/* Raster grid subsystem (rsms.me/raster) */
r-grid {
  display: grid;
  --grid-tc: repeat(24, 1fr);
  grid-template-columns: var(--grid-tc);
  --grid-cs: 1; /* column start */
  --grid-ce: -1; /* column end */
  grid-column-gap: 20px
}

/* r-cell -- cell or column */
r-grid > r-cell { display: block; appearance: none; -webkit-appearance: none }

r-grid[columns="1"] { --grid-tc: repeat(1, 1fr) }
r-grid[columns="2"] { --grid-tc: repeat(2, 1fr) }
r-grid[columns="3"] { --grid-tc: repeat(3, 1fr) }
r-grid[columns="4"] { --grid-tc: repeat(4, 1fr) }
r-grid[columns="5"] { --grid-tc: repeat(5, 1fr) }
r-grid[columns="6"] { --grid-tc: repeat(6, 1fr) }
r-grid[columns="7"] { --grid-tc: repeat(7, 1fr) }
r-grid[columns="8"] { --grid-tc: repeat(8, 1fr) }
r-grid[columns="9"] { --grid-tc: repeat(9, 1fr) }
r-grid[columns="10"] { --grid-tc: repeat(10, 1fr) }
r-grid[columns="11"] { --grid-tc: repeat(11, 1fr) }
r-grid[columns="12"] { --grid-tc: repeat(12, 1fr) }
r-grid[columns="13"] { --grid-tc: repeat(13, 1fr) }
r-grid[columns="14"] { --grid-tc: repeat(14, 1fr) }
r-grid[columns="15"] { --grid-tc: repeat(15, 1fr) }
r-grid[columns="16"] { --grid-tc: repeat(16, 1fr) }
r-grid[columns="17"] { --grid-tc: repeat(17, 1fr) }
r-grid[columns="18"] { --grid-tc: repeat(18, 1fr) }
r-grid[columns="19"] { --grid-tc: repeat(19, 1fr) }
r-grid[columns="20"] { --grid-tc: repeat(20, 1fr) }
r-grid[columns="21"] { --grid-tc: repeat(21, 1fr) }
r-grid[columns="22"] { --grid-tc: repeat(22, 1fr) }
r-grid[columns="23"] { --grid-tc: repeat(23, 1fr) }
r-grid[columns="24"] { --grid-tc: repeat(24, 1fr) }

/* span=start... */
r-grid > r-cell[span^="1"] { --grid-cs: 1 }
r-grid > r-cell[span^="2"] { --grid-cs: 2 }
r-grid > r-cell[span^="3"] { --grid-cs: 3 }
r-grid > r-cell[span^="4"] { --grid-cs: 4 }
r-grid > r-cell[span^="5"] { --grid-cs: 5 }
r-grid > r-cell[span^="6"] { --grid-cs: 6 }
r-grid > r-cell[span^="7"] { --grid-cs: 7 }
r-grid > r-cell[span^="8"] { --grid-cs: 8 }
r-grid > r-cell[span^="9"] { --grid-cs: 9 }
r-grid > r-cell[span^="10"] { --grid-cs: 10 }
r-grid > r-cell[span^="11"] { --grid-cs: 11 }
r-grid > r-cell[span^="12"] { --grid-cs: 12 }
r-grid > r-cell[span^="13"] { --grid-cs: 13 }
r-grid > r-cell[span^="14"] { --grid-cs: 14 }
r-grid > r-cell[span^="15"] { --grid-cs: 15 }
r-grid > r-cell[span^="16"] { --grid-cs: 16 }
r-grid > r-cell[span^="17"] { --grid-cs: 17 }
r-grid > r-cell[span^="18"] { --grid-cs: 18 }
r-grid > r-cell[span^="19"] { --grid-cs: 19 }
r-grid > r-cell[span^="20"] { --grid-cs: 20 }
r-grid > r-cell[span^="21"] { --grid-cs: 21 }
r-grid > r-cell[span^="22"] { --grid-cs: 22 }
r-grid > r-cell[span^="23"] { --grid-cs: 23 }
r-grid > r-cell[span^="24"] { --grid-cs: 24 }

/* span=...+width, span=...-end */
r-grid > r-cell[span$="+1"], r-grid > r-cell[span="1"] { --grid-ce: 1 }
r-grid > r-cell[span$="+2"], r-grid > r-cell[span$="-1"], r-grid > r-cell[span="2"] { --grid-ce: 2 }
r-grid > r-cell[span$="+3"], r-grid > r-cell[span$="-2"], r-grid > r-cell[span="3"] { --grid-ce: 3 }
r-grid > r-cell[span$="+4"], r-grid > r-cell[span$="-3"], r-grid > r-cell[span="4"] { --grid-ce: 4 }
r-grid > r-cell[span$="+5"], r-grid > r-cell[span$="-4"], r-grid > r-cell[span="5"] { --grid-ce: 5 }
r-grid > r-cell[span$="+6"], r-grid > r-cell[span$="-5"], r-grid > r-cell[span="6"] { --grid-ce: 6 }
r-grid > r-cell[span$="+7"], r-grid > r-cell[span$="-6"], r-grid > r-cell[span="7"] { --grid-ce: 7 }
r-grid > r-cell[span$="+8"], r-grid > r-cell[span$="-7"], r-grid > r-cell[span="8"] { --grid-ce: 8 }
r-grid > r-cell[span$="+9"], r-grid > r-cell[span$="-8"], r-grid > r-cell[span="9"] { --grid-ce: 9 }
r-grid > r-cell[span$="+10"], r-grid > r-cell[span$="-9"], r-grid > r-cell[span="10"] { --grid-ce: 10 }
r-grid > r-cell[span$="+11"], r-grid > r-cell[span$="-10"], r-grid > r-cell[span="11"] { --grid-ce: 11 }
r-grid > r-cell[span$="+12"], r-grid > r-cell[span$="-11"], r-grid > r-cell[span="12"] { --grid-ce: 12 }
r-grid > r-cell[span$="+13"], r-grid > r-cell[span$="-12"], r-grid > r-cell[span="13"] { --grid-ce: 13 }
r-grid > r-cell[span$="+14"], r-grid > r-cell[span$="-13"], r-grid > r-cell[span="14"] { --grid-ce: 14 }
r-grid > r-cell[span$="+15"], r-grid > r-cell[span$="-14"], r-grid > r-cell[span="15"] { --grid-ce: 15 }
r-grid > r-cell[span$="+16"], r-grid > r-cell[span$="-15"], r-grid > r-cell[span="16"] { --grid-ce: 16 }
r-grid > r-cell[span$="+17"], r-grid > r-cell[span$="-16"], r-grid > r-cell[span="17"] { --grid-ce: 17 }
r-grid > r-cell[span$="+18"], r-grid > r-cell[span$="-17"], r-grid > r-cell[span="18"] { --grid-ce: 18 }
r-grid > r-cell[span$="+19"], r-grid > r-cell[span$="-18"], r-grid > r-cell[span="19"] { --grid-ce: 19 }
r-grid > r-cell[span$="+20"], r-grid > r-cell[span$="-19"], r-grid > r-cell[span="20"] { --grid-ce: 20 }
r-grid > r-cell[span$="+21"], r-grid > r-cell[span$="-20"], r-grid > r-cell[span="21"] { --grid-ce: 21 }
r-grid > r-cell[span$="+22"], r-grid > r-cell[span$="-21"], r-grid > r-cell[span="22"] { --grid-ce: 22 }
r-grid > r-cell[span$="+23"], r-grid > r-cell[span$="-22"], r-grid > r-cell[span="23"] { --grid-ce: 23 }
r-grid > r-cell[span$="+24"], r-grid > r-cell[span$="-23"], r-grid > r-cell[span="24"] { --grid-ce: 24 }
r-grid > r-cell[span$="-24"] { --grid-ce: 25 }

