:root{--color-text:#17212b;--color-muted:#55626f;--color-bg:#f6f9fc;--color-surface:#eef4f9;--color-border:#d3dde6;--color-accent:#1d5f8f;--color-on-accent:#fff;--nav-band:#0f3a5c;--nav-text:#f6f9fc;--nav-muted:#c5d8e8;--nav-sun:#f2c14e;--max-width:46rem;color-scheme:light dark}:root[data-theme=light]{color-scheme:light}@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--color-text:#e5ecf4;--color-muted:#9fb0c2;--color-bg:#0b1220;--color-surface:#131d2c;--color-border:#27354a;--color-accent:#82c3ea;--color-on-accent:#08131f;--nav-band:#0e2236;--nav-text:#e5ecf4;--nav-muted:#a9c0d6}}:root[data-theme=dark]{--color-text:#e5ecf4;--color-muted:#9fb0c2;--color-bg:#0b1220;--color-surface:#131d2c;--color-border:#27354a;--color-accent:#82c3ea;--color-on-accent:#08131f;--nav-band:#0e2236;--nav-text:#e5ecf4;--nav-muted:#a9c0d6;color-scheme:dark}*,:before,:after{box-sizing:border-box}body{color:var(--color-text);background:var(--color-bg);margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.6}:lang(zh){line-break:strict;font-family:system-ui,-apple-system,Segoe UI,Roboto,PingFang SC,Hiragino Sans GB,Noto Sans CJK SC,Noto Sans SC,Source Han Sans SC,Microsoft YaHei,sans-serif;line-height:1.75}:lang(zh) :is(em,i,cite){font-style:normal}body:before{content:"";z-index:-1;pointer-events:none;background:url("data:image/svg+xml,%3csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20400%20400'%3e%3cdefs%3e%3cradialGradient%20id='glow'%20cx='50%25'%20cy='50%25'%20r='50%25'%3e%3cstop%20offset='0'%20stop-color='%23ffe7a8'%20stop-opacity='0.9'/%3e%3cstop%20offset='0.35'%20stop-color='%23ffd27a'%20stop-opacity='0.35'/%3e%3cstop%20offset='1'%20stop-color='%23ffd27a'%20stop-opacity='0'/%3e%3c/radialGradient%3e%3c/defs%3e%3ccircle%20cx='200'%20cy='200'%20r='200'%20fill='url(%23glow)'/%3e%3ccircle%20cx='200'%20cy='200'%20r='46'%20fill='%23ffd77f'/%3e%3c/svg%3e") right -70px top -60px/340px no-repeat,url("data:image/svg+xml,%3csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%201600%20420'%20preserveAspectRatio='xMidYMax%20slice'%3e%3cg%20fill='%23ffffff'%20opacity='0.8'%3e%3ccircle%20cx='728.7'%20cy='101.8'%20r='2.5'/%3e%3ccircle%20cx='989.6'%20cy='50.3'%20r='1.5'/%3e%3ccircle%20cx='1092.6'%20cy='264.5'%20r='1.6'/%3e%3ccircle%20cx='68.3'%20cy='22'%20r='2.4'/%3e%3ccircle%20cx='622.1'%20cy='37.8'%20r='1.4'/%3e%3ccircle%20cx='529.7'%20cy='134.2'%20r='3'/%3e%3ccircle%20cx='904.1'%20cy='0.6'%20r='1.4'/%3e%3ccircle%20cx='441.8'%20cy='256.8'%20r='3.1'/%3e%3ccircle%20cx='1507.5'%20cy='252.5'%20r='1.6'/%3e%3ccircle%20cx='438.6'%20cy='136.6'%20r='1.6'/%3e%3ccircle%20cx='1062'%20cy='278'%20r='1.7'/%3e%3ccircle%20cx='1469.8'%20cy='26.5'%20r='1.1'/%3e%3ccircle%20cx='536.6'%20cy='255.2'%20r='2.6'/%3e%3ccircle%20cx='631.9'%20cy='319.2'%20r='2.5'/%3e%3ccircle%20cx='1006.7'%20cy='120.5'%20r='1.1'/%3e%3ccircle%20cx='1588.7'%20cy='60.2'%20r='3.1'/%3e%3ccircle%20cx='1329.6'%20cy='90.5'%20r='2.1'/%3e%3ccircle%20cx='283.9'%20cy='322.2'%20r='2.3'/%3e%3ccircle%20cx='1391.5'%20cy='253.3'%20r='2.3'/%3e%3ccircle%20cx='738.8'%20cy='165.6'%20r='2.7'/%3e%3ccircle%20cx='1228.4'%20cy='190.1'%20r='2.5'/%3e%3ccircle%20cx='1549'%20cy='123.2'%20r='1'/%3e%3ccircle%20cx='285.8'%20cy='26.4'%20r='3.1'/%3e%3ccircle%20cx='1483.1'%20cy='57.3'%20r='1.4'/%3e%3ccircle%20cx='776'%20cy='194.3'%