/* ============================================================
   QOIX Synthesizer — Styles
   ============================================================ */

:root {
  --bg:       #0d1210;
  --bg-panel: #141f1b;
  --bg-inset: #090e0c;
  --border:   #2a4038;
  --accent:   #5b67d8;
  --glow:     #7b86f5;
  --accent2:  #e05c5c;
  --green:    #4fc97e;
  --yellow:   #e6c84a;
  --text:     #d6e0dc;
  --dim:      #7a9990;
  --bright:   #eef6f3;
  --radius:   8px;
  --r-sm:     5px;
  --gap:      12px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

#app { display: flex; flex-direction: column; flex: 1; }

/* ── Header ──────────────────────────────────────────────── */
header {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 10px 18px;
  background: #090d0b;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.logo { display: flex; align-items: baseline; gap: 2px; user-select: none; }
.logo .q { font-size: 2.2rem; font-weight: 900; color: var(--glow); text-shadow: 0 0 18px var(--accent); letter-spacing: -1px; }
.logo .rest { font-size: 2.2rem; font-weight: 900; color: var(--bright); letter-spacing: -1px; }
.logo .tag { font-size: 0.72rem; color: var(--dim); text-transform: uppercase; letter-spacing: 2px; margin-left: 10px; }

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

.hdr-label { color: var(--dim); font-size: 0.8rem; }
.small-val { color: var(--dim); font-size: 0.75rem; min-width: 32px; }

/* ── Tabs ────────────────────────────────────────────────── */
.synth-tabs {
  display: flex;
  background: #090d0b;
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
}

.tab-btn {
  padding: 10px 20px;
  background: transparent;
  border: none;
  border-bottom: 3px solid transparent;
  color: var(--dim);
  font-size: 0.82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  cursor: pointer;
  white-space: nowrap;
  transition: color 0.15s, border-color 0.15s;
  border-radius: 0;
}
.tab-btn:hover { color: var(--text); background: transparent; }
.tab-btn.active { color: var(--glow); border-bottom-color: var(--accent); }

.tab-panel { display: none; padding: var(--gap); }
.tab-panel.active { display: block; }

/* ── Panels ──────────────────────────────────────────────── */
.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px;
}

.panel h2 {
  display: flex;
  align-items: center;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--dim);
  border-bottom: 1px solid var(--border);
  padding-bottom: 6px;
  margin-bottom: 8px;
  gap: 6px;
}

.ml-auto { margin-left: auto; }

.section-sub {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--dim);
  margin: 7px 0 4px;
  border-top: 1px solid var(--border);
  padding-top: 5px;
}

/* ── Control rows ────────────────────────────────────────── */
.ctrl-row {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 4px;
}
.ctrl-row .lbl {
  width: 52px;
  font-size: 0.82rem;
  color: var(--dim);
  flex-shrink: 0;
}
.ctrl-row select, .ctrl-row .val { flex-shrink: 0; }
.ctrl-row input[type="range"] { flex: 1; min-width: 0; }
.val {
  font-size: 0.8rem;
  color: var(--text);
  width: 52px;
  text-align: right;
  font-weight: 500;
}

/* ── Range inputs ────────────────────────────────────────── */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  height: 3px;
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--glow);
  border: 2px solid var(--bg);
  box-shadow: 0 0 5px var(--accent);
  cursor: pointer;
}
input[type="range"]::-moz-range-thumb {
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--glow);
  border: 2px solid var(--bg);
}
input[type="range"].vslider {
  writing-mode: vertical-lr;
  direction: rtl;
  height: 64px;
  width: 3px;
  cursor: ns-resize;
}

/* ── Buttons ─────────────────────────────────────────────── */
button {
  background: var(--bg-inset);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 4px 11px;
  border-radius: var(--r-sm);
  cursor: pointer;
  font-size: 0.8rem;
  transition: background 0.12s, border-color 0.12s, color 0.12s;
}
button:hover { background: #1a2820; border-color: var(--accent); color: var(--bright); }
button:active { background: var(--accent); color: #fff; }

