* {
    box-sizing: border-box;
}

body {
    font-family: 'Web UI Sans', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    background: #f5f7fa;
    padding: 2rem;
    color: #333;
}

.container {
    max-width: 900px;
    margin: auto;
    background: #fff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
}

h1 {
    margin-top: 0;
}

.drop-zone {
    border: 2px dashed #c7c7c7;
    border-radius: 6px;
    padding: 1.5rem;
    text-align: center;
    margin-bottom: 1rem;
    background: #fafafa;
    transition: background 0.2s, border-color 0.2s;
}

.drop-zone.dragover {
    background: #eef2ff;
    border-color: #4f46e5;
}

input[type="file"] {
    font-family: 'Web UI Sans', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    margin-top: 0.5rem;
}

textarea {
    width: 100%;
    min-height: 200px;
    resize: vertical;
    font-family: 'Courier Next', monospace;
    font-size: 0.85rem;
    padding: 1rem;
    margin-top: 1rem;
}

.controls {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 1rem;
}

button {
    font-family: 'Web UI Sans', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 4px;
    background: #4f46e5;
    color: #fff;
    font-size: 1rem;
    cursor: pointer;
}

button:disabled {
    background: #a5b4fc;
    cursor: not-allowed;
}

button:hover:not(:disabled) {
    background: #4338ca;
}

label {
    font-size: 0.9rem;
}

.status {
    margin-top: 0.75rem;
    font-size: 0.9rem;
}

.warning {
    color: #b45309;
}

.success {
    color: #16a34a;
}

.section-title {
    margin-top: 2rem;
    font-size: 1.1rem;
    font-weight: 600;
}