/* ========== CSS Reset & Base Styles ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #8b5cf6;
    --danger-color: #ef4444;
    --success-color: #10b981;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --border-color: #e5e7eb;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --card-list-min-height: 120px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    line-height: 1.6;
}

/* ========== Authentication Screen ========== */
.auth-screen {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    padding: 2rem;
}

.auth-container {
    background: white;
    border-radius: 1rem;
    padding: 2.5rem;
    width: 100%;
    max-width: 400px;
    box-shadow: var(--shadow-lg);
}

.auth-container h1 {
    text-align: center;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.auth-subtitle {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.auth-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
    border-bottom: 2px solid var(--border-color);
}

.auth-tab {
    flex: 1;
    padding: 0.75rem;
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all 0.2s;
}

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

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

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.btn-block {
    width: 100%;
}

.user-menu {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-name {
    color: white;
    font-weight: 500;
}

/* ========== Layout ========== */
.container {
    height: 100vh;
    display: flex;
    flex-direction: column;
}

.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 1.5rem 2rem;
    box-shadow: var(--shadow-md);
    z-index: 10;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1600px;
    margin: 0 auto;
}

.header h1 {
    font-size: 1.75rem;
    font-weight: 700;
}

.header-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.search-input {
    padding: 0.625rem 1rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    width: 300px;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    backdrop-filter: blur(10px);
}

.search-input::placeholder {
    color: rgba(255, 255, 255, 0.7);
}

.search-input:focus {
    outline: none;
    background: rgba(255, 255, 255, 0.3);
}

.main-content {
    flex: 1;
    min-height: 0;
    display: flex;
    overflow: hidden;
    max-width: 1600px;
    margin: 0 auto;
    width: 100%;
}

/* ========== Sidebar ========== */
.sidebar {
    width: 280px;
    background: var(--bg-primary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sidebar-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

.folder-tree {
    padding: 0.5rem;
    flex: 1;
}

.folder-item {
    padding: 0.75rem 1rem;
    margin: 0.25rem 0;
    border-radius: 0.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s;
    color: var(--text-primary);
}

.folder-item:hover {
    background: var(--bg-tertiary);
}

.folder-item.active {
    background: var(--primary-color);
    color: white;
}

.folder-item .folder-icon {
    font-size: 1.25rem;
}

.folder-item .delete-folder {
    margin-left: auto;
    padding: 0.25rem 0.5rem;
    background: transparent;
    border: none;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.2s;
    color: var(--danger-color);
}

.folder-item:hover .delete-folder {
    opacity: 1;
}

/* ========== Content Area ========== */
.content-area {
    flex: 1;
    min-height: 0;
    background: var(--bg-primary);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.content-header {
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.content-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.filter-controls {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    flex-wrap: wrap;
}

.filter-select {
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    font-size: 0.875rem;
    background: white;
    cursor: pointer;
    transition: all 0.2s;
    min-width: 140px;
}

.filter-select:hover {
    border-color: var(--primary-color);
}

.filter-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.btn-filter {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    background: white;
    cursor: pointer;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    transition: all 0.2s;
}

.btn-filter:hover {
    background: var(--bg-tertiary);
}

.view-controls {
    display: flex;
    gap: 0.5rem;
}

.btn-view {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    background: white;
    cursor: pointer;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    transition: all 0.2s;
}

.btn-view:hover {
    background: var(--bg-tertiary);
}

.btn-view.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.file-grid {
    flex: 1;
    min-height: 0;
    overflow-y: auto;
    padding: 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
    align-content: start;
}

.file-grid.list-view {
    grid-template-columns: 1fr;
}

.file-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    overflow: hidden;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: var(--shadow);
    height: 320px;
    display: flex;
    flex-direction: column;
}

.file-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.file-preview {
    width: 100%;
    height: 180px;
    min-height: 180px;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: var(--text-secondary);
    flex-shrink: 0;
    overflow: hidden;
    position: relative;
}