/* connect vars */
r-grid > r-cell[span] { grid-column-end: span var(--grid-ce) }
r-grid > r-cell[span*="+"], r-grid > r-cell[span*="-"], r-grid > r-cell[span*=".."] {
  grid-column-start: var(--grid-cs) }
r-grid > r-cell[span*="-"], r-grid > r-cell[span*=".."] {
  grid-column-end: var(--grid-ce) }
r-grid > r-cell[span="row"] { grid-column: 1 / -1 }


/* for window width <= 649 */
@media only screen and (max-width: 829px) {
  r-grid[columns-xs="1"] { --grid-tc: repeat(1, 1fr) }
  r-grid[columns-xs="2"] { --grid-tc: repeat(2, 1fr) }
  r-grid[columns-xs="3"] { --grid-tc: repeat(3, 1fr) }
  r-grid[columns-xs="4"] { --grid-tc: repeat(4, 1fr) }
  r-grid[columns-xs="5"] { --grid-tc: repeat(5, 1fr) }
  r-grid[columns-xs="6"] { --grid-tc: repeat(6, 1fr) }
  r-grid[columns-xs="7"] { --grid-tc: repeat(7, 1fr) }
  r-grid[columns-xs="8"] { --grid-tc: repeat(8, 1fr) }
  r-grid[columns-xs="9"] { --grid-tc: repeat(9, 1fr) }
  r-grid[columns-xs="10"] { --grid-tc: repeat(10, 1fr) }
  r-grid[columns-xs="11"] { --grid-tc: repeat(11, 1fr) }
  r-grid[columns-xs="12"] { --grid-tc: repeat(12, 1fr) }
  r-grid[columns-xs="13"] { --grid-tc: repeat(13, 1fr) }
  r-grid[columns-xs="14"] { --grid-tc: repeat(14, 1fr) }
  r-grid[columns-xs="15"] { --grid-tc: repeat(15, 1fr) }
  r-grid[columns-xs="16"] { --grid-tc: repeat(16, 1fr) }
  r-grid[columns-xs="17"] { --grid-tc: repeat(17, 1fr) }
  r-grid[columns-xs="18"] { --grid-tc: repeat(18, 1fr) }
  r-grid[columns-xs="19"] { --grid-tc: repeat(19, 1fr) }
  r-grid[columns-xs="20"] { --grid-tc: repeat(20, 1fr) }
  r-grid[columns-xs="21"] { --grid-tc: repeat(21, 1fr) }
  r-grid[columns-xs="22"] { --grid-tc: repeat(22, 1fr) }
  r-grid[columns-xs="23"] { --grid-tc: repeat(23, 1fr) }
  r-grid[columns-xs="24"] { --grid-tc: repeat(24, 1fr) }

  /* span-xs=start... */
  r-grid > r-cell[span-xs^="1"] { --grid-cs: 1 }
  r-grid > r-cell[span-xs^="2"] { --grid-cs: 2 }
  r-grid > r-cell[span-xs^="3"] { --grid-cs: 3 }
  r-grid > r-cell[span-xs^="4"] { --grid-cs: 4 }
  r-grid > r-cell[span-xs^="5"] { --grid-cs: 5 }
  r-grid > r-cell[span-xs^="6"] { --grid-cs: 6 }
  r-grid > r-cell[span-xs^="7"] { --grid-cs: 7 }
  r-grid > r-cell[span-xs^="8"] { --grid-cs: 8 }
  r-grid > r-cell[span-xs^="9"] { --grid-cs: 9 }
  r-grid > r-cell[span-xs^="10"] { --grid-cs: 10 }
  r-grid > r-cell[span-xs^="11"] { --grid-cs: 11 }
  r-grid > r-cell[span-xs^="12"] { --grid-cs: 12 }
  r-grid > r-cell[span-xs^="13"] { --grid-cs: 13 }
  r-grid > r-cell[span-xs^="14"] { --grid-cs: 14 }
  r-grid > r-cell[span-xs^="15"] { --grid-cs: 15 }
  r-grid > r-cell[span-xs^="16"] { --grid-cs: 16 }
  r-grid > r-cell[span-xs^="17"] { --grid-cs: 17 }
  r-grid > r-cell[span-xs^="18"] { --grid-cs: 18 }
  r-grid > r-cell[span-xs^="19"] { --grid-cs: 19 }
  r-grid > r-cell[span-xs^="20"] { --grid-cs: 20 }
  r-grid > r-cell[span-xs^="21"] { --grid-cs: 21 }
  r-grid > r-cell[span-xs^="22"] { --grid-cs: 22 }
  r-grid > r-cell[span-xs^="23"] { --grid-cs: 23 }
  r-grid > r-cell[span-xs^="24"] { --grid-cs: 24 }

