin-top: 8px; }
.bt-stage__note { font-family: var(--bt-serif); font-size: 15px; line-height: 1.45; margin-top: 10px; }

/* ---------- CTA ---------- */
.bt-cta { background: var(--bt-accent); color: var(--bt-on-accent); margin-top: 96px; padding: 88px var(--bt-gut); }
.bt-cta__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 48px; align-items: end; }
.bt-cta__kicker { font-family: var(--bt-mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; margin-bottom: 22px; opacity: 0.75; }
.bt-cta h2 {
  font-family: var(--bt-sans); font-weight: 700; font-size: clamp(34px, 4.4vw, 56px);
  line-height: 1.02; letter-spacing: -0.03em; margin: 0 0 24px; max-width: 18ch; text-wrap: balance;
}
.bt-cta p { font-size: 19px; line-height: 1.55; margin: 0; max-width: 52ch; }
.bt-cta__btn {
  display: inline-block; background: var(--bt-btn-bg); color: var(--bt-btn-fg);
  text-decoration: none; font-family: var(--bt-sans); font-weight: 700;
  font-size: 19px; letter-spacing: -0.01em; padding: 20px 32px;
}
.bt-cta__btn:hover { background: var(--bt-btn-fg); color: var(--bt-btn-bg); }
.bt-cta__note { font-size: 16px; line-height: 1.5; margin: 22px 0 0; max-width: 40ch; }

/* ---------- FAQ ---------- */
.bt-faq { background: var(--bt-black); color: var(--bt-bone); padding: 88px var(--bt-gut) 96px; }
.bt-faq__grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr); gap: 56px; align-items: start; }
.bt-faq h2 { font-family: var(--bt-sans); font-weight: 700; font-size: 34px; line-height: 1.05; letter-spacing: -0.025em; margin: 0; }
.bt-faq details { border-top: 1px solid rgba(255, 255, 255, 0.18); padding: 22px 0; }
.bt-faq details:last-child { border-bottom: 1px solid rgba(255, 255, 255, 0.18); }
.bt-faq summary {
  font-family: var(--bt-sans); font-weight: 600; font-size: 21px;
  letter-spacing: -0.015em; cursor: pointer; list-style: none;
}
.bt-faq summary::-webkit-details-marker { display: none; }
.bt-faq details p { font-size: 18px; line-height: 1.6; color: rgba(246, 244, 239, 0.72); margin: 16px 0 0; max-width: 60ch; }
.bt-faq details a { color: var(--bt-accent); }

/* ---------- footer ---------- */
.bt-footer {
  background: var(--bt-black); color: rgba(246, 244, 239, 0.45);
  padding: 0 var(--bt-gut) 56px;
  font-family: var(--bt-mono); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase;
}
.bt-footer__inner {
  display: flex; flex-wrap: wrap; gap: 16px 32px; justify-content: space-between;
  border-top: 1px solid var(--bt-rule-dark); padding-top: 28px;
}
.bt-footer a { color: rgba(246, 244, 239, 0.6); }

/* ---------- responsive ---------- */
@media (max-width: 860px) {
  .bt-section__grid, .bt-tldr__grid, .bt-faq__grid { grid-template-columns: 1fr; gap: 28px; }
  .bt-section h2, .bt-tldr__head { position: static; }
  .bt-stages { grid-template-columns: 1fr; }
  .bt-stage { border-left: 0; border-top: 2px solid var(--bt-ink); }
  .bt-stage:first-child { border-top: 0; }
  .bt-hero { padding-top: 64px; padding-bottom: 64px; }
  .bt-body { font-size: 18px; }
}
@media (max-width: 620px) {
  :root { --bt-gut: 20px; }
  .bt-bar__series { display: none; }
  .bt-row { grid-template-columns: 1fr; gap: 10px; }
}

/* ================================================================
   PER-POST ACCENT THEMES
   Put the class on <body>: <body class="bt-theme-02">.
   Five accents rotate across the series; post 06 returns to 01.
   Everything else in the design is fixed — only the accent moves.
   ================================================================ */

/* 01 · 06 — Orange (the series default) */
.bt-theme-01, .bt-theme-06 {
  --bt-accent: #E4572E; --bt-accent-ink: #B03A1A;
  --bt-on-accent: #0B0C0E; --bt-btn-bg: #0B0C0E; --bt-btn-fg: #F6F4EF;
}
/* 02 · 07 — Teal */
.bt-theme-02, .bt-theme-07 {
  --bt-accent: #0F7B6C; --bt-accent-ink: #0B5E52;
  --bt-on-accent: #F6F4EF; --bt-btn-bg: #F6F4EF; --bt-btn-fg: #0B0C0E;
}
/* 03 · 08 — Gold */
.bt-theme-03, .bt-theme-08 {
  --bt-accent: #D9A21B; --bt-accent-ink: #8F6A05;
  --bt-on-accent: #0B0C0E; --bt-btn-bg: #0B0C0E; --bt-btn-fg: #F6F4EF;
}
/* 04 · 09 — Indigo */
.bt-theme-04, .bt-theme-09 {
  --bt-accent: #4E5BD8; --bt-accent-ink: #3A45AD;
  --bt-on-accent: #F6F4EF; --bt-btn-bg: #F6F4EF; --bt-btn-fg: #0B0C0E;
}
/* 05 · 10 — Crimson */
.bt-theme-05, .bt-theme-10 {
  --bt-accent: #C42348; --bt-accent-ink: #9B1636;
  --bt-on-accent: #F6F4EF; --bt-btn-bg: #F6F4EF; --bt-btn-fg: #0B0C0E;
}