/* FBA Expert — "Operator's Notebook" design system
   Palette:
   --ink     #15212B  deep ink navy (text, structure)
   --paper   #FBF8F1  warm paper (background)
   --ember   #D8591F  amazon-adjacent ember/orange (single accent)
   --slate   #5A6A78  muted captions/metadata
   --line    #E2DBCC  hairline rules on paper
   --panel   #11303A  dark panel for CTAs/footer
*/

:root {
  --ink: #15212B;
  --paper: #FBF8F1;
  --paper-2: #F3EDE0;
  --ember: #D8591F;
  --ember-deep: #B5431320;
  --slate: #5A6A78;
  --line: #E2DBCC;
  --panel: #11303A;
  --panel-line: #2A4A55;
  --maxw: 1140px;
  --readw: 680px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Source Serif 4", Georgia, "Times New Roman", serif;
  font-size: 19px;
  line-height: 1.65;
  font-feature-settings: "kern" 1, "liga" 1;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, .display, .eyebrow, nav, .meta, .btn, .tag, .site-title, table, .field-label {
  font-family: "Space Grotesk", "Helvetica Neue", Arial, sans-serif;
}

a { color: var(--ink); text-decoration: none; }
.prose a { color: var(--ink); text-decoration: underline; text-decoration-color: var(--ember); text-underline-offset: 3px; text-decoration-thickness: 2px; }
.prose a:hover { color: var(--ember); }

img { max-width: 100%; height: auto; display: block; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }

/* ---------- Skip link ---------- */
.skip { position: absolute; left: -9999px; top: 0; background: var(--ink); color: var(--paper); padding: 10px 16px; z-index: 100; }
.skip:focus { left: 8px; top: 8px; }

/* ---------- Header ---------- */
.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--paper);
  position: sticky; top: 0; z-index: 50;
}
.site-header .wrap {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 76px; gap: 20px;
}
.site-title {
  font-weight: 700; font-size: 22px; letter-spacing: -0.02em;
  display: flex; align-items: baseline; gap: 10px;
}
.site-title .mark {
  color: var(--ember);
  font-size: 13px; letter-spacing: 0.18em; text-transform: uppercase;
  border: 1.5px solid var(--ember); padding: 3px 7px; border-radius: 2px;
  font-weight: 500;
  position: relative; top: -2px;
}
.main-nav { display: flex; align-items: center; gap: 28px; }
.main-nav a {
  font-size: 14px; letter-spacing: 0.04em; text-transform: uppercase;
  font-weight: 500; color: var(--slate);
}
.main-nav a:hover, .main-nav a[aria-current="page"] { color: var(--ink); }
.main-nav a.nav-cta {
  color: var(--paper); background: var(--ink);
  padding: 9px 16px; border-radius: 2px; letter-spacing: 0.05em;
}
.main-nav a.nav-cta:hover { background: var(--ember); color: #fff; }

.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 6px; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--ink); margin: 5px 0; }

/* ---------- Eyebrow / labels ---------- */
.eyebrow {
  font-size: 12.5px; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--ember); font-weight: 600; margin: 0 0 14px;
}

/* ---------- Hero (home) ---------- */
.hero { padding: 86px 0 64px; border-bottom: 1px solid var(--line); }
.hero-grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: 60px; align-items: end; }
.hero h1 {
  font-size: clamp(40px, 6.4vw, 76px); line-height: 0.98; letter-spacing: -0.03em;
  margin: 0 0 24px; font-weight: 700;
}
.hero h1 em { font-style: normal; color: var(--ember); }
.hero-lead { font-size: 21px; color: var(--ink); max-width: 540px; margin: 0 0 30px; }
.hero-stats { border-left: 2px solid var(--ember); padding-left: 22px; }
.hero-stats .stat { margin-bottom: 22px; }
.hero-stats .stat:last-child { margin-bottom: 0; }
.hero-stats .num {
  font-family: "Space Grotesk", sans-serif; font-size: 34px; font-weight: 700;
  letter-spacing: -0.02em; line-height: 1; display: block;
}
.hero-stats .lbl { font-family: "Space Grotesk", sans-serif; font-size: 13px; letter-spacing: 0.04em; color: var(--slate); text-transform: uppercase; }

