:root {
  --bg-deep: #0a0e1a;
  --bg-panel: #0d1220;
  --bg-surface: #111827;
  --bg-waveform: #0a0e1a;
  --border: #1e293b;
  --text: #e2e8f0;
  --text-dim: #64748b;
  --accent: #00d4ff;
  --trace-1: #00ff88;
  --trace-2: #ff6b9d;
  --trace-3: #ffd700;
  --trace-4: #a78bfa;
  --trace-5: #fb923c;
  --trace-6: #34d399;
  --trace-7: #f87171;
  --stage-w: #34d399;
  --stage-n1: #7dd3fc;
  --stage-n2: #3b82f6;
  --stage-n3: #1e3a5f;
  --stage-rem: #f472b6;
  --stage-mt: #525252;
  --stage-unknown: #374151;
  --grid: rgba(255,255,255,0.04);
  --grid-major: rgba(255,255,255,0.08);
}

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

body {
  background: var(--bg-deep);
  color: var(--text);
  font-family: 'DM Sans', sans-serif;
  overflow: hidden;
  height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 20px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  min-height: 32px;
}
.header-left { display: flex; align-items: center; gap: 16px; }
.logo {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 500; font-size: 14px;
  color: var(--accent); letter-spacing: 2px; text-transform: uppercase;
}
.meta {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; color: var(--text-dim); display: flex; gap: 12px;
}
.meta span { color: var(--text); }
.btn {
  font-family: 'DM Sans', sans-serif; font-size: 11px; font-weight: 500;
  padding: 3px 10px; border: 1px solid var(--border);
  background: var(--bg-surface); color: var(--text);
  border-radius: 4px; cursor: pointer; transition: all 0.15s;
  height: 24px; box-sizing: border-box; line-height: 1;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }

/* Drop zone */
.dropzone {
  flex: 1; display: flex; align-items: center; justify-content: center;
  flex-direction: column; gap: 12px; border: 2px dashed var(--border);
  margin: 40px; border-radius: 8px; transition: border-color 0.2s;
}
.dropzone.active { border-color: var(--accent); }
.dropzone-text { font-family: 'JetBrains Mono', monospace; font-size: 13px; color: var(--text-dim); }
.dropzone-hint { font-size: 11px; color: var(--text-dim); opacity: 0.5; }

/* Viewer */
.viewer { display: none; flex: 1; flex-direction: column; overflow: hidden; }
.viewer.active { display: flex; }

/* Hypnogram */
.hypnogram-container { padding: 4px 20px 0 20px; background: var(--bg-panel); border-bottom: 1px solid var(--border); }
.hypnogram-label {
  font-family: 'JetBrains Mono', monospace; font-size: 12px;
  color: var(--text-dim); margin-bottom: 5px; padding-top: 2px; display: flex; align-items: center; gap: 6px;
}
.hypno-label-sep { color: var(--border); margin: 0 2px; user-select: none; }
.hypno-label-dim { font-size: 10px; color: var(--text-dim); user-select: none; }
.hypnogram-body { display: flex; align-items: stretch; height: var(--hypno-height, 50px); }
.hypnogram-yaxis {
  position: relative; margin-right: 6px; font-family: 'JetBrains Mono', monospace;
  font-size: 11px !important; font-weight: 600; min-width: 22px;
}
.hypnogram-yaxis span { font-size: 11px !important; white-space: nowrap; line-height: 1; }
#hypnogramCanvas { flex: 1; height: 100%; cursor: pointer; border-radius: 2px; }
.hypnogram-timeaxis { display: flex; height: 14px; }
.hypnogram-timeaxis canvas { flex: 1; height: 14px; }
.hypnogram-resize { height: 6px; cursor: ns-resize; display: flex; align-items: center; justify-content: center; }
.hypnogram-resize::after { content: ''; width: 40px; height: 2px; background: var(--border); border-radius: 1px; }

