/*
Theme Name: CalculusConcepts
Theme URI: https://calculusconcepts.com
Author: CalculusConcepts
Description: Editorial calculus education theme matching the original HTML site design exactly.
Version: 1.0.0
Requires at least: 6.0
Requires PHP: 7.4
License: GNU General Public License v2 or later
Text Domain: calculusconcepts
*/

/* ============================================================
   ORIGINAL SITE CSS — extracted directly from HTML source
   Variable names: --ink --paper --red --serif --sans --mono
   These are set dynamically via wp_add_inline_style()
   ============================================================ */


/* ── TOKENS ─────────────────────────────────────────────────────────────── */
:root {
  --ink:      #0d1117;
  --paper:    #f7f4ef;
  --cream:    #ede9e1;
  --white:    #ffffff;
  --red:      #c84b2f;
  --blue:     #1d4ed8;
  --muted:    #7a7267;
  --rule:     #d4cfc6;
  --serif:    'Playfair Display', Georgia, serif;
  --sans:     'DM Sans', system-ui, sans-serif;
  --mono:     'DM Mono', monospace;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.7;
  font-size: 16px;
}

/* ── NAV ─────────────────────────────────────────────────────────────────── */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--ink);
  border-bottom: 2px solid var(--red);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  height: 58px;
}
.nav-logo {
  font-family: var(--serif);
  font-weight: 900;
  font-size: 1.15rem;
  color: var(--paper);
  text-decoration: none;
  letter-spacing: -0.01em;
}
.nav-logo span { color: var(--red); }
.nav-links { display: flex; gap: 6px; align-items: center; }
.nav-links a {
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #a09890;
  text-decoration: none;
  padding: 6px 14px;
  border-radius: 2px;
  transition: color 0.15s, background 0.15s;
}
.nav-links a:hover { color: var(--paper); }
.nav-links .nav-cta {
  background: var(--red);
  color: var(--paper);
  padding: 6px 16px;
}
.nav-links .nav-cta:hover { background: #a83a20; color: var(--paper); }

/* ── MASTHEAD ────────────────────────────────────────────────────────────── */
.masthead {
  background: var(--ink);
  padding: 64px 40px 0;
  border-bottom: 3px solid var(--rule);
  overflow: hidden;
  position: relative;
}
.masthead-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 60px;
  align-items: end;
}
.masthead-eyebrow {
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--red);
  margin-bottom: 18px;
}
.masthead-title {
  font-family: var(--serif);
  font-size: clamp(2.8rem, 5vw, 4.2rem);
  font-weight: 900;
  line-height: 1.08;
  color: var(--paper);
  letter-spacing: -0.02em;
  margin-bottom: 22px;
}
.masthead-title em {
  font-style: italic;
  color: var(--red);
}
.masthead-deck {
  font-size: 1.05rem;
  color: #a09890;
  line-height: 1.65;
  max-width: 520px;
  margin-bottom: 32px;
  font-weight: 300;
}
.masthead-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 50px; }
.btn-primary {
  font-family: var(--mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  background: var(--red);
  color: #fff;
  padding: 13px 28px;
  text-decoration: none;
  border-radius: 2px;
  transition: background 0.15s;
}
.btn-primary:hover { background: #a83a20; }
.btn-secondary {
  font-family: var(--mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  background: transparent;
  color: var(--paper);
  padding: 13px 28px;
  text-decoration: none;
  border: 1px solid #444;
  border-radius: 2px;
  transition: border-color 0.15s, color 0.15s;
}
.btn-secondary:hover { border-color: var(--paper); }
.masthead-stats {
  display: flex;
  gap: 32px;
  padding-top: 28px;
  border-top: 1px solid #2a2a2a;
  margin-bottom: 50px;
}
.stat-item { display: flex; flex-direction: column; gap: 4px; }
.stat-num {
  font-family: var(--serif);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--paper);
  line-height: 1;
}
.stat-label {
  font-family: var(--mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* Masthead right — featured formula display */
.masthead-visual {
  align-self: stretch;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding-bottom: 0;
}
.formula-showcase {
  background: #111720;
  border: 1px solid #2a3040;
  border-bottom: none;
  border-radius: 6px 6px 0 0;
  padding: 28px 28px 32px;
  font-family: var(--mono);
}
.fs-label {
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: #4a5568;
  margin-bottom: 20px;
}
.fs-formula {
  font-size: 1.05rem;
  color: #e2e8f0;
  line-height: 2;
}
.fs-formula .hl-red { color: #fc8181; }
.fs-formula .hl-blue { color: #63b3ed; }
.fs-formula .hl-green { color: #68d391; }
.fs-formula .hl-yellow { color: #fbd38d; }
.fs-comment { font-size: 0.72rem; color: #4a5568; margin-top: 6px; }

/* ── TICKER ──────────────────────────────────────────────────────────────── */
.ticker {
  background: var(--red);
  padding: 10px 0;
  overflow: hidden;
  white-space: nowrap;
}
.ticker-inner {
  display: inline-flex;
  gap: 0;
  animation: ticker-scroll 30s linear infinite;
}
.ticker-item {
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(255,255,255,0.9);
  padding: 0 32px;
  border-right: 1px solid rgba(255,255,255,0.25);
}
@keyframes ticker-scroll {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* ── MAIN LAYOUT ─────────────────────────────────────────────────────────── */
.page-body {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 40px;
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 64px;
  padding-top: 56px;
  padding-bottom: 80px;
}

/* ── ARTICLE AREA ────────────────────────────────────────────────────────── */
.article-header { margin-bottom: 36px; }
.article-kicker {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--red);
  background: #fdf0ed;
  padding: 5px 10px;
  border-radius: 2px;
  margin-bottom: 18px;
}
.article-h1 {
  font-family: var(--serif);
  font-size: clamp(2rem, 3.5vw, 2.8rem);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: 18px;
}
.article-deck-main {
  font-size: 1.1rem;
  line-height: 1.65;
  color: #3d3830;
  max-width: 640px;
  font-weight: 300;
  margin-bottom: 22px;
}
.article-byline {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  margin-bottom: 32px;
}
.byline-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--ink);
  color: #fff;
  font-family: var(--mono);
  font-size: 0.72rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.byline-name { font-weight: 600; font-size: 0.88rem; line-height: 1.3; }
.byline-meta { font-size: 0.75rem; color: var(--muted); font-family: var(--mono); }
.byline-right { margin-left: auto; display: flex; gap: 10px; align-items: center; }
.read-badge {
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--muted);
  background: var(--cream);
  padding: 4px 9px;
  border-radius: 2px;
}
.reviewed-badge {
  background: #d4edda;
  color: #155724;
  font-size: 0.65rem;
  padding: 4px 8px;
  border-radius: 2px;
  font-family: var(--mono);
}

/* Drop cap */
.article-body > p:first-of-type::first-letter {
  font-family: var(--serif);
  font-size: 4.2rem;
  font-weight: 900;
  line-height: 0.85;
  float: left;
  margin-right: 8px;
  margin-top: 6px;
  color: var(--red);
}

/* Article prose */
.article-body h2 {
  font-family: var(--serif);
  font-size: 1.55rem;
  font-weight: 700;
  margin: 2.4rem 0 0.9rem;
  color: var(--ink);
  letter-spacing: -0.01em;
  border-bottom: 2px solid var(--rule);
  padding-bottom: 8px;
}
.article-body h3 {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 700;
  margin: 1.8rem 0 0.6rem;
}
.article-body p {
  margin-bottom: 1.3rem;
  color: #1e1a16;
  line-height: 1.78;
  font-size: 0.97rem;
}
.article-body ul, .article-body ol {
  margin: 0.8rem 0 1.3rem 1.5rem;
}
.article-body li {
  margin-bottom: 0.5rem;
  font-size: 0.97rem;
  line-height: 1.7;
  color: #1e1a16;
}
.article-body strong { font-weight: 600; }

/* TOC */
.toc-widget {
  background: var(--cream);
  border-left: 3px solid var(--red);
  padding: 18px 22px;
  margin-bottom: 32px;
  border-radius: 0 4px 4px 0;
}
.toc-title {
  font-family: var(--mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin-bottom: 10px;
}
.toc-list { list-style: none; padding: 0; margin: 0; }
.toc-list li { padding: 3px 0; }
.toc-list a {
  font-size: 0.84rem;
  color: var(--ink);
  text-decoration: none;
  font-weight: 500;
}
.toc-list a:hover { color: var(--red); }
.toc-list a::before { content: "→ "; color: var(--red); font-family: var(--mono); font-size: 0.7rem; }

/* Callout boxes */
.callout {
  background: var(--cream);
  border-left: 3px solid var(--ink);
  padding: 16px 20px;
  margin: 1.8rem 0;
  border-radius: 0 4px 4px 0;
}
.callout-blue { border-left-color: var(--blue); }
.callout-label {
  font-family: var(--mono);
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin-bottom: 8px;
}
.callout p { margin: 0; font-size: 0.92rem; line-height: 1.65; }

/* Formula blocks */
.formula {
  background: var(--ink);
  color: var(--paper);
  padding: 22px 28px;
  margin: 1.8rem 0;
  border-radius: 4px;
  font-family: var(--mono);
}
.formula-content {
  font-size: 1.05rem;
  line-height: 1.8;
  margin-bottom: 10px;
}
.hi  { color: #fc8181; font-weight: 500; }
.hi2 { color: #63b3ed; font-weight: 500; }
.formula-note { font-size: 0.72rem; color: #7a8090; letter-spacing: 0.03em; }

/* Example blocks */
.example {
  border: 2px solid var(--rule);
  border-radius: 4px;
  margin: 1.8rem 0;
  overflow: hidden;
}
.example-head {
  background: var(--cream);
  padding: 12px 18px;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--rule);
  display: flex;
  gap: 10px;
  align-items: center;
}
.example-head span { font-family: var(--mono); font-size: 0.75rem; color: var(--muted); font-weight: 400; }
.example-body { padding: 18px; }
.example-body p { margin-bottom: 0.9rem; font-size: 0.92rem; }
.example-step {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 8px 0;
  border-bottom: 1px solid var(--cream);
}
.example-step:last-child { border-bottom: none; }
.step-badge {
  font-family: var(--mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background: var(--ink);
  color: #fff;
  padding: 3px 8px;
  border-radius: 2px;
  white-space: nowrap;
  flex-shrink: 0;
  margin-top: 2px;
}
.step-text { font-size: 0.9rem; line-height: 1.6; }

/* Pull quote */
.pull-quote {
  font-family: var(--serif);
  font-size: 1.2rem;
  font-style: italic;
  color: var(--ink);
  border-left: 4px solid var(--red);
  padding: 12px 22px;
  margin: 2rem 0;
  background: var(--cream);
  line-height: 1.5;
}

