/* ═══════════════════════════════════════════════════════════════════════════
   blog.css — FactoryLM Blog
   Mirrors the index.html design system exactly: same tokens, nav, footer,
   type scale, and component patterns.
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --page-bg:    #0d0e11;
  --surface:    #13141a;
  --border:     rgba(255,255,255,0.07);
  --border-hi:  rgba(255,255,255,0.12);
  --text:       #e8eaf0;
  --text-dim:   rgba(255,255,255,0.5);
  --text-faint: rgba(255,255,255,0.28);
  --text-label: rgba(255,255,255,0.35);
  --amber:      #f0a000;
  --teal:       #00d4aa;
  --green:      #34d399;
  --blue:       #60a5fa;
  --red:        #f87171;
  --font:       'Inter', 'Helvetica Neue', sans-serif;
  --max-w:      1080px;
  --ease-out:   cubic-bezier(0.16,1,0.3,1);
}

html { scroll-behavior: smooth; }

body {
  background: var(--page-bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Amber radial gradient — site-wide brand tint */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(240,160,0,0.06) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}

a { color: var(--amber); text-decoration: none; transition: color 150ms ease; }
a:hover { text-decoration: underline; }

/* ── Layout ── */
.inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 40px;
}
@media (max-width: 768px) { .inner { padding: 0 24px; } }
@media (max-width: 480px) { .inner { padding: 0 16px; } }

/* ── Navigation (matches index.html exactly) ── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 56px;
  z-index: 100;
  transition: background 200ms ease, border-color 200ms ease;
  border-bottom: 1px solid transparent;
}
nav.scrolled {
  background: rgba(13,14,17,0.85);
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  border-bottom-color: rgba(255,255,255,0.06);
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 40px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
@media (max-width: 768px) { .nav-inner { padding: 0 24px; } }

.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--text);
  font-weight: 500;
  font-size: 15px;
  letter-spacing: -0.01em;
}
.nav-logo:hover { text-decoration: none; }
.nav-logo svg { width: 22px; height: 22px; flex-shrink: 0; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}
.nav-links a {
  font-size: 14px;
  color: rgba(255,255,255,0.6);
  text-decoration: none;
  letter-spacing: normal;
  transition: color 150ms ease;
}
.nav-links a:hover { color: var(--text); text-decoration: none; }

.nav-cta {
  font-size: 14px;
  font-weight: 500;
  color: rgba(255,255,255,0.7);
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: 6px;
  padding: 7px 14px;
  text-decoration: none;
  cursor: pointer;
  transition: background 150ms ease, border-color 150ms ease, color 150ms ease;
  white-space: nowrap;
}
.nav-cta:hover {
  background: rgba(255,255,255,0.13);
  border-color: rgba(255,255,255,0.22);
  color: #fff;
  text-decoration: none;
}

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

/* ── Footer (matches index.html exactly) ── */
footer {
  padding: 40px 0;
  border-top: 1px solid var(--border);
  position: relative;
  z-index: 1;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-dim);
  text-decoration: none;
}
.footer-logo:hover { text-decoration: none; }
.footer-links {
  display: flex;
  gap: 20px;
  list-style: none;
}
.footer-links a {
  font-size: 13px;
  color: var(--text-faint);
  text-decoration: none;
  transition: color 150ms ease;
}
.footer-links a:hover { color: var(--text-dim); text-decoration: none; }

/* ── Buttons (match index.html) ── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #fff;
  color: #000;
  border: none;
  border-radius: 6px;
  padding: 9px 18px;
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: opacity 150ms ease;
  white-space: nowrap;
}
.btn-primary:hover { opacity: 0.9; text-decoration: none; }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  color: rgba(255,255,255,0.7);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: 6px;
  padding: 9px 18px;
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: background 150ms ease, border-color 150ms ease, color 150ms ease;
}
.btn-ghost:hover {
  background: rgba(255,255,255,0.06);
  border-color: rgba(255,255,255,0.22);
  color: #fff;
  text-decoration: none;
}

/* Section label */
.section-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-label);
  margin-bottom: 12px;
  font-weight: 500;
}

/* ── Scroll animation ── */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 400ms ease, transform 400ms ease;
}
.fade-in.visible { opacity: 1; transform: translateY(0); }
.fade-in:nth-child(2) { transition-delay: 80ms; }
.fade-in:nth-child(3) { transition-delay: 160ms; }
.fade-in:nth-child(4) { transition-delay: 240ms; }
@media (prefers-reduced-motion: reduce) {
  .fade-in { opacity: 1; transform: none; transition: none; }
}

/* ═══════════════════════════════════════════════════════════════════════════
   Blog-specific components
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── Blog hero ── */
.blog-hero {
  padding: 120px 0 48px;
  text-align: center;
  position: relative;
  z-index: 1;
}
.blog-hero h1 {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 400;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 14px;
}
.blog-hero p {
  font-size: 15px;
  color: var(--text-dim);
  line-height: 1.65;
  max-width: 520px;
  margin: 0 auto;
  font-weight: 300;
}

/* ── Article page layout ── */
.article-wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 100px 40px 80px;
  position: relative;
  z-index: 1;
}
@media (max-width: 768px) { .article-wrap { padding: 88px 24px 60px; } }
@media (max-width: 480px) { .article-wrap { padding: 80px 16px 48px; } }

.breadcrumb {
  font-size: 13px;
  color: var(--text-faint);
  margin-bottom: 32px;
}
.breadcrumb a { color: var(--text-faint); }
.breadcrumb a:hover { color: var(--text-dim); }

