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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    background: white;
    border-radius: 20px;
    padding: 40px;
    max-width: 500px;
    width: 100%;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 30px;
    font-size: 32px;
}

.drop-zone {
    border: 3px dashed #667eea;
    border-radius: 12px;
    padding: 60px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    background: #f8f9ff;
}

.drop-zone:hover, .drop-zone.active {
    border-color: #764ba2;
    background: #f0f2ff;
}

.drop-zone p {
    color: #667eea;
    font-size: 16px;
}

.controls {
    margin-top: 20px;
    text-align: center;
}

button {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 15px 40px;
    border-radius: 25px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s;
}

button:hover {
    transform: translateY(-2px);
}

button:active {
    transform: translateY(0);
}

.progress {
    margin-top: 20px;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: #e0e0e0;
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    width: 0%;
    transition: width 0.3s;
}

#progressText {
    text-align: center;
    margin-top: 10px;
    color: #667eea;
    font-weight: 600;
}

.result {
    margin-top: 20px;
    text-align: center;
}

.result p {
    color: #4caf50;
    font-size: 20px;
    margin-bottom: 15px;
    font-weight: 600;
}

.file-list {
    margin-top: 20px;
    max-height: 200px;
    overflow-y: auto;
}

.file-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px;
    background: #f8f9ff;
    border-radius: 8px;
    margin-bottom: 8px;
}

.file-item span {
    color: #333;
    font-size: 14px;
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-item .status {
    margin-left: 10px;
    font-size: 12px;
    color: #667eea;
}

.hidden {
    display: none;
}