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

:root {
  --bg: #0a0c0f;
  --surface: #10141a;
  --panel: #141922;
  --border: #1f2d3d;
  --border-glow: #1e3a5f;
  --green: #00e5a0;
  --green-dim: #00a870;
  --green-glow: rgba(0, 229, 160, 0.15);
  --green-pulse: rgba(0, 229, 160, 0.35);
  --amber: #ffaa44;
  --text-primary: #d4e8d4;
  --text-dim: #4a6a5a;
  --text-muted: #2a4a3a;
  --mono: 'Share Tech Mono', monospace;
  --body: 'Exo 2', sans-serif;
}

html,
body {
  height: 100%;
}

body {
  background: var(--bg);
  font-family: var(--body);

  display: flex;
  justify-content: center;

  min-height: 100vh;
  overflow-x: hidden;

}

.viewport {
  width: 100vw;
  height: 100vh;

  display: flex;
  align-items: center;
  justify-content: center;

  overflow: hidden;
}

/* CRT Scanlines overlay */
.scanlines {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(0deg,
      transparent,
      transparent 2px,
      rgba(0, 0, 0, 0.08) 2px,
      rgba(0, 0, 0, 0.08) 4px);
  z-index: 100;
}

.vignette {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(ellipse at center, transparent 50%, rgba(0, 0, 0, 0.7) 100%);
  z-index: 99;
}

/* Main device container */
.device {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  width: 600px;
  padding: 28px;
  box-shadow:
    0 0 0 1px #0d1117,
    0 0 40px rgba(0, 0, 0, 0.8),
    inset 0 1px 0 rgba(255, 255, 255, 0.04);
  position: relative;
}

.device::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: 9px;
  background: linear-gradient(135deg, rgba(0, 229, 160, 0.06) 0%, transparent 50%, rgba(0, 229, 160, 0.02) 100%);
  pointer-events: none;
}

/* Header */
.device-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.brand-icon {
  color: var(--green);
  font-size: 16px;
  animation: pulse-icon 3s ease-in-out infinite;
}

@keyframes pulse-icon {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.4;
  }
}

.brand-name {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 3px;
  color: var(--text-primary);
}

.brand-model {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 2px;
  color: var(--text-dim);
}

.status-row {
  display: flex;
  align-items: center;
  gap: 7px;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--text-muted);
  transform: translateY(-1px);
  transition: background 0.3s, box-shadow 0.3s;
}

.status-dot.active {
  background: var(--green);
  box-shadow: 0 0 6px var(--green), 0 0 12px var(--green-pulse);
  animation: blink 1.8s ease-in-out infinite;
}

@keyframes blink {

  0%,
  90%,
  100% {
    opacity: 1;
  }

  95% {
    opacity: 0.3;
  }
}

.status-label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 2px;
  color: var(--text-dim);
  transition: color 0.3s;
}

.status-label.active {
  color: var(--green);
}

/* Oscilloscope screen */
.screen {
  background: #060d08;
  border: 1px solid var(--border);
  border-radius: 4px;
  position: relative;
  overflow: hidden;
  margin-bottom: 22px;
  box-shadow: inset 0 0 30px rgba(0, 0, 0, 0.8), 0 0 1px var(--green-dim);
}

.screen::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(rgba(0, 229, 160, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 229, 160, 0.03) 1px, transparent 1px);
  background-size: 56px 24px;
  pointer-events: none;
  z-index: 1;
}

.screen-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, transparent 60%, rgba(0, 0, 0, 0.5) 100%);
  pointer-events: none;
  z-index: 2;
}

#waveCanvas {
  display: block;
  width: 100%;
  height: 120px;
  position: relative;
  z-index: 0;
}

.freq-display {
  position: absolute;
  top: 8px;
  right: 12px;
  font-family: var(--mono);
  z-index: 3;
  line-height: 1;
}

#freqBig {
  font-size: 28px;
  color: var(--green);
  text-shadow: 0 0 10px var(--green), 0 0 20px var(--green-pulse);
  letter-spacing: -1px;
}

.freq-unit {
  font-size: 11px;
  color: var(--green-dim);
  letter-spacing: 2px;
  margin-left: 3px;
}

