/* ============================================================
   SYNTH LAB — Waveform Synthesizer v1.0
   Dark Synthwave Theme
   ============================================================ */

:root {
  --bg-deep:    #06060C;
  --bg-panel:   #0C0C18;
  --bg-surface: #12122A;
  --border:     #1A1A38;
  --border-lit: #2A2A50;

  --text:       #C8D0E0;
  --text-dim:   #6A7088;
  --text-muted: #3A4058;

  --cyan:       #00E5FF;
  --cyan-dim:   #0088AA;
  --magenta:    #FF4081;
  --magenta-dim:#990044;
  --gold:       #FFC107;
  --green:      #4ADE80;
  --red:        #EF4444;

  --font-mono:  'Share Tech Mono', 'Consolas', monospace;
  --font-display:'Orbitron', sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 15px; height: 100%; }
body {
  font-family: var(--font-mono);
  background: var(--bg-deep);
  color: var(--text);
  height: 100vh;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  user-select: none;
}

/* ============================================================
   APP LAYOUT
   ============================================================ */
.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  max-height: 100vh;
}

/* ============================================================
   HEADER
   ============================================================ */
.header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 10px 24px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  z-index: 10;
}
.title {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: 3px;
  color: var(--cyan);
  text-shadow: 0 0 20px rgba(0,229,255,0.5);
}
.title .accent {
  color: var(--magenta);
  text-shadow: 0 0 20px rgba(255,64,129,0.5);
  animation: blink 1.2s step-end infinite;
}
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:0.2} }
.subtitle {
  font-size: 0.62rem;
  color: var(--text-dim);
  letter-spacing: 2px;
  margin-right: auto;
}

.mode-tabs {
  display: flex;
  gap: 2px;
  border: 1px solid var(--border-lit);
  border-radius: 4px;
  overflow: hidden;
}
.mode-tab {
  padding: 8px 18px;
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 1px;
  cursor: pointer;
  transition: all 0.25s;
}
.mode-tab:hover { color: var(--text); background: rgba(255,255,255,0.03); }
.mode-tab.active {
  background: rgba(0,229,255,0.1);
  color: var(--cyan);
  text-shadow: 0 0 8px rgba(0,229,255,0.4);
}

/* ============================================================
   MAIN AREA — Ring + Scope
   ============================================================ */
.main-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 0;
  position: relative;
  background: radial-gradient(ellipse at center, rgba(0,229,255,0.03) 0%, transparent 70%);
}

/* ---- Ring Container ---- */
.ring-container {
  position: relative;
  width: min(380px, 55vh);
  height: min(380px, 55vh);
  flex-shrink: 0;
}
.ring-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.ring-center {
  position: absolute;
  inset: 30%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
}
.freq-display {
  font-family: var(--font-display);
  font-size: 0.85rem;
  color: var(--cyan);
  letter-spacing: 1px;
  text-shadow: 0 0 10px rgba(0,229,255,0.6);
  transition: color 0.3s;
}
.vol-display {
  font-size: 0.62rem;
  color: var(--text-dim);
  letter-spacing: 1px;
}
.peak-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--magenta);
  box-shadow: 0 0 12px var(--magenta);
  margin-top: 6px;
  transition: transform 0.1s, opacity 0.15s;
  opacity: 0;
}
.peak-dot.visible { opacity: 1; transform: scale(1.5); }

.ring-glow {
  position: absolute;
  inset: -20%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0,229,255,0.08) 0%, transparent 70%);
  pointer-events: none;
  transition: opacity 0.3s;
  opacity: 0.3;
}

/* ---- Scope Container ---- */
.scope-container {
  width: 90%;
  max-width: 800px;
  height: 100px;
  position: relative;
  border: 1px solid var(--border-lit);
  border-radius: 6px;
  background: rgba(0,0,0,0.4);
  margin-top: 12px;
  flex-shrink: 0;
  overflow: hidden;
}
.scope-canvas {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
}
.scope-grid {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}
.grid-line {
  position: absolute;
  left: 0; right: 0;
  height: 1px;
  background: rgba(0,229,255,0.08);
}

/* ============================================================
   CONTROLS
   ============================================================ */
.controls {
  background: var(--bg-panel);
  border-top: 1px solid var(--border);
  padding: 14px 20px 10px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  overflow-y: auto;
  max-height: 42vh;
}
.controls::-webkit-scrollbar { width: 4px; }
.controls::-webkit-scrollbar-thumb { background: var(--border-lit); }
.controls::-webkit-scrollbar-track { background: transparent; }

.control-panel { display: none; }
.control-panel.active { display: block; }

/* ---- Function Input ---- */
.input-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}
.input-label {
  font-family: var(--font-display);
  font-size: 0.75rem;
  color: var(--cyan);
  letter-spacing: 1px;
}
.function-input {
  flex: 1;
  background: var(--bg-surface);
  border: 1px solid var(--border-lit);
  border-radius: 4px;
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  padding: 8px 14px;
  outline: none;
  transition: border-color 0.2s;
  letter-spacing: 0.5px;
}
.function-input:focus { border-color: var(--cyan); box-shadow: 0 0 10px rgba(0,229,255,0.15); }
.function-input.error { border-color: var(--red); color: var(--red); }

