:root {
  --bg: #0f0f1a;
  --card-bg: #1a1a2e;
  --card-hover: #1f1f38;
  --border: #2a2a44;
  --text: #e0e0e0;
  --text-dim: #8888a8;
  --text-muted: #5a5a7a;
  --critical: #ff4757;
  --warning: #ffa502;
  --info: #1e90ff;
  --resolved: #2ed573;
  --silenced: #7f8c8d;
  --btn-5m: #2ed573;
  --btn-15m: #1e90ff;
  --btn-1h: #ffa502;
  --btn-3h: #ff6348;
  --btn-1j: #ff4757;
  --radius: 10px;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  min-height: 100dvh;
  padding-top: var(--safe-top);
  padding-bottom: var(--safe-bottom);
  -webkit-font-smoothing: antialiased;
}

/* Header */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: rgba(15, 15, 26, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo { color: var(--resolved); }

h1 {
  font-size: 1.15em;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.header-sub {
  font-weight: 400;
  color: var(--text-dim);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.dot-connected {
  background: var(--resolved);
  box-shadow: 0 0 6px var(--resolved);
}

.dot-disconnected {
  background: var(--critical);
  box-shadow: 0 0 6px var(--critical);
  animation: pulse-dot 1.5s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.conn-text {
  font-size: 0.75em;
  color: var(--text-dim);
}

.btn-header {
  background: var(--border);
  color: var(--text-dim);
  border: none;
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 0.8em;
  cursor: pointer;
  transition: background 0.15s;
}

.btn-header:hover { background: #3a3a5c; color: var(--text); }

/* Main */
main {
  max-width: 720px;
  margin: 0 auto;
  padding: 12px 12px 80px;
}

/* Empty state */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 80px 20px;
  text-align: center;
  color: var(--text-muted);
}

.empty-state p { margin-top: 12px; font-size: 1.05em; }
.empty-sub { font-size: 0.85em !important; color: var(--text-muted); }

/* Alert card */
.alert-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  border-left: 4px solid var(--border);
  margin-bottom: 10px;
  overflow: hidden;
  transition: transform 0.1s, box-shadow 0.15s;
}

.alert-card:active { transform: scale(0.995); }
.alert-card.severity-critical { border-left-color: var(--critical); }
.alert-card.severity-warning { border-left-color: var(--warning); }
.alert-card.status-resolved { border-left-color: var(--resolved); opacity: 0.6; }
.alert-card.status-silenced { border-left-color: var(--silenced); opacity: 0.7; }

/* Card header */
.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding: 14px 14px 0;
  gap: 8px;
}

.card-title {
  font-size: 0.95em;
  font-weight: 600;
  line-height: 1.3;
  flex: 1;
}

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.7em;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  white-space: nowrap;
  flex-shrink: 0;
}

.badge-critical { background: rgba(255,71,87,0.2); color: var(--critical); }
.badge-warning { background: rgba(255,165,2,0.2); color: var(--warning); }
.badge-resolved { background: rgba(46,213,115,0.2); color: var(--resolved); }
.badge-silenced { background: rgba(127,140,141,0.2); color: var(--silenced); }

/* Card meta */
.card-meta {
  display: flex;
  gap: 12px;
  padding: 6px 14px;
  font-size: 0.78em;
  color: var(--text-dim);
}

.card-meta span { display: flex; align-items: center; gap: 4px; }

/* Diagnosis */
.card-diagnosis {
  padding: 0 14px;
  margin-top: 6px;
}

.diagnosis-text {
  font-size: 0.82em;
  line-height: 1.55;
  color: var(--text-dim);
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 4.65em;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.diagnosis-text.expanded {
  max-height: none;
}

.btn-expand {
  display: inline-block;
  background: none;
  border: none;
  color: var(--info);
  font-size: 0.78em;
  cursor: pointer;
  padding: 4px 0;
  margin-top: 2px;
}

.btn-expand:hover { text-decoration: underline; }

/* Status message */
.card-status {
  padding: 8px 14px;
  font-size: 0.82em;
  font-weight: 600;
}

.card-status.status-silenced-msg { color: var(--silenced); }
.card-status.status-resolved-msg { color: var(--resolved); }

/* Ack buttons */
.ack-bar {
  display: flex;
  gap: 6px;
  padding: 10px 14px 14px;
}

.btn-ack {
  flex: 1;
  padding: 10px 4px;
  border: none;
  border-radius: 8px;
  font-size: 0.82em;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.1s, opacity 0.15s;
  color: #fff;
  position: relative;
}

.btn-ack:active { transform: scale(0.94); }
.btn-ack:disabled { opacity: 0.3; cursor: default; transform: none; }

.btn-ack[data-dur="5m"] { background: var(--btn-5m); color: #1a1a2e; }
.btn-ack[data-dur="15m"] { background: var(--btn-15m); }
.btn-ack[data-dur="1h"] { background: var(--btn-1h); color: #1a1a2e; }
.btn-ack[data-dur="3h"] { background: var(--btn-3h); }
.btn-ack[data-dur="1j"] { background: var(--btn-1j); }

/* Loading spinner on ack button */
.btn-ack.loading {
  color: transparent;
}

.btn-ack.loading::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 16px;
  height: 16px;
  margin: -8px 0 0 -8px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Responsive */
@media (max-width: 400px) {
  .ack-bar { gap: 4px; }
  .btn-ack { padding: 10px 2px; font-size: 0.75em; }
  .card-header { padding: 12px 12px 0; }
  .card-meta { padding: 6px 12px; }
  .card-diagnosis { padding: 0 12px; }
  .ack-bar { padding: 8px 12px 12px; }
}