/* Vis block */
.vis-block {
  margin: 1.8rem 0;
  border: 1px solid var(--rule);
  border-radius: 4px;
  overflow: hidden;
}
.vis-label {
  font-family: var(--mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  padding: 8px 14px;
  background: var(--cream);
  border-bottom: 1px solid var(--rule);
}
.vis-block svg { display: block; width: 100%; }

/* FAQ */
.faq { margin: 2.4rem 0; }
.faq-title {
  font-family: var(--serif);
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--rule);
}
.faq-item {
  border: 1px solid var(--rule);
  border-radius: 3px;
  margin-bottom: 6px;
  overflow: hidden;
}
.faq-q {
  padding: 13px 16px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  font-size: 0.9rem;
  background: var(--cream);
  user-select: none;
}
.faq-q:hover { background: var(--rule); }
.faq-icon { font-size: 0.72rem; color: var(--muted); transition: transform 0.2s; }
.faq-a {
  display: none;
  padding: 13px 16px;
  font-size: 0.88rem;
  line-height: 1.7;
  border-top: 1px solid var(--rule);
  color: #2d2820;
}

/* Article tags */
.article-tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 2rem 0 1rem; }
.a-tag {
  font-family: var(--mono);
  font-size: 0.65rem;
  background: var(--cream);
  color: var(--muted);
  padding: 4px 10px;
  border-radius: 2px;
  border: 1px solid var(--rule);
}

/* Article nav */
.article-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 2rem 0;
}
.article-nav-card {
  border: 1px solid var(--rule);
  padding: 14px 16px;
  border-radius: 3px;
  text-decoration: none;
  color: var(--ink);
  display: block;
  transition: border-color 0.15s;
}
.article-nav-card:hover { border-color: var(--ink); }
.anc-label { font-family: var(--mono); font-size: 0.62rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); margin-bottom: 4px; }
.anc-title { font-size: 0.85rem; font-weight: 600; line-height: 1.3; }

/* References */
.references-block {
  margin: 2rem 0;
  padding: 1.2rem 1.5rem;
  border-left: 3px solid var(--rule);
  background: var(--cream);
}
.references-title {
  font-family: var(--mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  margin-bottom: 10px;
}
.references-list { list-style: none; padding: 0; }
.references-list li {
  font-size: 0.82rem;
  color: var(--ink);
  padding: 4px 0;
  border-bottom: 1px solid var(--rule);
  line-height: 1.5;
}
.references-list li:last-child { border-bottom: none; }

/* Author bio */
.author-bio-block {
  display: flex;
  gap: 1.2rem;
  background: var(--cream);
  border: 2px solid var(--rule);
  border-radius: 6px;
  padding: 1.4rem;
  margin: 2.5rem 0 1.5rem;
}
.author-bio-avatar {
  width: 56px; height: 56px;
  border-radius: 50%;
  background: var(--ink); color: #fff;
  font-family: var(--mono); font-size: 1rem;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.author-bio-name { font-family: var(--serif); font-weight: 700; font-size: 1rem; margin-bottom: 3px; }
.author-bio-title { font-size: 0.75rem; color: var(--muted); margin-bottom: 8px; font-family: var(--mono); }
.author-bio-text { font-size: 0.84rem; line-height: 1.6; margin-bottom: 8px; }
.author-bio-reviewer { font-size: 0.75rem; color: var(--muted); }
.reviewer-label { font-weight: 600; margin-right: 4px; }

/* Inline related */
.inline-related {
  margin: 2.5rem 0;
  padding: 1.4rem 1.6rem;
  background: var(--cream);
  border: 2px solid var(--rule);
  border-radius: 6px;
}
.inline-related-title {
  font-family: var(--mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  margin-bottom: 14px;
}
.inline-related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 8px;
}
.inline-related-item {
  display: flex;
  flex-direction: column;
  padding: 10px 12px;
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: 3px;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s;
}
.inline-related-item:hover { border-color: var(--ink); }
.inline-related-item-title { font-weight: 600; font-size: 0.84rem; color: var(--ink); margin-bottom: 3px; }
.inline-related-item-desc { font-size: 0.74rem; color: var(--muted); line-height: 1.4; }

/* ── SIDEBAR ──────────────────────────────────────────────────────────────── */
.sidebar { display: flex; flex-direction: column; gap: 28px; }
.sb-widget {
  border: 1px solid var(--rule);
  background: var(--white);
  border-radius: 4px;
  overflow: hidden;
}
.sb-head {
  background: var(--ink);
  color: var(--paper);
  padding: 12px 18px;
  font-family: var(--serif);
  font-size: 0.88rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}
.sb-body { padding: 14px 18px; }
.sb-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 0;
  border-bottom: 1px solid var(--cream);
  text-decoration: none;
  color: var(--ink);
  transition: color 0.15s;
  font-size: 0.84rem;
}
.sb-link:last-child { border-bottom: none; }
.sb-link:hover { color: var(--red); }
.sb-link-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}
.sb-num {
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--muted);
  margin-left: auto;
}
/* Formula sidebar */
.formula-sb {
  background: var(--ink);
  padding: 16px 18px;
  font-family: var(--mono);
  border-radius: 4px;
}
.formula-sb-title {
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #555f70;
  margin-bottom: 12px;
}
.formula-sb-item {
  padding: 8px 0;
  border-bottom: 1px solid #1e2535;
  font-size: 0.82rem;
  color: #e2e8f0;
  line-height: 1.5;
}
.formula-sb-item:last-child { border-bottom: none; }
.formula-sb-label { font-size: 0.62rem; color: #4a5568; margin-bottom: 3px; }
.formula-sb-val { color: #63b3ed; }
/* Series tracker */
.series-track { display: flex; flex-direction: column; gap: 6px; padding: 14px 18px; }
.st-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.82rem;
  text-decoration: none;
  color: var(--ink);
  padding: 6px 8px;
  border-radius: 3px;
  transition: background 0.15s;
}
.st-item:hover { background: var(--cream); }
.st-dot {
  width: 24px; height: 24px;
  border-radius: 50%;
  font-family: var(--mono);
  font-size: 0.62rem;
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}

/* ── FEATURED ARTICLES GRID ──────────────────────────────────────────────── */
.articles-section {
  background: var(--ink);
  padding: 64px 40px;
  border-top: 3px solid var(--rule);
}
.articles-inner { max-width: 1200px; margin: 0 auto; }
.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 36px;
  padding-bottom: 16px;
  border-bottom: 1px solid #2a2a2a;
}
.section-title {
  font-family: var(--serif);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--paper);
}
.section-link {
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--red);
  text-decoration: none;
}
.section-link:hover { text-decoration: underline; }

/* Topic silos */
.silos-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 48px;
}
.silo-card {
  background: #111720;
  border: 1px solid #1e2535;
  border-radius: 4px;
  padding: 20px;
  text-decoration: none;
  transition: border-color 0.15s, background 0.15s;
  display: block;
}
.silo-card:hover { background: #161f2e; border-color: #3a4a60; }
.silo-emoji { font-size: 1.4rem; display: block; margin-bottom: 10px; }
.silo-name {
  font-family: var(--serif);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--paper);
  margin-bottom: 4px;
}
.silo-count { font-family: var(--mono); font-size: 0.65rem; color: #4a5568; }

/* Article cards grid */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.article-card-hp {
  background: #111720;
  border: 1px solid #1e2535;
  border-radius: 4px;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  transition: border-color 0.15s;
  overflow: hidden;
}
.article-card-hp:hover { border-color: #3a4a60; }
.acard-thumb {
  height: 110px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--serif);
  font-size: 2.8rem;
  font-weight: 900;
  color: rgba(255,255,255,0.08);
  border-bottom: 1px solid #1e2535;
  position: relative;
  overflow: hidden;
}
.acard-symbol {
  position: absolute;
  font-size: 4rem;
  font-family: var(--serif);
  font-weight: 900;
  opacity: 0.12;
  right: 16px;
  bottom: -6px;
}
.acard-tag {
  position: absolute;
  bottom: 10px;
  left: 12px;
  font-family: var(--mono);
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 3px 8px;
  border-radius: 2px;
  color: #fff;
}
.acard-body { padding: 16px 18px 18px; flex: 1; display: flex; flex-direction: column; }
.acard-title {
  font-family: var(--serif);
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--paper);
  line-height: 1.35;
  margin-bottom: 8px;
  flex: 1;
}
.acard-meta { font-family: var(--mono); font-size: 0.62rem; color: #4a5568; margin-top: auto; }

/* ── TOOLS ROW ────────────────────────────────────────────────────────────── */
.tools-section {
  background: var(--paper);
  padding: 56px 40px;
  border-top: 2px solid var(--rule);
}
.tools-inner { max-width: 1200px; margin: 0 auto; }
.tools-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 32px;
}
.tool-card {
  border: 2px solid var(--rule);
  border-radius: 4px;
  padding: 22px 24px;
  text-decoration: none;
  background: #fff;
  display: flex;
  gap: 16px;
  align-items: flex-start;
  transition: border-color 0.15s;
}
.tool-card:hover { border-color: var(--ink); }
.tool-icon {
  width: 44px; height: 44px;
  background: var(--ink);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 0.9rem;
  color: var(--red);
  flex-shrink: 0;
}
.tool-name { font-family: var(--serif); font-weight: 700; font-size: 0.95rem; margin-bottom: 4px; color: var(--ink); }
.tool-desc { font-size: 0.78rem; color: var(--muted); line-height: 1.4; }
.tool-badge {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background: #d4edda;
  color: #155724;
  padding: 2px 6px;
  border-radius: 2px;
  margin-top: 6px;
}

/* ── CTA STRIP ───────────────────────────────────────────────────────────── */
.cta-strip {
  background: var(--red);
  padding: 48px 40px;
  text-align: center;
}
.cta-strip-title {
  font-family: var(--serif);
  font-size: 2rem;
  font-weight: 900;
  color: #fff;
  margin-bottom: 12px;
}
.cta-strip-sub { color: rgba(255,255,255,0.8); margin-bottom: 24px; font-size: 1rem; }
.cta-strip-btn {
  display: inline-block;
  background: #fff;
  color: var(--red);
  font-family: var(--mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 13px 32px;
  border-radius: 2px;
  text-decoration: none;
  font-weight: 600;
  transition: background 0.15s;
}
.cta-strip-btn:hover { background: var(--cream); }

/* ── FOOTER ───────────────────────────────────────────────────────────────── */
footer {
  background: var(--ink);
  color: var(--paper);
  border-top: 3px solid var(--red);
  padding: 48px 40px 32px;
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 240px 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid #2a2a2a;
  margin-bottom: 28px;
}
.footer-logo-area .footer-logo {
  font-family: var(--serif);
  font-weight: 900;
  font-size: 1.2rem;
  color: var(--paper);
  text-decoration: none;
}
.footer-logo span { color: var(--red); }
.footer-tagline { font-size: 0.8rem; color: #5a6070; margin-top: 8px; line-height: 1.5; }
.footer-col-title {
  font-family: var(--mono);
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: #5a6070;
  margin-bottom: 14px;
}
.footer-links { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.footer-links a { font-size: 0.82rem; color: #a09890; text-decoration: none; transition: color 0.15s; }
.footer-links a:hover { color: var(--paper); }
.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--mono);
  font-size: 0.65rem;
  color: #3a4050;
}

