:root {
    --primary-color: #6c63ff;
    --primary-light: #9d97ff;
    --primary-dark: #4b45b3;
    --secondary-color: #03dac6;
    --secondary-dark: #018786;
    --text-color: #333333;
    --text-light: #666666;
    --text-lighter: #999999;
    --bg-color: #f5f7fa;
    --white: #ffffff;
    --error-color: #e53935;
    --warning-color: #ff9800;
    --success-color: #4caf50;
    --border-color: #e0e0e0;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s ease;
    --border-radius: 10px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 20px;
}

.hidden {
    display: none !important;
}

.mt-4 {
    margin-top: 1.5rem;
}

/* Auth Section */
#auth-section {
    display: none;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-light), var(--primary-dark));
    padding: 20px;
}

#auth-section.active-section {
    display: flex;
}

.auth-container {
    background-color: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    width: 100%;
    max-width: 400px;
    overflow: hidden;
    padding: 30px;
    animation: fadeIn 0.5s ease;
}

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

.logo-container {
    text-align: center;
    margin-bottom: 25px;
}

.logo {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: -0.5px;
}

.logo span {
    color: var(--secondary-color);
}

.tagline {
    color: var(--text-light);
    font-size: 14px;
    margin-top: 5px;
}

.tabs {
    display: flex;
    margin-bottom: 25px;
    border-bottom: 1px solid var(--border-color);
}

.tab {
    flex: 1;
    text-align: center;
    padding: 12px 0;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
    color: var(--text-light);
    position: relative;
}

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

.tab.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--primary-color);
    border-radius: 2px 2px 0 0;
}

.form-container {
    display: none;
}

.form-container.active-form {
    display: block;
    animation: fadeIn 0.3s ease;
}

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

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    font-size: 14px;
    color: var(--text-color);
}

input {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    transition: var(--transition);
    background-color: #f9fafc;
}

input:focus {
    border-color: var(--primary-light);
    outline: none;
    box-shadow: 0 0 0 3px rgba(108, 99, 255, 0.1);
    background-color: var(--white);
}

.input-icon {
    position: relative;
}

.input-icon i {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-lighter);
}

.input-icon input {
    padding-left: 40px;
}

.btn {
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    padding: 12px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    transition: var(--transition);
    width: 100%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.btn:active {
    transform: translateY(0);
}

.btn-small {
    padding: 8px 14px;
    font-size: 14px;
    width: auto;
}

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

.btn-danger:hover {
    background-color: #c62828;
}
.side-btn-danger {
    background-color: #c62828;
}

.side-btn-danger:hover {
    background-color: var(--error-color);
}

.message {
    margin-top: 15px;
    text-align: center;
    min-height: 20px;
    font-size: 14px;
    padding: 8px;
    border-radius: 6px;
}

.message.error {
    color: var(--error-color);
    background-color: rgba(229, 57, 53, 0.1);
}

.message.success {
    color: var(--success-color);
    background-color: rgba(76, 175, 80, 0.1);
}

/* Dashboard Section */
#dashboard-section {
    display: none;
    min-height: 100vh;
    background-color: var(--bg-color);
}

#dashboard-section.active-section {
    display: block;
}

.main-header {
    background-color: var(--white);
    box-shadow: 0 2px 8px var(--shadow-color);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 10;
}

.main-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

#username-display {
    font-weight: 600;
    color: var(--text-color);
}

.main-content {
    display: flex;
    margin-top: 20px;
    gap: 20px;
    min-height: calc(100vh - 70px);
    padding-bottom: 30px;
}

.sidebar {
    width: 280px;
    background-color: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    padding: 20px;
    flex-shrink: 0;
    height: fit-content;
    position: sticky;
    top: 85px;
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-header h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-color);
}

.folder-tree, .inventory-tree {
    max-height: 300px;
    overflow-y: auto;
    padding-right: 5px;
}

.folder-tree::-webkit-scrollbar, .inventory-tree::-webkit-scrollbar {
    width: 6px;
}

.folder-tree::-webkit-scrollbar-thumb, .inventory-tree::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 3px;
}

.folder-tree::-webkit-scrollbar-track, .inventory-tree::-webkit-scrollbar-track {
    background-color: transparent;
}

.folder, .inventory {
    padding: 10px;
    margin-bottom: 5px;
    cursor: pointer;
    display: flex;
    align-items: center;
    border-radius: 6px;
    transition: var(--transition);
}

.folder:hover, .inventory:hover {
    background-color: rgba(108, 99, 255, 0.05);
    color: var(--primary-color);
}

.folder i, .inventory i {
    margin-right: 10px;
    color: var(--text-light);
}

.folder:hover i, .inventory:hover i {
    color: var(--primary-color);
}

.folder.active, .inventory.active {
    background-color: rgba(108, 99, 255, 0.1);
    color: var(--primary-color);
    font-weight: 600;
}

.folder.active i, .inventory.active i {
    color: var(--primary-color);
}

.empty-folder {
    text-align: center;
    color: var(--text-lighter);
    padding: 15px 0;
    font-size: 14px;
}

.content {
    flex-grow: 1;
    background-color: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    padding: 20px;
}

.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

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

.btn-icon {
    background-color: var(--white);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    cursor: pointer;
    padding: 0;
    font-size: 14px;
}

.btn-icon:hover:not(.disabled) {
    background-color: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
}

.btn-icon.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background-color: #f0f0f0;
}

.breadcrumbs {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    font-size: 14px;
}

.breadcrumb-item {
    color: var(--text-color);
    text-decoration: none;
    transition: var(--transition);
}

