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

:root {
  --bg: #0d0d1a;
  --panel: rgba(255,255,255,0.05);
  --border: rgba(255,255,255,0.1);
  --accent: #00d9ff;
  --accent-dim: rgba(0,217,255,0.15);
  --text: #e0e6f0;
  --text-dim: #7a8599;
  --danger: #ff4d6d;
  --success: #00d9a0;
  --warning: #ffd166;
  --white-key: #e8edf2;
  --white-key-hover: #b0e0f0;
  --white-key-active: #00d9ff;
  --black-key: #1a1a2e;
  --black-key-hover: #2a3a5a;
  --black-key-active: #0099cc;
  --key-border: #12465a;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, sans-serif;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ── Header ── */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.5rem;
  border-bottom: 1px solid var(--border);
  background: rgba(0,0,0,0.3);
  flex-shrink: 0;
}
.brand {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--accent);
}
#status-badge {
  font-size: 0.8rem;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--text-dim);
  transition: all 0.3s;
}
#status-badge.connected    { color: var(--success); border-color: var(--success); }
#status-badge.connecting   { color: var(--warning); border-color: var(--warning); }
#status-badge.disconnected { color: var(--text-dim); border-color: var(--border); }

/* ── Layout ── */
main {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* ── Sidebar ── */
aside#control-panel {
  width: 280px;
  min-width: 280px;
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
aside#control-panel::-webkit-scrollbar { width: 4px; }
aside#control-panel::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

.panel-section {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
}
.panel-section h3 {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 0.75rem;
}

/* ── Inputs / Buttons ── */
input[type=text], input[type=range] {
  width: 100%;
  background: rgba(0,0,0,0.3);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: 0.5rem 0.75rem;
  font-size: 0.85rem;
  outline: none;
}
input[type=text]:focus { border-color: var(--accent); }

button {
  cursor: pointer;
  border: none;
  border-radius: 6px;
  font-size: 0.85rem;
  padding: 0.5rem 1rem;
  background: var(--accent-dim);
  color: var(--accent);
  border: 1px solid rgba(0,217,255,0.3);
  transition: background 0.2s;
}
button:hover { background: rgba(0,217,255,0.25); }
button.primary { background: var(--accent); color: #000; font-weight: 600; }
button.primary:hover { background: #33e5ff; }
button.danger { background: rgba(255,77,109,0.15); color: var(--danger); border-color: rgba(255,77,109,0.3); }

#section-connect { display: flex; flex-direction: column; gap: 0.5rem; }

/* ── Drop Zone ── */
#drop-zone {
  border: 2px dashed var(--border);
  border-radius: 8px;
  padding: 1.5rem 1rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-dim);
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  line-height: 1.6;
}
#drop-zone:hover, #drop-zone.drag-over {
  border-color: var(--accent);
  background: var(--accent-dim);
  color: var(--accent);
}

#midi-controls { margin-top: 0.75rem; display: flex; flex-direction: column; gap: 0.5rem; }
#midi-filename { font-size: 0.8rem; color: var(--text-dim); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.midi-transport { display: flex; gap: 0.5rem; align-items: center; }
.midi-transport button { padding: 0.4rem 0.7rem; font-size: 0.9rem; }

.progress-wrap { position: relative; flex: 1; height: 14px; display: flex; align-items: center; }
.progress-track {
  position: absolute;
  left: 0; right: 0;
  height: 6px;
  border-radius: 3px;
  background: var(--border);
  pointer-events: none;
}
.progress-fill {
  position: absolute;
  left: 0;
  height: 6px;
  border-radius: 3px;
  background: var(--accent);
  pointer-events: none;
}
.progress-thumb {
  position: absolute;
  top: 50%;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  transform: translate(-50%, -50%);
  pointer-events: none;
}
#midi-progress {
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  position: relative;
  z-index: 1;
  width: 100%;
  height: 14px;
  margin: 0;
  background: transparent;
  outline: none;
  cursor: pointer;
}
#midi-progress::-webkit-slider-thumb { -webkit-appearance: none; width: 14px; height: 14px; background: transparent; border: none; }
#midi-progress::-moz-range-thumb { width: 14px; height: 14px; background: transparent; border: none; }
#midi-progress::-moz-range-track { background: transparent; border: none; }

