/* Lissajous Curves Simulator - Dark Theme with Neon Glow */

:root {
    --bg-primary: #0a0e1a;
    --bg-secondary: #121826;
    --bg-tertiary: #1a2234;
    --text-primary: #e8eaed;
    --text-secondary: #9aa0a6;
    --accent-cyan: #00ffc8;
    --accent-blue: #4d9fff;
    --accent-purple: #b967ff;
    --accent-pink: #ff6b9d;
    --border-color: #2a3447;
    --glow-cyan: 0 0 20px rgba(0, 255, 200, 0.3);
    --glow-blue: 0 0 20px rgba(77, 159, 255, 0.3);
}

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

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

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

/* Header */
header {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px;
    background: var(--bg-secondary);
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

header h1 {
    font-size: 2.5rem;
    font-weight: 300;
    color: var(--accent-cyan);
    text-shadow: var(--glow-cyan);
    margin-bottom: 10px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 300;
    letter-spacing: 1px;
}

/* Main Content */
.main-content {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 30px;
    align-items: start;
}

/* Canvas Container */
.canvas-container {
    position: relative;
    background: var(--bg-secondary);
    border-radius: 10px;
    padding: 20px;
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

#lissajousCanvas {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 5px;
    background: var(--bg-primary);
    cursor: crosshair;
}

#lissajousCanvas.grabbing {
    cursor: grabbing;
}

.canvas-overlay {
    position: absolute;
    top: 30px;
    left: 30px;
    pointer-events: none;
}

.coordinates {
    display: flex;
    gap: 20px;
    background: rgba(10, 14, 26, 0.8);
    padding: 10px 15px;
    border-radius: 5px;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    color: var(--accent-cyan);
    border: 1px solid var(--border-color);
}

/* Controls */
.controls {
    display: flex;
    flex-direction: column;
    gap: 20px;
    max-height: calc(100vh - 200px);
    overflow-y: auto;
    padding-right: 10px;
}

.controls::-webkit-scrollbar {
    width: 8px;
}

.controls::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

.controls::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

.controls::-webkit-scrollbar-thumb:hover {
    background: var(--accent-blue);
}

.control-group {
    background: var(--bg-secondary);
    padding: 20px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.control-group h3 {
    color: var(--accent-cyan);
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.control-row {
    margin-bottom: 15px;
}

.control-row:last-child {
    margin-bottom: 0;
}

.control-row label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.label-text {
    flex: 1;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.value-display {
    min-width: 60px;
    text-align: right;
    font-family: 'Courier New', monospace;
    color: var(--accent-cyan);
    font-weight: 600;
}

/* Sliders */
input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    outline: none;
    margin: 10px 0;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--accent-cyan);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--glow-cyan);
    transition: all 0.2s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 0 30px rgba(0, 255, 200, 0.5);
}

input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--accent-cyan);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--glow-cyan);
    transition: all 0.2s ease;
}

input[type="range"]::-moz-range-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 0 30px rgba(0, 255, 200, 0.5);
}

/* Checkbox */
.checkbox-row input[type="checkbox"] {
    width: auto;
    margin-right: 10px;
    accent-color: var(--accent-cyan);
}

.checkbox-row label {
    cursor: pointer;
}

/* Buttons */
.button-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.mode-btn,
.action-btn,
.preset-btn {
    padding: 10px 15px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.2s ease;
    flex: 1;
    min-width: 80px;
}

.mode-btn:hover,
.action-btn:hover,
.preset-btn:hover {
    background: var(--accent-blue);
    border-color: var(--accent-blue);
    box-shadow: var(--glow-blue);
    transform: translateY(-2px);
}

.mode-btn.active {
    background: var(--accent-cyan);
    border-color: var(--accent-cyan);
    color: var(--bg-primary);
    box-shadow: var(--glow-cyan);
}

.action-btn:disabled,
.preset-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.action-btn:disabled:hover,
.preset-btn:disabled:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-color);
    box-shadow: none;
    transform: none;
}

/* Preset Grid */
.preset-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

/* Curve List */
.curve-list {
    max-height: 200px;
    overflow-y: auto;
    margin-top: 15px;
}

.empty-message {
    text-align: center;
    color: var(--text-secondary);
    font-style: italic;
    padding: 20px;
}

.curve-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    margin-bottom: 8px;
    background: var(--bg-tertiary);
    border-radius: 5px;
    border-left-width: 3px;
    border-left-style: solid;
}

.remove-btn {
    background: transparent;
    border: none;
    color: var(--accent-pink);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0 5px;
    transition: transform 0.2s ease;
}

.remove-btn:hover {
    transform: scale(1.2);
}

/* Info Panel */
.info-panel {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
}

.info-content {
    font-size: 0.9rem;
}

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

.info-content strong {
    color: var(--accent-cyan);
}

.equation {
    background: var(--bg-tertiary);
    padding: 15px;
    border-radius: 5px;
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    margin: 10px 0;
    border: 1px solid var(--border-color);
}

.equation span {
    color: var(--accent-cyan);
}

/* Footer */
footer {
    text-align: center;
    margin-top: 30px;
    padding: 20px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 1fr;
    }

    .controls {
        max-height: none;
    }
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 0.9rem;
    }

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

    .button-group {
        flex-direction: column;
    }

    .mode-btn,
    .action-btn,
    .preset-btn {
        flex: none;
        width: 100%;
    }
}

/* Animations */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

.pulse {
    animation: pulse 2s ease-in-out infinite;
}

/* Loading State */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 200px;
    color: var(--text-secondary);
}

/* Tooltip */
.tooltip {
    position: relative;
    display: inline-block;
    cursor: help;
}

.tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    padding: 8px 12px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    font-size: 0.8rem;
    border-radius: 5px;
    border: 1px solid var(--border-color);
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
    margin-bottom: 10px;
}

.tooltip:hover::after {
    opacity: 1;
}

/* Focus States */
input[type="range"]:focus,
button:focus {
    outline: 2px solid var(--accent-cyan);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .controls {
        display: none;
    }

    .main-content {
        grid-template-columns: 1fr;
    }

    header {
        page-break-after: avoid;
    }
}