:root{--canvas:#010102;--s1:#0f1011;--s2:#141516;--s3:#18191a;--s4:#191a1b;--line:#23252a;--line2:#34343a;--line3:#3e3e44;
--ink:#f7f8f8;--ink2:#d0d6e0;--ink3:#8a8f98;--ink4:#62666d;--pri:#5e6ad2;--pri2:#828fff;--ok:#27a644;--warn:#c08b3e;--bad:#d26b6b;
--r-n:#8a8f98;--r-1:#5e6ad2;--r-2:#c08b3e;--r-3:#4cb782;--r-4:#d26b8a;color-scheme:dark}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--canvas);color:var(--ink2);font:400 15px/1.6 Inter,"Noto Sans SC",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}
a{color:var(--ink)}a:hover{color:var(--pri2)}
h1,h2,h3{color:var(--ink);font-weight:600;letter-spacing:-.02em;text-wrap:balance;margin:0}
p{margin:0}
.mono{font-family:"JetBrains Mono",ui-monospace,Consolas,monospace;font-size:13px}
.muted{color:var(--ink3)}.subtle{color:var(--ink4)}
.wrap{max-width:1200px;margin:0 auto;padding-left:max(24px,env(safe-area-inset-left,0px));padding-right:max(24px,env(safe-area-inset-right,0px))}
.narrow{max-width:760px}
:focus-visible{outline:2px solid rgba(94,105,209,.5);outline-offset:2px}
/* nav */
.top{border-bottom:1px solid var(--line);position:sticky;top:0;background:rgba(1,1,2,.86);backdrop-filter:blur(12px);z-index:20}
.top .wrap{height:56px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;font-weight:600;letter-spacing:-.01em}
.mark{width:20px;height:20px;border-radius:5px;background:var(--pri);display:flex;align-items:center;justify-content:center;gap:2px;flex:none}
.mark i{width:2px;background:#fff;border-radius:1px;display:block}.mark i:nth-child(1){height:6px}.mark i:nth-child(2){height:11px}.mark i:nth-child(3){height:8px}
.navmid{display:flex;gap:28px;font-size:14px}
.nl{color:var(--ink3);text-decoration:none}.nl:hover{color:var(--ink)}
.row{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font:500 14px/1.2 inherit;font-family:inherit;border-radius:8px;padding:8px 14px;border:1px solid transparent;cursor:pointer;text-decoration:none;white-space:nowrap}
.btn-p{background:var(--pri);color:#fff}.btn-p:hover{background:var(--pri2);color:#fff}
.btn-s{background:var(--s1);color:var(--ink);border-color:var(--line)}.btn-s:hover{background:var(--s2);color:var(--ink)}
.btn-t{background:transparent;color:var(--ink3)}.btn-t:hover{color:var(--ink)}
.btn-i{background:#fff;color:#000}.btn-i:hover{background:var(--ink2);color:#000}
.btn-d{background:transparent;color:var(--bad);border-color:#4a2a2a}.btn-d:hover{background:#1a1010;color:var(--bad)}
.btn-lg{font-size:15px;padding:10px 18px}
.btn[disabled]{opacity:.45;cursor:not-allowed}
/* surfaces */
.card{background:var(--s1);border:1px solid var(--line);border-radius:12px;padding:24px}
.card.feat{background:var(--s2);border-color:var(--line2)}
.panel{background:var(--s1);border:1px solid var(--line);border-radius:16px;overflow:hidden}
.pill{display:inline-flex;align-items:center;gap:6px;background:var(--s2);border:1px solid var(--line);color:var(--ink2);border-radius:999px;padding:1px 9px;font-size:12px;line-height:20px;white-space:nowrap}
.dot{width:6px;height:6px;border-radius:999px;background:var(--ink3);display:inline-block}
.dot.ok{background:var(--ok)}.dot.warn{background:var(--warn)}.dot.bad{background:var(--bad)}.dot.pri{background:var(--pri)}
.eyebrow{font-size:13px;font-weight:500;letter-spacing:.4px;color:var(--ink3)}
/* forms */
label{display:block;font-size:13px;font-weight:500;color:var(--ink2);margin-bottom:6px}
.field{display:flex;flex-direction:column;gap:0}
.hint{font-size:12px;color:var(--ink3);margin-top:6px}
input[type=text],input[type=email],input[type=password],input[type=number],input[type=search],select,textarea{width:100%;background:var(--s1);color:var(--ink);border:1px solid var(--line2);border-radius:8px;padding:8px 12px;font:inherit;font-size:14px}
textarea{line-height:1.7;resize:vertical;min-height:120px}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--pri);box-shadow:0 0 0 2px rgba(94,105,209,.35)}
.check{display:grid;grid-template-columns:18px minmax(0,1fr);gap:10px;align-items:start;font-size:14px;color:var(--ink2);font-weight:400;margin:0;cursor:pointer}
.check input{width:16px;height:16px;margin:3px 0 0;accent-color:var(--pri)}
.stack{display:flex;flex-direction:column;gap:16px}
.stack-s{display:flex;flex-direction:column;gap:8px}
.grid2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.grid3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.grid4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
.msg{border-radius:8px;padding:10px 14px;font-size:14px;border:1px solid var(--line2);background:var(--s2);color:var(--ink2)}
.msg.err{border-color:#5a2c2c;background:#170d0d;color:#f1c4c4}
.msg.ok{border-color:#1f4d2b;background:#0b160e;color:#bfe6c8}
.radio-card{display:grid;grid-template-columns:18px minmax(0,1fr);gap:10px;padding:14px;border:1px solid var(--line);border-radius:10px;background:var(--s1);cursor:pointer;font-weight:400;margin:0}
.radio-card:has(input:checked){border-color:var(--pri);background:var(--s2)}
.radio-card input{accent-color:var(--pri);margin:3px 0 0}
/* tables */
.tbl{overflow-x:auto}
table{width:100%;border-collapse:collapse;font-size:14px}
th{text-align:left;font-weight:500;color:var(--ink3);font-size:12px;padding:8px 12px;border-bottom:1px solid var(--line)}
td{padding:12px;border-bottom:1px solid var(--line);color:var(--ink2);vertical-align:top}
tr:hover td{background:rgba(15,16,17,.6)}
.num{text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap}
/* marketing */
.hero{padding-block:120px 72px}
.h-xl{font-size:72px;line-height:1.08}
.h-lg{font-size:52px;line-height:1.12}
.h-md{font-size:38px;line-height:1.18}
.h-sm{font-size:26px;line-height:1.25}
.lead{font-size:19px;color:var(--ink3);max-width:34em}
.sec{padding-block:96px;border-top:1px solid var(--line)}
.split{display:grid;grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr);gap:64px;align-items:center}
.split.rev{grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr)}
.shot{display:grid;grid-template-columns:minmax(0,1fr) 300px}
.shot-main{padding:24px;display:flex;flex-direction:column;gap:4px;border-right:1px solid var(--line);min-width:0}
.shot-side{padding:24px;display:flex;flex-direction:column;gap:16px}
.line{display:grid;grid-template-columns:76px minmax(0,1fr);gap:14px;padding:10px 12px;border-radius:8px}
.line.on{background:var(--s2)}
.who{display:inline-flex;align-items:center;gap:6px;font-size:12px;color:var(--ink2);height:22px}
.sw{width:6px;height:6px;border-radius:2px;display:inline-block;flex:none}
.tag{font-family:"JetBrains Mono",ui-monospace,monospace;font-size:11px;color:var(--ink3);background:var(--s2);border:1px solid var(--line);border-radius:4px;padding:1px 6px;margin-right:8px;vertical-align:2px}
.player{border-top:1px solid var(--line);padding:14px 16px;display:flex;align-items:center;gap:16px}
.play{flex:none;width:36px;height:36px;border-radius:8px;border:0;background:#fff;color:#000;cursor:pointer;display:grid;place-items:center}
.wave{flex:1;min-width:0;height:36px;display:flex;align-items:center;gap:2px;cursor:pointer}
.wave span{flex:1;min-width:1px;border-radius:1px;background:var(--line2)}
.wave span.p{background:var(--ink)}
.tabs{display:flex;gap:4px;background:var(--canvas);border:1px solid var(--line);border-radius:999px;padding:3px}
.tabs button{font:inherit;font-size:13px;border:0;border-radius:999px;padding:5px 12px;cursor:pointer;background:transparent;color:var(--ink3)}
.tabs button[aria-selected=true]{background:var(--s2);color:var(--ink)}
.stat{background:var(--s2);border:1px solid var(--line);border-radius:8px;padding:10px 12px;display:flex;flex-direction:column;gap:2px}
.stat b{font-size:18px;font-weight:600;color:var(--ink);font-variant-numeric:tabular-nums}
.stat span{font-size:12px;color:var(--ink3)}
details.faq{border-bottom:1px solid var(--line)}
details.faq summary{list-style:none;cursor:pointer;padding:18px 0;display:flex;justify-content:space-between;gap:16px;color:var(--ink);font-size:16px;font-weight:500}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary::after{content:"+";color:var(--ink3)}
