/* Bitstairs · design system */
/* 自托管字体(latin+latin-ext) */
@font-face{font-family:'IBM Plex Mono';font-style:normal;font-weight:500;font-display:swap;src:url('/assets/fonts/ibmplexmono-500-latin-ext.woff2') format('woff2');unicode-range:U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;}
@font-face{font-family:'IBM Plex Mono';font-style:normal;font-weight:500;font-display:swap;src:url('/assets/fonts/ibmplexmono-500-latin.woff2') format('woff2');unicode-range:U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;}
@font-face{font-family:'IBM Plex Mono';font-style:normal;font-weight:600;font-display:swap;src:url('/assets/fonts/ibmplexmono-600-latin-ext.woff2') format('woff2');unicode-range:U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;}
@font-face{font-family:'IBM Plex Mono';font-style:normal;font-weight:600;font-display:swap;src:url('/assets/fonts/ibmplexmono-600-latin.woff2') format('woff2');unicode-range:U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;}
@font-face{font-family:'Inter';font-style:normal;font-weight:700;font-display:swap;src:url('/assets/fonts/inter-700-latin-ext.woff2') format('woff2');unicode-range:U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;}
@font-face{font-family:'Inter';font-style:normal;font-weight:700;font-display:swap;src:url('/assets/fonts/inter-700-latin.woff2') format('woff2');unicode-range:U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;}
@font-face{font-family:'Inter';font-style:normal;font-weight:800;font-display:swap;src:url('/assets/fonts/inter-800-latin-ext.woff2') format('woff2');unicode-range:U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;}
@font-face{font-family:'Inter';font-style:normal;font-weight:800;font-display:swap;src:url('/assets/fonts/inter-800-latin.woff2') format('woff2');unicode-range:U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;}
@font-face{font-family:'Inter';font-style:normal;font-weight:900;font-display:swap;src:url('/assets/fonts/inter-900-latin-ext.woff2') format('woff2');unicode-range:U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;}
@font-face{font-family:'Inter';font-style:normal;font-weight:900;font-display:swap;src:url('/assets/fonts/inter-900-latin.woff2') format('woff2');unicode-range:U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;}

:root{
  --ink:#101013; --sub:#63666e; --faint:#9b9ea6;
  --hair:#e8e8ec; --mark:#ffd900; --paper:#ffffff; --wash:#f7f7f8;
  --ok:#0e8f5a; --warn:#c0392b;
  --mono:"IBM Plex Mono",ui-monospace,monospace;
  --en:"Inter",-apple-system,sans-serif;
  --th:"Noto Sans Thai","Inter",sans-serif;
  --cn:"Inter","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--paper);color:var(--ink);font-family:var(--en);line-height:1.65;-webkit-font-smoothing:antialiased;position:relative}
/* 纸感:极淡的印刷网纹,肉眼几乎不可见但消掉"数字白" */
body::after{content:"";position:fixed;inset:0;pointer-events:none;z-index:-1;opacity:.35;background:
  repeating-linear-gradient(0deg, rgba(16,16,19,.014) 0 1px, transparent 1px 4px)}
body.th{font-family:var(--th)}
body.zh{font-family:var(--cn)}
body.zh h1.giant{letter-spacing:.02em}
body.zh .post h1{letter-spacing:0}
body.zh .fx .t,body.zh .tool h3{font-weight:800}
::selection{background:var(--mark);color:var(--ink)}
a{color:inherit;text-decoration:none}
:focus-visible{outline:3px solid var(--mark);outline-offset:2px}
img,svg{max-width:100%;height:auto}
.wrap{max-width:1180px;margin:0 auto;padding:0 26px}
.wrap-narrow{max-width:840px;margin:0 auto;padding:0 26px}

