body {
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    color: #333;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

.container {
    width: 90%;
    max-width: 500px;
    margin: 20px auto;
    padding: 20px;
}

.card {
    background-color: rgba(255, 255, 255, 0.9);
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.08);
    padding: 30px;
    text-align: center;
}

h1 {
    text-align: center;
    color: #2c3e50;
    margin-bottom: 30px;
}

.upload-container {
    border: 2px dashed #ccc;
    border-radius: 8px;
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: background-color 0.3s ease;
    margin-bottom: 20px;
}

.upload-container:hover {
    background-color: rgba(249, 249, 249, 0.5);
}

.upload-container i {
    font-size: 48px;
    color: #3498db;
    margin-bottom: 10px;
}

.upload-container p {
    margin: 0;
    color: #666;
}

.file-input-container {
    position: relative;
    overflow: hidden;
    display: inline-block;
}

.file-input-container input[type=file] {
    font-size: 100px;
    position: absolute;
    left: 0;
    top: 0;
    opacity: 0;
}

.file-label {
    display: inline-block;
    padding: 8px 20px;
    background: #3498db;
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background 0.3s ease;
}

.file-label:hover {
    background: #2980b9;
}

.upload-btn, .download-btn {
    padding: 10px 20px;
    background: #3498db;
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    transition: background 0.3s ease;
    display: block;
    margin: 20px auto;
}

.upload-btn:hover, .download-btn:hover {
    background: #27ae60;
}

.download-btn:disabled {
    background: #95a5a6;
    cursor: not-allowed;
}

#download-all-btn {
    display: block;
    margin: 20px auto;
}

#progress-container {
    margin-top: 20px;
    background: #e0e0e0;
    border-radius: 5px;
    overflow: hidden;
}

#progress-bar {
    width: 0;
    height: 20px;
    background: #3498db;
    transition: width 0.3s ease;
}

#progress-text {
    color: #fff;
    display: block;
    text-align: center;
    line-height: 20px;
}

#upload-info {
    margin-top: 10px;
    font-size: 14px;
}

.error-message, .success-message {
    padding: 10px;
    border-radius: 5px;
    margin-top: 10px;
    text-align: center;
}

.error-message {
    background-color: #e74c3c;
    color: #fff;
}

.success-message {
    background-color: #2ecc71;
    color: #fff;
}

.copy-btn {
    background: #3498db;
    color: #fff;
    border: none;
    padding: 5px 10px;
    border-radius: 3px;
    cursor: pointer;
    font-size: 14px;
    transition: background 0.3s ease;
}

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

input[type="text"] {
    width: calc(100% - 22px);
    padding: 10px;
    margin-bottom: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
}

#countdown {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 20px;
}

.circular-progress-bar {
    position: relative;
    width: 120px;
    height: 120px;
}

.progress-ring__circle {
    transition: 0.35s stroke-dashoffset;
    transform: rotate(-90deg);
    transform-origin: 50% 50%;
}

#timer {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 24px;
    font-weight: bold;
}

#file-list {
    max-height: 300px;
    overflow-y: auto;
    margin-top: 20px;
    text-align: left;
}

.file-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    padding: 10px;
    background-color: #f8f9fa;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.file-item:hover {
    background-color: #e9ecef;
}

.file-name {
    flex-grow: 1;
    margin-right: 10px;
    word-break: break-all;
}

.file-size {
    font-size: 0.8em;
    color: #6c757d;
    margin-right: 10px;
}

.result {
    margin-top: 20px;
}

.language-switcher {
    position: absolute;
    top: 10px;
    right: 10px;
}

.language-switcher a {
    color: #fff;
    text-decoration: none;
    margin-left: 10px;
    padding: 5px 10px;
    border-radius: 5px;
    background-color: rgba(0, 0, 0, 0.5);
}

.language-switcher a.active {
    background-color: rgba(0, 0, 0, 0.8);
}

#total-size {
    font-weight: bold;
    color: #3498db;
}

#copy-success {
    color: green;
    margin-top: 5px;
    display: none;
}

.language-dropdown {
    position: fixed;
    top: 10px;
    right: 10px;
    z-index: 1000;
}

.language-dropdown select {
    padding: 5px;
    border-radius: 5px;
    border: 1px solid #ccc;
    background-color: white;
    font-size: 14px;
}

/* Modal styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.4);
}

.modal-content {
    background-color: #fefefe;
    margin: 15% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 80%;
    max-width: 500px;
    border-radius: 5px;
    text-align: center;
}

.modal-content p {
    margin-bottom: 20px;
}

.modal-content button {
    padding: 10px 20px;
    background-color: #3498db;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.modal-content button:hover {
    background-color: #2980b9;
}