/* Controls */
.controls {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-bottom: 22px;
}

.control-group {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 14px 16px;
}

.ctrl-label {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 3px;
  color: var(--text-dim);
  display: block;
  margin-bottom: 12px;
}

.slider-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.tick-label {
  font-family: var(--mono);
  font-size: 9px;
  color: var(--text-muted);
  min-width: 22px;
  text-align: center;
}

.slider-track-wrap {
  flex: 1;
}

input[type=range] {
  -webkit-appearance: none;
  width: 100%;
  height: 3px;
  background: var(--border);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
  transition: background 0.2s;
}

input[type=range]:hover {
  background: var(--border-glow);
}

input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--green);
  border: 2px solid var(--bg);
  box-shadow: 0 0 6px var(--green-pulse);
  cursor: pointer;
  transition: box-shadow 0.2s, transform 0.1s;
}

input[type=range]::-webkit-slider-thumb:hover {
  box-shadow: 0 0 10px var(--green), 0 0 20px var(--green-pulse);
  transform: scale(1.15);
}

input[type=range]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--green);
  border: 2px solid var(--bg);
  box-shadow: 0 0 6px var(--green-pulse);
  cursor: pointer;
}

.readout {
  margin-top: 8px;
  display: flex;
  align-items: baseline;
  gap: 5px;
}

.readout-value {
  font-family: var(--mono);
  font-size: 16px;
  color: var(--green);
  text-shadow: 0 0 8px var(--green-glow);
}

.readout-unit {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 2px;
  color: var(--text-dim);
}

/* Waveform selector */
.waveform-group {}

.wave-buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.wave-btn {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--text-dim);
  padding: 8px 4px 6px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 1px;
  transition: all 0.15s;
}

.wave-btn svg {
  width: 38px;
  height: 18px;
  stroke: currentColor;
}

.wave-btn:hover {
  border-color: var(--green-dim);
  color: var(--text-primary);
  background: rgba(0, 229, 160, 0.04);
}

.wave-btn.active {
  border-color: var(--green);
  color: var(--green);
  background: var(--green-glow);
  box-shadow: 0 0 8px rgba(0, 229, 160, 0.1);
}

/* Play button */
.play-section {
  display: flex;
  justify-content: center;
}

#playBtn {
  background: transparent;
  border: 1px solid var(--green-dim);
  color: var(--green);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 4px;
  padding: 14px 48px;
  border-radius: 3px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  transition: all 0.2s;
  position: relative;
  overflow: hidden;
}

#playBtn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--green-glow);
  opacity: 0;
  transition: opacity 0.2s;
}

#playBtn:hover {
  border-color: var(--green);
  box-shadow: 0 0 16px rgba(0, 229, 160, 0.2), inset 0 0 16px rgba(0, 229, 160, 0.05);
}

#playBtn:hover::before {
  opacity: 1;
}

#playBtn.active {
  border-color: var(--amber);
  color: var(--amber);
  box-shadow: 0 0 16px rgba(255, 170, 68, 0.2);
}

#playBtn.active::before {
  background: rgba(255, 170, 68, 0.07);
  opacity: 1;
}

.play-icon {
  font-size: 10px;
  position: relative;
}

#playLabel {
  position: relative;
}

.play-section {
  display: flex;
  justify-content: center;
  gap: 10px;
}

#vizBtn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 4px;
  padding: 14px 20px;
  border-radius: 3px;
  cursor: pointer;
  transition: all 0.2s;
}

#vizBtn:hover {
  border-color: var(--green-dim);
  color: var(--green);
}

#vizBtn.disabled {
  color: var(--text-muted);
  border-color: var(--text-muted);
}

@media (max-width: 640px) {
  .device {
    width: 95vw;
    padding: 18px;
  }

  #freqBig {
    font-size: 22px;
  }
}

/* Footer link */
.device-footer {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: center;
}

.site-link {
  display: flex;
  align-items: center;
  gap: 7px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 2px;
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.2s;
}

.site-link:hover {
  color: var(--green);
}

.site-link-icon {
  font-size: 12px;
  transition: text-shadow 0.2s;
  transform: translateY(-1px);
}

.site-link:hover .site-link-icon {
  text-shadow: 0 0 8px var(--green);
}