.btn {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 14px; font-weight: 600; letter-spacing: 0.05em; text-transform: uppercase;
  padding: 14px 26px; border-radius: 2px; cursor: pointer; border: 1.5px solid var(--ink);
  transition: background .15s, color .15s;
}
.btn-primary { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn-primary:hover { background: var(--ember); border-color: var(--ember); color: #fff; }
.btn-ghost { background: transparent; color: var(--ink); }
.btn-ghost:hover { background: var(--ink); color: var(--paper); }
.btn .arr { transition: transform .15s; }
.btn:hover .arr { transform: translateX(3px); }

/* ---------- Section headers ---------- */
.section { padding: 72px 0; }
.section-head { display: flex; align-items: flex-end; justify-content: space-between; margin-bottom: 40px; gap: 24px; border-bottom: 1px solid var(--line); padding-bottom: 18px; }
.section-head h2 { font-size: clamp(26px, 3.4vw, 38px); letter-spacing: -0.02em; margin: 0; font-weight: 700; }
.section-head .more { font-size: 14px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--slate); white-space: nowrap; }
.section-head .more:hover { color: var(--ember); }

/* ---------- Post index list (notebook entries) ---------- */
.entries { border-top: 1px solid var(--line); }
.entry {
  display: grid; grid-template-columns: 84px 1fr auto; gap: 28px; align-items: baseline;
  padding: 26px 0; border-bottom: 1px solid var(--line);
  transition: background .15s;
}
.entry:hover { background: var(--paper-2); }
.entry .idx { font-family: "Space Grotesk", sans-serif; font-size: 14px; color: var(--ember); font-weight: 600; letter-spacing: 0.02em; }
.entry .entry-title { display: block; font-size: clamp(21px, 2.4vw, 27px); letter-spacing: -0.015em; line-height: 1.18; font-weight: 600; }
.entry:hover .entry-title { color: var(--ember); }
.entry .entry-cat { display: block; font-family: "Space Grotesk", sans-serif; font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--slate); margin-top: 8px; }
.entry .entry-date { font-family: "Space Grotesk", sans-serif; font-size: 13px; color: var(--slate); white-space: nowrap; }

/* ---------- Article ---------- */
.article-header { padding: 64px 0 40px; border-bottom: 1px solid var(--line); }
.article-header .wrap { max-width: var(--readw); }
.breadcrumb { font-family: "Space Grotesk", sans-serif; font-size: 13px; color: var(--slate); margin-bottom: 26px; letter-spacing: 0.02em; }
.breadcrumb a:hover { color: var(--ember); }
.breadcrumb span { color: var(--line); margin: 0 8px; }
.article-header h1 { font-size: clamp(32px, 5vw, 52px); line-height: 1.05; letter-spacing: -0.025em; margin: 0 0 24px; font-weight: 700; }
.article-meta { display: flex; flex-wrap: wrap; gap: 18px; align-items: center; font-family: "Space Grotesk", sans-serif; font-size: 14px; color: var(--slate); }
.article-meta .byline strong { color: var(--ink); font-weight: 600; }
.article-meta .dot { width: 4px; height: 4px; border-radius: 50%; background: var(--line); }
.article-meta .updated { color: var(--ember); font-weight: 500; }

/* ---------- FAQ ---------- */
.faq { padding: 16px 0 8px; }
.faq .wrap { max-width: var(--readw); }
.faq-title { font-family: "Space Grotesk", sans-serif; font-size: 28px; letter-spacing: -0.015em; font-weight: 700; margin: 0 0 20px; padding-top: 36px; border-top: 1px solid var(--line); }
.faq-list { display: flex; flex-direction: column; gap: 0; }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-item summary {
  font-family: "Space Grotesk", sans-serif; font-size: 18px; font-weight: 600;
  padding: 20px 36px 20px 0; cursor: pointer; list-style: none; position: relative;
  letter-spacing: -0.01em; line-height: 1.35;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+"; position: absolute; right: 4px; top: 18px;
  font-size: 24px; font-weight: 400; color: var(--ember); transition: transform .2s;
}
.faq-item[open] summary::after { content: "\2212"; }
.faq-item summary:hover { color: var(--ember); }
.faq-answer { padding: 0 0 22px; }
.faq-answer p { margin: 0; color: var(--ink); font-size: 18px; line-height: 1.6; }

