/* sis.mom 文字页（项目说明 / 规则 / 隐私 / 404）：X「螺旋引擎」的安静版本。只有深色。 */
:root{--bg:#000;--ink:#fff;--sub:#9A9AA3;--ter:#82828C;--line:rgba(255,255,255,.1);--s1:#0B0B0D;--s2:#141417;--red:#FF2E3B;--gold:#F5F5F7;color-scheme:dark}
html{background:#000}
body{background:#000;color:#fff;font:16px/1.7 var(--sans);overflow-x:hidden}
.i18n body{visibility:hidden}
body::before{content:"";position:fixed;inset:-20% -20% auto auto;width:70vmax;height:70vmax;border-radius:50%;background:radial-gradient(closest-side,rgba(224,20,31,.22),rgba(233,194,122,.06) 55%,transparent 70%);pointer-events:none;z-index:-1}
a{color:inherit}
.home{width:min(1120px,100% - 32px);margin:0 auto;padding:0 0 96px}
.home-nav{display:flex;align-items:center;justify-content:space-between;gap:16px;height:72px;margin-bottom:40px;border-bottom:1px solid var(--line)}
.home-nav .logo,.home-nav .logo a{display:flex;align-items:center;gap:10px;font-weight:700;text-decoration:none}
.hn{display:flex;gap:24px;font-size:14px;color:var(--sub)}.hn a{text-decoration:none}.hn a:hover,.hn a[aria-current]{color:#fff}
.kicker{font-family:var(--mono);font-size:12px;letter-spacing:.06em;color:var(--ter);margin:0 0 12px}
.home h1{font-size:clamp(40px,6vw,80px)!important;font-weight:800!important;letter-spacing:-.045em;line-height:1.02;margin:0}
.home h2{font-size:clamp(22px,2.4vw,30px);font-weight:800;letter-spacing:-.02em;color:#fff!important;margin:56px 0 14px!important}
.home h3{font-size:18px;margin:28px 0 8px}
.home p,.home li{color:var(--sub)}.home b,.home strong{color:#fff}
.home ul,.home ol{padding-left:20px}.home li{margin:6px 0}
.fine{font-size:13px;color:var(--ter)}
.lede{font-size:clamp(17px,1.6vw,20px)}
.home table{width:100%;border-collapse:collapse;margin:16px 0;font-variant-numeric:tabular-nums}
.home td,.home th{padding:12px 8px 12px 0;border-bottom:1px solid var(--line);text-align:left;color:var(--sub)}
.home th{font-size:12px;color:var(--ter);font-weight:500}
.home td:first-child{color:#fff}
.home code{font-family:var(--mono);font-size:.9em;background:var(--s2);padding:1px 6px;border-radius:6px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:56px;padding:0 30px;border-radius:999px;font-weight:700;text-decoration:none;white-space:nowrap}
.btn.primary{background:#fff;color:#000!important;box-shadow:0 10px 50px -8px rgba(224,20,31,.55)}
.community-row{display:flex;gap:20px;margin-top:20px;font-size:14px;color:var(--sub)}
.foot-brand{display:flex;align-items:center;gap:8px;font-weight:600}
.callout{padding:18px 20px;border-radius:16px;background:var(--s1);border:1px solid var(--line);border-left:2px solid var(--gold);margin:20px 0}
@media (max-width:767px){.hn{gap:14px;font-size:13px}.hn a:not([aria-current]):not(#langLink){display:none}}

.home :is(a,button,select,summary){min-height:44px}
.home :focus-visible{outline:2px solid var(--ink);outline-offset:4px}
#contract-content{max-width:760px;overflow-wrap:anywhere}
#contract-content a{display:inline-flex;align-items:center;min-height:44px}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}}