@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&display=swap');

:root {
    --bg-color: #f8fafc;
    --surface-color: #ffffff;
    --surface-hover: #f8fafc;
    --accent-color: #059669; /* Emerald 600 - Highly professional, accessible green */
    --accent-hover: #047857;
    --accent-glow: rgba(5, 150, 105, 0.08);
    --text-primary: #0f172a; /* Slate 900 - High contrast, readable */
    --text-secondary: #475569; /* Slate 600 */
    --text-muted: #64748b; /* Slate 500 */
    --border-color: #e2e8f0; /* Slate 200 */
    --border-hover: #cbd5e1; /* Slate 300 */
    
    --danger-color: #dc2626; /* Red 600 */
    --danger-glow: rgba(220, 38, 38, 0.08);
    --warning-color: #d97706; /* Amber 600 */
    
    /* Modern Pastel Badge Colors */
    --bg-pdf: #fee2e2; --text-pdf: #991b1b;
    --bg-docx: #dbeafe; --text-docx: #1e40af;
    --bg-xlsx: #dcfce7; --text-xlsx: #166534;
    --bg-ppt: #ffedd5; --text-ppt: #9a3412;
    --bg-link: #e0f2fe; --text-link: #075985;
    --bg-other: #f1f5f9; --text-other: #475569;

    --font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --border-radius: 8px;
    --border-radius-sm: 6px;
    --border-radius-lg: 12px;
    --transition-speed: 0.2s;
    --header-height: 64px;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-secondary);
    font-family: var(--font-family);
    overflow-x: hidden;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: var(--bg-color);
}
::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: var(--border-radius);
}
::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

/* Typography Utility */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color var(--transition-speed);
}
a:hover {
    color: var(--accent-hover);
}

button, input, select, textarea {
    font-family: inherit;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Auth Page layout */
.auth-container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 24px;
    background-color: #f1f5f9;
}

.auth-card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    width: 100%;
    max-width: 400px;
    padding: 32px;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.05), 0 10px 15px -3px rgba(0, 0, 0, 0.05);
    animation: fadeIn var(--transition-speed) ease-out;
}

.brand-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 24px;
    cursor: pointer;
    user-select: none;
}

.brand-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--accent-glow);
    border: 1.5px solid var(--accent-color);
    border-radius: var(--border-radius-sm);
    color: var(--accent-color);
    font-weight: 800;
    font-size: 15px;
}

.brand-name {
    font-size: 19px;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--text-primary);
}

.brand-name span {
    color: var(--accent-color);
}

.auth-title {
    font-size: 20px;
    margin-bottom: 6px;
}

.auth-subtitle {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 16px;
}

.form-label {
    display: block;
    font-size: 11px;
    font-weight: 700;
    margin-bottom: 6px;
    color: var(--text-secondary);
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

.form-control {
    width: 100%;
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 10px 12px;
    color: var(--text-primary);
    font-size: 14px;
    transition: all var(--transition-speed) ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-control::placeholder {
    color: var(--text-muted);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 10px 16px;
    background: var(--accent-color);
    border: none;
    border-radius: var(--border-radius-sm);
    color: #ffffff;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-speed) ease;
}

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

.btn-secondary {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.btn-secondary:hover {
    background: #f8fafc;
    border-color: var(--border-hover);
    color: var(--text-primary);
}

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

.btn-danger:hover {
    background: #b91c1c;
}

.error-message {
    color: var(--danger-color);
    font-size: 13px;
    margin-top: 10px;
    display: none;
}

.auth-footer {
    margin-top: 24px;
    text-align: center;
    font-size: 11px;
    color: var(--text-muted);
}

/* App Container Layout */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    width: 100%;
    overflow-x: hidden;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    padding: 0 24px;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.03);
    height: var(--header-height);
    flex-shrink: 0;
}

.header-left, .header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 8px;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
}

.nav-toggle:hover {
    background: var(--surface-hover);
    color: var(--text-primary);
}

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

.user-avatar {
    width: 32px;
    height: 32px;
    background: var(--accent-glow);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--accent-color);
    border: 1px solid rgba(5, 150, 105, 0.15);
    font-size: 13px;
}