.sm-btn { padding: 3px 8px; font-size: 0.72rem; }

#panic-btn { background: #1e0f0f; border-color: #6a1f1f; color: var(--accent2); }
#panic-btn:hover { background: var(--accent2); border-color: var(--accent2); color: #fff; }
#delete-preset-btn { background: #1e0f0f; border-color: #6a1f1f; color: var(--accent2); padding: 3px 7px; }
#delete-preset-btn:hover { background: var(--accent2); color: #fff; }
#export-patch-btn { padding: 3px 8px; }
#import-patch-label { padding: 3px 8px; background: var(--bg-inset); border: 1px solid var(--border); border-radius: var(--r-sm); color: var(--text); font-size: 0.82rem; user-select: none; }
#import-patch-label:hover { border-color: var(--accent); color: var(--glow); }

/* ── Wave / filter buttons ───────────────────────────────── */
.wave-btns { display: flex; gap: 3px; flex-wrap: wrap; }
.wb { padding: 3px 7px; font-size: 0.75rem; min-width: 32px; }
.wb.active { background: var(--accent); border-color: var(--glow); color: #fff; }

/* ── Toggle ──────────────────────────────────────────────── */
.toggle-wrap { display: flex; align-items: center; cursor: pointer; position: relative; }
.toggle-wrap input[type="checkbox"] { opacity: 0; width: 0; height: 0; position: absolute; }
.toggle {
  display: inline-block;
  width: 28px; height: 15px;
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: 8px;
  position: relative;
  transition: background 0.18s;
}
.toggle::after {
  content: '';
  position: absolute;
  top: 2px; left: 2px;
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--dim);
  transition: left 0.18s, background 0.18s;
}
.toggle-wrap input:checked + .toggle { background: var(--accent); border-color: var(--glow); }
.toggle-wrap input:checked + .toggle::after { left: 15px; background: #fff; }

/* ── Select ──────────────────────────────────────────────── */
select {
  background: var(--bg-inset);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 4px 6px;
  border-radius: var(--r-sm);
  font-size: 0.78rem;
  cursor: pointer;
  flex: 1;
}
select:focus { outline: none; border-color: var(--accent); }

/* ══════════════════════════════════════════════════════════
   SUBTRACTIVE TAB LAYOUT
══════════════════════════════════════════════════════════ */
.sub-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr) repeat(2, 1fr);
  grid-template-rows: auto;
  grid-template-areas:
    "osc1 osc2 osc3 env env"
    "filter filter lfo fx fx"
    "viz viz quality fx fx";
  gap: var(--gap);
}

#panel-osc1    { grid-area: osc1; }
#panel-osc2    { grid-area: osc2; }
#panel-osc3    { grid-area: osc3; }
#panel-env     { grid-area: env; }
#panel-filter  { grid-area: filter; }
#panel-lfo     { grid-area: lfo; }
#panel-fx      { grid-area: fx; overflow-y: auto; max-height: 520px; }
#panel-viz     { grid-area: viz; }
#panel-quality { grid-area: quality; }

@media (max-width: 1200px) {
  .sub-grid {
    grid-template-columns: 1fr 1fr 1fr;
    grid-template-areas:
      "osc1 osc2 osc3"
      "env env env"
      "filter filter lfo"
      "fx fx fx"
      "viz viz quality";
  }
}

@media (max-width: 800px) {
  .sub-grid {
    grid-template-columns: 1fr 1fr;
    grid-template-areas:
      "osc1 osc2"
      "osc3 env"
      "filter lfo"
      "fx fx"
      "viz quality";
  }
}

@media (max-width: 600px) {
  .sub-grid { grid-template-columns: 1fr; grid-template-areas: none; }
  .sub-grid > * { grid-area: unset !important; }
}

/* ── Env display ─────────────────────────────────────────── */
.env-sliders {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-bottom: 10px;
}
.env-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 8px 4px;
}
.env-col label { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 1px; color: var(--dim); font-weight: 600; }
.env-col .val { font-size: 0.75rem; text-align: center; width: auto; color: var(--text); font-weight: 500; }

