:root {
    /* Colors */
    --primary-color: #3b82f6;
    --primary-dark: #1d4ed8;
    --primary-gradient: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    --secondary-color: #64748b;
    --success-color: #16a34a;
    --warning-color: #d97706;
    --danger-color: #dc2626;
    --info-color: #06b6d4;

    /* Backgrounds */
    --bg-light: #f8fafc;
    --bg-white: #ffffff;
    --sidebar-bg: linear-gradient(180deg, #1e293b 0%, #0f172a 100%);

    /* Text Colors */
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --text-light: #f8fafc;

    /* Borders & Shadow */
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 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);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Global Responsive Utilities */
.mobile-only {
    display: none !important;
}

@media (max-width: 600px) {
    .mobile-only {
        display: block !important;
    }

    .desktop-only {
        display: none !important;
    }
}

/* Touch Target Size */
button,
.btn,
a,
input,
select,
textarea {
    min-height: 44px;
}

/* Responsive Table Wrapper */
.table-responsive {
    width: 100%;
    margin-bottom: 1rem;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

/* Base Responsive Grid */
.responsive-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--spacing-md);
}

@media (max-width: 600px) {
    .responsive-grid>* {
        grid-column: span 12 !important;
    }
}