/* ── RESPONSIVE ──────────────────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .masthead-inner { grid-template-columns: 1fr; }
  .masthead-visual { display: none; }
  .page-body { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .silos-grid { grid-template-columns: repeat(2, 1fr); }
  .articles-grid { grid-template-columns: repeat(2, 1fr); }
  .tools-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 680px) {
  .site-nav { padding: 0 20px; }
  .masthead { padding: 40px 20px 0; }
  .page-body { padding: 32px 20px 60px; }
  .articles-section, .tools-section { padding: 40px 20px; }
  .silos-grid, .articles-grid, .tools-grid { grid-template-columns: 1fr 1fr; }
  footer { padding: 40px 20px 24px; }
  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
  .article-nav { grid-template-columns: 1fr; }
}

/* ── FEATURED ARTICLE CARD ──────────────────────────────────────────────── */
.featured-article-card {
  border: 2px solid var(--rule);
  border-radius: 6px;
  padding: 32px 36px;
  background: #fff;
  margin-bottom: 44px;
  position: relative;
}
.fac-eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}
.fac-tag {
  font-family: var(--mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  background: #fdf0ed;
  color: var(--red);
  padding: 4px 10px;
  border-radius: 2px;
}
.fac-new {
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--muted);
}
.fac-title {
  font-family: var(--serif);
  font-size: 1.7rem;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: 14px;
}
.fac-deck {
  font-size: 1rem;
  line-height: 1.65;
  color: #3d3830;
  font-weight: 300;
  margin-bottom: 16px;
  max-width: 600px;
}
.fac-meta {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
  margin-bottom: 24px;
}
.fac-dot { color: var(--rule); }
.fac-preview {
  background: var(--ink);
  border-radius: 4px;
  padding: 20px 24px;
  margin-bottom: 24px;
}
.fac-formula-row {
  display: flex;
  gap: 20px;
  align-items: center;
}
.fac-formula-item { flex: 1; }
.fac-formula-label {
  font-family: var(--mono);
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #4a5568;
  margin-bottom: 6px;
}
.fac-formula-val {
  font-family: var(--mono);
  font-size: 0.92rem;
  color: #63b3ed;
  line-height: 1.6;
}
.fac-formula-sub {
  font-size: 0.68rem;
  color: #4a5568;
  margin-top: 4px;
}
.fac-formula-sep {
  font-size: 1.4rem;
  color: #2a3040;
  flex-shrink: 0;
}
.fac-cta {
  display: inline-block;
  background: var(--red);
  color: #fff;
  font-family: var(--mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 12px 28px;
  border-radius: 2px;
  text-decoration: none;
  transition: background 0.15s;
}
.fac-cta:hover { background: #a83a20; }

/* ── EDITORIAL INTRO ─────────────────────────────────────────────────────── */
.editorial-intro {
  margin-bottom: 44px;
  padding-bottom: 44px;
  border-bottom: 2px solid var(--rule);
}
.ei-title {
  font-family: var(--serif);
  font-size: 1.45rem;
  font-weight: 700;
  margin-bottom: 14px;
  letter-spacing: -0.01em;
}
.editorial-intro p {
  font-size: 0.97rem;
  line-height: 1.75;
  color: #2d2820;
  margin-bottom: 1rem;
}
.ei-principles {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 22px;
}
.ei-principle {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 14px 16px;
  background: var(--cream);
  border-radius: 4px;
  border-left: 3px solid var(--red);
}
.ei-principle-icon {
  font-family: var(--serif);
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--red);
  width: 36px;
  flex-shrink: 0;
  line-height: 1;
  padding-top: 2px;
}
.ei-principle-title {
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 3px;
}
.ei-principle-desc {
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.5;
}

/* ── LEARNING PATH ───────────────────────────────────────────────────────── */
.learning-path { margin-bottom: 20px; }
.lp-title {
  font-family: var(--serif);
  font-size: 1.45rem;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}
.lp-sub {
  font-size: 0.88rem;
  color: var(--muted);
  margin-bottom: 22px;
}
.lp-steps { display: flex; flex-direction: column; gap: 10px; }
.lp-step {
  display: flex;
  gap: 16px;
  align-items: center;
  padding: 16px 18px;
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: #fff;
  text-decoration: none;
  color: var(--ink);
  transition: border-color 0.15s, background 0.15s;
}
.lp-step:hover { border-color: var(--ink); background: var(--cream); }
.lp-step-num {
  width: 38px; height: 38px;
  border-radius: 50%;
  color: #fff;
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.lp-step-body { flex: 1; }
.lp-step-series {
  font-family: var(--mono);
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 2px;
}
.lp-step-title {
  font-weight: 700;
  font-size: 0.9rem;
  line-height: 1.3;
  margin-bottom: 2px;
}
.lp-step-desc { font-size: 0.78rem; color: var(--muted); line-height: 1.4; }
.lp-step-arrow { font-size: 1.1rem; color: var(--rule); flex-shrink: 0; }
.lp-step:hover .lp-step-arrow { color: var(--ink); }


/* ── CONCEPT LINK PILLS ─────────────────────────────────────────────────── */
.cc-links-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 1.2rem 0 1.8rem;
  padding: 14px 16px;
  background: var(--cream);
  border-radius: 4px;
}
.cc-link-pill {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink);
  text-decoration: none;
  background: #fff;
  border: 1px solid var(--rule);
  padding: 5px 12px;
  border-radius: 20px;
  transition: border-color 0.15s, color 0.15s;
  white-space: nowrap;
}
.cc-link-pill:hover { border-color: var(--red); color: var(--red); }

/* ── RULES GRID ──────────────────────────────────────────────────────────── */
.rules-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 1.5rem 0;
}
.rule-card {
  background: var(--ink);
  border-radius: 4px;
  padding: 14px 16px;
}
.rule-name {
  font-family: var(--mono);
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #4a5568;
  margin-bottom: 7px;
}
.rule-formula {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: #63b3ed;
  margin-bottom: 6px;
  line-height: 1.4;
}
.rule-ex {
  font-size: 0.72rem;
  color: #7a8090;
  line-height: 1.4;
}
@media (max-width: 680px) {
  .rules-grid { grid-template-columns: 1fr 1fr; }
  .fac-formula-row { flex-direction: column; }
  .fac-formula-sep { display: none; }
}