.user-info {
    display: flex;
    flex-direction: column;
}

.user-name {
    font-size: 13px;
    font-weight: 600;
    line-height: 1.2;
    color: var(--text-primary);
}

.user-role {
    font-size: 10px;
    color: var(--accent-color);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    line-height: 1.2;
    margin-top: 1px;
}

.btn-icon {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 8px 12px;
    font-size: 13px;
    font-weight: 600;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-speed);
}

.btn-icon:hover {
    color: var(--text-primary);
    border-color: var(--border-hover);
    background: var(--surface-hover);
}

/* Sidebar and Slide-over Drawer System */
.main-wrapper {
    display: flex;
    flex-direction: row;
    flex-grow: 1;
    position: relative;
    margin-top: var(--header-height);
}

.sidebar {
    width: 260px;
    background: var(--surface-color);
    border-right: 1px solid var(--border-color);
    padding: 24px;
    position: fixed;
    top: var(--header-height);
    left: 0;
    bottom: 0;
    height: calc(100vh - var(--header-height));
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    z-index: 90;
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1), padding 0.3s cubic-bezier(0.4, 0, 0.2, 1), border-right-width 0.3s cubic-bezier(0.4, 0, 0.2, 1), transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

.sidebar-content, .sidebar-footer {
    width: 212px;
    flex-shrink: 0;
}

body.sidebar-collapsed .sidebar {
    width: 0;
    padding-left: 0;
    padding-right: 0;
    border-right-width: 0;
    pointer-events: none;
}

body.sidebar-collapsed .content-area,
body.sidebar-collapsed .admin-view {
    margin-left: 0;
}

.sidebar-header-mobile {
    display: none;
}

.sidebar-content {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
    min-height: 0;
    overflow: hidden;
}

.sidebar-title {
    font-size: 11px;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 12px;
}

.category-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 4px;
    overflow-y: auto;
    flex-grow: 1;
    padding-right: 4px;
}

.category-item {
    border-radius: var(--border-radius-sm);
    overflow: hidden;
}

.category-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 10px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    border-radius: var(--border-radius-sm);
    transition: background var(--transition-speed), color var(--transition-speed);
    color: var(--text-secondary);
}

.category-header:hover {
    background: var(--surface-hover);
    color: var(--text-primary);
}

.category-header.active {
    background: var(--accent-glow);
    color: var(--accent-color);
}

.category-arrow {
    font-size: 12px;
    font-weight: 600;
    transition: transform var(--transition-speed);
    color: var(--text-muted);
}

.category-item.expanded .category-arrow {
    transform: rotate(90deg);
}

.subcategory-list {
    list-style: none;
    padding-left: 14px;
    margin-top: 2px;
    display: none;
}

.category-item.expanded .subcategory-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.subcategory-item {
    padding: 6px 10px;
    font-size: 12.5px;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: var(--border-radius-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all var(--transition-speed);
}

.subcategory-item:hover {
    color: var(--text-primary);
    background: var(--surface-hover);
}

.subcategory-item.active {
    color: var(--accent-color);
    background: var(--accent-glow);
    font-weight: 600;
}

/* Sidebar Footer (Only visible/active on Mobile) */
.sidebar-footer {
    display: none; /* hidden on desktop */
}

/* Slide-over Overlay */
.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.4);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-speed) ease;
    z-index: 999;
}

.sidebar-overlay.open {
    opacity: 1;
    pointer-events: auto;
}

.content-area {
    flex-grow: 1;
    min-width: 0;
    width: 100%;
    padding: 32px;
    display: flex;
    flex-direction: column;
    animation: fadeIn var(--transition-speed) ease-out;
    margin-left: 260px;
    transition: margin-left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.search-sticky {
    position: sticky;
    top: var(--header-height);
    background: var(--bg-color);
    padding: 16px 0;
    margin-bottom: 20px;
    z-index: 10;
}

.search-container {
    display: flex;
    gap: 12px;
}

.search-wrapper {
    position: relative;
    flex-grow: 1;
}

.search-input {
    width: 100%;
    padding: 10px 14px 10px 36px;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    font-size: 14px;
    transition: all var(--transition-speed);
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.02);
}

.search-input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    display: flex;
    align-items: center;
    pointer-events: none;
}

/* Filter Box */
.filters-section {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 24px;
    padding: 16px;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.02);
}