  /* span-xs=...+width, span-xs=...-end */
  r-grid > r-cell[span-xs$="+1"], r-grid > r-cell[span-xs="1"] { --grid-ce: 1 }
  r-grid > r-cell[span-xs$="+2"], r-grid > r-cell[span-xs$="-1"], r-grid > r-cell[span-xs="2"] { --grid-ce: 2 }
  r-grid > r-cell[span-xs$="+3"], r-grid > r-cell[span-xs$="-2"], r-grid > r-cell[span-xs="3"] { --grid-ce: 3 }
  r-grid > r-cell[span-xs$="+4"], r-grid > r-cell[span-xs$="-3"], r-grid > r-cell[span-xs="4"] { --grid-ce: 4 }
  r-grid > r-cell[span-xs$="+5"], r-grid > r-cell[span-xs$="-4"], r-grid > r-cell[span-xs="5"] { --grid-ce: 5 }
  r-grid > r-cell[span-xs$="+6"], r-grid > r-cell[span-xs$="-5"], r-grid > r-cell[span-xs="6"] { --grid-ce: 6 }
  r-grid > r-cell[span-xs$="+7"], r-grid > r-cell[span-xs$="-6"], r-grid > r-cell[span-xs="7"] { --grid-ce: 7 }
  r-grid > r-cell[span-xs$="+8"], r-grid > r-cell[span-xs$="-7"], r-grid > r-cell[span-xs="8"] { --grid-ce: 8 }
  r-grid > r-cell[span-xs$="+9"], r-grid > r-cell[span-xs$="-8"], r-grid > r-cell[span-xs="9"] { --grid-ce: 9 }
  r-grid > r-cell[span-xs$="+10"], r-grid > r-cell[span-xs$="-9"], r-grid > r-cell[span-xs="10"] { --grid-ce: 10 }
  r-grid > r-cell[span-xs$="+11"], r-grid > r-cell[span-xs$="-10"], r-grid > r-cell[span-xs="11"] { --grid-ce: 11 }
  r-grid > r-cell[span-xs$="+12"], r-grid > r-cell[span-xs$="-11"], r-grid > r-cell[span-xs="12"] { --grid-ce: 12 }
  r-grid > r-cell[span-xs$="+13"], r-grid > r-cell[span-xs$="-12"], r-grid > r-cell[span-xs="13"] { --grid-ce: 13 }
  r-grid > r-cell[span-xs$="+14"], r-grid > r-cell[span-xs$="-13"], r-grid > r-cell[span-xs="14"] { --grid-ce: 14 }
  r-grid > r-cell[span-xs$="+15"], r-grid > r-cell[span-xs$="-14"], r-grid > r-cell[span-xs="15"] { --grid-ce: 15 }
  r-grid > r-cell[span-xs$="+16"], r-grid > r-cell[span-xs$="-15"], r-grid > r-cell[span-xs="16"] { --grid-ce: 16 }
  r-grid > r-cell[span-xs$="+17"], r-grid > r-cell[span-xs$="-16"], r-grid > r-cell[span-xs="17"] { --grid-ce: 17 }
  r-grid > r-cell[span-xs$="+18"], r-grid > r-cell[span-xs$="-17"], r-grid > r-cell[span-xs="18"] { --grid-ce: 18 }
  r-grid > r-cell[span-xs$="+19"], r-grid > r-cell[span-xs$="-18"], r-grid > r-cell[span-xs="19"] { --grid-ce: 19 }
  r-grid > r-cell[span-xs$="+20"], r-grid > r-cell[span-xs$="-19"], r-grid > r-cell[span-xs="20"] { --grid-ce: 20 }
  r-grid > r-cell[span-xs$="+21"], r-grid > r-cell[span-xs$="-20"], r-grid > r-cell[span-xs="21"] { --grid-ce: 21 }
  r-grid > r-cell[span-xs$="+22"], r-grid > r-cell[span-xs$="-21"], r-grid > r-cell[span-xs="22"] { --grid-ce: 22 }
  r-grid > r-cell[span-xs$="+23"], r-grid > r-cell[span-xs$="-22"], r-grid > r-cell[span-xs="23"] { --grid-ce: 23 }
  r-grid > r-cell[span-xs$="+24"], r-grid > r-cell[span-xs$="-23"], r-grid > r-cell[span-xs="24"] { --grid-ce: 24 }
  r-grid > r-cell[span-xs$="-24"] { --grid-ce: 25 }

  /* connect vars */
  r-grid > r-cell[span-xs] { grid-column-end: span var(--grid-ce) }
  r-grid > r-cell[span-xs*="+"], r-grid > r-cell[span-xs*="-"], r-grid > r-cell[span-xs*=".."] {
    grid-column-start: var(--grid-cs) }
  r-grid > r-cell[span-xs*="-"], r-grid > r-cell[span-xs*=".."] {
    grid-column-end: var(--grid-ce) }
  r-grid > r-cell[span-xs="row"] { grid-column: 1 / -1 }
}

/* for window width >= 650 */
@media only screen and (min-width: 830px) {
  r-grid[columns-s="1"] { --grid-tc: repeat(1, 1fr) }
  r-grid[columns-s="2"] { --grid-tc: repeat(2, 1fr) }
  r-grid[columns-s="3"] { --grid-tc: repeat(3, 1fr) }
  r-grid[columns-s="4"] { --grid-tc: repeat(4, 1fr) }
  r-grid[columns-s="5"] { --grid-tc: repeat(5, 1fr) }
  r-grid[columns-s="6"] { --grid-tc: repeat(6, 1fr) }
  r-grid[columns-s="7"] { --grid-tc: repeat(7, 1fr) }
  r-grid[columns-s="8"] { --grid-tc: repeat(8, 1fr) }
  r-grid[columns-s="9"] { --grid-tc: repeat(9, 1fr) }
  r-grid[columns-s="10"] { --grid-tc: repeat(10, 1fr) }
  r-grid[columns-s="11"] { --grid-tc: repeat(11, 1fr) }
  r-grid[columns-s="12"] { --grid-tc: repeat(12, 1fr) }
  r-grid[columns-s="13"] { --grid-tc: repeat(13, 1fr) }
  r-grid[columns-s="14"] { --grid-tc: repeat(14, 1fr) }
  r-grid[columns-s="15"] { --grid-tc: repeat(15, 1fr) }
  r-grid[columns-s="16"] { --grid-tc: repeat(16, 1fr) }
  r-grid[columns-s="17"] { --grid-tc: repeat(17, 1fr) }
  r-grid[columns-s="18"] { --grid-tc: repeat(18, 1fr) }
  r-grid[columns-s="19"] { --grid-tc: repeat(19, 1fr) }
  r-grid[columns-s="20"] { --grid-tc: repeat(20, 1fr) }
  r-grid[columns-s="21"] { --grid-tc: repeat(21, 1fr) }
  r-grid[columns-s="22"] { --grid-tc: repeat(22, 1fr) }
  r-grid[columns-s="23"] { --grid-tc: repeat(23, 1fr) }
  r-grid[columns-s="24"] { --grid-tc: repeat(24, 1fr) }

