/* Gem Knowledge Base — knowledge-base magazine/index style
   Palette: paper #fbfaf7, deep green #1f4d3a, amber #c8872f */

:root {
  --paper: #fbfaf7;
  --paper-2: #f3f0e8;
  --ink: #1c2320;
  --ink-soft: #4a5550;
  --green: #1f4d3a;
  --green-dark: #163a2b;
  --amber: #c8872f;
  --amber-soft: #e9c98f;
  --line: #e3ddce;
  --card: #ffffff;
  --serif: Georgia, 'Times New Roman', Times, serif;
  --sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--green); text-decoration: none; }
a:hover { color: var(--amber); }

.container { max-width: 1180px; margin: 0 auto; padding: 0 20px; }
.container.narrow { max-width: 820px; }

.skip-link { position: absolute; left: -9999px; top: 0; background: var(--green); color: #fff; padding: 8px 12px; z-index: 100; }
.skip-link:focus { left: 10px; top: 10px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}
.topbar { background: var(--green); color: #fff; }
.topbar-inner { display: flex; align-items: center; gap: 20px; padding: 12px 20px; }
.brand { display: flex; align-items: center; gap: 10px; color: #fff; font-family: var(--serif); font-size: 1.15rem; }
.brand:hover { color: var(--amber-soft); }
.brand-mark { color: var(--amber); font-size: 1.3rem; }
.brand-text em { font-style: italic; color: var(--amber-soft); }

.searchbox { flex: 1; max-width: 520px; display: flex; background: rgba(255,255,255,0.12); border: 1px solid rgba(255,255,255,0.25); border-radius: 999px; overflow: hidden; }
.searchbox input { flex: 1; background: transparent; border: 0; padding: 9px 16px; color: #fff; font-size: 0.95rem; outline: none; }
.searchbox input::placeholder { color: rgba(255,255,255,0.7); }
.searchbox button { background: var(--amber); border: 0; color: #fff; padding: 0 18px; font-size: 1.05rem; cursor: pointer; }

.hamburger { display: none; background: transparent; border: 1px solid rgba(255,255,255,0.4); border-radius: 6px; padding: 8px 10px; cursor: pointer; flex-direction: column; gap: 4px; }
.hamburger span { display: block; width: 18px; height: 2px; background: #fff; }

.catnav { background: var(--paper-2); border-bottom: 1px solid var(--line); }
.catnav-inner { display: flex; flex-wrap: wrap; gap: 4px; padding: 8px 20px; }
.catnav a { color: var(--green); padding: 6px 12px; border-radius: 4px; font-size: 0.92rem; font-weight: 500; }
.catnav a:hover { background: var(--green); color: #fff; }

/* Drawer */
.drawer { position: fixed; top: 0; right: -320px; width: 300px; max-width: 85vw; height: 100vh; background: var(--paper); z-index: 80; box-shadow: -4px 0 20px rgba(0,0,0,0.15); transition: right 0.25s ease; padding: 20px; }
.drawer.open { right: 0; }
.drawer-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.drawer-head button { background: none; border: 0; font-size: 1.6rem; cursor: pointer; color: var(--ink); }
.drawer-search { max-width: 100%; margin-bottom: 16px; background: var(--paper-2); border: 1px solid var(--line); }
.drawer-search input { color: var(--ink); }
.drawer-search input::placeholder { color: var(--ink-soft); }
.drawer-links { list-style: none; padding: 0; margin: 0; }
.drawer-links li a { display: block; padding: 12px 8px; border-bottom: 1px solid var(--line); color: var(--green); font-weight: 500; }
.drawer-backdrop { position: fixed; inset: 0; background: rgba(0,0,0,0.4); z-index: 70; opacity: 0; pointer-events: none; transition: opacity 0.25s; }
.drawer-backdrop.show { opacity: 1; pointer-events: auto; }