20r='1.6'/%3e%3ccircle%20cx='1516.9'%20cy='296.7'%20r='1'/%3e%3ccircle%20cx='1549.6'%20cy='204.4'%20r='2.9'/%3e%3ccircle%20cx='374.3'%20cy='197.4'%20r='2.2'/%3e%3ccircle%20cx='31.3'%20cy='300.6'%20r='2.9'/%3e%3ccircle%20cx='1541.6'%20cy='261.3'%20r='1.1'/%3e%3ccircle%20cx='1525.2'%20cy='308.8'%20r='2'/%3e%3ccircle%20cx='738.1'%20cy='0.3'%20r='1.5'/%3e%3ccircle%20cx='1325.1'%20cy='302.1'%20r='2.2'/%3e%3ccircle%20cx='308.2'%20cy='32.1'%20r='2.1'/%3e%3ccircle%20cx='1588.7'%20cy='277.9'%20r='1.5'/%3e%3ccircle%20cx='514.8'%20cy='234.7'%20r='2.9'/%3e%3ccircle%20cx='310.9'%20cy='198.7'%20r='3.1'/%3e%3ccircle%20cx='78.4'%20cy='182.1'%20r='1.3'/%3e%3ccircle%20cx='1003.9'%20cy='199.7'%20r='1.4'/%3e%3ccircle%20cx='364.9'%20cy='105.8'%20r='1.4'/%3e%3ccircle%20cx='1441.4'%20cy='120.7'%20r='1.1'/%3e%3ccircle%20cx='638.7'%20cy='120.2'%20r='3'/%3e%3ccircle%20cx='1339.5'%20cy='211.2'%20r='2.6'/%3e%3ccircle%20cx='582.1'%20cy='82.2'%20r='2'/%3e%3ccircle%20cx='365.7'%20cy='18.2'%20r='1.2'/%3e%3ccircle%20cx='1533.7'%20cy='45.7'%20r='2.8'/%3e%3ccircle%20cx='1574.9'%20cy='35.9'%20r='1.4'/%3e%3ccircle%20cx='290.9'%20cy='104'%20r='3'/%3e%3ccircle%20cx='140.8'%20cy='92.5'%20r='1.1'/%3e%3ccircle%20cx='944.7'%20cy='190.8'%20r='3.2'/%3e%3ccircle%20cx='580.8'%20cy='169.6'%20r='2.3'/%3e%3ccircle%20cx='1069.2'%20cy='288.9'%20r='2.1'/%3e%3ccircle%20cx='648'%20cy='216.3'%20r='2.6'/%3e%3ccircle%20cx='214.2'%20cy='111'%20r='1.9'/%3e%3ccircle%20cx='679.6'%20cy='40.8'%20r='1.4'/%3e%3ccircle%20cx='552.7'%20cy='23.3'%20r='2'/%3e%3ccircle%20cx='736.5'%20cy='56.4'%20r='1.5'/%3e%3ccircle%20cx='422'%20cy='224'%20r='2.5'/%3e%3ccircle%20cx='503.3'%20cy='35.6'%20r='1.5'/%3e%3ccircle%20cx='1395.3'%20cy='308.8'%20r='2.9'/%3e%3ccircle%20cx='1134.9'%20cy='56'%20r='1.6'/%3e%3ccircle%20cx='631.2'%20cy='327'%20r='2.2'/%3e%3ccircle%20cx='495.3'%20cy='317.5'%20r='2.1'/%3e%3ccircle%20cx='689.5'%20cy='171.7'%20r='2.7'/%3e%3ccircle%20cx='1213.3'%20cy='63.9'%20r='3.1'/%3e%3ccircle%20cx='238.7'%20cy='32.6'%20r='1.8'/%3e%3ccircle%20cx='175.4'%20cy='42.9'%20r='1'/%3e%3ccircle%20cx='493.2'%20cy='4'%20r='2.5'/%3e%3ccircle%20cx='676.1'%20cy='19.5'%20r='2.3'/%3e%3ccircle%20cx='96.7'%20cy='125.2'%20r='1.2'/%3e%3c/g%3e%3cpath%20d='M0%20300%20C220%20240%20420%20250%20620%20290%20C820%20330%201000%20250%201220%20240%20C1380%20232%201500%20262%201600%20280%20L1600%20420%20L0%20420%20Z'%20fill='%23e3ecf4'/%3e%3cpath%20d='M0%20350%20C260%20310%20520%20330%20760%20350%20C1000%20370%201260%20320%201600%20330%20L1600%20420%20L0%20420%20Z'%20fill='%23f3f7fb'/%3e%3cg%20fill='%23ffffff'%20stroke='%23b9c9d8'%20stroke-width='2'%20stroke-linejoin='round'%3e%3cpath%20transform='translate(1360%20218)%20scale(0.6)'%20d='M-64%20-18%20C-60%20-34%20-30%20-40%200%20-38%20C24%20-37%2040%20-34%2052%20-28%20C60%20-24%2066%20-24%2070%20-26%20C73%20-28%2076%20-27%2076%20-24%20C84%20-22%2092%20-16%2098%20-10%20C99%20-7%2097%20-5%2093%20-5%20C86%20-4%2080%20-2%2074%200%20C66%202%2060%206%2056%2012%20L57%2038%20C57%2041%2055%2042%2052%2042%20L44%2042%20C42%2042%2041%2040%2042%2038%20L40%2018%20C20%2022%200%2022%20-20%2018%20L-22%2038%20C-22%2041%20-24%2042%20-27%2042%20L-36%2042%20C-38%2042%20-39%2040%20-38%2038%20L-44%2014%20C-56%2010%20-66%200%20-64%20-18%20Z'/%3e%3cpath%20transform='translate(1442%20240)%20scale(0.34)'%20d='M-64