/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    overflow: hidden;
    background: #0d1117;
    color: #e6edf3;
}

/* Fullscreen canvas */
#canvas {
    display: block;
    width: 100vw;
    height: 100vh;
    background: linear-gradient(135deg, #0d1117 0%, #161b22 100%);
    cursor: crosshair;
    transition: opacity 0.3s ease;
}

/* UI container for floating panels */
#ui-container {
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 1000;
    pointer-events: none;
}

/* Floating UI panels */
.ui-panel {
    background: rgba(22, 27, 34, 0.95);
    border: 1px solid rgba(48, 54, 61, 0.8);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 16px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.6), 0 0 1px rgba(255, 255, 255, 0.1);
    pointer-events: auto;
    min-width: 300px;
    backdrop-filter: blur(10px);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.ui-panel:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.7), 0 0 1px rgba(255, 255, 255, 0.15);
}

.ui-panel h3 {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 16px;
    color: #e6edf3;
    letter-spacing: -0.3px;
    background: linear-gradient(135deg, #58a6ff 0%, #79c0ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.ui-panel h4 {
    font-size: 14px;
    font-weight: 500;
    margin-top: 16px;
    margin-bottom: 10px;
    color: #8b949e;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-size: 12px;
}

/* Expression input styling */
.expression-input {
    display: flex;
    align-items: center;
    margin-bottom: 12px;
}

.expression-input label {
    min-width: 45px;
    font-size: 15px;
    color: #8b949e;
    font-weight: 500;
}

math-field {
    flex: 1;
    background: rgba(13, 17, 23, 0.6);
    border: 1.5px solid rgba(48, 54, 61, 0.8);
    border-radius: 6px;
    padding: 8px 12px;
    font-size: 15px;
    color: #e6edf3;
    transition: all 0.2s ease;
}

math-field:hover {
    border-color: rgba(88, 166, 255, 0.4);
    background: rgba(13, 17, 23, 0.8);
}

math-field:focus {
    outline: none;
    border-color: #58a6ff;
    box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.15);
    background: rgba(13, 17, 23, 0.9);
}

/* Buttons */
button {
    background: linear-gradient(135deg, rgba(88, 166, 255, 0.15) 0%, rgba(88, 166, 255, 0.25) 100%);
    border: 1.5px solid rgba(88, 166, 255, 0.5);
    border-radius: 6px;
    padding: 10px 18px;
    font-size: 14px;
    font-weight: 500;
    color: #e6edf3;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    overflow: hidden;
}

button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s ease;
}

button:hover::before {
    left: 100%;
}

button:hover {
    background: linear-gradient(135deg, rgba(88, 166, 255, 0.25) 0%, rgba(88, 166, 255, 0.35) 100%);
    border-color: rgba(88, 166, 255, 0.7);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(88, 166, 255, 0.2);
}

button:active {
    transform: translateY(0px);
    box-shadow: 0 2px 6px rgba(88, 166, 255, 0.15);
}

#update-btn {
    width: 100%;
    margin-top: 12px;
    background: linear-gradient(135deg, rgba(88, 166, 255, 0.25) 0%, rgba(88, 166, 255, 0.35) 100%);
    border-color: rgba(88, 166, 255, 0.6);
    font-weight: 600;
}

#update-btn:hover {
    background: linear-gradient(135deg, rgba(88, 166, 255, 0.35) 0%, rgba(88, 166, 255, 0.45) 100%);
}

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

.button-group button {
    flex: 1;
    min-width: 85px;
}

/* Radio buttons */
.radio-group {
    display: flex;
    gap: 20px;
    margin-bottom: 12px;
}

.radio-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: #8b949e;
    cursor: pointer;
    transition: color 0.2s ease;
    padding: 4px 8px;
    border-radius: 4px;
}

.radio-group label:hover {
    color: #e6edf3;
    background: rgba(88, 166, 255, 0.1);
}

.radio-group input[type="radio"] {
    cursor: pointer;
    width: 16px;
    height: 16px;
    accent-color: #58a6ff;
}

/* Sliders */
.slider-group {
    margin-bottom: 16px;
}

.slider-group label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 14px;
    color: #8b949e;
    margin-bottom: 8px;
}

.slider-group label span {
    color: #58a6ff;
    font-weight: 600;
    font-size: 13px;
}

.slider-group input[type="range"] {
    width: 100%;
    height: 6px;
    background: linear-gradient(90deg, rgba(88, 166, 255, 0.2) 0%, rgba(88, 166, 255, 0.4) 100%);
    border-radius: 3px;
    outline: none;
    cursor: pointer;
    transition: background 0.2s ease;
}

.slider-group input[type="range"]:hover {
    background: linear-gradient(90deg, rgba(88, 166, 255, 0.3) 0%, rgba(88, 166, 255, 0.5) 100%);
}

.slider-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: linear-gradient(135deg, #58a6ff 0%, #79c0ff 100%);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(88, 166, 255, 0.4);
    transition: all 0.2s ease;
}

.slider-group input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.15);
    box-shadow: 0 3px 12px rgba(88, 166, 255, 0.6);
}

.slider-group input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: linear-gradient(135deg, #58a6ff 0%, #79c0ff 100%);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 8px rgba(88, 166, 255, 0.4);
    transition: all 0.2s ease;
}

.slider-group input[type="range"]::-moz-range-thumb:hover {
    transform: scale(1.15);
    box-shadow: 0 3px 12px rgba(88, 166, 255, 0.6);
}

/* Error message */
.error-message {
    margin-top: 12px;
    padding: 10px 12px;
    background: rgba(248, 81, 73, 0.15);
    border: 1.5px solid rgba(248, 81, 73, 0.5);
    border-radius: 6px;
    font-size: 13px;
    color: #ff7b72;
    display: none;
    animation: slideIn 0.3s ease;
}

.error-message.visible {
    display: block;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Preset buttons */
.preset-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
    margin-top: 10px;
}

.preset-btn {
    padding: 8px 12px;
    font-size: 12px;
    background: linear-gradient(135deg, rgba(88, 166, 255, 0.1) 0%, rgba(88, 166, 255, 0.2) 100%);
    border: 1.5px solid rgba(88, 166, 255, 0.3);
}

.preset-btn:hover {
    background: linear-gradient(135deg, rgba(88, 166, 255, 0.2) 0%, rgba(88, 166, 255, 0.3) 100%);
    border-color: rgba(88, 166, 255, 0.5);
}

/* Keyboard hints */
.keyboard-hints {
    margin-top: 12px;
    padding: 8px 10px;
    background: rgba(88, 166, 255, 0.08);
    border: 1px solid rgba(88, 166, 255, 0.2);
    border-radius: 4px;
    text-align: center;
}

.keyboard-hints small {
    font-size: 11px;
    color: #8b949e;
    letter-spacing: 0.3px;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    #ui-container {
        top: 10px;
        left: 10px;
        right: 10px;
    }
    
    .ui-panel {
        min-width: auto;
        width: 100%;
    }
}