.breadcrumb-item:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

.breadcrumb-separator {
    margin: 0 8px;
    color: var(--text-light);
}

.items-container {
    padding: 20px;
}

/* Folder grid styling */
.folder-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 15px;
    margin-bottom: 25px;
}

.folder-item {
    background-color: var(--bg-color);
    border-radius: 10px;
    padding: 15px;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}

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

.folder-icon {
    font-size: 36px;
    color: #ffb74d;
    margin-top: -30px;
    transition: var(--transition);
}

.folder-item:hover .folder-icon {
    transform: scale(1.1);
}

.folder-name {
    font-weight: 500;
    word-break: break-word;
    width: 100%;
}

/* Item styling */
.item {
    background-color: var(--bg-color);
    border-radius: 10px;
    padding: 20px;
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: row;
    align-items: center;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}

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

.item-icon {
    font-size: 36px;
    color: var(--primary-color);
    transition: var(--transition);
}

.item:hover .item-icon {
    transform: scale(1.1);
}

.item-name {
    font-weight: 500;
    word-break: break-word;
    flex-grow: 1;
    text-align: left;
    margin-left: 15px;
    width: 100%;
}

.item-actions {
    display: flex;
    justify-content: right;
    gap: 10px;
    width: 40%;
}

.item-link, .delete-item {
    background-color: var(--white);
    color: var(--text-color);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}
.delete-item-side {
    width: 36px;
    height: 36px;
    border-radius: 10%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    align-self: self-end;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    color: var(--white);
    background-color: var(--error-color);
}
.delete-item-side:hover {
    background-color: var(--white);
    color: var(--error-color);
    transform: translateY(-2px);
}
.item-link {
    color: var(--primary-color);
    text-decoration: none;
}

.item-link:hover {
    background-color: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px);
}

.delete-item {
    color: var(--error-color);
    background-color: var(--white);
}

.delete-item:hover {
    background-color: var(--error-color);
    color: var(--white);
    transform: translateY(-2px);
}

.no-items-message {
    grid-column: 1 / -1;
    text-align: center;
    color: var(--text-light);
    padding: 40px 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.no-items-message i {
    color: var(--text-lighter);
    margin-bottom: 10px;
}

.help-text {
    color: var(--text-lighter);
    font-size: 14px;
    margin-top: 5px;
}

.welcome-message {
    grid-column: 1 / -1;
    text-align: center;
    color: var(--text-color);
    padding: 60px 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.welcome-message i {
    color: var(--primary-color);
    margin-bottom: 15px;
}

.welcome-message h2 {
    font-size: 24px;
    margin-bottom: 10px;
}

.welcome-message p {
    color: var(--text-light);
}

/* File Upload Styling */
.file-upload-container {
    position: relative;
    margin-top: 10px;
}

.file-upload-container input[type="file"] {
    position: absolute;
    left: 0;
    top: 0;
    opacity: 0;
    width: 100%;
    height: 100%;
    cursor: pointer;
}

.file-upload-label {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 15px;
    background-color: #f1f3f9;
    border: 1px dashed var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
}

.file-upload-label:hover {
    border-color: var(--primary-color);
    background-color: rgba(108, 99, 255, 0.05);
}

.file-upload-label i {
    color: var(--primary-color);
}

.upload-preview {
    margin: 20px 0;
    padding: 15px;
    background-color: rgba(108, 99, 255, 0.05);
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.preview-icon {
    color: var(--primary-color);
    font-size: 24px;
}

.preview-details {
    flex-grow: 1;
}

#preview-filename {
    font-weight: 600;
    margin-bottom: 5px;
}

#preview-filesize {
    font-size: 13px;
    color: var(--text-light);
}

.progress-container {
    height: 8px;
    background-color: #f1f3f9;
    border-radius: 4px;
    margin: 15px 0;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background-color: var(--primary-color);
    width: 0;
    transition: width 0.3s ease;
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    z-index: 100;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal.active {
    display: flex;
    opacity: 1;
}

.modal-content {
    background-color: var(--white);
    border-radius: var(--border-radius);
    width: 90%;
    max-width: 500px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
    transform: scale(0.9);
    transition: transform 0.3s ease;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
}

.modal.active .modal-content {
    transform: scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 18px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
}

.modal-header h3 i {
    color: var(--primary-color);
}

.modal-body {
    padding: 20px;
    overflow-y: auto;
}

.close {
    font-size: 24px;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-light);
    height: 30px;
    width: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.close:hover {
    color: var(--error-color);
    background-color: rgba(229, 57, 53, 0.1);
}

.warning {
    color: var(--warning-color);
    background-color: rgba(255, 152, 0, 0.1);
    padding: 10px;
    border-radius: 6px;
    margin: 15px 0;
    display: flex;
    align-items: center;
    gap: 10px;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 20px;
}

/* Loading spinner */
.loading-spinner {
    width: 40px;
    height: 40px;
    margin: 20px auto;
    border: 4px solid rgba(108, 99, 255, 0.1);
    border-left-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Responsive */
@media (max-width: 768px) {
    .main-content {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        position: static;
    }
    
    .folder-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    }
    
    .auth-container {
        padding: 20px;
    }
    
    .logo {
        font-size: 28px;
    }
    
    .modal-content {
        width: 95%;
    }
}

@media (max-width: 480px) {
    .folder-grid {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    }
    
    .folder-item, .item {
        padding: 15px 10px;
    }
    
    .toolbar {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
    
    .breadcrumbs {
        width: 100%;
        overflow-x: auto;
        white-space: nowrap;
        padding-bottom: 5px;
    }
    
    .actions {
        width: 100%;
    }
    
    .actions .btn {
        width: 100%;
    }
}