%20-18%20C-60%20-34%20-30%20-40%200%20-38%20C24%20-37%2040%20-34%2052%20-28%20C60%20-24%2066%20-24%2070%20-26%20C73%20-28%2076%20-27%2076%20-24%20C84%20-22%2092%20-16%2098%20-10%20C99%20-7%2097%20-5%2093%20-5%20C86%20-4%2080%20-2%2074%200%20C66%202%2060%206%2056%2012%20L57%2038%20C57%2041%2055%2042%2052%2042%20L44%2042%20C42%2042%2041%2040%2042%2038%20L40%2018%20C20%2022%200%2022%20-20%2018%20L-22%2038%20C-22%2041%20-24%2042%20-27%2042%20L-36%2042%20C-38%2042%20-39%2040%20-38%2038%20L-44%2014%20C-56%2010%20-66%200%20-64%20-18%20Z'/%3e%3c/g%3e%3c/svg%3e") bottom/max(100%,1100px) no-repeat,linear-gradient(#e3eff9 0%,#f3f8fc 50%,#f9fbfd 100%);position:fixed;inset:0}@media (prefers-color-scheme:dark){:root:not([data-theme=light]) body:before{background:url(/_astro/polar-night-sky.CnDljT2U.svg) top/max(100%,720px) no-repeat,radial-gradient(65% 28% at 24% 0,#40d6a04d,#0000 70%),radial-gradient(40% 34% at 50% 4%,#3cc8aa2e,#0000 70%),radial-gradient(45% 24% at 80% 0,#8c6eff2e,#0000 70%),linear-gradient(#0a1424 0%,#0b1220 55%,#0c1322 100%)}}:root[data-theme=dark] body:before{background:url(/_astro/polar-night-sky.CnDljT2U.svg) top/max(100%,720px) no-repeat,radial-gradient(65% 28% at 24% 0,#40d6a04d,#0000 70%),radial-gradient(40% 34% at 50% 4%,#3cc8aa2e,#0000 70%),radial-gradient(45% 24% at 80% 0,#8c6eff2e,#0000 70%),linear-gradient(#0a1424 0%,#0b1220 55%,#0c1322 100%)}@media print{body:before{display:none}}a{color:var(--color-accent)}.container{max-width:var(--max-width);margin:0 auto;padding:0 1rem}.skip-link{position:absolute;left:-999px}.skip-link:focus{background:var(--color-bg);padding:.5rem;top:1rem;left:1rem}.site-header{border-bottom:1px solid var(--color-border);padding:.4rem 0;position:relative}.site-header nav{align-items:center;gap:.25rem .5rem;display:flex}.site-header .nav-start{align-items:center;gap:.5rem;margin-right:auto;display:flex}.site-header .brand{color:var(--color-text);white-space:nowrap;font-weight:700;text-decoration:none}.site-header .nav-search{align-items:center;gap:.3rem;min-height:2.75rem;padding:0 .4rem;display:inline-flex}.site-header .nav-menu summary{border:1px solid var(--color-border);width:2.75rem;height:2.75rem;color:var(--color-accent);cursor:pointer;border-radius:.5rem;justify-content:center;align-items:center;list-style:none;display:flex}.site-header .nav-menu summary::-webkit-details-marker{display:none}.site-header .nav-menu[open] summary,.site-header .nav-menu summary:hover{border-color:var(--color-accent);background:var(--color-surface)}.site-header .nav-panel{z-index:20;border-bottom:1px solid var(--color-border);background:var(--color-bg);padding:.5rem 1rem 1rem;position:absolute;top:100%;left:0;right:0;box-shadow:0 8px 20px #0000002e}.site-header .nav-panel ul{margin:0;padding:0;list-style:none}.site-header .nav-panel li a{border-radius:.3rem;align-items:center;min-height:2.75rem;padding:0 .75rem;text-decoration:none;display:flex}.site-header .nav-panel li a:hover{background:var(--color-surface);text-decoration:underline}.site-header .nav-panel li a[aria-current]{background:var(--color-surface);color:var(--color-text);font-weight:600}.site-header .nav-panel .language-list{border-top:1px solid var(--color-border);margin-top:.5rem;padding-top:.25rem}.site-header .nav-links,.site-header .language-menu{display:none}@media (width<=429px),(width>=900px) and (width<=1099px){.site-header .nav-search-label{clip:rect(0 0 0 0);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}.site-header .nav-search{justify-content:center;min-width:2.75rem;padding:0}}@media (width>=900px){.site-header{--nav-control-color:var(--nav-text);--nav-control-border:#ffffff59;background:var(--nav-band);color:var(--nav-text);border-bottom:0;padding:0}.site-header nav.container{flex-wrap:nowrap;gap:.15rem;max-width:72rem}.site-header .nav-menu{display:none}.site-header .nav-links{gap:.15rem;margin:0 auto 0 0;padding:0;list-style:none;display:flex}.site-header .language-menu{margin-left:.25rem;display:block}.site-header .nav-start{gap:.6rem;margin-right:.75rem}.site-header .brand{color:var(--nav-text);letter-spacing:.01em;white-space:nowrap;align-items:center;gap:.45rem;font-size:1.1rem;font-weight:800;display:inline-flex}.site-header .brand:before{content:"";background:var(--nav-sun);border-radius:50%;width:.7rem;height:.7rem}.site-header .nav-links a,.site-header .nav-search{min-height:3.5rem;color:var(--nav-muted);white-space:nowrap;align-items:center;padding:0 .45rem;font-size:.92rem;text-decoration:none;display:flex;box-shadow:inset 0 -3px #0000}.site-header .nav-links a:hover,.site-header .nav-search:hover{color:var(--nav-text);box-shadow:inset 0 -3px 0 var(--nav-muted)}.site-header .nav-links a[aria-current],.site-header .nav-search[aria-current]{color:var(--nav-text);box-shadow:inset 0 -3px 0 var(--nav-sun);font-weight:700}.site-header a:focus-visible,.site-header summary:focus-visible,.site-header button:focus-visible{outline:2px solid var(--nav-sun);outline-offset:-2px}.site-header .theme-picker{border-color:#ffffff59}.site-header .theme-picker button{color:var(--nav-muted)}.site-header .theme-picker button[aria-pressed=true]{background:var(--nav-text);color:var(--nav-band)}}@media (width<=369px),(width>=900px) and (width<=939px){.site-header .brand{white-space:normal;line-height:1.15}.site-header .brand:before{flex-shrink:0}}.site-footer{border-top:1px solid var(--color-border);color:var(--color-muted);margin-top:2rem;padding:1rem 0;font-size:.9rem}.theme-picker{border:1px solid var(--color-border);border-radius:999px;gap:.15rem;padding:.15rem;display:inline-flex}.theme-picker[hidden]{display:none}.theme-picker button{width:1.65rem;height:1.65rem;color:var(--color-muted);cursor:pointer;background:0 0;border:0;border-radius:999px;justify-content:center;align-items:center;padding:0;display:inline-flex}.theme-picker button:hover{color:var(--color-text)}.theme-picker button[aria-pressed=true]{background:var(--color-accent);color:var(--color-on-accent)}.visually-hidden{clip:rect(0 0 0 0);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}article table{border-collapse:collapse;width:100%;margin:1.5rem 0;font-size:.95rem}article th,article td{text-align:left;vertical-align:top;border-bottom:1px solid var(--color-border);padding:.55rem .6rem}article thead th{border-bottom:2px solid var(--color-border);background:var(--color-surface)}@media (width<=600px){article table{font-size:.88rem}article th,article td{padding:.45rem .35rem}}.newsletter[data-astro-cid-sornssq2]{background:var(--color-surface);border:1px solid var(--color-border);border-top:4px solid