:root {
	--bg: #f6f7f9; --card: #fff; --fg: #1d2330; --muted: #5b6474; --line: #dfe3ea;
	--accent: #2456c4; --sev0: #1c8c4c; --sev1: #c9a400; --sev2: #e0731a; --sev3: #c8322b;
	--mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}
@media (prefers-color-scheme: dark) {
	:root { --bg: #14171c; --card: #1d2128; --fg: #e6e9ef; --muted: #9aa4b5; --line: #2f3641; --accent: #7aa2ff; }
}
* { box-sizing: border-box; }
html { font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; background: var(--bg); color: var(--fg); }
body { margin: 0 auto; max-width: 62rem; padding: 1rem; }
header h1 { margin: .2rem 0 .3rem; font-size: 1.7rem; }
.lede { margin: 0 0 1rem; color: var(--muted); }
.instance { margin: 0 0 .6rem; font-size: .95rem; } .instance b { color: var(--accent); } .instance a { margin-left: .5rem; color: var(--accent); }
h2 { font-size: 1.15rem; margin: 0 0 .5rem; }
h2 small { font-weight: normal; color: var(--muted); font-size: .8rem; margin-left: .4rem; }
section { margin: 0 0 1rem; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: .6rem; padding: 1rem; }
.hidden { display: none !important; }
.muted { color: var(--muted); font-size: .9rem; }
.row { display: flex; flex-wrap: wrap; gap: .6rem 1rem; align-items: center; margin: .3rem 0; }
label { font-size: .95rem; }
select, button, textarea { font: inherit; color: inherit; }
select { padding: .3rem .4rem; background: var(--card); border: 1px solid var(--line); border-radius: .35rem; }
button { padding: .45rem 1rem; border-radius: .4rem; border: 1px solid var(--accent); background: var(--accent); color: #fff; cursor: pointer; }
button.secondary { background: transparent; color: var(--accent); }
button:disabled { opacity: .5; cursor: default; }
.advanced { margin-top: .4rem; font-size: .9rem; }
.advanced summary { cursor: pointer; color: var(--muted); }
.status { margin-top: .6rem; min-height: 1.4rem; }
.bar { height: .5rem; background: var(--line); border-radius: .25rem; overflow: hidden; margin-top: .4rem; }
.bar-fill { height: 100%; width: 0; background: var(--accent); transition: width .15s linear; }
#verdict { border-left: .5rem solid var(--sev0); }
#verdict.sev-0 { border-left-color: var(--sev0); } #verdict.sev-1 { border-left-color: var(--sev1); }
#verdict.sev-2 { border-left-color: var(--sev2); } #verdict.sev-3 { border-left-color: var(--sev3); }
#verdict h2 { font-size: 1.3rem; }
.kv { display: grid; grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr)); gap: .4rem 1rem; margin-top: .6rem; }
.kv div { font-size: .9rem; color: var(--muted); }
.kv div b { display: block; color: var(--fg); font-size: 1.05rem; }
.finding { background: var(--card); border: 1px solid var(--line); border-left-width: .4rem; border-radius: .6rem; padding: .8rem 1rem; margin-bottom: .6rem; }
.finding.sev-1 { border-left-color: var(--sev1); } .finding.sev-2 { border-left-color: var(--sev2); } .finding.sev-3 { border-left-color: var(--sev3); }
.finding h3 { margin: 0 0 .3rem; font-size: 1.05rem; }
.finding .tag { display: inline-block; font-size: .75rem; padding: .05rem .45rem; border-radius: 1rem; background: var(--line); margin-left: .4rem; vertical-align: middle; }
.finding p { margin: .3rem 0; }
.finding details { margin-top: .3rem; font-size: .9rem; }
.finding details summary { cursor: pointer; color: var(--muted); }
.finding code, .evidence { font-family: var(--mono); font-size: .85rem; }
table { width: 100%; border-collapse: collapse; font-size: .92rem; }
th, td { text-align: left; padding: .35rem .5rem; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 600; }
tr.sev-1 td:first-child { border-left: .3rem solid var(--sev1); } tr.sev-2 td:first-child { border-left: .3rem solid var(--sev2); } tr.sev-3 td:first-child { border-left: .3rem solid var(--sev3); }
tr.sev-0 td:first-child { border-left: .3rem solid transparent; }
tr.expl td { color: var(--muted); font-size: .88rem; background: var(--bg); }
tr.clickable { cursor: pointer; }
.sevlabel { font-weight: 600; }
.sevlabel.s0 { color: var(--sev0); } .sevlabel.s1 { color: var(--sev1); } .sevlabel.s2 { color: var(--sev2); } .sevlabel.s3 { color: var(--sev3); }
.chart { background: var(--card); border: 1px solid var(--line); border-radius: .6rem; padding: .6rem; margin-bottom: .6rem; }
.chart svg { width: 100%; height: auto; display: block; }
.chart .axis { stroke: var(--line); stroke-width: 1; }
.chart .grid { stroke: var(--line); stroke-width: .5; stroke-dasharray: 2 3; }
.chart text { fill: var(--muted); font-size: 11px; font-family: system-ui, sans-serif; }
.chart .title { fill: var(--fg); font-size: 13px; font-weight: 600; }
.chart .band-Recovery { fill: var(--sev2); opacity: .18; } .chart .band-Loss { fill: var(--sev3); opacity: .22; } .chart .band-Disorder { fill: var(--sev1); opacity: .18; } .chart .band-CWR { fill: var(--sev1); opacity: .12; }
.chart .line { fill: none; stroke-width: 1.8; stroke-linejoin: round; }
.chart .c0 { stroke: var(--accent); } .chart .c1 { stroke: var(--sev2); } .chart .c2 { stroke: var(--sev0); } .chart .c3 { stroke: var(--sev3); } .chart .c4 { stroke: #8a5cf5; }
.chart .legend rect.c0 { fill: var(--accent); } .chart .legend rect.c1 { fill: var(--sev2); } .chart .legend rect.c2 { fill: var(--sev0); } .chart .legend rect.c3 { fill: var(--sev3); } .chart .legend rect.c4 { fill: #8a5cf5; }
.chart .note { font-size: .85rem; color: var(--muted); margin: .3rem .2rem 0; }
.sock { margin-bottom: .8rem; }
.sock h3 { font-size: .95rem; margin: 0 0 .2rem; }
.sock pre { font-family: var(--mono); font-size: .78rem; white-space: pre-wrap; word-break: break-all; background: var(--bg); padding: .5rem; border-radius: .4rem; margin: 0; }
textarea { width: 100%; font-family: var(--mono); font-size: .8rem; background: var(--bg); border: 1px solid var(--line); border-radius: .4rem; padding: .5rem; }
#raw { font-family: var(--mono); font-size: .75rem; white-space: pre-wrap; word-break: break-all; max-height: 30rem; overflow: auto; background: var(--bg); padding: .5rem; border-radius: .4rem; }
#glossary details { margin: .2rem 0; } #glossary summary { cursor: pointer; } #glossary p { margin: .3rem 0 .6rem 1rem; color: var(--muted); font-size: .92rem; }
footer { margin: 2rem 0 1rem; font-size: .8rem; }
code { font-family: var(--mono); font-size: .88em; }
.shaping { margin-top: .6rem; }
.shaping summary { cursor: pointer; color: var(--muted); }
.shaping pre { font-family: var(--mono); font-size: .78rem; white-space: pre-wrap; word-break: break-all; background: var(--bg); padding: .5rem; border-radius: .4rem; margin: .4rem 0 0; }
table.mini { border-collapse: collapse; margin: .4rem 0 0; font-size: .82rem; width: 100%; }
table.mini th, table.mini td { text-align: left; padding: .25rem .55rem; border-bottom: 1px solid var(--border); }
table.mini th { color: var(--muted); font-weight: 600; }
table.mini tr.egress td { background: color-mix(in srgb, var(--accent) 12%, transparent); font-weight: 600; }

/* live server-load badge (first-visit accuracy hint) */
.loadbadge { display: flex; align-items: baseline; gap: .6rem; flex-wrap: wrap;
	margin: 0 0 1rem; padding: .55rem .8rem; border-radius: .5rem;
	border: 1px solid var(--border); font-size: .9rem; }
.loadbadge .dot { width: .7rem; height: .7rem; border-radius: 50%; flex: 0 0 auto; align-self: center; }
.loadbadge b { font-weight: 700; }
.loadbadge .note { color: var(--muted); }
.loadbadge.load-ok    { background: color-mix(in srgb, var(--ok, #1a8f4c) 10%, transparent); border-color: color-mix(in srgb, var(--ok, #1a8f4c) 40%, var(--border)); }
.loadbadge.load-ok    .dot { background: var(--ok, #1a8f4c); }
.loadbadge.load-warn  { background: color-mix(in srgb, var(--warn, #b8860b) 12%, transparent); border-color: color-mix(in srgb, var(--warn, #b8860b) 45%, var(--border)); }
.loadbadge.load-warn  .dot { background: var(--warn, #b8860b); }
.loadbadge.load-busy  { background: color-mix(in srgb, var(--bad, #c0392b) 12%, transparent); border-color: color-mix(in srgb, var(--bad, #c0392b) 45%, var(--border)); }
.loadbadge.load-busy  .dot { background: var(--bad, #c0392b); }

/* "For your connection" use-case summary */
#usage-body p { margin: .35rem 0; }
.usage-line { display: flex; align-items: baseline; gap: .5rem; }
.usage-dot { width: .6rem; height: .6rem; border-radius: 50%; flex: 0 0 auto; align-self: center; }
.usage-dot.u-ok   { background: var(--ok, #1a8f4c); }
.usage-dot.u-warn { background: var(--warn, #b8860b); }

/* IPv4-vs-IPv6 comparison table */
table.cmp { border-collapse: collapse; margin: .3rem 0 .6rem; }
table.cmp th, table.cmp td { text-align: left; padding: .25rem .9rem .25rem 0; border-bottom: 1px solid var(--border, #ddd); }
table.cmp th { font-weight: 600; }
table.cmp td:first-child, table.cmp th:first-child { color: var(--muted, #666); }