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

/* Utility Classes */
.hidden {
    display: none !important;
}

:root {
    --primary-color: #00A0DF;
    --primary-hover: #0088C7;
    --success-color: #28A745;
    --danger-color: #DC3545;
    --warning-color: #FFC107;
    --info-color: #17A2B8;
    --gray-100: #F8F9FA;
    --gray-200: #E9ECEF;
    --gray-300: #DEE2E6;
    --gray-400: #CED4DA;
    --gray-500: #ADB5BD;
    --gray-600: #6C757D;
    --gray-700: #495057;
    --gray-800: #343A40;
    --gray-900: #212529;
    --white: #FFFFFF;
    --sidebar-width: 240px;
    --sidebar-collapsed-width: 60px;
    --border-radius: 8px;
    --shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: var(--gray-900);
    background-color: var(--gray-100);
    overflow-x: hidden;
}

/* Layout */
#app {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--white);
    border-right: 1px solid var(--gray-300);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    left: 0;
    top: 0;
    z-index: 1000;
    transition: var(--transition);
}

.sidebar.collapsed {
    width: var(--sidebar-collapsed-width);
}

.sidebar-header {
    padding: 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--gray-300);
}

.logo {
    font-size: 20px;
    font-weight: bold;
    color: var(--primary-color);
}

.sidebar-toggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    color: var(--gray-600);
    transition: var(--transition);
}

.sidebar-toggle:hover {
    color: var(--gray-900);
    background: var(--gray-100);
    border-radius: 4px;
}

.sidebar-nav {
    flex: 1;
    padding: 8px 0;
    overflow-y: auto;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    color: var(--gray-700);
    text-decoration: none;
    transition: var(--transition);
    gap: 12px;
}

.nav-item:hover {
    background: var(--gray-100);
    color: var(--primary-color);
}

.nav-item.active {
    background: var(--gray-100);
    color: var(--primary-color);
    border-left: 3px solid var(--primary-color);
    padding-left: 13px;
}

.nav-item svg {
    flex-shrink: 0;
}

.sidebar.collapsed .nav-item span {
    display: none;
}

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--gray-300);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--primary-color);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    flex-shrink: 0;
}

.user-details {
    flex: 1;
    min-width: 0;
}

.user-name {
    font-weight: 500;
    font-size: 14px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-role {
    font-size: 12px;
    color: var(--gray-600);
}

.sidebar.collapsed .user-details {
    display: none;
}

.btn-logout {
    width: 100%;
    padding: 8px;
    background: var(--gray-200);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition);
}

.btn-logout:hover {
    background: var(--gray-300);
}

.sidebar.collapsed .btn-logout {
    padding: 8px;
    font-size: 0;
}

.sidebar.collapsed .btn-logout::after {
    content: "→";
    font-size: 16px;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    transition: var(--transition);
}

.sidebar.collapsed ~ .main-content {
    margin-left: var(--sidebar-collapsed-width);
}

.main-header {
    background: var(--white);
    border-bottom: 1px solid var(--gray-300);
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
}

.page-title {
    font-size: 24px;
    font-weight: bold;
    color: var(--gray-900);
}

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

.search-box {
    display: flex;
    align-items: center;
    background: var(--gray-100);
    border: 1px solid var(--gray-300);
    border-radius: 4px;
    padding: 8px 12px;
    gap: 8px;
    min-width: 300px;
}

.search-box svg {
    color: var(--gray-600);
    flex-shrink: 0;
}

.search-box input {
    border: none;
    background: none;
    outline: none;
    flex: 1;
    font-size: 14px;
}

/* Buttons */
.btn {
    padding: 10px 16px;
    border: none;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
    text-decoration: none;
}

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

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

.btn-secondary {
    background: var(--gray-200);
    color: var(--gray-900);
}

.btn-secondary:hover {
    background: var(--gray-300);
}

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

.btn-danger:hover {
    background: #C82333;
}

.btn-block {
    width: 100%;
    justify-content: center;
}

/* Content Area */
.content-area {
    flex: 1;
    padding: 24px;
    overflow-y: auto;
}

.page {
    display: block;
}

.page.hidden {
    display: none;
}

/* Login Page */
.login-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: var(--gray-100);
}

.login-box {
    background: var(--white);
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 400px;
}

.login-title {
    text-align: center;
    margin-bottom: 32px;
    color: var(--primary-color);
    font-size: 28px;
}

/* Forms */
.form-group {
    margin-bottom: 20px;
}

.form-row {
    display: flex;
    gap: 16px;
}

.form-row .form-group {
    flex: 1;
}

.form-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--gray-300);
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--gray-700);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--gray-300);
    border-radius: 4px;
    font-size: 14px;
    transition: var(--transition);
}

.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(0, 160, 223, 0.1);
}

.form-group input.error,
.form-group select.error,
.form-group textarea.error {
    border-color: var(--danger-color);
}

/* Dashboard */
.dashboard {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.stat-card {
    background: var(--white);
    padding: 24px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.stat-value {
    font-size: 32px;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.stat-label {
    color: var(--gray-600);
    font-size: 14px;
}

.dashboard-widgets {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 20px;
}

.widget {
    background: var(--white);
    padding: 24px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.widget h3 {
    margin-bottom: 16px;
    color: var(--gray-900);
}

/* Page Toolbar */
.page-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    gap: 16px;
}

.view-switcher {
    display: flex;
    gap: 8px;
    background: var(--white);
    padding: 4px;
    border-radius: 4px;
    border: 1px solid var(--gray-300);
}

.view-btn {
    padding: 8px 16px;
    border: none;
    background: none;
    cursor: pointer;
    border-radius: 4px;
    transition: var(--transition);
    font-size: 14px;
}

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

.filters {
    display: flex;
    gap: 12px;
}

.filter-select {
    padding: 8px 12px;
    border: 1px solid var(--gray-300);
    border-radius: 4px;
    background: var(--white);
    font-size: 14px;
}

.search-input {
    padding: 10px 12px;
    border: 1px solid var(--gray-300);
    border-radius: 4px;
    font-size: 14px;
    min-width: 300px;
}

/* Table/List View */
.table-container {
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table thead {
    background: var(--gray-100);
}

.table th {
    padding: 12px 16px;
    text-align: left;
    font-weight: 600;
    color: var(--gray-700);
    border-bottom: 2px solid var(--gray-300);
}

.table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--gray-200);
}

.table tbody tr {
    transition: var(--transition);
}

.table tbody tr:hover {
    background: var(--gray-100);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    width: 90%;
    max-width: 800px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--gray-300);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-header h3 {
    font-size: 20px;
    font-weight: bold;
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--gray-600);
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: var(--transition);
}

.modal-close:hover {
    background: var(--gray-100);
    color: var(--gray-900);
}

.modal-body {
    padding: 24px;
    overflow-y: auto;
    flex: 1;
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 3000;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.toast {
    background: var(--white);
    padding: 16px 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 300px;
    animation: slideIn 0.3s ease;
}

.toast.success {
    border-left: 4px solid var(--success-color);
}

.toast.error {
    border-left: 4px solid var(--danger-color);
}

.toast.info {
    border-left: 4px solid var(--info-color);
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Loading */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 4000;
}

.loading-overlay.hidden {
    display: none;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--gray-300);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Badge */
.badge {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
    background: var(--gray-200);
    color: var(--gray-700);
}

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

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

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

/* Settings Tabs */
.settings-tabs {
    display: flex;
    gap: 8px;
    border-bottom: 2px solid var(--gray-200);
    margin-bottom: 24px;
}

.settings-tab {
    padding: 12px 20px;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-600);
    transition: var(--transition);
    margin-bottom: -2px;
}

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

.settings-tab-content {
    display: none;
}

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

/* Plugins */
.plugins-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.plugin-card {
    background: var(--white);
    border: 1px solid var(--gray-300);
    border-radius: var(--border-radius);
    padding: 20px;
    transition: var(--transition);
}

.plugin-card:hover {
    box-shadow: var(--shadow);
}

.plugin-card.active {
    border-color: var(--primary-color);
    background: var(--gray-100);
}

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

.plugin-header h4 {
    margin: 0;
    font-size: 16px;
    color: var(--gray-900);
}

.plugin-version {
    font-size: 12px;
    color: var(--gray-600);
    background: var(--gray-200);
    padding: 4px 8px;
    border-radius: 4px;
}

.plugin-description {
    color: var(--gray-700);
    font-size: 14px;
    margin-bottom: 12px;
    line-height: 1.5;
}

.plugin-meta {
    margin-bottom: 16px;
    font-size: 12px;
    color: var(--gray-600);
}

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

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.active {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .dashboard-widgets {
        grid-template-columns: 1fr;
    }
}