/* GT BOGO Engine Blog — Magazine Editorial Design */
/* Fonts */
@import url('https://fonts.googleapis.com/css2?family=Lora:ital,wght@0,400;0,500;0,600;0,700;1,400;1,600&family=Outfit:wght@700;800;900&family=DM+Sans:ital,wght@0,300;0,400;0,500;0,600;1,400&display=swap');

:root {
  --bg:           #0c0c12;
  --surface:      #14141c;
  --surface2:     #1b1b26;
  --border:       rgba(255,255,255,0.07);
  --border-hi:    rgba(255,255,255,0.14);
  --text:         #e8e8f0;
  --text-soft:    #9090a8;
  --text-muted:   #555570;
  --red:          #E10000;
  --cat-guide:    #3b82f6;
  --cat-compare:  #f59e0b;
  --cat-industry: #a78bfa;
  --cat-strategy: #10b981;
  --font-serif:   'Lora', Georgia, 'Times New Roman', serif;
  --font-ui:      'Outfit', sans-serif;
  --font-body:    'DM Sans', system-ui, sans-serif;
}

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

body {
  background: var(--bg) !important;
  color: var(--text) !important;
  font-family: var(--font-body) !important;
  font-weight: 400;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

/* ── Reading progress bar ───────────────────────────────────── */
#reading-progress {
  position: fixed; top: 0; left: 0; height: 3px;
  background: var(--red); width: 0%;
  z-index: 9999; transition: width 0.1s linear;
  pointer-events: none;
}

/* ── Navigation ─────────────────────────────────────────────── */
nav {
  position: fixed !important; top: 0; left: 0; right: 0;
  z-index: 100; padding: 0 40px !important;
  height: 60px;
  display: flex !important; align-items: center; justify-content: space-between;
  background: rgba(12,12,18,0.92) !important;
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border) !important;
}

.nav-logo {
  font-family: var(--font-ui) !important; font-weight: 900;
  font-size: 17px; color: var(--text) !important;
  text-decoration: none; display: flex; align-items: center; gap: 10px;
}

.nav-links { display: flex; gap: 24px; align-items: center; }
.nav-links a {
  color: var(--text-soft) !important; text-decoration: none;
  font-size: 14px; font-weight: 500; letter-spacing: 0.01em;
  transition: color 0.15s;
}
.nav-links a:hover { color: var(--text) !important; }

.nav-cta {
  background: var(--red) !important; color: #fff !important;
  font-weight: 600; font-size: 13px; letter-spacing: 0.05em;
  text-transform: uppercase; text-decoration: none;
  padding: 9px 22px !important; border-radius: 4px;
  transition: opacity 0.15s;
}
.nav-cta:hover { opacity: 0.85; }

@media (max-width: 768px) {
  nav { padding: 0 20px !important; }
  .nav-links { display: none; }
}

/* ── Breadcrumb ──────────────────────────────────────────────── */
.breadcrumb {
  display: flex; align-items: center; gap: 8px;
  font-size: 13px; color: var(--text-muted);
  margin-bottom: 32px;
}
.breadcrumb a {
  color: var(--text-soft); text-decoration: none;
  transition: color 0.15s;
}
.breadcrumb a:hover { color: var(--text); }
.breadcrumb-sep { color: var(--text-muted); font-size: 11px; }
.breadcrumb-current { color: var(--text-muted); }

/* ── Category chips ──────────────────────────────────────────── */
.cat-chip {
  display: inline-flex; align-items: center;
  padding: 3px 10px; border-radius: 999px;
  font-size: 11px; font-weight: 700;
  letter-spacing: 0.08em; text-transform: uppercase;
  font-family: var(--font-ui);
}
.cat-guide    { background: rgba(59,130,246,0.12); color: #60a5fa; }
.cat-compare  { background: rgba(245,158,11,0.12); color: #fbbf24; }
.cat-industry { background: rgba(167,139,250,0.12); color: #c4b5fd; }
.cat-strategy { background: rgba(16,185,129,0.12); color: #34d399; }

/* ── Article page layout ─────────────────────────────────────── */
.article-outer {
  max-width: 1120px; margin: 0 auto;
  padding: 88px 24px 80px;
  display: grid;
  grid-template-columns: minmax(0,720px) 280px;
  gap: 64px;
  align-items: start;
}

