:root {
  --bg-start: #eef2ff;
  --bg-mid: #f7f8fb;
  --bg-end: #ffffff;
  --text-primary: #1f2937;
  --text-muted: #64748b;
  --card-bg: rgba(255, 255, 255, 0.78);
  --card-border: rgba(148, 163, 184, 0.28);
  --shadow-soft: 0 16px 38px rgba(79, 70, 229, 0.09);
  --radius-xl: 22px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Inter", "Segoe UI", Arial, sans-serif;
  background: linear-gradient(
    140deg,
    var(--bg-start) 0%,
    var(--bg-mid) 55%,
    var(--bg-end) 100%
  );
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(148, 163, 184, 0.22);
  box-shadow: 0 6px 18px rgba(15, 23, 42, 0.08);
}

.header-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.header-title {
  margin: 0;
  font-size: 26px;
  font-weight: 600;
}

.header-tagline {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: #6366f1;
}

.header-link {
  font-size: 13px;
  color: var(--text-muted);
  transition: color 0.2s ease;
}

.header-link:hover {
  color: #334155;
}

@media (max-width: 640px) {
  .header-link {
    display: none;
  }
}

main {
  max-width: 1080px;
  margin: 0 auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

@media (min-width: 1200px) {
  main {
    padding: 28px 0 32px;
  }
}

.dashboard-top {
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(0, 1fr);
  align-items: stretch;
}

@media (min-width: 960px) {
  .dashboard-top {
    grid-template-columns: minmax(0, 1.55fr) 300px;
  }
}

.card {
  position: relative;
  border-radius: var(--radius-xl);
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
  backdrop-filter: blur(12px);
}

.card--primary {
  padding: 22px 24px;
}

.card--primary::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
    circle at top,
    rgba(99, 102, 241, 0.12),
    transparent 63%
  );
  pointer-events: none;
}

.card__content {
  position: relative;
  z-index: 1;
}

.device-row {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
}

.device-row__label,
.status-label {
  margin: 0;
  font-size: 13px;
  color: var(--text-muted);
}

.device-row__controls {
  margin-top: 6px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.device-input {
  width: 120px;
  padding: 8px 10px;
  border-radius: 12px;
  border: 1px solid rgba(148, 163, 184, 0.45);
  background: rgba(255, 255, 255, 0.92);
  font-family: "Roboto Mono", Consolas, monospace;
  font-size: 12px;
  color: #475569;
}

.device-input--locked {
  background: rgba(244, 246, 252, 0.9);
  cursor: not-allowed;
}

.btn {
  border: none;
  border-radius: 16px;
  padding: 8px 18px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: background 0.2s ease, box-shadow 0.2s ease, transform 0.15s ease;
}

.btn--primary {
  background: #4f46e5;
  color: #ffffff;
  box-shadow: 0 12px 18px rgba(79, 70, 229, 0.22);
}

.btn--primary:hover {
  background: #4338ca;
}

.btn--ghost {
  width: 100%;
  background: rgba(255, 255, 255, 0.9);
  color: #475569;
  border: 1px solid rgba(148, 163, 184, 0.35);
}

.btn--ghost:hover {
  background: #ffffff;
}

.btn--compact {
  padding: 7px 14px;
}

@media (max-width: 700px) {
  #connectBtn {
    display: none;
  }
}

.status-wrapper {
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-items: flex-end;
}

.status-label-row {
  display: flex;
  align-items: center;
  gap: 8px;
  position: relative;
}

.status-indicator {
  --indicator-color: #ef4444;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 12px;
  border-radius: 14px;
  border: 1px solid rgba(148, 163, 184, 0.35);
  background: rgba(255, 255, 255, 0.88);
  min-width: 150px;
}

.status-indicator__dot {
  position: relative;
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--indicator-color);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.status-indicator__pulse {
  position: absolute;
  width: 18px;
  height: 18px;
  border-radius: 999px;
  background: var(--indicator-color);
  opacity: 0;
  transform: scale(0.5);
}

.status-indicator--active .status-indicator__pulse {
  opacity: 0.55;
  animation: pulse 1.8s ease-out infinite;
}

.status-indicator__text {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  text-transform: lowercase;
}

@keyframes pulse {
  0% {
    transform: scale(0.5);
    opacity: 0.55;
  }
  70% {
    transform: scale(1.5);
    opacity: 0;
  }
  100% {
    transform: scale(1.5);
    opacity: 0;
  }
}

.metrics-grid {
  margin-top: 20px;
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
}

.metric-card {
  padding: 16px;
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, 0.65);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 12px 24px rgba(15, 23, 42, 0.07);
  height: 100%;
}

.metric-card--accent {
  padding: 20px 24px;
  background: linear-gradient(
    160deg,
    rgba(99, 102, 241, 0.16),
    rgba(99, 102, 241, 0)
  );
}

.metric-label {
  margin: 0;
  font-size: 13px;
  color: var(--text-muted);
}

.metric-value {
  margin: 4px 0 0;
  font-size: 32px;
  font-weight: 600;
  line-height: 1.1;
}

.metric-value--xl {
  font-size: 42px;
}

.metrics-grid--primary {
  grid-template-columns: minmax(0, 1fr);
  align-items: stretch;
}

