/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header styles */
.header {
    text-align: center;
    margin-bottom: 40px;
    color: white;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 10px;
}

.logo i {
    font-size: 2.5rem;
    color: #4CAF50;
}

.logo h1 {
    font-size: 2.5rem;
    font-weight: 700;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: 300;
}

/* Main content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Upload card */
.upload-card {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
}

.upload-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 25px 50px rgba(0,0,0,0.15);
}

/* Upload area */
.upload-area {
    border: 3px dashed #e0e0e0;
    border-radius: 15px;
    padding: 60px 20px;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
}

.upload-area:hover {
    border-color: #4CAF50;
    background-color: #f8fff8;
}

.upload-area.dragover {
    border-color: #4CAF50;
    background-color: #e8f5e8;
    transform: scale(1.02);
}

.upload-icon {
    margin-bottom: 20px;
}

.upload-icon i {
    font-size: 4rem;
    color: #4CAF50;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

.upload-area h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: #333;
}

.upload-area p {
    color: #666;
    margin-bottom: 5px;
}

.file-info {
    font-size: 0.9rem;
    color: #999;
    margin-bottom: 20px;
}

.browse-btn {
    background: linear-gradient(45deg, #4CAF50, #45a049);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 25px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.browse-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(76, 175, 80, 0.4);
}

/* File preview */
.file-preview {
    margin-top: 20px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 10px;
    border: 1px solid #e9ecef;
}

.file-info-display {
    display: flex;
    align-items: center;
    gap: 15px;
}

.file-icon i {
    font-size: 2rem;
    color: #4CAF50;
}

.file-details h4 {
    font-size: 1.1rem;
    margin-bottom: 5px;
    color: #333;
}

.file-details p {
    color: #666;
    font-size: 0.9rem;
}

.remove-btn {
    background: #ff4757;
    color: white;
    border: none;
    width: 35px;
    height: 35px;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-left: auto;
}

.remove-btn:hover {
    background: #ff3742;
    transform: scale(1.1);
}

/* Progress container */
.progress-container {
    margin-top: 20px;
    padding: 20px;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 10px;
    border: 1px solid #dee2e6;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.progress-header h4 {
    color: #333;
    font-size: 1.1rem;
}

.progress-percentage {
    font-weight: bold;
    color: #4CAF50;
    font-size: 1.1rem;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: #e0e0e0;
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 10px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #4CAF50, #45a049);
    width: 0%;
    transition: width 0.3s ease;
    border-radius: 4px;
    position: relative;
    overflow: hidden;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background-image: linear-gradient(
        -45deg,
        rgba(255, 255, 255, 0.2) 25%,
        transparent 25%,
        transparent 50%,
        rgba(255, 255, 255, 0.2) 50%,
        rgba(255, 255, 255, 0.2) 75%,
        transparent 75%,
        transparent
    );
    background-size: 50px 50px;
    animation: move 2s linear infinite;
}

@keyframes move {
    0% {
        background-position: 0 0;
    }
    100% {
        background-position: 50px 50px;
    }
}

.progress-status {
    font-size: 0.9rem;
    color: #666;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.progress-status .loading {
    width: 16px;
    height: 16px;
    border: 2px solid #f3f3f3;
    border-top: 2px solid #4CAF50;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* Upload actions */
.upload-actions {
    margin-top: 30px;
    text-align: center;
}

.upload-btn {
    background: linear-gradient(45deg, #2196F3, #1976D2);
    color: white;
    border: none;
    padding: 15px 40px;
    border-radius: 25px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
}

.upload-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(33, 150, 243, 0.4);
}

.upload-btn:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* Results card */
.results-card {
    background: white;
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    border-left: 5px solid #4CAF50;
}

.results-header h3 {
    color: #4CAF50;
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
}

.results-content {
    color: #333;
}

/* Error card */
.error-card {
    background: white;
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    border-left: 5px solid #ff4757;
}

.error-header h3 {
    color: #ff4757;
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
}

.error-content {
    color: #333;
}

/* Footer */
.footer {
    text-align: center;
    margin-top: 40px;
    color: white;
    opacity: 0.8;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .upload-card {
        padding: 20px;
    }
    
    .upload-area {
        padding: 40px 15px;
    }
    
    .logo h1 {
        font-size: 2rem;
    }
    
    .upload-icon i {
        font-size: 3rem;
    }
    
    .file-info-display {
        flex-direction: column;
        text-align: center;
    }
    
    .remove-btn {
        margin-left: 0;
        margin-top: 10px;
    }
}

@media (max-width: 480px) {
    .logo {
        flex-direction: column;
        gap: 10px;
    }
    
    .logo h1 {
        font-size: 1.5rem;
    }
    
    .upload-area {
        padding: 30px 10px;
    }
    
    .upload-btn {
        padding: 12px 30px;
        font-size: 1rem;
    }
}

/* Loading animation */
.loading {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top: 2px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-right: 8px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Success animation */
.success-animation {
    animation: successPulse 0.6s ease-in-out;
}

@keyframes successPulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}