/* ============ ARTICLE PAGE STYLES ============ */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
.nav-back{background:rgba(255,255,255,0.08);color:#b0a898!important;padding:6px 14px;font-size:0.75rem!important;}
.article-hero{background:var(--ink);color:var(--paper);padding:64px 48px 48px;position:relative;overflow:hidden;}
.hero-inner{max-width:800px;margin:0 auto;position:relative;z-index:2;}
.hero-breadcrumb{display:flex;align-items:center;gap:8px;font-family:var(--mono);font-size:0.68rem;letter-spacing:0.14em;text-transform:uppercase;color:#5a6070;margin-bottom:16px;}
.hero-breadcrumb a{color:#f87171;text-decoration:none;}
.hero-breadcrumb span{color:#2a3040;}
.article-tag-pill{display:inline-flex;background:rgba(220,38,38,0.2);border:1px solid rgba(220,38,38,0.4);color:#f87171;font-family:var(--mono);font-size:0.68rem;letter-spacing:0.12em;text-transform:uppercase;padding:4px 12px;margin-bottom:18px;}
.article-hero h1{font-family:var(--serif);font-size:clamp(1.8rem,4vw,2.8rem);font-weight:900;line-height:1.1;letter-spacing:-1px;margin-bottom:18px;}
.article-layout{max-width:1100px;margin:0 auto;padding:56px 48px;display:grid;grid-template-columns:1fr 272px;gap:64px;align-items:start;}
.article-body p:first-of-type::first-letter{font-family:var(--serif);font-size:4rem;font-weight:900;float:left;line-height:0.75;padding-right:10px;padding-top:8px;color:var(--accent);}
.article-body ul,.article-body ol{margin:0 0 22px;padding-left:0;list-style:none;}
.article-body ul li::before{content:'→';position:absolute;left:0;color:var(--accent);font-size:0.85rem;top:6px;}
.formula-block{background:var(--ink);color:var(--paper);padding:20px 26px;margin:28px 0;border-left:4px solid var(--accent);font-family:var(--mono);font-size:0.88rem;line-height:2.0;}
.formula-section-title{font-family:var(--mono);font-size:0.62rem;letter-spacing:0.14em;text-transform:uppercase;color:var(--accent);margin-bottom:10px;}
.faq-item.open .faq-a{display:block;}
.faq-item.open .faq-icon{transform:rotate(180deg);color:var(--accent);}
.a-tag:hover{background:var(--accent);color:white;}
.article-nav-card:hover .anc-title{color:var(--paper);}
.sb-title{font-family:var(--serif);font-size:0.92rem;font-weight:700;margin-bottom:12px;padding-bottom:9px;border-bottom:3px solid var(--accent);}
.sb-related-item{display:flex;gap:9px;padding:9px 0;border-bottom:1px solid var(--rule);text-decoration:none;}
.sb-related-item:last-child{border-bottom:none;}
.sb-related-item:hover .sb-rel-title{color:var(--accent);}
.sb-rel-num{font-family:var(--mono);font-size:0.7rem;color:white;background:var(--accent);width:26px;height:26px;display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:2px;}
.sb-rel-title{font-family:var(--serif);font-size:0.82rem;font-weight:700;color:var(--ink);transition:color .2s;line-height:1.3;margin-bottom:1px;}
.sb-rel-sub{font-size:0.68rem;color:var(--muted);}
.completion-badge{background:linear-gradient(135deg,var(--ink) 0%,#1a0505 100%);border:1px solid var(--accent);padding:20px;text-align:center;}
.badge-icon{font-size:2rem;margin-bottom:8px;}
.badge-title{font-family:var(--serif);font-size:0.95rem;font-weight:900;color:var(--paper);margin-bottom:6px;}
.badge-text{font-size:0.75rem;color:#9ca3af;line-height:1.4;}
.newsletter-sb{background:var(--accent);color:white;padding:20px;}
.newsletter-sb .sb-title{color:white;border-bottom-color:rgba(255,255,255,0.3);}
.newsletter-sb p{font-size:0.8rem;color:#fecaca;margin-bottom:12px;line-height:1.5;}
.nl-input{width:100%;padding:8px 11px;background:rgba(255,255,255,0.15);border:1px solid rgba(255,255,255,0.25);color:white;font-family:var(--sans);font-size:0.81rem;margin-bottom:7px;outline:none;}
.nl-btn{width:100%;padding:8px;background:white;color:var(--accent);border:none;font-family:var(--sans);font-size:0.8rem;font-weight:700;cursor:pointer;text-transform:uppercase;}
.footer-copy{font-family:var(--mono);font-size:0.66rem;color:#5a6070;}
.article-hero,.site-nav,footer{padding-left:20px;padding-right:20px;}
<style>
.author-bio-block{display:flex;gap:1.2rem;background:var(--cream);border:2px solid var(--rule);border-radius:6px;padding:1.4rem;margin:2.5rem 0 1.5rem;}
<style>
.references-block{margin:2rem 0;padding:1.2rem 1.5rem;border-left:3px solid var(--rule);background:var(--cream);}
.references-list li::before{content:"[";color:var(--muted);margin-right:.15rem;}
.references-list li::after{content:"]";color:var(--muted);}
.callout p::first-letter{all:unset;}
.formula::before{content:'FORMULA';position:absolute;top:7px;right:12px;font-family:var(--mono);font-size:0.56rem;letter-spacing:0.2em;color:var(--accent);opacity:0.8;}
.example-body p::first-letter{all:unset;}
<style>
.inline-related{margin:2.5rem 0;padding:1.4rem 1.6rem;background:var(--cream,#ede9e1);border:2px solid var(--rule,#d4cfc6);border-radius:6px;}
.tool-hero{background:var(--ink);padding:56px 48px 40px;}
.tool-hero-inner{max-width:900px;margin:0 auto;}
.tool-breadcrumb{font-family:var(--mono);font-size:0.68rem;letter-spacing:0.14em;text-transform:uppercase;color:#5a6070;margin-bottom:16px;}
.tool-breadcrumb a{color:#374151;text-decoration:none;opacity:.8;}
.tool-tag{display:inline-flex;background:rgba(55,65,81,0.3);border:1px solid rgba(55,65,81,0.5);color:#9ca3af;font-family:var(--mono);font-size:0.68rem;letter-spacing:0.12em;text-transform:uppercase;padding:4px 12px;margin-bottom:16px;}
.tool-hero h1{font-family:var(--serif);font-size:clamp(1.8rem,4vw,2.8rem);font-weight:900;line-height:1.1;color:white;margin-bottom:10px;}
.tool-hero p{font-family:var(--serif);font-style:italic;font-size:1.05rem;color:#6b7280;max-width:600px;}
.tool-layout{max-width:1100px;margin:0 auto;padding:48px 48px;display:grid;grid-template-columns:1fr 280px;gap:56px;align-items:start;}
.calculator-widget{background:white;border:2px solid var(--ink);overflow:hidden;}
.calc-head{background:var(--ink);padding:16px 24px;display:flex;align-items:center;gap:12px;}
.calc-head-title{font-family:var(--mono);font-size:0.75rem;letter-spacing:0.14em;text-transform:uppercase;color:white;}
.calc-head-badge{font-family:var(--mono);font-size:0.65rem;padding:2px 8px;background:#374151;color:white;}
.calc-body{padding:28px;}
.calc-label{font-family:var(--mono);font-size:0.68rem;letter-spacing:0.12em;text-transform:uppercase;color:var(--muted);margin-bottom:8px;}
.calc-input{width:100%;padding:14px 16px;border:2px solid var(--rule);font-family:var(--mono);font-size:1.1rem;background:var(--accent-light);color:var(--ink);outline:none;transition:border .2s;margin-bottom:4px;}
.calc-input:focus{border-color:#374151;}
.calc-hint{font-size:0.75rem;color:var(--muted);margin-bottom:20px;}
.calc-btn{width:100%;padding:14px;background:#374151;color:white;border:none;font-family:var(--sans);font-size:1rem;font-weight:700;cursor:pointer;letter-spacing:0.06em;text-transform:uppercase;transition:opacity .2s;}
.calc-btn:hover{opacity:.88;}
.calc-result{margin-top:24px;background:var(--ink);padding:20px 24px;display:none;}
.result-label{font-family:var(--mono);font-size:0.62rem;letter-spacing:0.14em;text-transform:uppercase;color:#374151;margin-bottom:8px;}
.result-value{font-family:var(--mono);font-size:1.3rem;color:white;line-height:1.6;}
.result-steps{margin-top:16px;border-top:1px solid #1e2535;padding-top:14px;}
.step:last-child{border-bottom:none;}
.step-num{color:#374151;margin-right:8px;}
.examples-section{margin-top:32px;}
.examples-title{font-family:var(--serif);font-size:1.1rem;font-weight:700;margin-bottom:14px;}
.examples-table{width:100%;border-collapse:collapse;font-size:0.88rem;}
.examples-table th{background:var(--cream);padding:9px 14px;text-align:left;font-family:var(--mono);font-size:0.65rem;letter-spacing:0.1em;text-transform:uppercase;color:var(--muted);border-bottom:2px solid var(--ink);}
.examples-table td{padding:10px 14px;border-bottom:1px solid var(--rule);}
.ex-input{font-family:var(--mono);font-size:0.85rem;color:var(--ink);}
.ex-output{font-family:var(--mono);font-size:0.85rem;color:#374151;font-weight:600;}
.try-btn{font-family:var(--mono);font-size:0.65rem;padding:3px 10px;background:var(--accent-light);border:1px solid #374151;color:#374151;cursor:pointer;transition:all .15s;}
.try-btn:hover{background:#374151;color:white;}
.info-section{margin-top:36px;}
.info-section h2{font-family:var(--serif);font-size:1.5rem;font-weight:900;margin-bottom:14px;}
.info-section p{font-size:0.97rem;line-height:1.78;color:#1e1a16;margin-bottom:18px;}
.info-section p:first-of-type::first-letter{all:unset;}
.back-links{background:var(--cream);border:1px solid var(--rule);padding:18px;}
.back-links-title{font-family:var(--serif);font-size:0.88rem;font-weight:700;margin-bottom:10px;}
.back-link{display:block;font-size:0.8rem;color:#374151;text-decoration:none;padding:4px 0;font-family:var(--sans);}
.back-link:hover{text-decoration:underline;}
.tool-hero,.site-nav,footer{padding-left:20px;padding-right:20px;}
<style>
.faq{margin:2.5rem 0;}
/* HEADER */
header{border-bottom:2px solid var(--ink);padding:0 40px;background:var(--paper);position:sticky;top:0;z-index:100;}
.header-inner{max-width:1200px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;height:64px;}
.logo{font-family:var(--serif);font-weight:900;font-size:1.35rem;letter-spacing:-0.5px;color:var(--ink);text-decoration:none;}
.logo span{color:var(--accent);}
nav a{font-size:0.85rem;font-weight:500;color:var(--muted);text-decoration:none;letter-spacing:0.04em;text-transform:uppercase;transition:color 0.2s;}
nav a:hover,nav a.active{color:var(--ink);}
nav a.active{border-bottom:2px solid var(--accent);padding-bottom:2px;}
/* HERO */
.blog-hero{background:var(--ink);color:var(--paper);padding:72px 40px 60px;position:relative;overflow:hidden;}
.blog-hero::before{content:'∫∂∑∞∇';position:absolute;right:60px;top:20px;font-family:var(--serif);font-size:9rem;opacity:0.06;letter-spacing:-10px;line-height:1;pointer-events:none;}
.blog-hero-inner{max-width:1200px;margin:0 auto;}
.blog-hero-label{font-family:var(--mono);font-size:0.75rem;letter-spacing:0.15em;color:var(--accent);text-transform:uppercase;margin-bottom:16px;}
.blog-hero h1{font-family:var(--serif);font-size:clamp(2.4rem,5vw,4rem);font-weight:900;line-height:1.08;margin-bottom:20px;max-width:640px;}
.blog-hero p{color:#a09890;max-width:500px;font-size:1.05rem;font-weight:300;}
/* FILTER BAR */
.filter-bar{border-bottom:1px solid var(--rule);padding:0 40px;background:var(--paper);position:sticky;top:64px;z-index:90;}
.filter-inner{max-width:1200px;margin:0 auto;display:flex;gap:0;overflow-x:auto;scrollbar-width:none;}
.filter-inner::-webkit-scrollbar{display:none;}
.filter-btn{font-family:var(--sans);font-size:0.82rem;font-weight:500;color:var(--muted);background:none;border:none;border-bottom:2px solid transparent;padding:14px 20px;cursor:pointer;white-space:nowrap;transition:all 0.2s;letter-spacing:0.02em;}
.filter-btn:hover{color:var(--ink);}
.filter-btn.active{color:var(--accent);border-bottom-color:var(--accent);font-weight:600;}
/* MAIN LAYOUT */
main{max-width:1200px;margin:0 auto;padding:56px 40px;display:grid;grid-template-columns:1fr 320px;gap:64px;align-items:start;}
/* FEATURED POST */
.featured-post{grid-column:1/-1;display:grid;grid-template-columns:1fr 1fr;gap:0;border:2px solid var(--ink);margin-bottom:24px;overflow:hidden;transition:transform 0.3s ease,box-shadow 0.3s ease;cursor:pointer;}
.featured-post:hover{transform:translateY(-4px);box-shadow:6px 6px 0 var(--ink);}
.featured-img{background:var(--ink);min-height:340px;display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden;}
.featured-img svg{width:100%;height:100%;position:absolute;inset:0;}
.featured-body{padding:40px;display:flex;flex-direction:column;justify-content:space-between;border-left:2px solid var(--ink);}
.featured-tag{display:inline-block;font-family:var(--mono);font-size:0.7rem;letter-spacing:0.12em;text-transform:uppercase;background:var(--accent);color:white;padding:3px 10px;margin-bottom:16px;width:fit-content;}
.featured-body h2{font-family:var(--serif);font-size:1.9rem;font-weight:900;line-height:1.15;margin-bottom:14px;color:var(--ink);}
.featured-body p{color:var(--muted);font-size:0.95rem;line-height:1.65;margin-bottom:24px;}
.post-meta{display:flex;align-items:center;gap:12px;}
.avatar{width:32px;height:32px;border-radius:50%;background:var(--cream);border:2px solid var(--ink);display:flex;align-items:center;justify-content:center;font-family:var(--serif);font-size:0.75rem;font-weight:700;}
.meta-text{font-size:0.8rem;color:var(--muted);}
.meta-text strong{color:var(--ink);font-weight:600;}
.read-time{margin-left:auto;font-family:var(--mono);font-size:0.72rem;color:var(--muted);background:var(--cream);padding:3px 10px;border-radius:2px;}
/* ARTICLES FEED */
.articles-feed{display:flex;flex-direction:column;gap:0;}
/* SILO GROUP */
.silo-group{margin-bottom:8px;}
.silo-group[style*="none"]{display:none;}
.silo-header-bar{
  display:flex;align-items:center;gap:10px;
  padding:16px 0 12px;
  border-top:2px solid var(--ink);
  border-bottom:1px solid var(--rule);
  cursor:pointer;user-select:none;
}
.silo-header-bar:hover .silo-title-text{color:var(--accent);}
.silo-title-text{font-family:var(--serif);font-size:1.05rem;font-weight:900;letter-spacing:-0.3px;transition:color 0.2s;}
.silo-pill{font-family:var(--mono);font-size:0.62rem;background:var(--cream);color:var(--muted);padding:2px 8px;border:1px solid var(--rule);white-space:nowrap;}
.silo-url-text{font-family:var(--mono);font-size:0.62rem;color:var(--muted);margin-left:auto;}
.silo-toggle-icon{font-size:0.7rem;color:var(--muted);margin-left:6px;transition:transform 0.25s;}
.silo-toggle-icon.open{transform:rotate(180deg);}
.silo-body{overflow:hidden;transition:max-height 0.35s ease;}
.silo-body.collapsed{max-height:0;}
/* ARTICLE CARD */
.article-card{display:grid;grid-template-columns:100px 1fr;text-decoration:none;color:inherit;gap:20px;padding:16px 0;border-bottom:1px solid var(--rule);cursor:pointer;transition:all 0.2s;}
.article-card:hover .article-title{color:var(--accent);}
.article-thumb{width:100px;height:68px;border:1px solid var(--rule);transition:transform 0.2s;flex-shrink:0;overflow:hidden;display:flex;align-items:center;justify-content:center;}
.article-card:hover .article-thumb{transform:scale(1.04);}
.article-info{display:flex;flex-direction:column;justify-content:center;gap:5px;}
.article-title{font-family:var(--serif);font-size:0.97rem;font-weight:700;line-height:1.3;color:var(--ink);transition:color 0.2s;}
.article-meta{font-size:0.74rem;color:var(--muted);display:flex;gap:8px;flex-wrap:wrap;}
/* Tool card variant */
.article-card.tool-card .article-tag{color:#7c3aed;}
.article-card.tool-card .article-thumb{background:var(--ink);}
/* SIDEBAR */
