:root {
  --bg:          #2e3440;
  --surface:     #3b4252;
  --surface-2:   #434c5e;
  --surface-3:   #4c566a;
  --border:      #4c566a;
  --border-2:    #5e6a82;
  --text:        #eceff4;
  --text-2:      #d8dee9;
  --text-muted:  #7b88a1;
  --accent:      #88c0d0;
  --accent-dim:  #81a1c1;
  --accent-glow: rgba(136, 192, 208, 0.12);
  --green:       #a3be8c;
  --red:         #bf616a;
  --font:        'Oxanium', sans-serif;
  --radius:      6px;
  --pad-bg:      #252a33;
}

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

html { font-size: 13px; }
html, body { height: 100%; overflow: hidden; }
body { font-family: var(--font); background: var(--bg); color: var(--text); display: flex; flex-direction: column; }

/* ── Header ── */

.header {
  height: 4rem;
  display: flex;
  align-items: center;
  padding: 0 1.4rem;
  gap: 1.4rem;
  flex-shrink: 0;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.logo { font-family: 'Plaster', sans-serif; font-size: 2.4rem; margin-right: auto; }

.btn-primary, .btn-secondary, .btn-connect {
  height: 2.4rem;
  border-radius: var(--radius);
  font-family: var(--font);
  font-size: 0.85rem;
  text-transform: uppercase;
  cursor: pointer;
  flex-shrink: 0;
  transition: all 0.15s;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg);
  border: none;
  padding: 0 1.2rem;
  letter-spacing: 0.15em;
  font-weight: 500;
}
.btn-primary:hover  { opacity: 0.85; }
.btn-primary:active { opacity: 0.7; }

.btn-secondary, .btn-connect {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
  padding: 0 0.9rem;
  letter-spacing: 0.1em;
}
.btn-primary:disabled, .btn-secondary:disabled { opacity: 0.35; cursor: not-allowed; }

.btn-secondary:hover    { color: var(--text-2); border-color: var(--border-2); }
.btn-connect:hover      { color: var(--accent); border-color: var(--accent-dim); }
.btn-connect.connected  { color: var(--red); border-color: var(--red); }

/* ── Layout ── */

.layout { display: flex; flex: 1; overflow: hidden; }

.sidebar {
  width: 11rem;
  display: flex;
  flex-direction: column;
  padding: 1.2rem 0;
  gap: 2px;
  flex-shrink: 0;
  background: var(--surface);
  border-right: 1px solid var(--border);
}

.nav-item {
  padding: 0.65rem 1.4rem;
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-muted);
  cursor: pointer;
  border-left: 2px solid transparent;
  transition: color 0.1s, border-color 0.1s, background 0.1s;
  user-select: none;
}
.nav-item:hover  { color: var(--text-2); }
.nav-item.active { color: var(--accent); border-left-color: var(--accent); background: var(--accent-glow); }

/* ── Panels ── */

.panel { flex: 1; overflow-y: auto; padding: 2rem 2.2rem; display: none; }
.panel.active { display: block; }
.panel > * { max-width: 66%; }

.panel-title {
  font-size: 0.8rem;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.6rem;
  padding-bottom: 0.7rem;
  border-bottom: 1px solid var(--border);
}

.two-column { display: grid; grid-template-columns: 1fr 1fr; gap: 1.7rem; }
@media (max-width: 900px) { .two-column { grid-template-columns: 1fr; } }

.field-group { margin-bottom: 1.8rem; }

.field-label {
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.55rem;
}

/* ── Segment / toggle controls ── */

.segment, .sim-mode-buttons { display: flex; gap: 3px; flex-wrap: wrap; }

.segment-btn {
  padding: 0.4rem 1rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-2);
  font-family: var(--font);
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: all 0.1s;
}
.segment-btn:hover { border-color: var(--border-2); color: var(--text); }

/* Shared active state for toggle elements */
.segment-btn.on, .channel-btn.on {
  background: var(--accent-glow);
  border-color: var(--accent);
  color: var(--accent);
}