.filter-row {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: nowrap;
}

.filter-label {
    font-size: 11px;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    min-width: 80px;
    flex-shrink: 0;
}

.chips-container {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.chip {
    padding: 4px 12px;
    background: #f1f5f9;
    border: 1px solid transparent;
    color: var(--text-secondary);
    border-radius: 16px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-speed);
    user-select: none;
}

.chip:hover {
    color: var(--text-primary);
    background: #e2e8f0;
}

.chip.active {
    background: var(--accent-glow);
    border-color: var(--accent-color);
    color: var(--accent-color);
}

/* File Grid and Premium Cards */
.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
    gap: 20px;
}

.file-card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 20px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 100%;
    transition: transform var(--transition-speed), border-color var(--transition-speed), box-shadow var(--transition-speed);
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.03), 0 1px 2px -1px rgba(0, 0, 0, 0.03);
    position: relative;
    overflow: hidden;
}

.file-card:hover {
    transform: translateY(-2px);
    border-color: var(--border-hover);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.file-category-badge {
    font-size: 11px;
    color: var(--text-muted);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.file-type-badge {
    font-size: 10px;
    font-weight: 800;
    padding: 2px 8px;
    border-radius: 4px;
    letter-spacing: 0.05em;
}

/* Type Badge Colors (Soft pastel background with high contrast dark text) */
.file-type-badge.type-pdf { background-color: var(--bg-pdf); color: var(--text-pdf); }
.file-type-badge.type-docx { background-color: var(--bg-docx); color: var(--text-docx); }
.file-type-badge.type-xlsx { background-color: var(--bg-xlsx); color: var(--text-xlsx); }
.file-type-badge.type-ppt { background-color: var(--bg-ppt); color: var(--text-ppt); }
.file-type-badge.type-link { background-color: var(--bg-link); color: var(--text-link); }
.file-type-badge.type-other { background-color: var(--bg-other); color: var(--text-other); }

.file-title {
    font-size: 15.5px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 8px;
}

.card-body {
    margin-bottom: 14px;
    flex-grow: 1;
}

.file-desc {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 12px;
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
}

.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-color);
    padding-top: 12px;
    margin-top: auto;
}

.file-uploader-info {
    font-size: 11px;
    color: var(--text-muted);
    line-height: 1.4;
}

.file-uploader-info span {
    font-weight: 600;
    color: var(--text-secondary);
}

.btn-open {
    display: inline-flex;
    align-items: center;
    padding: 6px 14px;
    font-size: 12px;
    font-weight: 600;
    background: #ffffff;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all var(--transition-speed);
}

.btn-open:hover {
    background: var(--accent-color);
    color: #ffffff;
    border-color: var(--accent-color);
}

/* Modals */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.4);
    backdrop-filter: blur(2px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 24px;
}

.modal-card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 20px 25px -5px rgba(0, 0, 0, 0.05);
    animation: fadeIn var(--transition-speed) ease-out;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
}

.modal-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-primary);
}

.modal-body {
    padding: 20px;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    padding: 12px 20px;
    border-top: 1px solid var(--border-color);
    background: #f8fafc;
}

.admin-view {
    flex-grow: 1;
    min-width: 0;
    width: 100%;
    padding: 32px;
    display: flex;
    flex-direction: column;
    animation: fadeIn var(--transition-speed) ease-out;
    margin-left: 260px;
    transition: margin-left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 16px;
}

.admin-tabs {
    display: flex;
    gap: 4px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 24px;
    overflow-x: auto;
    scrollbar-width: none;
}
.admin-tabs::-webkit-scrollbar {
    display: none;
}

.admin-tab {
    padding: 10px 16px;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 13px;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all var(--transition-speed);
    white-space: nowrap;
}

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

.admin-tab.active {
    color: var(--accent-color);
    border-bottom-color: var(--accent-color);
}

.admin-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 28px;
}

.stat-card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.02);
}

.stat-val {
    font-size: 28px;
    font-weight: 800;
    color: var(--accent-color);
}

.stat-lbl {
    font-size: 11px;
    color: var(--text-muted);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.table-wrapper {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow-x: auto;
    margin-bottom: 24px;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.02);
}

.admin-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 13px;
}

.admin-table th {
    background: #f8fafc;
    padding: 12px 16px;
    font-weight: 700;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
}

