/* 桌面壁纸 · 星空（系统设置 → 外观与桌面 → 壁纸，第 4 个选项）
   ---------------------------------------------------------------------------
   三层星点各自匀速上升，速度不同（50s / 100s / 150s）→ 看起来有远近。
   每层用 ::after 在下方 2000px 处复制一份同样的星点，循环到头时不会出现空档。
   星点坐标是生成出来的数据（2000×2000 的场，固定随机种子），不要手改；
   想调密度就改生成脚本里的数量，想调快慢就改 --dur。全程纯 CSS，不用脚本。
   --------------------------------------------------------------------------- */
.dk[data-wall="star"] .dk__bg { background: radial-gradient(ellipse at bottom, #321b35 0%, #090a0f 100%); }
/* 原来那张壁纸底部压暗 58% 是为了山坡和水面，星空上会把紫色地平线糊掉 */
.dk[data-wall="star"] .dk__bg::before { background: none; }
/* 天太黑，噪点颗粒在星空上会像屏幕脏了，留一点点质感就够 */
.dk[data-wall="star"] .dk__grain { opacity: .1; }

.dk-stars { display: none; position: absolute; inset: 0; overflow: hidden; pointer-events: none; }
.dk[data-wall="star"] .dk-stars { display: block; }
.dk-stars i { position: absolute; left: 0; top: 0; border-radius: 50%; background: transparent;
  box-shadow: var(--st); animation: dkStarUp var(--dur) linear infinite; }
.dk-stars i::after { content: ""; position: absolute; left: 0; top: 2000px; width: inherit; height: inherit;
  border-radius: 50%; background: transparent; box-shadow: var(--st); }

.dk-stars i:nth-child(1) { --dur: 50s; width: 1px; height: 1px; opacity: .8;
  --st: 33px 1680px #fff, 1925px 1355px #fff, 1873px 1121px #fff,
    1294px 1438px #fff, 299px 1146px #fff, 1166px 1611px #fff,
    1492px 1671px #fff, 119px 1737px #fff, 875px 571px #fff,
    755px 1564px #fff, 1335px 909px #fff, 1541px 1105px #fff,
    1910px 684px #fff, 1925px 708px #fff, 906px 1108px #fff,
    502px 1476px #fff, 121px 542px #fff, 424px 546px #fff,
    1722px 75px #fff, 179px 1216px #fff, 758px 1604px #fff,
    965px 1831px #fff, 1551px 666px #fff, 156px 524px #fff,
    951px 452px #fff, 1030px 1226px #fff, 1013px 1742px #fff,
    942px 1816px #fff, 929px 888px #fff, 1974px 1909px #fff,
    915px 1994px #fff, 569px 81px #fff, 1674px 1741px #fff,
    1145px 343px #fff, 1126px 805px #fff, 1344px 1494px #fff,
    1239px 846px #fff, 243px 1033px #fff, 562px 1674px #fff,
    355px 935px #fff, 1653px 1059px #fff, 1181px 863px #fff,
    1041px 493px #fff, 1732px 243px #fff, 1507px 48px #fff,
    1000px 458px #fff, 1610px 1212px #fff, 1925px 599px #fff,
    851px 218px #fff, 263px 909px #fff, 284px 51px #fff,
    29px 637px #fff, 837px 390px #fff, 775px 1138px #fff,
    1296px 1254px #fff, 1955px 718px #fff, 1864px 1185px #fff,
    995px 449px #fff, 1702px 1007px #fff, 1649px 451px #fff,
    766px 125px #fff, 1943px 1319px #fff, 1537px 1088px #fff,
    1826px 630px #fff, 773px 1178px #fff, 44px 225px #fff,
    1635px 1247px #fff, 1457px 510px #fff, 1001px 646px #fff,
    1544px 1430px #fff, 1499px 1412px #fff, 820px 762px #fff,
    1039px 2px #fff, 311px 608px #fff, 46px 198px #fff,
    1404px 598px #fff, 1242px 433px #fff, 1909px 1335px #fff,
    1456px 228px #fff, 1055px 1509px #fff, 274px 125px #fff,
    1246px 1129px #fff, 1290px 56px #fff, 621px 1360px #fff,