/* ── Channel grid ── */

.channel-grid, .quick-ccs { display: flex; gap: 3px; flex-wrap: wrap; }

.channel-btn {
  width: 2.2rem;
  height: 2.2rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--surface-2);
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 0.85rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.1s;
}
.channel-btn:hover { border-color: var(--border-2); }

/* ── CC controls ── */

.cc-row { display: flex; align-items: center; gap: 0.7rem; margin-bottom: 0.55rem; }

/* Shared input base */
.midi-device-select {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--font);
  outline: none;
  transition: border-color 0.1s;
}
.midi-device-select:focus { border-color: var(--accent); }

.cc-field {
  display: flex;
  align-items: center;
  height: 3rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 0.1s;
}
.cc-field:focus-within { border-color: var(--accent); }

.cc-step {
  width: 1.6rem;
  height: 100%;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.4rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.1s, background 0.1s;
  flex-shrink: 0;
}
.cc-step:hover { color: var(--text); background: var(--surface-3); }

.cc-input {
  width: 3.2rem;
  height: 100%;
  color: var(--text);
  font-family: var(--font);
  font-size: 1.5rem;
  text-align: center;
  background: transparent;
  border: none;
  outline: none;
  -moz-appearance: textfield;
}
.cc-input::-webkit-inner-spin-button,
.cc-input::-webkit-outer-spin-button { -webkit-appearance: none; }

.midi-device-select {
  width: 100%;
  color: var(--text-2);
  font-size: 0.9rem;
  padding: 0.4rem 0.7rem;
  appearance: none;
  -webkit-appearance: none;
}

.cc-name { font-size: 0.9rem; color: var(--accent); letter-spacing: 0.06em; font-style: italic; min-width: 8rem; }

/* ── Chip buttons (quick-cc, root note, preset) ── */

.quick-cc-btn, .root-btn, .preset-btn {
  padding: 3px 0.6rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.1s;
}
.quick-cc-btn { letter-spacing: 0.06em; white-space: nowrap; }
.preset-btn   { letter-spacing: 0.06em; }
.quick-cc-btn:hover, .root-btn:hover, .preset-btn:hover { color: var(--text-2); border-color: var(--border-2); }
.quick-cc-btn.on, .root-btn.on { background: var(--accent-glow); border-color: var(--accent-dim); color: var(--accent); }

/* ── Slider ── */

.slider-wrap { display: flex; align-items: center; gap: 0.9rem; flex: 1; }

.slider-wrap input[type="range"] {
  -webkit-appearance: none;
  flex: 1;
  height: 2px;
  background: var(--border-2);
  border-radius: 1px;
  outline: none;
}
.slider-wrap input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 1rem;
  height: 1rem;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
}
.slider-value { font-size: 1rem; color: var(--text); min-width: 4rem; text-align: right; }

/* ── Scale / chromatic ── */

.chromatic-grid, .root-notes, .scale-presets { display: flex; gap: 3px; flex-wrap: wrap; margin-bottom: 1rem; }

.note-key { display: flex; flex-direction: column; align-items: center; gap: 3px; cursor: pointer; }

.note-circle {
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface-2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  color: var(--text-muted);
  transition: all 0.1s;
}
.note-key.sharp .note-circle { background: var(--surface-3); }
.note-key.on .note-circle    { background: var(--accent-glow); border-color: var(--accent); color: var(--accent); }
.note-key.root .note-circle  { background: var(--accent); border-color: var(--accent); color: var(--bg); }
.note-key:hover .note-circle { border-color: var(--border-2); }
.note-label { font-size: 0.6rem; color: var(--text-muted); }

/* ── Device card ── */

.device-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-2);
  padding: 1.1rem;
  margin-bottom: 1.1rem;
}

.device-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--border);
}
.device-row:last-child { border-bottom: none; }
.device-key, .device-value { font-size: 0.85rem; }
.device-key   { color: var(--text-muted); }
.device-value { color: var(--text-2); }