@media (max-width: 1040px) {
  .article-outer {
    grid-template-columns: minmax(0,1fr);
    max-width: 780px;
  }
  .article-toc { display: none; }
}

/* ── Article content ─────────────────────────────────────────── */
.article-content { min-width: 0; }

.post-header-meta {
  display: flex; align-items: center; gap: 16px;
  margin-bottom: 20px; flex-wrap: wrap;
}
.post-header-meta .sep { color: var(--text-muted); font-size: 12px; }
.post-date, .post-read-time {
  font-size: 13px; color: var(--text-soft);
  display: flex; align-items: center; gap: 5px;
}
.post-date-icon, .post-time-icon {
  width: 14px; height: 14px; opacity: 0.6;
}

.article-content h1 {
  font-family: var(--font-serif) !important;
  font-weight: 700 !important;
  font-size: clamp(28px, 4vw, 44px) !important;
  letter-spacing: -0.02em !important;
  line-height: 1.18 !important;
  color: var(--text) !important;
  margin-bottom: 32px !important;
}
.article-content h1 em { font-style: normal; color: var(--red); }

.article-content h2 {
  font-family: var(--font-ui) !important;
  font-weight: 800 !important; font-size: 22px !important;
  letter-spacing: -0.01em !important;
  color: var(--text) !important;
  margin: 52px 0 16px !important;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}
.article-content h2:first-of-type { border-top: none; margin-top: 40px !important; }

.article-content h3 {
  font-family: var(--font-ui) !important;
  font-weight: 700 !important; font-size: 18px !important;
  color: var(--text) !important;
  margin: 36px 0 12px !important;
}

.article-content p {
  font-size: 17.5px !important; line-height: 1.85 !important;
  color: rgba(232,232,240,0.87) !important;
  margin-bottom: 24px !important;
}

.article-content a {
  color: #60a5fa; text-decoration: underline;
  text-decoration-color: rgba(96,165,250,0.3);
  text-underline-offset: 3px;
  transition: text-decoration-color 0.15s;
}
.article-content a:hover { text-decoration-color: rgba(96,165,250,0.8); }

.article-content ul, .article-content ol {
  margin: 0 0 24px 24px !important;
}
.article-content li {
  font-size: 17px !important; line-height: 1.75 !important;
  color: rgba(232,232,240,0.82) !important;
  margin-bottom: 10px !important;
}

.article-content strong { color: var(--text) !important; font-weight: 600; }

.article-content blockquote, .article-content .pull-quote {
  border-left: 3px solid var(--red);
  margin: 36px 0 !important;
  padding: 4px 0 4px 24px;
}
.article-content blockquote p, .article-content .pull-quote p {
  font-family: var(--font-serif) !important;
  font-style: italic !important;
  font-size: 19px !important;
  color: rgba(232,232,240,0.75) !important;
  line-height: 1.7 !important;
}

/* ── CTA boxes ───────────────────────────────────────────────── */
.cta-box {
  background: var(--surface) !important;
  border: 1px solid var(--border) !important;
  border-left: 3px solid var(--red) !important;
  border-radius: 8px !important;
  padding: 28px 32px !important;
  margin: 48px 0 !important;
}
.cta-box h3 {
  font-family: var(--font-ui) !important;
  font-weight: 800 !important; font-size: 20px !important;
  margin-bottom: 10px !important; color: var(--text) !important;
}
.cta-box p {
  font-size: 15px !important; margin-bottom: 20px !important;
  color: var(--text-soft) !important;
}
.cta-box a {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--red) !important; color: #fff !important;
  font-weight: 600; font-size: 14px; text-decoration: none !important;
  padding: 12px 28px; border-radius: 4px;
  letter-spacing: 0.03em; transition: opacity 0.15s;
}
.cta-box a:hover { opacity: 0.85; }

/* ── Author bio ──────────────────────────────────────────────── */
.author-bio {
  display: flex; gap: 20px; align-items: flex-start;
  padding: 28px 32px;
  background: var(--surface); border-radius: 12px;
  border: 1px solid var(--border);
  margin: 56px 0 0;
}
.author-avatar {
  width: 52px; height: 52px; border-radius: 50%; flex-shrink: 0;
  background: linear-gradient(135deg, #1a1a2e, #E10000);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-ui); font-weight: 900;
  font-size: 16px; color: rgba(255,255,255,0.9);
  letter-spacing: 0.05em;
}
.author-info-name {
  font-family: var(--font-ui); font-weight: 700; font-size: 15px;
  color: var(--text); margin-bottom: 4px;
}
.author-info-title {
  font-size: 12px; color: var(--text-muted);
  text-transform: uppercase; letter-spacing: 0.08em;
  margin-bottom: 8px;
}
.author-info-bio {
  font-size: 14px !important; color: var(--text-soft) !important;
  line-height: 1.65 !important; margin: 0 !important;
}