.sidebar{display:flex;flex-direction:column;gap:36px;}
.sidebar-widget{border:1px solid var(--rule);padding:24px;background:white;}
.widget-title{font-family:var(--serif);font-size:1rem;font-weight:700;margin-bottom:16px;padding-bottom:12px;border-bottom:2px solid var(--ink);}
.related-list{display:flex;flex-direction:column;gap:0;}
.related-item{display:flex;gap:12px;padding:11px 0;border-bottom:1px solid var(--rule);cursor:pointer;transition:all 0.15s;}
.related-item:last-child{border-bottom:none;}
.related-item:hover .related-title{color:var(--accent);}
.related-num{font-family:var(--mono);font-size:0.78rem;color:var(--muted);border:1px solid var(--rule);display:flex;align-items:center;justify-content:center;width:34px;height:34px;flex-shrink:0;margin-top:2px;}
.related-title{font-family:var(--serif);font-size:0.86rem;font-weight:700;line-height:1.3;color:var(--ink);transition:color 0.2s;margin-bottom:2px;}
.related-sub{font-size:0.7rem;color:var(--muted);}
.topics-grid{display:flex;flex-wrap:wrap;gap:7px;}
.topic-chip{font-size:0.73rem;font-family:var(--mono);padding:5px 11px;border:1px solid var(--rule);background:var(--paper);cursor:pointer;letter-spacing:0.04em;transition:all 0.15s;color:var(--ink);}
.topic-chip:hover{background:var(--ink);color:var(--paper);border-color:var(--ink);}
/* Silo index widget */
.silo-index-list{display:flex;flex-direction:column;gap:0;}
.silo-index-item{display:flex;align-items:center;gap:10px;padding:9px 0;border-bottom:1px solid var(--rule);cursor:pointer;text-decoration:none;}
.silo-index-item:last-child{border-bottom:none;}
.silo-index-item:hover .silo-idx-name{color:var(--accent);}
.silo-idx-dot{width:8px;height:8px;border-radius:50%;flex-shrink:0;}
.silo-idx-name{font-family:var(--serif);font-size:0.86rem;font-weight:700;color:var(--ink);transition:color 0.2s;flex:1;}
.silo-idx-count{font-family:var(--mono);font-size:0.62rem;color:var(--muted);}
.formula-box{background:var(--cream);border-left:3px solid var(--accent);padding:14px 16px;margin-bottom:12px;}
.formula-label{font-family:var(--mono);font-size:0.65rem;color:var(--accent);letter-spacing:0.1em;text-transform:uppercase;margin-bottom:6px;}
.formula-text{font-family:var(--mono);font-size:1.05rem;color:var(--ink);letter-spacing:0.05em;}
.formula-desc{font-size:0.8rem;color:var(--muted);margin-top:8px;line-height:1.5;}
.newsletter-widget{background:var(--ink);color:var(--paper);padding:24px;}
.newsletter-widget .widget-title{color:var(--paper);border-bottom-color:var(--accent);}
.newsletter-widget p{font-size:0.85rem;color:#a09890;margin-bottom:16px;line-height:1.5;}
.newsletter-input{width:100%;padding:10px 14px;background:rgba(255,255,255,0.08);border:1px solid rgba(255,255,255,0.15);color:var(--paper);font-family:var(--sans);font-size:0.85rem;margin-bottom:10px;outline:none;}
.newsletter-input::placeholder{color:#6b6560;}
.newsletter-btn{width:100%;padding:10px;background:var(--accent);color:white;border:none;font-family:var(--sans);font-size:0.85rem;font-weight:600;cursor:pointer;letter-spacing:0.05em;text-transform:uppercase;transition:background 0.2s;}
.newsletter-btn:hover{background:#a83a22;}
/* FOOTER */
footer{border-top:2px solid var(--ink);padding:40px;}
.featured-post{animation:fadeUp 0.5s ease both 0.1s;opacity:0;}
.silo-group:nth-child(1){animation:fadeUp 0.4s ease both 0.15s;opacity:0;}
.silo-group:nth-child(2){animation:fadeUp 0.4s ease both 0.2s;opacity:0;}
.silo-group:nth-child(3){animation:fadeUp 0.4s ease both 0.25s;opacity:0;}
.silo-group:nth-child(4){animation:fadeUp 0.4s ease both 0.3s;opacity:0;}
.silo-group:nth-child(5){animation:fadeUp 0.4s ease both 0.35s;opacity:0;}
.silo-group:nth-child(6){animation:fadeUp 0.4s ease both 0.4s;opacity:0;}
.silo-group:nth-child(7){animation:fadeUp 0.4s ease both 0.45s;opacity:0;}
.silo-group:nth-child(8){animation:fadeUp 0.4s ease both 0.5s;opacity:0;}
header,footer{padding-left:20px;padding-right:20px;}
.blog-hero,.filter-bar{padding-left:20px;padding-right:20px;}
/* ── TOP BAR ── */
.topbar{
  background:var(--surface);border-bottom:1px solid var(--border);
  padding:0 40px;height:56px;
  display:flex;align-items:center;justify-content:space-between;
  position:sticky;top:0;z-index:200;
}
.topbar-logo{font-family:var(--serif);font-size:1.1rem;font-weight:800;letter-spacing:-0.5px;}
.topbar-logo em{color:var(--green);font-style:normal;}
.topbar-badge{
  font-family:var(--mono);font-size:0.65rem;letter-spacing:0.14em;
  background:var(--green);color:#051209;padding:4px 12px;font-weight:500;
}
.topbar-right{display:flex;gap:24px;align-items:center;}
.topbar-right a{font-size:0.78rem;color:var(--muted);text-decoration:none;transition:color .2s;}
.topbar-right a:hover{color:var(--text);}
/* ── HERO ── */
.plan-hero{
  padding:72px 40px 56px;
  border-bottom:1px solid var(--border);
  background: radial-gradient(ellipse 60% 60% at 70% 50%, #0d2918 0%, var(--bg) 70%);
  position:relative;overflow:hidden;
}
.plan-hero::after{
  content:'';position:absolute;inset:0;
  background:repeating-linear-gradient(0deg,transparent,transparent 39px,var(--border) 40px),
             repeating-linear-gradient(90deg,transparent,transparent 39px,var(--border) 40px);
  opacity:0.2;pointer-events:none;
}
.plan-hero-inner{max-width:1200px;margin:0 auto;position:relative;z-index:2;}
.hero-label{font-family:var(--mono);font-size:0.68rem;letter-spacing:0.2em;color:var(--green);text-transform:uppercase;margin-bottom:18px;}
.plan-hero h1{
  font-family:var(--serif);font-size:clamp(2.4rem,5vw,4.2rem);font-weight:800;
  line-height:1.05;letter-spacing:-1.5px;margin-bottom:18px;
}
.plan-hero h1 span{color:var(--green);}
.plan-hero p{color:var(--muted);font-size:1.05rem;max-width:560px;font-weight:300;margin-bottom:36px;}
.hero-kpis{display:flex;gap:32px;flex-wrap:wrap;}
.kpi{
  background:var(--surface);border:1px solid var(--border);
  padding:16px 24px;min-width:130px;
}
.kpi-num{font-family:var(--serif);font-size:1.8rem;font-weight:800;color:var(--green);line-height:1;}
.kpi-label{font-size:0.72rem;color:var(--muted);margin-top:4px;text-transform:uppercase;letter-spacing:0.06em;}
/* ── TABS ── */
.tabs-bar{
  background:var(--surface);border-bottom:1px solid var(--border);
  padding:0 40px;display:flex;gap:0;overflow-x:auto;scrollbar-width:none;
  position:sticky;top:56px;z-index:190;
}
.tabs-bar::-webkit-scrollbar{display:none;}
.tab-btn{
  font-family:var(--sans);font-size:0.8rem;font-weight:500;
  color:var(--muted);background:none;border:none;
  border-bottom:2px solid transparent;
  padding:14px 20px;cursor:pointer;white-space:nowrap;
  letter-spacing:0.03em;transition:all .2s;
}
.tab-btn:hover{color:var(--text);}
.tab-btn.active{color:var(--green);border-bottom-color:var(--green);}
/* ── CONTENT AREA ── */
.content-area{max-width:1200px;margin:0 auto;padding:48px 40px;}
.tab-panel{display:none;}
.tab-panel.active{display:block;}
/* ── SECTION HEADS ── */
.sec-head{margin-bottom:32px;}
.sec-title{font-family:var(--serif);font-size:1.6rem;font-weight:800;letter-spacing:-0.5px;margin-bottom:6px;}
.sec-sub{font-size:0.85rem;color:var(--muted);}
/* ── SILO GRID ── */
.silo-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:2px;}
.silo-header{display:flex;align-items:flex-start;justify-content:space-between;margin-bottom:16px;}
.silo-icon{
  width:40px;height:40px;display:flex;align-items:center;justify-content:center;
  font-family:var(--mono);font-size:0.75rem;font-weight:500;letter-spacing:-0.5px;
  flex-shrink:0;
}
.silo-url{font-family:var(--mono);font-size:0.68rem;color:var(--muted);margin-bottom:14px;}
.silo-articles{display:flex;flex-direction:column;gap:0;}
.silo-article{
  font-size:0.8rem;color:var(--muted);padding:6px 0;
  border-bottom:1px solid var(--border);display:flex;align-items:center;gap:8px;
  transition:color .15s;
}
.silo-article:last-child{border-bottom:none;}
.silo-card:hover .silo-article{color:#9db8a4;}
.silo-article::before{content:'›';color:var(--green);font-size:0.9rem;}
.silo-kw{
  margin-top:14px;padding-top:12px;border-top:1px solid var(--border);
  display:flex;flex-wrap:wrap;gap:6px;
}
.kw-chip{
  font-family:var(--mono);font-size:0.6rem;letter-spacing:0.06em;
  padding:3px 8px;background:rgba(34,197,94,0.08);color:var(--green);border:1px solid rgba(34,197,94,0.2);
}
/* Color per silo */
.silo-green .silo-icon{background:rgba(34,197,94,.12);color:var(--green);}
.silo-green{border-top:3px solid var(--green);}
.silo-teal .silo-icon{background:rgba(20,184,166,.12);color:var(--teal);}
.silo-teal:hover{border-top-color:var(--teal)!important;}
.silo-amber .silo-icon{background:rgba(245,158,11,.12);color:var(--amber);}
.silo-amber:hover{border-top-color:var(--amber)!important;}
.silo-red .silo-icon{background:rgba(239,68,68,.12);color:var(--red);}
.silo-red:hover{border-top-color:var(--red)!important;}
.silo-purple .silo-icon{background:rgba(168,85,247,.12);color:var(--purple);}
.silo-purple:hover{border-top-color:var(--purple)!important;}
.silo-orange .silo-icon{background:rgba(249,115,22,.12);color:var(--orange);}
.silo-orange:hover{border-top-color:var(--orange)!important;}
.silo-blue .silo-icon{background:rgba(59,130,246,.12);color:var(--blue);}
.silo-blue:hover{border-top-color:var(--blue)!important;}
.silo-gray .silo-icon{background:rgba(107,124,110,.15);color:var(--muted);}
.silo-gray:hover{border-top-color:var(--muted)!important;}
/* ── KEYWORD STRATEGY TABLE ── */
.kw-section{margin-bottom:40px;}
.kw-section-title{
  font-family:var(--mono);font-size:0.68rem;letter-spacing:0.14em;text-transform:uppercase;
  color:var(--green);padding:10px 16px;background:rgba(34,197,94,0.07);border-left:3px solid var(--green);
  margin-bottom:2px;
}
.kw-table{width:100%;border-collapse:collapse;}
.kw-table th{
  background:var(--surface);font-family:var(--mono);font-size:0.65rem;
  letter-spacing:0.1em;text-transform:uppercase;color:var(--muted);
  padding:10px 14px;text-align:left;border-bottom:1px solid var(--border);
}
.kw-table td{
  padding:10px 14px;border-bottom:1px solid var(--border);
  font-size:0.82rem;
}
.kw-table tr:hover td{background:var(--surface);}
.kw-table td:first-child{font-family:var(--mono);font-size:0.8rem;color:var(--text);}
.badge{
  display:inline-block;font-family:var(--mono);font-size:0.6rem;
  letter-spacing:0.08em;padding:2px 8px;border-radius:1px;font-weight:500;
}
.badge-high{background:rgba(34,197,94,.15);color:var(--green);}
.badge-med{background:rgba(245,158,11,.15);color:var(--amber);}
.badge-low{background:rgba(59,130,246,.15);color:var(--blue);}
.badge-tool{background:rgba(168,85,247,.15);color:var(--purple);}
.badge-info{background:rgba(20,184,166,.12);color:var(--teal);}
.vol-bar{display:flex;align-items:center;gap:8px;}
.vol-track{flex:1;height:4px;background:var(--border);border-radius:2px;max-width:80px;}
.vol-fill{height:100%;border-radius:2px;background:var(--green);}
/* ── CONTENT FORMAT ── */
.format-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-bottom:40px;}
.format-card{background:var(--surface);border:1px solid var(--border);padding:28px;}
.format-card-title{font-family:var(--serif);font-size:1rem;font-weight:700;margin-bottom:16px;padding-bottom:10px;border-bottom:1px solid var(--border);}
.format-steps{display:flex;flex-direction:column;gap:0;}
.format-step{
  display:flex;gap:14px;padding:10px 0;border-bottom:1px solid var(--border);align-items:flex-start;
}
.format-step:last-child{border-bottom:none;}
.step-text strong{color:var(--text);}
/* ── INTERNAL LINKING ── */
.linking-diagram{background:var(--surface);border:1px solid var(--border);padding:32px;margin-bottom:28px;}
.link-flow{display:flex;align-items:center;gap:0;overflow-x:auto;padding:8px 0;}
.link-node{
  background:var(--surface2);border:1px solid var(--border);
  padding:12px 18px;white-space:nowrap;flex-shrink:0;
}
.link-node-title{font-size:0.78rem;font-weight:600;margin-bottom:2px;}
.link-node-type{font-family:var(--mono);font-size:0.6rem;color:var(--muted);}
.link-arrow{color:var(--green);font-size:1.2rem;padding:0 8px;flex-shrink:0;}
.link-node.pillar{border-color:var(--green);border-top:2px solid var(--green);}
.link-node.cluster{border-color:var(--teal);border-top:2px solid var(--teal);}
.link-node.tool{border-color:var(--purple);border-top:2px solid var(--purple);}
/* ── MONETIZATION ── */
.mono-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:32px;}
.mono-card{
  background:var(--surface);border:1px solid var(--border);
  padding:24px;border-top:3px solid var(--green);
}
.mono-icon{font-size:1.6rem;margin-bottom:12px;}
.mono-title{font-family:var(--serif);font-size:1rem;font-weight:700;margin-bottom:8px;}
.mono-items{display:flex;flex-direction:column;gap:4px;}
.mono-item{font-size:0.8rem;color:var(--muted);display:flex;align-items:center;gap:6px;}
.mono-item::before{content:'✓';color:var(--green);font-size:0.7rem;}
.mono-est{font-family:var(--mono);font-size:0.75rem;color:var(--green);margin-top:12px;padding-top:10px;border-top:1px solid var(--border);}
/* ── PROGRAMMATIC SEO ── */
.prog-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:2px;margin-bottom:32px;}
.prog-card{
  background:var(--surface);border:1px solid var(--border);padding:20px;
  transition:background .2s;cursor:pointer;
}
.prog-card:hover{background:var(--surface2);}
.prog-formula{font-family:var(--mono);font-size:0.9rem;color:var(--green);margin-bottom:8px;}
.prog-example{font-size:0.75rem;color:var(--muted);line-height:1.5;}
.prog-count{font-family:var(--mono);font-size:0.65rem;color:var(--muted);margin-top:8px;padding-top:6px;border-top:1px solid var(--border);}
/* ── ROADMAP ── */
.roadmap{display:flex;flex-direction:column;gap:0;}
.phase{border-left:2px solid var(--border);padding-left:28px;padding-bottom:40px;position:relative;}
.phase:last-child{padding-bottom:0;}
.phase-dot{
  position:absolute;left:-9px;top:0;
  width:16px;height:16px;border-radius:50%;border:2px solid var(--bg);
}
.phase-label{font-family:var(--mono);font-size:0.68rem;letter-spacing:0.14em;text-transform:uppercase;margin-bottom:6px;}
.phase-title{font-family:var(--serif);font-size:1.2rem;font-weight:700;margin-bottom:12px;}
.phase-tasks{display:grid;grid-template-columns:1fr 1fr;gap:6px;}
.phase-task{
  font-size:0.8rem;color:var(--muted);
  padding:8px 12px;background:var(--surface);border:1px solid var(--border);
  display:flex;align-items:center;gap:8px;
}
.phase-task .check{color:var(--green);font-size:0.7rem;}
.phase-task .pending{color:var(--border);font-size:0.7rem;}
/* ── OVERVIEW METRICS ── */
.overview-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:2px;margin-bottom:40px;}
.metric-card{
  background:var(--surface);border:1px solid var(--border);
  padding:24px 20px;text-align:center;
}
.metric-val{font-family:var(--serif);font-size:2rem;font-weight:800;line-height:1;margin-bottom:4px;}
