/* Shared styling for ChessAlive static content pages (guides, about, legal).
   These are real, crawlable HTML pages — the publisher content layer that sits
   alongside the app. Keep them fast, readable, and self-contained. */
:root {
  --ink: #0f2236;
  --ink-soft: #41566b;
  --muted: #6b7f93;
  --line: #dce6f0;
  --bg: #f6f9fc;
  --card: #ffffff;
  --brand: #2563eb;
  --brand-dark: #1d4ed8;
  --gold: #c9962f;
  --maxw: 760px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 18px;
  line-height: 1.7;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; }

.site-header {
  position: sticky; top: 0; z-index: 10;
  background: rgba(255,255,255,0.92);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap {
  max-width: 1040px; margin: 0 auto; padding: 14px 20px;
  display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 20px; color: var(--ink); }
.brand .mark {
  width: 30px; height: 30px; border-radius: 8px; display: grid; place-items: center;
  background: linear-gradient(135deg, #1e293b, #334155); color: #facc15; font-size: 18px;
}
.site-nav { display: flex; gap: 18px; margin-left: auto; flex-wrap: wrap; }
.site-nav a { color: var(--ink-soft); font-weight: 600; font-size: 15px; }
.site-nav a.cta {
  background: var(--brand); color: #fff; padding: 7px 14px; border-radius: 999px;
}
.site-nav a.cta:hover { background: var(--brand-dark); text-decoration: none; }

main { max-width: var(--maxw); margin: 0 auto; padding: 28px 20px 64px; }
.crumbs { font-size: 14px; color: var(--muted); margin: 6px 0 18px; }
h1 { font-size: 2.1rem; line-height: 1.2; letter-spacing: -0.02em; margin: 8px 0 6px; }
.lede { font-size: 1.18rem; color: var(--ink-soft); margin: 0 0 8px; }
h2 { font-size: 1.5rem; margin: 2em 0 0.4em; letter-spacing: -0.01em; }
h3 { font-size: 1.2rem; margin: 1.6em 0 0.3em; }
p, ul, ol { margin: 0.7em 0; }
li { margin: 0.35em 0; }
strong { color: var(--ink); }
hr { border: none; border-top: 1px solid var(--line); margin: 2.4em 0; }
blockquote {
  margin: 1.4em 0; padding: 12px 18px; border-left: 4px solid var(--gold);
  background: #fffdf5; color: var(--ink-soft); border-radius: 0 10px 10px 0;
}
code, .move { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; background: #eef3f9; padding: 1px 6px; border-radius: 5px; font-size: 0.92em; }

.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; margin: 22px 0; }
.guide-card {
  display: block; background: var(--card); border: 1px solid var(--line); border-radius: 14px;
  padding: 18px; color: var(--ink); transition: transform .12s ease, box-shadow .12s ease;
}
.guide-card:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(15,34,54,0.08); text-decoration: none; }
.guide-card .kicker { font-size: 12px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; color: var(--brand); }
.guide-card h3 { margin: 6px 0 4px; font-size: 1.12rem; }
.guide-card p { margin: 0; color: var(--ink-soft); font-size: 0.96rem; }

.next-prev { display: flex; justify-content: space-between; gap: 12px; margin-top: 36px; flex-wrap: wrap; }
.next-prev a { font-weight: 700; }

.site-footer { border-top: 1px solid var(--line); background: #fff; }
.site-footer .wrap { max-width: 1040px; margin: 0 auto; padding: 28px 20px; color: var(--muted); font-size: 14px; }
.site-footer .links { display: flex; gap: 18px; flex-wrap: wrap; margin-bottom: 12px; }
.site-footer .links a { color: var(--ink-soft); font-weight: 600; }
.app-cta {
  background: linear-gradient(135deg, #0f172a, #1e293b); color: #e2e8f0; border-radius: 16px;
  padding: 24px; margin: 32px 0; text-align: center;
}
.app-cta h2 { color: #fff; margin: 0 0 6px; }
.app-cta p { color: #94a3b8; margin: 0 0 14px; }
.app-cta a.button {
  display: inline-block; background: #facc15; color: #0f172a; font-weight: 800;
  padding: 11px 22px; border-radius: 999px;
}
.app-cta a.button:hover { text-decoration: none; filter: brightness(1.05); }

/* Author bylines + author pages (real bylines = E-E-A-T) */
.byline { display: flex; align-items: center; gap: 12px; margin: 16px 0 8px; padding: 12px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.byline-avatar { width: 44px; height: 44px; border-radius: 999px; object-fit: cover; background: var(--line); flex: none; }
.byline-meta { display: flex; flex-direction: column; line-height: 1.45; }
.byline-by { font-weight: 700; color: var(--ink); font-size: 0.95rem; }
.byline-by a { color: var(--ink); }
.byline-sub { color: var(--muted); font-size: 0.84rem; }
.author-head { display: flex; align-items: center; gap: 18px; margin: 10px 0 6px; flex-wrap: wrap; }
.author-photo { width: 104px; height: 104px; border-radius: 999px; object-fit: cover; background: var(--line); flex: none; box-shadow: 0 6px 18px rgba(15,34,54,0.10); }
.author-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; margin: 22px 0; }
.author-card { display: flex; gap: 14px; align-items: center; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 16px; color: var(--ink); }
.author-card:hover { text-decoration: none; box-shadow: 0 10px 24px rgba(15,34,54,0.08); }
.author-card img { width: 66px; height: 66px; border-radius: 999px; object-fit: cover; background: var(--line); flex: none; }
.author-card h3 { margin: 0 0 2px; font-size: 1.05rem; }
.author-card p { margin: 0; color: var(--ink-soft); font-size: 0.9rem; }

@media (max-width: 520px) { body { font-size: 17px; } h1 { font-size: 1.7rem; } }