/* ==========================================================================
   Chess Set Station — Global Stylesheet
   Chess-inspired, premium, mobile-first, accessible.
   ========================================================================== */

:root {
  /* Palette: ivory/charcoal board with a warm gold accent */
  --color-ink: #1b1a17;
  --color-charcoal: #24231f;
  --color-charcoal-soft: #322f29;
  --color-ivory: #faf7f0;
  --color-ivory-dim: #efe9db;
  --color-board-light: #f1ead9;
  --color-board-dark: #3c3a34;
  --color-gold: #b3862c;
  --color-gold-bright: #d4a13a;
  --color-line: #ddd4bf;
  --color-line-dark: #45423b;
  --color-text: #2a2823;
  --color-text-soft: #57534a;
  --color-text-on-dark: #f4efe2;
  --color-text-on-dark-soft: #c9c2ae;
  --color-success: #2f6d4a;
  --color-focus: #1e6fd9;

  --font-serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  --shadow-sm: 0 1px 3px rgba(27, 26, 23, 0.08);
  --shadow-md: 0 6px 20px rgba(27, 26, 23, 0.10);
  --shadow-lg: 0 16px 40px rgba(27, 26, 23, 0.16);

  --container-max: 1200px;
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 4.5rem;

  --transition-fast: 150ms ease;
  --transition-med: 260ms cubic-bezier(0.22, 0.61, 0.36, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-text: var(--color-text-on-dark);
    --color-text-soft: var(--color-text-on-dark-soft);
  }
}

/* -------------------------------------------------------------------------
   Reset
   ------------------------------------------------------------------------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-ivory);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img, picture, svg { max-width: 100%; display: block; }
a { color: inherit; }
ul, ol { padding-left: 1.25em; }
h1, h2, h3, h4 { font-family: var(--font-serif); line-height: 1.2; color: var(--color-ink); }
p { margin: 0 0 1em; }

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: 2px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-ink);
  color: var(--color-ivory);
  padding: 0.75em 1.25em;
  z-index: 1000;
  border-radius: 0 0 var(--radius-sm) 0;
}
.skip-link:focus {
  left: 0;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* -------------------------------------------------------------------------
   Site header
   ------------------------------------------------------------------------- */
.site-header {
  background: var(--color-ink);
  color: var(--color-text-on-dark);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--color-line-dark);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-2);
  gap: var(--space-3);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6em;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text-on-dark);
  text-decoration: none;
  white-space: nowrap;
}

.brand-mark {
  width: 34px;
  height: 34px;
  flex-shrink: 0;
}

.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--color-line-dark);
  color: var(--color-text-on-dark);
  border-radius: var(--radius-sm);
  padding: 0.5em 0.7em;
  cursor: pointer;
  font-size: 1rem;
}

.main-nav {
  display: flex;
}

.main-nav ul {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: var(--space-3);
}

.main-nav a {
  text-decoration: none;
  color: var(--color-text-on-dark-soft);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.4em 0.1em;
  border-bottom: 2px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.main-nav a:hover,
.main-nav a[aria-current="page"] {
  color: var(--color-gold-bright);
  border-bottom-color: var(--color-gold-bright);
}

@media (max-width: 860px) {
  .nav-toggle { display: inline-flex; align-items: center; gap: 0.4em; }
  .main-nav {
    display: none;
    position: absolute;
    inset-inline: 0;
    top: 100%;
    background: var(--color-ink);
    border-bottom: 1px solid var(--color-line-dark);
    padding: var(--space-2) var(--space-3) var(--space-3);
  }
  .main-nav.is-open { display: block; }
  .main-nav ul { flex-direction: column; gap: var(--space-2); }
}

/* -------------------------------------------------------------------------
   Hero
   ------------------------------------------------------------------------- */
.hero {
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(179, 134, 44, 0.18), transparent 60%),
    linear-gradient(180deg, var(--color-ink) 0%, var(--color-charcoal) 100%);
  color: var(--color-text-on-dark);
  padding-block: var(--space-6) var(--space-5);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--space-5);
  align-items: center;
}

@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; }
}

.eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-gold-bright);
  font-weight: 700;
  margin-bottom: var(--space-2);
}

.hero h1 {
  color: var(--color-text-on-dark);
  font-size: clamp(2.1rem, 4vw, 3.2rem);
  margin: 0 0 var(--space-2);
}

.hero p.lede {
  color: var(--color-text-on-dark-soft);
  font-size: 1.15rem;
  max-width: 46ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.hero-art {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-line-dark);
  aspect-ratio: 4 / 3;
  max-height: 420px;
}

.hero-art img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* -------------------------------------------------------------------------
   Buttons
   ------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  padding: 0.85em 1.4em;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--transition-fast), background var(--transition-fast), box-shadow var(--transition-fast);
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--color-gold);
  color: var(--color-ink);
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover { background: var(--color-gold-bright); box-shadow: var(--shadow-md); }

.btn-ghost {
  background: transparent;
  color: var(--color-text-on-dark);
  border-color: var(--color-line-dark);
}
.btn-ghost:hover { border-color: var(--color-gold-bright); color: var(--color-gold-bright); }

