:root {
  --base: #0a0a0a;
  --surface: #111111;
  --surface-alt: #1a1a2e;
  --gray-700: #444444;
  --gray-500: #888888;
  --gray-300: #cccccc;
  --contrast: #ffffff;
  --accent: #00ffcc;
  --accent-soft: #00ccaa;
  --accent-alt: #ff2d78;
  --accent-2: #0099ff;
  --font-ui: 'Space Grotesk', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Mono', monospace;
  --panel-width: 300px;
}

* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
  margin: 0;
  padding: 0;
  background: var(--base);
  color: var(--contrast);
  font-family: var(--font-ui);
  overscroll-behavior: none;
}

body {
  overflow: hidden;
}

#stage {
  position: fixed;
  inset: 0;
  cursor: crosshair;
  touch-action: none;
}

body.cursor-hidden,
body.cursor-hidden #stage {
  cursor: none;
}

/* ---------- landing screen ---------- */

#landing {
  position: fixed;
  inset: 0;
  z-index: 500;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  text-align: center;
  padding: 2rem;
  background:
    radial-gradient(circle at 20% 20%, rgba(0, 255, 204, 0.12), transparent 45%),
    radial-gradient(circle at 80% 70%, rgba(255, 45, 120, 0.14), transparent 45%),
    var(--base);
  cursor: pointer;
}

#landing h1 {
  margin: 0;
  font-size: clamp(2.5rem, 9vw, 5rem);
  letter-spacing: 0.02em;
  background: linear-gradient(120deg, var(--accent), var(--accent-2) 45%, var(--accent-alt));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

#landing p {
  margin: 0;
  color: var(--gray-300);
  font-family: var(--font-mono);
  font-size: 0.95rem;
}

#landing .start-hint {
  margin-top: 1rem;
  padding: 0.6rem 1.4rem;
  border: 1px solid var(--accent);
  border-radius: 999px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  animation: pulse 2.2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 1; }
}

/* ---------- control panel ---------- */

.panel-root {
  position: fixed;
  z-index: 400;
  font-family: var(--font-ui);
  transition: opacity 200ms ease;
}

.panel-root.controls-hidden {
  opacity: 0;
  pointer-events: none;
}

.panel-toggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 410;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  height: 44px;
  padding: 0 1.1rem;
  border-radius: 999px;
  border: 1px solid var(--gray-700);
  background: var(--surface);
  color: var(--contrast);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: lowercase;
  letter-spacing: 0.02em;
  cursor: pointer;
}

.panel-toggle-icon {
  font-size: 1.1rem;
  line-height: 1;
}

@keyframes toggle-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(0, 255, 204, 0.35); }
  50% { box-shadow: 0 0 0 8px rgba(0, 255, 204, 0); }
}

.panel-root:not(.open) .panel-toggle {
  border-color: var(--accent);
  color: var(--accent);
  animation: toggle-pulse 2.4s ease-in-out infinite;
}

.panel-sheet {
  position: fixed;
  top: 0;
  right: 0;
  height: 100%;
  width: var(--panel-width);
  background: rgba(10, 10, 10, 0.92);
  backdrop-filter: blur(10px);
  border-left: 1px solid var(--gray-700);
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform 320ms ease;
  padding-top: 4rem;
}

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

.panel-header {
  padding: 0 1rem 0.75rem;
  border-bottom: 1px solid var(--gray-700);
  margin-bottom: 0.75rem;
}

.panel-header-title {
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.78rem;
  color: var(--gray-300);
}

.panel-tabs {
  display: flex;
  gap: 0.4rem;
  padding: 0 1rem 0.75rem;
}

.tab-button {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
  padding: 0.55rem 0.25rem;
  background: var(--surface-alt);
  border: 1px solid var(--gray-700);
  color: var(--gray-300);
  border-radius: 8px;
  text-transform: lowercase;
  font-size: 0.72rem;
  letter-spacing: 0.02em;
  cursor: pointer;
  min-height: 44px;
}

.tab-icon svg {
  width: 18px;
  height: 18px;
  display: block;
}

.tab-button.active {
  background: var(--accent-alt);
  border-color: var(--accent-alt);
  color: var(--base);
}

.tab-hint {
  margin: 0 0 0.25rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.45;
  color: var(--gray-500);
}

.panel-body {
  flex: 1;
  overflow-y: auto;
  padding: 0 1rem 1rem;
  -webkit-overflow-scrolling: touch;
}

.tab-panel.hidden {
  display: none;
}

.tab-panel {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--gray-300);
  text-transform: lowercase;
}

.knob-row, .pad-row, .source-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

select {
  background: var(--surface-alt);
  color: var(--contrast);
  border: 1px solid var(--gray-700);
  border-radius: 6px;
  padding: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  min-height: 44px;
}

.upload-button {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 0.75rem;
  border: 1px dashed var(--gray-500);
  border-radius: 6px;
  color: var(--gray-300);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  cursor: pointer;
  min-height: 44px;
}