  /* span-s=start... */
  r-grid > r-cell[span-s^="1"] { --grid-cs: 1 }
  r-grid > r-cell[span-s^="2"] { --grid-cs: 2 }
  r-grid > r-cell[span-s^="3"] { --grid-cs: 3 }
  r-grid > r-cell[span-s^="4"] { --grid-cs: 4 }
  r-grid > r-cell[span-s^="5"] { --grid-cs: 5 }
  r-grid > r-cell[span-s^="6"] { --grid-cs: 6 }
  r-grid > r-cell[span-s^="7"] { --grid-cs: 7 }
  r-grid > r-cell[span-s^="8"] { --grid-cs: 8 }
  r-grid > r-cell[span-s^="9"] { --grid-cs: 9 }
  r-grid > r-cell[span-s^="10"] { --grid-cs: 10 }
  r-grid > r-cell[span-s^="11"] { --grid-cs: 11 }
  r-grid > r-cell[span-s^="12"] { --grid-cs: 12 }
  r-grid > r-cell[span-s^="13"] { --grid-cs: 13 }
  r-grid > r-cell[span-s^="14"] { --grid-cs: 14 }
  r-grid > r-cell[span-s^="15"] { --grid-cs: 15 }
  r-grid > r-cell[span-s^="16"] { --grid-cs: 16 }
  r-grid > r-cell[span-s^="17"] { --grid-cs: 17 }
  r-grid > r-cell[span-s^="18"] { --grid-cs: 18 }
  r-grid > r-cell[span-s^="19"] { --grid-cs: 19 }
  r-grid > r-cell[span-s^="20"] { --grid-cs: 20 }
  r-grid > r-cell[span-s^="21"] { --grid-cs: 21 }
  r-grid > r-cell[span-s^="22"] { --grid-cs: 22 }
  r-grid > r-cell[span-s^="23"] { --grid-cs: 23 }
  r-grid > r-cell[span-s^="24"] { --grid-cs: 24 }

  /* span-s=...+width, span-s=...-end */
  r-grid > r-cell[span-s$="+1"], r-grid > r-cell[span-s="1"] { --grid-ce: 1 }
  r-grid > r-cell[span-s$="+2"], r-grid > r-cell[span-s$="-1"], r-grid > r-cell[span-s="2"] { --grid-ce: 2 }
  r-grid > r-cell[span-s$="+3"], r-grid > r-cell[span-s$="-2"], r-grid > r-cell[span-s="3"] { --grid-ce: 3 }
  r-grid > r-cell[span-s$="+4"], r-grid > r-cell[span-s$="-3"], r-grid > r-cell[span-s="4"] { --grid-ce: 4 }
  r-grid > r-cell[span-s$="+5"], r-grid > r-cell[span-s$="-4"], r-grid > r-cell[span-s="5"] { --grid-ce: 5 }
  r-grid > r-cell[span-s$="+6"], r-grid > r-cell[span-s$="-5"], r-grid > r-cell[span-s="6"] { --grid-ce: 6 }
  r-grid > r-cell[span-s$="+7"], r-grid > r-cell[span-s$="-6"], r-grid > r-cell[span-s="7"] { --grid-ce: 7 }
  r-grid > r-cell[span-s$="+8"], r-grid > r-cell[span-s$="-7"], r-grid > r-cell[span-s="8"] { --grid-ce: 8 }
  r-grid > r-cell[span-s$="+9"], r-grid > r-cell[span-s$="-8"], r-grid > r-cell[span-s="9"] { --grid-ce: 9 }
  r-grid > r-cell[span-s$="+10"], r-grid > r-cell[span-s$="-9"], r-grid > r-cell[span-s="10"] { --grid-ce: 10 }
  r-grid > r-cell[span-s$="+11"], r-grid > r-cell[span-s$="-10"], r-grid > r-cell[span-s="11"] { --grid-ce: 11 }
  r-grid > r-cell[span-s$="+12"], r-grid > r-cell[span-s$="-11"], r-grid > r-cell[span-s="12"] { --grid-ce: 12 }
  r-grid > r-cell[span-s$="+13"], r-grid > r-cell[span-s$="-12"], r-grid > r-cell[span-s="13"] { --grid-ce: 13 }
  r-grid > r-cell[span-s$="+14"], r-grid > r-cell[span-s$="-13"], r-grid > r-cell[span-s="14"] { --grid-ce: 14 }
  r-grid > r-cell[span-s$="+15"], r-grid > r-cell[span-s$="-14"], r-grid > r-cell[span-s="15"] { --grid-ce: 15 }
  r-grid > r-cell[span-s$="+16"], r-grid > r-cell[span-s$="-15"], r-grid > r-cell[span-s="16"] { --grid-ce: 16 }
  r-grid > r-cell[span-s$="+17"], r-grid > r-cell[span-s$="-16"], r-grid > r-cell[span-s="17"] { --grid-ce: 17 }
  r-grid > r-cell[span-s$="+18"], r-grid > r-cell[span-s$="-17"], r-grid > r-cell[span-s="18"] { --grid-ce: 18 }
  r-grid > r-cell[span-s$="+19"], r-grid > r-cell[span-s$="-18"], r-grid > r-cell[span-s="19"] { --grid-ce: 19 }
  r-grid > r-cell[span-s$="+20"], r-grid > r-cell[span-s$="-19"], r-grid > r-cell[span-s="20"] { --grid-ce: 20 }
  r-grid > r-cell[span-s$="+21"], r-grid > r-cell[span-s$="-20"], r-grid > r-cell[span-s="21"] { --grid-ce: 21 }
  r-grid > r-cell[span-s$="+22"], r-grid > r-cell[span-s$="-21"], r-grid > r-cell[span-s="22"] { --grid-ce: 22 }
  r-grid > r-cell[span-s$="+23"], r-grid > r-cell[span-s$="-22"], r-grid > r-cell[span-s="23"] { --grid-ce: 23 }
  r-grid > r-cell[span-s$="+24"], r-grid > r-cell[span-s$="-23"], r-grid > r-cell[span-s="24"] { --grid-ce: 24 }
  r-grid > r-cell[span-s$="-24"] { --grid-ce: 25 }

  /* connect vars */
  r-grid > r-cell[span-s] { grid-column-end: span var(--grid-ce) }
  r-grid > r-cell[span-s*="+"], r-grid > r-cell[span-s*="-"], r-grid > r-cell[span-s*=".."] {
    grid-column-start: var(--grid-cs) }
  r-grid > r-cell[span-s*="-"], r-grid > r-cell[span-s*=".."] {
    grid-column-end: var(--grid-ce) }
  r-grid > r-cell[span-s="row"] { grid-column: 1 / -1 }
}

/* for window width >= 1200 */
@media only screen and (min-width: 1199px) {
  r-grid[columns-l="1"] { --grid-tc: repeat(1, 1fr) }
  r-grid[columns-l="2"] { --grid-tc: repeat(2, 1fr) }
  r-grid[columns-l="3"] { --grid-tc: repeat(3, 1fr) }
  r-grid[columns-l="4"] { --grid-tc: repeat(4, 1fr) }
  r-grid[columns-l="5"] { --grid-tc: repeat(5, 1fr) }
  r-grid[columns-l="6"] { --grid-tc: repeat(6, 1fr) }
  r-grid[columns-l="7"] { --grid-tc: repeat(7, 1fr) }
  r-grid[columns-l="8"] { --grid-tc: repeat(8, 1fr) }
  r-grid[columns-l="9"] { --grid-tc: repeat(9, 1fr) }
  r-grid[columns-l="10"] { --grid-tc: repeat(10, 1fr) }
  r-grid[columns-l="11"] { --grid-tc: repeat(11, 1fr) }
  r-grid[columns-l="12"] { --grid-tc: repeat(12, 1fr) }
  r-grid[columns-l="13"] { --grid-tc: repeat(13, 1fr) }
  r-grid[columns-l="14"] { --grid-tc: repeat(14, 1fr) }
  r-grid[columns-l="15"] { --grid-tc: repeat(15, 1fr) }
  r-grid[columns-l="16"] { --grid-tc: repeat(16, 1fr) }
  r-grid[columns-l="17"] { --grid-tc: repeat(17, 1fr) }
  r-grid[columns-l="18"] { --grid-tc: repeat(18, 1fr) }
  r-grid[columns-l="19"] { --grid-tc: repeat(19, 1fr) }
  r-grid[columns-l="20"] { --grid-tc: repeat(20, 1fr) }
  r-grid[columns-l="21"] { --grid-tc: repeat(21, 1fr) }
  r-grid[columns-l="22"] { --grid-tc: repeat(22, 1fr) }
  r-grid[columns-l="23"] { --grid-tc: repeat(23, 1fr) }
  r-grid[columns-l="24"] { --grid-tc: repeat(24, 1fr) }

  /* span-l=start... */
  r-grid > r-cell[span-l^="1"] { --grid-cs: 1 }
  r-grid > r-cell[span-l^="2"] { --grid-cs: 2 }
  r-grid > r-cell[span-l^="3"] { --grid-cs: 3 }
  r-grid > r-cell[span-l^="4"] { --grid-cs: 4 }
  r-grid > r-cell[span-l^="5"] { --grid-cs: 5 }
  r-grid > r-cell[span-l^="6"] { --grid-cs: 6 }
  r-grid > r-cell[span-l^="7"] { --grid-cs: 7 }
  r-grid > r-cell[span-l^="8"] { --grid-cs: 8 }
  r-grid > r-cell[span-l^="9"] { --grid-cs: 9 }
  r-grid > r-cell[span-l^="10"] { --grid-cs: 10 }
  r-grid > r-cell[span-l^="11"] { --grid-cs: 11 }
  r-grid > r-cell[span-l^="12"] { --grid-cs: 12 }
  r-grid > r-cell[span-l^="13"] { --grid-cs: 13 }
  r-grid > r-cell[span-l^="14"] { --grid-cs: 14 }
  r-grid > r-cell[span-l^="15"] { --grid-cs: 15 }
  r-grid > r-cell[span-l^="16"] { --grid-cs: 16 }
  r-grid > r-cell[span-l^="17"] { --grid-cs: 17 }
  r-grid > r-cell[span-l^="18"] { --grid-cs: 18 }
  r-grid > r-cell[span-l^="19"] { --grid-cs: 19 }
  r-grid > r-cell[span-l^="20"] { --grid-cs: 20 }
  r-grid > r-cell[span-l^="21"] { --grid-cs: 21 }
  r-grid > r-cell[span-l^="22"] { --grid-cs: 22 }
  r-grid > r-cell[span-l^="23"] { --grid-cs: 23 }
  r-grid > r-cell[span-l^="24"] { --grid-cs: 24 }

  /* span-l=...+width, span-l=...-end */
  r-grid > r-cell[span-l$="+1"], r-grid > r-cell[span-l="1"] { --grid-ce: 1 }
  r-grid > r-cell[span-l$="+2"], r-grid > r-cell[span-l$="-1"], r-grid > r-cell[span-l="2"] { --grid-ce: 2 }
  r-grid > r-cell[span-l$="+3"], r-grid > r-cell[span-l$="-2"], r-grid > r-cell[span-l="3"] { --grid-ce: 3 }
  r-grid > r-cell[span-l$="+4"], r-grid > r-cell[span-l$="-3"], r-grid > r-cell[span-l="4"] { --grid-ce: 4 }
  r-grid > r-cell[span-l$="+5"], r-grid > r-cell[span-l$="-4"], r-grid > r-cell[span-l="5"] { --grid-ce: 5 }
  r-grid > r-cell[span-l$="+6"], r-grid > r-cell[span-l$="-5"], r-grid > r-cell[span-l="6"] { --grid-ce: 6 }
  r-grid > r-cell[span-l$="+7"], r-grid > r-cell[span-l$="-6"], r-grid > r-cell[span-l="7"] { --grid-ce: 7 }
  r-grid > r-cell[span-l$="+8"], r-grid > r-cell[span-l$="-7"], r-grid > r-cell[span-l="8"] { --grid-ce: 8 }
  r-grid > r-cell[span-l$="+9"], r-grid > r-cell[span-l$="-8"], r-grid > r-cell[span-l="9"] { --grid-ce: 9 }
  r-grid > r-cell[span-l$="+10"], r-grid > r-cell[span-l$="-9"], r-grid > r-cell[span-l="10"] { --grid-ce: 10 }
  r-grid > r-cell[span-l$="+11"], r-grid > r-cell[span-l$="-10"], r-grid > r-cell[span-l="11"] { --grid-ce: 11 }
  r-grid > r-cell[span-l$="+12"], r-grid > r-cell[span-l$="-11"], r-grid > r-cell[span-l="12"] { --grid-ce: 12 }
  r-grid > r-cell[span-l$="+13"], r-grid > r-cell[span-l$="-12"], r-grid > r-cell[span-l="13"] { --grid-ce: 13 }
  r-grid > r-cell[span-l$="+14"], r-grid > r-cell[span-l$="-13"], r-grid > r-cell[span-l="14"] { --grid-ce: 14 }
  r-grid > r-cell[span-l$="+15"], r-grid > r-cell[span-l$="-14"], r-grid > r-cell[span-l="15"] { --grid-ce: 15 }
  r-grid > r-cell[span-l$="+16"], r-grid > r-cell[span-l$="-15"], r-grid > r-cell[span-l="16"] { --grid-ce: 16 }
  r-grid > r-cell[span-l$="+17"], r-grid > r-cell[span-l$="-16"], r-grid > r-cell[span-l="17"] { --grid-ce: 17 }
  r-grid > r-cell[span-l$="+18"], r-grid > r-cell[span-l$="-17"], r-grid > r-cell[span-l="18"] { --grid-ce: 18 }
  r-grid > r-cell[span-l$="+19"], r-grid > r-cell[span-l$="-18"], r-grid > r-cell[span-l="19"] { --grid-ce: 19 }
  r-grid > r-cell[span-l$="+20"], r-grid > r-cell[span-l$="-19"], r-grid > r-cell[span-l="20"] { --grid-ce: 20 }
  r-grid > r-cell[span-l$="+21"], r-grid > r-cell[span-l$="-20"], r-grid > r-cell[span-l="21"] { --grid-ce: 21 }
  r-grid > r-cell[span-l$="+22"], r-grid > r-cell[span-l$="-21"], r-grid > r-cell[span-l="22"] { --grid-ce: 22 }
  r-grid > r-cell[span-l$="+23"], r-grid > r-cell[span-l$="-22"], r-grid > r-cell[span-l="23"] { --grid-ce: 23 }
  r-grid > r-cell[span-l$="+24"], r-grid > r-cell[span-l$="-23"], r-grid > r-cell[span-l="24"] { --grid-ce: 24 }
  r-grid > r-cell[span-l$="-24"] { --grid-ce: 25 }