.article-body { padding: 48px 0 24px; }
.article-body .wrap { max-width: var(--readw); }
.prose > :first-child { margin-top: 0; }
.prose p { margin: 0 0 24px; }
.prose h2 { font-size: 28px; letter-spacing: -0.015em; margin: 48px 0 16px; font-weight: 700; line-height: 1.2; }
.prose h3 { font-size: 21px; letter-spacing: -0.01em; margin: 36px 0 12px; font-weight: 600; }
.prose ul, .prose ol { margin: 0 0 24px; padding-left: 26px; }
.prose li { margin-bottom: 10px; }
.prose blockquote {
  margin: 30px 0; padding: 4px 0 4px 26px; border-left: 3px solid var(--ember);
  font-style: italic; color: var(--ink);
}
.prose blockquote p:last-child { margin-bottom: 0; }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 40px 0; }
.prose strong { font-weight: 700; }
.prose code { background: var(--paper-2); padding: 2px 6px; border-radius: 3px; font-size: 0.9em; }

/* video embed */
.embed { position: relative; padding-bottom: 56.25%; height: 0; margin: 32px 0; background: var(--paper-2); border: 1px solid var(--line); }
.embed iframe { position: absolute; top: 0; left: 0; width: 100%; height: 100%; border: 0; }

/* ---------- Inline CTA in articles ---------- */
.inline-cta {
  margin: 44px 0; padding: 30px 32px; background: var(--panel); color: var(--paper);
  border-radius: 3px;
}
.inline-cta .eyebrow { color: #E8A07B; margin-bottom: 8px; }
.inline-cta p { font-family: "Space Grotesk", sans-serif; font-size: 19px; line-height: 1.4; margin: 0 0 18px; color: #fff; }
.inline-cta a.btn { border-color: var(--paper); color: var(--ink); background: var(--paper); }
.inline-cta a.btn:hover { background: var(--ember); border-color: var(--ember); color: #fff; }

/* ---------- Tags / footer of article ---------- */
.article-foot { padding: 8px 0 56px; }
.article-foot .wrap { max-width: var(--readw); }
.tagrow { display: flex; flex-wrap: wrap; gap: 10px; margin: 0 0 40px; padding-top: 28px; border-top: 1px solid var(--line); }
.tag {
  font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--slate);
  border: 1px solid var(--line); padding: 6px 12px; border-radius: 100px;
}
.tag:hover { border-color: var(--ember); color: var(--ember); }

.author-card { display: flex; gap: 20px; align-items: flex-start; padding: 28px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.author-card .ac-badge {
  flex: none; width: 58px; height: 58px; border-radius: 50%; background: var(--panel);
  color: var(--paper); display: flex; align-items: center; justify-content: center;
  font-family: "Space Grotesk", sans-serif; font-weight: 700; font-size: 20px;
}
.author-card h4 { margin: 0 0 6px; font-size: 17px; }
.author-card p { margin: 0; font-size: 16px; color: var(--slate); font-family: "Space Grotesk", sans-serif; line-height: 1.5; }

.post-nav { display: flex; justify-content: space-between; gap: 24px; margin-top: 36px; }
.post-nav a { flex: 1; padding: 20px 22px; border: 1px solid var(--line); border-radius: 3px; transition: border-color .15s; }
.post-nav a:hover { border-color: var(--ember); }
.post-nav .dir { font-family: "Space Grotesk", sans-serif; font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--slate); display: block; margin-bottom: 6px; }
.post-nav .ttl { font-family: "Space Grotesk", sans-serif; font-size: 16px; font-weight: 600; line-height: 1.25; }
.post-nav .next { text-align: right; }