/* Context menu */
.ctx-menu {
  display: none; position: fixed; background: var(--bg-panel); border: 1px solid var(--border);
  border-radius: 6px; padding: 4px 0; z-index: 300; box-shadow: 0 4px 16px rgba(0,0,0,0.4);
  font-family: 'JetBrains Mono', monospace; font-size: 11px; min-width: 140px;
  user-select: none;
}
.ctx-menu.active { display: block; }
.ctx-menu-item { padding: 5px 10px; color: var(--text); cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 10px; }
.ctx-menu-item:hover { background: var(--bg-surface); }
.ctx-menu-item .shortcut { color: var(--text-dim); font-size: 10px; }
.ctx-menu-sep { height: 1px; background: var(--border); margin: 3px 0; }
.ctx-menu-toggle { justify-content: space-between; }
.ctx-menu-toggle .toggle-switch { transform: scale(0.9); }

/* Channel panel controls */
.channel-panel-controls {
  border-top: 1px solid var(--border); padding: 8px 12px;
  font-family: 'JetBrains Mono', monospace; font-size: 10px; color: var(--text-dim);
}
.ch-ctrl-title {
  font-size: 9px; text-transform: uppercase; letter-spacing: 0.5px;
  color: var(--text-dim); margin-bottom: 6px;
}
.ch-ctrl-row { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; }
.ch-ctrl-row:last-child { margin-bottom: 0; }
.ch-ctrl-row label { min-width: 32px; }
.ch-ctrl-row .custom-select { margin-left: auto; }

/* Toggle switch */
.toggle-switch {
  position: relative; display: inline-block; width: 28px; height: 14px; cursor: pointer;
}
.toggle-switch input { opacity: 0; width: 0; height: 0; }
.toggle-slider {
  position: absolute; inset: 0; background: #555; border-radius: 14px;
  transition: background 0.2s;
}
.toggle-slider::before {
  content: ''; position: absolute; width: 10px; height: 10px;
  left: 2px; bottom: 2px; background: #fff; border-radius: 50%;
  transition: transform 0.2s;
}
.toggle-switch input:checked + .toggle-slider { background: var(--accent); }
.toggle-switch input:checked + .toggle-slider::before { transform: translateX(14px); }

/* Custom select dropdown */
.custom-select {
  position: relative; font-family: 'JetBrains Mono', monospace; font-size: 11px;
}
.custom-select-trigger {
  display: flex; align-items: center; gap: 6px; padding: 4px 10px;
  border: 1px solid var(--border); border-radius: 4px; background: var(--bg-surface);
  color: var(--text); cursor: pointer; white-space: nowrap; max-width: 200px;
  transition: border-color 0.15s; user-select: none;
}
.custom-select-sm .custom-select-trigger { padding: 2px 8px; font-size: 10px; width: 68px; justify-content: space-between; }
.custom-select-sm .custom-select-dropdown { font-size: 10px; }
.custom-select-up .custom-select-dropdown { top: auto; bottom: calc(100% + 4px); }
.custom-select-hypno .custom-select-trigger { padding: 2px 8px; font-size: 10px; min-width: 90px; justify-content: space-between; }
.custom-select-hypno .custom-select-dropdown { font-size: 10px; }
.custom-select-trigger:hover { border-color: var(--accent); }
.custom-select-arrow { font-size: 9px; color: var(--text-dim); }
.custom-select-dropdown {
  display: none; position: absolute; top: calc(100% + 4px); right: 0;
  min-width: 100%; max-height: 200px; overflow-y: auto;
  background: var(--bg-panel); border: 1px solid var(--border); border-radius: 4px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.4); z-index: 200; padding: 2px 0;
}
.custom-select.open .custom-select-dropdown { display: block; }
.custom-select-option {
  padding: 5px 10px; color: var(--text); cursor: pointer; white-space: nowrap;
}
.custom-select-option:hover { background: var(--bg-surface); }
.custom-select-option.active { color: var(--accent); }
.custom-select-option.new-anno { color: var(--accent); font-style: italic; border-top: 1px solid var(--border); }