#env-canvas {
  display: block;
  width: 100%;
  height: 70px;
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
}

/* ── FX panel ────────────────────────────────────────────── */
.fx-block { padding: 4px 0; }
.fx-hdr {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 5px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--green);
  text-transform: uppercase;
  letter-spacing: 1px;
}
.fx-sep { border-top: 1px solid var(--border); margin: 8px 0; }

/* ── Visualizer ──────────────────────────────────────────── */
.viz-panel h2 .viz-mode-wrap { display: flex; gap: 4px; }
#viz-canvas {
  display: block;
  width: 100%;
  height: 110px;
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
}
.active-notes { font-size: 0.72rem; color: var(--dim); margin-top: 6px; }
#active-notes-disp { color: var(--glow); font-weight: 600; }

/* ══════════════════════════════════════════════════════════
   FM TAB
══════════════════════════════════════════════════════════ */
.fm-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr 1fr;
  gap: var(--gap);
}
.fm-header-panel { grid-column: 1; }
.fm-op-panel { grid-column: auto; }

@media (max-width: 900px) {
  .fm-grid { grid-template-columns: 1fr 1fr; }
  .fm-header-panel { grid-column: 1 / -1; }
}

.op-title { font-size: 0.68rem; }
.op-carrier { color: var(--glow) !important; }
.op-mod { color: var(--yellow) !important; }

#fm-algo-canvas {
  display: block;
  width: 100%;
  height: 100px;
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  margin-top: 8px;
}
.fm-algo-tip { font-size: 0.65rem; color: var(--dim); margin-top: 4px; }

/* ══════════════════════════════════════════════════════════
   WAVETABLE TAB
══════════════════════════════════════════════════════════ */
.wt-grid {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: var(--gap);
  align-items: start;
}

@media (max-width: 700px) { .wt-grid { grid-template-columns: 1fr; } }

#wt-canvas, #oxford-canvas {
  display: block;
  width: 100%;
  height: 100px;
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  margin-top: 10px;
}
#oxford-canvas { height: 120px; }

.wt-table-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 10px;
}
.wt-table-btn {
  padding: 3px 8px;
  font-size: 0.7rem;
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  cursor: pointer;
  color: var(--text);
  transition: background 0.1s;
}
.wt-table-btn:hover { background: #1a2820; }
.wt-table-btn.active { background: var(--accent); border-color: var(--glow); color: #fff; }

/* Oxford harmonics */
.oxford-info { font-size: 0.72rem; color: var(--dim); margin-bottom: 10px; }
.harmonic-grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 6px;
}
.harmonic-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 6px 4px;
}
.harmonic-col label { font-size: 0.72rem; color: var(--dim); font-weight: 600; }
.harmonic-col .val  { font-size: 0.7rem; text-align: center; width: auto; color: var(--glow); font-weight: 600; }

/* Combined fader: glowing bar + draggable thumb overlay */
.harm-fader {
  position: relative;
  width: 28px;
  height: 100px;
  background: #06060a;
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
  cursor: ns-resize;
}

/* The glowing fill bar — rises from the bottom */
.harm-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 0%;
  background: linear-gradient(to top,
    #1a1a90 0%,
    var(--accent) 55%,
    var(--glow) 88%,
    #c8ccff 100%
  );
  box-shadow: 0 -3px 14px var(--accent), inset 0 0 10px rgba(123,134,245,0.25);
  border-radius: 0 0 3px 3px;
  pointer-events: none;
  transition: height 0.04s ease-out;
}