.article-wrap h1 {
  font-size: clamp(24px, 3.5vw, 36px);
  font-weight: 400;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 12px;
}

.meta-line {
  font-size: 13px;
  color: var(--text-faint);
  margin-bottom: 40px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.meta-tag {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 500;
  color: var(--amber);
  background: rgba(240,160,0,0.1);
  padding: 3px 8px;
  border-radius: 4px;
}

.article-wrap h2 {
  font-size: 18px;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--text);
  margin: 40px 0 16px;
}
.article-wrap h2:first-of-type { margin-top: 0; }

.article-wrap p {
  color: var(--text-dim);
  font-weight: 300;
  line-height: 1.7;
  margin-bottom: 16px;
}

.article-wrap ul,
.article-wrap ol {
  margin: 0 0 24px 20px;
  color: var(--text-dim);
  font-weight: 300;
}
.article-wrap li {
  margin-bottom: 8px;
  line-height: 1.65;
}

/* ── Callouts ── */
.callout {
  border-left: 2px solid var(--border-hi);
  background: rgba(255,255,255,0.02);
  padding: 16px 20px;
  margin: 24px 0;
  border-radius: 0 8px 8px 0;
}
.callout.tip { border-color: var(--green); }
.callout.warning { border-color: var(--red); }
.callout.info { border-color: var(--blue); }

.callout-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 6px;
}
.callout.tip .callout-label { color: var(--green); }
.callout.warning .callout-label { color: var(--red); }
.callout.info .callout-label { color: var(--blue); }
.callout p { margin: 0; font-size: 14px; }

/* ── Blockquote ── */
.article-wrap blockquote {
  border-left: 2px solid var(--border-hi);
  padding: 12px 20px;
  margin: 24px 0;
  font-style: italic;
  color: var(--text-dim);
}
.article-wrap blockquote cite {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  font-style: normal;
  color: var(--text-faint);
}

/* ── CTA card ── */
.cta-card {
  background: var(--surface);
  border: 1px solid var(--border-hi);
  border-radius: 12px;
  padding: 40px;
  margin: 48px 0;
  text-align: center;
}
.cta-card h3 {
  font-size: 18px;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin-bottom: 8px;
}
.cta-card p {
  color: var(--text-dim) !important;
  font-size: 14px !important;
  margin-bottom: 20px;
  font-weight: 300;
}

/* ── Related section ── */
.related {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}
.related h2 { margin-top: 0 !important; }
.related ul { list-style: none; margin-left: 0; }
.related li { margin-bottom: 8px; }
.related a { color: var(--text-dim); font-size: 14px; }
.related a:hover { color: var(--text); }

/* ═══════════════════════════════════════════════════════════════════════════
   Blog index
   ═══════════════════════════════════════════════════════════════════════════ */

.blog-section {
  position: relative;
  z-index: 1;
  padding-bottom: 48px;
}
.blog-section h2 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-faint);
  font-weight: 500;
  margin-bottom: 20px;
}

/* Post cards */
.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}
.post-card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
  transition: border-color 200ms ease;
  text-decoration: none;
}
.post-card:hover { border-color: rgba(255,255,255,0.18); text-decoration: none; }

.post-hero {
  width: 40px; height: 40px;
  border-radius: 8px;
  background: rgba(240,160,0,0.1);
  color: var(--amber);
  display: flex; align-items: center; justify-content: center;
  font-weight: 600; font-size: 15px;
  margin-bottom: 16px;
}
.post-meta {
  font-size: 12px;
  color: var(--text-faint);
  margin-bottom: 8px;
  display: flex; gap: 10px; align-items: center;
}
.post-meta .meta-tag { font-size: 10px; padding: 2px 6px; }
.post-title {
  font-weight: 500;
  font-size: 15px;
  color: var(--text);
  margin-bottom: 8px;
  line-height: 1.35;
  letter-spacing: -0.01em;
}
.post-desc {
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.55;
  font-weight: 300;
}

/* Fault code library link card */
.fc-library-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  transition: border-color 200ms ease;
  text-decoration: none;
}
.fc-library-card:hover { border-color: rgba(255,255,255,0.18); text-decoration: none; }
.fc-library-card .fc-lib-text h3 {
  font-size: 15px; font-weight: 500; color: var(--text);
  margin-bottom: 4px; letter-spacing: -0.01em;
}
.fc-library-card .fc-lib-text p {
  font-size: 13px; color: var(--text-dim); font-weight: 300;
}

/* ═══════════════════════════════════════════════════════════════════════════
   Fault code library index
   ═══════════════════════════════════════════════════════════════════════════ */

.mfr-section {
  padding-bottom: 40px;
}
.mfr-section h2 {
  font-size: 15px !important;
  text-transform: none !important;
  letter-spacing: -0.01em !important;
  color: var(--text) !important;
  font-weight: 500 !important;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 12px;
}
.fc-card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  transition: border-color 200ms ease;
  text-decoration: none;
}
.fc-card:hover { border-color: rgba(255,255,255,0.18); text-decoration: none; }
.fc-card .code {
  font-size: 11px;
  font-weight: 600;
  color: var(--amber);
  letter-spacing: 0.02em;
  margin-bottom: 4px;
}
.fc-card .card-title {
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 6px;
  line-height: 1.3;
  letter-spacing: -0.01em;
}
.fc-card .card-desc {
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.5;
  font-weight: 300;
}

@media (max-width: 640px) {
  .post-grid { grid-template-columns: 1fr; }
  .card-grid { grid-template-columns: 1fr; }
  .fc-library-card { flex-direction: column; align-items: flex-start; }
}