/* ── 头部 ── */
.top{border-bottom:1px solid var(--hair);background:rgba(255,255,255,.94);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);position:sticky;top:0;z-index:50}
.top .wrap{display:flex;align-items:center;justify-content:space-between;height:54px}
.brand{font-family:var(--en);font-weight:900;font-size:18px;letter-spacing:-.4px}
.brand i{font-style:normal;color:var(--faint);font-weight:800}
.top nav{display:flex;align-items:center;gap:22px;font-size:13.5px;font-weight:600;color:var(--sub)}
.top nav a:hover{color:var(--ink)}
.top .lang{display:inline-flex;border:1.5px solid var(--ink);overflow:hidden;font-size:12px;font-weight:700}
.top .lang a,.top .lang span{padding:3px 10px;color:var(--sub)}
.top .lang .on{background:var(--ink);color:#fff}
.disc2{font-size:11.5px;color:var(--faint);text-align:center;border-bottom:1px solid var(--hair);padding:6px 10px}
.disc2 b{color:var(--sub)}

/* ── 巨字宣言(首页) ── */
.state{padding:64px 0 0;text-align:center}
.state .alias{display:inline-flex;font-family:var(--mono);font-size:13px;color:var(--sub);border:1px solid var(--hair);border-radius:100px;overflow:hidden}
.state .alias span{padding:6px 16px;border-right:1px solid var(--hair)}
.state .alias span:last-child{border-right:0;background:var(--ink);color:#fff}
h1.giant{font-weight:900;font-size:clamp(42px,7.2vw,92px);line-height:1.1;letter-spacing:-1px;margin:26px 0 10px}
h1.giant .row2{display:block}
.markline{position:relative;white-space:nowrap}
/* 手划 marker:两端不齐 + 微倾斜,像真人划的重点 */
.markline::after{content:"";position:absolute;left:-2.5%;right:-1.5%;bottom:7%;height:24%;background:var(--mark);z-index:-1;transform:skewX(-8deg) rotate(-.35deg);border-radius:2px 5px 3px 6px}
.state .lead{font-size:clamp(14px,1.6vw,17px);color:var(--sub);margin:8px 0 0}

/* ── 巨型邀请码格 ── */
.codewall{padding:44px 0 10px;text-align:center}
.cw-lab{font-family:var(--mono);font-size:12.5px;letter-spacing:3px;color:var(--sub);margin-bottom:14px}
.cw-lab b{color:var(--ink)}
.cells{display:flex;justify-content:center;gap:clamp(8px,1.4vw,16px)}
.cell{width:clamp(46px,7.6vw,92px);height:clamp(58px,9.4vw,112px);border:3px solid var(--ink);display:grid;place-items:center;
  font-family:var(--mono);font-weight:600;font-size:clamp(28px,4.8vw,58px);background:#fff;box-shadow:0 6px 0 var(--ink), inset 0 2px 0 rgba(16,16,19,.06);position:relative;
  transition:transform .14s cubic-bezier(.34,1.56,.64,1)}
.cells:hover .cell{transform:translateY(-3px)}
.cells:hover .cell:nth-child(2){transition-delay:.02s}
.cells:hover .cell:nth-child(3){transition-delay:.04s}
.cells:hover .cell:nth-child(4){transition-delay:.06s}
.cells:hover .cell:nth-child(5){transition-delay:.08s}
.cells:hover .cell:nth-child(6){transition-delay:.1s}
.cell.y{background:var(--mark);box-shadow:0 6px 0 var(--ink), inset 0 2px 0 rgba(16,16,19,.1)}
.cell .caret{position:absolute;bottom:8px;width:46%;height:3px;background:var(--ink);opacity:.16}
.cw-under{margin-top:22px;font-size:14.5px;color:var(--sub)}
.cw-under b{color:var(--ink)}
.cw-actions{display:flex;justify-content:center;gap:12px;margin-top:18px;flex-wrap:wrap}
.btn-copy{font-family:inherit;font-weight:700;font-size:15px;background:#fff;border:2.5px solid var(--ink);padding:13px 26px;cursor:pointer;box-shadow:4px 4px 0 var(--ink);transition:transform .1s,box-shadow .1s;color:var(--ink)}
.btn-copy:hover{transform:translate(2px,2px);box-shadow:2px 2px 0 var(--ink)}
.btn-go{display:inline-flex;align-items:center;gap:9px;font-weight:900;font-size:16px;color:#fff !important;background:var(--ink);border:2.5px solid var(--ink);padding:13px 30px;box-shadow:4px 4px 0 rgba(16,16,19,.25);transition:transform .1s}
.btn-go:hover{transform:translate(2px,2px)}
.cw-foot{margin-top:14px;font-size:11px;color:var(--faint);padding:0 20px}

