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

:root {
  --bg: #050508;
  --bg-panel: #0a0a10;
  --bg-input: #0d0d14;
  --border: #1a1a2e;
  --text: #c0c0d0;
  --text-dim: #606080;
  --accent: #00ff41;
  --accent-dim: #00aa2a;
  --accent2: #00e5ff;
  --error: #ff3355;
  --glow: 0 0 10px rgba(0, 255, 65, 0.3);
  --glow-strong: 0 0 20px rgba(0, 255, 65, 0.5), 0 0 40px rgba(0, 255, 65, 0.2);
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Fira Code', monospace;
  min-height: 100vh;
  overflow-x: hidden;
}

#app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* HEADER */
#header {
  background: linear-gradient(180deg, #0a0a14 0%, #050508 100%);
  border-bottom: 1px solid var(--border);
  padding: 14px 20px;
  text-align: center;
}

.title {
  font-family: 'Share Tech Mono', monospace;
  font-size: 1.6rem;
  color: var(--accent);
  text-shadow: 0 0 20px rgba(0,255,65,0.4), 0 0 60px rgba(0,255,65,0.15);
  letter-spacing: 3px;
  margin-bottom: 2px;
}

.subtitle {
  font-size: 0.7rem;
  color: var(--text-dim);
  letter-spacing: 1px;
}

/* MAIN LAYOUT */
#main {
  flex: 1;
  display: flex;
  gap: 0;
}

.panel {
  padding: 12px;
}

#editor-panel {
  width: 420px;
  min-width: 320px;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 8px;
  overflow-y: auto;
  max-height: calc(100vh - 100px);
}

#viz-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

.panel-label {
  font-size: 0.65rem;
  color: var(--text-dim);
  letter-spacing: 2px;
  text-transform: uppercase;
}

.error-msg {
  font-size: 0.65rem;
  color: var(--error);
  max-width: 250px;
  text-overflow: ellipsis;
  overflow: hidden;
  white-space: nowrap;
}

/* PRESETS */
#presets-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.preset-btn {
  background: var(--bg-input);
  border: 1px solid var(--border);
  color: var(--accent-dim);
  font-family: 'Fira Code', monospace;
  font-size: 0.6rem;
  padding: 3px 8px;
  border-radius: 3px;
  cursor: pointer;
  transition: all 0.2s;
}

.preset-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: var(--glow);
}

/* FORMULA INPUT */
#formula-input {
  background: var(--bg-input);
  border: 1px solid var(--border);
  color: var(--accent);
  font-family: 'Fira Code', monospace;
  font-size: 0.85rem;
  padding: 10px;
  border-radius: 4px;
  resize: vertical;
  min-height: 70px;
  outline: none;
  transition: border-color 0.2s;
  line-height: 1.5;
}

#formula-input:focus {
  border-color: var(--accent);
  box-shadow: var(--glow);
}

/* OPERATOR BAR */
#operator-bar {
  display: flex;
  gap: 3px;
  flex-wrap: wrap;
}

.op-btn {
  background: var(--bg-input);
  border: 1px solid var(--border);
  color: var(--accent2);
  font-family: 'Fira Code', monospace;
  font-size: 0.75rem;
  width: 32px;
  height: 28px;
  border-radius: 3px;
  cursor: pointer;
  transition: all 0.15s;
}

.op-btn:hover {
  border-color: var(--accent2);
  box-shadow: 0 0 8px rgba(0,229,255,0.3);
}

/* CONTROLS */
#controls-row-1, #controls-row-2 {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: flex-end;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 3px;
  flex: 1;
  min-width: 80px;
}

.control-group label {
  font-size: 0.6rem;
  color: var(--text-dim);
  letter-spacing: 1px;
}

.control-group select,
.control-group input[type="range"] {
  background: var(--bg-input);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: 'Fira Code', monospace;
  font-size: 0.7rem;
  padding: 4px 6px;
  border-radius: 3px;
  outline: none;
}

.control-group select:focus {
  border-color: var(--accent);
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 3px;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 6px rgba(0,255,65,0.5);
  cursor: pointer;
}

