:root {
  --bg: #0e1116;
  --panel: #161b22;
  --panel-2: #1c232c;
  --border: #2a323d;
  --text: #e6edf3;
  --muted: #9aa7b4;
  --accent: #2ea043;
  --accent-2: #3fb950;
  --shove: #2ea043;
  --call: #388bfd;
  --fold: #30363d;
  --mix: #d29922;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }

header.site {
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  position: sticky;
  top: 0;
  z-index: 10;
}
header.site .brand { font-weight: 700; font-size: 1.15rem; }
header.site .brand span { color: var(--accent-2); }
header.site nav a { color: var(--muted); font-size: .95rem; }
header.site nav a:hover { color: var(--text); text-decoration: none; }

main {
  max-width: 1000px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

h1 { font-size: 2rem; margin: 0 0 .3rem; }
h2 { font-size: 1.4rem; margin: 2.5rem 0 .8rem; border-bottom: 1px solid var(--border); padding-bottom: .4rem; }
h3 { font-size: 1.1rem; margin: 1.8rem 0 .6rem; color: var(--accent-2); }
.lead { color: var(--muted); font-size: 1.1rem; margin-top: 0; }

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.2rem 1.4rem;
  margin: 1rem 0;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}
.grid .card { margin: 0; }
.grid .card h3 { margin-top: 0; }

.callout {
  border-left: 4px solid var(--accent);
  background: var(--panel-2);
  padding: .8rem 1rem;
  border-radius: 0 8px 8px 0;
  margin: 1rem 0;
}
.callout.warn { border-left-color: var(--mix); }

table.data {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: .92rem;
}
table.data th, table.data td {
  border: 1px solid var(--border);
  padding: .5rem .7rem;
  text-align: left;
  vertical-align: top;
}
table.data th { background: var(--panel-2); }
table.data code { color: var(--accent-2); }

.range-wrap { overflow-x: auto; margin: 1rem 0; }
table.range {
  border-collapse: collapse;
  font-size: 16px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  margin: 0 auto;
}
table.range td {
  width: 46px; height: 46px;
  text-align: center;
  border: 1px solid var(--bg);
  color: #0e1116;
  font-weight: 600;
  user-select: none;
}
td.s { background: var(--shove); }      /* shove / raise */
td.c { background: var(--call); color: #fff; } /* call */
td.f { background: var(--fold); color: #6e7681; } /* fold */
td.m { background: var(--mix); }         /* mixed / marginal */

.legend { display: flex; gap: 1.2rem; flex-wrap: wrap; margin: .6rem 0 0; font-size: .85rem; color: var(--muted); }
.legend span::before {
  content: ""; display: inline-block; width: 12px; height: 12px;
  border-radius: 3px; margin-right: .4rem; vertical-align: middle;
}
.legend .l-s::before { background: var(--shove); }
.legend .l-c::before { background: var(--call); }
.legend .l-f::before { background: var(--fold); border: 1px solid var(--border); }

.grid-viewer {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
  margin: 1rem 0;
}
.gv-btns { display: flex; gap: .4rem; flex-wrap: wrap; margin-bottom: .8rem; }
.gv-btns button {
  background: var(--panel-2);
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: .35rem .7rem;
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
}
.gv-btns button:hover { color: var(--text); }
.gv-btns button.on { background: var(--accent); color: #0e1116; border-color: var(--accent); }
.gv-grid { display: flex; justify-content: center; }

.gt {
  color: var(--accent-2);
  border-bottom: 1px dotted var(--accent-2);
  cursor: help;
  font-weight: 600;
}
.gt:hover, .gt:focus { color: #fff; outline: none; }

.gt-pop {
  position: absolute;
  z-index: 50;
  max-width: 300px;
  background: var(--panel-2);
  border: 1px solid var(--accent);
  border-radius: 8px;
  padding: .7rem .9rem;
  font-size: .9rem;
  box-shadow: 0 8px 24px rgba(0,0,0,.55);
}
.gt-pop strong { display: block; color: var(--accent-2); margin-bottom: .3rem; }
.gt-pop p { margin: 0 0 .5rem; }
.gt-pop a { font-size: .82rem; }

dl.dict { margin: 1rem 0; }
dl.dict dt { font-weight: 700; color: var(--accent-2); margin-top: 1.2rem; scroll-margin-top: 90px; }
dl.dict dd { margin: .25rem 0 0; }

footer.site {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: .85rem;
  padding: 1.5rem;
  text-align: center;
}