/* ---------- Hero ---------- */
.hero { background: linear-gradient(135deg, var(--green-dark) 0%, var(--green) 100%); color: #fff; padding: 64px 0 56px; text-align: center; }
.hero h1 { font-family: var(--serif); font-size: 2.3rem; margin: 0 0 12px; line-height: 1.2; }
.hero p { color: var(--amber-soft); max-width: 640px; margin: 0 auto 24px; font-size: 1.05rem; }
.hero .searchbox { margin: 0 auto; background: rgba(255,255,255,0.15); }
.hero .searchbox input::placeholder { color: rgba(255,255,255,0.75); }
.hero-chips { margin-top: 18px; display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.hero-chips a { color: #fff; background: rgba(255,255,255,0.1); border: 1px solid rgba(255,255,255,0.25); padding: 5px 12px; border-radius: 999px; font-size: 0.85rem; }
.hero-chips a:hover { background: var(--amber); border-color: var(--amber); }

/* ---------- Sections ---------- */
.section { padding: 48px 0; }
.section-title { font-family: var(--serif); font-size: 1.6rem; color: var(--green); margin: 0 0 6px; }
.section-sub { color: var(--ink-soft); margin: 0 0 28px; }
.section-head { display: flex; justify-content: space-between; align-items: end; margin-bottom: 24px; gap: 16px; flex-wrap: wrap; }
.section-head a.more { font-size: 0.92rem; font-weight: 500; }

/* Card grid */
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 8px; overflow: hidden; display: flex; flex-direction: column; transition: transform 0.15s, box-shadow 0.15s; }
.card:hover { transform: translateY(-3px); box-shadow: 0 8px 24px rgba(31,77,58,0.1); }
.card-img { aspect-ratio: 4/3; background: var(--paper-2); overflow: hidden; }
.card-img img { width: 100%; height: 100%; object-fit: cover; }
.card-body { padding: 16px 18px 20px; flex: 1; display: flex; flex-direction: column; }
.card-cat { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--amber); font-weight: 600; }
.card h3 { font-family: var(--serif); font-size: 1.12rem; margin: 6px 0 8px; line-height: 1.35; }
.card h3 a { color: var(--ink); }
.card h3 a:hover { color: var(--green); }
.card p { color: var(--ink-soft); font-size: 0.92rem; margin: 0; flex: 1; }
.card-meta { margin-top: 12px; font-size: 0.8rem; color: var(--ink-soft); }

/* Topic cards */
.topic-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; }
.topic-card { background: var(--paper-2); border: 1px solid var(--line); border-left: 4px solid var(--amber); padding: 18px 16px; border-radius: 6px; color: var(--ink); }
.topic-card:hover { background: #fff; }
.topic-card h3 { font-family: var(--serif); font-size: 1.02rem; margin: 0 0 4px; color: var(--green); }
.topic-card .count { font-size: 0.82rem; color: var(--ink-soft); }

/* Latest list */
.latest-list { display: grid; grid-template-columns: 1fr 1fr; gap: 14px 32px; }
.latest-item { display: flex; gap: 14px; padding: 12px 0; border-bottom: 1px solid var(--line); }
.latest-item .num { font-family: var(--serif); font-size: 1.6rem; color: var(--amber); min-width: 32px; }
.latest-item h3 { font-size: 1rem; margin: 0 0 4px; font-family: var(--serif); }
.latest-item h3 a { color: var(--ink); }
.latest-item .meta { font-size: 0.8rem; color: var(--ink-soft); }

/* Newsletter */
.newsletter { background: var(--green); color: #fff; padding: 40px 0; }
.newsletter h2 { font-family: var(--serif); margin: 0 0 6px; }
.newsletter p { color: var(--amber-soft); margin: 0 0 18px; }
.newsletter form { display: flex; gap: 10px; max-width: 480px; }
.newsletter input { flex: 1; padding: 11px 14px; border-radius: 6px; border: 1px solid rgba(255,255,255,0.3); background: rgba(255,255,255,0.1); color: #fff; }
.newsletter input::placeholder { color: rgba(255,255,255,0.7); }
.btn { display: inline-block; background: var(--amber); color: #fff; padding: 11px 22px; border-radius: 6px; font-weight: 600; border: 0; cursor: pointer; font-size: 0.95rem; }
.btn:hover { background: #b5772a; color: #fff; }
.btn-outline { background: transparent; border: 2px solid var(--green); color: var(--green); }
.btn-outline:hover { background: var(--green); color: #fff; }