.val-display {
  font-size: 0.65rem;
  color: var(--accent);
}

.t-counter {
  flex-direction: row;
  align-items: center;
  gap: 6px;
}

.t-value {
  font-size: 0.8rem;
  color: var(--accent2);
  font-weight: 600;
  min-width: 80px;
}

/* PLAY CONTROLS */
#play-controls {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-top: 4px;
}

.play-button {
  flex: 1;
  background: linear-gradient(135deg, #001a08 0%, #002a10 100%);
  border: 2px solid var(--accent-dim);
  color: var(--accent);
  font-family: 'Share Tech Mono', monospace;
  font-size: 1rem;
  padding: 10px 16px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
  letter-spacing: 3px;
}

.play-button:hover {
  border-color: var(--accent);
  box-shadow: var(--glow-strong);
}

.play-button.playing {
  background: linear-gradient(135deg, #002a10 0%, #003a18 100%);
  border-color: var(--accent);
  box-shadow: var(--glow-strong);
  animation: pulse-glow 1.5s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 10px rgba(0,255,65,0.3), 0 0 20px rgba(0,255,65,0.1); }
  50% { box-shadow: 0 0 20px rgba(0,255,65,0.6), 0 0 40px rgba(0,255,65,0.3), 0 0 60px rgba(0,255,65,0.1); }
}

.action-btn {
  background: var(--bg-input);
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-family: 'Fira Code', monospace;
  font-size: 0.7rem;
  padding: 10px 12px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.action-btn:hover {
  border-color: var(--accent2);
  color: var(--accent2);
}

/* VIZ CONTROLS */
.viz-controls {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

.viz-controls label {
  font-size: 0.6rem;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 4px;
}

.viz-controls input[type="color"] {
  width: 24px;
  height: 18px;
  border: 1px solid var(--border);
  background: none;
  padding: 0;
  cursor: pointer;
  border-radius: 2px;
}

.viz-controls select {
  background: var(--bg-input);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: 'Fira Code', monospace;
  font-size: 0.6rem;
  padding: 2px;
  border-radius: 2px;
}

.viz-controls input[type="range"] {
  width: 60px;
  height: 4px;
}

.toggle-label {
  cursor: pointer;
}

.toggle-label input[type="checkbox"] {
  accent-color: var(--accent);
}

/* SCOPE */
#scope-container {
  flex: 1;
  min-height: 250px;
  position: relative;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  background: #000;
}

#scope-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* CRT EFFECTS */
.crt-effect {
  position: relative;
}

.scanlines {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0,0,0,0.08) 2px,
    rgba(0,0,0,0.08) 4px
  );
  pointer-events: none;
  z-index: 2;
}

.vignette {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: radial-gradient(ellipse at center, transparent 60%, rgba(0,0,0,0.5) 100%);
  pointer-events: none;
  z-index: 3;
}

/* SPECTRUM */
#spectrum-section {
  margin-top: 4px;
}

#spectrum-container {
  height: 100px;
  position: relative;
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
  background: #000;
}

#spectrum-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* FOOTER */
#footer {
  border-top: 1px solid var(--border);
  padding: 10px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.6rem;
  color: var(--text-dim);
}

#footer em {
  color: var(--accent-dim);
}

#footer a {
  color: var(--accent2);
  text-decoration: none;
}

#footer a:hover {
  text-decoration: underline;
}

/* TOAST */
.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent);
  color: #000;
  font-family: 'Fira Code', monospace;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 8px 20px;
  border-radius: 4px;
  z-index: 1000;
  transition: opacity 0.3s;
}

.toast.hidden {
  opacity: 0;
  pointer-events: none;
}

/* RESPONSIVE */
@media (max-width: 800px) {
  #main {
    flex-direction: column-reverse;
  }

  #editor-panel {
    width: 100%;
    border-right: none;
    border-top: 1px solid var(--border);
    max-height: none;
  }

  #scope-container {
    min-height: 200px;
    height: 35vh;
  }

  .title { font-size: 1.2rem; }
  
  .viz-controls {
    gap: 6px;
  }
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg);
}
::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: #2a2a4e;
}