/* Red-Green Software — brand layer for W3.CSS
   Load after w3.css. Everything here is prefixed rg- so W3 classes stay untouched. */

:root {
  --rg-ground: #F4F1EA;   /* cream */
  --rg-surface: #FFFFFF;
  --rg-ink: #15171A;
  --rg-text: #15171A;
  --rg-muted: #5B5F66;
  --rg-line: #DDD8CC;
  --rg-red: #B3261E;      /* wordmark red (on light) */
  --rg-green: #1A7F37;    /* wordmark green (on light) */
  --rg-red-bright: #E5484D;   /* mark red (on dark) */
  --rg-green-bright: #3FB950; /* mark green (on dark) */
  --rg-red-wash: #F7E3E1;
  --rg-green-wash: #E2F1E5;
  --rg-sans: "Sora", system-ui, -apple-system, "Segoe UI", sans-serif;
  --rg-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --rg-ground: #15171A;
    --rg-surface: #1E2125;
    --rg-text: #F4F1EA;
    --rg-muted: #A3A7AD;
    --rg-line: #2E3237;
    --rg-red: #E5484D;
    --rg-green: #3FB950;
    --rg-red-wash: #2B1A1B;
    --rg-green-wash: #172A1C;
  }
}

/* ---------- Base ---------- */
html, body.rg-body,
.rg-body h1, .rg-body h2, .rg-body h3, .rg-body h4, .rg-body h5, .rg-body h6 {
  font-family: var(--rg-sans);
}
body.rg-body {
  background: var(--rg-ground);
  color: var(--rg-text);
  font-size: 17px;
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
.rg-main { flex: 1; width: 100%; max-width: 860px; padding: 24px 0 64px; }
.rg-body a { color: inherit; }
.rg-body :focus-visible { outline: 3px solid var(--rg-green); outline-offset: 2px; }
.rg-mono, .rg-body code, .rg-body pre, .rg-body kbd { font-family: var(--rg-mono); }
.rg-muted { color: var(--rg-muted); }
.w3-margin-0 { margin: 0; }

.rg-skip { position: absolute; left: -999px; top: 8px; z-index: 10; }
.rg-skip:focus { left: 8px; }

/* ---------- Color utilities (W3-style naming) ---------- */
.rg-ink, .rg-ink:hover { background: var(--rg-ink) !important; color: #F4F1EA !important; }
.rg-cream { background: #F4F1EA !important; color: var(--rg-ink) !important; }
.rg-red { background: var(--rg-red) !important; color: #fff !important; }
.rg-green { background: var(--rg-green) !important; color: #fff !important; }
.rg-text-red { color: var(--rg-red) !important; }
.rg-text-green { color: var(--rg-green) !important; }
.rg-text-red-bright { color: var(--rg-red-bright) !important; }
.rg-text-green-bright { color: var(--rg-green-bright) !important; }

/* ---------- Signal bar + header ---------- */
.rg-signal { display: flex; height: 4px; }
.rg-signal span { flex: 1; background: var(--rg-red-bright); }
.rg-signal span + span { background: var(--rg-green-bright); }

.rg-header { border-bottom: 1px solid var(--rg-line); background: var(--rg-ground); }
.rg-bar { max-width: 860px; padding: 14px 16px; overflow: visible; }
.rg-bar .rg-brand { display: flex; align-items: center; gap: 12px; padding: 0 !important; text-decoration: none; }
.rg-mark { flex: none; display: block; }
.rg-wordmark { display: flex; flex-direction: column; line-height: 1; }
.rg-wm-name { font-weight: 800; font-size: 22px; letter-spacing: -0.5px; }
.rg-wm-tag {
  font-family: var(--rg-mono); font-weight: 500; font-size: 10px;
  letter-spacing: 5px; text-transform: uppercase; color: var(--rg-muted); margin-top: 5px;
}