/* ── Live panel visualizer ── */

.live-viz {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.9rem;
}

.preview-inner { display: flex; gap: 0.5rem; align-items: flex-start; }

.leds-y { display: flex; flex-direction: column; justify-content: space-evenly; height: 300px; }
.leds-x { display: flex; gap: 3px; width: 300px; justify-content: space-evenly; margin-top: 8px; }

.pad {
  width: 300px;
  height: 300px;
  background: var(--pad-bg);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  cursor: default;
  position: relative;
  overflow: hidden;
  user-select: none;
  touch-action: none;
  flex-shrink: 0;
}

.pad-cursor {
  position: absolute;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: rgba(136, 192, 208, 0.25);
  border: 1px solid rgba(136, 192, 208, 0.6);
  transform: translate(-50%, -50%);
  display: none;
  pointer-events: none;
}

.led { width: 7px; height: 7px; border-radius: 50%; flex-shrink: 0; transition: background 0.04s; }

.pad-values { display: flex; width: 100%; border-top: 1px solid var(--border); padding-top: 0.7rem; }
.value-box  { flex: 1; padding: 0 0.4rem; }
.value-box:first-child { border-right: 1px solid var(--border); }
.value-axis   { font-size: 0.7rem; letter-spacing: 0.2em; color: var(--text-muted); text-transform: uppercase; margin-bottom: 3px; }
.value-number { font-size: 1.7rem; font-weight: 500; color: var(--text); line-height: 1; }
.value-cc     { font-size: 0.7rem; color: var(--accent); margin-top: 2px; letter-spacing: 0.04em; }

/* ── Firmware update ── */

.fw-row { display: flex; align-items: center; gap: 0.7rem; margin-bottom: 0.5rem; }
.fw-pick-btn { display: inline-flex; align-items: center; cursor: pointer; }
.fw-filename { font-size: 0.8rem; color: var(--text-muted); }
.fw-hint { font-size: 0.78rem; color: var(--text-muted); line-height: 1.5; margin-bottom: 0.6rem; }
.fw-flash-btn { display: block; }

/* ── Log drawer ── */

.log-drawer {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  z-index: 90;
  display: flex;
  flex-direction: column;
  max-height: 50vh;
  transition: max-height 0.2s;
}
.log-drawer.collapsed { max-height: 2rem; }

.log-tab {
  height: 2rem;
  background: var(--surface-3);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 1.1rem;
  gap: 0.9rem;
  cursor: pointer;
  flex-shrink: 0;
  user-select: none;
}

.log-title { font-size: 0.8rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--text-muted); }
.log-count { font-size: 0.8rem; color: var(--accent); letter-spacing: 0.08em; }
.log-arrow { font-size: 0.7rem; color: var(--text-muted); margin-left: auto; transition: transform 0.2s; }
.log-drawer.collapsed .log-arrow { transform: rotate(180deg); }

.log-body {
  flex: 1;
  overflow-y: auto;
  background: #1a1e26;
  padding: 0.55rem 1.1rem;
  font-size: 0.85rem;
  line-height: 1.7;
  color: #7b88a1;
}
.log-body .rx  { color: #a3be8c; }
.log-body .tx  { color: #88c0d0; }
.log-body .sys { color: #ebcb8b; }
.log-body .err { color: #bf616a; }
.log-body .ts  { color: #4c566a; margin-right: 0.55rem; }

.log-clear-btn {
  font-size: 0.8rem;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 0.55rem;
  cursor: pointer;
  font-family: var(--font);
  letter-spacing: 0.08em;
}
.log-clear-btn:hover { color: var(--text-2); border-color: var(--border-2); }

/* ── Toast ── */

.toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(16px);
  background: var(--surface-3);
  border: 1px solid var(--border-2);
  border-radius: var(--radius);
  padding: 0.55rem 1.3rem;
  font-size: 0.9rem;
  color: var(--text-2);
  letter-spacing: 0.08em;
  opacity: 0;
  transition: all 0.2s;
  pointer-events: none;
  z-index: 100;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.ok   { color: var(--green); border-color: var(--green); }
.toast.err  { color: var(--red);   border-color: var(--red); }

/* ── Scrollbar ── */

::-webkit-scrollbar       { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-2); border-radius: 2px; }