/* Breadcrumb */
.breadcrumb { background: var(--paper-2); border-bottom: 1px solid var(--line); font-size: 0.85rem; }
.breadcrumb .container { padding-top: 10px; padding-bottom: 10px; }
.breadcrumb ol { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; margin: 0; padding: 0; }
.breadcrumb li + li::before { content: "/"; margin-right: 6px; color: var(--ink-soft); }
.breadcrumb a { color: var(--ink-soft); }
.breadcrumb a:hover { color: var(--green); }

/* Article detail */
.guide-layout { display: grid; grid-template-columns: 220px 1fr 280px; gap: 36px; padding: 40px 0; }
.toc { position: sticky; top: 130px; align-self: start; font-size: 0.9rem; }
.toc h4 { font-family: var(--serif); color: var(--green); margin: 0 0 10px; font-size: 1rem; }
.toc ul { list-style: none; padding: 0; margin: 0; border-left: 2px solid var(--line); }
.toc li a { display: block; padding: 6px 12px; color: var(--ink-soft); border-left: 2px solid transparent; margin-left: -2px; }
.toc li a:hover { color: var(--green); border-left-color: var(--amber); }

.article-head h1 { font-family: var(--serif); font-size: 2.1rem; line-height: 1.2; color: var(--green); margin: 0 0 12px; }
.article-head .meta { color: var(--ink-soft); font-size: 0.9rem; margin-bottom: 20px; }
.article-cover { border-radius: 8px; margin-bottom: 28px; border: 1px solid var(--line); width: 100%; height: auto; max-height: 440px; object-fit: cover; object-position: center; }
.article-body h2 { font-family: var(--serif); color: var(--green); font-size: 1.5rem; margin: 36px 0 12px; padding-top: 12px; border-top: 1px solid var(--line); }
.article-body h3 { font-family: var(--serif); color: var(--ink); font-size: 1.18rem; margin: 24px 0 8px; }
.article-body p { margin: 0 0 14px; }
.article-body ul, .article-body ol { margin: 0 0 16px; padding-left: 22px; }
.article-body li { margin-bottom: 6px; }
.article-body table { width: 100%; border-collapse: collapse; margin: 16px 0 22px; font-size: 0.92rem; }
.article-body th, .article-body td { border: 1px solid var(--line); padding: 8px 12px; text-align: left; }
.article-body th { background: var(--paper-2); font-family: var(--serif); }
.article-body blockquote { border-left: 3px solid var(--amber); margin: 18px 0; padding: 8px 18px; background: var(--paper-2); font-style: italic; color: var(--ink-soft); }

/* FAQ accordion */
.faq-block { margin: 40px 0; }
.faq-block h2 { font-family: var(--serif); color: var(--green); font-size: 1.4rem; margin-bottom: 16px; }
.faq-item { border: 1px solid var(--line); border-radius: 6px; margin-bottom: 8px; background: #fff; }
.faq-item summary { cursor: pointer; padding: 14px 16px; font-weight: 600; color: var(--green); list-style: none; position: relative; padding-right: 36px; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; position: absolute; right: 16px; top: 50%; transform: translateY(-50%); font-size: 1.3rem; color: var(--amber); }
.faq-item[open] summary::after { content: "−"; }
.faq-item .faq-a { padding: 0 16px 14px; color: var(--ink-soft); }