.metric-label{font-size:0.72rem;color:var(--muted);text-transform:uppercase;letter-spacing:0.06em;}
.metric-sub{font-family:var(--mono);font-size:0.65rem;color:var(--muted);margin-top:6px;}
.silo-card:nth-child(1){animation-delay:.05s;}
.silo-card:nth-child(2){animation-delay:.1s;}
.silo-card:nth-child(3){animation-delay:.15s;}
.silo-card:nth-child(4){animation-delay:.2s;}
.silo-card:nth-child(5){animation-delay:.25s;}
.silo-card:nth-child(6){animation-delay:.3s;}
.silo-card:nth-child(7){animation-delay:.35s;}
.silo-card:nth-child(8){animation-delay:.4s;}
.silo-grid{grid-template-columns:1fr;}
.mono-grid{grid-template-columns:1fr;}
.format-grid{grid-template-columns:1fr;}
.overview-grid{grid-template-columns:repeat(2,1fr);}
.content-area,.plan-hero,.topbar,.tabs-bar{padding-left:20px;padding-right:20px;}
.article-hero::before{content:'';position:absolute;inset:0;background:linear-gradient(135deg,#0d1117 55%,#1a1520);}
.article-hero::after{content:'✗';position:absolute;right:20px;bottom:-80px;font-family:var(--serif);font-size:28rem;font-weight:900;opacity:0.04;line-height:1;pointer-events:none;color:var(--accentR);}
.toc-list li a{font-size:0.8rem;color:#3b5998;text-decoration:none;display:flex;align-items:center;gap:8px;padding:4px 0;transition:color .2s;}
.toc-list li a::before{content:'';width:14px;height:1px;background:#93c5fd;flex-shrink:0;transition:all .2s;}
.toc-list li a:hover{color:var(--accent);}
.toc-list li a:hover::before{width:22px;background:var(--accent);}
.mistake-block{border:1px solid var(--rule);margin:32px 0;overflow:hidden;}
.mistake-num{background:var(--accentR);color:white;font-family:var(--mono);font-size:3rem;font-weight:900;padding:16px 24px;line-height:1;}
.mistake-header{display:flex;align-items:stretch;gap:0;}
.mistake-title-area{background:var(--cream);padding:16px 24px;flex:1;display:flex;align-items:center;}
.mistake-title{font-family:var(--serif);font-size:1.05rem;font-weight:700;color:var(--ink);}
.wrong-box{background:#fff1ee;border-left:4px solid var(--accentR);padding:16px 22px;margin:0;}
.wrong-label{font-family:var(--mono);font-size:0.6rem;letter-spacing:0.14em;text-transform:uppercase;color:var(--accentR);margin-bottom:6px;}
.wrong-content{font-family:var(--mono);font-size:0.9rem;color:#5a1a0a;line-height:1.7;}
.right-box{background:var(--green-light);border-left:4px solid var(--green);padding:16px 22px;}
.right-label{font-family:var(--mono);font-size:0.6rem;letter-spacing:0.14em;text-transform:uppercase;color:var(--green);margin-bottom:6px;}
.right-content{font-family:var(--mono);font-size:0.9rem;color:#14532d;line-height:1.7;}
.explanation{padding:16px 22px;font-size:0.9rem;line-height:1.68;color:var(--ink);background:white;border-top:1px solid var(--rule);}
.explanation::first-letter{all:unset;}
.checklist{background:var(--ink);color:var(--paper);padding:28px 32px;margin:36px 0;}
.checklist-title{font-family:var(--serif);font-size:1.2rem;font-weight:700;margin-bottom:18px;color:white;}
.check-item{display:flex;gap:12px;align-items:flex-start;padding:8px 0;border-bottom:1px solid #1e2535;font-family:var(--mono);font-size:0.82rem;color:#bfdbfe;line-height:1.5;}
.check-item:last-child{border-bottom:none;}
.check-mark{color:var(--green);flex-shrink:0;margin-top:2px;}
.article-nav-card:hover .anc-label{color:#5a6070;}
.series-complete{background:var(--green-light);border:1px solid #86efac;padding:16px;}
.series-complete-title{font-family:var(--serif);font-size:0.9rem;font-weight:700;color:var(--green);margin-bottom:6px;}
.series-complete-text{font-size:0.78rem;color:#14532d;line-height:1.5;}
.nl-input::placeholder{color:rgba(255,255,255,0.4);}
.disc-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:2px;margin:28px 0;}
.disc-card{background:var(--cream);padding:16px;border-top:3px solid var(--ink);}
.disc-title{font-family:var(--serif);font-size:0.9rem;font-weight:700;margin-bottom:6px;}
.disc-desc{font-size:0.78rem;color:var(--muted);line-height:1.5;}
.nl-btn:hover{background:#a83a22;}
.rule-block{border:2px solid var(--accent);margin:32px 0;overflow:hidden;}
.rule-head{background:var(--accent);color:white;padding:14px 22px;display:flex;align-items:center;justify-content:space-between;}
.rule-head-name{font-family:var(--serif);font-size:1.05rem;font-weight:700;}
.rule-head-formula{font-family:var(--mono);font-size:0.88rem;color:#fef3c7;}
.rule-body{padding:20px 24px;background:var(--accent-light);}
.rule-body p{font-size:0.93rem;line-height:1.68;color:#451a03;margin-bottom:10px;}
.rule-body p::first-letter{all:unset;}
.cheatsheet{background:var(--ink);padding:28px 32px;margin:32px 0;}
.cheatsheet-title{font-family:var(--serif);font-size:1rem;font-weight:700;color:var(--paper);margin-bottom:16px;padding-bottom:10px;border-bottom:1px solid #1e2535;}
.cs-row{display:grid;grid-template-columns:180px 1fr;gap:12px;padding:8px 0;border-bottom:1px solid #1e2535;font-family:var(--mono);font-size:0.85rem;}
.cs-row:last-child{border-bottom:none;}
.cs-name{color:#fbbf24;}
.cs-formula{color:#e8e0d4;}
.timeline{margin:36px 0;border-left:3px solid var(--ink);padding-left:28px;display:flex;flex-direction:column;gap:0;}
.timeline-item{padding-bottom:32px;position:relative;}
.timeline-item:last-child{padding-bottom:0;}
.timeline-dot{position:absolute;left:-36px;top:4px;width:16px;height:16px;border-radius:50%;border:3px solid var(--paper);box-shadow:0 0 0 2px var(--ink);}
.timeline-year{font-family:var(--mono);font-size:0.72rem;letter-spacing:0.12em;color:var(--accent);margin-bottom:4px;}
.timeline-title{font-family:var(--serif);font-size:1rem;font-weight:700;margin-bottom:6px;}
.timeline-desc{font-size:0.88rem;color:var(--muted);line-height:1.6;}
.compare-grid{display:grid;grid-template-columns:1fr 1fr;gap:2px;margin:32px 0;border:2px solid var(--ink);}
.compare-col{padding:24px;}
.compare-col:first-child{background:var(--ink);color:var(--paper);}
.compare-col:last-child{background:var(--cream);}
.compare-name{font-family:var(--serif);font-size:1.2rem;font-weight:900;margin-bottom:16px;padding-bottom:12px;border-bottom:1px solid rgba(255,255,255,0.1);}
.compare-col:last-child .compare-name{border-bottom-color:var(--rule);}
.compare-item{font-size:0.85rem;line-height:1.6;margin-bottom:8px;padding-left:14px;position:relative;}
.compare-item::before{content:'·';position:absolute;left:0;color:var(--accent);}
.callout-warn{background:#fff8e1;border-left-color:#f59e0b;}
.callout-warn .callout-label{color:#b45309;}
.callout-warn p{color:#4a3000;}
.formula-content .hi{color:var(--accentR);}
.formula-content .hi2{color:#7ab3e0;}
.technique-block{border:2px solid var(--accent);margin:36px 0;overflow:hidden;}
.technique-head{background:var(--accent);color:white;padding:14px 24px;display:flex;align-items:center;justify-content:space-between;}
.technique-num{font-family:var(--mono);font-size:2rem;font-weight:900;color:rgba(255,255,255,0.2);line-height:1;}
.technique-info{flex:1;margin-left:16px;}
.technique-name{font-family:var(--serif);font-size:1.1rem;font-weight:700;color:white;}
.technique-when{font-family:var(--mono);font-size:0.68rem;color:#bfdbfe;letter-spacing:0.08em;margin-top:2px;}
.technique-body{padding:24px 28px;background:white;}
.technique-body p{font-size:0.95rem;line-height:1.72;margin-bottom:14px;color:#1e1a16;}
.technique-body p::first-letter{all:unset;}
.decision-tree{background:var(--cream);border:1px solid var(--rule);padding:28px;margin:36px 0;}
.dt-title{font-family:var(--serif);font-size:1.1rem;font-weight:700;margin-bottom:20px;text-align:center;}
.dt-step{display:flex;gap:16px;align-items:flex-start;margin-bottom:12px;}
.dt-num{font-family:var(--mono);font-size:0.8rem;font-weight:700;background:var(--accent);color:white;width:24px;height:24px;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:2px;}
.dt-content{font-size:0.92rem;line-height:1.6;color:var(--ink);}
.dt-content strong{color:var(--accent);}
.dt-arrow{text-align:center;font-size:1.4rem;color:var(--accent);margin:4px 0 12px 40px;}
.techniques-sb{display:flex;flex-direction:column;gap:6px;}
.tech-item{background:var(--accent-light);border:1px solid #bfdbfe;padding:10px 12px;}
.tech-item-name{font-family:var(--serif);font-size:0.82rem;font-weight:700;color:var(--accent);margin-bottom:2px;}
.tech-item-when{font-size:0.72rem;color:#3b5998;}
.article-body ol li{counter-increment:ol;}
.article-body ol li::before{content:counter(ol);position:absolute;left:0;top:6px;font-family:var(--mono);font-size:0.7rem;font-weight:700;background:var(--accent);color:white;width:18px;height:18px;display:flex;align-items:center;justify-content:center;}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:2px;margin:32px 0;}
.type-card{padding:24px;background:var(--cream);border-top:4px solid var(--accent);}
.type-card:last-child{border-top-color:var(--accentR);}
.type-card h3{font-family:var(--serif);font-size:1rem;font-weight:700;margin-bottom:10px;color:var(--ink);}
.type-card p{font-size:0.88rem;line-height:1.6;color:var(--ink);margin-bottom:0;}
.type-card p::first-letter{all:unset;}
.hierarchy-table{width:100%;border-collapse:collapse;margin:28px 0;font-family:var(--mono);font-size:0.85rem;}
.hierarchy-table th{background:var(--ink);color:var(--paper);padding:10px 14px;text-align:left;font-size:0.7rem;letter-spacing:0.1em;text-transform:uppercase;}
.hierarchy-table td{padding:10px 14px;border-bottom:1px solid var(--rule);}
.hierarchy-table tr:nth-child(even) td{background:var(--cream);}
.hierarchy-table .hl{color:var(--accent);font-weight:700;}
.mistake-grid{display:grid;grid-template-columns:1fr 1fr;gap:2px;margin:32px 0;}
.mistake-col{padding:20px 24px;}
.mistake-col:first-child{background:#fff1ee;border-top:3px solid var(--accentR);}
.mistake-col:last-child{background:#f0fdf4;border-top:3px solid #16a34a;}
.mistake-col h4{font-family:var(--serif);font-size:0.95rem;font-weight:700;margin-bottom:10px;}
.mistake-col:first-child h4{color:var(--accentR);}
.mistake-col:last-child h4{color:#16a34a;}
.mistake-item{font-family:var(--mono);font-size:0.82rem;line-height:1.6;margin-bottom:6px;color:var(--ink);}
.conditions-sb{background:var(--cream);border:1px solid var(--rule);padding:16px;}
.cond-item{font-size:0.82rem;line-height:1.6;padding:6px 0;border-bottom:1px solid var(--rule);display:flex;gap:8px;align-items:flex-start;}
.cond-item:last-child{border-bottom:none;}
.cond-check{color:#16a34a;font-size:0.8rem;flex-shrink:0;margin-top:2px;}
.hero-breadcrumb a:hover{color:var(--paper);}
.callout-red{background:#fff1ee;border-left-color:var(--accentR);}
.callout-red .callout-label{color:var(--accentR);}
.callout-red p{color:#5a1a0a;}
.formula-sb-text{font-family:var(--mono);font-size:0.9rem;color:var(--paper);line-height:1.7;}
.fn-block{border:2px solid var(--ink);margin:32px 0;overflow:hidden;}
.fn-block-head{display:grid;grid-template-columns:1fr 1fr;background:var(--ink);color:var(--paper);}
.fn-block-head-info{padding:20px 24px;}
.fn-type{font-family:var(--mono);font-size:0.65rem;letter-spacing:0.14em;text-transform:uppercase;color:var(--accent);margin-bottom:6px;}
.fn-name-big{font-family:var(--serif);font-size:1.3rem;font-weight:900;margin-bottom:4px;}
.fn-formula-big{font-family:var(--mono);font-size:0.95rem;color:#7ab3e0;margin-bottom:8px;}
.fn-prop{font-size:0.8rem;color:#9e9585;line-height:1.5;}
.fn-block-head svg{display:block;}
.fn-block-body{padding:20px 24px;background:var(--cream);}
.fn-block-body p{margin:0;font-size:0.9rem;line-height:1.65;color:var(--ink);}
.fn-block-body p::first-letter{all:unset;}
.fn-block-tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px;}
.fn-tag{font-family:var(--mono);font-size:0.65rem;padding:3px 10px;border:1px solid var(--rule);color:var(--muted);}
.callout-blue .callout-label{color:var(--accent2);}
.function-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:2px;margin:32px 0;}
.fn-card{background:var(--cream);padding:20px;border-top:3px solid var(--ink);transition:all .2s;cursor:default;}
.fn-card:hover{background:var(--ink);color:var(--paper);}
.fn-card:hover .fn-formula{color:var(--accent);}
.fn-card:hover .fn-desc{color:#9e9585;}
.fn-name{font-family:var(--serif);font-size:0.95rem;font-weight:700;margin-bottom:6px;}
.fn-formula{font-family:var(--mono);font-size:0.85rem;color:var(--accent);margin-bottom:8px;}
.fn-desc{font-size:0.78rem;color:var(--muted);line-height:1.5;}
.notation-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:2px;margin:28px 0;}
.notation-card{background:var(--cream);padding:18px;border-top:3px solid var(--ink);}
.notation-card:hover{background:var(--ink);color:var(--paper);}
.notation-sym{font-family:var(--mono);font-size:1.4rem;color:var(--accent);margin-bottom:6px;}
.notation-card:hover .notation-sym{color:#fbbf24;}
.notation-name{font-family:var(--serif);font-size:0.85rem;font-weight:700;margin-bottom:4px;}
.notation-desc{font-size:0.75rem;color:var(--muted);line-height:1.4;}
.notation-card:hover .notation-desc{color:#9e9585;}
.article-nav,.notation-grid{grid-template-columns:1fr;}
/* NAV */
.site-nav{background:var(--ink);padding:0 48px;display:flex;align-items:center;justify-content:space-between;height:60px;position:sticky;top:0;z-index:200;border-bottom:3px solid var(--accent);}
.nav-back:hover{background:rgba(255,255,255,0.15)!important;color:var(--paper)!important;}
/* ARTICLE HERO */
.article-hero{background:var(--ink);color:var(--paper);padding:72px 48px 56px;position:relative;overflow:hidden;}
.share-btn{font-family:var(--mono);font-size:0.68rem;color:var(--paper);background:var(--accent);padding:4px 12px;border:none;cursor:pointer;letter-spacing:0.06em;text-transform:uppercase;}
/* LAYOUT */
.article-layout{max-width:1100px;margin:0 auto;padding:64px 48px;display:grid;grid-template-columns:1fr 280px;gap:72px;align-items:start;}
/* CALLOUT */
.callout{background:var(--cream);border-left:4px solid var(--accent);padding:20px 24px;margin:32px 0;}
/* FORMULA */
.formula{background:var(--ink);color:var(--paper);padding:24px 32px;margin:32px 0;position:relative;overflow:hidden;}
/* VIS */
.vis-block{border:2px solid var(--ink);margin:36px 0;overflow:hidden;}
/* PULL QUOTE */
.pull-quote{font-family:var(--serif);font-style:italic;font-size:1.45rem;line-height:1.45;color:var(--accent);border-top:2px solid var(--accent);border-bottom:2px solid var(--accent);padding:24px 0;margin:44px 0;text-align:center;}
/* EXAMPLE BOX */
.example{border:1px solid var(--rule);margin:28px 0;}
/* ARTICLE TAGS */
.article-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:48px;padding-top:28px;border-top:1px solid var(--rule);}
/* NEXT/PREV */
.article-nav{display:grid;grid-template-columns:1fr 1fr;gap:2px;margin-top:48px;}
.sb-desc{font-size:0.78rem;color:var(--muted);line-height:1.5;margin-top:8px;}

