:root {
  --bg-color: #0b0f19;
  --card-bg: #111827;
  --card-border: #1f2937;
  --card-hover: #1e293b;
  --primary: #38bdf8;
  --primary-glow: rgba(56, 189, 248, 0.25);
  --primary-gradient: linear-gradient(135deg, #38bdf8 0%, #818cf8 100%);
  --accent: #10b981;
  --accent-glow: rgba(16, 185, 129, 0.2);
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --text-dim: #6b7280;
  --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --radius-lg: 16px;
  --radius-md: 10px;
  --radius-sm: 6px;
}

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

body {
  background-color: var(--bg-color);
  color: var(--text-main);
  font-family: var(--font-sans);
  min-height: 100vh;
  padding: 24px;
  display: flex;
  justify-content: center;
}

.app-container {
  width: 100%;
  max-width: 1200px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* Header */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid var(--card-border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 16px;
}

.logo-icon {
  width: 48px;
  height: 48px;
  background: var(--primary-gradient);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  box-shadow: 0 0 20px var(--primary-glow);
}

.header h1 {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.subtitle {
  font-size: 13px;
  color: var(--text-muted);
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
}

.status-badge.active {
  background: rgba(56, 189, 248, 0.15);
  border-color: rgba(56, 189, 248, 0.4);
  color: var(--primary);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: currentColor;
  box-shadow: 0 0 8px currentColor;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}

/* Grid Layout */
.grid-layout {
  display: grid;
  grid-template-columns: 420px 1fr;
  gap: 24px;
}

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

/* Cards */
.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.card-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Form Groups */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
}

.highlight-val {
  color: var(--primary);
  font-family: var(--font-mono);
}

.input-select, .input-text {
  background: #1e293b;
  border: 1px solid #334155;
  color: var(--text-main);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: var(--font-sans);
  outline: none;
  transition: border-color 0.2s;
}

.input-select:focus, .input-text:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--primary-glow);
}

.input-range {
  accent-color: var(--primary);
  cursor: pointer;
}

.range-labels {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

/* Segmented Control */
.segmented-control {
  display: grid;
  grid-template-columns: 1fr 1fr;
  background: #0f172a;
  padding: 4px;
  border-radius: var(--radius-md);
  gap: 4px;
}

.segment {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
}

.segment.active {
  background: #1e293b;
  color: var(--primary);
  box-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

/* Limit Radio Grid */
.limit-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.radio-card {
  position: relative;
  display: block;
  cursor: pointer;
}

.radio-card input {
  position: absolute;
  opacity: 0;
}

.radio-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 10px 6px;
  background: #1e293b;
  border: 1px solid #334155;
  border-radius: var(--radius-sm);
  transition: all 0.2s;
  height: 100%;
}

.radio-card input:checked + .radio-content {
  border-color: var(--primary);
  background: rgba(56, 189, 248, 0.1);
}

.radio-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-main);
}

.radio-desc {
  font-size: 10px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Action Buttons */
.action-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 8px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 20px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
}

.btn-primary {
  background: var(--primary-gradient);
  color: #0b0f19;
  box-shadow: 0 4px 14px var(--primary-glow);
}

.btn-primary:hover:not(:disabled) {
  opacity: 0.95;
  transform: translateY(-1px);
}

.btn-danger {
  background: #1f2937;
  color: var(--danger);
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.btn-danger:hover:not(:disabled) {
  background: var(--danger);
  color: #fff;
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none;
}

/* Telemetry Section */
.metrics-hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.metric-block {
  background: #0f172a;
  border: 1px solid #1e293b;
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.metric-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.metric-value-wrap {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.metric-value {
  font-family: var(--font-mono);
  font-size: 38px;
  font-weight: 800;
  color: #ffffff;
  letter-spacing: -1px;
}

.main-speed .metric-value {
  color: var(--primary);
  text-shadow: 0 0 20px var(--primary-glow);
}

.metric-unit {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-muted);
}

.metric-sub {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim);
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

@media (max-width: 600px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.stat-item {
  background: #0f172a;
  padding: 12px;
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-label {
  font-size: 11px;
  color: var(--text-dim);
  text-transform: uppercase;
}

.stat-val {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
}

/* Progress Bar */
.progress-container {
  height: 8px;
  background: #1e293b;
  border-radius: 999px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  width: 0%;
  background: var(--primary-gradient);
  transition: width 0.2s ease-out;
}

/* Chart Canvas */
.chart-section {
  background: #0f172a;
  border: 1px solid #1e293b;
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
}

.chart-title {
  font-weight: 600;
  color: var(--text-muted);
}

.chart-peak {
  font-family: var(--font-mono);
  color: var(--primary);
}

.canvas-wrapper {
  width: 100%;
  height: 160px;
}

canvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* CLI Helper */
.cli-helper {
  background: #0b1120;
  border: 1px solid #1e293b;
  border-radius: var(--radius-sm);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.cli-header {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-dim);
  text-transform: uppercase;
}

.cli-code-block {
  background: #030712;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 12px;
  color: #38bdf8;
  overflow-x: auto;
  border-left: 3px solid var(--primary);
}

.hidden {
  display: none !important;
}