/* Transparent-track slider sits on top of the bar */
input[type="range"].harm-slider {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  writing-mode: vertical-lr;
  direction: rtl;
  -webkit-appearance: none;
  appearance: none;
  background: transparent !important;
  border: none !important;
  outline: none;
  z-index: 2;
  cursor: ns-resize;
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
input[type="range"].harm-slider::-webkit-slider-runnable-track {
  background: transparent;
  border: none;
}
input[type="range"].harm-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 26px;
  height: 7px;
  border-radius: 3px;
  background: var(--bright);
  border: 1px solid var(--glow);
  box-shadow: 0 0 8px var(--accent), 0 1px 3px rgba(0,0,0,0.8);
  cursor: ns-resize;
}
input[type="range"].harm-slider:hover::-webkit-slider-thumb {
  background: #fff;
  box-shadow: 0 0 14px var(--glow);
}
input[type="range"].harm-slider::-moz-range-track {
  background: transparent;
  border: none;
}
input[type="range"].harm-slider::-moz-range-thumb {
  width: 26px;
  height: 7px;
  border-radius: 3px;
  background: var(--bright);
  border: 1px solid var(--glow);
  box-shadow: 0 0 8px var(--accent);
}

.oxford-presets { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 10px; }

/* ══════════════════════════════════════════════════════════
   MOD MATRIX TAB
══════════════════════════════════════════════════════════ */
.matrix-wrap {
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: var(--gap);
  align-items: start;
}
@media (max-width: 800px) { .matrix-wrap { grid-template-columns: 1fr; } }

.matrix-info { font-size: 0.72rem; color: var(--dim); margin-bottom: 10px; }
.matrix-scroll { overflow-x: auto; padding-bottom: 4px; }

/* ── New mod matrix table ── */
.mod-matrix-table {
  border-collapse: collapse;
  font-size: 0.7rem;
  min-width: 700px;
  width: 100%;
}
.mm-corner {
  background: var(--bg-inset);
  color: var(--dim);
  padding: 6px 10px;
  border: 1px solid var(--border);
  font-size: 0.62rem;
  text-align: left;
  font-style: italic;
}
.mm-dh {
  background: var(--bg-inset);
  color: var(--accent);
  padding: 5px 4px;
  border: 1px solid var(--border);
  text-align: center;
  font-size: 0.65rem;
  white-space: nowrap;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.mm-src {
  background: var(--bg-inset);
  color: var(--glow);
  font-weight: 700;
  font-size: 0.7rem;
  padding: 6px 10px;
  border: 1px solid var(--border);
  white-space: nowrap;
}
.mod-matrix-table td {
  border: 1px solid var(--border);
  padding: 4px 5px;
  text-align: center;
  vertical-align: middle;
  transition: background 0.15s;
}
.mod-matrix-table td.mm-on {
  background: rgba(91,103,216,0.12);
  border-color: rgba(91,103,216,0.4);
}
.mod-matrix-table tr:hover td:not(.mm-src) { background: rgba(91,103,216,0.06); }
.mod-matrix-table tr:hover td.mm-on       { background: rgba(91,103,216,0.18); }

/* Toggle dot button */
.mm-dot {
  display: inline-block;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--bg);
  border: 1.5px solid var(--border);
  cursor: pointer;
  padding: 0;
  margin-bottom: 2px;
  transition: background 0.12s, border-color 0.12s;
  vertical-align: middle;
}
.mm-dot.active {
  background: var(--accent);
  border-color: var(--glow);
  box-shadow: 0 0 5px var(--glow);
}

/* Amount slider in matrix */
.mm-amt {
  width: 58px;
  display: block;
  margin: 2px auto 0;
  accent-color: var(--accent);
}

/* Amount value label */
.mm-val {
  display: block;
  font-size: 0.6rem;
  margin-top: 1px;
  font-variant-numeric: tabular-nums;
}

.src-label {
  font-size: 0.7rem;
  color: var(--glow);
  font-weight: 700;
  white-space: nowrap;
  padding: 5px 10px;
}

.lfo2-panel { align-self: start; }

.mod-src-row {
  margin-top: 10px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
}
.mod-src-val {
  font-size: 0.65rem;
  display: flex;
  justify-content: space-between;
  color: var(--dim);
  padding: 2px 0;
  border-bottom: 1px solid var(--border);
}
.mod-src-val span { color: var(--glow); }

/* ══════════════════════════════════════════════════════════
   RANDOM GENERATOR TAB
══════════════════════════════════════════════════════════ */
.rand-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--gap);
}
@media (max-width: 800px) { .rand-grid { grid-template-columns: 1fr; } }