/* ============================================================
   WORDPRESS INTEGRATION LAYER
   Map WP structure to original HTML classes
   ============================================================ */

/* Screen reader / accessibility */
.screen-reader-text{clip:rect(1px,1px,1px,1px);position:absolute!important;height:1px;width:1px;overflow:hidden;}
.screen-reader-text:focus{clip:auto!important;display:block;height:auto;width:auto;position:static!important;background:var(--ink);color:var(--paper);padding:.75rem 1.5rem;font-size:.9rem;z-index:100000;}

/* WP nav_menu outputs ul>li>a — style to match original .nav-links a */
.nav-links ul{list-style:none;margin:0;padding:0;display:flex;gap:6px;align-items:center;}
.nav-links ul li a{font-family:var(--mono);font-size:.72rem;text-transform:uppercase;letter-spacing:.08em;color:#a09890;text-decoration:none;padding:6px 14px;border-radius:2px;transition:color .15s,background .15s;display:block;}
.nav-links ul li a:hover,.nav-links ul li.current-menu-item>a{color:var(--paper);}
.nav-links ul li.nav-cta>a,.nav-links ul li.menu-item-cta>a{background:var(--red);color:var(--paper)!important;padding:6px 16px;}
.nav-links ul li.nav-cta>a:hover,.nav-links ul li.menu-item-cta>a:hover{background:#a83a20;}

