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

:root {
    --primary-color: #2d5fff;
    --secondary-color: #ff2d5f;
    --background-color: #121212;
    --surface-color: #1e1e1e;
    --text-color: #ffffff;
    --inactive-color: #333333;
    --active-step-color: #d9b543;
    --current-step-color: #5f2dff;
    --track-height: 60px;
    --step-size: 40px;
    --step-gap: 2px;
    --track-name-width: 120px;
    --beat-marker-color: rgba(255, 255, 255, 0.15);
}

body {
    font-family: 'Arial', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 20px;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.controls {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 20px;
    width: 100%;
    padding: 15px;
    background-color: var(--surface-color);
    border-radius: 5px;
}

.control-button {
    background-color: var(--primary-color);
    color: var(--text-color);
    border: none;
    border-radius: 5px;
    padding: 10px 20px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s;
}

.control-button:hover {
    background-color: var(--secondary-color);
}

.tempo-container, .master-volume-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
}

#tempo-display {
    font-size: 1.2rem;
    font-weight: bold;
}

.sequencer-container {
    width: 100%;
    overflow-x: auto;
    background-color: var(--surface-color);
    border-radius: 5px;
    padding: 15px;
    margin-bottom: 20px;
}

.tracks {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.track {
    display: flex;
    height: var(--track-height);
    background-color: rgba(0, 0, 0, 0.3);
    border-radius: 3px;
    overflow: hidden;
    cursor: pointer;
}

.track.selected {
    outline: 2px solid var(--active-step-color);
}

.track-name {
    display: flex;
    align-items: center;
    justify-content: center;
    width: var(--track-name-width);
    min-width: var(--track-name-width);
    background-color: #000;
    color: #fff;
    font-weight: bold;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 10px;
}

.track-steps {
    display: flex;
    flex-grow: 1;
    padding: 10px;
    align-items: center;
}

/* Track controls section that appears below */
.track-controls-panel {
    display: none;
    background-color: #252525;
    border-radius: 5px;
    padding: 20px;
    margin-bottom: 20px;
}

.track-controls-panel.visible {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}

.control-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.control-group label {
    font-size: 0.9rem;
    text-transform: uppercase;
    opacity: 0.8;
}

/* Step buttons container */
.step-buttons-container {
    display: flex;
    gap: var(--step-gap);
    align-items: center;
    height: 100%;
}

.step-container {
    width: var(--step-size);
    height: var(--step-size);
    position: relative;
}

/* Marker for beat divisions */
.step-container.beat-start::before {
    content: '';
    position: absolute;
    left: -1px;
    top: 0;
    bottom: 0;
    width: 1px;
    background-color: var(--beat-marker-color);
    z-index: 1;
}

/* Beat steps will be styled to look like the image */
.step {
    width: var(--step-size);
    height: var(--step-size);
    border-radius: 3px;
    background-color: var(--inactive-color);
    cursor: pointer;
    transition: background-color 0.15s;
    box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.1), 
                inset 0 -1px 1px rgba(0, 0, 0, 0.3);
}

.step.active {
    background-color: var(--active-step-color);
    box-shadow: 0 0 5px rgba(217, 181, 67, 0.5);
}

.step.current {
    border: 2px solid var(--current-step-color);
}

.help-section {
    background-color: var(--surface-color);
    padding: 20px;
    border-radius: 5px;
    margin-bottom: 30px;
}

.help-section h2 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    background-color: var(--surface-color);
    border-radius: 5px;
}

.presets, .save-load, .kit-selector {
    display: flex;
    gap: 10px;
    align-items: center;
}

.kit-selector {
    margin-right: 20px;
}

select, button {
    padding: 8px 15px;
    background-color: var(--primary-color);
    color: var(--text-color);
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

/* Loading indicator styling */
#loading-indicator {
    border: 1px solid rgba(0, 0, 0, 0.3);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
}

/* Responsive Design */
@media (max-width: 768px) {
    .controls {
        flex-direction: column;
    }
    
    .track-controls-panel {
        flex-direction: column;
    }
    
    footer {
        flex-direction: column;
        gap: 15px;
    }
}