/* NISPS Playground - Dark theme, mobile-first */

:root {
  --bg: #0d0d0d;
  --bg-surface: #1a1a1a;
  --bg-elevated: #252525;
  --text: #ccc;
  --text-dim: #666;
  --accent: #00ff88;
  --accent-dim: #00cc6a;
  --danger: #ff3366;
  --good: #00ff88;
  --bad: #ff6644;
  --synth-accent: #ff6b35;
}

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

html, body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro', 'Segoe UI', system-ui, sans-serif;
  font-size: 14px;
  height: 100%;
  overflow: hidden;
  touch-action: manipulation;
  -webkit-user-select: none;
  user-select: none;
}

/* --- Layout --- */
.app {
  display: grid;
  grid-template-rows: auto 1fr auto auto auto;
  height: 100vh;
  height: 100dvh;
  max-width: 600px;
  margin: 0 auto;
  position: relative;
}

.header,
.visual-container,
.param-container,
.controls-area,
.presets,
.expand-visual-btn {
  transition: all 0.2s ease;
}

/* Header */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  border-bottom: 1px solid #222;
}

.header h1 {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.5px;
  color: var(--accent);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.header button {
  background: none;
  border: 1px solid #333;
  color: var(--text-dim);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 14px;
}

.mode-badge {
  font-size: 10px;
  padding: 3px 8px;
  border-radius: 10px;
  background: rgba(0, 255, 136, 0.12);
  border: 1px solid var(--accent-dim);
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 600;
}

.mode-badge.synth {
  background: rgba(255, 107, 53, 0.12);
  border-color: var(--synth-accent);
  color: var(--synth-accent);
}

/* ==================== Side Panel ==================== */
.side-panel-toggle {
  position: fixed;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  z-index: 50;
  background: var(--bg-surface);
  border: 1px solid #333;
  border-left: none;
  border-radius: 0 8px 8px 0;
  color: var(--text-dim);
  font-size: 16px;
  padding: 12px 6px;
  cursor: pointer;
  line-height: 1;
  transition: background 0.15s;
}

.side-panel-toggle:hover {
  background: var(--bg-elevated);
  color: var(--text);
}

.side-panel {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: 260px;
  background: var(--bg-surface);
  border-right: 1px solid #333;
  z-index: 60;
  transform: translateX(-100%);
  transition: transform 0.25s ease;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.side-panel.open {
  transform: translateX(0);
}

.side-panel-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 55;
}

.side-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px 10px;
  border-bottom: 1px solid #222;
}

.side-panel-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  letter-spacing: 0.5px;
}

.side-panel-close {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 22px;
  cursor: pointer;
  line-height: 1;
  padding: 0 4px;
}

.side-panel-tabs {
  display: flex;
  gap: 0;
  padding: 12px 16px;
  border-bottom: 1px solid #222;
}

.sp-tab {
  flex: 1;
  padding: 8px 0;
  background: var(--bg-elevated);
  border: 1px solid #333;
  color: var(--text-dim);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.sp-tab:first-child {
  border-radius: 6px 0 0 6px;
}

.sp-tab:last-child {
  border-radius: 0 6px 6px 0;
  border-left: none;
}

.sp-tab.active[data-mode="visual"] {
  background: rgba(0, 255, 136, 0.12);
  border-color: var(--accent-dim);
  color: var(--accent);
}

.sp-tab.active[data-mode="synth"] {
  background: rgba(255, 107, 53, 0.12);
  border-color: var(--synth-accent);
  color: var(--synth-accent);
}

.sp-hint {
  padding: 16px;
  font-size: 12px;
  color: var(--text-dim);
  line-height: 1.5;
}

/* Synth controls */
.synth-controls {
  padding: 12px 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.synth-section {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.synth-label {
  font-size: 11px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 600;
}

.synth-label span {
  color: var(--synth-accent);
  font-weight: 700;
}

.synth-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: #333;
  border-radius: 3px;
  outline: none;
}

.synth-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  background: var(--synth-accent);
  border-radius: 50%;
  cursor: pointer;
}

.synth-slider::-moz-range-thumb {
  width: 16px;
  height: 16px;
  background: var(--synth-accent);
  border-radius: 50%;
  cursor: pointer;
  border: none;
}