var(--color-accent);border-radius:6px;margin:3rem 0 1rem;padding:1.25rem 1.25rem 1.1rem}.newsletter[data-astro-cid-sornssq2] h2[data-astro-cid-sornssq2]{margin:0 0 .25rem;font-size:1.2rem}.intro[data-astro-cid-sornssq2]{margin:0 0 1rem}label[data-astro-cid-sornssq2]{margin-bottom:.3rem;font-weight:600;display:block}.row[data-astro-cid-sornssq2]{flex-wrap:wrap;gap:.5rem;display:flex}input[data-astro-cid-sornssq2],button[data-astro-cid-sornssq2]{min-height:2.75rem;font:inherit;border-radius:4px}input[data-astro-cid-sornssq2]{min-width:0;color:var(--color-text);background:var(--color-bg);border:1px solid var(--color-muted);flex:16rem;padding:.5rem .75rem}button[data-astro-cid-sornssq2]{background:var(--color-accent);color:var(--color-on-accent);border:1px solid var(--color-accent);cursor:pointer;flex:none;padding:.5rem 1.25rem;font-weight:600}button[data-astro-cid-sornssq2]:hover{filter:brightness(1.1)}input[data-astro-cid-sornssq2]:focus-visible,button[data-astro-cid-sornssq2]:focus-visible{outline:3px solid var(--color-accent);outline-offset:2px}.consent[data-astro-cid-sornssq2]{color:var(--color-muted);margin:.75rem 0 0;font-size:.85rem}.consent[data-astro-cid-sornssq2] a[data-astro-cid-sornssq2]{color:inherit}.pending[data-astro-cid-sornssq2]{color:var(--color-muted);margin:0}@media (width<=429px){button[data-astro-cid-sornssq2]{flex:100%}}.language-menu[data-astro-cid-l4evwy7q]{font-size:.9rem;position:relative}summary[data-astro-cid-l4evwy7q]{border:1px solid var(--nav-control-border,var(--color-border));min-height:2rem;color:var(--nav-control-color,var(--color-accent));cursor:pointer;white-space:nowrap;border-radius:999px;align-items:center;gap:.35rem;padding:.2rem .65rem;list-style:none;display:inline-flex}summary[data-astro-cid-l4evwy7q]::-webkit-details-marker{display:none}summary[data-astro-cid-l4evwy7q]:hover{border-color:var(--nav-control-color,var(--color-accent))}.chevron[data-astro-cid-l4evwy7q]{transition:transform .15s}[data-astro-cid-l4evwy7q][open] .chevron[data-astro-cid-l4evwy7q]{transform:rotate(180deg)}@media (prefers-reduced-motion:reduce){.chevron[data-astro-cid-l4evwy7q]{transition:none}}ul[data-astro-cid-l4evwy7q]{z-index:10;border:1px solid var(--color-border);background:var(--color-bg);min-width:11rem;color:var(--color-text);border-radius:.5rem;margin:0;padding:.3rem;list-style:none;position:absolute;top:calc(100% + .4rem);right:0;box-shadow:0 6px 20px #0000002e}li[data-astro-cid-l4evwy7q] a[data-astro-cid-l4evwy7q],li[data-astro-cid-l4evwy7q] span[data-astro-cid-l4evwy7q]{white-space:nowrap;border-radius:.3rem;justify-content:space-between;align-items:center;gap:.75rem;min-height:2.75rem;padding:0 .75rem;display:flex}.language-heading[data-astro-cid-l4evwy7q]{letter-spacing:.04em;text-transform:uppercase;color:var(--color-muted);margin:0;padding:.5rem .75rem 0;font-size:.8rem;font-weight:600}.language-list[data-astro-cid-l4evwy7q] ul[data-astro-cid-l4evwy7q]{min-width:0;box-shadow:none;background:0 0;border:0;padding:0;position:static}li[data-astro-cid-l4evwy7q] a[data-astro-cid-l4evwy7q]{text-decoration:none}li[data-astro-cid-l4evwy7q] a[data-astro-cid-l4evwy7q]:hover{background:var(--color-surface);text-decoration:underline}[data-astro-cid-l4evwy7q][aria-current]{color:var(--color-text);font-weight:600}