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svg(viewBox=[-d, -.5*d, 2*d, hf*d].join(' ') 
		| svg { fill: #{darken}; font: #{fs}px consolas, monaco, monospace }
		| svg > [d], [r] { fill: none; stroke: #{llight}; stroke-linecap: round; stroke-width: #{2*sw} }
		| [y] + [d] { stroke: #{darken}; marker-end: url(#e) }
		| [d] + [d] ~ [r] { fill: #{orange}; stroke: #333 }
		| [d] + [y] { font: #{fs}px times new roman, serif }
		| [r] + [d] { stroke: #{orange}; stroke-width: #{~~(3*sw)} }
		| [d] + [d] { stroke: #{purple}; stroke-width: #{4*sw} }
		| [d] ~ [y] { font-style: italic }
		| tspan { font-size: .5em }
	marker#e(markerWidth=ad markerHeight=ad 
						viewBox='0 -4 8 8' 
						orient='auto' refX='7')
		path(d='M8 0 0-4V4')
	//-radius text
	text(x=-.5*(hrd + fs) y=-(.5*hrd + .2*fs)) R
	text(x=.5*(hrd - .2*fs) y=-(.5*hrd + .2*fs)) R
	text(x=.5*(-3*hrd - fs) y=(.5*hrd - .2*fs)) R
	text(x=.5*(3*hrd - .2*fs) y=(.5*hrd - .2*fs)) R
	path(d=`M${-ax} 0H${ax}`)
	text(x=ax - .5*fs y=-.5*fs) x
	text(x=.4*fs y=(hf*ax - .2*fs).toFixed(e)) y
	//-helper circles
	circle(cx=-hrd r=hr)
	circle(cx=hrd r=hr)
	path(d=`M0${-hrd}V${3*hrd}M${-2*hrd} ${hrd}H${2*hrd}`)
	path(d=`M0${-hrd} ${2*hrd} ${hrd} 0 ${3*hrd}${-2*hrd} ${hrd}z
					M${-ram}${ram - hrd}l${ram} ${ram} ${ram}${-ram}M0${ram - hrd}h1
					M${ram - 2*hrd} ${hrd - ram}l${ram} ${ram}${-ram} ${ram}M${ram - 2*hrd} ${hrd}h1
					M${2*hrd - ram} ${hrd - ram}l${-ram} ${ram} ${ram} ${ram}M${2*hrd - ram} ${hrd}h1`)
	circle(cx=-hrd r=pr2)
	circle(cx=hrd r=pr2)
	circle(cy=-hrd r=pr)
	circle(cy=3*hrd r=pr1)
	circle(cy=hrd r=pr2)
	circle(cx=-2*hrd cy=hrd r=pr)
	circle(cx=2*hrd cy=hrd r=pr)
	//-point names
	text(y=-(hrd + .2*fs)) T
	text(x=hrd - .4*fs y=fs) O<tspan>0</tspan>
	text(x=-(hrd + .4*fs) y=fs) O<tspan>1</tspan>
	text(x=.1*fs y=(hrd + .8*fs)) S
	text(x=2*hrd - .2*fs y=(hrd + fs)) B<tspan>0</tspan>
	text(x=-(2*hrd + .6*fs) y=(hrd + fs)) B<tspan>1</tspan>
	text(x=-.8*fs y=(3*hrd + .6*fs)) C

// minimal SVG
<svg viewBox='-2500 -1250 5000 3125' xmlns=''><style>svg{fill:#333;font:150px consolas,monaco,monospace}svg>[d],[r]{fill:none;stroke:#ccc;stroke-linecap:round;stroke-width:10}[y]+[d]{stroke:#333;marker-end:url(#e)}[d]+[d]~[r]{fill:#f90;stroke:#333}[d]+[y]{font:150px times new roman,serif}[r]+[d]{stroke:#f90;stroke-width:15}[d]+[d]{stroke:#95a;stroke-width:20}[d]~[y]{font-style:italic}tspan{font-size:.5em}</style><marker id='e' markerWidth='10' markerHeight='10' viewBox='0 -4 8 8' orient='auto' refX='7'><path d='M8 0 0-4V4'/></marker><text x='-296' y='-251'>R</text><text x='206' y='-251'>R</text><text x='-738' y='191'>R</text><text x='648' y='191'>R</text><path d='M-1230 0H1230'/><text x='1155' y='-75'>x</text><path d='M0-1230V1538'/><text x='60' y='1508'>y</text><circle cx='-442' r='625'/><circle cx='442' r='625'/><path d='M0-442V1326M-884 442H884'/><path d='M0-442 884 442 0 1326-884 442zM-80-362l80 80 80-80M0-362h1M-804 362l80 80-80 80M-804 442h1M804 362l-80 80 80 80M804 442h1'/><circle r='12.5'/><circle cx='-442' r='13'/><circle cx='442' r='13'/><circle cy='-442' r='25'/><circle cy='1326' r='18'/><circle cy='442' r='13'/><circle cx='-884' cy='442' r='25'/><circle cx='884' cy='442' r='25'/><text y='-472'>T</text><text x='382' y='150'>O<tspan>0</tspan></text><text x='-502' y='150'>O<tspan>1</tspan></text><text x='15' y='562'>S</text><text x='854' y='592'>B<tspan>0</tspan></text><text x='-974' y='592'>B<tspan>1</tspan></text><text x='-120' y='1416'>C</text></svg>


                body {
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	margin: 0;
	height: 100vh;

svg { display: block }


                // minimal SVG: