* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, "PingFang SC", sans-serif; background: #f4f5f7; color: #222; }
header { display: flex; align-items: center; gap: 12px; padding: 14px 20px; background: #1f2937; color: #fff; }
header h1 { font-size: 18px; }
.conn { font-size: 12px; padding: 2px 8px; border-radius: 10px; background: #6b7280; }
.conn.ok { background: #10b981; }
main { display: flex; height: calc(100vh - 52px); }
.sidebar { width: 280px; background: #fff; border-right: 1px solid #e5e7eb; padding: 12px; overflow-y: auto; }
.add-row { display: flex; gap: 6px; margin-bottom: 12px; }
.add-row input { flex: 1; padding: 6px; border: 1px solid #d1d5db; border-radius: 4px; }
button { cursor: pointer; border: none; border-radius: 4px; padding: 6px 10px; background: #2563eb; color: #fff; font-size: 13px; }
button:hover { opacity: .9; }
button.gray { background: #6b7280; }
button.red { background: #dc2626; }
button.green { background: #10b981; }
#meterList { list-style: none; }
#meterList li { padding: 10px; border-radius: 6px; cursor: pointer; margin-bottom: 6px; border: 1px solid #e5e7eb; }
#meterList li.active { border-color: #2563eb; background: #eff6ff; }
#meterList li .uid { font-weight: 600; font-size: 13px; }
#meterList li .uid-sub { font-size: 11px; color: #9ca3af; margin-top: 2px; }
#meterList li .meta { font-size: 12px; color: #6b7280; margin-top: 4px; }
.dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 4px; }
.dot.on { background: #10b981; } .dot.off { background: #9ca3af; } .dot.err { background: #dc2626; }
.detail { flex: 1; padding: 24px; overflow-y: auto; }
.empty { color: #9ca3af; }
.card { background: #fff; border-radius: 8px; padding: 20px; max-width: 640px; box-shadow: 0 1px 3px rgba(0,0,0,.1); }
.reading { font-size: 40px; font-weight: 700; color: #2563eb; }
.reading small { font-size: 16px; color: #6b7280; }
.fields { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 16px; margin: 16px 0; font-size: 13px; }
.fields .k { color: #6b7280; }
.actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; padding-top: 16px; border-top: 1px solid #eee; }
.actions input { width: 90px; padding: 6px; border: 1px solid #d1d5db; border-radius: 4px; }
.badge { font-size: 12px; padding: 2px 8px; border-radius: 10px; }
.badge.err { background: #fee2e2; color: #b91c1c; }
.badge.ok { background: #d1fae5; color: #047857; }
.presets { margin-top: 16px; padding-top: 12px; border-top: 1px dashed #d1d5db; }
.presets-title { font-size: 12px; color: #6b7280; margin-bottom: 4px; }
.presets .actions { margin-top: 6px; padding-top: 6px; border-top: none; }
.presets button { background: #eef2ff; color: #3730a3; }