.app {
    padding: 20px;
    font-family: system-ui, -apple-system, sans-serif;
}

/* Controls */
.controls {
    margin-bottom: 20px;
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.control-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.control-group input {
    padding: 4px 8px;
    width: 80px;
    background: transparent;
    border: 1px solid #666;
    border-radius: 4px;
    color: white;
}

.control-group input::placeholder {
    color: #666;
}

.clear-btn {
    padding: 2px 6px;
    border-radius: 4px;
    border: 1px solid #666;
    background: transparent;
    color: #666;
    cursor: pointer;
}

.clear-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Histogram */
.histogram-empty {
    color: white;
    font-style: italic;
    padding: 20px 0;
}

.histogram-stats {
    margin-bottom: 16px;
    color: white;
}

.histogram-scroll-container {
    overflow-x: auto;
    margin-bottom: 40px;
    background: rgba(0, 0, 0, 0.1);
    padding: 10px;
    border-radius: 4px;
}

.histogram-content {
    display: flex;
    align-items: flex-end;
    height: 240px;  /* Increased to accommodate labels */
    gap: 2px;
}

.histogram-column {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 30px;
    position: relative;
}

.bar {
    width: 100%;
    background: #2563eb;
    transition: background-color 0.2s ease;
    border-radius: 2px 2px 0 0;
    margin-bottom: 40px;  /* Space for label */
}

.bar.empty {
    background: rgba(37, 99, 235, 0.2);
}

.histogram-column:hover .bar {
    background: #22c55e;
}

.histogram-column:hover .bar.empty {
    background: rgba(34, 197, 94, 0.2);
}

.count-label {
    position: absolute;
    top: -24px;
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 12px;
    opacity: 0;
    transform: translateY(4px);
    transition: all 0.2s ease;
    pointer-events: none;
}

.histogram-column:hover .count-label {
    opacity: 1;
    transform: translateY(0);
}

.x-label {
    color: white;
    font-size: 11px;
    transform: rotate(-45deg);
    transform-origin: left top;
    white-space: nowrap;
    position: absolute;
    bottom: 10px;
    left: -8px;  /* Align to left edge of column */
}

.histogram-final-label {
    min-width: 30px;
    position: relative;
}

.histogram-final-label .x-label {
    left: -8px;  /* Align to left edge of final label div */
}