:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --ink: #1c2024;
  --muted: #667085;
  --line: #dfe3e8;
  --accent: #2f5bd7;
  --accent-soft: #eaf0fe;
  --warn: #b54708;
  --warn-soft: #fff6ed;
  --ok: #17683a;
  --ok-soft: #eaf7ef;
  --radius: 8px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

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

header.top {
  background: var(--panel);
  border-bottom: 1px solid var(--line);
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 24px;
  height: 56px;
  position: sticky;
  top: 0;
  z-index: 5;
}
header.top .brand { font-weight: 650; letter-spacing: -0.01em; }
header.top nav { display: flex; gap: 18px; flex: 1; }
header.top nav a { color: var(--muted); font-weight: 500; }
header.top nav a.on { color: var(--ink); }
header.top .who { color: var(--muted); font-size: 13px; display: flex; gap: 12px; align-items: center; }

main { max-width: 1060px; margin: 0 auto; padding: 28px 24px 80px; }
main.wide { max-width: 1360px; }

h1 { font-size: 24px; margin: 0 0 4px; letter-spacing: -0.02em; }
h2 { font-size: 17px; margin: 28px 0 12px; letter-spacing: -0.01em; }
h3 { font-size: 14px; margin: 20px 0 8px; }
p.lede { color: var(--muted); margin: 0 0 20px; }

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin-bottom: 16px;
}
.panel.tight { padding: 0; overflow: hidden; }

.crumbs { color: var(--muted); font-size: 13px; margin-bottom: 10px; }
.crumbs a { color: var(--muted); }

.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--line); margin: 18px 0 20px; }
.tabs a {
  padding: 8px 14px; color: var(--muted); font-weight: 500;
  border-bottom: 2px solid transparent; margin-bottom: -1px;
}
.tabs a.on { color: var(--ink); border-bottom-color: var(--accent); }

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 11px 20px; border-bottom: 1px solid var(--line); }
th { font-size: 12px; text-transform: uppercase; letter-spacing: 0.04em; color: var(--muted); font-weight: 600; }
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover { background: #fafbfc; }

.pill {
  display: inline-block; padding: 2px 9px; border-radius: 999px;
  font-size: 12px; font-weight: 600; white-space: nowrap;
}
.pill.ok { background: var(--ok-soft); color: var(--ok); }
.pill.warn { background: var(--warn-soft); color: var(--warn); }
.pill.off { background: #f0f1f3; color: var(--muted); }
.pill.info { background: var(--accent-soft); color: var(--accent); }

label { display: block; font-weight: 550; font-size: 13px; margin-bottom: 4px; }
label .hint { display: block; font-weight: 400; color: var(--muted); font-size: 12px; }

input[type=text], input[type=password], input[type=date], input[type=number],
input[type=email], select, textarea {
  width: 100%; padding: 8px 10px; border: 1px solid var(--line);
  border-radius: 6px; font: inherit; background: #fff; color: var(--ink);
}
textarea { resize: vertical; min-height: 80px; }
input:focus, select:focus, textarea:focus {
  outline: 2px solid var(--accent-soft); border-color: var(--accent);
}

.field { margin-bottom: 16px; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 0 20px; }

button, .btn {
  display: inline-block; padding: 8px 15px; border-radius: 6px;
  border: 1px solid var(--accent); background: var(--accent); color: #fff;
  font: inherit; font-weight: 550; cursor: pointer;
}
button:hover, .btn:hover { filter: brightness(1.06); text-decoration: none; }
button.ghost, .btn.ghost { background: #fff; color: var(--ink); border-color: var(--line); }
button.danger, .btn.danger { background: #fff; color: #b42318; border-color: #f3c3bd; }
button.small, .btn.small { padding: 5px 11px; font-size: 13px; }

.row { display: flex; gap: 10px; align-items: center; }
.row.end { justify-content: flex-end; }
.spread { display: flex; justify-content: space-between; align-items: flex-start; gap: 20px; }

.flash {
  background: var(--accent-soft); border: 1px solid #c9d8fb; color: #1c3a8f;
  padding: 10px 14px; border-radius: var(--radius); margin-bottom: 16px;
}

.muted { color: var(--muted); }
.small { font-size: 13px; }
code, .mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; }
code { background: #f0f1f3; padding: 1px 5px; border-radius: 4px; }

/* Module toggle list */
.section-block { border: 1px solid var(--line); border-radius: var(--radius); margin-bottom: 12px; overflow: hidden; }
.section-head {
  background: #fafbfc; padding: 10px 16px; border-bottom: 1px solid var(--line);
  display: flex; align-items: center; gap: 10px;
}
.section-head .title { font-weight: 600; }
.module-row {
  padding: 9px 16px 9px 40px; display: flex; align-items: center; gap: 10px;
  border-bottom: 1px solid #f0f1f3;
}
.module-row:last-child { border-bottom: 0; }
.module-row.dim { opacity: 0.5; }
.module-row .num { color: var(--muted); font-size: 12px; min-width: 32px; }
.module-row .grow { flex: 1; }
input[type=checkbox] { width: 16px; height: 16px; accent-color: var(--accent); }

/* Preview */
.preview {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px 34px; max-height: 720px; overflow-y: auto;
}
.preview h1 { font-size: 22px; border-bottom: 1px solid var(--line); padding-bottom: 8px; }
.preview h2 { font-size: 18px; margin-top: 26px; }
.preview h3 { font-size: 15px; margin-top: 18px; }
.preview pre {
  white-space: pre-wrap; font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13px; line-height: 1.65; margin: 0;
}
.preview .tok { background: #fff1c2; color: #7a4b00; border-radius: 3px; padding: 0 3px; font-weight: 600; }

.split { display: grid; grid-template-columns: minmax(340px, 5fr) 7fr; gap: 20px; align-items: start; }
@media (max-width: 900px) { .split { grid-template-columns: 1fr; } }

.gap-list { list-style: none; padding: 0; margin: 0; }
.gap-list li { padding: 7px 0; border-bottom: 1px solid #f0f1f3; font-size: 13px; }
.gap-list li:last-child { border-bottom: 0; }
.gap-list .where { color: var(--muted); }

.diff { font-family: ui-monospace, Menlo, monospace; font-size: 12.5px; line-height: 1.5; white-space: pre; overflow-x: auto; }
.diff .add { background: var(--ok-soft); display: block; }
.diff .del { background: #fdeceb; display: block; }
.diff .meta { color: var(--muted); display: block; }

.editor { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13.5px; line-height: 1.6; min-height: 460px; }

.token-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.token-chips code { cursor: pointer; border: 1px solid var(--line); background: #fff; }
.token-chips code:hover { background: var(--accent-soft); border-color: var(--accent); }

.centred { max-width: 380px; margin: 80px auto; }