/* Textbook Turnaround — Amazon-inspired palette */
:root {
  --ink: #0F1111;
  --ink-soft: #565959;
  --navy: #131921;
  --navy-2: #232F3E;
  --navy-3: #37475A;
  --orange: #FF9900;
  --orange-2: #FFA41C;
  --yellow: #FFD814;
  --yellow-hover: #F7CA00;
  --peach: #FEBD69;
  --link: #007185;
  --link-hover: #C7511F;
  --bg: #EAEDED;
  --card: #FFFFFF;
  --line: #D5D9D9;
  --tint: #F7FAFA;
  --success: #067D62;
  --radius: 8px;
  --shadow: 0 2px 5px rgba(15, 17, 17, .12);
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.65 "Amazon Ember", Arial, "Helvetica Neue", Helvetica, sans-serif; }
a { color: var(--link); text-decoration: none; }
a:hover { color: var(--link-hover); text-decoration: underline; }
img { max-width: 100%; height: auto; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
.wrap { max-width: 1240px; margin: 0 auto; padding: 0 16px; }
.wrap.narrow { max-width: 860px; }

/* Header */
.site-header { background: var(--navy); color: #fff; position: sticky; top: 0; z-index: 50; }
.topbar { display: flex; align-items: center; gap: 14px; max-width: 1240px; margin: 0 auto; padding: 8px 16px; }
.logo { display: flex; align-items: center; gap: 8px; color: #fff; font-size: 20px; letter-spacing: -.3px; white-space: nowrap; }
.logo:hover { color: #fff; text-decoration: none; outline: 1px solid #fff; outline-offset: 3px; border-radius: 2px; }
.logo b { color: var(--orange); font-weight: 700; }
.search { flex: 1; display: flex; max-width: 640px; height: 40px; border-radius: 4px; overflow: hidden; }
.search:focus-within { box-shadow: 0 0 0 3px var(--orange); }
.search input { flex: 1; border: 0; padding: 0 12px; font-size: 15px; min-width: 0; }
.search input:focus { outline: none; }
.search button { width: 46px; border: 0; background: var(--peach); font-size: 20px; cursor: pointer; }
.search button:hover { background: var(--orange-2); }
.menu-toggle { display: none; background: none; color: #fff; border: 1px solid transparent; font-size: 16px; padding: 6px 8px; cursor: pointer; }
.catnav { background: var(--navy-2); }
.catnav ul { list-style: none; display: flex; flex-wrap: wrap; gap: 2px; max-width: 1240px; margin: 0 auto; padding: 4px 12px; }
.catnav a { display: block; color: #fff; font-size: 14px; padding: 6px 9px; border: 1px solid transparent; border-radius: 2px; }
.catnav a:hover { border-color: #fff; text-decoration: none; color: #fff; }
.catnav li:last-child a { color: var(--orange); font-weight: 700; }

/* Buttons */
.btn { display: inline-block; text-align: center; font-weight: 600; border-radius: 100px; padding: 10px 20px; font-size: 15px; line-height: 1.3; border: 1px solid transparent; cursor: pointer; }
.btn:hover { text-decoration: none; }
.btn-buy { background: var(--yellow); color: var(--ink); border-color: #FCD200; box-shadow: 0 2px 5px rgba(213, 217, 217, .5); }
.btn-buy:hover { background: var(--yellow-hover); color: var(--ink); }
.btn-alt { background: var(--orange-2); color: var(--ink); border-color: #FF8F00; }
.btn-alt:hover { background: #FA8900; color: var(--ink); }
.btn-ghost { background: transparent; color: #fff; border-color: #fff; }
.btn-ghost:hover { background: rgba(255, 255, 255, .1); color: #fff; }
.btn-lg { padding: 13px 26px; font-size: 16px; }
.top-cta { white-space: nowrap; }