/* Mobile hamburger */
.menu-toggle{display:none;background:none;border:none;color:var(--paper);font-size:1.4rem;cursor:pointer;padding:.3rem .5rem;line-height:1;}

/* Reading progress bar */
.reading-progress-bar{position:fixed;top:0;left:0;right:0;height:3px;z-index:9999;display:none;}
.reading-progress-fill{height:100%;width:0%;background:var(--red);transition:width .1s linear;}

/* WP pagination */
.cc-pagination{display:flex;gap:6px;flex-wrap:wrap;margin:2rem 0;}
.cc-pagination .page-numbers{display:inline-flex;align-items:center;justify-content:center;min-width:36px;height:36px;padding:0 .65rem;border:1px solid var(--rule);border-radius:2px;font-size:.85rem;color:var(--ink);text-decoration:none;transition:background .15s;}
.cc-pagination .page-numbers:hover{background:var(--cream);}
.cc-pagination .page-numbers.current{background:var(--ink);color:var(--paper);border-color:var(--ink);}

/* WP comments */
.cc-comments{margin-top:3rem;padding-top:2rem;border-top:1px solid var(--rule);}
.cc-comments .comment-respond h2,.cc-comments #comments h2{font-family:var(--serif);font-size:1.2rem;margin-bottom:1rem;}
.cc-comments .comment-form input,.cc-comments .comment-form textarea{width:100%;padding:.6rem .85rem;border:1px solid var(--rule);font-family:var(--sans);font-size:.9rem;background:var(--paper);color:var(--ink);margin-bottom:.75rem;}
.cc-comments .comment-form .submit{background:var(--red);color:#fff;border:none;padding:.65rem 1.5rem;font-size:.85rem;font-weight:600;cursor:pointer;}
.cc-comments .comment-form .submit:hover{background:#a83a20;}

/* Archive/blog pages */
.cc-archive-header{background:var(--ink);padding:3rem 40px 2.5rem;border-bottom:3px solid var(--red);}
.cc-archive-header h1{font-family:var(--serif);font-size:clamp(1.8rem,4vw,2.8rem);font-weight:900;color:var(--paper);margin-bottom:.5rem;}
.cc-archive-header p{color:#a09890;font-size:.97rem;}
.cc-posts-area{max-width:1200px;margin:0 auto;padding:3rem 40px;}
.cc-filter-tabs{background:var(--cream);border-bottom:1px solid var(--rule);display:flex;overflow-x:auto;padding:0 40px;scrollbar-width:none;}
.cc-filter-tabs::-webkit-scrollbar{display:none;}
.cc-filter-tab{display:inline-block;padding:.85rem 1rem;font-family:var(--mono);font-size:.72rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);white-space:nowrap;text-decoration:none;border-bottom:2px solid transparent;transition:color .15s,border-color .15s;}
.cc-filter-tab:hover{color:var(--ink);text-decoration:none;}
.cc-filter-tab--active{color:var(--red);border-bottom-color:var(--red);}
.cc-archive-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.cc-post-list{display:flex;flex-direction:column;gap:1rem;}
.cc-post-list-item{display:grid;grid-template-columns:auto 1fr;gap:1rem;align-items:start;padding:1.25rem;border:1px solid var(--rule);border-radius:3px;background:#fff;transition:border-color .15s;}
.cc-post-list-item:hover{border-color:var(--ink);}
.cc-post-list-item__tag{font-family:var(--mono);font-size:.62rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:#fff;padding:3px 8px;border-radius:2px;align-self:start;white-space:nowrap;}
.cc-post-list-item__title{font-family:var(--serif);font-size:1rem;font-weight:700;color:var(--ink);display:block;text-decoration:none;margin-bottom:.35rem;line-height:1.3;}
.cc-post-list-item__title:hover{color:var(--red);}
.cc-post-list-item__excerpt{font-size:.85rem;color:var(--muted);margin-bottom:.4rem;}
.cc-post-list-item__meta{font-size:.7rem;font-family:var(--mono);color:var(--muted);display:flex;gap:.75rem;}

/* 404 page */
.cc-404{text-align:center;padding:6rem 1.5rem;max-width:540px;margin:0 auto;}
.cc-404__num{font-family:var(--serif);font-size:8rem;line-height:1;color:var(--rule);font-weight:900;}

/* Static page */
.cc-page-layout{max-width:780px;margin:0 auto;padding:3rem 40px;}
.cc-page-title{font-family:var(--serif);font-size:2rem;font-weight:900;border-bottom:2px solid var(--ink);padding-bottom:.75rem;margin-bottom:2rem;}

/* Footer WP nav */
.footer-nav-links{list-style:none;padding:0;display:flex;gap:12px;flex-wrap:wrap;}
.footer-nav-links li a{font-size:.7rem;color:#3a4050;text-decoration:none;font-family:var(--mono);}
.footer-nav-links li a:hover{color:var(--paper);}

/* Responsive additions */
@media(max-width:1024px){
  .cc-archive-grid{grid-template-columns:repeat(2,1fr);}
  .cc-posts-area{padding:2rem 24px;}
  .cc-filter-tabs{padding:0 24px;}
  .cc-archive-header{padding:2.5rem 24px 2rem;}
}
@media(max-width:680px){
  .menu-toggle{display:block;}
  .nav-links{display:none;}
  .nav-links.nav-open{display:block;position:fixed;top:58px;left:0;right:0;bottom:0;background:var(--ink);overflow-y:auto;padding:1.5rem 20px;z-index:99;}
  .nav-links.nav-open ul{flex-direction:column;gap:0;}
  .nav-links.nav-open ul li a{padding:.9rem 0;font-size:.9rem;border-bottom:1px solid #2a2a2a;border-radius:0;}
  .cc-archive-grid{grid-template-columns:1fr;}
  .cc-posts-area{padding:1.5rem 20px;}
  .cc-filter-tabs{padding:0 20px;}
  .cc-archive-header{padding:2rem 20px 1.5rem;}
  .cc-page-layout{padding:2rem 20px;}
}