body { 
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; 
    display: flex; 
    justify-content: center; 
    align-items: center; 
    height: 100vh; 
    background: #eceff1; 
    margin: 0; 
}

.card { 
    background: white; 
    padding: 2.5rem; 
    border-radius: 12px; 
    box-shadow: 0 10px 25px rgba(0,0,0,0.1); 
    text-align: center; 
    max-width: 450px; 
    width: 90%; 
}

h1 { 
    color: #2c3e50; 
    margin-bottom: 10px; 
}

p { 
    color: #7f8c8d; 
    margin-bottom: 25px; 
    line-height: 1.5; 
}

.upload-area { 
    border: 2px dashed #3498db; 
    padding: 20px; 
    border-radius: 8px; 
    background: #f8fbff; 
    margin-bottom: 20px; 
}

button { 
    background: #27ae60; 
    color: white; 
    border: none; 
    padding: 12px 25px; 
    border-radius: 6px; 
    cursor: pointer; 
    font-size: 1rem; 
    font-weight: 600; 
    transition: background 0.3s; 
}

button:hover { 
    background: #219150; 
}

button:disabled { 
    background: #bdc3c7; 
    cursor: not-allowed; 
}

#status { 
    margin-top: 20px; 
    font-weight: 500; 
}

.file-list {
    margin-top: 20px;
    text-align: left;
    max-height: 300px;
    overflow-y: auto;
    border-top: 1px solid #eee;
    padding-top: 10px;
}

.file-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: #f9f9f9;
    padding: 8px 12px;
    margin-bottom: 5px;
    border-radius: 4px;
    font-size: 0.85rem;
    color: #333;
}

.download-link {
    background: #3498db;
    color: white;
    text-decoration: none;
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: bold;
}

.download-link:hover {
    background: #2980b9;
}

.download-all-btn {
    background: #e67e22;
    color: white;
    text-decoration: none;
    padding: 10px 15px;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: bold;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: background 0.3s;
}

.download-all-btn:hover {
    background: #d35400;
}

.zip-container {
    margin-bottom: 15px;
    padding-bottom: 15px;
    border-bottom: 2px solid #eee;
    display: flex;
    justify-content: center;
}