/* Hero */
.hero { background: linear-gradient(180deg, var(--navy-2) 0%, var(--navy-3) 100%); color: #fff; padding: 48px 0 56px; }
.hero-inner { display: grid; grid-template-columns: 1.4fr 1fr; gap: 40px; align-items: center; }
.hero h1 { font-size: clamp(30px, 4.4vw, 48px); line-height: 1.12; margin: 6px 0 14px; }
.hero-sub { font-size: 18px; color: #DDE3E8; max-width: 640px; }
.hero-ctas { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 22px; }
.kicker { text-transform: uppercase; letter-spacing: .08em; font-size: 13px; font-weight: 700; color: var(--link-hover); margin: 0; }
.kicker.light { color: var(--orange); }
.hero-card { background: #fff; color: var(--ink); border-radius: var(--radius); padding: 22px; box-shadow: 0 8px 24px rgba(0, 0, 0, .25); border-top: 4px solid var(--orange); }
.hc-label { font-size: 13px; text-transform: uppercase; font-weight: 700; color: var(--ink-soft); margin: 0 0 10px; }
.hc-row { display: flex; justify-content: space-between; padding: 8px 0; border-bottom: 1px solid var(--line); }
.hc-row.total { border: 0; font-size: 18px; color: var(--success); }
.hc-note { font-size: 13px; color: var(--ink-soft); margin: 10px 0 0; }

/* Home */
section { margin: 32px 0; }
h2 { font-size: 26px; line-height: 1.25; }
.steps { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; counter-reset: s; }
.steps li { background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); position: relative; }
.steps a { display: block; padding: 18px 16px 16px; color: var(--ink); height: 100%; }
.steps a:hover { text-decoration: none; }
.steps a:hover strong { color: var(--link-hover); }
.steps strong { display: block; font-size: 17px; margin-top: 6px; }
.steps span:not(.step-n) { font-size: 14px; color: var(--ink-soft); }
.step-n { position: absolute; top: -10px; left: 14px; background: var(--orange); color: var(--ink); width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center; font-weight: 700; font-size: 14px; }
.quick { background: var(--card); border-left: 5px solid var(--orange); border-radius: var(--radius); padding: 6px 22px 10px; box-shadow: var(--shadow); }
.home-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; }
.home-card { background: var(--card); border-radius: var(--radius); padding: 18px 20px; box-shadow: var(--shadow); }
.home-card h3 { margin: 0 0 4px; font-size: 20px; }
.home-card h3 a { color: var(--ink); }
.home-card p { margin: 0 0 8px; color: var(--ink-soft); font-size: 14px; }
.home-card ul { padding-left: 18px; margin: 0 0 10px; font-size: 15px; }
.home-card li { margin: 4px 0; }
.more { font-weight: 600; font-size: 15px; }

/* Breadcrumbs */
.breadcrumbs { font-size: 14px; color: var(--ink-soft); margin: 16px 0 8px; }
.breadcrumbs a { color: var(--ink-soft); }
.breadcrumbs a:hover { color: var(--link-hover); }

/* Article */
.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 24px; align-items: start; padding-bottom: 24px; }
.article { background: var(--card); border-radius: var(--radius); padding: 8px 40px 32px; box-shadow: var(--shadow); margin: 16px 0; min-width: 0; }
.article h1 { font-size: clamp(28px, 3.6vw, 38px); line-height: 1.18; margin: 8px 0 10px; }
.byline { color: var(--ink-soft); font-size: 14px; margin: 0 0 8px; }
.disclosure { font-size: 13px; background: var(--tint); border: 1px solid var(--line); border-radius: 4px; padding: 8px 12px; color: var(--ink-soft); }
.prose { font-size: 17px; }
.prose h2 { font-size: 26px; margin: 38px 0 10px; padding-top: 8px; scroll-margin-top: 120px; }
.prose h3 { font-size: 20px; margin: 26px 0 6px; }
.prose h4 { font-size: 17px; margin: 20px 0 4px; }
.prose li { margin: 6px 0; }
.prose blockquote { border-left: 4px solid var(--orange); margin: 20px 0; padding: 4px 18px; background: var(--tint); }
.lede { font-size: 19px; line-height: 1.6; border-left: 4px solid var(--orange); padding-left: 14px; }
.key-takeaways { background: #FFF8E7; border: 1px solid var(--peach); border-radius: var(--radius); padding: 4px 22px 10px; margin: 22px 0; }
.key-takeaways h2 { font-size: 19px; margin: 14px 0 4px; padding: 0; }
.callout { background: #F0F8FF; border-left: 4px solid var(--link); border-radius: 4px; padding: 10px 18px; margin: 20px 0; }
.example { background: #F3FBF7; border-left: 4px solid var(--success); border-radius: 4px; padding: 10px 18px; margin: 20px 0; }
.callout > :first-child, .example > :first-child { margin-top: 6px; }
.table-wrap { overflow-x: auto; margin: 20px 0; border: 1px solid var(--line); border-radius: var(--radius); }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
th, td { padding: 10px 12px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); }
th { background: var(--navy-2); color: #fff; font-weight: 600; }
tr:nth-child(even) td { background: var(--tint); }
tr:last-child td { border-bottom: 0; }
.toc { background: var(--tint); border: 1px solid var(--line); border-radius: var(--radius); padding: 10px 20px; margin: 18px 0; }
.toc-title { font-weight: 700; margin: 4px 0; }
.toc ol { margin: 0; padding-left: 20px; columns: 2; column-gap: 32px; font-size: 15px; }
.toc li { margin: 4px 0; break-inside: avoid; }

