body { 
  font-family: Arial, sans-serif; 
  margin: 0; 
  padding: 1rem;
  background: #10151b; 
  color: #eef; 
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid #333;
}

.header h1 {
  margin: 0;
  color: #eef;
}

.header nav {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.config-link {
  color: #6c757d;
  text-decoration: none;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  transition: background-color 0.2s;
}

.config-link:hover {
  background-color: #2d3748;
  color: #eef;
}

.card { 
  background: #1d2530; 
  padding: 1.5rem; 
  margin: 0.5rem; 
  border-radius: 8px; 
  display: inline-block; 
  vertical-align: top;
  min-width: 320px;
  min-height: 260px;
  position: relative;
  box-shadow: 0 2px 4px rgba(0,0,0,0.3);
  position: relative;
  resize: both; /* fallback native resize for browsers that support */
  overflow: hidden;
}

.highline {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
  margin-bottom: 0.75rem;
}

.badge {
  background: #243140;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 0.7rem;
  letter-spacing: 0.5px;
  color: #cde;
  font-weight: 600;
}

.badge[data-badge="runtime"] { background:#2c3e50; }
.badge[data-badge="watts"] { background:#1f4f61; }
.badge[data-badge="headroom"] { background:#3b3f2a; }
.badge[data-badge="energy"] { background:#28324a; }

/* Battery Gauge */
.gauge { width: 120px; height: 70px; position: relative; }
.gauge svg { width: 100%; height: 100%; }
.gauge-bg { fill: none; stroke: #243140; stroke-width: 10; stroke-linecap: round; }
.gauge-fill { fill: none; stroke: #4a9eff; stroke-width: 10; stroke-linecap: round; transition: stroke-dasharray .4s ease, stroke .4s; }
.gauge-text { fill: #cde; font-size: 16px; font-weight: 600; dominant-baseline: middle; }
.gauge.low .gauge-fill { stroke: #d97745; }
.gauge.critical .gauge-fill { stroke: #d9534f; }
.gauge.good .gauge-fill { stroke: #3bb273; }

.events { margin-top: 0.75rem; }
.events-header { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 1px; opacity: 0.6; margin-bottom: 0.25rem; }
.events-list { list-style: none; padding: 0; margin: 0; max-height: 90px; overflow-y: auto; font-size: 0.65rem; line-height: 1.2; }
.events-list li { padding: 2px 0; border-bottom: 1px solid #233; }
.events-list li:last-child { border-bottom: none; }

.card-header {
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid #333;
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.card h2 { 
  margin: 0 0 0.25rem 0; 
  color: #eef;
}

.ups-connection {
  font-size: 0.8rem;
  color: #999;
}

.metrics { 
  font-size: 0.9rem; 
  padding-bottom: 32px; /* Reserve space for footer */
  position: relative;
}

.metric-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.metric-row > div {
  flex: 1;
}

.val { 
  font-weight: bold; 
  color: #4a9eff;
}

.ups-status {
  display: inline-block;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: bold;
  text-transform: uppercase;
}

.ups-status.online {
  background-color: #155724;
  color: #d4edda;
}

.ups-status.onbattery {
  background-color: #856404;
  color: #fff3cd;
}

.ups-status.unknown {
  background-color: #383d41;
  color: #d6d8db;
}

.charts {
  margin-top: 1rem;
}

#ups-cards { 
  display: flex; 
  flex-wrap: wrap; 
}

canvas.chart { 
  width: 300px; 
  margin-bottom: 0.5rem;
}

.resize-handle {
  position: absolute;
  width: 14px;
  height: 14px;
  right: 4px;
  bottom: 4px;
  background: linear-gradient(135deg, #2f3b48 0%, #3e4c5c 60%, #4a5b6e 100%);
  border: 1px solid #556;
  border-radius: 3px;
  cursor: nwse-resize;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 8px;
  color: #9fb1c3;
  user-select: none;
  opacity: 0.75;
  transition: opacity .15s;
}
.resize-handle:hover { opacity: 1; }

.card.resizing { outline: 1px dashed #4a9eff; }

.empty-state {
  text-align: center;
  padding: 3rem;
  color: #999;
  width: 100%;
}

.empty-state h3 {
  color: #eef;
  margin-bottom: 0.5rem;
}

.empty-state a {
  color: #4a9eff;
  text-decoration: none;
}

.empty-state a:hover {
  text-decoration: underline;
}

/* Mode toggle */
.mode-toggle {
  margin-left: auto;
  background: #2b3542;
  color: #cdd6e2;
  border: 1px solid #3a4756;
  padding: 4px 6px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.7rem;
}
.mode-toggle:hover { background:#364250; }

/* Add Metric Button */
.add-metric-btn { background:#2b3542; color:#9fb1c3; border:1px solid #3a4756; border-radius:4px; cursor:pointer; width:26px; height:26px; font-size:16px; line-height:1; display:flex; align-items:center; justify-content:center; }
.add-metric-btn:hover { background:#364250; }

