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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    padding: 40px;
}

header {
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 3px solid #667eea;
}

header h1 {
    font-size: 2.5em;
    color: #667eea;
    margin-bottom: 10px;
}

header p {
    color: #666;
    font-size: 1.1em;
}

.message {
    padding: 15px 20px;
    border-radius: 10px;
    margin-bottom: 30px;
    font-weight: 500;
    animation: slideIn 0.3s ease;
}

.message.success {
    background: #d4edda;
    color: #155724;
    border: 2px solid #c3e6cb;
}

.message.error {
    background: #f8d7da;
    color: #721c24;
    border: 2px solid #f5c6cb;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.upload-section {
    background: #f8f9fa;
    padding: 30px;
    border-radius: 15px;
    margin-bottom: 40px;
}

.upload-section h2 {
    color: #333;
    margin-bottom: 20px;
    font-size: 1.8em;
}

#uploadForm {
    display: flex;
    gap: 15px;
    align-items: center;
    flex-wrap: wrap;
}

.file-input-wrapper {
    flex: 1;
    min-width: 250px;
}

.file-input-wrapper input[type="file"] {
    display: none;
}

.file-label {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 15px 25px;
    background: white;
    border: 2px dashed #667eea;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1em;
}

.file-label:hover {
    background: #667eea;
    color: white;
    border-style: solid;
}

.file-icon {
    font-size: 1.5em;
}

.btn-upload {
    padding: 15px 40px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1.1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-upload:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.btn-upload:active {
    transform: translateY(0);
}

.files-section h2 {
    color: #333;
    margin-bottom: 25px;
    font-size: 1.8em;
}

.no-files {
    text-align: center;
    color: #999;
    font-size: 1.2em;
    padding: 40px;
}

.files-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 20px;
}

.file-card {
    background: #f8f9fa;
    border-radius: 15px;
    padding: 25px;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.file-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    border-color: #667eea;
}

.file-icon-large {
    font-size: 3em;
    text-align: center;
    margin-bottom: 15px;
}

.file-info h3 {
    color: #333;
    font-size: 1.1em;
    margin-bottom: 10px;
    word-break: break-all;
}

.file-meta {
    color: #666;
    font-size: 0.9em;
    display: flex;
    flex-direction: column;
    gap: 5px;
    margin-bottom: 20px;
}

.file-actions {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.btn-download,
.btn-copy,
.btn-delete {
    padding: 12px 20px;
    border-radius: 8px;
    text-decoration: none;
    text-align: center;
    font-weight: 600;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    font-size: 0.95em;
    display: block;
}

.btn-download {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-download:hover {
    transform: translateX(5px);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-copy {
    background: #28a745;
    color: white;
}

.btn-copy:hover {
    background: #218838;
    transform: translateX(5px);
}

.btn-delete {
    background: #dc3545;
    color: white;
}

.btn-delete:hover {
    background: #c82333;
    transform: translateX(5px);
}

@media (max-width: 768px) {
    .container {
        padding: 20px;
    }

    header h1 {
        font-size: 2em;
    }

    .files-grid {
        grid-template-columns: 1fr;
    }

    #uploadForm {
        flex-direction: column;
    }

    .file-input-wrapper {
        width: 100%;
    }

    .btn-upload {
        width: 100%;
    }
}