/* =====================================================
   NodeOSC — Base + Dynamic Scaling Styles
   ===================================================== */

/* ---------- Design tokens ---------- */
:root {
  --bg:          #0d0f14;
  --bg-mid:      #13161e;
  --bg-panel:    #181c26;
  --bg-panel2:   #1e2230;
  --border:      #2a2f3f;
  --accent:      #5b8fff;
  --accent2:     #a855f7;
  --accent3:     #22d3a0;
  --text:        #dde1ec;
  --text-dim:    #7a82a0;
  --danger:      #f43f5e;
  --header-h:    2.8rem;
  --sidebar-w:   220px;
  --radius:      8px;
  --gap:         0.75rem;

  /* Dynamic font scale: clamp between 11px and 16px based on viewport */
  font-size: clamp(11px, 1.1vw + 0.3vh, 16px);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; user-select: none; }

html, body {
  width: 100%; height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, sans-serif;
  font-size: 1rem;
  line-height: 1.4;
}

/* Allow selection + copy/paste only inside typeable fields */
input, textarea, [contenteditable="true"] {
  user-select: text;
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 99px; }

/* ---------- Top bar ---------- */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  background: var(--bg-mid);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1rem;
  z-index: 100;
  gap: 0.5rem;
}

.app-title {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent);
  white-space: nowrap;
}

.topbar-controls {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  align-items: center;
}

/* ---------- Main layout ---------- */
.app-layout {
  position: fixed;
  top: var(--header-h);
  bottom: 0; left: 0; right: 0;
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr 285px;
  gap: var(--gap);
  padding: var(--gap);
  overflow: hidden;
}

/* Sidebars */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--gap);
  overflow-y: auto;
  overflow-x: hidden;
  padding-right: 2px;
}

/* Centre column — piano roll fills all available height */
.centre-col {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

/* Oscillator grid */
.osc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(280px, 100%), 1fr));
  gap: var(--gap);
  align-content: start;
}

/* In sidebar, force single-column osc cards */
.sidebar .osc-grid {
  grid-template-columns: 1fr;
}

/* ---------- Buttons ---------- */
.btn-primary, .btn-accent, .btn-danger, .btn-ghost {
  border: none;
  border-radius: var(--radius);
  padding: 0.35em 0.9em;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.1s;
  white-space: nowrap;
}
.btn-primary:hover, .btn-accent:hover, .btn-danger:hover, .btn-ghost:hover { opacity: 0.82; }
.btn-primary:active, .btn-accent:active, .btn-danger:active, .btn-ghost:active { transform: scale(0.96); }

.btn-primary { background: var(--accent);  color: #fff; }
.btn-accent  { background: var(--accent2); color: #fff; }
.btn-danger  { background: var(--danger);  color: #fff; }
.btn-ghost   { background: transparent; border: 1px solid var(--border); color: var(--text-dim); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); opacity: 1; }

/* ---------- Form controls ---------- */
.select-input {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 5px;
  padding: 0.3em 0.5em;
  font-size: 0.82rem;
  cursor: pointer;
  margin-top: 0.2em;
}
.select-input:focus { outline: none; border-color: var(--accent); }

.knob-label {
  display: flex;
  flex-direction: column;
  font-size: 0.75rem;
  color: var(--text-dim);
  gap: 0.2em;
}

.knob-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  border-radius: 2px;
  background: var(--border);
  outline: none;
  cursor: pointer;
  margin-top: 0.25em;
}
.knob-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 13px; height: 13px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 1px var(--accent);
  transition: background 0.15s;
}
.knob-slider:focus::-webkit-slider-thumb { background: var(--accent2); }

.knob-value {
  font-size: 0.72rem;
  color: var(--accent3);
  font-variant-numeric: tabular-nums;
}

/* Editable knob value */
.knob-value-editable {
  cursor: text;
  border-bottom: 1px dashed transparent;
  border-radius: 2px;
  transition: border-color 0.12s;
}
.knob-value-editable:hover {
  border-bottom-color: var(--border);
}
.knob-value-editable.editing {
  background: var(--bg-panel);
  border: 1px solid var(--accent);
  border-radius: 3px;
  padding: 0 0.25em;
  color: var(--text);
  outline: none;
  user-select: text;
  min-width: 2em;
  display: inline-block;
}

.toggle-label {
  display: flex;
  align-items: center;
  gap: 0.4em;
  font-size: 0.78rem;
  color: var(--text-dim);
  cursor: pointer;
  user-select: none;
}
.toggle-label input[type=checkbox] { accent-color: var(--accent2); }

.hint-text {
  font-size: 0.7rem;
  color: var(--text-dim);
  margin-top: 0.4em;
}

/* ---------- BPM row ---------- */
.bpm-row {
  display: flex;
  align-items: center;
  gap: 0.4em;
}
.bpm-slider { flex: 1; }
.bpm-num-input {
  width: 3.8em;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 5px;
  padding: 0.18em 0.3em;
  font-size: 0.82rem;
  font-variant-numeric: tabular-nums;
  text-align: center;
  flex-shrink: 0;
}
.bpm-num-input:focus { outline: none; border-color: var(--accent); }
/* hide spinner arrows */
.bpm-num-input::-webkit-inner-spin-button,
.bpm-num-input::-webkit-outer-spin-button { -webkit-appearance: none; margin: 0; }
.bpm-num-input[type=number] { -moz-appearance: textfield; }

.btn-tap {
  margin-top: 0.25em;
  width: 100%;
  padding: 0.25em 0;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-align: center;
}

/* ---------- Piano ---------- */
.piano-wrap {
  width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
}

.piano {
  display: flex;
  position: relative;
  height: 70px;
  user-select: none;
}

.key-white {
  flex: 1;
  min-width: 20px;
  background: #eee;
  border: 1px solid #aaa;
  border-radius: 0 0 4px 4px;
  cursor: pointer;
  transition: background 0.07s;
  z-index: 1;
}
.key-white:hover   { background: #d8e8ff; }
.key-white.active  { background: var(--accent); }

.key-black {
  position: absolute;
  width: 58%;
  height: 60%;
  background: #1a1a2e;
  border: 1px solid #000;
  border-radius: 0 0 3px 3px;
  cursor: pointer;
  z-index: 2;
  transition: background 0.07s;
}
.key-black:hover  { background: #2a2a4a; }
.key-black.active { background: var(--accent2); }

/* ---------- Visualizer canvas ---------- */
#viz-canvas {
  width: 100%;
  display: block;
  border-radius: 0 0 var(--radius) var(--radius);
  background: var(--bg);
}

.panel-visualizer {
  flex-shrink: 0;
}

/* ---------- Responsive: collapse sidebars on small screens ---------- */
@media (max-width: 860px) {
  :root { --sidebar-w: 0px; }
  .sidebar { display: none; }
  .app-layout { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  .topbar { flex-wrap: wrap; height: auto; padding: 0.4rem; }
  .app-layout { top: 5rem; }
}

/* ---------- Utility ---------- */
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}