:root {
    /* Brand Palette - Deep Tech */
    --color-bg-dark: #0a0f1c; /* Deepest Blue/Black */
    --color-bg-panel: #111827; /* Panel Background */
    --color-bg-hover: #1f2937;
    
    --color-primary: #3b82f6; /* Olu Blue */
    --color-accent: #0ea5e9; /* Sky Blue */
    
    /* Status Colors (Neon/Vibrant) */
    --color-success: #10b981; /* Neon Green */
    --color-warning: #f59e0b; /* Amber */
    --color-danger: #ef4444; /* Critical Red */
    
    /* Text */
    --color-text-main: #f3f4f6;
    --color-text-muted: #9ca3af;
    
    /* Effects */
    --shadow-glow: 0 0 15px rgba(59, 130, 246, 0.3);
    --border-glass: 1px solid rgba(255, 255, 255, 0.1);
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
}

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

body {
    background-color: var(--color-bg-dark);
    color: var(--color-text-main);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

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

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: rgba(17, 24, 39, 0.8);
    backdrop-filter: blur(10px);
    border-right: var(--border-glass);
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    position: fixed;
    height: 100%;
}

.brand {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 2.5rem;
    letter-spacing: -0.025em;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.brand span {
    color: var(--color-text-main);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    color: var(--color-text-muted);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
    margin-bottom: 0.5rem;
}

.nav-link:hover, .nav-link.active {
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--color-primary);
}

.nav-link.active {
    box-shadow: 0 0 0 1px rgba(59, 130, 246, 0.2);
}

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

/* Header */
.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2.5rem;
}

.page-title {
    font-size: 1.875rem;
    font-weight: 700;
}

/* Cards */
.card {
    background-color: var(--color-bg-panel);
    border: var(--border-glass);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--color-text-main);
}

/* Status Indicators */
.status-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
}

.status-success {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--color-success);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.status-warning {
    background-color: rgba(245, 158, 11, 0.1);
    color: var(--color-warning);
    border: 1px solid rgba(245, 158, 11, 0.2);
}

.status-danger {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--color-danger);
    border: 1px solid rgba(239, 68, 68, 0.2);
}