:root {
  --bg: #f4f6f9; --card: #fff; --text: #1c2430; --muted: #6b7686; --line: #dde2ea;
  --accent: #2557d6; --accent-d: #1b44ab; --ok: #1f9d55; --warn: #e08a00; --err: #d23f3f; --grey: #9aa4b2;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #12161c; --card: #1b212b; --text: #e6eaf0; --muted: #8e99a8; --line: #2b3441; --accent: #5b8cff; --accent-d: #7aa1ff; }
}
* { box-sizing: border-box; }
body { margin: 0; font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; background: var(--bg); color: var(--text); }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1 { font-size: 1.5rem; margin: 0 0 .75rem; }
h2 { font-size: 1.1rem; margin: 0 0 .6rem; }
code, pre { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .9em; }
code { background: rgba(127,127,127,.15); padding: .05em .35em; border-radius: 4px; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.center { text-align: center; }

header.top { display: flex; justify-content: space-between; align-items: center; gap: 1rem; padding: .7rem 1.25rem; background: var(--card); border-bottom: 1px solid var(--line); }
.brand { font-weight: 700; font-size: 1.1rem; color: var(--text); }
.who { display: flex; align-items: center; gap: .9rem; }
nav.tabs { display: flex; flex-wrap: wrap; gap: .25rem; padding: 0 1.25rem; background: var(--card); border-bottom: 1px solid var(--line); }
nav.tabs a { padding: .65rem .85rem; color: var(--muted); border-bottom: 3px solid transparent; }
nav.tabs a:hover { color: var(--text); text-decoration: none; }
nav.tabs a.active { color: var(--accent); border-bottom-color: var(--accent); font-weight: 600; }
nav.tabs .sep { width: 1px; background: var(--line); margin: .5rem .5rem; }
main { max-width: 1100px; margin: 1.5rem auto; padding: 0 1.25rem; }

.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 1.1rem 1.25rem; margin: 0 0 1rem; }
.card.narrow { max-width: 560px; }
.row { display: flex; gap: .6rem; align-items: center; flex-wrap: wrap; }
.row.between { justify-content: space-between; }
.grid2 { display: grid; grid-template-columns: 2fr 1fr; gap: 1rem; }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: .75rem 1rem; }
@media (max-width: 800px) { .grid2, .grid3 { grid-template-columns: 1fr; } }

label { display: block; font-size: .85rem; color: var(--muted); margin: 0 0 .8rem; }
label.radio { display: flex; gap: .5rem; align-items: center; color: var(--text); font-size: .95rem; margin: .25rem 0; }
input, select, textarea { display: block; width: 100%; margin-top: .25rem; padding: .5rem .6rem; font: inherit; color: var(--text); background: var(--bg); border: 1px solid var(--line); border-radius: 7px; }
input[type=radio] { display: inline; width: auto; margin: 0; }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
fieldset { border: 1px solid var(--line); border-radius: 8px; margin: 0 0 1rem; padding: .75rem 1rem; }
legend { color: var(--muted); font-size: .85rem; padding: 0 .4rem; }
[hidden] { display: none !important; }

button, .btn { display: inline-block; font: inherit; cursor: pointer; padding: .45rem .9rem; border-radius: 7px; border: 1px solid var(--line); background: var(--card); color: var(--text); text-decoration: none; }
button:hover, .btn:hover { border-color: var(--accent); text-decoration: none; }
button.primary, .btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.primary:hover, .btn.primary:hover { background: var(--accent-d); }
button.danger { color: var(--err); border-color: var(--err); background: transparent; }
button.link { border: 0; background: none; color: var(--accent); padding: 0; }
form.inline { display: inline; }
.btn.block { display: block; text-align: center; margin-bottom: 1rem; }
label.check { display: flex; gap: .5rem; align-items: flex-start; color: var(--text); font-size: .95rem; margin: .3rem 0; }
label.check input { display: inline; width: auto; margin-top: .25rem; }

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: .55rem .5rem; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 600; font-size: .8rem; text-transform: uppercase; letter-spacing: .03em; }
td.actions { white-space: nowrap; text-align: right; }
td form .row input { max-width: 190px; margin: 0; }

.flash { padding: .65rem .9rem; border-radius: 8px; margin: 0 0 1rem; border: 1px solid; }
.flash.ok { background: rgba(31,157,85,.12); border-color: var(--ok); }
.flash.err { background: rgba(210,63,63,.12); border-color: var(--err); }
.flash.warn { background: rgba(224,138,0,.12); border-color: var(--warn); }
.flash ul { margin: 0; padding-left: 1.1rem; }

.badge { display: inline-block; font-size: .72rem; padding: .05rem .5rem; border-radius: 99px; border: 1px solid var(--line); color: var(--muted); }
.badge.warn { color: var(--warn); border-color: var(--warn); }
.badge.ok { color: var(--ok); border-color: var(--ok); }

.dot { display: inline-block; width: .8rem; height: .8rem; border-radius: 50%; background: var(--grey); vertical-align: -1px; }
.dot-ok { background: var(--ok); box-shadow: 0 0 0 3px rgba(31,157,85,.2); }
.dot-outdated { background: var(--warn); }
.dot-offline { background: var(--err); }
.dot-never { background: var(--grey); }

pre.conf { background: var(--bg); border: 1px solid var(--line); border-radius: 8px; padding: .8rem; overflow: auto; white-space: pre-wrap; word-break: break-all; margin: .5rem 0 .8rem; }
img.qr { max-width: 100%; width: 320px; height: auto; background: #fff; padding: 6px; border-radius: 8px; }
details.danger-zone { margin-top: .8rem; border-top: 1px dashed var(--line); padding-top: .6rem; }
details summary { cursor: pointer; color: var(--muted); }

ul.results { list-style: none; padding: 0; margin: .6rem 0 0; }
ul.results li { padding: .25rem 0; }
ul.results li::before { display: inline-block; width: 1.4em; font-weight: 700; }
ul.results li.ok::before { content: "✔"; color: var(--ok); }
ul.results li.warn::before { content: "!"; color: var(--warn); }
ul.results li.err::before { content: "✘"; color: var(--err); }
.legend .dot { margin-left: .3rem; }