:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --accent-blue: #38bdf8;
  --accent-cyan: #06b6d4;
  --status-normal: #10b981;
  --status-advisory: #eab308;
  --status-warning: #f97316;
  --status-danger: #ef4444;
  --border-color: #334155;
  --card-bg: rgba(30, 41, 59, 0.85);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* Header */
.app-header {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 10px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.header-title-box {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-badge {
  background: linear-gradient(135deg, #0284c7, #2563eb);
  color: white;
  font-weight: 700;
  font-size: 0.8rem;
  padding: 4px 8px;
  border-radius: 4px;
  letter-spacing: 0.5px;
}

.header-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
}

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

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

.action-btn {
  background-color: var(--bg-tertiary);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 0.82rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
  text-decoration: none;
}

.action-btn:hover {
  background-color: #475569;
  border-color: #64748b;
}

.action-btn.primary {
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  border-color: #3b82f6;
  color: #fff;
  font-weight: 600;
}

.action-btn.primary:hover {
  background: linear-gradient(135deg, #1d4ed8, #1e40af);
}

/* Master Alert Banner */
.alert-banner {
  padding: 8px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
  font-size: 0.9rem;
  transition: background-color 0.3s ease;
}

.alert-normal {
  background-color: rgba(16, 185, 129, 0.2);
  border-bottom: 2px solid var(--status-normal);
  color: #34d399;
}

.alert-advisory {
  background-color: rgba(234, 179, 8, 0.25);
  border-bottom: 2px solid var(--status-advisory);
  color: #fde047;
}

.alert-warning {
  background-color: rgba(249, 115, 22, 0.25);
  border-bottom: 2px solid var(--status-warning);
  color: #fdba74;
}

.alert-danger {
  background-color: rgba(239, 68, 68, 0.3);
  border-bottom: 2px solid var(--status-danger);
  color: #fca5a5;
  animation: pulse-danger 1.5s infinite;
}

@keyframes pulse-danger {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.75; }
}

.alert-text-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.alert-icon {
  font-size: 1.2rem;
}

.alert-detail {
  font-size: 0.8rem;
  font-weight: 400;
  opacity: 0.9;
}

/* Main Layout */
.app-container {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  flex: 1;
  gap: 14px;
  padding: 14px 20px;
  max-width: 1800px;
  margin: 0 auto;
  width: 100%;
}

@media (max-width: 1200px) {
  .app-container {
    grid-template-columns: 1fr;
  }
}

/* Slope Canvas Column */
.canvas-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.card-header {
  padding: 10px 16px;
  background-color: rgba(15, 23, 42, 0.6);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-title {
  font-size: 0.9rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  color: #e2e8f0;
}

.card-badge {
  font-size: 0.7rem;
  background: #334155;
  color: #cbd5e1;
  padding: 2px 6px;
  border-radius: 4px;
}

.canvas-wrapper {
  position: relative;
  width: 100%;
  height: 420px;
  background-color: #0b1120;
}

#slopeCanvas {
  width: 100%;
  height: 100%;
  display: block;
}

.canvas-overlay-hud {
  position: absolute;
  top: 10px;
  left: 10px;
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(4px);
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 4px;
  pointer-events: none;
}

.hud-metric {
  display: flex;
  justify-content: space-between;
  gap: 16px;
}

.hud-label {
  color: var(--text-muted);
}

.hud-val {
  font-family: "Courier New", Courier, monospace;
  font-weight: 700;
}

.canvas-legend {
  padding: 8px 14px;
  background-color: rgba(15, 23, 42, 0.4);
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 0.72rem;
  color: var(--text-muted);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 5px;
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 2px;
}

/* Controls Below Canvas */
.canvas-controls-panel {
  padding: 14px;
  background-color: rgba(15, 23, 42, 0.5);
  border-top: 1px solid var(--border-color);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.control-label-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.control-val-tag {
  color: var(--accent-blue);
  font-family: monospace;
  font-weight: bold;
}

input[type="range"] {
  width: 100%;
  accent-color: #38bdf8;
  height: 6px;
  background: #334155;
  border-radius: 3px;
  cursor: pointer;
}

.sim-actions-row {
  grid-column: 1 / -1;
  display: flex;
  gap: 8px;
  align-items: center;
  justify-content: space-between;
  padding-top: 6px;
  border-top: 1px solid #1e293b;
}

.scenario-select-box {
  display: flex;
  align-items: center;
  gap: 8px;
}

select {
  background-color: var(--bg-tertiary);
  color: #fff;
  border: 1px solid var(--border-color);
  padding: 5px 10px;
  border-radius: 4px;
  font-size: 0.8rem;
  outline: none;
}