/* ── TOC Sidebar ─────────────────────────────────────────────── */
.article-toc {
  position: sticky; top: 80px;
  background: var(--surface); border-radius: 12px;
  border: 1px solid var(--border);
  padding: 24px;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
}
.toc-heading {
  font-family: var(--font-ui); font-weight: 800;
  font-size: 11px; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--text-muted);
  margin-bottom: 16px;
}
.toc-list { list-style: none; }
.toc-list li { margin-bottom: 0; }
.toc-list a {
  display: block; font-size: 13px; color: var(--text-soft);
  text-decoration: none; padding: 6px 0;
  border-bottom: 1px solid transparent;
  line-height: 1.4;
  transition: color 0.15s;
}
.toc-list a:hover { color: var(--text); }
.toc-list a.active { color: var(--red); }
.toc-list .toc-h3 a { padding-left: 14px; font-size: 12px; }

/* ── Related posts ───────────────────────────────────────────── */
.related {
  border-top: 1px solid var(--border) !important;
  padding-top: 48px !important; margin-top: 64px !important;
}
.related > h3 {
  font-family: var(--font-ui) !important; font-weight: 800 !important;
  font-size: 11px !important; letter-spacing: 0.12em !important;
  text-transform: uppercase !important; color: var(--text-muted) !important;
  margin-bottom: 24px !important;
}
.related-grid {
  display: grid !important;
  grid-template-columns: repeat(3, minmax(0,1fr)) !important;
  gap: 16px !important;
}
@media (max-width: 900px) {
  .related-grid { grid-template-columns: repeat(2,minmax(0,1fr)) !important; }
}
@media (max-width: 600px) {
  .related-grid { grid-template-columns: minmax(0,1fr) !important; }
}
.related-card, .related-grid a {
  background: var(--surface) !important;
  border: 1px solid var(--border) !important;
  border-radius: 10px !important; padding: 18px !important;
  text-decoration: none !important; color: var(--text) !important;
  transition: border-color 0.2s, transform 0.2s;
  display: block !important;
}
.related-card:hover, .related-grid a:hover {
  border-color: var(--border-hi) !important;
  transform: translateY(-2px);
}
.related-card h4, .related-grid a h4 {
  font-family: var(--font-ui) !important; font-weight: 700 !important;
  font-size: 14px !important; margin-bottom: 8px !important;
  line-height: 1.35 !important; color: var(--text) !important;
}
.related-card p, .related-grid a p {
  font-size: 13px !important; color: var(--text-soft) !important;
  margin: 0 !important; line-height: 1.5 !important;
}

/* ── Footer ──────────────────────────────────────────────────── */
footer {
  border-top: 1px solid var(--border) !important;
  padding: 40px !important;
  text-align: center;
}
.footer-links { display: flex; gap: 24px; justify-content: center; margin-bottom: 16px; }
.footer-links a {
  font-size: 13px; color: var(--text-soft); text-decoration: none;
  transition: color 0.15s;
}
.footer-links a:hover { color: var(--text); }
.footer-copy { font-size: 12px; color: var(--text-muted); }

/* ── Blog INDEX ──────────────────────────────────────────────── */
.blog-header {
  max-width: 1200px; margin: 0 auto;
  padding: 100px 40px 48px;
  border-bottom: 1px solid var(--border);
}
.blog-header-label {
  font-family: var(--font-ui); font-weight: 900;
  font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--red); margin-bottom: 12px;
}
.blog-header h1 {
  font-family: var(--font-serif); font-weight: 700;
  font-size: clamp(32px,5vw,52px);
  letter-spacing: -0.02em; line-height: 1.1;
  color: var(--text); margin-bottom: 16px;
}
.blog-header p {
  font-size: 17px; color: var(--text-soft); max-width: 560px; line-height: 1.7;
}

