:root {
  --bg-dark: #0f172a;
  --bg-card: #1e293b;
  --bg-card-hover: #334155;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --accent-primary: #3b82f6;
  --accent-success: #10b981;
  --accent-warning: #f59e0b;
  --accent-danger: #ef4444;
  --border-color: #334155;
  --font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

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

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-family);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
header {
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.brand-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, #3b82f6, #1d4ed8);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: bold;
}

.brand-title h1 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.brand-title span {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.live-badge {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(16, 185, 129, 0.1);
  color: var(--accent-success);
  padding: 0.4rem 0.8rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-success);
  border-radius: 50%;
  animation: pulse 1.5s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.user-badge {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Alarm Banner */
.alarm-banner {
  display: none;
  background: linear-gradient(90deg, #b91c1c, #ef4444);
  color: white;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  animation: alarmPulse 1s infinite alternate;
}

@keyframes alarmPulse {
  0% { background: #b91c1c; }
  100% { background: #ef4444; }
}

/* Container */
.container {
  max-width: 1300px;
  margin: 0 auto;
  padding: 2rem;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* Grid Layout */
.dashboard-grid {
  display: grid;
  grid-template-columns: 1.2fr 1.8fr;
  gap: 2rem;
}

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

/* Cards */
.card {
  background-color: var(--bg-card);
  border-radius: 16px;
  padding: 1.5rem;
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
}

.card-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Main Lock Status Display */
.lock-hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 2rem 1rem;
}

.lock-avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  margin-bottom: 1.5rem;
  transition: all 0.3s ease;
}

.state-locked .lock-avatar {
  background: rgba(16, 185, 129, 0.15);
  border: 4px solid var(--accent-success);
  color: var(--accent-success);
  box-shadow: 0 0 30px rgba(16, 185, 129, 0.2);
}

.state-unlocked .lock-avatar {
  background: rgba(245, 158, 11, 0.15);
  border: 4px solid var(--accent-warning);
  color: var(--accent-warning);
  box-shadow: 0 0 30px rgba(245, 158, 11, 0.2);
}

.state-offline .lock-avatar {
  background: rgba(239, 68, 68, 0.15);
  border: 4px solid var(--accent-danger);
  color: var(--accent-danger);
}

.lock-status-text {
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: 1px;
  margin-bottom: 0.5rem;
}

.lock-device-name {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.telemetry-row {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 2rem;
  background: rgba(255, 255, 255, 0.03);
  padding: 0.75rem 1.5rem;
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

.telemetry-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.telemetry-item strong {
  color: var(--text-main);
}

.btn-lock-toggle {
  width: 100%;
  max-width: 280px;
  padding: 1rem 1.5rem;
  border-radius: 12px;
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  transition: all 0.2s ease;
}

.btn-lock-toggle:hover {
  transform: translateY(-2px);
  filter: brightness(1.1);
}

.btn-lock-toggle:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn-lock-action {
  background: linear-gradient(135deg, #10b981, #059669);
  color: white;
}

.btn-unlock-action {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: white;
}

/* Security Modes */
.modes-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.mode-btn {
  background: var(--bg-card-hover);
  border: 2px solid transparent;
  color: var(--text-muted);
  padding: 1rem 0.5rem;
  border-radius: 12px;
  cursor: pointer;
  text-align: center;
  transition: all 0.2s ease;
}

.mode-btn:hover {
  background: #3e4f68;
}

.mode-btn.active {
  border-color: var(--accent-primary);
  background: rgba(59, 130, 246, 0.15);
  color: white;
}

.mode-btn .icon {
  font-size: 1.5rem;
  margin-bottom: 0.25rem;
}

.mode-btn .label {
  font-size: 0.85rem;
  font-weight: 600;
}

/* Sensors Grid */
.sensors-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}

.sensor-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.sensor-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.sensor-name {
  font-size: 0.9rem;
  font-weight: 600;
}

.sensor-badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: 8px;
}

.badge-green { background: rgba(16, 185, 129, 0.15); color: var(--accent-success); }
.badge-red { background: rgba(239, 68, 68, 0.15); color: var(--accent-danger); }
.badge-blue { background: rgba(59, 130, 246, 0.15); color: var(--accent-primary); }

.sensor-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.btn-sim {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--accent-primary);
  padding: 0.3rem 0.6rem;
  border-radius: 6px;
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-sim:hover {
  background: rgba(59, 130, 246, 0.1);
}

/* RFID Cards List */
.rfid-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.rfid-item {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 0.8rem 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.rfid-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.rfid-icon {
  font-size: 1.3rem;
}

.rfid-label {
  font-weight: 600;
  font-size: 0.9rem;
}

.rfid-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* History Table */
.table-responsive {
  overflow-x: auto;
}

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

th {
  background: rgba(255, 255, 255, 0.03);
  padding: 0.75rem 1rem;
  color: var(--text-muted);
  font-weight: 600;
  border-bottom: 1px solid var(--border-color);
}

td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

.event-badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.5rem;
  border-radius: 6px;
}

.badge-locked { background: rgba(16, 185, 129, 0.2); color: var(--accent-success); }
.badge-unlocked { background: rgba(245, 158, 11, 0.2); color: var(--accent-warning); }
.badge-alarm { background: rgba(239, 68, 68, 0.2); color: var(--accent-danger); }
.badge-offline { background: rgba(100, 116, 139, 0.2); color: #cbd5e1; }

/* Modal */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  z-index: 200;
  align-items: center;
  justify-content: center;
}

.modal-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  width: 90%;
  max-width: 450px;
  padding: 2rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.form-group input {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  color: white;
  border-radius: 8px;
  font-size: 0.95rem;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 1rem;
  margin-top: 1.5rem;
}

.btn-secondary {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 0.6rem 1.2rem;
  border-radius: 8px;
  cursor: pointer;
}

.btn-primary {
  background: var(--accent-primary);
  border: none;
  color: white;
  padding: 0.6rem 1.2rem;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
}