/* Reset y configuración base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f8f9fa;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

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

.header h1 {
    font-size: 2.5rem;
    font-weight: bold;
    color: #2c3e50;
    margin-bottom: 15px;
}

.header p {
    font-size: 1.1rem;
    color: #666;
    max-width: 600px;
    margin: 0 auto;
}

/* Main Content */
.main-content {
    display: flex;
    gap: 30px;
    align-items: flex-start;
}

/* Upload Area */
.upload-area {
    flex: 1;
    background: white;
    border: 3px dashed #ddd;
    border-radius: 15px;
    padding: 60px 40px;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
}

.upload-area:hover {
    border-color: #e74c3c;
    background-color: #fef9f9;
}

.upload-area.dragover {
    border-color: #e74c3c;
    background-color: #fef9f9;
    transform: scale(1.02);
}

.upload-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.select-files-btn {
    background: #e74c3c;
    color: white;
    border: none;
    padding: 20px 40px;
    border-radius: 10px;
    font-size: 1.2rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 10px;
}

.select-files-btn:hover {
    background: #c0392b;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(231, 76, 60, 0.3);
}

.file-icons {
    display: flex;
    gap: 15px;
    justify-content: center;
}

.file-icon {
    width: 50px;
    height: 50px;
    background: #e74c3c;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    position: relative;
}

.file-icon.disabled {
    background: #bdc3c7;
}

.file-icon .cross {
    position: absolute;
    top: -5px;
    right: -5px;
    background: #e74c3c;
    color: white;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: bold;
}

.file-icon.disabled .cross {
    background: #95a5a6;
}

.drop-text {
    color: #666;
    font-size: 1rem;
    margin-top: 10px;
}

/* Files List */
.files-list {
    flex: 1;
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.files-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
}

.file-item {
    background: #f8f9fa;
    border-radius: 10px;
    padding: 20px;
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
    cursor: pointer;
}

.file-item:hover {
    background: #e9ecef;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.file-item:hover .remove-btn {
    opacity: 1;
}

.file-icon-large {
    width: 60px;
    height: 60px;
    background: #3498db;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2rem;
    margin: 0 auto 15px;
}

.file-name {
    font-size: 0.9rem;
    color: #333;
    word-break: break-word;
    line-height: 1.3;
}

.remove-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    background: #e74c3c;
    color: white;
    border: none;
    width: 25px;
    height: 25px;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.remove-btn:hover {
    background: #c0392b;
    transform: scale(1.1);
}

/* Sidebar */
.sidebar {
    width: 250px;
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.sidebar h3 {
    font-size: 1.5rem;
    color: #2c3e50;
    margin-bottom: 30px;
}

.sidebar-controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    margin-bottom: 30px;
}

.file-counter {
    position: relative;
}

.counter-icon {
    width: 60px;
    height: 60px;
    background: #e74c3c;
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.counter-icon:hover {
    background: #c0392b;
    transform: scale(1.1);
}

.counter-icon .counter-number {
    font-size: 1.5rem;
    font-weight: bold;
    line-height: 1;
}

.counter-icon .counter-label {
    font-size: 0.6rem;
    font-weight: normal;
    opacity: 0.8;
    margin-top: 2px;
}

.sort-btn {
    background: white;
    border: 2px solid #ddd;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #666;
}

.sort-btn:hover {
    border-color: #e74c3c;
    color: #e74c3c;
}

.convert-btn {
    background: #e74c3c;
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
}

.convert-btn:hover {
    background: #c0392b;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(231, 76, 60, 0.3);
}

.convert-btn:disabled {
    background: #bdc3c7;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* Progress Modal */
.progress-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.progress-content {
    background: white;
    padding: 60px;
    border-radius: 20px;
    text-align: center;
    max-width: 400px;
    width: 90%;
}

.progress-content h3 {
    font-size: 1.5rem;
    color: #2c3e50;
    margin-bottom: 30px;
}

.progress-circle {
    position: relative;
    width: 150px;
    height: 150px;
    margin: 0 auto;
}

.progress-ring {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: conic-gradient(#e74c3c 0deg, #e74c3c 0deg, #ecf0f1 0deg);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.progress-ring::before {
    content: '';
    position: absolute;
    width: 80%;
    height: 80%;
    background: white;
    border-radius: 50%;
}

.progress-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1.5rem;
    font-weight: bold;
    color: #2c3e50;
}

/* Success Modal */
.success-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.success-content {
    background: white;
    padding: 60px;
    border-radius: 20px;
    text-align: center;
    max-width: 500px;
    width: 90%;
}

.success-content h3 {
    font-size: 1.5rem;
    color: #2c3e50;
    margin-bottom: 30px;
}

.success-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
}

.back-btn {
    background: #95a5a6;
    color: white;
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.back-btn:hover {
    background: #7f8c8d;
}

.download-btn {
    background: #e74c3c;
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 10px;
}

.download-btn:hover {
    background: #c0392b;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(231, 76, 60, 0.3);
}

/* Responsive */
@media (max-width: 768px) {
    .main-content {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .upload-area {
        padding: 40px 20px;
    }
    
    .files-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }
}

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

@keyframes slideIn {
    from { transform: translateX(100%); }
    to { transform: translateX(0); }
}

.files-list, .sidebar {
    animation: fadeIn 0.5s ease;
}

.sidebar {
    animation: slideIn 0.5s ease;
}