:root {
    --bg-color: #1a1a1a;
    --panel-bg-color: #2a2a2a;
    --text-color: #f0f0f0;
    --primary-color: #31A9FF;
    --border-color: #444;
    --input-bg-color: #333;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 2rem;
    font-size: 16px;
}

#main-container {
    max-width: 1600px;
    margin: 0 auto;
}

h1 {
    text-align: center;
    color: var(--primary-color);
    font-weight: 700;
    font-size: 2.5rem;
    margin-bottom: 2rem;
}

#generator-body {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
}

#controls-panel {
    background-color: var(--panel-bg-color);
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    width: 400px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

#canvas-container {
    flex-grow: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--panel-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
}

#floor-sign-canvas {
    width: 100%;
    max-width: 600px;
    height: auto;
    border-radius: 4px;
}

h2, h3 {
    color: var(--text-color);
    font-weight: 500;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
    margin-top: 0;
}

.control-group {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1rem;
}

.control-group label {
    font-weight: 400;
}

input[type="text"], select {
    background-color: var(--input-bg-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.5rem;
    width: 100%;
    box-sizing: border-box;
}

input[type="color"] {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 4px;
    background-color: transparent;
    cursor: pointer;
}

button, .action-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    padding: 0.75rem 1rem;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.3s ease;
    width: 100%;
}

button:hover, .action-btn:hover {
    background-color: #0099FF;
}

button#example-btn, button#download-btn, button#save-preset-btn, button#load-preset-btn {
    background-color: #555;
}

button#example-btn:hover, button#download-btn:hover, button#save-preset-btn:hover, button#load-preset-btn:hover {
    background-color: #666;
}

hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 0.5rem 0;
}

#font-picker-container {
    position: relative;
    width: 100%;
}

#font-list {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--input-bg-color);
    border: 1px solid var(--border-color);
    border-top: none;
    border-radius: 0 0 4px 4px;
    max-height: 200px;
    overflow-y: auto;
    z-index: 10;
}

#font-list .font-item {
    padding: 0.5rem;
    cursor: pointer;
}

#font-list .font-item:hover {
    background-color: var(--primary-color);
}

@media (max-width: 900px) {
    #generator-body {
        flex-direction: column;
    }
    #controls-panel {
        width: 100%;
        box-sizing: border-box;
    }
}

#loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    display: none; /* Hidden by default */
    justify-content: center;
    align-items: center;
    z-index: 1000;
    flex-direction: column;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 6px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}

#loading-text {
    color: var(--text-color);
    font-size: 1.2rem;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}