:root {
  --bg: #0e0e12;
  --panel: #17171d;
  --panel-2: #1f1f27;
  --border: #2c2c36;
  --text: #ececf0;
  --text-dim: #9a9a9a;
  --accent: #e8732c;       /* Roland orange */
  --accent-green: #3fb950;
  --accent-orange: #e8732c;
  --radius: 8px;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --mono: 'SF Mono', 'JetBrains Mono', Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.4;
  min-height: 100vh;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: #000;
  padding: 8px 14px;
  z-index: 100;
  border-radius: 0 0 var(--radius) 0;
}
.skip-link:focus { left: 0; }

/* ===== Header ===== */
.main-header {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  padding: 10px 16px;
  background: linear-gradient(180deg, #1c1c24, var(--panel));
  border-bottom: 1px solid var(--border);
}
.header-left { display: flex; align-items: baseline; gap: 10px; }
.logo {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--accent);
}
.subtitle { color: var(--text-dim); font-size: 12px; text-transform: uppercase; letter-spacing: 1px; }
.header-center { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.header-sep { width: 1px; height: 22px; background: var(--border); margin: 0 4px; }

.midi-panel { display: flex; align-items: center; gap: 8px; margin-left: auto; flex-wrap: wrap; }
.dev-label { color: var(--text-dim); font-size: 12px; }

.midi-btn {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 6px 12px;
  font-size: 13px;
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s;
}
.midi-btn:hover:not(:disabled) { background: #2a2a34; border-color: #3a3a46; }
.midi-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.midi-btn:disabled { opacity: 0.45; cursor: not-allowed; }
.midi-btn.small { padding: 3px 9px; font-size: 12px; }
.midi-btn.accent-green { border-color: var(--accent-green); }
.midi-btn.accent-orange { border-color: var(--accent-orange); }

.midi-select {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 6px 8px;
  font-size: 13px;
  max-width: 180px;
}
.midi-select:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.midi-status {
  width: 11px; height: 11px; border-radius: 50%;
  display: inline-block; border: 1px solid var(--border);
}
.midi-status.connected { background: var(--accent-green); box-shadow: 0 0 6px var(--accent-green); }
.midi-status.disconnected { background: #555; }

.midi-led-group { display: flex; gap: 4px; }
.midi-led { color: #444; font-size: 12px; transition: color 0.08s; }
.midi-led.active.midi-led-in { color: var(--accent-green); }
.midi-led.active.midi-led-out { color: var(--accent); }

/* ===== Tabs ===== */
.tabs {
  display: flex;
  gap: 2px;
  padding: 0 16px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}
.tab {
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-dim);
  padding: 10px 16px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.5px;
  cursor: pointer;
}
.tab:hover { color: var(--text); }
.tab.active { color: var(--accent); border-bottom-color: var(--accent); }
.tab:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }

/* ===== Panels / cards ===== */
main { padding: 16px; max-width: 1100px; margin: 0 auto; }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin-bottom: 16px;
}
.card-title {
  margin: 0 0 12px;
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent);
}

.field { display: flex; flex-direction: column; gap: 4px; max-width: 220px; }
.field span { color: var(--text-dim); font-size: 12px; }
.field input[type="text"] {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  padding: 7px 10px;
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: 1px;
}
.field input:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

/* ===== Knobs ===== */
.knob-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(92px, 1fr));
  gap: 18px 10px;
}
.knob-wrap { display: flex; flex-direction: column; align-items: center; gap: 4px; }
.knob {
  width: 48px; height: 48px;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 35%, #34343f, #1a1a20);
  border: 2px solid var(--border);
  position: relative;
  cursor: ns-resize;
}
.knob::after {
  content: '';
  position: absolute;
  left: 50%; top: 6px;
  width: 2px; height: 14px;
  background: var(--accent);
  transform: translateX(-50%);
  transform-origin: 50% 18px;
  border-radius: 2px;
}
.knob.active, .knob:focus-visible { border-color: var(--accent); outline: none; }
.knob-value { font-family: var(--mono); font-size: 12px; color: var(--text); }
.knob-label { font-size: 11px; color: var(--text-dim); text-align: center; }

/* ===== Monitor ===== */
.monitor-bar { display: flex; align-items: center; gap: 12px; margin-bottom: 10px; }
.monitor-meta { color: var(--text-dim); font-size: 12px; margin-left: auto; }
.monitor-log {
  font-family: var(--mono);
  font-size: 12px;
  background: #0a0a0e;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  height: 360px;
  overflow-y: auto;
  padding: 8px 10px;
}
.mon-row { white-space: pre; padding: 1px 0; }
.mon-in { color: var(--accent-green); }
.mon-out { color: var(--accent); }

/* ===== Footer ===== */
.main-footer {
  display: flex;
  justify-content: space-between;
  padding: 12px 16px;
  color: var(--text-dim);
  font-size: 12px;
  border-top: 1px solid var(--border);
}
.footer-version { font-family: var(--mono); }

@media (max-width: 720px) {
  .midi-panel { margin-left: 0; width: 100%; }
  .header-center { width: 100%; }
}

/* ===== Tone sub-tabs (#1167) ===== */
.tone-card { padding-top: 8px; }
.subtabs {
  display: flex;
  gap: 4px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 12px;
}
.subtab {
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-dim);
  font: inherit;
  font-size: 13px;
  letter-spacing: 1px;
  padding: 8px 14px;
  cursor: pointer;
}
.subtab:hover { color: var(--text); }
.subtab.active { color: var(--accent); border-bottom-color: var(--accent); }
.subtab:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
.tone-panel { display: none; }
.tone-panel.active { display: block; }
.tone-panel .card { background: var(--panel-2); }

/* ===== Enumerated param selects ===== */
.select-ctl {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  justify-content: flex-end;
}
.param-select {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-family: var(--mono);
  font-size: 12px;
  padding: 4px 6px;
  max-width: 120px;
}
.param-select:hover { border-color: #3a3a46; }
.param-select:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

/* ===== EG graphs ===== */
.eg-box { margin: 4px 0 10px; }
.eg-graph {
  width: 100%;
  max-width: 420px;
  height: 64px;
  display: block;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
}
.eg-axis { stroke: var(--border); stroke-width: 1; }
.eg-line { fill: none; stroke: var(--accent); stroke-width: 1.6; }
.eg-fill { fill: rgba(232, 115, 44, 0.12); stroke: none; }
.eg-relmark { stroke: var(--text-dim); stroke-width: 1; stroke-dasharray: 3 3; }

/* Boot guard: the browser may paint the parsed DOM before the body-end
   scripts build the param controls; an early paint of empty containers +
   footer followed by the filled page is a massive CLS hit. Hide everything
   below the header until app.js finishes the synchronous render, so content
   first appears in its final layout. */
.booting #main-content,
.booting .main-footer { visibility: hidden; }