/* skaters documentation — shared stylesheet.
   Single source of truth so the landing page and demo pages match. */

:root {
  --bg: #fafafa;
  --panel: #fff;
  --text: #1a1a1a;
  --muted: #5a5a5a;
  --accent: #4a3aff;
  --accent-dark: #3322cc;
  --border: #e2e2e2;
  --code-bg: #f3f3f7;
  --header-bg: #1f1d3d;
  --header-bg-dark: #15132a;
  --good: #1a8c4a;
  --warn: #c2410c;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.55;
  font-size: 17px;
}

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

/* --- header / nav --- */
header.site-header {
  background: var(--header-bg);
  color: #fff;
  padding: 14px 24px;
  border-bottom: 1px solid var(--header-bg-dark);
  position: sticky;
  top: 0;
  z-index: 100;
}
header.site-header .nav-inner {
  max-width: 980px;
  margin: 0 auto;
  display: flex;
  gap: 18px;
  align-items: center;
  flex-wrap: wrap;
}
header.site-header .brand { font-weight: 600; font-size: 1.1rem; color: #fff; }
header.site-header nav { display: flex; flex-wrap: wrap; gap: 0 18px; margin-left: auto; }
header.site-header nav a { color: #fff; opacity: 0.85; font-size: 0.95rem; }
header.site-header nav a:hover { opacity: 1; }

/* --- layout --- */
main { max-width: 980px; margin: 32px auto; padding: 0 24px 60px; }
main.narrow { max-width: 860px; }

h1 { font-size: 2.1rem; margin: 0 0 4px; line-height: 1.2; }
.subtitle { color: var(--muted); font-size: 1.1rem; margin: 0 0 16px; }
.lead { font-size: 1.15rem; margin: 0 0 28px; }
h2 { font-size: 1.35rem; margin: 2.2em 0 0.6em; border-bottom: 1px solid var(--border); padding-bottom: 4px; }
h3 { font-size: 1.08rem; margin: 1.6em 0 0.4em; }
p, ul, ol { font-size: 1rem; }
ul, ol { padding-left: 1.4em; }
li { margin-bottom: 6px; }

code { background: var(--code-bg); padding: 1px 5px; border-radius: 3px; font-size: 0.92em; font-family: "SFMono-Regular", Menlo, Consolas, monospace; }
pre { background: var(--code-bg); padding: 12px 14px; border-radius: 6px; overflow-x: auto; font-size: 0.88em; }
pre code { background: none; padding: 0; }

.callout { background: #f1f0fb; border-left: 3px solid var(--accent); padding: 12px 18px; border-radius: 4px; margin: 18px 0; }
.callout.warn { background: #fff5ef; border-left-color: var(--warn); }

.tag-row { display: flex; flex-wrap: wrap; gap: 6px; margin: 12px 0; }
.tag { background: #ece9ff; color: var(--accent); border-radius: 3px; padding: 2px 8px; font-size: 0.8rem; }

table { border-collapse: collapse; width: 100%; font-size: 0.92rem; margin: 14px 0; }
table th, table td { padding: 6px 8px; border-bottom: 1px solid var(--border); text-align: left; }
table th { background: #efeefa; font-weight: 600; }
table td code { font-size: 0.86em; }
table td.num { text-align: right; font-variant-numeric: tabular-nums; }

footer { max-width: 980px; margin: 40px auto 24px; padding: 16px 24px; font-size: 0.85rem; color: var(--muted); border-top: 1px solid var(--border); }

/* --- buttons --- */
.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 8px 16px;
  border-radius: 5px;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: background 0.15s;
}
.btn:hover { background: var(--accent-dark); text-decoration: none; }
.btn.secondary { background: #ece9ff; color: var(--accent); }
.btn.secondary:hover { background: #ddd8ff; }
.btn-row { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0; }

/* --- card grid (demo gallery) --- */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; margin: 20px 0; }
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 18px;
  transition: box-shadow 0.15s, transform 0.15s;
}
a.card:hover { box-shadow: 0 4px 16px rgba(74, 58, 255, 0.12); transform: translateY(-2px); text-decoration: none; }
.card h3 { margin-top: 0; }
.card p { color: var(--muted); font-size: 0.92rem; margin-bottom: 0; }

/* --- demo controls --- */
.panel { background: var(--panel); border: 1px solid var(--border); border-radius: 8px; padding: 18px; margin: 18px 0; }
.controls { display: flex; flex-wrap: wrap; gap: 16px 22px; align-items: flex-end; margin-bottom: 16px; }
.control { display: flex; flex-direction: column; gap: 4px; font-size: 0.88rem; color: var(--muted); }
.control label { font-weight: 600; color: var(--text); }
.control select, .control input[type="range"] { font-size: 0.95rem; }
.control .val { font-variant-numeric: tabular-nums; color: var(--accent); }
canvas.plot { width: 100%; height: auto; background: var(--panel); border: 1px solid var(--border); border-radius: 6px; display: block; }
.legend { display: flex; gap: 18px; flex-wrap: wrap; font-size: 0.85rem; color: var(--muted); margin-top: 10px; }
.legend .swatch { display: inline-block; width: 14px; height: 14px; border-radius: 3px; vertical-align: middle; margin-right: 5px; }
.metric { font-variant-numeric: tabular-nums; }
.status { font-size: 0.9rem; color: var(--muted); }