* {
    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;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 600px;
}

.form-wrapper {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

h1 {
    color: #333;
    font-size: 32px;
    margin-bottom: 10px;
    text-align: center;
}

.subtitle {
    color: #666;
    text-align: center;
    margin-bottom: 30px;
    font-size: 16px;
}

.file-input-wrapper {
    margin-bottom: 25px;
}

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

label[for="fileInput"] {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    border: 3px dashed #ddd;
    border-radius: 15px;
    cursor: pointer;
    transition: all 0.3s ease;
    background: #f8f9fa;
}

label[for="fileInput"]:hover {
    border-color: #667eea;
    background: #f0f1ff;
}

label[for="fileInput"].dragover {
    border-color: #667eea;
    background: #e8ebff;
    transform: scale(1.02);
}

label[for="fileInput"] svg {
    color: #667eea;
    margin-bottom: 15px;
}

#fileName {
    color: #333;
    font-size: 16px;
    font-weight: 500;
    margin-bottom: 8px;
}

.file-types {
    color: #999;
    font-size: 13px;
}

label[for="fileInput"].has-file {
    border-color: #28a745;
    background: #f0fff4;
}

label[for="fileInput"].has-file svg {
    color: #28a745;
}

button[type="submit"] {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

button[type="submit"]:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.4);
}

button[type="submit"]:active:not(:disabled) {
    transform: translateY(0);
}

button[type="submit"]:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.loader {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.message {
    margin-top: 20px;
    padding: 15px;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 500;
    text-align: center;
    display: none;
}

.message.success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
    display: block;
}

.message.error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
    display: block;
}

.progress-wrapper {
    margin-top: 20px;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: #e9ecef;
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 8px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    border-radius: 10px;
    transition: width 0.3s ease;
    width: 0%;
}

.progress-text {
    display: block;
    text-align: center;
    color: #666;
    font-size: 13px;
    font-weight: 500;
}

@media (max-width: 640px) {
    .form-wrapper {
        padding: 30px 20px;
    }
    
    h1 {
        font-size: 26px;
    }
    
    label[for="fileInput"] {
        padding: 30px 15px;
    }
}