:root {
  --bg: #f5f6f8; --card: #fff; --fg: #1d2330; --muted: #667085; --border: #dde1e7;
  --accent: #2563eb; --accent-fg: #fff; --danger: #c0262d; --ok-bg: #e7f6ec; --ok-fg: #17663a;
  --err-bg: #fdecec; --err-fg: #9b1c22; --warn-bg: #fff6e0; --warn-fg: #7a5200; --code-bg: #f0f2f5;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151b; --card: #1b2029; --fg: #e4e7ec; --muted: #98a2b3; --border: #2d3440;
    --accent: #4f8cff; --danger: #f0565d; --ok-bg: #12321f; --ok-fg: #7fdca0; --err-bg: #3a1517;
    --err-fg: #ff9a9f; --warn-bg: #3a2c0c; --warn-fg: #ffd27a; --code-bg: #242a35;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 15px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif; }
a { color: var(--accent); }
code, pre { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; }
code { background: var(--code-bg); padding: 1px 5px; border-radius: 4px; word-break: break-all; }
pre { background: var(--code-bg); padding: 12px; border-radius: 6px; overflow-x: auto; white-space: pre; }
header.top { display: flex; align-items: center; gap: 24px; padding: 12px 24px; background: var(--card); border-bottom: 1px solid var(--border); flex-wrap: wrap; }
.brand { font-weight: 700; font-size: 18px; color: var(--fg); text-decoration: none; }
nav { display: flex; gap: 4px; flex-wrap: wrap; flex: 1; }
nav a { padding: 6px 12px; border-radius: 6px; color: var(--muted); text-decoration: none; }
nav a.active, nav a:hover { background: var(--code-bg); color: var(--fg); }
main { max-width: 1100px; margin: 0 auto; padding: 24px 16px 64px; }
h1 { font-size: 24px; margin: 0 0 16px; }
h2 { font-size: 18px; margin: 0 0 12px; }
h3 { font-size: 15px; margin: 20px 0 6px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 20px; margin-bottom: 20px; overflow-x: auto; }
.card.narrow { max-width: 460px; margin: 40px auto; }
.danger-zone { border-color: var(--danger); }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { font-size: 13px; color: var(--muted); font-weight: 600; }
table.compact td, table.compact th { padding: 5px 8px; font-size: 14px; }
tr.muted td { color: var(--muted); }
td.data code { white-space: pre-wrap; }
td.ua { max-width: 280px; font-size: 12px; color: var(--muted); }
td.actions { display: flex; gap: 6px; }
.nowrap { white-space: nowrap; }
.hint { color: var(--muted); font-size: 13px; }
label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--muted); }
input, select { font: inherit; padding: 7px 10px; border: 1px solid var(--border); border-radius: 6px; background: var(--bg); color: var(--fg); min-width: 0; }
button { font: inherit; padding: 7px 14px; border: 1px solid var(--border); border-radius: 6px; background: var(--code-bg); color: var(--fg); cursor: pointer; }
button:hover { filter: brightness(0.97); }
button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-fg); }
button.danger { background: transparent; border-color: var(--danger); color: var(--danger); }
button.small { padding: 3px 9px; font-size: 13px; }
button.link { background: none; border: none; color: var(--muted); padding: 0; }
button.wide { width: 100%; padding: 10px; }
button:disabled { opacity: .5; cursor: not-allowed; }
form.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; align-items: end; }
form.stack { display: flex; flex-direction: column; gap: 10px; }
.inline { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.span2 { grid-column: span 2; }
@media (max-width: 560px) { .span2 { grid-column: auto; } }
.msg { padding: 10px 14px; border-radius: 8px; margin-bottom: 16px; }
.msg.ok { background: var(--ok-bg); color: var(--ok-fg); }
.msg.err { background: var(--err-bg); color: var(--err-fg); }
.msg.warn { background: var(--warn-bg); color: var(--warn-fg); }
.badge { display: inline-block; padding: 1px 8px; border-radius: 99px; font-size: 12px; background: var(--code-bg); color: var(--muted); }
.badge.dyndns { background: var(--ok-bg); color: var(--ok-fg); }
.badge.acme { background: var(--warn-bg); color: var(--warn-fg); }
.tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; margin-bottom: 20px; }
.tile { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 16px 20px; text-decoration: none; color: var(--fg); display: flex; flex-direction: column; }
.tile strong { font-size: 28px; }
.tile span { color: var(--muted); }
.divider { display: flex; align-items: center; gap: 10px; color: var(--muted); margin: 20px 0; font-size: 13px; }
.divider::before, .divider::after { content: ""; flex: 1; border-top: 1px solid var(--border); }
img.qr { display: block; margin: 12px auto; background: #fff; padding: 8px; border-radius: 8px; }
code.secret { display: block; margin-top: 6px; letter-spacing: 1px; }
dl.kv { display: grid; grid-template-columns: max-content 1fr; gap: 6px 16px; margin: 0; }
dl.kv dt { color: var(--muted); }
dl.kv dd { margin: 0; }
form.logout { margin-left: auto; }