:root {
    --primary: #0d47a1;
    --primary-light: #1976d2;
    --accent: #ffab00;
    --dark: #1e293b;
    --light: #f8fafc;
    --gray: #64748b;
    --white: #ffffff;
    --sidebar-width: 260px;
    --sidebar-collapsed-width: 70px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: #f1f5f9;
    color: var(--dark);
    margin: 0;
}

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

.sidebar {
    width: var(--sidebar-width);
    background: linear-gradient(180deg, #1e293b 0%, #0f172a 100%);
    color: white;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 1000;
    box-shadow: 4px 0 10px rgba(0,0,0,0.1);
}

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

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

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

/* Topbar */
.topbar {
    height: 64px;
    background: var(--white);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 999;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 12px;
}

.avatar {
    width: 36px;
    height: 36px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
}

/* Sidebar Navigation */
.sidebar-header {
    height: 64px;
    display: flex;
    align-items: center;
    padding: 0 20px;
    font-weight: 800;
    font-size: 1.2rem;
    letter-spacing: -0.5px;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.nav-links {
    padding: 20px 12px;
    flex: 1;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    border-radius: 8px;
    margin-bottom: 4px;
    transition: var(--transition);
}

.nav-item i {
    width: 24px;
    font-size: 1.1rem;
    margin-right: 12px;
}

.nav-item:hover, .nav-item.active {
    background: rgba(255,255,255,0.1);
    color: white;
}

.nav-item.active {
    background: var(--primary);
    box-shadow: 0 4px 12px rgba(13, 71, 161, 0.3);
}

/* Cards & Components */
.card {
    background: white;
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    border: none;
    margin-bottom: 24px;
}

.card-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--gray);
    margin-bottom: 8px;
    text-transform: uppercase;
}

.card-value {
    font-size: 1.8rem;
    font-weight: 700;
}

/* Dashboard Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
    padding: 24px;
}

/* Table styling */
.table-container {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

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

.custom-table th {
    background: #f8fafc;
    padding: 16px;
    text-align: left;
    font-weight: 600;
    color: var(--gray);
    border-bottom: 1px solid #e2e8f0;
}

.custom-table td {
    padding: 16px;
    border-bottom: 1px solid #f1f5f9;
}

.status-badge {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.status-normal { background: #dcfce7; color: #166534; }
.status-critical { background: #fee2e2; color: #991b1b; }

/* Buttons */
.btn-primary {
    background: var(--primary);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary:hover {
    background: var(--primary-light);
    transform: translateY(-1px);
}

/* Animations */
.animate-fade-in {
    animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar { transform: translateX(-100%); }
    .sidebar.open { transform: translateX(0); }
    .main-content { margin-left: 0 !important; }
}