:root {
    --primary-bg-color: #f0f0f0;
    --secondary-bg-color: #cccccc;
    --primary-text-color: #333;
    --button-color: #333;
    --button-hover-color: #555;
    --button-active-color: #111;
    --bar-color: #4A90E2;
    --bar-hover-color: #357ABD;
    --card-bg: #ffffff;
    --card-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    --primary-bg-color: #1a1a1a;
    --secondary-bg-color: #2d2d2d;
    --primary-text-color: #ffffff;
    --card-bg: #333333;
    --card-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

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

body {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 10px;
    background: linear-gradient(to bottom right, var(--primary-bg-color), var(--secondary-bg-color));
    font-family: 'Roboto', sans-serif;
    color: var(--primary-text-color);
    transition: background-color 0.3s ease;
    min-height: 100vh;
    margin: 0;
    overflow-y: hidden;
}

h1 {
    margin: 5px 0;
}

#container {
    display: flex;
    align-items: flex-end;
    justify-content: center;
    width: 100%;
    max-width: 1250px;
    height: 40vh;
    gap: 4px;
    margin: 10px 0;
    padding: 10px;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.bar {
    width: 12px;
    background-color: var(--bar-color);
    margin: 0.1px;
    border-radius: 6px;
    transition: all 0.3s ease;
    will-change: background-color, height;
}

.bar:hover {
    background-color: var(--bar-hover-color);
}

.button-container {
    text-align: center;
    margin: 10px 0;
}

button, select {
    color: white;
    background-color: var(--button-color);
    border: none;
    padding: 12px 24px;
    font-size: 1rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    will-change: transform, background-color;
}

button:hover, select:hover {
    background-color: var(--button-hover-color);
    transform: translateY(-3px);
}

button:active {
    background-color: var(--button-active-color);
    transform: translateY(0);
}

button:focus, select:focus {
    outline: 2px solid #555;
    outline-offset: 2px;
}

button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.loading {
    position: relative;
    pointer-events: none;
}

.loading::after {
    content: "";
    position: absolute;
    width: 16px;
    height: 16px;
    border: 2px solid #fff;
    border-radius: 50%;
    border-top-color: transparent;
    animation: spin 1s linear infinite;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
}

@keyframes spin {
    to { transform: translateY(-50%) rotate(360deg); }
}

.slider-container {
    margin: 10px 0;
    width: 100%;
    max-width: 400px;
}

.slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 10px;
    border-radius: 5px;
    background: #d3d3d3;
    outline: none;
    opacity: 0.7;
    transition: opacity .2s;
}

.slider:hover {
    opacity: 1;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--button-color);
    cursor: pointer;
    transition: transform 0.2s;
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.controls-panel {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 10px;
    width: 100%;
    max-width: 1250px;
    margin: 10px auto;
}

.algorithm-info-card {
    background: var(--card-bg);
    padding: 10px;
    border-radius: 10px;
    box-shadow: var(--card-shadow);
}

.complexity-info {
    margin: 8px 0;
    padding: 8px;
    background: rgba(0, 0, 0, 0.05);
    border-radius: 5px;
}

.visualization-controls {
    background: var(--card-bg);
    padding: 10px;
    border-radius: 10px;
    box-shadow: var(--card-shadow);
}

.playback-controls {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 10px;
    margin-top: 10px;
}

.playback-controls button {
    min-width: 80px;
    padding: 10px;
}

.stats-panel {
    grid-column: 1 / -1;
    background: var(--card-bg);
    padding: 10px;
    border-radius: 10px;
    box-shadow: var(--card-shadow);
    display: flex;
    justify-content: space-around;
}

.theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
}

@media (max-width: 1024px) {
    #container {
        max-width: 95%;
        height: 45vh;
    }
    
    .controls-panel {
        grid-template-columns: 1fr 2fr;
        max-width: 95%;
    }
}

@media (max-width: 768px) {
    body {
        padding: 10px;
        overflow-y: auto;
    }

    .controls-panel {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    #container {
        height: 40vh;
        padding: 8px;
    }

    .playback-controls {
        grid-template-columns: repeat(3, 1fr);
    }

    .stats-panel {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }

    .theme-toggle {
        position: fixed;
        top: auto;
        bottom: 20px;
        right: 20px;
        z-index: 1000;
    }

    .theme-toggle button {
        width: 40px;
        height: 40px;
        padding: 8px;
        border-radius: 50%;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    }
}

@media (max-width: 480px) {
    #container {
        height: 35vh;
        gap: 1px;
    }

    .bar {
        width: 6px;
    }

    .algorithm-info-card,
    .visualization-controls {
        padding: 8px;
    }

    button, select {
        padding: 8px 16px;
        font-size: 0.9rem;
    }
}