.rand-big-btns { display: flex; gap: 8px; margin-bottom: 14px; }
.big-btn { padding: 10px 20px; font-size: 0.95rem; font-weight: 700; border-radius: var(--radius); }
.green-btn { background: #0f2e1a; border-color: #2a7a3a; color: var(--green); }
.green-btn:hover, .green-btn.active { background: var(--green); color: #000; }
.red-btn { background: #2d1010; border-color: #7a2020; color: var(--accent2); }
.red-btn:hover { background: var(--accent2); color: #fff; }

.rand-mode-btns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  margin-bottom: 10px;
}
.mode-btn {
  padding: 10px;
  text-align: left;
  font-size: 0.78rem;
  line-height: 1.4;
  background: var(--bg-inset);
}
.mode-btn small { color: var(--dim); display: block; font-size: 0.68rem; }
.mode-btn.active { background: var(--accent); border-color: var(--glow); color: #fff; }
.mode-btn.active small { color: rgba(255,255,255,0.7); }

.rand-status { font-size: 0.75rem; color: var(--dim); margin-top: 10px; }
#rand-status { color: var(--green); font-weight: 600; margin-left: 4px; }
.rand-note-flash { color: var(--glow); font-weight: 700; margin-left: 8px; }

/* ══════════════════════════════════════════════════════════
   KEYBOARD
══════════════════════════════════════════════════════════ */
.keyboard-section {
  background: #090d0b;
  border-top: 1px solid var(--border);
  padding: 8px 8px 10px;
}
.kbd-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 8px; flex-wrap: wrap; gap: 8px;
}
.kbd-title { font-size: 0.76rem; text-transform: uppercase; letter-spacing: 2px; color: var(--dim); }
.kbd-controls { display: flex; align-items: center; gap: 8px; font-size: 0.85rem; }
.kbd-controls .small { color: var(--dim); font-size: 0.82rem; }
.kbd-controls strong { color: var(--bright); min-width: 22px; text-align: center; font-size: 1rem; }
.kbd-hint { color: var(--dim); font-size: 0.75rem; font-style: italic; }

.piano {
  display: flex;
  position: relative;
  height: 124px;
  user-select: none;
  overflow-x: auto;
  /* 5.1 octaves × 7 white keys = 36 white keys × 32px ≈ 1152px — fits 1200+ screens */
}
.key {
  position: relative;
  cursor: pointer;
  border-radius: 0 0 4px 4px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  padding-bottom: 5px;
  transition: background 0.04s;
}
.key.white {
  width: 32px; height: 124px;
  background: linear-gradient(180deg, #dde 0%, #f9f9fb 100%);
  border: 1px solid #aab;
  flex-shrink: 0;
  z-index: 1;
}
.key.white:hover  { background: linear-gradient(180deg, #cce 0%, #eef 100%); }
.key.white.active { background: linear-gradient(180deg, var(--accent) 0%, var(--glow) 100%); }
/* Subtle teal tint on keys within the current keyboard-shortcut octave */
.key.white.kb-range  { background: linear-gradient(180deg, #c8ddd8 0%, #eef8f5 100%); }
.key.white.kb-range:hover { background: linear-gradient(180deg, #b8d0ca 0%, #e0f0eb 100%); }

.key.black {
  width: 20px; height: 76px;
  background: linear-gradient(180deg, #242430 0%, #16161e 100%);
  border: 1px solid #111;
  margin-left: -10px;
  margin-right: -10px;
  z-index: 2;
  flex-shrink: 0;
  justify-content: flex-end;
  padding-bottom: 4px;
}
.key.black:hover  { background: linear-gradient(180deg, #343448 0%, #242430 100%); }
.key.black.active { background: linear-gradient(180deg, var(--accent) 0%, #3030e0 100%); }
.key.black.kb-range { background: linear-gradient(180deg, #1e3030 0%, #122020 100%); }

