/* --- VU22DX SDR Theme Variables --- */
:root {
  --bg-dark: #0b0c10;
  --panel-bg: #15181e;
  --panel-border: #232833;
  --text-main: #e2e8f0;
  --text-muted: #8b949e;
  --accent-cyan: #00ffcc;
  --accent-blue: #3b82f6;
  --danger-red: #ef4444;
  --meter-safe: #10b981;
  --meter-warn: #eab308;
  --meter-peak: #ef4444;
  --font-mono: 'Courier New', Courier, monospace;
  --font-sans: system-ui, -apple-system, sans-serif;
}

/* --- Global Reset & Base --- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
}

/* --- Layout Grid --- */
.sdr-dashboard {
  width: 100%;
  max-width: 1200px;
  background-color: #000;
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.8);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 2fr;
  gap: 2px;
  background-color: var(--panel-border);
}

.panel {
  background-color: var(--panel-bg);
  padding: 24px;
}

.panel h2 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--text-muted);
  margin-bottom: 20px;
  border-bottom: 1px solid var(--panel-border);
  padding-bottom: 8px;
}

/* --- Header --- */
.topbar {
  background-color: var(--panel-bg);
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--panel-border);
}

.brand h1 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 1px;
}

.brand span {
  color: var(--accent-cyan);
  font-weight: 300;
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--accent-cyan);
  background: rgba(0, 255, 204, 0.1);
  padding: 6px 16px;
  border-radius: 20px;
  border: 1px solid rgba(0, 255, 204, 0.3);
  text-transform: uppercase;
}

.pulse {
  width: 8px;
  height: 8px;
  background-color: var(--accent-cyan);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-cyan);
  animation: pulse-glow 1.5s infinite alternate;
}

@keyframes pulse-glow {
  from { opacity: 0.5; box-shadow: 0 0 4px var(--accent-cyan); }
  to { opacity: 1; box-shadow: 0 0 12px var(--accent-cyan); }
}

/* --- Controls & Inputs --- */
.control-group {
  margin-bottom: 16px;
}

.control-group label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.modern-select {
  width: 100%;
  background-color: var(--bg-dark);
  color: var(--text-main);
  border: 1px solid var(--panel-border);
  padding: 10px;
  border-radius: 6px;
  font-size: 0.95rem;
  outline: none;
  appearance: none;
  cursor: pointer;
}

.modern-select:focus {
  border-color: var(--accent-blue);
}

/* --- Buttons --- */
.action-buttons {
  display: flex;
  gap: 10px;
  margin-top: 24px;
}

.btn {
  flex: 1;
  padding: 12px;
  border: none;
  border-radius: 6px;
  font-weight: bold;
  letter-spacing: 1px;
  cursor: pointer;
  transition: all 0.2s;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background-color: var(--accent-blue);
  color: #fff;
}
.btn-primary:hover:not(:disabled) {
  background-color: #2563eb;
  box-shadow: 0 0 15px rgba(59, 130, 246, 0.4);
}

.btn-danger {
  background-color: transparent;
  border: 1px solid var(--danger-red);
  color: var(--danger-red);
}
.btn-danger:hover:not(:disabled) {
  background-color: rgba(239, 68, 68, 0.1);
}

/* --- Toggle Switch --- */
.toggle-group {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 30px;
}

.toggle-label {
  font-weight: 500;
}

.switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0; left: 0; right: 0; bottom: 0;
  background-color: var(--bg-dark);
  border: 1px solid var(--panel-border);
  transition: .4s;
  border-radius: 24px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 16px;
  width: 16px;
  left: 3px;
  bottom: 3px;
  background-color: var(--text-muted);
  transition: .4s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: rgba(0, 255, 204, 0.2);
  border-color: var(--accent-cyan);
}

input:checked + .slider:before {
  transform: translateX(20px);
  background-color: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan);
}

/* --- Range Sliders --- */
.slider-group {
  margin-bottom: 24px;
}

.slider-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 10px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

input[type=range] {
  -webkit-appearance: none;
  width: 100%;
  background: transparent;
}

input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  height: 18px;
  width: 18px;
  border-radius: 50%;
  background: var(--accent-cyan);
  cursor: pointer;
  margin-top: -7px;
  box-shadow: 0 0 10px rgba(0, 255, 204, 0.4);
}

input[type=range]::-webkit-slider-runnable-track {
  width: 100%;
  height: 4px;
  cursor: pointer;
  background: var(--bg-dark);
  border-radius: 2px;
}

/* --- Meters --- */
.meters-container {
  display: flex;
  gap: 20px;
  margin-bottom: 24px;
}

.meter-box {
  flex: 1;
}

.meter-header {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.db-readout {
  color: var(--text-main);
}

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

.meter-bar-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--meter-safe) 0%, var(--meter-warn) 80%, var(--meter-peak) 100%);
  transition: width 0.1s ease-out;
}

/* --- Waterfall Scopes --- */
.scopes-container {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.scope-wrapper {
  background-color: var(--bg-dark);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  overflow: hidden;
}

.scope-header {
  display: flex;
  justify-content: space-between;
  padding: 6px 12px;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  background-color: rgba(255,255,255,0.03);
  border-bottom: 1px solid var(--panel-border);
}

.scope-header.accent {
  color: var(--accent-cyan);
}

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

/* --- Footer --- */
.copyright {
  text-align: center;
  padding: 16px;
  font-size: 0.8rem;
  color: var(--text-muted);
  background-color: var(--panel-bg);
  border-top: 1px solid var(--panel-border);
}

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