/* --- Global Styles & Dark Theme --- */
:root {
    --bg-color: #1e293b;
    --text-color: #e2e8f0;
    --primary-color: #3b82f6;
    --border-color: #475569;
    --panel-bg-color: #0f172a;
    --play-color: #22c55e;
    --stop-color: #ef4444;
    --slider-track-color: #334155;
    --step-off-color: #334155;
    --step-playing-color: #475569;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow: hidden; /* Prevent body scrollbars */
}

/* --- App Layout --- */
#app-container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 1rem;
}

#main-content {
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 1200px;
    gap: 1rem;
}

#start-btn {
    font-size: 1.5rem; font-weight: bold; color: white;
    background-color: var(--primary-color);
    border: none; padding: 1rem 2rem; border-radius: 8px;
    cursor: pointer; transition: background-color 0.2s ease-in-out;
}
#start-btn:hover { background-color: #2563eb; }

/* --- Transport & Channel Rack --- */
#transport-controls, #channel-rack {
    background-color: var(--panel-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
}
#transport-controls { display: flex; align-items: center; gap: 2rem; }
#channel-rack { display: flex; flex-direction: column; gap: 0.5rem; }

/* ... (previous transport styles remain the same) ... */

.channel {
    display: flex; justify-content: space-between; align-items: center;
    background-color: var(--bg-color);
    padding: 0.5rem 1rem; border-radius: 6px;
}
.channel-label { font-weight: bold; font-size: 1.1rem; }
.editor-toggle-btn {
    background-color: var(--slider-track-color); color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 0.25rem 0.75rem; border-radius: 4px; cursor: pointer;
}
.editor-toggle-btn:hover { background-color: var(--border-color); }


/* --- START: Windowing System Styles --- */
#desktop {
    position: relative;
    width: 100%;
    height: 50vh; /* Give the desktop some space */
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--panel-bg-color);
    overflow: hidden;
}

.editor-window {
    position: absolute;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.5);
    display: flex;
    flex-direction: column;
    min-width: 300px;
}

.window-header {
    background-color: var(--slider-track-color);
    padding: 0.25rem 0.5rem;
    cursor: move;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top-left-radius: 7px;
    border-top-right-radius: 7px;
}
.window-header span { font-weight: bold; }
.window-controls button {
    background: none; border: none; color: var(--text-color);
    font-size: 1rem; cursor: pointer; width: 24px; height: 24px;
}
.window-controls button:hover { background-color: var(--border-color); border-radius: 4px; }

.window-content {
    padding: 1rem;
    overflow: auto;
}

.editor-window.minimized .window-content {
    display: none;
}
/* --- END: Windowing System Styles --- */


/* --- Editor Content Styles (Drum Sequencer, Piano Roll) --- */
/* These are now nested within a window, so selectors might need adjustment if they were too specific */
.sequencer-editor, .piano-roll-editor { display: flex; }

/* Drum Sequencer */
.track-labels { display: flex; flex-direction: column; gap: 5px; text-align: right; font-weight: bold; font-size: 0.9rem; }
#grid-container { display: grid; grid-template-columns: repeat(16, 1fr); grid-template-rows: repeat(4, 1fr); gap: 5px; flex: 1; }
.step { width: 100%; aspect-ratio: 1 / 1; background-color: var(--step-off-color); border-radius: 4px; cursor: pointer; transition: background-color 0.1s; }
.step:hover, .note-cell:hover { background-color: var(--step-playing-color); }
.step.active { background-color: var(--primary-color); }
.step.playing { box-shadow: 0 0 10px var(--primary-color); }

/* Piano Roll */
#piano-keys { display: flex; flex-direction: column; position: relative; }
.piano-key { display: flex; align-items: center; justify-content: center; font-size: 0.7rem; font-weight: bold; box-sizing: border-box; }
.white-key { background-color: #f8fafc; color: #334155; border: 1px solid #94a3b8; width: 80px; height: 30px; z-index: 1; }
.black-key { background-color: #0f172a; color: #e2e8f0; border: 1px solid #94a3b8; width: 55px; height: 20px; position: absolute; left: 25px; z-index: 2; }
#piano-roll-grid { display: grid; grid-template-columns: repeat(16, 40px); grid-auto-rows: 30px; gap: 1px; background-color: var(--border-color); border: 1px solid var(--border-color); flex-grow: 1; }
.note-cell { background-color: var(--step-off-color); cursor: pointer; transition: background-color 0.1s; }
.note-cell.black-key-row { background-color: #283549; }
.note-cell.active { background-color: #f59e0b; border: 1px solid #f8fafc; }
.note-cell.playing { box-shadow: inset 0 0 5px rgba(255, 255, 255, 0.7); }

/* --- Utility Classes --- */
.hidden { display: none !important; }