:root {
    --bg-primary: #0a1929;
    --bg-secondary: #112240;
    --bg-card: #1a2f4b;
    --bg-hover: #233554;
    
    --text-primary: #e6f1ff;
    --text-secondary: #8892b0;
    --text-muted: #64748b;
    
    --accent: #64ffda;
    --accent-hover: #4dd0b8;
    
    --border: rgba(100, 255, 218, 0.1);
    --shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
    
    --radius: 8px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Login */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--bg-primary) 0%, #0d1f30 100%);
}

.login-container {
    width: 100%;
    max-width: 420px;
    padding: 20px;
}

.login-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 48px;
    box-shadow: var(--shadow);
    animation: fadeInUp 0.6s ease;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.logo {
    text-align: center;
    margin-bottom: 40px;
}

.logo h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    color: var(--accent);
    margin-bottom: 8px;
}

.logo p {
    color: var(--text-secondary);
    font-size: 1rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(100, 255, 218, 0.1);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-primary {
    width: 100%;
    background: transparent;
    color: var(--accent);
    border: 1px solid var(--accent);
}

.btn-primary:hover:not(:disabled) {
    background: rgba(100, 255, 218, 0.1);
    transform: translateY(-2px);
}

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

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

.error-message {
    color: #f87171;
    font-size: 0.9rem;
    margin-bottom: 16px;
    min-height: 20px;
}

.login-footer {
    text-align: center;
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}

.login-footer p {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Dashboard Layout */
.app-container {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 260px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.sidebar-header {
    padding: 24px;
    border-bottom: 1px solid var(--border);
}

.sidebar-header h2 {
    font-size: 1.2rem;
    color: var(--accent);
    letter-spacing: 0.15em;
}

.sidebar-header p {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-top: 4px;
}

.sidebar-nav {
    flex: 1;
    padding: 16px 0;
}

.sidebar-nav h3 {
    padding: 0 24px;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.sidebar-nav ul {
    list-style: none;
}

.sidebar-nav li a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 24px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    border-left: 3px solid transparent;
}

.sidebar-nav li a:hover,
.sidebar-nav li a.active {
    background: var(--bg-hover);
    color: var(--accent);
    border-left-color: var(--accent);
}

.sidebar-footer {
    padding: 24px;
    border-top: 1px solid var(--border);
}

.main-content {
    flex: 1;
    margin-left: 260px;
    padding: 32px;
    min-height: 100vh;
}

.main-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
}

.main-header h1 {
    font-size: 1.75rem;
    font-weight: 600;
}

.search-box input {
    width: 280px;
    padding: 10px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 0.95rem;
}

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

/* Upload Zone */
.upload-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 48px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    margin-bottom: 24px;
}

.upload-zone:hover,
.upload-zone.dragover {
    border-color: var(--accent);
    background: rgba(100, 255, 218, 0.05);
}

.upload-icon {
    width: 48px;
    height: 48px;
    color: var(--accent);
    margin-bottom: 16px;
}

.upload-content p {
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.upload-link {
    color: var(--accent);
    cursor: pointer;
}

.upload-link:hover {
    text-decoration: underline;
}

.upload-hint {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.upload-progress {
    margin-bottom: 24px;
}

.progress-bar {
    height: 4px;
    background: var(--bg-hover);
    border-radius: 2px;
    overflow: hidden;
}

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

.progress-text {
    display: block;
    margin-top: 8px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Documents Grid */
.documents-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

.document-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    transition: var(--transition);
    cursor: pointer;
}

.document-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.doc-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 12px;
}

.doc-icon {
    font-size: 2rem;
}

.doc-actions {
    display: flex;
    gap: 8px;
}

.doc-actions button {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
    font-size: 1.1rem;
    transition: var(--transition);
}

.doc-actions button:hover {
    color: var(--accent);
}

.doc-name {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.doc-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.doc-category {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
}

.loading {
    text-align: center;
    padding: 48px;
    color: var(--text-muted);
}

.empty {
    text-align: center;
    padding: 48px;
    color: var(--text-muted);
}

/* Admin Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
    margin-bottom: 32px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    text-align: center;
}

.stat-icon {
    font-size: 2rem;
    margin-bottom: 12px;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent);
}

.stat-label {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 4px;
}

.section {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 24px;
}

.section h2 {
    margin-bottom: 20px;
    font-size: 1.2rem;
}

.category-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.category-stat {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--bg-secondary);
    border-radius: var(--radius);
}

.category-stat .dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.recent-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.recent-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px;
    background: var(--bg-secondary);
    border-radius: var(--radius);
}

.recent-item .file-icon {
    font-size: 1.5rem;
}

.recent-item .file-info {
    flex: 1;
}

.recent-item .file-name {
    font-weight: 500;
}

.recent-item .file-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Users Table */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.users-table,
.audit-table {
    width: 100%;
}

.table-row {
    display: grid;
    grid-template-columns: 2fr 2fr 1fr 1fr 1fr auto;
    gap: 16px;
    padding: 12px;
    border-bottom: 1px solid var(--border);
    align-items: center;
}

.table-row.header {
    color: var(--text-muted);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.user-status {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.user-status.active {
    background: rgba(52, 211, 153, 0.2);
    color: #34d399;
}

.user-status.inactive {
    background: rgba(248, 113, 113, 0.2);
    color: #f87171;
}

/* Tabs */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-content {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    width: 100%;
    max-width: 420px;
}

.modal-content h3 {
    margin-bottom: 24px;
}

.modal-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 24px;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        z-index: 100;
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
        padding: 16px;
    }
    
    .main-header {
        flex-direction: column;
        gap: 16px;
        align-items: flex-start;
    }
    
    .search-box input {
        width: 100%;
    }
    
    .documents-grid {
        grid-template-columns: 1fr;
    }
    
    .login-card {
        padding: 32px 24px;
    }
}