:root {
    /* Premium Light Theme - Industrial Data Fabric */
    --bg: #F9FAFB;
    --surface: #FFFFFF;
    --surface-hover: #F3F4F6;
    --border: #E5E7EB;
    --primary: #0061FF;
    --primary-dark: #0052D9;
    --text: #111827;
    --text-muted: #6B7280;
    --success: #059669;
    --danger: #DC2626;
    --warning: #D97706;
    --sidebar-width: 260px;
    --topbar-height: 70px;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg);
    color: var(--text);
    overflow: hidden;
    line-height: 1.5;
}

body.light-theme {
    background: var(--bg);
    color: var(--text);
}

.app-layout {
    display: flex;
    height: 100vh;
}

/* Sidebar - Professional Refinement */
.sidebar {
    width: var(--sidebar-width);
    background: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    z-index: 100;
}

.sidebar-header {
    padding: 2rem;
    border-bottom: 1px solid var(--border);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-family: 'Outfit', sans-serif;
    font-weight: 800;
    font-size: 1.25rem;
    color: var(--text);
}

.logo-icon {
    width: 32px;
    height: 32px;
    background: var(--primary);
    border-radius: 8px;
}

.sidebar-nav {
    flex: 1;
    padding: 1.5rem 0.8rem;
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    overflow-y: auto;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.6rem 0.8rem;
    text-decoration: none;
    color: var(--text-muted);
    border-radius: 6px;
    font-weight: 500;
    transition: all 0.2s;
    font-size: 0.9rem;
}

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

.nav-item.active {
    background: #EBF2FF;
    color: var(--primary);
}

.sidebar-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--border);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    margin-bottom: 1.5rem;
}

.avatar {
    width: 36px;
    height: 36px;
    background: #EBF2FF;
    color: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
}

.logout-btn {
    width: 100%;
    padding: 0.5rem;
    background: white;
    border: 1px solid var(--border);
    color: var(--danger);
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.85rem;
    transition: 0.2s;
}

.logout-btn:hover {
    background: #FEF2F2;
    border-color: #FCA5A5;
}

/* Main Content Area */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg);
}

.top-bar {
    height: var(--topbar-height);
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2.5rem;
}

.top-bar-left h2 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text);
    font-family: 'Outfit', sans-serif;
}

.context-select {
    padding: 0.4rem 0.8rem;
    background: #F3F4F6;
    border: 1px solid #E5E7EB;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
}

.content-wrapper {
    flex: 1;
    overflow-y: auto;
    padding: 2.5rem;
}

/* Glass Cards & Layout */
.glass-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.75rem;
    box-shadow: var(--shadow);
    margin-bottom: 1.75rem;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.75rem;
}

/* Table Design */
.table-wrapper {
    width: 100%;
    background: var(--surface);
    border-radius: 12px;
    overflow: hidden;
}

table { width: 100%; border-collapse: collapse; }
th { 
    text-align: left; 
    padding: 1rem 1.25rem; 
    background: #F9FAFB;
    border-bottom: 1px solid var(--border); 
    color: var(--text-muted); 
    font-size: 0.75rem; 
    text-transform: uppercase; 
    font-weight: 600;
    letter-spacing: 0.05em;
}
td { 
    padding: 1rem 1.25rem; 
    border-bottom: 1px solid var(--border); 
    font-size: 0.875rem; 
    color: var(--text);
}

/* Professional Buttons */
.btn-primary { 
    background: var(--primary); 
    color: white; 
    border: none; 
    padding: 0.6rem 1.2rem; 
    border-radius: 8px; 
    cursor: pointer; 
    font-weight: 600; 
    font-size: 0.875rem;
    transition: 0.2s;
}
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(0, 97, 255, 0.2); }

.btn-outline { 
    background: white; 
    color: var(--text); 
    border: 1px solid var(--border); 
    padding: 0.6rem 1.2rem; 
    border-radius: 8px; 
    cursor: pointer; 
    font-weight: 600;
    font-size: 0.875rem;
    transition: 0.2s;
}
.btn-outline:hover { background: var(--surface-hover); border-color: #D1D5DB; }

/* Industrial Status Badges */
.badge {
    padding: 0.25rem 0.6rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
}
.badge-active { background: #DCFCE7; color: #166534; }
.badge-connected { background: #DBEAFE; color: #1E40AF; }
.badge-disconnected { background: #F3F4F6; color: #374151; }
.badge-error { background: #FEE2E2; color: #991B1B; }

/* Custom Modal Engine */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.2s ease-out;
}

.modal-card {
    background: var(--surface);
    width: 100%;
    max-width: 450px;
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--shadow-lg);
    transform: scale(0.95);
    transition: 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.modal-overlay.active { display: flex; }
.modal-overlay.active .modal-card { transform: scale(1); }

.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1rem; }
.modal-header h3 { font-family: 'Outfit', sans-serif; font-weight: 700; }
.modal-body { color: var(--text-muted); margin-bottom: 2rem; font-size: 0.95rem; }
.modal-footer { display: flex; justify-content: flex-end; gap: 1rem; }

.fade-in { animation: fadeIn 0.3s ease-out; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }