/* Reset y configuración base */
* {
    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: 1200px;
    margin: 0 auto;
    padding: 20px;
}

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

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.header h1 i {
    margin-right: 15px;
    color: #ffd700;
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    font-weight: 300;
}

/* Upload Section */
.upload-section {
    margin-bottom: 40px;
}

.upload-area {
    background: white;
    border: 3px dashed #667eea;
    border-radius: 15px;
    padding: 60px 20px;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.upload-area:hover {
    border-color: #764ba2;
    background: #f8f9ff;
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.upload-area.dragover {
    border-color: #28a745;
    background: #f0fff4;
    transform: scale(1.02);
}

.upload-content {
    position: relative;
    z-index: 2;
}

.upload-icon {
    font-size: 4rem;
    color: #667eea;
    margin-bottom: 20px;
    display: block;
}

.upload-area h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: #333;
}

.upload-area p {
    font-size: 1.1rem;
    margin: 10px 0;
    color: #666;
}

.btn-primary {
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    margin: 20px 0;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.btn-primary i {
    margin-right: 8px;
}

.upload-info {
    font-size: 0.9rem;
    color: #888;
    margin-top: 15px;
}

/* Buttons */
.btn-success {
    background: linear-gradient(45deg, #28a745, #20c997);
    color: white;
    border: none;
    padding: 12px 25px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(40, 167, 69, 0.3);
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(40, 167, 69, 0.4);
}

.btn-download {
    background: linear-gradient(45deg, #007bff, #0056b3);
    color: white;
    border: none;
    padding: 12px 25px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 123, 255, 0.3);
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 123, 255, 0.4);
}

.btn-danger {
    background: linear-gradient(45deg, #dc3545, #c82333);
    color: white;
    border: none;
    padding: 8px 15px;
    font-size: 0.9rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-danger:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(220, 53, 69, 0.3);
}

.btn-convert {
    background: linear-gradient(45deg, #ffc107, #e0a800);
    color: #212529;
    border: none;
    padding: 8px 15px;
    font-size: 0.9rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-convert:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(255, 193, 7, 0.3);
}

/* Sections */
.files-section, .results-section {
    background: white;
    border-radius: 15px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid #f0f0f0;
}

.section-header h2 {
    font-size: 1.8rem;
    color: #333;
    display: flex;
    align-items: center;
}

.section-header h2 i {
    margin-right: 10px;
    color: #667eea;
}

/* Tables */
.table-container {
    overflow-x: auto;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
}

.files-table, .results-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

.files-table th, .results-table th {
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    padding: 15px 10px;
    text-align: left;
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.files-table td, .results-table td {
    padding: 15px 10px;
    border-bottom: 1px solid #f0f0f0;
    vertical-align: middle;
}

.files-table tr:hover, .results-table tr:hover {
    background: #f8f9ff;
}

/* Thumbnails */
.thumbnail {
    width: 60px;
    height: 60px;
    object-fit: cover;
    border-radius: 8px;
    border: 2px solid #e0e0e0;
    transition: all 0.3s ease;
}

.thumbnail:hover {
    transform: scale(1.1);
    border-color: #667eea;
}

/* File info */
.file-name {
    font-weight: 600;
    color: #333;
    max-width: 300px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 0.9rem;
    line-height: 1.4;
    cursor: help;
    position: relative;
}

.file-name:hover {
    color: #667eea;
}

.file-name::after {
    content: attr(title);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: #333;
    color: white;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.8rem;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.file-name:hover::after {
    opacity: 1;
    visibility: visible;
}

.file-format {
    background: #e9ecef;
    color: #495057;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
}

.file-size {
    font-weight: 500;
    color: #666;
}

.size-comparison {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.size-before {
    color: #dc3545;
    font-size: 0.9rem;
}

.size-after {
    color: #28a745;
    font-size: 0.9rem;
    font-weight: 600;
}

/* Progress Section */
.progress-section {
    background: white;
    border-radius: 15px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    text-align: center;
}

.progress-bar {
    width: 100%;
    height: 20px;
    background: #e9ecef;
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 15px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(45deg, #28a745, #20c997);
    width: 0%;
    transition: width 0.3s ease;
    border-radius: 10px;
}

.progress-text {
    font-size: 1.1rem;
    color: #333;
    font-weight: 500;
}

/* Footer */
.footer {
    text-align: center;
    color: white;
    margin-top: 40px;
    padding: 20px;
}

.footer p {
    margin-bottom: 10px;
    font-size: 1rem;
}

.footer a {
    color: #ffd700;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
}

.footer a:hover {
    color: #fff;
    text-shadow: 0 0 10px rgba(255, 215, 0, 0.5);
}

.footer a i {
    margin-right: 8px;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .upload-area {
        padding: 40px 15px;
    }
    
    .section-header {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .files-table, .results-table {
        font-size: 0.8rem;
    }
    
    .files-table th, .results-table th,
    .files-table td, .results-table td {
        padding: 10px 5px;
    }
    
    .thumbnail {
        width: 40px;
        height: 40px;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.files-section, .results-section {
    animation: fadeIn 0.5s ease-out;
}

/* Loading states */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.btn-loading {
    position: relative;
    color: transparent !important;
}

.btn-loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    top: 50%;
    left: 50%;
    margin-left: -8px;
    margin-top: -8px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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