    712px 1630px #fff, 151px 1380px #fff, 84px 1029px #fff,
    184px 446px #fff, 1211px 1371px #fff, 533px 1151px #fff,
    389px 214px #fff, 164px 1553px #fff, 1956px 1895px #fff,
    1837px 1082px #fff, 1213px 118px #fff, 1032px 594px #fff,
    1933px 24px #fff, 719px 1554px #fff, 1002px 779px #fff,
    223px 927px #fff, 1514px 890px #fff, 887px 1822px #fff,
    1852px 793px #fff, 739px 1286px #fff, 1012px 340px #fff,
    1482px 924px #fff, 116px 792px #fff, 663px 487px #fff,
    1862px 571px #fff, 696px 1865px #fff, 255px 1325px #fff,
    942px 316px #fff, 1872px 1800px #fff, 193px 323px #fff,
    1004px 1499px #fff, 1171px 1220px #fff, 174px 523px #fff,
    1847px 1722px #fff, 886px 1160px #fff, 590px 623px #fff,
    838px 650px #fff, 346px 31px #fff, 38px 1179px #fff,
    1731px 29px #fff, 287px 1301px #fff, 1884px 1260px #fff,
    1174px 395px #fff, 207px 1197px #fff, 657px 780px #fff,
    849px 1697px #fff, 1449px 577px #fff, 888px 128px #fff,
    343px 412px #fff, 476px 741px #fff, 392px 1959px #fff,
    973px 1849px #fff, 856px 1873px #fff, 1118px 1179px #fff,
    464px 143px #fff, 896px 492px #fff, 151px 656px #fff,
    1422px 680px #fff, 461px 1566px #fff, 1469px 1819px #fff,
    209px 1199px #fff, 1012px 1907px #fff, 753px 1779px #fff,
    1848px 1979px #fff, 1369px 858px #fff, 693px 1902px #fff,
    1368px 948px #fff, 394px 435px #fff, 490px 1758px #fff,
    1103px 1642px #fff, 162px 1862px #fff, 1095px 241px #fff,
    834px 1752px #fff, 1297px 1388px #fff, 1471px 1704px #fff,
    8px 1084px #fff, 1934px 1224px #fff, 615px 1447px #fff,
    1920px 1822px #fff, 939px 1773px #fff, 1568px 90px #fff,
    1988px 340px #fff, 698px 1314px #fff, 998px 1993px #fff,
    797px 49px #fff, 643px 1059px #fff, 331px 1291px #fff,
    1058px 1398px #fff, 1242px 1715px #fff, 1338px 160px #fff,
    1918px 213px #fff, 1408px 1077px #fff, 1500px 886px #fff,
    32px 211px #fff, 1457px 1865px #fff, 876px 1788px #fff,
    269px 1499px #fff, 350px 1024px #fff, 1178px 935px #fff,
    1113px 840px #fff, 1821px 1956px #fff, 997px 363px #fff,
    1810px 1432px #fff, 1063px 1382px #fff, 2px 322px #fff,
    1031px 1371px #fff, 1015px 790px #fff, 646px 638px #fff,
    187px 1686px #fff, 388px 465px #fff, 1200px 396px #fff,
    45px 1986px #fff, 831px 748px #fff, 1752px 1046px #fff,
    1776px 665px #fff, 107px 155px #fff;
}
.dk-stars i:nth-child(2) { --dur: 100s; width: 2px; height: 2px; opacity: .9;
  --st: 762px 530px #fff, 1663px 1039px #fff, 151px 966px #fff,
    178px 479px #fff, 911px 578px #fff, 239px 462px #fff,
    753px 362px #fff, 159px 1765px #fff, 1534px 93px #fff,
    547px 925px #fff, 1793px 373px #fff, 85px 1292px #fff,
    1423px 306px #fff, 871px 123px #fff, 1661px 878px #fff,
    893px 1689px #fff, 1243px 618px #fff, 740px 1477px #fff,
    1504px 966px #fff, 131px 972px #fff, 153px 26px #fff,
    1501px 1409px #fff, 1615px 1366px #fff, 1756px 1649px #fff,
    715px 1295px #fff, 29px 773px #fff, 685px 491px #fff,
    1018px 106px #fff, 319px 791px #fff, 659px 1182px #fff,