/* Category filter tabs */
.cat-tabs {
  max-width: 1200px; margin: 0 auto;
  padding: 24px 40px 0;
  display: flex; gap: 8px; flex-wrap: wrap;
  border-bottom: 1px solid var(--border);
}
.cat-tab {
  padding: 10px 20px; font-size: 13px; font-weight: 600;
  border-radius: 0; border: none; background: none;
  color: var(--text-soft); cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
  font-family: var(--font-body);
  margin-bottom: -1px;
}
.cat-tab:hover { color: var(--text); }
.cat-tab.active { color: var(--text); border-bottom-color: var(--red); }

/* Featured hero post */
.blog-featured {
  max-width: 1200px; margin: 0 auto;
  padding: 40px 40px 0;
}
.featured-article {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 0; border-radius: 16px; overflow: hidden;
  background: var(--surface); border: 1px solid var(--border);
  text-decoration: none; color: var(--text);
  transition: border-color 0.2s;
}
.featured-article:hover { border-color: var(--border-hi); }
.featured-visual {
  background: linear-gradient(135deg, #0e1520 0%, #1a0a0a 50%, #0c0c12 100%);
  min-height: 280px; display: flex; align-items: center; justify-content: center;
  position: relative; overflow: hidden; padding: 40px;
}
.featured-visual::before {
  content: ''; position: absolute; inset: 0;
  background: repeating-linear-gradient(
    -45deg, transparent, transparent 40px,
    rgba(225,0,0,0.03) 40px, rgba(225,0,0,0.03) 41px
  );
}
.featured-visual-inner {
  position: relative; z-index: 1; text-align: center;
}
.featured-logo {
  width: 72px; height: 72px; border-radius: 16px;
  border: 1px solid rgba(225,0,0,0.2);
}
.featured-body {
  padding: 40px; display: flex; flex-direction: column; justify-content: center;
}
.featured-cat { margin-bottom: 16px; }
.featured-title {
  font-family: var(--font-serif); font-weight: 700;
  font-size: clamp(22px,2.5vw,30px); line-height: 1.25;
  color: var(--text); margin-bottom: 14px; letter-spacing: -0.01em;
}
.featured-excerpt {
  font-size: 15px; color: var(--text-soft);
  line-height: 1.65; margin-bottom: 24px;
}
.featured-meta {
  display: flex; gap: 16px; align-items: center;
  font-size: 13px; color: var(--text-muted);
}
.featured-read-more {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 14px; font-weight: 600; color: var(--red);
}

@media (max-width: 900px) {
  .featured-article { grid-template-columns: 1fr; }
  .featured-visual { min-height: 160px; }
}

/* Article grid */
.blog-grid-wrap {
  max-width: 1200px; margin: 0 auto; padding: 40px 40px 80px;
}
.blog-section-label {
  font-family: var(--font-ui); font-weight: 900;
  font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--text-muted); margin-bottom: 24px; padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0,1fr));
  gap: 20px;
}
@media (max-width: 900px) {
  .articles-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .blog-featured, .blog-grid-wrap, .blog-header, .cat-tabs { padding-left: 20px; padding-right: 20px; }
}
@media (max-width: 600px) {
  .articles-grid { grid-template-columns: minmax(0,1fr); }
}

/* Article card */
.article-card {
  background: var(--surface); border-radius: 12px;
  border: 1px solid var(--border);
  text-decoration: none; color: var(--text);
  transition: border-color 0.2s, transform 0.2s;
  display: flex; flex-direction: column; overflow: hidden;
}
.article-card:hover {
  border-color: var(--border-hi);
  transform: translateY(-2px);
}
.article-card-accent { height: 3px; flex-shrink: 0; }
.article-card-body { padding: 20px; flex: 1; display: flex; flex-direction: column; }
.article-card-cat { margin-bottom: 10px; }
.article-card-title {
  font-family: var(--font-ui); font-weight: 700;
  font-size: 15px; line-height: 1.4;
  color: var(--text); margin-bottom: 10px;
}
.article-card-excerpt {
  font-size: 13px; color: var(--text-soft);
  line-height: 1.6; flex: 1; margin-bottom: 16px;
  display: -webkit-box; -webkit-line-clamp: 2;
  -webkit-box-orient: vertical; overflow: hidden;
}
.article-card-meta {
  display: flex; gap: 12px; align-items: center;
  font-size: 12px; color: var(--text-muted);
  border-top: 1px solid var(--border); padding-top: 12px; margin-top: auto;
}

/* ── Scrollbar ───────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--surface2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-hi); }