/* ── 症状/目录表 ── */
.fixes{margin-top:58px;border-top:3px solid var(--ink)}
.fx-h{display:flex;align-items:baseline;justify-content:space-between;padding:22px 26px 4px}
.fx-h h2{font-size:21px;font-weight:900;letter-spacing:.5px}
.fx-h .mono{font-family:var(--mono);font-size:11px;color:var(--faint)}
.fxgrid{display:grid;grid-template-columns:1fr 1fr}
.fx{display:flex;align-items:center;gap:18px;padding:20px 26px;border-bottom:1px solid var(--hair);position:relative;overflow:hidden}
.fx:nth-child(odd){border-right:1px solid var(--hair)}
.fx::before{content:"";position:absolute;left:0;top:0;bottom:0;width:0;background:var(--mark);transition:width .18s;z-index:0}
.fx:hover::before{width:100%}
.fx>*{position:relative;z-index:1}
.fx .no{font-weight:900;font-size:34px;color:transparent;-webkit-text-stroke:1.6px var(--ink);flex:0 0 58px;line-height:1;transition:color .15s}
.fx:hover .no{color:var(--ink);-webkit-text-stroke:0}
.fx .t{font-size:16.5px;font-weight:700;display:block}
.fx .d{font-size:12.5px;color:var(--sub);display:block}
.fx .go{margin-left:auto;font-weight:900;font-size:18px;flex:0 0 auto;transition:transform .15s}
.fx:hover .go{transform:translateX(5px)}

/* ── 通用区块头 ── */
.sec{margin-top:58px;border-top:3px solid var(--ink)}
.sec-h{display:flex;align-items:baseline;justify-content:space-between;padding:22px 0 18px}
.sec-h h2{font-size:21px;font-weight:900}
.sec-h .mono{font-family:var(--mono);font-size:11px;color:var(--faint)}

/* 工具卡 */
.toolgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border:1.5px solid var(--ink)}
.tool{padding:22px;border-right:1px solid var(--hair);border-bottom:1px solid var(--hair);position:relative;transition:background .12s}
.tool:hover{background:var(--wash)}
.tool:nth-child(3n){border-right:0}
.tool .tno{font-family:var(--mono);font-size:11px;color:var(--faint)}
.tool h3{font-size:16.5px;font-weight:800;margin:6px 0 4px}
.tool p{font-size:13px;color:var(--sub)}
.tool .go{position:absolute;right:18px;top:20px;font-weight:900}

/* 文章列表行 */
.artlist{border:1.5px solid var(--ink)}
.artrow{display:flex;align-items:baseline;gap:16px;padding:15px 20px;border-bottom:1px solid var(--hair)}
.artrow:last-child{border-bottom:0}
.artrow:hover{background:var(--wash)}
.artrow .tag{font-family:var(--mono);font-size:10.5px;border:1px solid var(--ink);padding:1px 7px;flex:0 0 auto}
.artrow .t{font-weight:700;font-size:15px}
.artrow .d{margin-left:auto;font-family:var(--mono);font-size:11px;color:var(--faint);flex:0 0 auto}