  /* connect vars */
  r-grid > r-cell[span-l] { grid-column-end: span var(--grid-ce) }
  r-grid > r-cell[span-l*="+"], r-grid > r-cell[span-l*="-"], r-grid > r-cell[span-l*=".."] {
    grid-column-start: var(--grid-cs) }
  r-grid > r-cell[span-l*="-"], r-grid > r-cell[span-l*=".."] {
    grid-column-end: var(--grid-ce) }
  r-grid > r-cell[span-l="row"] { grid-column: 1 / -1 }
}


/* for window width >= 1600 */
@media only screen and (min-width: 1600px) {
  r-grid[columns-xl="1"] { --grid-tc: repeat(1, 1fr) }
  r-grid[columns-xl="2"] { --grid-tc: repeat(2, 1fr) }
  r-grid[columns-xl="3"] { --grid-tc: repeat(3, 1fr) }
  r-grid[columns-xl="4"] { --grid-tc: repeat(4, 1fr) }
  r-grid[columns-xl="5"] { --grid-tc: repeat(5, 1fr) }
  r-grid[columns-xl="6"] { --grid-tc: repeat(6, 1fr) }
  r-grid[columns-xl="7"] { --grid-tc: repeat(7, 1fr) }
  r-grid[columns-xl="8"] { --grid-tc: repeat(8, 1fr) }
  r-grid[columns-xl="9"] { --grid-tc: repeat(9, 1fr) }
  r-grid[columns-xl="10"] { --grid-tc: repeat(10, 1fr) }
  r-grid[columns-xl="11"] { --grid-tc: repeat(11, 1fr) }
  r-grid[columns-xl="12"] { --grid-tc: repeat(12, 1fr) }
  r-grid[columns-xl="13"] { --grid-tc: repeat(13, 1fr) }
  r-grid[columns-xl="14"] { --grid-tc: repeat(14, 1fr) }
  r-grid[columns-xl="15"] { --grid-tc: repeat(15, 1fr) }
  r-grid[columns-xl="16"] { --grid-tc: repeat(16, 1fr) }
  r-grid[columns-xl="17"] { --grid-tc: repeat(17, 1fr) }
  r-grid[columns-xl="18"] { --grid-tc: repeat(18, 1fr) }
  r-grid[columns-xl="19"] { --grid-tc: repeat(19, 1fr) }
  r-grid[columns-xl="20"] { --grid-tc: repeat(20, 1fr) }
  r-grid[columns-xl="21"] { --grid-tc: repeat(21, 1fr) }
  r-grid[columns-xl="22"] { --grid-tc: repeat(22, 1fr) }
  r-grid[columns-xl="23"] { --grid-tc: repeat(23, 1fr) }
  r-grid[columns-xl="24"] { --grid-tc: repeat(24, 1fr) }

  /* span-l=start... */
  r-grid > r-cell[span-xl^="1"] { --grid-cs: 1 }
  r-grid > r-cell[span-xl^="2"] { --grid-cs: 2 }
  r-grid > r-cell[span-xl^="3"] { --grid-cs: 3 }
  r-grid > r-cell[span-xl^="4"] { --grid-cs: 4 }
  r-grid > r-cell[span-xl^="5"] { --grid-cs: 5 }
  r-grid > r-cell[span-xl^="6"] { --grid-cs: 6 }
  r-grid > r-cell[span-xl^="7"] { --grid-cs: 7 }
  r-grid > r-cell[span-xl^="8"] { --grid-cs: 8 }
  r-grid > r-cell[span-xl^="9"] { --grid-cs: 9 }
  r-grid > r-cell[span-xl^="10"] { --grid-cs: 10 }
  r-grid > r-cell[span-xl^="11"] { --grid-cs: 11 }
  r-grid > r-cell[span-xl^="12"] { --grid-cs: 12 }
  r-grid > r-cell[span-xl^="13"] { --grid-cs: 13 }
  r-grid > r-cell[span-xl^="14"] { --grid-cs: 14 }
  r-grid > r-cell[span-xl^="15"] { --grid-cs: 15 }
  r-grid > r-cell[span-xl^="16"] { --grid-cs: 16 }
  r-grid > r-cell[span-xl^="17"] { --grid-cs: 17 }
  r-grid > r-cell[span-xl^="18"] { --grid-cs: 18 }
  r-grid > r-cell[span-xl^="19"] { --grid-cs: 19 }
  r-grid > r-cell[span-xl^="20"] { --grid-cs: 20 }
  r-grid > r-cell[span-xl^="21"] { --grid-cs: 21 }
  r-grid > r-cell[span-xl^="22"] { --grid-cs: 22 }
  r-grid > r-cell[span-xl^="23"] { --grid-cs: 23 }
  r-grid > r-cell[span-xl^="24"] { --grid-cs: 24 }