/* Waveform area */
.waveform-container { flex: 1; display: flex; overflow: hidden; }
.waveform-labels {
  width: var(--label-width, 72px); min-width: var(--label-width, 72px);
  background: var(--bg-panel); border-right: 1px solid var(--border);
  overflow: hidden; position: relative;
}
.label-resize { position: absolute; top: 0; right: 0; width: 4px; height: 100%; cursor: ew-resize; z-index: 10; }
.label-resize:hover { background: var(--accent); opacity: 0.3; }
.waveform-label-item {
  position: absolute; left: 0; right: 0; display: flex; flex-direction: column;
  justify-content: center; padding: 0 8px; font-family: 'JetBrains Mono', monospace; overflow: hidden;
}
.waveform-label-name { font-size: 10px; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.waveform-label-info { font-size: 8px; color: var(--text-dim); white-space: nowrap; }
.waveform-label-ticks { position: absolute; top: 0; right: 0; width: 100%; height: 100%; pointer-events: none; }
.waveform-canvas-wrap { flex: 1; position: relative; overflow: hidden; display: flex; flex-direction: column; }
#waveformCanvas, #slowCanvas { width: 100%; flex-shrink: 0; }
.waveform-divider { width: 100%; height: 2px; background: var(--border); flex-shrink: 0; display: none; }
.waveform-divider.active { display: block; }

/* Analysis panel (right side, inline with signals) */
.analysis-panel {
  display: none; width: var(--analysis-width, 300px); min-width: 200px;
  background: var(--bg-panel); border-left: 1px solid var(--border);
  flex-shrink: 0; flex-direction: column; position: relative;
}
.analysis-panel.active { display: flex; }
.analysis-resize {
  position: absolute; top: 0; left: 0; bottom: 0; width: 4px;
  cursor: ew-resize; z-index: 10;
}
.analysis-resize:hover { background: var(--accent); opacity: 0.3; }
.analysis-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 4px 8px; border-bottom: 1px solid var(--border); min-height: 24px;
}
.analysis-tabs { display: flex; gap: 2px; flex: 1; overflow-x: auto; }
.analysis-tab {
  font-family: 'JetBrains Mono', monospace; font-size: 10px; font-weight: 500;
  padding: 2px 8px; border-radius: 3px; cursor: pointer; white-space: nowrap;
  color: var(--text-dim); background: none; border: 1px solid transparent;
  transition: all 0.15s; user-select: none;
}
.analysis-tab:hover { color: var(--text); border-color: var(--border); }
.analysis-tab.active { color: var(--accent); border-color: var(--accent); background: rgba(99,102,241,0.08); }
.analysis-body { flex: 1; display: flex; flex-direction: column; overflow: hidden; }
#analysisCanvas { width: 100%; flex: 1; min-height: 0; }
.analysis-info {
  flex-shrink: 0; padding: 6px 8px; font-family: 'JetBrains Mono', monospace; font-size: 10px;
  color: var(--text-dim); border-top: 1px solid var(--border); overflow-y: auto; max-height: 80px;
}
.analysis-controls {
  flex-shrink: 0; padding: 4px 10px; border-top: 1px solid var(--border);
  font-family: 'JetBrains Mono', monospace; font-size: 10px; color: var(--text-dim);
  display: none; flex-direction: column; gap: 3px;
}
.analysis-controls.active { display: flex; }
.analysis-ctrl-row { display: flex; align-items: center; gap: 8px; }
.analysis-controls label { white-space: nowrap; user-select: none; }
.analysis-controls input[type="range"] { flex: 1; min-width: 50px; accent-color: var(--accent); height: 12px; }
.analysis-controls input[type="range"]:disabled { opacity: 0.3; }
.analysis-controls .ctrl-val { min-width: 30px; text-align: right; color: var(--text); }
.analysis-controls .ctrl-val.disabled { color: var(--text-dim); opacity: 0.4; }