/* CTA box */
.cta-box { position: relative; background: linear-gradient(135deg, var(--navy-2), var(--navy)); color: #fff; border-radius: var(--radius); padding: 24px 26px 18px; margin: 32px 0; border-bottom: 4px solid var(--orange); }
.cta-badge { display: inline-block; background: var(--orange); color: var(--ink); font-weight: 700; font-size: 12px; text-transform: uppercase; letter-spacing: .06em; padding: 3px 10px; border-radius: 100px; }
.cta-box .cta-title { color: #fff; font-size: 23px; margin: 10px 0 6px; padding: 0; }
.cta-box p { color: #DDE3E8; margin: 0 0 14px; font-size: 16px; }
.cta-box .cta-fine { font-size: 12.5px; color: #AAB7C4; margin: 12px 0 0; }
.cta-box .cta-fine a { color: var(--peach); }

/* FAQ */
.faq { margin-top: 36px; }
.faq h2 { font-size: 26px; }
.faq-item { border-top: 1px solid var(--line); padding: 6px 0; }
.faq-item h3 { font-size: 18px; margin: 12px 0 4px; }
.faq-item p { margin: 0 0 10px; }

/* Related cards */
.cards { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 12px; }
.cards a { display: block; height: 100%; padding: 14px 16px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); color: var(--ink); }
.cards a:hover { border-color: var(--orange); text-decoration: none; box-shadow: var(--shadow); }
.cards a:hover strong { color: var(--link-hover); }
.cards strong { display: block; color: var(--link); font-size: 16px; line-height: 1.35; margin-bottom: 4px; }
.cards span { font-size: 14px; color: var(--ink-soft); line-height: 1.45; }
.related { border-top: 2px solid var(--bg); padding-top: 8px; }

/* Sidebar */
.sidebar { position: sticky; top: 110px; margin-top: 16px; display: grid; gap: 16px; }
.side-card { background: var(--card); border-radius: var(--radius); padding: 16px 18px; box-shadow: var(--shadow); }
.buybox { border: 1px solid var(--line); }
.side-kicker { color: var(--link-hover); font-size: 12px; font-weight: 700; text-transform: uppercase; margin: 0; }
.side-title { font-weight: 700; font-size: 17px; margin: 4px 0 8px; }
.checks { list-style: none; padding: 0; margin: 0 0 12px; font-size: 14px; }
.checks li { padding-left: 22px; position: relative; margin: 5px 0; }
.checks li::before { content: "\2713"; position: absolute; left: 0; color: var(--success); font-weight: 700; }
.buybox .btn { display: block; margin-top: 8px; }
.side-fine { font-size: 12px; color: var(--ink-soft); margin: 8px 0 0; }
.side-links { list-style: none; padding: 0; margin: 0; font-size: 14px; max-height: 50vh; overflow: auto; }
.side-links li { border-top: 1px solid var(--bg); }
.side-links a { display: block; padding: 6px 0; line-height: 1.35; }
.side-links a[aria-current] { color: var(--ink); font-weight: 700; }

/* Hub */
.hub-hero { background: var(--card); border-radius: var(--radius); padding: 10px 32px 16px; box-shadow: var(--shadow); margin-top: 8px; }
.hub-hero h1 { font-size: clamp(28px, 3.6vw, 40px); margin: 14px 0 6px; }
.hub-intro { font-size: 17px; max-width: 900px; }
.pillar-feature { background: #FFF8E7; border: 1px solid var(--peach); border-radius: var(--radius); padding: 18px 26px 22px; }
.pillar-feature h2 { margin: 6px 0; }
.pillar-feature h2 a { color: var(--ink); }
.pill-list { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.pill-list a { display: inline-block; background: var(--card); border: 1px solid var(--line); border-radius: 100px; padding: 6px 14px; color: var(--ink); }
.pill-list a:hover { border-color: var(--orange); text-decoration: none; }
main > .faq, .wrap > .faq { background: var(--card); border-radius: var(--radius); padding: 6px 28px 14px; box-shadow: var(--shadow); }