.btn-outline {
  background: transparent;
  color: var(--color-ink);
  border-color: var(--color-line);
}
.btn-outline:hover { border-color: var(--color-gold); color: var(--color-gold); }

.btn-block { width: 100%; justify-content: center; }
.btn-sm { padding: 0.6em 1em; font-size: 0.85rem; }

/* -------------------------------------------------------------------------
   Sections & headings
   ------------------------------------------------------------------------- */
.section { padding-block: var(--space-5); }
.section-alt { background: var(--color-ivory-dim); }
.section-dark { background: var(--color-charcoal); color: var(--color-text-on-dark); }
.section-dark h2, .section-dark h3 { color: var(--color-text-on-dark); }

.section-head {
  max-width: 62ch;
  margin-bottom: var(--space-4);
}

.section-head h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  margin: 0 0 0.4em;
}

.section-head p { color: var(--color-text-soft); margin: 0; }

.section-foot {
  margin-top: var(--space-4);
  text-align: center;
}

/* -------------------------------------------------------------------------
   Category grid / nav cards
   ------------------------------------------------------------------------- */
.grid {
  display: grid;
  gap: var(--space-3);
}

.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

@media (max-width: 980px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 620px) {
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
}

.category-card {
  display: flex;
  flex-direction: column;
  gap: 0.6em;
  background: #fff;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-med), box-shadow var(--transition-med), border-color var(--transition-med);
}
.category-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-gold);
}
.category-card .icon { width: 40px; height: 40px; color: var(--color-gold); }
.category-card h3 { margin: 0; font-size: 1.1rem; }
.category-card p { margin: 0; color: var(--color-text-soft); font-size: 0.92rem; }

/* -------------------------------------------------------------------------
   Product cards (data-driven, rendered by JS from products-data.js)
   ------------------------------------------------------------------------- */
.product-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-3);
}
@media (max-width: 1024px) { .product-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 760px) { .product-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .product-grid { grid-template-columns: 1fr; } }

.product-card {
  background: #fff;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-med), box-shadow var(--transition-med);
}
.product-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }

.product-card .thumb-link {
  display: block;
  aspect-ratio: 4 / 3;
  background: var(--color-board-light);
  overflow: hidden;
}
.product-card .thumb-link img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform var(--transition-med);
}
.product-card:hover .thumb-link img { transform: scale(1.04); }

.product-card .card-body {
  padding: var(--space-2) var(--space-3) var(--space-3);
  display: flex;
  flex-direction: column;
  gap: 0.5em;
  flex: 1;
}

.product-card .badge {
  align-self: flex-start;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 700;
  color: var(--color-gold);
  background: rgba(179, 134, 44, 0.12);
  padding: 0.25em 0.6em;
  border-radius: 999px;
}

.product-card h3 { font-size: 1rem; margin: 0; }
.product-card h3 a { text-decoration: none; color: var(--color-ink); }
.product-card h3 a:hover { color: var(--color-gold); }

.product-card p.desc { color: var(--color-text-soft); font-size: 0.88rem; margin: 0; flex: 1; }

.product-card .card-cta { margin-top: 0.4em; }

.editorial-note {
  font-size: 0.72rem;
  color: var(--color-text-soft);
  font-style: italic;
}

/* -------------------------------------------------------------------------
   Methodology / steps
   ------------------------------------------------------------------------- */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-3);
  counter-reset: step;
}
@media (max-width: 900px) { .steps { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .steps { grid-template-columns: 1fr; } }

.step {
  background: rgba(250, 247, 240, 0.04);
  border: 1px solid var(--color-line-dark);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  position: relative;
}
.section:not(.section-dark) .step {
  background: #fff;
  border-color: var(--color-line);
}
.step::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  font-family: var(--font-serif);
  color: var(--color-gold);
  font-size: 1.4rem;
  font-weight: 700;
  display: block;
  margin-bottom: 0.4em;
}

/* -------------------------------------------------------------------------
   Article / guide content
   ------------------------------------------------------------------------- */
.breadcrumbs {
  font-size: 0.85rem;
  color: var(--color-text-soft);
  margin-bottom: var(--space-2);
}
.breadcrumbs ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4em;
  padding: 0;
  margin: 0;
}
.breadcrumbs li:not(:last-child)::after { content: "›"; margin-left: 0.4em; color: var(--color-text-soft); }
.breadcrumbs a { text-decoration: none; color: var(--color-text-soft); }
.breadcrumbs a:hover { color: var(--color-gold); text-decoration: underline; }
.breadcrumbs [aria-current="page"] { color: var(--color-text); font-weight: 600; }

.article-header { padding-block: var(--space-4) var(--space-3); }
.article-header h1 { font-size: clamp(1.8rem, 3.4vw, 2.6rem); margin: 0.2em 0 0.4em; }

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6em 1.2em;
  font-size: 0.85rem;
  color: var(--color-text-soft);
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  padding-block: 0.8em;
  margin-block: var(--space-2);
}

.article-layout {
  display: grid;
  grid-template-columns: 2.2fr 1fr;
  gap: var(--space-5);
  align-items: start;
}
@media (max-width: 900px) { .article-layout { grid-template-columns: 1fr; } }