.file-preview img,
.file-preview canvas {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.file-preview iframe {
    width: 100%;
    height: 100%;
    border: none;
    pointer-events: none;
}

.file-card.list-view .file-preview {
    height: 100px;
    min-height: 100px;
    width: 100px;
    min-width: 100px;
}

.file-card.list-view {
    display: flex;
    flex-direction: row;
    gap: 1rem;
    height: var(--card-list-min-height);
}

.file-info {
    padding: 1rem;
    flex: 1;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    min-height: 0;
}

.file-card.list-view .file-info {
    flex: 1;
}

.file-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-meta {
    font-size: 0.875rem;
    color: var(--text-secondary);
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    flex: 1;
    overflow-y: auto;
}

.file-meta-item {
    display: flex;
    gap: 0.5rem;
}

.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.empty-state h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

/* ========== Buttons ========== */
.btn {
    padding: 0.625rem 1.25rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

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

.btn-primary:hover {
    background: rgba(255, 255, 255, 0.9);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: var(--border-color);
}

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

.btn-danger:hover {
    background: #dc2626;
}

.btn-icon {
    padding: 0.5rem;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    cursor: pointer;
    font-size: 1.25rem;
    line-height: 1;
    transition: all 0.2s;
}

.btn-icon:hover {
    background: var(--bg-tertiary);
}

/* ========== Modal ========== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: white;
    border-radius: 1rem;
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

.modal-content.modal-large {
    max-width: 1200px;
}

.modal-content.modal-small {
    max-width: 400px;
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
}

.close-btn {
    background: transparent;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0;
    line-height: 1;
}

.close-btn:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

/* ========== Forms ========== */
.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.625rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-family: inherit;
    transition: all 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-group small {
    display: block;
    margin-top: 0.25rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

/* ========== Detail Modal ========== */
.detail-body {
    padding: 0;
}

.detail-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.preview-section,
.metadata-section {
    padding: 1.5rem;
}

.preview-section {
    border-right: 1px solid var(--border-color);
}

.preview-section h3,
.metadata-section h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.preview-container {
    width: 100%;
    height: 500px;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    overflow: hidden;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.preview-container iframe,
.preview-container img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.preview-icon {
    font-size: 6rem;
    color: var(--text-secondary);
}

.preview-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 1rem;
    justify-content: flex-start;
}

.preview-actions .btn {
    flex: 1;
    justify-content: center;
}

.print-info {
    margin-bottom: 1rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* ========== Responsive ========== */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }
    
    .header-actions {
        width: 100%;
        flex-direction: column;
    }
    
    .search-input {
        width: 100%;
    }
    
    .main-content {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        max-height: 200px;
    }
    
    .file-grid {
        grid-template-columns: 1fr;
    }
    
    .detail-content {
        grid-template-columns: 1fr;
    }
    
    .preview-section {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
}

/* ========== Scrollbar Styling ========== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* ========== User Management Styles ========== */
.modal-large {
    max-width: 900px;
    width: 90%;
}

.user-management-header {
    margin-bottom: 1.5rem;
    display: flex;
    justify-content: flex-end;
}

.user-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 0.5rem;
    overflow: hidden;
}

.user-table thead {
    background: var(--bg-tertiary);
}

.user-table th,
.user-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.user-table th {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.user-table td {
    color: var(--text-secondary);
}

.user-table tbody tr:hover {
    background: var(--bg-secondary);
}

.user-table tbody tr:last-child td {
    border-bottom: none;
}

.user-actions {
    display: flex;
    gap: 0.5rem;
}

.btn-small {
    padding: 0.375rem 0.75rem;
    font-size: 0.875rem;
    border: none;
    border-radius: 0.375rem;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 500;
}

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

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

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

.btn-password:hover {
    background: #7c3aed;
}

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

.btn-delete:hover {
    background: #dc2626;
}

#passwordGroup small {
    display: block;
    margin-top: 0.25rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.empty-users {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-secondary);
}