/* ---------- Big CTA band ---------- */
.cta-band { background: var(--panel); color: var(--paper); padding: 80px 0; }
.cta-band .eyebrow { color: #E8A07B; }
.cta-band h2 { font-size: clamp(30px, 4.4vw, 52px); letter-spacing: -0.025em; line-height: 1.04; margin: 0 0 22px; font-weight: 700; max-width: 760px; }
.cta-band p { font-size: 20px; max-width: 600px; color: #D7E0E0; margin: 0 0 32px; }
.cta-band .btn { background: var(--ember); border-color: var(--ember); color: #fff; }
.cta-band .btn:hover { background: #fff; border-color: #fff; color: var(--ink); }

/* ---------- About ---------- */
.about-hero { padding: 80px 0 56px; border-bottom: 1px solid var(--line); }
.about-hero .wrap { max-width: var(--readw); }
.about-hero h1 { font-size: clamp(34px, 5.4vw, 60px); letter-spacing: -0.03em; line-height: 1; margin: 0 0 24px; }
.about-body { padding: 48px 0; }
.about-body .wrap { max-width: var(--readw); }

/* ---------- About photo ---------- */
.about-photo { padding: 40px 0 8px; }
.about-photo .wrap { max-width: var(--readw); }
.about-photo figure { margin: 0; max-width: 380px; }
.about-photo img {
  width: 100%; height: auto; border-radius: 4px; display: block;
  border: 1px solid var(--line);
}
.about-photo figcaption {
  font-family: "Space Grotesk", sans-serif; font-size: 14px; color: var(--slate);
  margin-top: 12px; letter-spacing: 0.01em;
}

/* ---------- Footer ---------- */
.site-footer { background: var(--panel); color: #BFCBCB; padding: 60px 0 36px; }
.site-footer a { color: #BFCBCB; }
.site-footer a:hover { color: #fff; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; margin-bottom: 44px; }
.footer-brand .site-title { color: var(--paper); margin-bottom: 14px; }
.footer-brand p { font-family: "Space Grotesk", sans-serif; font-size: 15px; max-width: 320px; line-height: 1.55; }
.footer-col h5 { font-family: "Space Grotesk", sans-serif; font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase; color: #7E9097; margin: 0 0 16px; }
.footer-col ul { list-style: none; margin: 0; padding: 0; }
.footer-col li { margin-bottom: 11px; font-family: "Space Grotesk", sans-serif; font-size: 15px; }
.footer-bottom { border-top: 1px solid var(--panel-line); padding-top: 24px; font-family: "Space Grotesk", sans-serif; font-size: 13px; color: #7E9097; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

/* ---------- Page intro (hub pages) ---------- */
.page-intro { padding: 72px 0 36px; border-bottom: 1px solid var(--line); }
.page-intro h1 { font-size: clamp(34px, 5vw, 58px); letter-spacing: -0.03em; line-height: 1; margin: 0 0 20px; }
.page-intro p { font-size: 20px; color: var(--slate); max-width: 620px; margin: 0; }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  body { font-size: 18px; }
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .main-nav { position: fixed; inset: 76px 0 auto 0; background: var(--paper); flex-direction: column; align-items: flex-start; gap: 0; padding: 8px 28px 20px; border-bottom: 1px solid var(--line); display: none; }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 14px 0; width: 100%; border-bottom: 1px solid var(--line); font-size: 16px; }
  .main-nav a.nav-cta { margin-top: 12px; border: 0; text-align: center; }
  .nav-toggle { display: block; }
  .entry { grid-template-columns: 48px 1fr; gap: 16px; }
  .entry .entry-date { display: none; }
  .post-nav { flex-direction: column; }
  .post-nav .next { text-align: left; }
}
@media (max-width: 540px) {
  .wrap { padding: 0 20px; }
  .footer-grid { grid-template-columns: 1fr; }
  .section, .hero { padding-left: 0; padding-right: 0; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}