.toc {
  background: var(--color-ivory-dim);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  position: sticky;
  top: 90px;
}
.toc h2 { font-size: 1rem; margin: 0 0 0.6em; }
.toc ol { margin: 0; padding-left: 1.1em; font-size: 0.9rem; }
.toc a { text-decoration: none; color: var(--color-text-soft); }
.toc a:hover { color: var(--color-gold); text-decoration: underline; }

.prose { max-width: 72ch; }
.prose h2 { font-size: 1.5rem; margin-top: 1.8em; }
.prose h3 { font-size: 1.15rem; margin-top: 1.4em; }
.prose ul, .prose ol { margin: 0 0 1em; }
.prose li { margin-bottom: 0.4em; }
.prose blockquote {
  margin: 1.5em 0;
  padding: 0.8em 1.2em;
  border-left: 3px solid var(--color-gold);
  background: var(--color-ivory-dim);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.callout {
  background: #fff;
  border: 1px solid var(--color-line);
  border-left: 4px solid var(--color-gold);
  border-radius: var(--radius-sm);
  padding: var(--space-3);
  margin: var(--space-3) 0;
}
.callout p:last-child { margin-bottom: 0; }

.affiliate-cta-box {
  background: var(--color-ink);
  color: var(--color-text-on-dark);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  margin: var(--space-4) 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}
.affiliate-cta-box p { margin: 0; color: var(--color-text-on-dark-soft); }
.affiliate-cta-box strong { color: var(--color-text-on-dark); }

.faq dt {
  font-weight: 700;
  margin-top: 1.2em;
  color: var(--color-ink);
}
.faq dd { margin: 0.3em 0 0; color: var(--color-text-soft); }

.related-links {
  margin-top: var(--space-5);
  border-top: 1px solid var(--color-line);
  padding-top: var(--space-3);
}
.related-links ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.6em; }
.related-links a {
  text-decoration: none;
  color: var(--color-ink);
  font-weight: 600;
  display: inline-block;
  border-bottom: 1px solid transparent;
}
.related-links a:hover { color: var(--color-gold); border-bottom-color: var(--color-gold); }

/* -------------------------------------------------------------------------
   Guide index cards
   ------------------------------------------------------------------------- */
.guide-card {
  background: #fff;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
  display: flex;
  flex-direction: column;
  gap: 0.5em;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-med), box-shadow var(--transition-med);
}
.guide-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.guide-card h3 { margin: 0; font-size: 1.1rem; color: var(--color-ink); }
.guide-card .guide-excerpt { color: var(--color-text-soft); font-size: 0.9rem; margin: 0; }
.guide-card .guide-date { font-size: 0.75rem; color: var(--color-text-soft); }


/* -------------------------------------------------------------------------
   Forms
   ------------------------------------------------------------------------- */
.form-field { margin-bottom: var(--space-2); }
.form-field label { display: block; font-weight: 600; margin-bottom: 0.3em; font-size: 0.9rem; }
.form-field input, .form-field textarea {
  width: 100%;
  padding: 0.7em 0.9em;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  font: inherit;
  background: #fff;
  color: var(--color-text);
}
.form-field input:focus, .form-field textarea:focus { border-color: var(--color-gold); }

/* -------------------------------------------------------------------------
   Footer
   ------------------------------------------------------------------------- */
.site-footer {
  background: var(--color-ink);
  color: var(--color-text-on-dark-soft);
  padding-block: var(--space-5) var(--space-4);
  margin-top: var(--space-6);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: var(--space-4);
}
@media (max-width: 780px) { .footer-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .footer-grid { grid-template-columns: 1fr; } }

.footer-grid h4 {
  color: var(--color-text-on-dark);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 0 0 0.8em;
}
.footer-grid ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.5em; }
.footer-grid a { color: var(--color-text-on-dark-soft); text-decoration: none; font-size: 0.9rem; }
.footer-grid a:hover { color: var(--color-gold-bright); }
.footer-brand p { color: var(--color-text-on-dark-soft); font-size: 0.88rem; max-width: 32ch; }

.footer-bottom {
  border-top: 1px solid var(--color-line-dark);
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  font-size: 0.8rem;
}
.footer-disclosure {
  margin: 0 0 var(--space-2);
  color: var(--color-text-on-dark);
  font-size: 0.9rem;
  font-weight: 500;
}
.footer-disclosure a {
  color: var(--color-gold-bright);
  text-decoration: underline;
  font-weight: 700;
}
.footer-disclosure a:hover { color: var(--color-ivory); }
.footer-bottom-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-2);
}

/* -------------------------------------------------------------------------
   404 page
   ------------------------------------------------------------------------- */
.error-page {
  min-height: 60vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-6) var(--space-3);
}
.error-page .error-code {
  font-family: var(--font-serif);
  font-size: 5rem;
  color: var(--color-gold);
  margin: 0;
}

/* -------------------------------------------------------------------------
   Utilities
   ------------------------------------------------------------------------- */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.na-note { font-size: 0.78rem; color: var(--color-text-soft); }