    1986px 1702px #fff, 1302px 408px #fff, 1143px 1351px #fff,
    694px 1279px #fff, 264px 1463px #fff, 1309px 1855px #fff,
    63px 307px #fff, 1857px 603px #fff, 647px 33px #fff,
    592px 1322px #fff, 348px 449px #fff, 1557px 1285px #fff,
    1427px 1503px #fff, 338px 1436px #fff, 594px 1651px #fff,
    1249px 1003px #fff, 927px 1327px #fff, 985px 929px #fff,
    1698px 665px #fff, 525px 823px #fff, 1362px 1930px #fff,
    406px 340px #fff, 432px 1967px #fff, 8px 1619px #fff,
    6px 590px #fff, 1279px 494px #fff, 1767px 1309px #fff,
    991px 26px #fff, 591px 825px #fff, 1035px 1739px #fff,
    1399px 736px #fff, 123px 1695px #fff, 707px 1674px #fff,
    450px 263px #fff, 1847px 1597px #fff, 738px 977px #fff,
    440px 1609px #fff, 1877px 586px #fff, 1414px 748px #fff,
    636px 1573px #fff, 14px 794px #fff, 1655px 1274px #fff,
    569px 659px #fff, 294px 1822px #fff, 238px 1977px #fff,
    6px 1426px #fff, 181px 1098px #fff, 1220px 1445px #fff,
    1521px 820px #fff, 1357px 1002px #fff, 815px 646px #fff,
    1102px 1752px #fff, 1609px 1228px #fff, 1718px 1873px #fff,
    130px 1814px #fff, 1335px 1208px #fff, 1033px 228px #fff,
    1371px 1356px #fff, 1123px 351px #fff, 104px 1431px #fff,
    1597px 1603px #fff, 943px 343px #fff, 681px 427px #fff,
    1331px 1896px #fff, 899px 1315px #fff, 789px 1206px #fff,
    546px 611px #fff, 1171px 946px #fff, 179px 26px #fff,
    1710px 1200px #fff, 682px 1054px #fff, 274px 151px #fff,
    917px 506px #fff, 1053px 1488px #fff, 1705px 1664px #fff,
    1366px 1637px #fff, 344px 334px #fff, 1582px 422px #fff,
    1707px 980px #fff, 627px 640px #fff;
}
.dk-stars i:nth-child(3) { --dur: 150s; width: 3px; height: 3px; opacity: .95;
  --st: 275px 1857px #fff, 1528px 1234px #fff, 1786px 1651px #fff,
    46px 142px #fff, 338px 1963px #fff, 1428px 1574px #fff,
    836px 352px #fff, 996px 967px #fff, 1155px 614px #fff,
    1379px 1694px #fff, 612px 1245px #fff, 1691px 1334px #fff,
    721px 1735px #fff, 841px 1354px #fff, 615px 1564px #fff,
    1819px 1759px #fff, 1854px 771px #fff, 764px 227px #fff,
    1161px 1217px #fff, 1544px 971px #fff, 1746px 184px #fff,
    355px 351px #fff, 608px 599px #fff, 44px 1259px #fff,
    489px 1804px #fff, 1024px 1041px #fff, 688px 1656px #fff,
    758px 1377px #fff, 930px 1345px #fff, 1461px 1509px #fff,
    368px 603px #fff, 1855px 1223px #fff, 841px 508px #fff,
    1621px 865px #fff, 1602px 760px #fff, 623px 1159px #fff,
    357px 276px #fff, 1551px 1035px #fff, 1061px 1304px #fff,
    1957px 1847px #fff, 326px 589px #fff, 1317px 1395px #fff,
    1678px 775px #fff, 247px 1922px #fff, 91px 101px #fff,
    252px 1617px #fff, 667px 868px #fff, 691px 146px #fff,
    288px 659px #fff, 859px 873px #fff, 870px 1034px #fff,
    673px 346px #fff, 594px 6px #fff, 1405px 704px #fff,
    1237px 1841px #fff;
}

@keyframes dkStarUp { from { transform: translateY(0); } to { transform: translateY(-2000px); } }
@media (prefers-reduced-motion: reduce) { .dk-stars i { animation: none; } }