:root {
    --bg-color: #f3f6fc;
    --sidebar-bg: #ffffff;
    --card-bg: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --border-color: #e2e8f0;
    
    --success-bg: #dcfce7;
    --success-text: #166534;
    --success-icon: #22c55e;
    
    --warning-bg: #fef9c3;
    --warning-text: #854d0e;
    --warning-icon: #eab308;
    
    --critical-bg: #fee2e2;
    --critical-text: #991b1b;
    --critical-icon: #ef4444;

    --font-family: 'Inter', sans-serif;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

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

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    position: fixed;
    height: 100vh;
    z-index: 10;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: #cbd5e1 transparent;
}

.sidebar::-webkit-scrollbar {
    width: 6px;
}

.sidebar::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
    background-color: #cbd5e1;
    border-radius: 20px;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 2.5rem;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), #818cf8);
    color: white;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
    box-shadow: 0 4px 10px rgba(79, 70, 229, 0.3);
}

.logo-area h2 {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.025em;
}

.nav-menu {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    flex: 1;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    text-decoration: none;
    color: var(--text-muted);
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: all 0.2s ease;
}

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

.nav-item.active {
    background-color: #eef2ff;
    color: var(--primary);
}

/* Submenu Styles */
.nav-group {
    display: flex;
    flex-direction: column;
}

.nav-group .nav-item {
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-submenu {
    display: flex;
    flex-direction: column;
    padding-left: 2.75rem;
    margin-top: 0;
    gap: 0.25rem;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-group.open .nav-submenu {
    max-height: 1000px;
    opacity: 1;
    visibility: visible;
    margin-top: 0.25rem;
    padding-bottom: 0.5rem;
}

.chevron {
    transition: transform 0.3s ease;
    color: var(--text-muted);
}

.nav-group.open .chevron {
    transform: rotate(180deg);
}

.nav-submenu-item {
    font-size: 0.8125rem;
    color: var(--text-muted);
    text-decoration: none;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
    font-weight: 500;
}

.nav-submenu-item:hover {
    color: var(--primary);
    background-color: #f8fafc;
}

.nav-submenu-item.active {
    color: var(--primary);
    background-color: #eef2ff;
    font-weight: 600;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    margin-top: auto;
}

.user-profile img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
}

.user-info .name {
    font-size: 0.875rem;
    font-weight: 600;
}

.user-info .role {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 260px;
    padding: 2rem 3rem;
    max-width: 1400px;
}

/* Header */
.top-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 2rem;
}

.top-header h1 {
    font-size: 1.875rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    margin-bottom: 0.25rem;
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.95rem;
}

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

.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-box svg {
    position: absolute;
    left: 1rem;
    color: var(--text-muted);
}

.search-box input {
    padding: 0.6rem 1rem 0.6rem 2.5rem;
    border: 1px solid var(--border-color);
    border-radius: 2rem;
    outline: none;
    font-family: inherit;
    font-size: 0.9rem;
    transition: all 0.2s;
    width: 250px;
}

.search-box input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79,70,229,0.1);
}

/* Buttons */
.btn-primary {
    background: var(--primary);
    color: white;
    border: none;
    padding: 0.6rem 1.25rem;
    border-radius: 2rem;
    font-weight: 500;
    font-size: 0.9rem;
    font-family: inherit;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s;
    box-shadow: 0 4px 6px rgba(79,70,229,0.2);
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 6px 12px rgba(79,70,229,0.3);
}

.btn-secondary {
    background: white;
    color: var(--text-main);
    border: 1px solid var(--border-color);
    padding: 0.6rem 1.25rem;
    border-radius: 2rem;
    font-weight: 500;
    font-size: 0.9rem;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s;
}

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

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    display: flex;
    gap: 1rem;
    align-items: center;
    border: 1px solid var(--border-color);
    transition: transform 0.2s, box-shadow 0.2s;
}

.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.stat-icon.info {
    background: #e0e7ff;
    color: var(--primary);
}

.stat-icon.warning {
    background: var(--warning-bg);
    color: var(--warning-icon);
}

.stat-icon.success {
    background: var(--success-bg);
    color: var(--success-icon);
}

.stat-info h3 {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.stat-info .value {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.stat-info .trend {
    font-size: 0.75rem;
    font-weight: 500;
}

.trend.positive { color: var(--success-icon); }
.trend.negative { color: var(--critical-icon); }

/* Table Section */
.table-container {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

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

.table-header h2 {
    font-size: 1.125rem;
    font-weight: 600;
}

.table-filters {
    display: flex;
    gap: 0.75rem;
}

.select-box {
    padding: 0.5rem 2rem 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    outline: none;
    font-family: inherit;
    font-size: 0.875rem;
    color: var(--text-main);
    background-color: white;
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 1em;
    cursor: pointer;
}

.table-responsive {
    overflow-x: auto;
}

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

.log-table th {
    background-color: #f8fafc;
    text-align: left;
    padding: 1rem 1.5rem;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    font-weight: 600;
    border-bottom: 1px solid var(--border-color);
}

.log-table td {
    padding: 1rem 1.5rem;
    font-size: 0.875rem;
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
}

.font-medium {
    font-weight: 500;
}

.log-table tbody tr {
    transition: background-color 0.15s;
}

.log-table tbody tr:hover {
    background-color: #f8fafc;
}

.badge {
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    font-weight: 500;
}

.badge.gray {
    background-color: #f1f5f9;
    color: #475569;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.35rem 0.75rem;
    border-radius: 2rem;
    font-size: 0.75rem;
    font-weight: 600;
}

.status-badge.success {
    background-color: var(--success-bg);
    color: var(--success-text);
}

.status-badge.warning {
    background-color: var(--warning-bg);
    color: var(--warning-text);
}

.status-badge.critical {
    background-color: var(--critical-bg);
    color: var(--critical-text);
}

.operator-cell {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.avatar-sm {
    width: 24px;
    height: 24px;
    border-radius: 50%;
}

.btn-icon {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.35rem;
    border-radius: 0.25rem;
    transition: color 0.15s, background-color 0.15s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-icon:hover {
    background-color: #e2e8f0;
    color: var(--text-main);
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(15, 23, 42, 0.5);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 50;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: white;
    width: 100%;
    max-width: 550px;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    transform: scale(0.95) translateY(20px);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-overlay.active .modal-content {
    transform: scale(1) translateY(0);
}

.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: 1.25rem;
    font-weight: 600;
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-muted);
    cursor: pointer;
    line-height: 1;
    transition: color 0.2s;
}

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

.modal-body {
    padding: 1.5rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.875rem;
    transition: all 0.2s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79,70,229,0.1);
}

textarea.form-control {
    resize: vertical;
    min-height: 80px;
}

.modal-footer {
    padding: 1.25rem 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    background-color: #f8fafc;
    border-bottom-left-radius: var(--radius-xl);
    border-bottom-right-radius: var(--radius-xl);
}

/* Responsive adjustments */
@media (max-width: 1024px) {
    .sidebar {
        width: 80px;
        padding: 1.5rem 0.5rem;
    }
    .logo-area h2, .nav-item {
        font-size: 0;
        gap: 0;
        justify-content: center;
    }
    .user-info {
        display: none;
    }
    .main-content {
        margin-left: 80px;
        padding: 2rem;
    }
}

/* =========================================
   Loading Overlay
========================================= */
.global-loader {
    position: fixed;
    top: 0; left: 0; width: 100vw; height: 100vh;
    background: rgba(255, 255, 255, 0.85);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 99999;
    visibility: hidden;
    opacity: 0;
    transition: all 0.3s ease;
}
.global-loader.active {
    visibility: visible;
    opacity: 1;
}
.spinner {
    width: 40px; height: 40px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}
.global-loader p {
    color: var(--text-main);
    font-size: 1.1rem;
    font-weight: 600;
}
@keyframes spin { 100% { transform: rotate(360deg); } }

/* =========================================
   Responsive Card View (v2.2)
========================================= */
.card-list {
    display: none;
    flex-direction: column;
    gap: 1.25rem;
    padding: 0.5rem;
}

.log-card {
    background: white;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
}

.log-card:active {
    transform: scale(0.98);
}

.card-header {
    background: #f8fafc;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-date {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.card-date .label {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.card-date .value {
    font-weight: 700;
    color: var(--text-main);
    font-size: 0.95rem;
}

.card-body {
    padding: 1.25rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
}

.card-info-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.card-info-group.full-width {
    grid-column: span 2;
}

.card-info-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 600;
}

.card-info-value {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-main);
}

.card-footer {
    padding: 1rem;
    background: #fdfdfd;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.btn-card-action {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.875rem;
    border-radius: var(--radius-md);
    font-size: 0.8125rem;
    font-weight: 600;
    border: 1px solid var(--border-color);
    background: white;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-card-action.view { color: var(--primary); border-color: #e0e7ff; }
.btn-card-action.edit { color: #0ea5e9; border-color: #e0f2fe; }
.btn-card-action.delete { color: #ef4444; border-color: #fee2e2; }

.btn-card-action:hover {
    background: #f8fafc;
}

/* Response Toggles */
@media (max-width: 768px) {
    .table-responsive {
        display: none !important;
    }
    .card-list {
        display: flex;
    }
    .main-content {
        margin-left: 0;
        padding: 1rem;
        width: 100%;
    }
    .sidebar {
        display: none;
    }
    .stats-grid {
        grid-template-columns: 1fr;
    }
    .table-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    .header-actions-extended, .table-filters {
        width: 100%;
        overflow-x: auto;
        padding-bottom: 0.5rem;
    }
}