/* Key label: note name + keyboard hint */
.key-label { display: flex; flex-direction: column; align-items: center; gap: 0; line-height: 1; }
.key-note {
  font-size: 0.72rem;
  font-weight: 700;
  color: #7a9a94;
  line-height: 1;
}
.key.white.active .key-note { color: #fff; }
.key-hint {
  font-size: 0.6rem;
  color: #b0b0c8;
  line-height: 1;
  margin-top: 2px;
}
.key.white.active .key-hint { color: rgba(255,255,255,0.9); }
.key.black .key-hint {
  font-size: 0.55rem;
  color: #3a5050;
  font-weight: 700;
}
.key.black.kb-range .key-hint { color: #4a8070; }
.key.black.active .key-hint   { color: rgba(255,255,255,0.85); }

/* ── Quality panel ───────────────────────────────────────── */
.quality-meters {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 8px;
  margin-bottom: 10px;
}
.meter-col {
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.meter-label { font-size: 0.74rem; text-transform: uppercase; letter-spacing: 1px; color: var(--dim); }
.meter-bar-wrap {
  height: 6px;
  background: var(--bg);
  border-radius: 3px;
  border: 1px solid var(--border);
  overflow: hidden;
}
.meter-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent) 0%, var(--glow) 70%, var(--accent2) 100%);
  border-radius: 3px;
  width: 0%;
  transition: width 0.1s;
}
.meter-val { font-size: 0.68rem; color: var(--text); }
.meter-val.big { font-size: 0.85rem; font-weight: 600; color: var(--glow); }

/* ── macOS traffic-light offset ─────────────────────────── */
body.macos-titlebar header {
  padding-left: 80px; /* leave room for traffic lights */
}

/* ── Footer ──────────────────────────────────────────────── */
footer {
  text-align: center;
  padding: 8px;
  font-size: 0.68rem;
  color: var(--dim);
  border-top: 1px solid var(--border);
}

/* ══════════════════════════════════════════════════════════
   RENDER TAB
══════════════════════════════════════════════════════════ */
.render-layout {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--gap);
  align-items: start;
}
@media (max-width: 900px) { .render-layout { grid-template-columns: 1fr; } }

/* Drop zone */
.render-dropzone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  background: var(--bg-inset);
  padding: 24px 16px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  margin-top: 8px;
}
.render-dropzone:hover, .render-dropzone.drag-over {
  border-color: var(--accent);
  background: rgba(91,103,216,0.08);
}
.rdz-icon { font-size: 2rem; margin-bottom: 8px; }
.rdz-main { font-size: 0.82rem; color: var(--bright); font-weight: 600; }
.rdz-sub  { font-size: 0.72rem; color: var(--dim); margin-top: 3px; }

/* MIDI info */
.render-info { margin-top: 12px; }
.ri-row { display: flex; justify-content: space-between; align-items: baseline;
          font-size: 0.75rem; padding: 3px 0; border-bottom: 1px solid var(--border); }
.ri-lbl { color: var(--dim); }
.ri-row span:last-child { color: var(--bright); font-variant-numeric: tabular-nums; }

/* Settings select */
.rsel {
  background: var(--bg-inset); border: 1px solid var(--border);
  color: var(--text); border-radius: var(--r-sm); padding: 3px 6px;
  font-size: 0.8rem; cursor: pointer;
}
.rsel:focus { border-color: var(--accent); outline: none; }

/* Render button */
.render-btn {
  width: 100%; padding: 12px; font-size: 0.9rem; font-weight: 700;
  background: linear-gradient(135deg, var(--accent) 0%, #3d4fb8 100%);
  color: #fff; border: none; border-radius: var(--radius); cursor: pointer;
  letter-spacing: 0.05em; transition: opacity 0.15s, transform 0.1s;
  margin-bottom: 14px;
}
.render-btn:hover:not(:disabled) { opacity: 0.88; transform: translateY(-1px); }
.render-btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* Progress */
.render-progress-wrap { margin-bottom: 14px; }
.render-progress-bar {
  height: 6px; background: var(--bg-inset); border-radius: 3px;
  overflow: hidden; border: 1px solid var(--border);
}
.render-progress-fill {
  height: 100%; width: 0%; background: var(--accent);
  border-radius: 3px; transition: width 0.3s;
  box-shadow: 0 0 8px var(--glow);
}
.render-status-msg {
  font-size: 0.72rem; color: var(--dim); margin-top: 5px; text-align: center;
}