.synth-select {
  background: var(--bg-elevated);
  border: 1px solid #333;
  color: var(--text);
  padding: 6px 8px;
  border-radius: 6px;
  font-size: 12px;
  cursor: pointer;
}

.synth-start-btn {
  font-size: 12px;
}

.synth-arp-btn {
  font-size: 12px;
}

.synth-arp-btn.playing {
  background: rgba(255, 107, 53, 0.15);
  border-color: var(--synth-accent);
  color: var(--synth-accent);
}

.synth-status {
  font-size: 10px;
  color: var(--text-dim);
  font-family: monospace;
}

/* Visual canvas */
.visual-container {
  position: relative;
  min-height: 0;
}

.expand-visual-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  z-index: 2;
  background: rgba(26, 26, 26, 0.82);
  border: 1px solid #333;
  color: #9f9f9f;
  border-radius: 12px;
  font-size: 11px;
  line-height: 1;
  padding: 6px 10px;
  cursor: pointer;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.expand-visual-btn:active,
.expand-visual-btn[aria-pressed="true"] {
  border-color: var(--accent-dim);
  color: var(--accent);
  background: rgba(0, 255, 136, 0.15);
}

.visual-container canvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* Preset pills */
.presets {
  position: absolute;
  top: 8px;
  left: 8px;
  display: flex;
  gap: 6px;
  z-index: 2;
}

.preset-pill {
  background: rgba(26, 26, 26, 0.8);
  border: 1px solid #333;
  color: var(--text-dim);
  padding: 4px 10px;
  border-radius: 12px;
  font-size: 11px;
  cursor: pointer;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.preset-pill:active {
  background: rgba(0, 255, 136, 0.15);
  border-color: var(--accent-dim);
  color: var(--accent);
}

/* Parameter display */
.param-container {
  padding: 6px 12px;
  background: var(--bg-surface);
  border-top: 1px solid #222;
}

.param-row {
  display: flex;
  align-items: center;
  gap: 8px;
  height: 22px;
}

.param-label {
  width: 42px;
  font-size: 10px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  flex-shrink: 0;
}

.param-container.synth-mode .param-label {
  width: 72px;
  color: #886644;
}

.param-track {
  flex: 1;
  height: 8px;
  background: #222;
  border-radius: 4px;
  overflow: hidden;
  position: relative;
}

.draggable .param-track {
  cursor: ew-resize;
  height: 14px;
  border: 1px solid #333;
}

.draggable .param-track:active {
  border-color: var(--accent-dim);
}

.param-fill {
  height: 100%;
  border-radius: 4px;
  transition: width 0.05s ease-out;
}

.param-value {
  width: 32px;
  font-size: 10px;
  color: var(--text-dim);
  text-align: right;
  font-family: monospace;
  flex-shrink: 0;
}

/* Controls area */
.controls-area {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 10px 12px;
  background: var(--bg-surface);
  border-top: 1px solid #222;
}

.app.expanded {
  grid-template-rows: auto minmax(0, 1fr) 58px 102px 0;
}

.app.expanded .header {
  padding-top: 6px;
  padding-bottom: 6px;
}

.app.expanded .header h1 {
  font-size: 13px;
  color: #9a9a9a;
}

.app.expanded .presets {
  top: 6px;
  left: 6px;
  gap: 4px;
}

.app.expanded .preset-pill {
  font-size: 10px;
  padding: 3px 7px;
  color: #868686;
}

.app.expanded .param-container {
  padding: 4px 10px;
  overflow: hidden;
  opacity: 0.78;
}

.app.expanded .param-row {
  height: 17px;
}

.app.expanded .param-track {
  height: 5px;
}

.app.expanded .draggable .param-track {
  height: 9px;
}

.app.expanded .param-label,
.app.expanded .param-value {
  font-size: 9px;
}

.app.expanded .controls-area {
  padding: 6px 10px;
  gap: 8px;
  overflow: hidden;
  opacity: 0.82;
}

.app.expanded #joystick-container {
  width: 94px;
  height: 94px;
  overflow: hidden;
}