details.faq[open] summary::after{content:"−"}
details.faq p{padding-bottom:18px;color:var(--ink3)}
footer.foot{border-top:1px solid var(--line);padding-block:48px 32px;font-size:12px;color:var(--ink3)}
footer.foot .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:16px}
footer.foot nav{display:flex;flex-wrap:wrap;gap:20px}
/* legal */
.legal{padding-block:64px 96px}
.legal h1{font-size:38px;line-height:1.18;margin-bottom:8px}
.legal h2{font-size:20px;font-weight:600;margin:40px 0 12px;letter-spacing:-.01em}
.legal p,.legal li{color:var(--ink2);font-size:15px;line-height:1.75}
.legal p+p{margin-top:12px}
.legal ul,.legal ol{padding-left:22px;margin:12px 0}
.legal li+li{margin-top:6px}
.legal .tbl{margin:16px 0;border:1px solid var(--line);border-radius:12px}
.legal table td,.legal table th{border-bottom:1px solid var(--line)}
.legal aside.zh{background:var(--s1);border:1px solid var(--line);border-radius:12px;padding:16px 20px;margin:24px 0 8px}
.legal aside.zh p,.legal aside.zh li{font-size:14px;color:var(--ink2)}
.legal aside.zh ul{margin:8px 0 0}
mark.todo{background:#2a2410;color:#f0d68a;border-radius:4px;padding:0 4px}
.doc-tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:32px}
/* auth */
.auth{min-height:calc(100vh - 57px);display:grid;place-items:center;padding-block:48px}
.auth .card{width:100%;max-width:420px;padding:32px}
/* app shell */
.shell{display:grid;grid-template-columns:232px minmax(0,1fr);min-height:100vh}
.side{border-right:1px solid var(--line);padding:16px 12px;display:flex;flex-direction:column;gap:4px;position:sticky;top:0;height:100vh}
.side .brand{padding:6px 8px 16px}
.side a.it{display:flex;align-items:center;gap:10px;padding:7px 10px;border-radius:6px;color:var(--ink3);text-decoration:none;font-size:14px}
.side a.it:hover{background:var(--s1);color:var(--ink)}
.side a.it.on{background:var(--s2);color:var(--ink)}
.side .grow{flex:1}
.side .me{border-top:1px solid var(--line);padding:12px 8px 0;font-size:12px;color:var(--ink3);display:flex;flex-direction:column;gap:8px;overflow:hidden}
.main{padding:32px max(24px,env(safe-area-inset-right,0px)) 64px max(24px,env(safe-area-inset-left,0px));min-width:0}
.main-in{max-width:1040px;margin:0 auto;display:flex;flex-direction:column;gap:24px}
.ph{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;flex-wrap:wrap}
.ph h1{font-size:26px;line-height:1.25}
.kpi{display:flex;flex-direction:column;gap:4px}
.kpi b{font-size:26px;color:var(--ink);font-weight:600;font-variant-numeric:tabular-nums;letter-spacing:-.01em}
.kpi span{font-size:12px;color:var(--ink3)}
.empty{border:1px dashed var(--line2);border-radius:12px;padding:40px;text-align:center;color:var(--ink3);display:flex;flex-direction:column;gap:12px;align-items:center}
.quote{display:flex;justify-content:space-between;gap:12px;font-size:14px;padding:6px 0}
.quote.total{border-top:1px solid var(--line);margin-top:6px;padding-top:12px;color:var(--ink);font-weight:600}
.attest{background:var(--s1);border:1px solid var(--line2);border-radius:12px;padding:20px;display:flex;flex-direction:column;gap:14px}
@media (max-width:1024px){.grid3,.grid4{grid-template-columns:repeat(2,minmax(0,1fr))}.split,.split.rev{grid-template-columns:1fr;gap:40px}}
@media (max-width:768px){.navmid{display:none}.grid2,.grid3,.grid4{grid-template-columns:1fr}.shot{grid-template-columns:1fr}.shot-side{display:none}
 .shell{grid-template-columns:1fr}.side{position:static;height:auto;flex-direction:row;flex-wrap:wrap;align-items:center;border-right:0;border-bottom:1px solid var(--line);padding:8px 12px}
 .side .brand{padding:6px 8px}.side .grow{display:none}.side .me{border:0;padding:0 8px;flex-direction:row;align-items:center}.side .me .em{display:none}
 .h-xl{font-size:44px}.h-lg{font-size:36px}.h-md{font-size:30px}.hero{padding-block:72px 48px}.sec{padding-block:64px}}
@media (max-width:480px){.h-xl{font-size:36px}.line{grid-template-columns:1fr;gap:4px}.player{gap:10px}}