/* Artha Learn — shared article styles (static SEO pages, no JS framework) */
* { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg: #07080f;
  --card: #12141f;
  --card-border: #232738;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --faint: #64748b;
  --blue: #3b82f6;
  --violet: #8b5cf6;
  --green: #34d399;
  --red: #f87171;
  --amber: #fbbf24;
}
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

.site-header {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 760px; margin: 0 auto; padding: 1rem 1.25rem;
}
.wordmark {
  font-size: 1.3rem; font-weight: 800; letter-spacing: -0.03em;
  background: linear-gradient(125deg, #3b82f6, #8b5cf6);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.site-header nav a { color: var(--muted); font-size: 0.85rem; margin-left: 1rem; }

main { max-width: 760px; margin: 0 auto; padding: 0.5rem 1.25rem 3rem; }
.breadcrumb { font-size: 0.78rem; color: var(--faint); margin: 0.5rem 0 1.5rem; }
.breadcrumb a { color: var(--faint); }

article h1 {
  font-size: clamp(1.6rem, 5vw, 2.2rem); font-weight: 800;
  letter-spacing: -0.02em; line-height: 1.25; margin-bottom: 0.6rem;
}
.byline { font-size: 0.8rem; color: var(--faint); margin-bottom: 2rem; }
article h2 { font-size: 1.35rem; font-weight: 700; margin: 2.2rem 0 0.8rem; letter-spacing: -0.01em; }
article h3 { font-size: 1.05rem; font-weight: 700; margin: 1.6rem 0 0.5rem; }
article p { margin-bottom: 1.05rem; color: var(--text); }
article ul, article ol { margin: 0 0 1.05rem 1.4rem; }
article li { margin-bottom: 0.45rem; }
article strong { color: #fff; }

.lead { font-size: 1.08rem; color: var(--muted); }

table { width: 100%; border-collapse: collapse; margin: 1.2rem 0; font-size: 0.9rem; display: block; overflow-x: auto; }
th, td { text-align: left; padding: 0.55rem 0.75rem; border-bottom: 1px solid var(--card-border); white-space: nowrap; }
th { color: var(--muted); font-weight: 600; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.04em; }

.callout {
  background: var(--card); border: 1px solid var(--card-border);
  border-left: 3px solid var(--blue); border-radius: 12px;
  padding: 1rem 1.2rem; margin: 1.4rem 0; font-size: 0.95rem;
}
.callout.warn { border-left-color: var(--amber); }
.callout .label { font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: var(--faint); display: block; margin-bottom: 0.3rem; }

.cta {
  background: linear-gradient(135deg, rgba(59,130,246,0.12), rgba(139,92,246,0.12));
  border: 1px solid rgba(59,130,246,0.35); border-radius: 16px;
  padding: 1.5rem; margin: 2.5rem 0 1rem; text-align: center;
}
.cta h2 { margin: 0 0 0.5rem; font-size: 1.2rem; }
.cta p { color: var(--muted); font-size: 0.92rem; margin-bottom: 1rem; }
.cta .btn {
  display: inline-block; background: linear-gradient(125deg, #3b82f6, #8b5cf6);
  color: #fff; font-weight: 700; padding: 0.7rem 1.6rem; border-radius: 12px; font-size: 0.95rem;
}
.cta .btn:hover { text-decoration: none; opacity: 0.92; }
.cta .sub { font-size: 0.75rem; color: var(--faint); margin: 0.7rem 0 0; }

.related { margin-top: 2.5rem; }
.related h2 { font-size: 1rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.05em; }
.related ul { list-style: none; margin: 0.8rem 0 0; }
.related li { margin-bottom: 0.55rem; }

.article-list { list-style: none; margin: 0; }
.article-list li {
  background: var(--card); border: 1px solid var(--card-border); border-radius: 14px;
  padding: 1.1rem 1.3rem; margin-bottom: 0.9rem;
}
.article-list li a { font-weight: 700; font-size: 1.02rem; color: var(--text); }
.article-list li a:hover { color: var(--blue); }
.article-list li p { font-size: 0.86rem; color: var(--muted); margin: 0.3rem 0 0; }

.site-footer {
  max-width: 760px; margin: 0 auto; padding: 1.5rem 1.25rem 3rem;
  border-top: 1px solid var(--card-border);
  font-size: 0.75rem; color: var(--faint); line-height: 1.7;
}
.site-footer a { color: var(--muted); }

/* Calculator */
.calc {
  background: var(--card); border: 1px solid var(--card-border); border-radius: 16px;
  padding: 1.5rem; margin: 1.5rem 0;
}
.calc label { display: block; font-size: 0.8rem; color: var(--muted); font-weight: 600; margin: 1rem 0 0.3rem; }
.calc label:first-of-type { margin-top: 0; }
.calc input {
  width: 100%; background: var(--bg); border: 1px solid var(--card-border);
  border-radius: 10px; padding: 0.7rem 0.9rem; color: var(--text);
  font-size: 1.05rem; font-family: "IBM Plex Mono", ui-monospace, monospace;
}
.calc input:focus { outline: none; border-color: var(--blue); }
.calc .results { margin-top: 1.4rem; border-top: 1px solid var(--card-border); padding-top: 1.2rem; }
.calc .row { display: flex; justify-content: space-between; align-items: baseline; padding: 0.4rem 0; font-size: 0.95rem; }
.calc .row .k { color: var(--muted); font-size: 0.85rem; }
.calc .row .v { font-family: "IBM Plex Mono", ui-monospace, monospace; font-weight: 600; }
.calc .row .v.big { font-size: 1.5rem; color: var(--green); }
.calc .row .v.risk { color: var(--red); }