/* Controls */
.controls {
  display: flex; align-items: center; justify-content: space-between;
  padding: 4px 20px; background: var(--bg-panel); border-top: 1px solid var(--border); min-height: 28px;
}
.nav-group { display: flex; align-items: center; gap: 8px; }
.nav-btn {
  font-family: 'JetBrains Mono', monospace; font-size: 13px;
  width: 28px; height: 22px; display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--border); background: var(--bg-surface); color: var(--text);
  border-radius: 3px; cursor: pointer; transition: all 0.15s;
}
.nav-btn:hover { border-color: var(--accent); color: var(--accent); }
.epoch-info { font-family: 'JetBrains Mono', monospace; font-size: 11px; color: var(--text-dim); min-width: 180px; text-align: center; }
.epoch-info span { color: var(--text); }
.gain-group { display: flex; align-items: center; gap: 8px; font-family: 'JetBrains Mono', monospace; font-size: 11px; color: var(--text-dim); position: relative; }
.gain-group input[type="range"] { width: 100px; accent-color: var(--accent); }
.ctrl-label { font-family: 'JetBrains Mono', monospace; font-size: 11px; color: var(--text-dim); user-select: none; }
.ctrl-label.clickable { cursor: pointer; border-bottom: 1px dotted var(--text-dim); }
.ctrl-label.clickable:hover { color: var(--accent); border-bottom-color: var(--accent); }
.ctrl-help { margin-left: 8px; font-size: 10px; width: 14px; height: 14px; display: inline-flex; align-items: center; justify-content: center; border: 1px dotted var(--text-dim); border-radius: 50%; border-bottom: none; }
.ctrl-help:hover { border-color: var(--accent); }

/* Popover */
.popover {
  display: none; position: absolute; bottom: calc(100% + 8px); background: var(--bg-panel);
  border: 1px solid var(--border); border-radius: 6px; padding: 10px 12px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.25); z-index: 200; white-space: nowrap;
}
.popover.open { display: block; }
.popover-title {
  font-family: 'JetBrains Mono', monospace; font-size: 10px; font-weight: 600;
  color: var(--text); margin-bottom: 8px; letter-spacing: 0.3px;
}
.popover-table { border-collapse: collapse; font-family: 'JetBrains Mono', monospace; font-size: 10px; }
.popover-table th {
  text-align: left; padding: 2px 10px 2px 0; color: var(--text-dim); font-weight: 500;
  border-bottom: 1px solid var(--border);
}
.popover-table td { padding: 2px 10px 2px 0; color: var(--text); }

/* Channel panel */
.channel-panel {
  display: none; position: fixed; top: 0; left: 0; bottom: 0;
  width: var(--ch-panel-width, 200px); background: var(--bg-panel);
  border-right: 1px solid var(--border); z-index: 150; flex-direction: column;
  box-shadow: 4px 0 20px rgba(0,0,0,0.3);
}
.channel-panel.active { display: flex; }
.ch-panel-resize { position: absolute; top: 0; right: 0; bottom: 0; width: 4px; cursor: ew-resize; z-index: 10; }
.ch-panel-resize:hover { background: var(--accent); opacity: 0.3; }
.channel-panel-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 12px; border-bottom: 1px solid var(--border);
  font-family: 'JetBrains Mono', monospace; font-size: 12px; color: var(--accent); font-weight: 600;
}
.channel-panel-body { flex: 1; overflow-y: auto; padding: 6px 0; }
.ch-group-label {
  font-family: 'JetBrains Mono', monospace; font-size: 9px; color: var(--text-dim);
  padding: 6px 12px 2px; text-transform: uppercase; letter-spacing: 0.5px;
}
.ch-group-actions { float: right; font-size: 8px; }
.ch-group-actions span { cursor: pointer; color: var(--accent); opacity: 0.6; margin-left: 6px; }
.ch-group-actions span:hover { opacity: 1; }
.ch-item {
  display: flex; align-items: center; gap: 8px; padding: 3px 12px; cursor: pointer;
  font-family: 'JetBrains Mono', monospace; font-size: 11px; color: var(--text-dim); transition: background 0.1s;
}
.ch-item:hover { background: var(--bg-surface); }
.ch-item.active { color: var(--text); }
.ch-item .ch-dot { width: 8px; height: 8px; border-radius: 2px; border: 1px solid var(--border); flex-shrink: 0; }
.ch-item.active .ch-dot { border-color: transparent; background: rgba(0, 212, 255, 0.08); }

