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

:root {
  --primary-bg: #0f1419;
  --secondary-bg: #1a1f28;
  --tertiary-bg: #252d3a;
  --border-color: #3a4455;
  --text-primary: #e8eaed;
  --text-secondary: #b0b4ba;
  --success: #4ade80;
  --warning: #facc15;
  --danger: #ef4444;
  --info: #F2D01D;
  --info-dark: #FFC107;
  --info-light: #FFF9C4;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--primary-bg);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ===== HEADER ===== */
header {
  background: var(--info);
  border-bottom: none;
  box-shadow: 0 4px 12px rgba(242, 208, 29, 0.2);
  padding: 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 1rem;
  color: #1a1f28;
}

.logo-image {
  height: 50px;
  width: 50px;
  object-fit: contain;
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-main {
  font-size: 1.2rem;
  font-weight: 700;
  color: #000;
}

.logo-subtitle {
  font-size: 0.75rem;
  font-weight: 500;
  color: #333;
}

nav {
  display: flex;
  gap: 1rem;
}

nav button {
  background: transparent;
  border: 2px solid transparent;
  color: #333;
  padding: 0.5rem 1rem;
  cursor: pointer;
  border-radius: 0.375rem;
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition);
}

nav button:hover {
  color: #000;
  border-bottom: 2px solid #333;
}

nav button.active {
  color: #000;
  border-bottom: 2px solid #000;
}

.last-updated {
  font-size: 0.85rem;
  color: #333;
  font-weight: 500;
}

/* ===== MAIN CONTAINER ===== */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem;
}

/* ===== SCREEN VISIBILITY ===== */
.screen {
  display: none;
}

.screen.active {
  display: block;
  animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== SCREEN 1: FLEET OVERVIEW ===== */
.kpi-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.kpi-card {
  background: var(--secondary-bg);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  padding: 1.5rem;
  text-align: center;
  transition: var(--transition);
}

.kpi-card:hover {
  border-color: var(--info);
  transform: translateY(-2px);
}

.kpi-value {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--info);
  margin-bottom: 0.5rem;
}

.kpi-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Search & Filter */
.controls {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.search-box {
  flex: 1;
  min-width: 250px;
  background: var(--secondary-bg);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  padding: 0.75rem 1rem;
  color: var(--text-primary);
  font-size: 1rem;
}

.search-box:focus {
  outline: none;
  border-color: var(--info);
}

.filter-buttons {
  display: flex;
  gap: 0.5rem;
}

.filter-btn {
  background: var(--secondary-bg);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.75rem 1.25rem;
  border-radius: 0.5rem;
  cursor: pointer;
  font-size: 0.9rem;
  transition: var(--transition);
}

.filter-btn:hover {
  border-color: var(--info);
  color: var(--info);
}

.filter-btn.active {
  background: var(--info);
  color: var(--primary-bg);
  border-color: var(--info);
}

/* Site Cards Grid */
.sites-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.site-card {
  background: var(--secondary-bg);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  padding: 1.5rem;
  cursor: pointer;
  transition: var(--transition);
}

.site-card:hover {
  transform: translateY(-4px);
  border-color: var(--info);
  box-shadow: 0 8px 24px rgba(59, 130, 246, 0.1);
}

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

.site-name {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.site-location {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  padding: 0.4rem 0.8rem;
  border-radius: 0.375rem;
  font-weight: 600;
}

.status-healthy {
  background: rgba(74, 222, 128, 0.15);
  color: var(--success);
}

.status-at-risk {
  background: rgba(250, 204, 21, 0.15);
  color: var(--warning);
}

.status-critical {
  background: rgba(239, 68, 68, 0.15);
  color: var(--danger);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
}

.site-type {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.health-bar-container {
  margin-bottom: 1rem;
}

.health-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

.health-bar {
  width: 100%;
  height: 8px;
  background: var(--tertiary-bg);
  border-radius: 4px;
  overflow: hidden;
}

.health-bar-fill {
  height: 100%;
  border-radius: 4px;
  transition: width 0.5s ease;
}

.health-fill-healthy {
  background: linear-gradient(90deg, var(--success), #22c55e);
}

.health-fill-at-risk {
  background: linear-gradient(90deg, var(--warning), #eab308);
}

.health-fill-critical {
  background: linear-gradient(90deg, var(--danger), #dc2626);
}

.alert-indicator {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.8rem;
}

.alert-indicator.has-alerts {
  color: var(--danger);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.7;
  }
}

/* ===== SCREEN 2: SITE DETAIL ===== */
.site-detail-header {
  background: var(--secondary-bg);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  padding: 2rem;
  margin-bottom: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: start;
}

.site-detail-info h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.site-detail-info p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.detail-health-display {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.detail-health-score {
  font-size: 2.5rem;
  font-weight: 700;
}

.back-btn {
  background: var(--secondary-bg);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  cursor: pointer;
  font-size: 0.95rem;
  transition: var(--transition);
}

.back-btn:hover {
  border-color: var(--info);
  color: var(--info);
}

.asset-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.asset-card {
  background: var(--secondary-bg);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  padding: 1.5rem;
  transition: var(--transition);
}

