* { box-sizing: border-box; }
body { font-family: system-ui, sans-serif; margin: 0; background: #11161c; color: #e6e9ef; }
#app { max-width: 720px; margin: 0 auto; padding: 16px; }
h1 { font-size: 1.3rem; }
input, button { font-size: 1rem; padding: 8px; border-radius: 6px; border: 1px solid #333; }
button { background: #2a6df5; color: white; border: none; cursor: pointer; margin: 4px 4px 4px 0; }
button.secondary { background: #444; }
button:disabled { opacity: 0.5; cursor: wait; }
.card { background: #1a212b; border-radius: 10px; padding: 12px; margin-bottom: 10px; }
.device-row { display: flex; align-items: center; gap: 10px; cursor: pointer; }
.dot { width: 12px; height: 12px; border-radius: 50%; display: inline-block; }
.dot.online { background: #30d158; }
.dot.offline { background: #8e8e93; }
.zones { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.zone { padding: 8px; border-radius: 8px; text-align: center; background: #263141; }
.zone.open { background: #b5651d; }
.zone.bypass { background: #5a5a5a; }
.zone.tamper { background: #b00020; }
.trouble { color: #ff9f0a; }
.events { max-height: 220px; overflow-y: auto; font-size: 0.85rem; }
.events div { border-bottom: 1px solid #263141; padding: 4px 0; }
.ack-msg { font-size: 0.85rem; color: #30d158; }
.error { color: #ff453a; }
a.back { color: #9aa5b1; cursor: pointer; }