.rg-nav { display: flex; align-items: center; margin-top: 2px; }
.rg-nav-link.w3-button {
  font-weight: 600; font-size: 15px; padding: 8px 14px;
  background: transparent; color: var(--rg-text);
  border-bottom: 2px solid transparent;
}
.rg-nav-link.w3-button:hover { background: transparent !important; color: var(--rg-red) !important; }
.rg-nav-link[aria-current="page"] { border-bottom-color: var(--rg-green); }
.rg-mobile-nav { border-top: 1px solid var(--rg-line); }
.rg-mobile-nav .rg-nav-link { border-bottom: 0; border-left: 3px solid transparent; }
.rg-mobile-nav .rg-nav-link[aria-current="page"] { border-left-color: var(--rg-green); }

/* ---------- Type ---------- */
.rg-eyebrow {
  font-size: 12px; font-weight: 500; letter-spacing: 3px; text-transform: uppercase;
  color: var(--rg-muted); margin: 0 0 12px;
}
.rg-eyebrow a { text-decoration: none; }
.rg-hero { padding-top: 56px !important; padding-bottom: 32px !important; }
.rg-hero-title {
  font-size: clamp(36px, 6vw, 60px); font-weight: 800; line-height: 1.05;
  letter-spacing: -1.5px; margin: 0 0 20px; max-width: 16ch;
}
.rg-hero-title em, .rg-h1 em { font-style: normal; }
em.fail { color: var(--rg-red); }
em.pass { color: var(--rg-green); }
.rg-lede { color: var(--rg-muted); max-width: 56ch; margin-top: 0; }
.rg-h1 { font-size: clamp(30px, 4.5vw, 44px); font-weight: 800; letter-spacing: -1px; line-height: 1.1; margin: 0 0 12px; }
.rg-h2 { font-size: 22px; font-weight: 700; margin: 0; }
.rg-page-head { padding-top: 40px !important; padding-bottom: 8px !important; }
.rg-section-head { display: flex; justify-content: space-between; align-items: baseline; border-bottom: 2px solid var(--rg-text); padding-bottom: 8px; margin-bottom: 4px; }
.rg-section-head a { text-decoration: none; color: var(--rg-green); }

/* ---------- Buttons ---------- */
.rg-btn-ink.w3-button { background: var(--rg-text); color: var(--rg-ground); font-weight: 600; margin: 0 8px 8px 0; }
.rg-btn-ink.w3-button:hover { background: var(--rg-green) !important; color: #fff !important; }
.rg-btn-green.w3-button { background: var(--rg-green); color: #fff; font-weight: 600; }
.rg-btn-green.w3-button:hover { background: var(--rg-text) !important; color: var(--rg-ground) !important; }
.rg-btn-outline.w3-button { background: transparent; color: var(--rg-text); border: 2px solid var(--rg-text); font-weight: 600; margin: 0 8px 8px 0; }
.rg-btn-outline.w3-button:hover { background: var(--rg-text) !important; color: var(--rg-ground) !important; }

/* ---------- Post list ---------- */
.rg-post-list.w3-ul li { border-bottom: 1px solid var(--rg-line); padding: 16px 0; }
.rg-post-link { display: flex; gap: 20px; align-items: baseline; text-decoration: none; }
.rg-post-link time { flex: none; min-width: 92px; }
.rg-post-title { font-weight: 600; font-size: 18px; }
.rg-post-link:hover .rg-post-title { color: var(--rg-red); }
.rg-post-item p { padding-left: 112px; font-size: 15px; }
@media (max-width: 600px) {
  .rg-post-link { flex-direction: column; gap: 2px; }
  .rg-post-item p { padding-left: 0; }
}

/* ---------- Tags ---------- */
.rg-tags { display: inline-flex; flex-wrap: wrap; gap: 6px; }
.rg-tag.w3-tag {
  background: var(--rg-surface); color: var(--rg-text); border: 1px solid var(--rg-line);
  font-family: var(--rg-mono); font-size: 13px; padding: 2px 10px; text-decoration: none;
}
.rg-tag.w3-tag:hover { border-color: var(--rg-green); color: var(--rg-green); }
.rg-tag-cloud { display: flex; flex-wrap: wrap; gap: 10px; }
.rg-count { color: var(--rg-muted); font-size: 0.8em; margin-left: 4px; }

/* ---------- Prose ---------- */
.rg-prose { max-width: 68ch; }
.rg-prose h2 { font-size: 26px; font-weight: 700; margin: 2em 0 0.5em; letter-spacing: -0.4px; }
.rg-prose h3 { font-size: 20px; font-weight: 700; margin: 1.6em 0 0.4em; }
.rg-prose a { color: var(--rg-green); text-decoration-thickness: 1.5px; text-underline-offset: 3px; }
.rg-prose a:hover { color: var(--rg-red); }
.rg-prose img { max-width: 100%; height: auto; border-radius: 8px; }
.rg-prose hr { border: 0; border-top: 1px solid var(--rg-line); margin: 2.5em 0; }
.rg-prose blockquote {
  margin: 1.5em 0; padding: 4px 0 4px 20px; border-left: 4px solid var(--rg-green);
  color: var(--rg-muted); font-size: 1.05em;
}
.rg-prose :not(pre) > code {
  background: var(--rg-surface); border: 1px solid var(--rg-line);
  border-radius: 4px; padding: 1px 5px; font-size: 0.88em;
}
.rg-prose pre {
  background: var(--rg-ink) !important; color: #F4F1EA;
  padding: 18px 20px; border-radius: 10px; overflow-x: auto;
  font-size: 14px; line-height: 1.6; border-top: 3px solid var(--rg-green-bright);
}
.rg-prose table { border-collapse: collapse; width: 100%; margin: 1.5em 0; font-size: 15px; }
.rg-prose th, .rg-prose td { border-bottom: 1px solid var(--rg-line); padding: 8px 10px; text-align: left; }
.rg-prose th { border-bottom: 2px solid var(--rg-text); }

/* ---------- Callout shortcode ---------- */
.rg-callout.w3-panel { padding: 4px 18px 6px; margin: 1.5em 0; border-radius: 0 8px 8px 0; background: var(--rg-surface); border-color: var(--rg-text) !important; }
.rg-callout-fail.w3-panel { background: var(--rg-red-wash); border-color: var(--rg-red) !important; }
.rg-callout-pass.w3-panel { background: var(--rg-green-wash); border-color: var(--rg-green) !important; }
.rg-callout-label { font-size: 12px; font-weight: 500; letter-spacing: 2px; text-transform: uppercase; margin: 12px 0 4px; }
.rg-callout-fail .rg-callout-label { color: var(--rg-red); }
.rg-callout-pass .rg-callout-label { color: var(--rg-green); }

/* ---------- Cards / prev-next ---------- */
.rg-prevnext { margin-top: 48px; }
.rg-card.w3-card { background: var(--rg-surface); padding: 14px 18px; margin-bottom: 12px; text-decoration: none; border-radius: 8px; box-shadow: none; border: 1px solid var(--rg-line); }
.rg-card-title { display: block; font-weight: 700; margin-top: 2px; }
.rg-edge-red { border-left: 4px solid var(--rg-red) !important; }
.rg-edge-green { border-right: 4px solid var(--rg-green) !important; }
.rg-card:hover { border-color: var(--rg-text); }

/* ---------- Pager ---------- */
.rg-pager { margin-top: 24px; display: flex; justify-content: center; align-items: center; gap: 8px; }

/* ---------- Footer ---------- */
.rg-footer { margin-top: auto; }
.rg-footer .w3-content { max-width: 860px; }
.rg-footer-brand { display: flex; align-items: center; gap: 12px; }
.rg-footer-brand .rg-mark rect { stroke: #2E3237; stroke-width: 2; }
.rg-footer .rg-muted { color: #A3A7AD; }
.rg-footer-links { text-align: right; }
.rg-footer-links .w3-button { color: #F4F1EA; }
.rg-footer-links .w3-button:hover { background: transparent !important; color: var(--rg-green-bright) !important; }
@media (max-width: 600px) {
  .rg-footer-links { text-align: left; margin-top: 16px; }
}