  /* span-xl=...+width, span-xl=...-end */
  r-grid > r-cell[span-xl$="+1"], r-grid > r-cell[span-xl="1"] { --grid-ce: 1 }
  r-grid > r-cell[span-xl$="+2"], r-grid > r-cell[span-xl$="-1"], r-grid > r-cell[span-xl="2"] { --grid-ce: 2 }
  r-grid > r-cell[span-xl$="+3"], r-grid > r-cell[span-xl$="-2"], r-grid > r-cell[span-xl="3"] { --grid-ce: 3 }
  r-grid > r-cell[span-xl$="+4"], r-grid > r-cell[span-xl$="-3"], r-grid > r-cell[span-xl="4"] { --grid-ce: 4 }
  r-grid > r-cell[span-xl$="+5"], r-grid > r-cell[span-xl$="-4"], r-grid > r-cell[span-xl="5"] { --grid-ce: 5 }
  r-grid > r-cell[span-xl$="+6"], r-grid > r-cell[span-xl$="-5"], r-grid > r-cell[span-xl="6"] { --grid-ce: 6 }
  r-grid > r-cell[span-xl$="+7"], r-grid > r-cell[span-xl$="-6"], r-grid > r-cell[span-xl="7"] { --grid-ce: 7 }
  r-grid > r-cell[span-xl$="+8"], r-grid > r-cell[span-xl$="-7"], r-grid > r-cell[span-xl="8"] { --grid-ce: 8 }
  r-grid > r-cell[span-xl$="+9"], r-grid > r-cell[span-xl$="-8"], r-grid > r-cell[span-xl="9"] { --grid-ce: 9 }
  r-grid > r-cell[span-xl$="+10"], r-grid > r-cell[span-xl$="-9"], r-grid > r-cell[span-xl="10"] { --grid-ce: 10 }
  r-grid > r-cell[span-xl$="+11"], r-grid > r-cell[span-xl$="-10"], r-grid > r-cell[span-xl="11"] { --grid-ce: 11 }
  r-grid > r-cell[span-xl$="+12"], r-grid > r-cell[span-xl$="-11"], r-grid > r-cell[span-xl="12"] { --grid-ce: 12 }
  r-grid > r-cell[span-xl$="+13"], r-grid > r-cell[span-xl$="-12"], r-grid > r-cell[span-xl="13"] { --grid-ce: 13 }
  r-grid > r-cell[span-xl$="+14"], r-grid > r-cell[span-xl$="-13"], r-grid > r-cell[span-xl="14"] { --grid-ce: 14 }
  r-grid > r-cell[span-xl$="+15"], r-grid > r-cell[span-xl$="-14"], r-grid > r-cell[span-xl="15"] { --grid-ce: 15 }
  r-grid > r-cell[span-xl$="+16"], r-grid > r-cell[span-xl$="-15"], r-grid > r-cell[span-xl="16"] { --grid-ce: 16 }
  r-grid > r-cell[span-xl$="+17"], r-grid > r-cell[span-xl$="-16"], r-grid > r-cell[span-xl="17"] { --grid-ce: 17 }
  r-grid > r-cell[span-xl$="+18"], r-grid > r-cell[span-xl$="-17"], r-grid > r-cell[span-xl="18"] { --grid-ce: 18 }
  r-grid > r-cell[span-xl$="+19"], r-grid > r-cell[span-xl$="-18"], r-grid > r-cell[span-xl="19"] { --grid-ce: 19 }
  r-grid > r-cell[span-xl$="+20"], r-grid > r-cell[span-xl$="-19"], r-grid > r-cell[span-xl="20"] { --grid-ce: 20 }
  r-grid > r-cell[span-xl$="+21"], r-grid > r-cell[span-xl$="-20"], r-grid > r-cell[span-xl="21"] { --grid-ce: 21 }
  r-grid > r-cell[span-xl$="+22"], r-grid > r-cell[span-xl$="-21"], r-grid > r-cell[span-xl="22"] { --grid-ce: 22 }
  r-grid > r-cell[span-xl$="+23"], r-grid > r-cell[span-xl$="-22"], r-grid > r-cell[span-xl="23"] { --grid-ce: 23 }
  r-grid > r-cell[span-xl$="+24"], r-grid > r-cell[span-xl$="-23"], r-grid > r-cell[span-xl="24"] { --grid-ce: 24 }
  r-grid > r-cell[span-xl$="-24"] { --grid-ce: 25 }

  /* connect vars */
  r-grid > r-cell[span-xl] { grid-column-end: span var(--grid-ce) }
  r-grid > r-cell[span-xl*="+"], r-grid > r-cell[span-xl*="-"], r-grid > r-cell[span-xl*=".."] {
    grid-column-start: var(--grid-cs) }
  r-grid > r-cell[span-xl*="-"], r-grid > r-cell[span-xl*=".."] {
    grid-column-end: var(--grid-ce) }
  r-grid > r-cell[span-xl="row"] { grid-column: 1 / -1 }
}


/* for window width >= 2500 */
@media only screen and (min-width: 2499px) {
  r-grid[columns-xxl="1"] { --grid-tc: repeat(1, 1fr) }
  r-grid[columns-xxl="2"] { --grid-tc: repeat(2, 1fr) }
  r-grid[columns-xxl="3"] { --grid-tc: repeat(3, 1fr) }
  r-grid[columns-xxl="4"] { --grid-tc: repeat(4, 1fr) }
  r-grid[columns-xxl="5"] { --grid-tc: repeat(5, 1fr) }
  r-grid[columns-xxl="6"] { --grid-tc: repeat(6, 1fr) }
  r-grid[columns-xxl="7"] { --grid-tc: repeat(7, 1fr) }
  r-grid[columns-xxl="8"] { --grid-tc: repeat(8, 1fr) }
  r-grid[columns-xxl="9"] { --grid-tc: repeat(9, 1fr) }
  r-grid[columns-xxl="10"] { --grid-tc: repeat(10, 1fr) }
  r-grid[columns-xxl="11"] { --grid-tc: repeat(11, 1fr) }
  r-grid[columns-xxl="12"] { --grid-tc: repeat(12, 1fr) }
  r-grid[columns-xxl="13"] { --grid-tc: repeat(13, 1fr) }
  r-grid[columns-xxl="14"] { --grid-tc: repeat(14, 1fr) }
  r-grid[columns-xxl="15"] { --grid-tc: repeat(15, 1fr) }
  r-grid[columns-xxl="16"] { --grid-tc: repeat(16, 1fr) }
  r-grid[columns-xxl="17"] { --grid-tc: repeat(17, 1fr) }
  r-grid[columns-xxl="18"] { --grid-tc: repeat(18, 1fr) }
  r-grid[columns-xxl="19"] { --grid-tc: repeat(19, 1fr) }
  r-grid[columns-xxl="20"] { --grid-tc: repeat(20, 1fr) }
  r-grid[columns-xxl="21"] { --grid-tc: repeat(21, 1fr) }
  r-grid[columns-xxl="22"] { --grid-tc: repeat(22, 1fr) }
  r-grid[columns-xxl="23"] { --grid-tc: repeat(23, 1fr) }
  r-grid[columns-xxl="24"] { --grid-tc: repeat(24, 1fr) }

  /* span-xl=start... */
  r-grid > r-cell[span-xxl^="1"] { --grid-cs: 1 }
  r-grid > r-cell[span-xxl^="2"] { --grid-cs: 2 }
  r-grid > r-cell[span-xxl^="3"] { --grid-cs: 3 }
  r-grid > r-cell[span-xxl^="4"] { --grid-cs: 4 }
  r-grid > r-cell[span-xxl^="5"] { --grid-cs: 5 }
  r-grid > r-cell[span-xxl^="6"] { --grid-cs: 6 }
  r-grid > r-cell[span-xxl^="7"] { --grid-cs: 7 }
  r-grid > r-cell[span-xxl^="8"] { --grid-cs: 8 }
  r-grid > r-cell[span-xxl^="9"] { --grid-cs: 9 }
  r-grid > r-cell[span-xxl^="10"] { --grid-cs: 10 }
  r-grid > r-cell[span-xxl^="11"] { --grid-cs: 11 }
  r-grid > r-cell[span-xxl^="12"] { --grid-cs: 12 }
  r-grid > r-cell[span-xxl^="13"] { --grid-cs: 13 }
  r-grid > r-cell[span-xxl^="14"] { --grid-cs: 14 }
  r-grid > r-cell[span-xxl^="15"] { --grid-cs: 15 }
  r-grid > r-cell[span-xxl^="16"] { --grid-cs: 16 }
  r-grid > r-cell[span-xxl^="17"] { --grid-cs: 17 }
  r-grid > r-cell[span-xxl^="18"] { --grid-cs: 18 }
  r-grid > r-cell[span-xxl^="19"] { --grid-cs: 19 }
  r-grid > r-cell[span-xxl^="20"] { --grid-cs: 20 }
  r-grid > r-cell[span-xxl^="21"] { --grid-cs: 21 }
  r-grid > r-cell[span-xxl^="22"] { --grid-cs: 22 }
  r-grid > r-cell[span-xxl^="23"] { --grid-cs: 23 }
  r-grid > r-cell[span-xxl^="24"] { --grid-cs: 24 }