.admin-table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
    vertical-align: middle;
}

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

.admin-table tr:hover td {
    background: #f8fafc;
}

.actions-cell {
    display: flex;
    gap: 6px;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
    border-radius: 4px;
    width: auto;
}

.backup-actions {
    display: flex;
    gap: 16px;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 20px;
    margin-bottom: 20px;
    flex-wrap: wrap;
    align-items: center;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.02);
}

.backup-info {
    flex-grow: 1;
}

.backup-title {
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 2px;
}

.backup-desc {
    font-size: 13px;
    color: var(--text-secondary);
}

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

.empty-text {
    font-size: 15px;
    font-weight: 600;
}

/* Site Footer */
.site-footer {
    margin-top: 40px;
    padding: 24px 0;
    text-align: center;
    font-size: 12px;
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
}

/* Responsive Overrides (UX Focused) */
@media (max-width: 1024px) {
    .main-wrapper {
        flex-direction: column;
    }

    /* Transition Sidebar into a Drawer on Mobile/Tablet */
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        width: 280px;
        transform: translateX(-100%);
        z-index: 1001;
        height: 100dvh !important;
        max-height: 100dvh !important;
        box-shadow: 0 0 40px rgba(15, 23, 42, 0.15);
        border-right: 1px solid var(--border-color);
        display: flex;
        flex-direction: column;
        overflow: hidden !important;
    }
    
    .sidebar.open {
        transform: translateX(0);
    }

    .sidebar-header-mobile {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding-bottom: 16px;
        margin-bottom: 16px;
        border-bottom: 1px solid var(--border-color);
    }
    
    .btn-close-sidebar {
        background: transparent;
        border: none;
        color: var(--text-secondary);
        padding: 6px;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .sidebar-footer {
        display: flex;
        flex-direction: column;
        gap: 12px;
        padding-top: 16px;
        margin-top: 24px;
        border-top: 1px solid var(--border-color);
    }

    .user-profile-sidebar {
        display: flex;
        align-items: center;
        gap: 10px;
    }

    .user-name-sidebar {
        font-size: 13px;
        font-weight: 600;
        color: var(--text-primary);
        display: block;
    }

    .user-role-sidebar {
        font-size: 10px;
        color: var(--accent-color);
        font-weight: 700;
        text-transform: uppercase;
        letter-spacing: 0.05em;
        display: block;
        margin-top: 1px;
    }

    .sidebar-actions {
        display: flex;
        flex-direction: column;
        gap: 8px;
    }

    /* Header Cleanup on Mobile/Tablet */
    .nav-toggle {
        display: block;
    }

    .header-profile, .header-logout-btn, .header-admin-btn {
        display: none !important; /* Managed inside mobile sidebar instead */
    }

    .content-area, .admin-view {
        padding: 20px;
        margin-left: 0 !important;
    }

    .filter-row {
        flex-direction: column;
        align-items: flex-start;
        gap: 6px;
        width: 100%;
        min-width: 0;
    }

    .chips-container {
        display: flex;
        flex-wrap: nowrap;
        overflow-x: auto;
        width: 100%;
        padding-bottom: 6px;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
    }

    .chips-container::-webkit-scrollbar {
        display: none;
    }

    .chip {
        flex-shrink: 0;
    }
}

@media (max-width: 640px) {
    .filters-section {
        padding: 12px;
    }

    .filter-label {
        min-width: unset;
    }

    .grid-container {
        grid-template-columns: 1fr; /* Single column on mobile to let cards expand fully */
    }
    
    .file-card {
        padding: 16px;
    }
    
    .file-title {
        font-size: 14.5px;
    }
    
    .file-desc {
        font-size: 12.5px;
        -webkit-line-clamp: 2; /* Truncate description slightly more on small screens */
    }

    .content-area, .admin-view {
        padding: 16px;
        margin-left: 0 !important;
    }
}

.login-divider {
    text-align: center;
    margin: 16px 0;
    position: relative;
}

.login-divider::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--border-color);
    z-index: 1;
}

.login-divider span {
    background: var(--surface-color);
    padding: 0 10px;
    font-size: 12px;
    color: var(--text-muted);
    position: relative;
    z-index: 2;
}