:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --background-color: #f5f6fa;
    --border-color: #dcdde1;
    --text-color: #2d3436;
    --grid-color: #f1f2f6;
    --overlay-bg: rgba(0, 0, 0, 0.7);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 1rem auto;
    padding: 0 1rem;
    position: relative;
}

header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.header-controls {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    align-items: center;
}

h1 {
    color: var(--primary-color);
    font-size: 1.75rem;
}

.status {
    font-size: 0.9rem;
    color: var(--primary-color);
}

/* Button Styles */
.control-btn {
    background-color: var(--secondary-color);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background-color 0.2s;
}

.control-btn:hover {
    background-color: #2980b9;
}

.control-btn.secondary {
    background-color: #95a5a6;
}

.control-btn.secondary:hover {
    background-color: #7f8c8d;
}

.control-btn.danger {
    background-color: #e74c3c;
}

.control-btn.danger:hover {
    background-color: #c0392b;
}

.generate-btn {
    background-color: var(--secondary-color);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background-color 0.2s;
}

.generate-btn:hover {
    background-color: #2980b9;
}

/* Drop Zone Styles */
.drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    text-align: center;
    margin-bottom: 2rem;
    background: white;
    transition: all 0.3s ease;
    cursor: pointer;
}

.drop-zone.drag-over {
    border-color: var(--secondary-color);
    background-color: rgba(52, 152, 219, 0.1);
}

.drop-zone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.drop-zone p {
    margin: 0;
    color: var(--text-color);
}

.drop-zone input[type="file"] {
    display: none;
}

@media (max-width: 768px) {
    .container {
        padding: 0 0.5rem;
    }

    header {
        flex-direction: column;
        align-items: stretch;
    }

    .header-controls {
        flex-wrap: wrap;
    }
}