.upload-button:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.upload-button input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.action-button {
  min-height: 44px;
  border: 1px solid var(--gray-700);
  background: var(--surface-alt);
  color: var(--gray-300);
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  cursor: pointer;
}

.action-button:hover {
  border-color: var(--accent-alt);
  color: var(--accent-alt);
}

.panel-download {
  margin: 0 1rem 0.75rem;
  min-height: 44px;
  border-color: var(--accent-alt);
  color: var(--accent-alt);
}

.panel-close {
  min-height: 44px;
  border: none;
  border-top: 1px solid var(--gray-700);
  background: var(--surface);
  color: var(--gray-500);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  cursor: pointer;
}

.panel-shortcuts {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 0.75rem 1rem 1rem;
  border-top: 1px solid var(--gray-700);
  background: var(--surface);
}

.panel-shortcut-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--gray-500);
}

.panel-shortcut-key {
  min-width: 2.2em;
  text-align: center;
  padding: 0.1rem 0.4rem;
  border: 1px solid var(--gray-700);
  border-radius: 4px;
  color: var(--gray-300);
  font-family: var(--font-mono);
  text-transform: lowercase;
}

/* toggle switch */

.toggle-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  cursor: pointer;
  min-height: 44px;
}

.toggle-row input {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
}

.toggle-track {
  position: relative;
  width: 42px;
  height: 24px;
  border-radius: 999px;
  background: var(--surface-alt);
  border: 1px solid var(--gray-700);
  flex-shrink: 0;
  transition: background 160ms ease;
}

.toggle-track::before {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--gray-500);
  transition: transform 160ms ease, background 160ms ease;
}

.toggle-row input:checked + .toggle-track {
  background: rgba(0, 255, 204, 0.18);
  border-color: var(--accent);
}

.toggle-row input:checked + .toggle-track::before {
  transform: translateX(18px);
  background: var(--accent);
}

.toggle-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--gray-300);
  text-transform: lowercase;
}

/* knob */

.knob {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
}

.knob-dial {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  position: relative;
  touch-action: none;
  border: 1px solid var(--gray-700);
}

.knob-pointer {
  position: absolute;
  top: 4px;
  left: 50%;
  width: 2px;
  height: 20px;
  background: var(--contrast);
  transform-origin: 50% 22px;
  margin-left: -1px;
  border-radius: 2px;
}

.knob-value {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--accent);
  text-align: center;
  min-height: 1em;
  white-space: nowrap;
}

.knob-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--gray-500);
  text-align: center;
  text-transform: lowercase;
}

/* xy pad */

.xy-pad-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
}

.xy-pad {
  width: 68px;
  height: 68px;
  border-radius: 10px;
  background: var(--surface-alt);
  border: 1px solid var(--gray-700);
  position: relative;
  touch-action: none;
}

.xy-pad-dot {
  position: absolute;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent-alt);
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.xy-pad-value {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: var(--gray-500);
  text-align: center;
  white-space: nowrap;
}

/* brush color field */

.color-field {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  cursor: pointer;
  min-height: 44px;
}

.color-field input[type="color"] {
  -webkit-appearance: none;
  appearance: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--gray-700);
  border-radius: 8px;
  padding: 0;
  background: none;
  cursor: pointer;
  flex-shrink: 0;
}

.color-field input[type="color"]::-webkit-color-swatch-wrapper {
  padding: 2px;
}

.color-field input[type="color"]::-webkit-color-swatch {
  border: none;
  border-radius: 6px;
}

.color-field input[type="color"]::-moz-color-swatch {
  border: none;
  border-radius: 6px;
}

.color-field-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--gray-300);
  text-transform: lowercase;
}

/* ---------- responsive: bottom sheet on narrow screens ---------- */

@media (max-width: 720px) {
  :root {
    --panel-width: 100%;
  }

  .panel-toggle {
    top: auto;
    bottom: calc(1rem + env(safe-area-inset-bottom));
    right: 1rem;
  }

  /* the sheet has its own close button once open; the floating pill would
     otherwise sit on top of the sheet's own bottom controls */
  .panel-root.open .panel-toggle {
    display: none;
  }

  .panel-sheet {
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    height: 100vh;
    height: 100dvh;
    border-left: none;
    border-top: none;
    border-radius: 0;
    transform: translateY(100%);
    padding-top: calc(1rem + env(safe-area-inset-top));
    padding-bottom: env(safe-area-inset-bottom);
  }

  .panel-root.open .panel-sheet {
    transform: translateY(0);
  }

  .panel-tabs {
    padding-top: 0.25rem;
  }
}

@media (orientation: portrait) and (max-width: 720px) {
  #portrait-hint {
    display: block;
  }
}

/* keyboard shortcuts assume a physical keyboard; useless on touch (phone or tablet) */
@media (max-width: 1024px) {
  .panel-shortcuts {
    display: none;
  }
}

#portrait-hint {
  display: none;
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 410;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--gray-500);
  background: rgba(0, 0, 0, 0.5);
  padding: 0.3rem 0.6rem;
  border-radius: 6px;
}