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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f4f4f4;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background-color: white;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    min-height: 100vh;
}

header {
    padding: 20px 0;
    border-bottom: 1px solid #eee;
    margin-bottom: 20px;
}

h1 {
    color: #2c3e50;
}

.file-list {
    list-style: none;
}

.file-item {
    padding: 12px 15px;
    border-bottom: 1px solid #eee;
    display: flex;
    align-items: center;
    transition: background-color 0.2s;
}

.file-item:hover {
    background-color: #f9f9f9;
    cursor: pointer;
}

.file-icon {
    margin-right: 10px;
    font-size: 1.2em;
    color: #7f8c8d;
}

.file-name {
    flex-grow: 1;
}

.file-size {
    color: #7f8c8d;
    font-size: 0.9em;
}

.loading {
    text-align: center;
    padding: 20px;
    color: #7f8c8d;
}

footer {
    margin-top: 30px;
    text-align: center;
    padding: 20px 0;
    border-top: 1px solid #eee;
    color: #7f8c8d;
    font-size: 0.9em;
}