:root {
  --bg-dark: #0f172a;
  --card-bg: #1e293b;
  --card-border: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --danger: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.15);
  --warning: #f59e0b;
  --warning-bg: rgba(245, 158, 11, 0.15);
  --success: #10b981;
  --success-bg: rgba(16, 185, 129, 0.15);
  --accent-cyan: #06b6d4;
  --accent-purple: #8b5cf6;
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.2), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
}

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

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header Navbar */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  background-color: var(--card-bg);
  border-bottom: 1px solid var(--card-border);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.logo-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--primary), var(--accent-purple));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: #fff;
  box-shadow: 0 2px 10px rgba(59, 130, 246, 0.4);
}

.brand-text h1 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-text .sub-text {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

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

.status-pill {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.85rem;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 600;
}

.status-pill.online {
  background: var(--success-bg);
  color: var(--success);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.status-pill.offline {
  background: rgba(148, 163, 184, 0.1);
  color: var(--text-muted);
  border: 1px solid var(--card-border);
}

.status-pill.simulation {
  background: var(--warning-bg);
  color: var(--warning);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: currentColor;
}

.status-pill.online .status-dot {
  animation: pulse 1.5s infinite;
}

.time-box {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  color: var(--text-secondary);
  background: rgba(15, 23, 42, 0.6);
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--card-border);
}

/* Obstacle Alert Banner */
.alert-banner {
  background: linear-gradient(90deg, #b91c1c, #ef4444);
  color: white;
  padding: 0.75rem 2rem;
  display: flex;
  justify-content: center;
  align-items: center;
  animation: slideDown 0.3s ease;
  transition: all 0.3s ease;
}

.alert-banner.hidden {
  display: none;
}

.alert-content {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.warning-icon {
  font-size: 1.4rem;
  animation: bounce 1s infinite;
}

/* Dashboard Grid Layout */
.dashboard-grid {
  padding: 1.5rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  max-width: 1600px;
  margin: 0 auto;
  width: 100%;
}

/* Metric Cards Grid */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}

.metric-card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.metric-card:hover {
  transform: translateY(-2px);
  border-color: #475569;
}

.metric-card.alert-active {
  border-color: var(--danger);
  box-shadow: 0 0 15px rgba(239, 68, 68, 0.3);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1rem;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.header-left h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}

.metric-label {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.icon-wrap {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.heart-wrap { background: rgba(239, 68, 68, 0.15); color: var(--danger); }
.oxygen-wrap { background: rgba(6, 182, 212, 0.15); color: var(--accent-cyan); }
.distance-wrap { background: rgba(59, 130, 246, 0.15); color: var(--primary); }
.buzzer-wrap { background: rgba(245, 158, 11, 0.15); color: var(--warning); }
.buzzer-wrap.active { background: var(--danger); color: #fff; animation: pulse 0.8s infinite; }

.tag {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: 9999px;
  text-transform: uppercase;
}

.tag-normal { background: var(--success-bg); color: var(--success); }
.tag-warning { background: var(--warning-bg); color: var(--warning); }
.tag-danger { background: var(--danger-bg); color: var(--danger); }
.tag-clear { background: var(--success-bg); color: var(--success); }
.tag-muted { background: rgba(148, 163, 184, 0.1); color: var(--text-muted); }

.value-display {
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
  margin-bottom: 0.5rem;
}

.num-large {
  font-family: 'JetBrains Mono', monospace;
  font-size: 2.25rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.03em;
}

.unit {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.card-footer-info {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.progress-bar-bg {
  width: 100%;
  height: 6px;
  background-color: #334155;
  border-radius: 9999px;
  overflow: hidden;
  margin-top: 0.5rem;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-cyan), var(--primary));
  transition: width 0.4s ease;
}

.proximity-indicator {
  width: 100%;
  height: 6px;
  background-color: #334155;
  border-radius: 9999px;
  overflow: hidden;
  margin-top: 0.5rem;
}

.proximity-bar {
  height: 100%;
  background: var(--success);
  transition: width 0.3s ease, background-color 0.3s ease;
}

/* Map Section */
.map-section {
  width: 100%;
}

.map-card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.map-card-header {
  padding: 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  border-bottom: 1px solid var(--card-border);
}

.map-header-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.map-header-left h2 {
  font-size: 1.1rem;
  font-weight: 600;
}

.map-pin-icon {
  font-size: 1.5rem;
  color: var(--danger);
}

.gps-details-row {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.gps-stat {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
  color: var(--text-secondary);
  background: rgba(15, 23, 42, 0.5);
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--card-border);
}

.gps-stat b {
  color: var(--text-primary);
  font-family: 'JetBrains Mono', monospace;
}

.map-container {
  height: 440px;
  width: 100%;
  z-index: 10;
}

/* Bottom Grid (Pinout & Logs) */
.bottom-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 1.25rem;
}

@media (max-width: 900px) {
  .bottom-grid {
    grid-template-columns: 1fr;
  }
}

.info-card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
}

.info-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  gap: 0.5rem;
}

.info-card-header h3 {
  font-size: 0.95rem;
  font-weight: 600;
  flex-grow: 1;
}

.pinout-table-wrap {
  overflow-x: auto;
}

.pinout-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  text-align: left;
}

.pinout-table th {
  color: var(--text-secondary);
  border-bottom: 1px solid var(--card-border);
  padding: 0.6rem 0.5rem;
  font-weight: 500;
}

.pinout-table td {
  padding: 0.6rem 0.5rem;
  border-bottom: 1px solid rgba(51, 65, 85, 0.5);
  color: var(--text-primary);
}

.pin-badge {
  display: inline-block;
  background: rgba(59, 130, 246, 0.15);
  color: var(--primary);
  padding: 0.2rem 0.45rem;
  border-radius: var(--radius-sm);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  margin-right: 0.25rem;
}

.log-container {
  background: #0b1120;
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 0.75rem;
  height: 180px;
  overflow-y: auto;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.log-entry {
  display: flex;
  gap: 0.6rem;
  line-height: 1.4;
}

.log-time {
  color: var(--text-muted);
}

.log-msg {
  color: var(--text-secondary);
}

.log-entry.log-alert .log-msg { color: var(--danger); font-weight: 600; }
.log-entry.log-success .log-msg { color: var(--success); }
.log-entry.log-info .log-msg { color: var(--accent-cyan); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.9rem;
  font-size: 0.82rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-secondary {
  background: #334155;
  color: #fff;
}

.btn-secondary:hover {
  background: #475569;
}

.btn-secondary.active {
  background: var(--warning);
  color: #000;
}

.btn-outline {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--card-border);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.05);
  color: #fff;
}

.btn-xs {
  padding: 0.2rem 0.5rem;
  font-size: 0.7rem;
}

.btn-sm {
  padding: 0.35rem 0.7rem;
  font-size: 0.75rem;
}

/* Animations */
@keyframes pulse {
  0% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.2); opacity: 0.7; }
  100% { transform: scale(1); opacity: 1; }
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

@keyframes slideDown {
  from { transform: translateY(-100%); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.heart-beat-anim {
  animation: pulse 1s infinite ease-in-out;
}