:root{
  --seo-bg: #f5f0e6;
  --seo-surface: #fffaf2;
  --seo-surface-strong: #f1e4cf;
  --seo-text: #1d1a16;
  --seo-muted: #6b6257;
  --seo-line: #d6c5aa;
  --seo-accent: #1d5c46;
  --seo-accent-strong: #144332;
  --seo-board-light: #f3dfb2;
  --seo-board-dark: #ab7b4d;
}

*{
  box-sizing: border-box;
}

body{
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(29, 92, 70, 0.12), transparent 28rem),
    linear-gradient(180deg, #fbf7ef 0%, var(--seo-bg) 100%);
  color: var(--seo-text);
  font: 16px/1.6 Georgia, "Times New Roman", serif;
}

a{
  color: var(--seo-accent);
}

.seoShell{
  width: min(1100px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 1.5rem 0 3rem;
}

.seoHero{
  display: grid;
  grid-template-columns: minmax(260px, 360px) 1fr;
  gap: 1.5rem;
  align-items: start;
  margin-bottom: 1.5rem;
}

.seoHeroWide{
  max-width: 52rem;
}

.seoHeroBody,
.seoCard,
.seoSection{
  background: rgba(255, 250, 242, 0.92);
  border: 1px solid var(--seo-line);
  border-radius: 1.25rem;
  padding: 1.25rem;
  box-shadow: 0 14px 40px rgba(71, 48, 27, 0.08);
}

.seoHeroBoard{
  background: rgba(255, 250, 242, 0.92);
  border: 1px solid var(--seo-line);
  border-radius: 1.25rem;
  padding: 1rem;
  box-shadow: 0 14px 40px rgba(71, 48, 27, 0.08);
}

.seoEyebrow,
.seoCardMeta{
  margin: 0 0 0.5rem;
  color: var(--seo-muted);
  font: 600 0.82rem/1.2 "Trebuchet MS", Verdana, sans-serif;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2{
  margin: 0 0 0.75rem;
  line-height: 1.15;
}

h1{
  font-size: clamp(2.1rem, 4vw, 3.4rem);
}

h2{
  font-size: clamp(1.35rem, 2vw, 1.7rem);
}

.seoLead{
  margin: 0 0 1rem;
  color: var(--seo-muted);
  font-size: 1.05rem;
}

.seoPoints,
.seoLinkList,
.seoInlineLinks{
  margin: 0;
  padding-left: 1.2rem;
}

.seoInlineLinks{
  display: grid;
  gap: 0.25rem;
  margin-bottom: 1rem;
}

.seoLinkList{
  display: grid;
  gap: 0.45rem;
}

.seoSection{
  margin-bottom: 1rem;
}

.seoPrimaryBtn,
.seoSecondaryBtn,
.seoFooterLink{
  display: inline-block;
  padding: 0.8rem 1.05rem;
  border-radius: 999px;
  text-decoration: none;
  font: 600 0.95rem/1.2 "Trebuchet MS", Verdana, sans-serif;
}

.seoPrimaryBtn,
.seoFooterLink{
  background: var(--seo-accent);
  color: #fffaf2;
}

.seoPrimaryBtn:hover,
.seoFooterLink:hover{
  background: var(--seo-accent-strong);
}

.seoSecondaryBtn{
  border: 1px solid var(--seo-line);
  color: var(--seo-text);
  background: transparent;
}

.seoMoves{
  margin: 0;
  font-family: "Courier New", monospace;
  background: var(--seo-surface-strong);
  border-radius: 0.9rem;
  padding: 0.9rem 1rem;
  overflow-x: auto;
}

.seoBreadcrumbs{
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 1rem;
  color: var(--seo-muted);
  font: 600 0.92rem/1.2 "Trebuchet MS", Verdana, sans-serif;
}

.seoCrumbSep{
  opacity: 0.65;
}

.seoClusterGrid{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
}

.seoBoard{
  display: grid;
  border: 1px solid var(--seo-line);
  border-radius: 0.8rem;
  overflow: hidden;
}

.seoBoardRow{
  display: grid;
  grid-template-columns: repeat(8, 1fr);
}

.seoSquare{
  aspect-ratio: 1 / 1;
  display: grid;
  place-items: center;
}

.seoSquare.isLight{
  background: var(--seo-board-light);
}

.seoSquare.isDark{
  background: var(--seo-board-dark);
}

.seoPiece{
  font-size: clamp(1.1rem, 2vw, 1.7rem);
}

.seoFooter{
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--seo-line);
  color: var(--seo-muted);
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
}

.seoFooterMeta{
  flex: 1 1 22rem;
}

.seoFooterMeta p{
  margin: 0;
}

.seoFooterContact{
  margin-top: 0.5rem !important;
}

.seoFooterMail{
  color: var(--seo-accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(29, 92, 70, 0.25);
}

.seoFooterMail:hover{
  border-bottom-color: rgba(20, 67, 50, 0.45);
}

.seoTrainShell{
  min-height: 100vh;
  display: grid;
  place-items: center;
}

.seoTrainStack{
  width: min(42rem, 100%);
}

@media (max-width: 860px){
  .seoHero{
    grid-template-columns: 1fr;
  }
}