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

:root {
    --bg-primary: #0a0e27;
    --bg-secondary: #1a1f3a;
    --bg-tertiary: #252b4a;
    --text-primary: #e0e6ed;
    --text-secondary: #a0aab5;
    --accent-primary: #00d4ff;
    --accent-secondary: #7b68ee;
    --accent-tertiary: #ff6b9d;
    --border-color: #2d3450;
    --success-color: #00ff88;
    --warning-color: #ffaa00;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    padding: 30px 0;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 30px;
}

header h1 {
    font-size: 2.5rem;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
}

.subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.visualization-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

.panel.primary-panel {
    grid-column: span 2;
}

.panel h2 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--accent-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

canvas {
    width: 100%;
    height: 400px;
    background: var(--bg-tertiary);
    border-radius: 8px;
    display: block;
}

.panel-controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-top: 15px;
    padding: 15px;
    background: var(--bg-tertiary);
    border-radius: 8px;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.control-group label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.control-group input[type="range"] {
    width: 100%;
    height: 6px;
    background: var(--bg-primary);
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
}

.control-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    background: var(--accent-primary);
    border-radius: 50%;
    cursor: pointer;
    transition: transform 0.2s;
}

.control-group input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.control-group input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: var(--accent-primary);
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

.control-group span {
    font-size: 0.85rem;
    color: var(--accent-primary);
    font-weight: 600;
}

.control-group select {
    padding: 8px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.9rem;
    cursor: pointer;
}

.control-group input[type="checkbox"] {
    width: auto;
    height: 20px;
    cursor: pointer;
}

.stats {
    margin-top: 10px;
    padding: 10px;
    background: var(--bg-primary);
    border-radius: 6px;
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.stats span:last-child {
    color: var(--accent-primary);
    font-weight: 600;
    margin-left: 5px;
}

.controls-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.control-panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
}

.control-panel h3 {
    font-size: 1.1rem;
    margin-bottom: 15px;
    color: var(--accent-primary);
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.preset-buttons,
.control-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 10px;
    margin-bottom: 15px;
}

.preset-btn,
button {
    padding: 10px 15px;
    background: linear-gradient(135deg, var(--accent-secondary), var(--accent-primary));
    border: none;
    border-radius: 8px;
    color: white;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.preset-btn:hover,
button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 212, 255, 0.4);
}

.preset-btn:active,
button:active {
    transform: translateY(0);
}

#pauseBtn {
    background: linear-gradient(135deg, var(--warning-color), #ff8800);
}

#resetBtn,
#clearBtn {
    background: linear-gradient(135deg, var(--accent-tertiary), #ff4777);
}

.metrics {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.metric {
    display: flex;
    justify-content: space-between;
    padding: 8px 12px;
    background: var(--bg-tertiary);
    border-radius: 6px;
    font-size: 0.85rem;
}

.metric span:first-child {
    color: var(--text-secondary);
}

.metric span:last-child {
    color: var(--accent-primary);
    font-weight: 600;
}

.education-section {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 30px;
    margin-top: 30px;
}

.education-content h2 {
    font-size: 1.8rem;
    color: var(--accent-primary);
    margin-bottom: 20px;
}

.education-content h3 {
    font-size: 1.3rem;
    color: var(--accent-secondary);
    margin: 25px 0 15px 0;
}

.equation-box {
    background: var(--bg-tertiary);
    padding: 20px;
    border-radius: 10px;
    margin: 20px 0;
    border-left: 4px solid var(--accent-primary);
}

.equation-box p {
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.equation {
    font-family: 'Times New Roman', serif;
    font-size: 1.4rem;
    color: var(--accent-primary);
    text-align: center;
    padding: 15px;
    background: var(--bg-primary);
    border-radius: 8px;
}

.education-content ul,
.education-content ol {
    margin-left: 25px;
    margin-bottom: 15px;
}

.education-content li {
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.education-content p {
    color: var(--text-secondary);
    margin-bottom: 15px;
    line-height: 1.8;
}

footer {
    text-align: center;
    padding: 30px 0;
    margin-top: 40px;
    border-top: 2px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 1200px) {
    .panel.primary-panel {
        grid-column: span 1;
    }

    .visualization-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    header h1 {
        font-size: 1.8rem;
    }

    .subtitle {
        font-size: 0.9rem;
    }

    canvas {
        height: 300px;
    }

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

    .preset-buttons,
    .control-buttons {
        grid-template-columns: 1fr;
    }

    .metrics {
        grid-template-columns: 1fr;
    }

    .education-content h2 {
        font-size: 1.4rem;
    }

    .education-content h3 {
        font-size: 1.1rem;
    }

    .equation {
        font-size: 1.1rem;
    }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-secondary);
}