.asset-card:hover {
  border-color: var(--info);
}

.asset-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.asset-item {
  display: flex;
  justify-content: space-between;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.9rem;
}

.asset-item:last-child {
  border-bottom: none;
}

.asset-label {
  color: var(--text-secondary);
}

.asset-value {
  font-weight: 600;
  color: var(--text-primary);
}

.asset-status {
  padding: 0.3rem 0.8rem;
  border-radius: 0.25rem;
  font-size: 0.8rem;
  font-weight: 600;
}

.status-on {
  background: rgba(74, 222, 128, 0.15);
  color: var(--success);
}

.status-off {
  background: rgba(229, 231, 235, 0.1);
  color: var(--text-secondary);
}

/* Alerts Panel */
.alerts-panel {
  background: var(--secondary-bg);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.alerts-title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.alerts-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.alert-item {
  background: var(--tertiary-bg);
  border-left: 4px solid;
  border-radius: 0.25rem;
  padding: 1rem;
  transition: var(--transition);
}

.alert-critical {
  border-left-color: var(--danger);
}

.alert-warning {
  border-left-color: var(--warning);
}

.alert-info {
  border-left-color: var(--info);
}

.alert-header {
  display: flex;
  justify-content: space-between;
  align-items: start;
  margin-bottom: 0.5rem;
}

.alert-severity {
  padding: 0.25rem 0.75rem;
  border-radius: 0.25rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
}

.severity-critical {
  background: rgba(239, 68, 68, 0.2);
  color: var(--danger);
}

.severity-warning {
  background: rgba(250, 204, 21, 0.2);
  color: var(--warning);
}

.severity-info {
  background: rgba(59, 130, 246, 0.2);
  color: var(--info);
}

.alert-message {
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

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

.no-alerts {
  text-align: center;
  padding: 2rem;
  color: var(--text-secondary);
}

.no-alerts-success {
  color: var(--success);
  font-size: 1.1rem;
}

/* ===== SCREEN 3: INSIGHTS ===== */
.insights-grid {
  display: grid;
  gap: 2rem;
}

.insights-section {
  background: var(--secondary-bg);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  padding: 1.5rem;
}

.section-title {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.summary-text {
  color: var(--text-primary);
  line-height: 1.8;
  margin-bottom: 1rem;
}

.recommendations-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.recommendation-item {
  background: var(--tertiary-bg);
  border: 1px solid var(--border-color);
  border-radius: 0.375rem;
  padding: 1.25rem;
  transition: var(--transition);
}

.recommendation-item:hover {
  border-color: var(--info);
  transform: translateX(4px);
}

.rec-header {
  display: flex;
  justify-content: space-between;
  align-items: start;
  margin-bottom: 0.75rem;
}

.rec-title {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 1rem;
}

.rec-priority {
  padding: 0.3rem 0.75rem;
  border-radius: 0.25rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
}

.priority-high {
  background: rgba(239, 68, 68, 0.2);
  color: var(--danger);
}

.priority-medium {
  background: rgba(250, 204, 21, 0.2);
  color: var(--warning);
}

.priority-low {
  background: rgba(59, 130, 246, 0.2);
  color: var(--info);
}

.rec-description {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

.event-log {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  position: relative;
  padding-left: 2rem;
}

.event-log::before {
  content: '';
  position: absolute;
  left: 0.5rem;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--info), transparent);
}

.event-item {
  position: relative;
  padding-bottom: 1rem;
}

.event-item::before {
  content: '';
  position: absolute;
  left: -2.25rem;
  top: 0.25rem;
  width: 12px;
  height: 12px;
  background: var(--info);
  border-radius: 50%;
  border: 3px solid var(--primary-bg);
}

.event-time {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
}

.event-description {
  color: var(--text-primary);
  font-size: 0.95rem;
}

.no-recommendations {
  text-align: center;
  padding: 2rem;
  color: var(--text-secondary);
}

.no-recommendations-success {
  color: var(--success);
  font-size: 1.1rem;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .container {
    padding: 1rem;
  }

  header {
    flex-direction: column;
    gap: 1rem;
    align-items: start;
  }

  .header-left {
    flex-direction: column;
    gap: 1rem;
    width: 100%;
  }

  nav {
    width: 100%;
    display: flex;
    gap: 0;
    flex-wrap: wrap;
  }

  nav button {
    flex: 1;
  }

  .kpi-bar {
    grid-template-columns: repeat(2, 1fr);
  }

  .sites-grid {
    grid-template-columns: 1fr;
  }

  .controls {
    flex-direction: column;
  }

  .search-box {
    min-width: 100%;
  }

  .site-detail-header {
    flex-direction: column;
    gap: 1rem;
  }

  .asset-cards {
    grid-template-columns: 1fr;
  }

  .detail-health-display {
    flex-direction: column;
    align-items: start;
  }
}

/* ===== EMPTY STATE ===== */
.empty-state {
  text-align: center;
  padding: 3rem;
  color: var(--text-secondary);
}

.empty-state-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}