/* ── Device list ── */
.device-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.4rem 0;
  font-size: 0.82rem;
  border-bottom: 1px solid var(--border);
}
.device-item:last-child { border-bottom: none; }
.device-toggle {
  width: 36px; height: 20px;
  border-radius: 10px;
  background: var(--border);
  border: none;
  cursor: pointer;
  position: relative;
  transition: background 0.2s;
  padding: 0;
}
.device-toggle::after {
  content: '';
  position: absolute;
  top: 3px; left: 3px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--text-dim);
  transition: transform 0.2s, background 0.2s;
}
.device-toggle.on { background: var(--accent-dim); }
.device-toggle.on::after { transform: translateX(16px); background: var(--accent); }

/* ── Mapping actions ── */
.mapping-actions { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.mapping-actions button, .mapping-actions label {
  font-size: 0.78rem;
  padding: 0.35rem 0.65rem;
  cursor: pointer;
}
.mapping-actions label {
  border-radius: 6px;
  background: var(--accent-dim);
  color: var(--accent);
  border: 1px solid rgba(0,217,255,0.3);
}
.mapping-actions label:hover { background: rgba(0,217,255,0.25); }
input[type=file] { display: none; }

/* ── Piano keyboard area ── */
#keyboard-container {
  flex: 1;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 1rem 0.5rem;
  overflow: hidden;
}

ul#piano-keys {
  list-style: none;
  display: flex;
  position: relative;
  border-top: 30px solid var(--key-border);
  border-left: 6px solid var(--key-border);
  border-right: 6px solid var(--key-border);
  border-bottom: 6px solid var(--key-border);
  border-radius: 10px;
  background: var(--key-border);
}

ul#piano-keys li {
  position: relative;
  cursor: pointer;
  border-radius: 0 0 4px 4px;
  user-select: none;
  transition: background 0.05s;
}

ul#piano-keys li.white {
  height: 200px;
  width: 28px;
  background: linear-gradient(to bottom, #d8e4ea 0%, var(--white-key) 100%);
  border-left: 1px solid #b0bec5;
  border-bottom: 1px solid #b0bec5;
  z-index: 1;
}
ul#piano-keys li.white:hover  { background: var(--white-key-hover); }
ul#piano-keys li.white.note-on { background: var(--white-key-active); }

ul#piano-keys li.black {
  height: 120px;
  width: 18px;
  background: var(--black-key);
  position: relative;
  transform: translateX(-60%);
  z-index: 2;
  border-radius: 0 0 3px 3px;
}
ul#piano-keys li.black:hover  { background: var(--black-key-hover); }
ul#piano-keys li.black.note-on { background: var(--black-key-active); }

/* negative margin trick for black keys */
ul#piano-keys li.e,
ul#piano-keys li.h,
ul#piano-keys li.d,
ul#piano-keys li.g,
ul#piano-keys li.a { margin-left: -18px; }

/* key mapping label */
li .key-label {
  position: absolute;
  bottom: 6px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 9px;
  color: rgba(0,0,0,0.45);
  pointer-events: none;
  white-space: nowrap;
}
li.black .key-label { color: rgba(255,255,255,0.4); bottom: 4px; }
li.mapping-mode .key-label { color: var(--accent); }

/* ── Toast notifications ── */
#toast-container {
  position: fixed;
  top: 4rem;
  right: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  z-index: 100;
  pointer-events: none;
}
.toast {
  padding: 0.6rem 1rem;
  border-radius: 8px;
  font-size: 0.82rem;
  border: 1px solid transparent;
  animation: slide-in 0.3s ease;
  pointer-events: none;
  max-width: 280px;
}
.toast.success { background: rgba(0,217,160,0.15); border-color: var(--success); color: var(--success); }
.toast.danger  { background: rgba(255,77,109,0.15); border-color: var(--danger);  color: var(--danger); }
.toast.warning { background: rgba(255,209,102,0.15); border-color: var(--warning); color: var(--warning); }
.toast.info    { background: rgba(0,217,255,0.15); border-color: var(--accent);  color: var(--accent); }

@keyframes slide-in {
  from { transform: translateX(120%); opacity: 0; }
  to   { transform: translateX(0);    opacity: 1; }
}