/* Tabs & Analytical Charts Column */
.analytics-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.tabs-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  padding: 8px 10px;
  background-color: rgba(15, 23, 42, 0.85);
  border-bottom: 1px solid var(--border-color);
}

.tab-btn {
  padding: 8px 12px;
  background: #1e293b;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 6px;
}

.tab-btn:hover {
  color: var(--text-main);
  background-color: #334155;
  border-color: #475569;
}

.tab-btn.active {
  color: var(--accent-blue);
  background-color: rgba(56, 189, 248, 0.14);
  border-color: var(--accent-blue);
  box-shadow: 0 0 8px rgba(56, 189, 248, 0.2);
}

/* Tab Description Cards */
.tab-desc-card {
  background: rgba(15, 23, 42, 0.75);
  border: 1px solid var(--border-color);
  border-left: 3px solid var(--accent-blue);
  border-radius: 6px;
  padding: 10px 12px;
  font-size: 0.74rem;
  line-height: 1.5;
  color: #94a3b8;
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 4px;
}

.desc-card-title {
  font-size: 0.78rem;
  font-weight: 700;
  color: #e2e8f0;
  display: flex;
  align-items: center;
  gap: 6px;
}

.tab-desc-card strong {
  color: #38bdf8;
}

/* Language Switcher */
.lang-btn-group {
  display: flex;
  background: #1e293b;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 2px;
}

.lang-btn {
  background: transparent;
  border: none;
  color: #94a3b8;
  padding: 3px 8px;
  border-radius: 3px;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.lang-btn:hover {
  color: #fff;
}

.lang-btn.active {
  background: #0284c7;
  color: #fff;
}

.tab-pane {
  display: none;
  padding: 14px;
  flex-direction: column;
  gap: 14px;
  height: 100%;
  overflow-y: auto;
}

.tab-pane.active {
  display: flex;
}

/* Charts & Gauges */
.chart-box {
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 12px;
  position: relative;
}

.chart-header {
  font-size: 0.8rem;
  font-weight: 600;
  color: #cbd5e1;
  margin-bottom: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.chart-container-inner {
  position: relative;
  width: 100%;
  height: 200px;
}

/* Gauge Cluster */
.gauge-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 10px;
}

.gauge-card {
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 10px;
  text-align: center;
}

.gauge-title {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.gauge-value {
  font-size: 1.15rem;
  font-weight: 700;
  font-family: monospace;
  margin-bottom: 2px;
}

.gauge-state {
  font-size: 0.68rem;
  padding: 2px 6px;
  border-radius: 3px;
  display: inline-block;
  font-weight: 600;
}

/* Telemetry Raw Feed */
.terminal-window {
  background-color: #050811;
  border: 1px solid #1e293b;
  border-radius: 6px;
  padding: 10px;
  font-family: "Courier New", Courier, monospace;
  font-size: 0.72rem;
  color: #38bdf8;
  height: 180px;
  overflow-y: auto;
  line-height: 1.4;
}

.terminal-line {
  margin-bottom: 3px;
}

.terminal-timestamp {
  color: #64748b;
}

.terminal-alert {
  color: #ef4444;
  font-weight: bold;
}

.terminal-warning {
  color: #f97316;
}

.terminal-ok {
  color: #10b981;
}

/* SMS Mobile Mockup */
.sms-mockup {
  background: #020617;
  border: 2px solid #334155;
  border-radius: 12px;
  padding: 12px;
  max-width: 320px;
  margin: 0 auto;
}

.sms-header {
  font-size: 0.72rem;
  color: #94a3b8;
  border-bottom: 1px solid #1e293b;
  padding-bottom: 6px;
  margin-bottom: 8px;
  text-align: center;
}

.sms-bubble {
  background: #1e293b;
  border-radius: 8px;
  padding: 10px;
  font-size: 0.75rem;
  line-height: 1.35;
  border-left: 3px solid var(--status-warning);
}

.sms-sender {
  font-weight: bold;
  color: #38bdf8;
  margin-bottom: 4px;
}

/* Diagnostics & Fault Injection */
.fault-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
}

.fault-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: #e2e8f0;
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 0.75rem;
  text-align: left;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

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

.fault-btn.active {
  border-color: #ef4444;
  background: rgba(239, 68, 68, 0.2);
  color: #fca5a5;
}

.fault-title {
  font-weight: 600;
}

.fault-desc {
  font-size: 0.65rem;
  color: var(--text-muted);
}

/* Footer Info */
.app-footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 8px 20px;
  font-size: 0.72rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
  align-items: center;
}