:root {
    --primary: #4361ee;
    --primary-dark: #3a56d4;
    --primary-light: #4895ef;
    --secondary: #7209b7;
    --secondary-dark: #5a08a5;
    --accent: #f72585;
    --success: #4cc9f0;
    --warning: #f8961e;
    --danger: #f94144;
    --light: #f8f9fa;
    --dark: #212529;
    --gray: #6c757d;
    --gray-light: #e9ecef;
    --gray-dark: #495057;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --border-radius-lg: 16px;
    --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --transition: all 0.3s ease;
}

* {
    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%);
    color: var(--dark);
    line-height: 1.6;
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
}

/* Header Styles */
.app-header {
    text-align: center;
    margin-bottom: 30px;
}

.app-header h1 {
    color: white;
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.tagline {
    color: rgba(255, 255, 255, 0.8);
    font-size: 1.1rem;
    font-weight: 300;
}

/* Card Styles */
.card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.card-header {
    padding: 20px 25px;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    color: white;
    display: flex;
    align-items: center;
    gap: 15px;
}

.card-header i {
    font-size: 1.5rem;
}

.card-header h2 {
    font-size: 1.5rem;
    margin: 0;
}

.card-body {
    padding: 25px;
}

.badge {
    background: rgba(255, 255, 255, 0.2);
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

/* Auth Section */
.auth-card {
    max-width: 600px;
    margin: 0 auto 40px;
}

.auth-description {
    margin-bottom: 20px;
    color: var(--gray);
    text-align: center;
}

.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--dark);
}

.input-group input {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--gray-light);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
}

.input-group input:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
}

/* Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 24px;
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn:hover {
    transform: translateY(-2px);
}

.btn-primary {
    background: var(--primary);
}

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-secondary {
    background: var(--gray);
}

.btn-secondary:hover {
    background: var(--gray-dark);
}

.btn-success {
    background: var(--success);
}

.btn-success:hover {
    background: #3ab0d5;
}

.btn-danger {
    background: var(--danger);
}

.btn-danger:hover {
    background: #d32f2f;
}

.btn-warning {
    background: var(--warning);
}

.btn-warning:hover {
    background: #e68900;
}

/* Content Section */
#content-container {
    display: none;
}

.content-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    padding: 15px 20px;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 10px;
}

.breadcrumb-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--gray);
    font-weight: 500;
}

.breadcrumb-item.active {
    color: var(--primary);
}

.breadcrumb-separator {
    color: var(--gray);
}

.content-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

/* Search Styles */
.search-container {
    position: relative;
    margin-bottom: 20px;
}

.search-container i {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray);
}

.search-container input {
    width: 100%;
    padding: 12px 12px 12px 45px;
    border: 2px solid var(--gray-light);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
}

.search-container input:focus {
    border-color: var(--primary);
    outline: none;
}

/* List Styles */
#folder-list, #file-list {
    list-style: none;
    margin-bottom: 25px;
    max-height: 400px;
    overflow-y: auto;
    border: 1px solid var(--gray-light);
    border-radius: var(--border-radius);
}

#folder-list li, #file-list li {
    padding: 15px 20px;
    border-bottom: 1px solid var(--gray-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

#folder-list li:last-child, #file-list li:last-child {
    border-bottom: none;
}

#folder-list li:hover, #file-list li:hover {
    background-color: rgba(67, 97, 238, 0.05);
}

.folder-link {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--primary);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    flex: 1;
}

.folder-link:hover {
    color: var(--secondary);
}

.folder-link i {
    font-size: 1.2rem;
}

.file-item {
    display: flex;
    align-items: center;
    gap: 15px;
    flex: 1;
}

.file-icon {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
}

.file-icon.image { background: linear-gradient(135deg, var(--primary-light), var(--secondary)); }
.file-icon.pdf { background: linear-gradient(135deg, #e74c3c, #c0392b); }
.file-icon.document { background: linear-gradient(135deg, #3498db, #2980b9); }
.file-icon.other { background: linear-gradient(135deg, #95a5a6, #7f8c8d); }

.file-info {
    flex: 1;
}

.file-name {
    font-weight: 500;
    color: var(--dark);
    margin-bottom: 4px;
}

.file-meta {
    font-size: 0.8rem;
    color: var(--gray);
}

.button-container {
    display: flex;
    gap: 8px;
}

.btn-icon {
    padding: 8px 12px;
    border-radius: var(--border-radius-sm);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-view {
    background: var(--success);
    color: white;
}

.btn-download {
    background: var(--primary);
    color: white;
}

.btn-rename {
    background: var(--warning);
    color: white;
}

.btn-delete {
    background: var(--danger);
    color: white;
}

.btn-copy {
    background: var(--secondary);
    color: white;
}

.btn-icon:hover {
    transform: scale(1.05);
}

/* Action Containers */
.action-container {
    display: flex;
    gap: 15px;
}

.action-container input {
    flex: 1;
    padding: 12px 16px;
    border: 2px solid var(--gray-light);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
}

.action-container input:focus {
    border-color: var(--primary);
    outline: none;
}

.file-input-wrapper {
    flex: 1;
    position: relative;
}

.file-input-wrapper input[type="file"] {
    position: absolute;
    left: -9999px;
}

.file-input-label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 12px 16px;
    background: var(--gray-light);
    border: 2px dashed var(--gray);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.file-input-label:hover {
    border-color: var(--primary);
    background: rgba(67, 97, 238, 0.05);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--gray);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 15px;
    color: var(--gray-light);
}

.empty-state-subtitle {
    font-size: 0.9rem;
    margin-top: 5px;
    color: var(--gray);
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
}

.modal-content {
    background-color: white;
    margin: 10% auto;
    padding: 0;
    border-radius: var(--border-radius);
    width: 90%;
    max-width: 500px;
    box-shadow: var(--shadow-lg);
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    padding: 20px 25px;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    margin: 0;
    font-size: 1.3rem;
}

.close {
    font-size: 1.5rem;
    cursor: pointer;
    transition: var(--transition);
}

.close:hover {
    color: var(--gray-light);
}

.modal-body {
    padding: 25px;
}

.modal-footer {
    padding: 20px 25px;
    background: var(--gray-light);
    display: flex;
    justify-content: flex-end;
    gap: 15px;
}

/* Responsive Design */
@media (max-width: 1200px) {
    .content-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

@media (max-width: 768px) {
    body {
        padding: 15px;
    }
    
    .app-header h1 {
        font-size: 2rem;
    }
    
    .content-header {
        flex-direction: column;
        gap: 15px;
        align-items: flex-start;
    }
    
    .card-body {
        padding: 20px;
    }
    
    .action-container {
        flex-direction: column;
    }
    
    .button-container {
        flex-wrap: wrap;
    }
    
    .modal-content {
        width: 95%;
        margin: 5% auto;
    }
}

@media (max-width: 576px) {
    .app-header h1 {
        font-size: 1.8rem;
    }
    
    .card-header {
        padding: 15px 20px;
    }
    
    .card-body {
        padding: 15px;
    }
    
    #folder-list li, #file-list li {
        padding: 12px 15px;
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .button-container {
        align-self: flex-end;
    }
}

/* Loading Animation */
.loader {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

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

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--gray-light);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* Selection */
::selection {
    background: rgba(67, 97, 238, 0.2);
}