/* Site map */
.sitemap-grid { columns: 3 300px; column-gap: 24px; }
.sm-sec { break-inside: avoid; background: var(--card); border-radius: var(--radius); padding: 4px 18px 10px; margin: 0 0 18px; box-shadow: var(--shadow); }
.sm-sec h2 { font-size: 19px; }
.sm-sec ul { padding-left: 18px; font-size: 14px; }
.filter-wrap input { padding: 8px 12px; border: 1px solid var(--line); border-radius: 4px; width: min(420px, 100%); font-size: 15px; }

/* Footer */
.site-footer { background: var(--navy-2); color: #DDD; margin-top: 40px; }
.back-top { display: block; text-align: center; background: var(--navy-3); color: #fff; padding: 14px; font-size: 14px; }
.back-top:hover { background: #485769; color: #fff; text-decoration: none; }
.footer-grid { max-width: 1000px; margin: 0 auto; padding: 32px 16px 8px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.site-footer h2 { color: #fff; font-size: 16px; margin: 0 0 8px; }
.site-footer ul { list-style: none; padding: 0; margin: 0; font-size: 14px; }
.site-footer li { margin: 6px 0; }
.site-footer a { color: #DDD; }
.site-footer a:hover { color: #fff; }
.fine { max-width: 1000px; margin: 0 auto; padding: 16px 16px 90px; font-size: 12.5px; color: #AAB7C4; border-top: 1px solid var(--navy-3); }

/* Sticky mobile CTA */
.sticky-cta { display: none; }

/* Popup */
.popup { position: fixed; inset: 0; background: rgba(15, 17, 17, .6); z-index: 100; display: grid; place-items: center; padding: 16px; }
.popup[hidden] { display: none; }
.popup-box { position: relative; background: #fff; border-radius: 12px; max-width: 460px; width: 100%; padding: 28px 26px 20px; border-top: 6px solid var(--orange); text-align: center; box-shadow: 0 16px 40px rgba(0, 0, 0, .3); }
.popup-box h2 { font-size: 23px; margin: 6px 0 10px; }
.popup-kicker { color: var(--link-hover); font-weight: 700; font-size: 13px; text-transform: uppercase; margin: 0; }
.popup-fine { font-size: 12px; color: var(--ink-soft); margin: 12px 0 0; }
.popup-close { position: absolute; top: 6px; right: 10px; border: 0; background: none; font-size: 30px; line-height: 1; cursor: pointer; color: var(--ink-soft); }

/* Responsive */
@media (max-width: 1020px) {
  .article-layout { grid-template-columns: 1fr; }
  .sidebar { position: static; margin-top: 0; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .top-cta { display: none; }
}
@media (max-width: 760px) {
  .topbar { flex-wrap: wrap; }
  .search { order: 3; flex-basis: 100%; max-width: none; }
  .menu-toggle { display: block; margin-left: auto; }
  .catnav { display: none; }
  .catnav.open { display: block; }
  .catnav ul { flex-direction: column; padding: 6px 12px 12px; }
  .hero { padding: 32px 0 40px; }
  .hero-inner { grid-template-columns: 1fr; gap: 24px; }
  .article { padding: 4px 18px 24px; }
  .hub-hero { padding: 6px 18px 12px; }
  .pillar-feature { padding: 14px 18px 18px; }
  .toc ol { columns: 1; }
  .prose { font-size: 16.5px; }
  .steps { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .site-header { position: static; }
  main > .faq, .wrap > .faq { padding: 4px 18px 10px; }
  .sticky-cta { display: flex; position: fixed; left: 0; right: 0; bottom: 0; z-index: 60; background: var(--navy); color: #fff; align-items: center; justify-content: space-between; gap: 10px; padding: 10px 16px; font-size: 14px; box-shadow: 0 -2px 8px rgba(0, 0, 0, .25); }
  .sticky-cta .btn { padding: 8px 16px; white-space: nowrap; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }