/* Shared "PCB" theme for the Race Condition pages (served at /style.css).
   Holds the palette and the page chrome (background, nav) used by index,
   about, hexpansions and admin; everything page-specific stays in that page's
   own <style> block. The :root palette is the superset across pages — unused
   variables cost nothing. */
:root {
    --bg:         #0d1c0c;
    --surface:    #132211;
    --trace:      #1e3a1a;
    --silk:       #c8e6b4;
    --silk-mid:   rgba(200, 230, 180, 0.68);
    --silk-dim:   rgba(200, 230, 180, 0.38);
    --copper:     #c8793a;
    --copper-bg:  rgba(200, 121, 58, 0.1);
    --led-green:  #22c55e;
    --led-amber:  #f59e0b;
    --led-blue:   #60a5fa;
    --led-red:    #ef4444;
    --ok:         #22c55e;
    --bad:        #ef4444;
    --gold:       #f59e0b;
    --silver:     #94a3b8;
    --bronze:     #c87941;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    color: var(--silk);
    font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
    background-color: var(--bg);
    background-image:
        radial-gradient(circle, rgba(30, 58, 26, 0.85) 1px, transparent 1px),
        radial-gradient(circle, rgba(30, 58, 26, 0.85) 1px, transparent 1px);
    background-size: 24px 42px;
    background-position: 0 0, 12px 21px;
}

/* ── Nav ── */
nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(13, 28, 12, 0.96);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--trace);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    height: 52px;
}
.nav-brand {
    font-family: "Space Mono", monospace;
    font-weight: 700;
    font-size: 14px;
    letter-spacing: 0.14em;
    text-decoration: none;
    color: var(--copper);
    text-transform: uppercase;
}
/* Right-hand side of the nav: the index uses a link row, the content pages
   (about, hexpansions) a single "back" link. */
.nav-links { display: flex; gap: 2px; }
.nav-links a {
    text-decoration: none;
    color: var(--silk-mid);
    font-size: 12px;
    font-family: "IBM Plex Mono", monospace;
    padding: 6px 11px;
    border-radius: 3px;
    transition: color 0.12s, background 0.12s;
}
.nav-links a:hover { color: var(--silk); background: rgba(200, 230, 180, 0.06); }
/* Separates the section anchors from links that leave the index page. */
.nav-divider {
    width: 1px;
    align-self: stretch;
    margin: 8px 8px;
    background: var(--trace);
}
.nav-links a.nav-page { color: var(--silk-dim); font-style: italic; }
.nav-links a.nav-page:hover { color: var(--silk); }
.nav-back {
    font-size: 12px;
    font-family: "IBM Plex Mono", monospace;
    color: var(--silk-dim);
    text-decoration: none;
    transition: color 0.12s;
}
.nav-back:hover { color: var(--silk-mid); }