/* Sidebar widgets */
.sidebar { position: sticky; top: 130px; align-self: start; }
.widget { background: var(--paper-2); border: 1px solid var(--line); border-radius: 8px; padding: 18px; margin-bottom: 20px; }
.widget h4 { font-family: var(--serif); margin: 0 0 12px; color: var(--green); font-size: 1.05rem; }
.widget a.rel-product { display: block; padding: 10px 0; border-bottom: 1px solid var(--line); }
.widget a.rel-product:last-child { border-bottom: 0; }
.widget a.rel-product .name { color: var(--ink); font-weight: 500; font-size: 0.92rem; }
.widget a.rel-product .price { color: var(--amber); font-weight: 600; font-size: 0.9rem; }

/* Product page */
.product-layout { display: grid; grid-template-columns: 1.1fr 1fr; gap: 40px; padding: 40px 0; }
.product-gallery .main-img { border: 1px solid var(--line); border-radius: 8px; background: #fff; width: 100%; height: auto; max-height: 520px; object-fit: contain; object-position: center; }
.product-gallery .thumbs { display: flex; gap: 10px; margin-top: 12px; }
.product-gallery .thumbs img { width: 80px; height: 80px; object-fit: cover; border: 1px solid var(--line); border-radius: 6px; cursor: pointer; }
.product-info h1 { font-family: var(--serif); color: var(--green); font-size: 1.9rem; margin: 0 0 8px; }
.product-price { font-size: 1.6rem; color: var(--amber); font-weight: 700; margin: 10px 0; }
.product-specs { background: var(--paper-2); border: 1px solid var(--line); border-radius: 8px; padding: 16px 20px; margin: 18px 0; }
.product-specs table { width: 100%; border-collapse: collapse; }
.product-specs td { padding: 6px 0; border-bottom: 1px dashed var(--line); font-size: 0.92rem; }
.product-specs td:first-child { color: var(--ink-soft); width: 40%; }

/* Trust strip */
.trust { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; padding: 36px 0; }
.trust .t { text-align: center; padding: 20px; background: var(--paper-2); border-radius: 8px; border: 1px solid var(--line); }
.trust .t .ic { font-size: 1.8rem; color: var(--amber); }
.trust .t h4 { font-family: var(--serif); margin: 8px 0 4px; color: var(--green); }
.trust .t p { margin: 0; font-size: 0.88rem; color: var(--ink-soft); }

/* About / contact */
.prose { max-width: 760px; }
.prose h2 { font-family: var(--serif); color: var(--green); margin-top: 28px; }
.prose p { margin-bottom: 14px; }

/* Footer */
.site-footer { background: var(--green-dark); color: #d8e3dc; margin-top: 48px; padding: 48px 0 0; font-size: 0.92rem; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 32px; padding-bottom: 32px; }
.site-footer h4 { font-family: var(--serif); color: #fff; margin: 0 0 12px; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: 6px; }
.site-footer a { color: #c8d6ce; }
.site-footer a:hover { color: var(--amber-soft); }
.footer-legal { border-top: 1px solid rgba(255,255,255,0.12); padding: 18px 20px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; font-size: 0.8rem; color: #9fb3a8; }

/* Mobile TOC dropdown */
.toc-mobile { display: none; }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
  .topic-grid { grid-template-columns: repeat(2, 1fr); }
  .guide-layout { grid-template-columns: 1fr; }
  .toc { display: none; }
  .toc-mobile { display: block; margin-bottom: 20px; }
  .toc-mobile summary { cursor: pointer; background: var(--paper-2); border: 1px solid var(--line); padding: 10px 14px; border-radius: 6px; font-weight: 600; color: var(--green); }
  .toc-mobile ul { list-style: none; padding: 8px 0; margin: 0; }
  .toc-mobile li a { display: block; padding: 6px 14px; color: var(--ink-soft); }
  .sidebar { position: static; }
  .product-layout { grid-template-columns: 1fr; }
  .latest-list { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .trust { grid-template-columns: 1fr; }
}
@media (max-width: 680px) {
  .catnav { display: none; }
  .hamburger { display: flex; }
  .searchbox { display: none; }
  .hero h1 { font-size: 1.7rem; }
  .card-grid { grid-template-columns: 1fr; }
  .topic-grid { grid-template-columns: 1fr; }
  .newsletter form { flex-direction: column; }
}