.btn-apply {
  padding: 8px 20px;
  background: rgba(0,229,255,0.1);
  border: 1px solid var(--cyan);
  border-radius: 4px;
  color: var(--cyan);
  font-family: var(--font-display);
  font-size: 0.65rem;
  letter-spacing: 2px;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-apply:hover {
  background: var(--cyan);
  color: var(--bg-deep);
  box-shadow: 0 0 20px rgba(0,229,255,0.4);
}

.btn-icon {
  width: 32px; height: 32px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--border-lit);
  border-radius: 4px;
  color: var(--text-dim);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.15s;
  display: flex; align-items: center; justify-content: center;
}
.btn-icon:hover { border-color: var(--gold); color: var(--gold); background: rgba(255,193,7,0.06); }
.btn-icon.bookmarked { border-color: var(--gold); color: var(--gold); background: rgba(255,193,7,0.12); text-shadow: 0 0 6px rgba(255,193,7,0.5); }
.btn-icon:disabled { opacity: 0.3; cursor: default; border-color: var(--border); color: var(--text-muted); }
.btn-icon:disabled:hover { background: transparent; }

.math-keyboard {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: 8px;
}
.math-key {
  padding: 5px 10px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  cursor: pointer;
  transition: all 0.15s;
}
.math-key:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(0,229,255,0.08);
}

.preset-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}
.preset-label {
  font-size: 0.58rem;
  color: var(--text-muted);
  letter-spacing: 2px;
  margin-right: 4px;
}
.preset-btn {
  padding: 4px 10px;
  background: transparent;
  border: 1px solid var(--border-lit);
  border-radius: 3px;
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.6rem;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}
.preset-btn:hover {
  border-color: var(--magenta);
  color: var(--magenta);
  background: rgba(255,64,129,0.06);
}

/* ---- Favorites Panel ---- */
.fav-section {
  border-top: 1px solid var(--border);
  padding-top: 6px;
  margin-top: 4px;
}
.fav-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
}
.fav-label {
  font-size: 0.58rem;
  color: var(--text-muted);
  letter-spacing: 2px;
}
.fav-count {
  font-family: var(--font-mono);
  font-size: 0.55rem;
  color: var(--gold);
  background: rgba(255,193,7,0.1);
  padding: 1px 6px;
  border-radius: 8px;
}
.fav-list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  max-height: 80px;
  overflow-y: auto;
}
.fav-list::-webkit-scrollbar { width: 3px; }
.fav-list::-webkit-scrollbar-thumb { background: var(--border-lit); }
.fav-empty {
  font-size: 0.58rem;
  color: var(--text-muted);
  font-style: italic;
  padding: 4px 0;
}
.fav-item {
  display: flex;
  align-items: center;
  gap: 0;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
  transition: all 0.15s;
  white-space: nowrap;
}
.fav-item:hover { border-color: var(--gold); }
.fav-item-name {
  padding: 4px 8px;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--text);
  cursor: pointer;
  background: transparent;
  border: none;
  max-width: 140px;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color 0.15s;
}
.fav-item-name:hover { color: var(--cyan); }
.fav-item-del {
  padding: 4px 6px;
  font-size: 0.55rem;
  color: var(--text-muted);
  cursor: pointer;
  background: transparent;
  border: none;
  border-left: 1px solid var(--border);
  transition: all 0.15s;
}
.fav-item-del:hover { color: var(--red); background: rgba(239,68,68,0.1); }

/* ---- Wave Combination ---- */
.wave-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-bottom: 8px;
}

.wave-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.wave-card-header {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 2px;
}
.wave-dot {
  width: 8px; height: 8px; border-radius: 50%;
}
.wave-dot-sine { background: var(--cyan);   box-shadow: 0 0 6px var(--cyan); }
.wave-dot-tri  { background: var(--green);  box-shadow: 0 0 6px var(--green); }
.wave-dot-saw  { background: var(--gold);   box-shadow: 0 0 6px var(--gold); }
.wave-dot-sqr  { background: var(--magenta);box-shadow: 0 0 6px var(--magenta); }
.wave-name {
  font-family: var(--font-display);
  font-size: 0.6rem;
  letter-spacing: 1px;
  color: var(--text-dim);
}
.wave-icon {
  margin-left: auto;
  font-size: 0.7rem;
  color: var(--text-muted);
}

.slider-group {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.slider-group label {
  font-size: 0.55rem;
  color: var(--text-dim);
  letter-spacing: 0.5px;
  display: flex;
  justify-content: space-between;
}
.slider-val { color: var(--text); font-family: var(--font-mono); }

.slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  border-radius: 2px;
  background: var(--border-lit);
  outline: none;
  cursor: pointer;
}
.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px; height: 12px;
  border-radius: 50%;
  cursor: pointer;
  transition: box-shadow 0.15s;
}
.slider-sine::-webkit-slider-thumb { background: var(--cyan); box-shadow: 0 0 10px rgba(0,229,255,0.5); }
.slider-tri::-webkit-slider-thumb  { background: var(--green); box-shadow: 0 0 10px rgba(74,222,128,0.5); }
.slider-saw::-webkit-slider-thumb  { background: var(--gold); box-shadow: 0 0 10px rgba(255,193,7,0.5); }
.slider-sqr::-webkit-slider-thumb  { background: var(--magenta); box-shadow: 0 0 10px rgba(255,64,129,0.5); }
.slider-vol::-webkit-slider-thumb  { background: var(--cyan); box-shadow: 0 0 10px rgba(0,229,255,0.5); }
.slider::-webkit-slider-thumb:hover { transform: scale(1.3); }

.slider::-moz-range-thumb {
  width: 12px; height: 12px; border-radius: 50%; border: none; cursor: pointer;
}

/* Number input alongside sliders */
.slider-row {
  display: flex;
  align-items: center;
  gap: 6px;
}
.slider-row .slider {
  flex: 1;
}
.num-input {
  width: 60px;
  padding: 3px 5px;
  background: var(--bg-surface);
  border: 1px solid var(--border-lit);
  border-radius: 3px;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  text-align: right;
  outline: none;
  transition: border-color 0.2s;
  -moz-appearance: textfield;
}
.num-input::-webkit-inner-spin-button,
.num-input::-webkit-outer-spin-button {
  opacity: 0.5;
  height: 18px;
}
.num-input:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 6px rgba(0,229,255,0.15);
}

/* ---- K multipliers ---- */
.k-row {
  border-top: 1px solid var(--border);
  padding-top: 8px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.k-label {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: var(--text-dim);
  letter-spacing: 0.5px;
  text-align: center;
}
.k-sliders {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}
.k-group {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.k-group label {
  font-size: 0.55rem;
  color: var(--text-dim);
  display: flex;
  justify-content: space-between;
}

/* ---- Master Bar ---- */
.master-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding-top: 6px;
  border-top: 1px solid var(--border);
}

.play-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 22px;
  background: rgba(0,229,255,0.1);
  border: 1.5px solid var(--cyan);
  border-radius: 6px;
  color: var(--cyan);
  font-family: var(--font-display);
  font-size: 0.7rem;
  letter-spacing: 2px;
  cursor: pointer;
  transition: all 0.2s;
}
.play-btn:hover {
  background: var(--cyan);
  color: var(--bg-deep);
  box-shadow: 0 0 24px rgba(0,229,255,0.5);
}
.play-btn.playing {
  background: var(--magenta);
  border-color: var(--magenta);
  color: var(--bg-deep);
  box-shadow: 0 0 24px rgba(255,64,129,0.5);
}
.play-btn.playing .play-icon { content: '■'; }
.play-icon { font-size: 0.8rem; }

.master-slider {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  max-width: 220px;
}
.master-slider label {
  font-size: 0.6rem;
  color: var(--text-muted);
  letter-spacing: 1px;
}
.vol-pct {
  font-size: 0.6rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
  min-width: 36px;
}

.clip-indicator {
  padding: 4px 10px;
  border: 1px solid var(--red);
  border-radius: 3px;
  color: var(--red);
  font-family: var(--font-display);
  font-size: 0.55rem;
  letter-spacing: 2px;
  opacity: 0;
  transition: opacity 0.1s;
}
.clip-indicator.on {
  opacity: 1;
  background: rgba(239,68,68,0.15);
  animation: clipFlash 0.5s ease;
}
@keyframes clipFlash {
  0%,100%{box-shadow: 0 0 0 rgba(239,68,68,0)}
  50%{box-shadow: 0 0 16px rgba(239,68,68,0.6)}
}

.mode-indicator {
  margin-left: auto;
  font-size: 0.58rem;
  color: var(--text-muted);
  letter-spacing: 1px;
  font-family: var(--font-display);
}

/* ============================================================
   TOAST
   ============================================================ */
.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  padding: 10px 24px;
  background: var(--bg-surface);
  border: 1px solid var(--red);
  border-radius: 6px;
  color: var(--red);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s;
  z-index: 1000;
  letter-spacing: 0.5px;
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 860px) {
  .wave-grid { grid-template-columns: repeat(2, 1fr); }
  .k-sliders { grid-template-columns: repeat(2, 1fr); }
  .ring-container { width: min(280px, 40vh); height: min(280px, 40vh); }
  .header { flex-wrap: wrap; }
  .mode-tabs { margin-top: 4px; }
  .math-keyboard { gap: 2px; }
  .math-key { padding: 4px 7px; font-size: 0.6rem; }
}
@media (max-width: 480px) {
  .wave-grid { grid-template-columns: 1fr; }
  .k-sliders { grid-template-columns: 1fr 1fr; }
  .input-row { flex-wrap: wrap; }
  .btn-apply { width: 100%; }
}

/* Selection */
::selection { background: rgba(0,229,255,0.3); color: white; }