  /* span-xxl=...+width, span-xxl=...-end */
  r-grid > r-cell[span-xxl$="+1"], r-grid > r-cell[span-xxl="1"] { --grid-ce: 1 }
  r-grid > r-cell[span-xxl$="+2"], r-grid > r-cell[span-xxl$="-1"], r-grid > r-cell[span-xxl="2"] { --grid-ce: 2 }
  r-grid > r-cell[span-xxl$="+3"], r-grid > r-cell[span-xxl$="-2"], r-grid > r-cell[span-xxl="3"] { --grid-ce: 3 }
  r-grid > r-cell[span-xxl$="+4"], r-grid > r-cell[span-xxl$="-3"], r-grid > r-cell[span-xxl="4"] { --grid-ce: 4 }
  r-grid > r-cell[span-xxl$="+5"], r-grid > r-cell[span-xxl$="-4"], r-grid > r-cell[span-xxl="5"] { --grid-ce: 5 }
  r-grid > r-cell[span-xxl$="+6"], r-grid > r-cell[span-xxl$="-5"], r-grid > r-cell[span-xxl="6"] { --grid-ce: 6 }
  r-grid > r-cell[span-xxl$="+7"], r-grid > r-cell[span-xxl$="-6"], r-grid > r-cell[span-xxl="7"] { --grid-ce: 7 }
  r-grid > r-cell[span-xxl$="+8"], r-grid > r-cell[span-xxl$="-7"], r-grid > r-cell[span-xxl="8"] { --grid-ce: 8 }
  r-grid > r-cell[span-xxl$="+9"], r-grid > r-cell[span-xxl$="-8"], r-grid > r-cell[span-xxl="9"] { --grid-ce: 9 }
  r-grid > r-cell[span-xxl$="+10"], r-grid > r-cell[span-xxl$="-9"], r-grid > r-cell[span-xxl="10"] { --grid-ce: 10 }
  r-grid > r-cell[span-xxl$="+11"], r-grid > r-cell[span-xxl$="-10"], r-grid > r-cell[span-xxl="11"] { --grid-ce: 11 }
  r-grid > r-cell[span-xxl$="+12"], r-grid > r-cell[span-xxl$="-11"], r-grid > r-cell[span-xxl="12"] { --grid-ce: 12 }
  r-grid > r-cell[span-xxl$="+13"], r-grid > r-cell[span-xxl$="-12"], r-grid > r-cell[span-xxl="13"] { --grid-ce: 13 }
  r-grid > r-cell[span-xxl$="+14"], r-grid > r-cell[span-xxl$="-13"], r-grid > r-cell[span-xxl="14"] { --grid-ce: 14 }
  r-grid > r-cell[span-xxl$="+15"], r-grid > r-cell[span-xxl$="-14"], r-grid > r-cell[span-xxl="15"] { --grid-ce: 15 }
  r-grid > r-cell[span-xxl$="+16"], r-grid > r-cell[span-xxl$="-15"], r-grid > r-cell[span-xxl="16"] { --grid-ce: 16 }
  r-grid > r-cell[span-xxl$="+17"], r-grid > r-cell[span-xxl$="-16"], r-grid > r-cell[span-xxl="17"] { --grid-ce: 17 }
  r-grid > r-cell[span-xxl$="+18"], r-grid > r-cell[span-xxl$="-17"], r-grid > r-cell[span-xxl="18"] { --grid-ce: 18 }
  r-grid > r-cell[span-xxl$="+19"], r-grid > r-cell[span-xxl$="-18"], r-grid > r-cell[span-xxl="19"] { --grid-ce: 19 }
  r-grid > r-cell[span-xxl$="+20"], r-grid > r-cell[span-xxl$="-19"], r-grid > r-cell[span-xxl="20"] { --grid-ce: 20 }
  r-grid > r-cell[span-xxl$="+21"], r-grid > r-cell[span-xxl$="-20"], r-grid > r-cell[span-xxl="21"] { --grid-ce: 21 }
  r-grid > r-cell[span-xxl$="+22"], r-grid > r-cell[span-xxl$="-21"], r-grid > r-cell[span-xxl="22"] { --grid-ce: 22 }
  r-grid > r-cell[span-xxl$="+23"], r-grid > r-cell[span-xxl$="-22"], r-grid > r-cell[span-xxl="23"] { --grid-ce: 23 }
  r-grid > r-cell[span-xxl$="+24"], r-grid > r-cell[span-xxl$="-23"], r-grid > r-cell[span-xxl="24"] { --grid-ce: 24 }
  r-grid > r-cell[span-xxl$="-24"] { --grid-ce: 25 }

  /* connect vars */
  r-grid > r-cell[span-xxl] { grid-column-end: span var(--grid-ce) }
  r-grid > r-cell[span-xxl*="+"], r-grid > r-cell[span-xxl*="-"], r-grid > r-cell[span-xxl*=".."] {
    grid-column-start: var(--grid-cs) }
  r-grid > r-cell[span-xxl*="-"], r-grid > r-cell[span-xxl*=".."] {
    grid-column-end: var(--grid-ce) }
  r-grid > r-cell[span-xxl="row"] { grid-column: 1 / -1 }
}

/* .debug can be added to a r-grid to visualize its effective cells */
r-grid.debug > * {
  --color: rgba(248,110,91 ,0.3);
  background-image:
    linear-gradient(to bottom, var(--color) 0%, var(--color) 100%);
}
r-grid.debug > :nth-child(6n+2) { --color: rgba(103,126,208,0.3) }
r-grid.debug > :nth-child(6n+3) { --color: rgba(224,174,72 ,0.3) }
r-grid.debug > :nth-child(6n+4) { --color: rgba(77, 214,115,0.3) }
r-grid.debug > :nth-child(6n+5) { --color: rgba(217,103,219,0.3) }
r-grid.debug > :nth-child(6n+6) { --color: rgba(94, 204,211,0.3) }
r-grid.debug > :nth-child(6n+7) { --color: rgba(248,110,91 ,0.3) }