/* Reset layout button */
.reset-layout-btn { background:#2b3542; color:#9fb1c3; border:1px solid #3a4756; border-radius:4px; cursor:pointer; width:28px; height:26px; font-size:14px; display:flex; align-items:center; justify-content:center; }
.reset-layout-btn:hover { background:#364250; }

/* Metric Modal */
.metric-modal-backdrop { position:fixed; inset:0; background:rgba(0,0,0,0.55); display:flex; align-items:center; justify-content:center; z-index:1000; }
.metric-modal { background:#1d2530; border:1px solid #2c3846; padding:1rem 1.25rem; width:340px; border-radius:8px; box-shadow:0 4px 16px rgba(0,0,0,0.4); }
.metric-modal h3 { margin-top:0; margin-bottom:0.75rem; font-size:1rem; color:#eef; }
.metric-modal label { font-size:0.7rem; text-transform:uppercase; letter-spacing:1px; opacity:0.75; display:block; margin-top:0.75rem; margin-bottom:0.25rem; }
.metric-modal select, .metric-modal input { width:100%; background:#283240; color:#cdd6e2; border:1px solid #364250; border-radius:4px; padding:4px 6px; font-size:0.85rem; }
.metric-modal-actions { display:flex; justify-content:flex-end; gap:0.5rem; margin-top:1rem; }
.metric-modal button { background:#2b3542; border:1px solid #3a4756; color:#cdd6e2; padding:6px 10px; border-radius:4px; cursor:pointer; font-size:0.75rem; }
.metric-modal button.primary { background:#1f5d85; border-color:#2675aa; }
.metric-modal button.primary:hover { background:#2675aa; }
.metric-modal button:hover { background:#364250; }

/* Compact mode */
.card.compact .charts { display: none; }
.card.compact .events { display: none; }
.card.compact { min-height: 140px; }
.card.compact .metric-row { margin-bottom: 0.25rem; }
.card.compact .highline { margin-bottom: 0.4rem; }

/* Tile system */
.tile-grid { position: relative; margin-top: 0.6rem; min-height: 140px; }
.tile { background:#212b36; border:1px solid #2c3a48; border-radius:6px; padding:0.5rem 0.6rem; position:absolute; display:flex; flex-direction:column; min-height:110px; min-width:140px; box-sizing:border-box; }
.tile h4 { margin:0 0 0.4rem 0; font-size:0.7rem; letter-spacing:1px; text-transform:uppercase; opacity:0.7; font-weight:600; }
.tile .tile-body { flex:1; display:flex; align-items:center; justify-content:center; }
.tile .big-value { font-size:1.4rem; font-weight:600; color:#4a9eff; }
.tile canvas { width:100%!important; height:90px!important; }
.tile .gauge { margin:auto; }
.tile-controls { position:absolute; top:4px; right:4px; display:flex; gap:4px; }
.tile-controls select { background:#2b3542; border:1px solid #364250; color:#cdd6e2; font-size:0.6rem; padding:2px 4px; border-radius:4px; }
.tile.small { min-height:80px; }
.tile.hidden { display:none; }
.tile.dragging { opacity:0.5; border:1px dashed #4a9eff; }
.tile.selected { outline:2px solid #4a9eff; }
.tile-resize { position:absolute; right:4px; bottom:4px; width:12px; height:12px; cursor:nwse-resize; background:rgba(255,255,255,0.08); border:1px solid #3a4756; border-radius:2px; }
.tile-resize:after { content:''; position:absolute; right:2px; bottom:2px; width:6px; height:6px; border-right:2px solid #4a9eff; border-bottom:2px solid #4a9eff; }

/* Event footer */
.ups-footer { 
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  font-size: 0.65rem; 
  color: #9fb1c3; 
  border-top: 1px solid #2c3a48; 
  padding: 4px 8px; 
  min-height: 20px; 
  white-space: nowrap; 
  overflow: hidden; 
  background: rgba(29, 37, 48, 0.95);
  border-radius: 0 0 8px 8px;
  z-index: 10;
  box-sizing: border-box;
}
.ups-footer .event-marquee { display: inline-block; animation: marquee 18s linear infinite; }

/* Value tile display */
.big-value-container { 
  text-align: center; 
  display: flex; 
  align-items: baseline; 
  justify-content: center; 
  gap: 4px; 
  height: 100%; 
  padding: 10px;
}
.big-value-container .big-value { 
  font-size: 2rem; 
  font-weight: 600; 
  color: #4a9eff; 
}
.big-value-container .value-unit { 
  font-size: 0.9rem; 
  color: #9fb1c3; 
  font-weight: normal;
}

/* Voltage color coding based on US electrical specs */
.voltage-good { 
  color: #22c55e !important; /* Green for voltage in acceptable range (114V-126V) */
}
.voltage-bad { 
  color: #ef4444 !important; /* Red for voltage out of acceptable range */
}

@keyframes marquee { 0% { transform:translateX(0); } 100% { transform:translateX(-100%); } }
.legend-badge { background:#243140; padding:2px 6px; border-radius:10px; font-size:0.6rem; margin:2px; display:inline-block; }

.card.compact .tile-grid { display:none; }