.app.expanded #joystick-container canvas {
  transform: scale(0.58);
  transform-origin: top left;
}

.app.expanded .controls-mode-toggle,
.app.expanded .controls-actions {
  margin-bottom: 4px;
}

.app.expanded .btn,
.app.expanded .mode-btn {
  font-size: 10px;
  padding: 5px 10px;
  border-radius: 6px;
}

.app.expanded .btn-good,
.app.expanded .btn-bad {
  font-size: 14px;
  padding: 5px 12px;
}

.app.expanded .controls-status,
.app.expanded .metrics-grid,
.app.expanded .loss-plot-wrap {
  display: none;
}

#joystick-container {
  flex-shrink: 0;
}

#controls-container {
  flex: 1;
  min-width: 0;
}

.controls-mode-toggle {
  display: flex;
  gap: 4px;
  margin-bottom: 8px;
}

.mode-btn {
  flex: 1;
  padding: 6px 0;
  background: var(--bg-elevated);
  border: 1px solid #333;
  color: var(--text-dim);
  font-size: 12px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s;
}

.mode-btn.active {
  background: rgba(0, 255, 136, 0.1);
  border-color: var(--accent-dim);
  color: var(--accent);
}

.controls-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 8px;
}

.btn {
  padding: 8px 14px;
  background: var(--bg-elevated);
  border: 1px solid #333;
  color: var(--text);
  font-size: 12px;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.1s;
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.96);
}

.btn-primary {
  background: rgba(0, 255, 136, 0.12);
  border-color: var(--accent-dim);
  color: var(--accent);
}

.btn-primary:active {
  background: rgba(0, 255, 136, 0.25);
}

.btn-danger {
  color: var(--danger);
  border-color: #552233;
}

.btn-danger:active {
  background: rgba(255, 51, 102, 0.15);
}

.btn-good {
  background: rgba(0, 255, 136, 0.12);
  border-color: var(--accent-dim);
  color: var(--good);
  font-size: 18px;
  padding: 8px 20px;
}

.btn-good:active {
  background: rgba(0, 255, 136, 0.3);
}

.btn-bad {
  background: rgba(255, 102, 68, 0.1);
  border-color: #553322;
  color: var(--bad);
  font-size: 18px;
  padding: 8px 20px;
}

.btn-bad:active {
  background: rgba(255, 102, 68, 0.25);
}

.flash {
  animation: flash-anim 0.2s ease-out;
}

@keyframes flash-anim {
  0% { box-shadow: 0 0 12px var(--accent); }
  100% { box-shadow: none; }
}

.controls-status {
  display: flex;
  gap: 12px;
  font-size: 11px;
  color: var(--text-dim);
  font-family: monospace;
  margin-bottom: 8px;
}

.metrics-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 3px 10px;
  font-size: 10px;
  margin-bottom: 8px;
  font-family: monospace;
}

.metric-label {
  color: #707070;
}

.metric-value {
  color: #b5b5b5;
  text-align: right;
}

.loss-plot-wrap {
  width: 100%;
  border: 1px solid #2a2a2a;
  border-radius: 8px;
  overflow: hidden;
}

#loss-plot {
  width: 100%;
  height: 86px;
  display: block;
}

.hidden { display: none !important; }

/* Help overlay */
.help-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.help-content {
  background: var(--bg-surface);
  border: 1px solid #333;
  border-radius: 12px;
  padding: 20px;
  max-width: 360px;
  max-height: 80vh;
  overflow-y: auto;
  font-size: 13px;
  line-height: 1.5;
}

.help-content h2 {
  color: var(--accent);
  font-size: 16px;
  margin-bottom: 12px;
}

.help-content h3 {
  color: var(--text);
  font-size: 13px;
  margin-top: 14px;
  margin-bottom: 4px;
}

.help-content p, .help-content li {
  color: var(--text-dim);
  margin-bottom: 6px;
}

.help-content ol {
  padding-left: 18px;
}

/* Responsive: wider screens (foldable inner, tablet) */
@media (min-width: 500px) {
  .app {
    max-width: 800px;
  }

  .controls-area {
    padding: 12px 16px;
  }

  .param-container {
    padding: 8px 16px;
  }
}