/* Loading */
.loading {
  position: fixed; inset: 0; background: rgba(10, 14, 26, 0.9);
  display: none; align-items: center; justify-content: center;
  z-index: 100; font-family: 'JetBrains Mono', monospace; font-size: 13px; color: var(--accent);
}
.loading.active { display: flex; }
input[type="file"] { display: none; }

/* Command bar */
.cmd-overlay { display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0; z-index: 400; background: rgba(0,0,0,0.3); }
.cmd-overlay.active { display: flex; justify-content: center; padding-top: 80px; }
.cmd-bar {
  width: min(420px, 90vw); background: var(--bg-panel); border: 1px solid var(--border);
  border-radius: 8px; box-shadow: 0 8px 32px rgba(0,0,0,0.5); overflow: hidden; height: fit-content;
}
.cmd-input-wrap { display: flex; align-items: center; padding: 0 12px; border-bottom: 1px solid var(--border); position: relative; }
.cmd-input-wrap::before { content: ':'; font-family: 'JetBrains Mono', monospace; font-size: 14px; color: var(--accent); margin-right: 6px; }
.cmd-input, .cmd-shadow { font-family: 'JetBrains Mono', monospace; font-size: 13px; padding: 10px 0; }
.cmd-input { flex: 1; background: none; border: none; outline: none; color: var(--text); position: relative; z-index: 1; }
.cmd-shadow { position: absolute; left: 26px; color: var(--text-dim); opacity: 0.4; pointer-events: none; white-space: pre; }
.cmd-dropdown { max-height: 240px; overflow-y: auto; padding: 4px 0; }
.cmd-item {
  padding: 6px 12px; cursor: pointer; border-left: 2px solid transparent;
  transition: background 0.1s, border-color 0.1s;
}
.cmd-item:hover, .cmd-item.active { background: var(--bg-surface); border-left-color: var(--accent); }
.cmd-item-row { display: flex; align-items: center; gap: 8px; }
.cmd-name { font-family: 'JetBrains Mono', monospace; font-size: 12px; font-weight: 600; color: var(--text); }
.cmd-cat {
  font-family: 'JetBrains Mono', monospace; font-size: 9px; font-weight: 500;
  color: var(--accent); background: rgba(99,102,241,0.1); padding: 1px 5px;
  border-radius: 3px; text-transform: uppercase; letter-spacing: 0.3px;
}
.cmd-desc { font-family: 'JetBrains Mono', monospace; font-size: 10px; color: var(--text-dim); margin-top: 2px; }
.cmd-match { color: var(--accent); font-weight: 600; }
.cmd-empty {
  padding: 16px 12px; font-family: 'JetBrains Mono', monospace; font-size: 11px;
  color: var(--text-dim); text-align: center;
}

/* Side panel */
.side-panel {
  display: none; position: fixed; top: 0; right: 0; bottom: 0;
  width: var(--side-panel-width, 340px); background: var(--bg-panel);
  border-left: 1px solid var(--border); z-index: 150; flex-direction: column;
  box-shadow: -4px 0 20px rgba(0,0,0,0.3);
}
.side-panel.active { display: flex; }
.side-panel-resize { position: absolute; top: 0; left: 0; bottom: 0; width: 4px; cursor: ew-resize; z-index: 10; }
.side-panel-resize:hover { background: var(--accent); opacity: 0.3; }
.side-panel-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 14px; border-bottom: 1px solid var(--border);
  font-family: 'JetBrains Mono', monospace; font-size: 12px; color: var(--accent); font-weight: 600;
}
.side-panel-close { background: none; border: none; color: var(--text-dim); font-size: 16px; cursor: pointer; padding: 0 4px; }
.side-panel-close:hover { color: var(--text); }
.side-panel-body {
  flex: 1; overflow-y: auto; padding: 10px 14px;
  font-family: 'JetBrains Mono', monospace; font-size: 11px; color: var(--text);
}