@media (min-width: 900px) {
  .metrics-grid--primary {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  }
}

.metric-card--compact {
  padding: 16px 18px;
}

.metric-card--crowded {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.metric-card--rolling {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.metric-subgrid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
}

.crowded-body {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 22px;
}

.crowded-gauge-wrap {
  flex: 1 1 260px;
  min-width: 200px;
  display: flex;
  align-items: center;
}

.crowded-gauge {
  width: 100%;
  height: auto;
  max-width: none;
}

.crowded-meta {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.crowded-meta .metric-footer {
  margin: 0;
}

.crowded-chip {
  display: inline-flex;
  padding: 6px 14px;
  border-radius: 999px;
  color: #ffffff;
  font-weight: 600;
  font-size: 14px;
  background: #6b7280;
  letter-spacing: 0.02em;
}

.rolling-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
  align-items: end;
}

.rolling-item .metric-value {
  font-size: 28px;
}

.info-card {
  padding: 22px 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.info-title {
  margin: 0;
  font-size: 14px;
  color: var(--text-muted);
}

.info-subtitle {
  margin: 4px 0 0;
  font-size: 17px;
  font-weight: 600;
  color: var(--text-primary);
}

.info-list {
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  color: var(--text-muted);
  font-size: 12px;
}

.info-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.info-item span {
  display: inline-flex;
  width: 9px;
  height: 9px;
  margin-top: 4px;
  border-radius: 999px;
}

.info-item--ok span {
  background: rgba(16, 185, 129, 0.8);
}

.info-item--warn span {
  background: rgba(251, 191, 36, 0.8);
}

.info-item--error span {
  background: rgba(239, 68, 68, 0.8);
}

.info-item p {
  margin: 0;
  line-height: 1.4;
}

.chart-card {
  padding: 22px 24px 26px;
}

.chart-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.chart-title {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.chart-heading {
  margin: 2px 0 0;
  font-size: 18px;
  font-weight: 600;
}

.chart-copy {
  max-width: 360px;
  font-size: 12px;
  color: var(--text-muted);
  margin: 0;
}

.chart-body {
  position: relative;
  height: 220px;
}

canvas {
  width: 100% !important;
  height: 100% !important;
}

.tooltip-trigger,
.status-tooltip-trigger {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  color: #6366f1;
  font-size: 12px;
  font-weight: 600;
}
.tooltip-trigger svg,
.status-tooltip-trigger svg {
  opacity: 0.7;
  transition: opacity 0.2s ease;
}
.tooltip-trigger:hover svg,
.status-tooltip-trigger:hover svg {
  opacity: 1;
}
.tooltip-trigger:focus-visible,
.status-tooltip-trigger:focus-visible {
  outline: 2px solid rgba(99, 102, 241, 0.4);
  outline-offset: 4px;
}

.tooltip-bubble {
  position: absolute;
  top: 120%;
  right: 0;
  width: 260px;
  max-width: 70vw;
  padding: 14px 16px;
  border-radius: 12px;
  background: rgba(15, 23, 42, 0.92);
  color: #e2e8f0;
  box-shadow: 0 18px 30px rgba(15, 23, 42, 0.2);
  transform: translateY(8px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 30;
}

.tooltip-bubble[data-open="true"] {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.tooltip-bubble--status {
  top: 100%;
  right: 0;
  transform: translateY(6px);
}

.tooltip-bubble ul {
  margin: 0;
  padding-left: 18px;
  font-size: 12px;
  line-height: 1.45;
}

.tooltip-bubble ul li + li {
  margin-top: 6px;
}

.tooltip-title {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #cbd5f5;
}

.btn--mini {
  margin-top: 14px;
  padding: 6px 12px;
  font-size: 11px;
  width: 100%;
}

.carbon-guidelines {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.carbon-guidelines__item {
  display: grid;
  grid-template-columns: minmax(0, 150px) minmax(0, 1fr);
  gap: 12px;
  align-items: center;
}

.carbon-guidelines__level {
  display: inline-flex;
  justify-content: center;
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  background: rgba(148, 163, 184, 0.22);
  color: #475569;
  text-align: center;
}

.carbon-guidelines__level--good {
  background: rgba(16, 185, 129, 0.18);
  color: #0f766e;
}

.carbon-guidelines__level--watch {
  background: rgba(234, 179, 8, 0.18);
  color: #b45309;
}

.carbon-guidelines__level--warn {
  background: rgba(249, 115, 22, 0.18);
  color: #c2410c;
}

.carbon-guidelines__level--alert {
  background: rgba(239, 68, 68, 0.18);
  color: #b91c1c;
}

.carbon-guidelines__item p {
  margin: 0;
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
}

.info-note {
  margin: 0;
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.5;
}

@media (max-width: 540px) {
  main {
    padding: 20px;
  }

  .card--primary,
  .info-card,
  .chart-card {
    padding: 18px;
  }

  .metrics-grid--primary {
    grid-template-columns: minmax(0, 1fr);
  }

  .metric-value {
    font-size: 28px;
  }

  .metric-value--xl {
    font-size: 34px;
  }
}