/* Download */
.render-download-btn {
  display: block; text-align: center; padding: 10px;
  background: rgba(79,201,126,0.15); border: 1px solid var(--green);
  color: var(--green); border-radius: var(--radius); text-decoration: none;
  font-size: 0.88rem; font-weight: 700; transition: background 0.15s;
  margin-bottom: 8px;
}
.render-download-btn:hover { background: rgba(79,201,126,0.28); }
.render-file-info {
  font-size: 0.7rem; color: var(--dim); text-align: center;
}

/* ── Session Recorder ────────────────────────────────────── */
.rec-layout {
  display: flex; gap: var(--gap); flex-wrap: wrap; padding: var(--gap);
}
.rec-transport-panel, .rec-io-panel { min-width: 240px; flex: 1; }

.rec-transport {
  display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 12px;
}
.rec-btn {
  padding: 10px 16px; border: none; border-radius: var(--radius);
  font-size: 0.85rem; font-weight: 700; cursor: pointer; transition: opacity 0.15s, background 0.15s;
}
.rec-btn:disabled { opacity: 0.38; cursor: not-allowed; }
.rec-btn-record { background: var(--accent2); color: #fff; }
.rec-btn-record.rec-active { background: #c0392b; box-shadow: 0 0 10px rgba(192,57,43,0.7); }
.rec-btn-stop   { background: #555; color: #fff; }
.rec-btn-play   { background: rgba(79,201,126,0.2); border: 1px solid var(--green); color: var(--green); }

.rec-status-row {
  display: flex; align-items: center; gap: 8px; margin-bottom: 10px;
  font-size: 0.8rem; color: var(--dim);
}
.rec-indicator {
  width: 10px; height: 10px; border-radius: 50%; background: #555;
  transition: background 0.2s;
}
.rec-dot-active { background: var(--accent2) !important; box-shadow: 0 0 6px var(--accent2); animation: recpulse 1s infinite; }
@keyframes recpulse { 0%,100% { opacity:1; } 50% { opacity:0.4; } }

.rec-info { margin-top: 8px; }

.rec-io-btns {
  display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px;
}
.rec-text-input {
  flex: 1; background: var(--bg-inset); border: 1px solid var(--border);
  color: var(--text); padding: 4px 8px; border-radius: var(--r-sm);
  font-size: 0.82rem; min-width: 0;
}
.rec-load-label {
  display: inline-block; cursor: pointer;
}

/* ── Spectral / FrFT Tab ─────────────────────────────────── */
.spectral-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--gap);
}

.spectral-header-panel {
  grid-column: 1 / -1;
}

.spectral-desc {
  font-size: 0.78rem;
  color: var(--dim);
  line-height: 1.55;
  margin-bottom: 10px;
}

.spectral-op-panel h2 sub {
  font-size: 0.65em;
  vertical-align: sub;
}

/* ── Microtonal Tab ──────────────────────────────────────── */
.micro-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
}

@media (max-width: 700px) {
  .micro-grid { grid-template-columns: 1fr; }
}

.micro-cents-table {
  display: flex;
  flex-direction: column;
  gap: 3px;
  margin-top: 8px;
  max-height: 400px;
  overflow-y: auto;
}

.micro-degree-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 3px 6px;
  border-radius: 4px;
  font-size: 0.78rem;
  background: var(--bg-inset);
  border: 1px solid var(--border);
}

.micro-deg {
  width: 22px;
  text-align: center;
  color: var(--accent);
  font-weight: bold;
  flex-shrink: 0;
}

.micro-cents {
  width: 90px;
  font-family: monospace;
  color: var(--glow);
  flex-shrink: 0;
}

.micro-label {
  color: var(--dim);
  font-size: 0.73rem;
}