/* H5 tree */
.h5-node { margin-left: 14px; }
.h5-group { cursor: pointer; color: var(--accent); padding: 2px 0; }
.h5-group:hover { text-decoration: underline; }
.h5-group::before { content: '▸ '; font-size: 9px; }
.h5-group.open::before { content: '▾ '; }
.h5-dataset { color: var(--text); padding: 2px 0; }
.h5-dataset::before { content: '◇ '; font-size: 9px; color: var(--text-dim); }
.h5-attr { color: var(--text-dim); font-size: 10px; padding: 1px 0 1px 16px; }
.h5-attr::before { content: '@ '; }
.h5-meta { color: var(--text-dim); font-size: 10px; margin-left: 6px; }

/* Recent files */
.recent-item {
  display: flex; align-items: center; justify-content: space-between;
  padding: 6px 10px; margin: 2px 0; border: 1px solid var(--border); border-radius: 4px;
  background: var(--bg-surface); cursor: pointer; font-family: 'JetBrains Mono', monospace;
  font-size: 11px; color: var(--text); transition: border-color 0.15s;
}
.recent-item:hover { border-color: var(--accent); }
.recent-item .ri-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.recent-item .ri-meta { font-size: 9px; color: var(--text-dim); white-space: nowrap; margin-left: 8px; }

/* Config panel */
.config-panel {
  display: none; position: fixed; top: 50px; right: 16px;
  background: var(--bg-panel); border: 1px solid var(--border); border-radius: 8px;
  padding: 16px 20px; font-family: 'JetBrains Mono', monospace; font-size: 12px;
  color: var(--text); z-index: 200; min-width: 220px; box-shadow: 0 4px 20px rgba(0,0,0,0.5);
}
.config-panel.active { display: block; }
.config-panel h3 { margin: 0 0 12px 0; font-size: 13px; color: var(--accent); font-weight: 500; }
.config-section { margin-bottom: 12px; }
.config-section label { display: block; color: var(--text-dim); margin-bottom: 6px; font-size: 11px; text-transform: uppercase; letter-spacing: 0.5px; }

/* Help panel */
.help-panel {
  display: none; position: fixed; bottom: 16px; right: 16px;
  background: var(--bg-panel); border: 1px solid var(--border); border-radius: 8px;
  padding: 16px 20px; font-family: 'JetBrains Mono', monospace; font-size: 11px !important;
  color: var(--text); z-index: 200; min-width: 240px; box-shadow: 0 4px 20px rgba(0,0,0,0.5);
}
.help-panel * { font-size: 11px !important; }
/* Stage mode button */
#stageModeBtn.active { border-color: #fb923c; color: #fb923c; background: rgba(251,146,60,0.1); }

/* Annotation indicator */
.anno-badge {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  font-weight: 600;
  padding: 1px 6px;
  border-radius: 3px;
  margin-left: 4px;
}
.anno-badge.modified { background: rgba(251,146,60,0.2); color: #fb923c; }
.anno-badge.readonly { background: rgba(100,116,139,0.15); color: var(--text-dim); }

.help-panel.active { display: block; }
.help-panel h3 { margin: 0 0 10px 0; font-size: 12px !important; color: var(--accent); font-weight: 500; }
.help-panel table { width: 100%; border-collapse: collapse; }
.help-panel td { padding: 3px 0; vertical-align: top; }
.help-panel td:first-child { color: var(--accent); padding-right: 12px; white-space: nowrap; }
.help-panel td:last-child { color: var(--text-dim); }