/* RippleNav lesson stylesheet — shared by every lesson & landing page.
   Authored locally with:  cd site && python3 -m http.server 8000
   The deploy generator rewrites relative links to /assets/… for production. */

:root {
  --bg: #0a0a0c;
  --surface: #111118;
  --border: #1a1a2e;
  --text: #c8c8d0;
  --text-dim: #9090a0;
  --accent: #6ed5ff;
  --accent2: #c9abff;
  --warn: #cc9933;
  --good: #33cc88;
  --heading: #e0e0e8;
  --font: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }
html { background: var(--bg); }
body {
  margin: 0 auto;
  max-width: 720px;
  padding: 2rem 1.5rem 6rem;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

h1 { color: var(--heading); font-size: 1.6rem; margin: 0 0 1.2rem; }
h2 { color: var(--heading); font-size: 1.25rem; margin: 2rem 0 .6rem; }
h3 { color: var(--heading); font-size: 1.05rem; margin: 1.6rem 0 .5rem; }

p { margin: 0 0 1rem; }
a { color: var(--accent); }
strong { color: var(--heading); }
em { color: var(--accent2); }

ul, ol { margin: 0 0 1rem 1.4rem; }
li { margin-bottom: .45rem; }
hr { border: none; border-top: 1px solid var(--border); margin: 2.5rem 0; }

/* callout boxes used by lessons */
.callout {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 0 8px 8px 0;
  padding: 1rem 1.3rem;
  margin: 1.5rem 0;
}
.callout.warn { border-left-color: var(--warn); background: #1a1508; }
.callout.good { border-left-color: var(--good); }
.callout .title {
  display: block;
  font-weight: 700;
  color: var(--heading);
  margin-bottom: .35rem;
}

.pending {
  border: 1px dashed var(--warn);
  color: var(--warn);
  border-radius: 8px;
  padding: 1rem 1.3rem;
  margin: 1.5rem 0;
}

.muted { color: var(--text-dim); font-size: .9rem; }
.small { font-size: .85rem; }

code, .mono {
  font-family: 'SF Mono', 'Cascadia Code', 'Fira Code', Consolas, monospace;
  font-size: .9em;
}

.btn {
  display: inline-block;
  background: var(--accent);
  color: #04121a;
  font-weight: 600;
  padding: .6rem 1.2rem;
  border-radius: 6px;
  text-decoration: none;
  margin: .25rem .35rem .25rem 0;
}
.btn.sec { background: transparent; color: var(--accent); border: 1px solid var(--accent); }