/* Word Labyrinth — shared stylesheet for static SEO landing pages.
 * Dark by default with a light-mode override (matches the app palette).
 * Loaded by all pages under /word-ladder/, /how-to-play/, /faq/, /about/, /blog/. */

:root {
  --bg: #0d1117;
  --bg-elev: #161b22;
  --bg-card: #1a1f2a;
  --border: #30363d;
  --text: #f0f6fc;
  --muted: #a3a8b8;
  --primary: #7c3aed;
  --primary-hover: #6d28d9;
  --accent: #a855f7;
  --code-bg: #161b22;
  --link: #a78bfa;
  --link-hover: #c4b5fd;
  --max-width: 860px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f8f9fa;
    --bg-elev: #ffffff;
    --bg-card: #ffffff;
    --border: #dee2e6;
    --text: #212529;
    --muted: #5a6470;
    --primary: #6d28d9;
    --primary-hover: #5b21b6;
    --accent: #7c3aed;
    --code-bg: #f0f1f4;
    --link: #6d28d9;
    --link-hover: #5b21b6;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--link); text-decoration: none; }
a:hover { color: var(--link-hover); text-decoration: underline; }

h1, h2, h3, h4 {
  line-height: 1.25;
  margin: 1.6em 0 0.6em;
  letter-spacing: -0.01em;
}
h1 { font-size: 2.2rem; margin-top: 0.4em; }
h2 { font-size: 1.55rem; border-bottom: 1px solid var(--border); padding-bottom: 0.3rem; }
h3 { font-size: 1.2rem; }
p { margin: 0.9em 0; }

ul, ol { padding-left: 1.4em; }
li { margin: 0.35em 0; }

code {
  background: var(--code-bg);
  padding: 0.12em 0.4em;
  border-radius: 4px;
  font-size: 0.92em;
  font-family: "SF Mono", Menlo, Consolas, monospace;
}
pre {
  background: var(--code-bg);
  padding: 14px 18px;
  border-radius: 8px;
  overflow-x: auto;
  border: 1px solid var(--border);
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.95rem;
  line-height: 1.7;
}
pre code { background: transparent; padding: 0; }

blockquote {
  margin: 1.2em 0;
  padding: 0.4em 1em;
  border-left: 3px solid var(--primary);
  background: var(--bg-elev);
  color: var(--muted);
  border-radius: 0 6px 6px 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1em 0;
  font-size: 0.95rem;
}
th, td {
  border: 1px solid var(--border);
  padding: 8px 12px;
  text-align: left;
  vertical-align: top;
}
th { background: var(--bg-elev); font-weight: 600; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* Header / nav */
.site-header {
  border-bottom: 1px solid var(--border);
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
}
@media (prefers-color-scheme: light) {
  .site-header { background: rgba(248, 249, 250, 0.85); }
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  padding-bottom: 14px;
  flex-wrap: wrap;
  gap: 12px;
}
.brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
}
.brand:hover { color: var(--text); text-decoration: none; }
.brand .accent { color: var(--primary); }

.site-nav {
  display: flex;
  gap: 18px;
  align-items: center;
  flex-wrap: wrap;
}
.site-nav a {
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 500;
}
.site-nav a:hover { color: var(--text); text-decoration: none; }
.site-nav a.cta {
  background: var(--primary);
  color: #fff;
  padding: 7px 14px;
  border-radius: 6px;
  font-weight: 600;
}
.site-nav a.cta:hover { background: var(--primary-hover); color: #fff; }

/* Main content */
main.container { padding-top: 32px; padding-bottom: 80px; }

.lead {
  font-size: 1.18rem;
  color: var(--muted);
  margin: 0.4em 0 1.4em;
}

.cta-block {
  margin: 2.2em 0;
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--bg-elev);
  text-align: center;
}
.cta-block h3 { margin-top: 0; }
.btn-primary {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  padding: 12px 28px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
}
.btn-primary:hover { background: var(--primary-hover); color: #fff; text-decoration: none; }

/* Breadcrumbs */
.breadcrumbs {
  font-size: 0.9rem;
  color: var(--muted);
  margin: 0 0 1em;
}
.breadcrumbs a { color: var(--muted); }
.breadcrumbs a:hover { color: var(--text); }
.breadcrumbs .sep { margin: 0 0.4em; opacity: 0.5; }

/* Card grid (used on blog index) */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 18px;
  margin: 1.6em 0;
}
.card {
  border: 1px solid var(--border);
  background: var(--bg-card);
  border-radius: 10px;
  padding: 18px 20px;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.card:hover { border-color: var(--primary); transform: translateY(-2px); }
.card h3 { margin: 0 0 0.4em; font-size: 1.1rem; }
.card h3 a { color: var(--text); }
.card p { margin: 0; color: var(--muted); font-size: 0.95rem; }
.card .read-more {
  display: inline-block;
  margin-top: 0.8em;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--link);
}

/* FAQ list */
.faq-list { margin: 1.4em 0; }
.faq-item {
  border-top: 1px solid var(--border);
  padding: 1.2em 0;
}
.faq-item:last-child { border-bottom: 1px solid var(--border); }
.faq-item h3 { margin: 0 0 0.5em; font-size: 1.08rem; }
.faq-item p { margin: 0; color: var(--text); }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 60px;
  padding: 28px 0;
  font-size: 0.92rem;
  color: var(--muted);
}
.site-footer .container {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--text); }
.site-footer ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

/* Word ladder example formatting */
.ladder {
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  color: var(--text);
}
.ladder .arrow { color: var(--primary); margin: 0 0.4em; }

/* Mobile */
@media (max-width: 640px) {
  body { font-size: 16px; }
  h1 { font-size: 1.7rem; }
  h2 { font-size: 1.3rem; }
  .site-header .container { padding-top: 12px; padding-bottom: 12px; }
  .site-nav { gap: 12px; font-size: 0.9rem; }
  .site-nav a.cta { padding: 6px 12px; }
  main.container { padding-top: 22px; }
  table { font-size: 0.88rem; }
  th, td { padding: 6px 8px; }
  pre { font-size: 0.88rem; padding: 12px; }
}