/* ── 文章页 ── */
.crumbs{font-size:12px;color:var(--faint);padding:18px 0 0}
.crumbs a{color:var(--sub)}
.crumbs a:hover{color:var(--ink)}
article.post{padding:16px 0 40px}
.post .kick{font-family:var(--mono);font-size:11.5px;letter-spacing:2px;color:var(--sub);text-transform:uppercase}
.post h1{font-size:clamp(28px,4vw,44px);font-weight:900;line-height:1.18;letter-spacing:-.5px;margin:10px 0 8px}
.post .meta{font-size:12.5px;color:var(--faint);margin-bottom:26px}
.post .meta b{color:var(--sub);font-weight:600}
.post h2{font-size:22px;font-weight:900;margin:38px 0 12px;padding-left:14px;border-left:5px solid var(--mark)}
.post h3{font-size:17px;font-weight:800;margin:26px 0 8px}
.post p{margin:0 0 16px;font-size:15.5px;color:#2a2b31}
.post ul,.post ol{margin:0 0 16px 22px;font-size:15.5px;color:#2a2b31}
.post li{margin-bottom:7px}
.post strong{color:var(--ink)}
.post .lede{font-size:17.5px;line-height:1.7;color:var(--sub);margin-bottom:22px}
.post h2{scroll-margin-top:80px}
.post h3{scroll-margin-top:80px}
.post table{width:100%;border-collapse:collapse;border:1.5px solid var(--ink);margin:18px 0;font-size:14px}
.post th{background:var(--ink);color:#fff;text-align:left;padding:9px 12px;font-weight:700;font-size:12.5px;letter-spacing:.04em;text-transform:uppercase}
.post td{border-bottom:1px solid var(--hair);padding:9px 12px;vertical-align:top}
.post tr:last-child td{border-bottom:0}
.post td:first-child{font-weight:600}
.post blockquote{border-left:5px solid var(--ink);background:var(--wash);padding:12px 18px;margin:18px 0;font-size:14.5px;color:var(--sub)}
.post hr{border:0;border-top:3px solid var(--ink);width:64px;margin:30px 0}
.post code{font-family:var(--mono);font-size:.92em;background:var(--wash);border:1px solid var(--hair);padding:1px 6px}
.post figure{margin:20px 0;border:1.5px solid var(--ink)}
.post figcaption{font-size:12px;color:var(--faint);padding:8px 12px;border-top:1px solid var(--hair)}
.post figure.illo{box-shadow:5px 5px 0 var(--hair)}
.post figure.illo img{display:block;width:100%;height:auto}
.toc{border:1.5px solid var(--ink);background:var(--wash);padding:16px 20px;margin:22px 0;font-size:14px}
.toc .lab{font-family:var(--mono);font-size:11px;letter-spacing:2px;color:var(--sub);display:block;margin-bottom:8px}
.toc ol{margin:0 0 0 20px}
.toc li{margin-bottom:4px}
.note-box{border:1.5px solid var(--ink);border-left:6px solid var(--mark);background:#fffbe6;padding:14px 18px;margin:18px 0;font-size:14px}
.warn-box{border:1.5px solid var(--warn);border-left:6px solid var(--warn);background:#fdf3f2;padding:14px 18px;margin:18px 0;font-size:14px}
.step{display:flex;gap:16px;margin:18px 0;padding:16px 18px;border:1.5px solid var(--ink);box-shadow:4px 4px 0 var(--hair)}
.step .sno{font-weight:900;font-size:26px;color:transparent;-webkit-text-stroke:1.4px var(--ink);flex:0 0 40px;line-height:1.1}
.step h3{margin:0 0 4px}
.step p{margin:0;font-size:14px}
/* 行内转化条(文章内) */
.cta-strip{display:flex;align-items:center;gap:16px;flex-wrap:wrap;border:2.5px solid var(--ink);box-shadow:5px 5px 0 var(--mark);padding:16px 20px;margin:28px 0}
.cta-strip .code{font-family:var(--mono);font-weight:600;font-size:22px;letter-spacing:2px;border:2px dashed var(--ink);padding:6px 14px;background:#fff}
.cta-strip .txt{font-size:13.5px;color:var(--sub);flex:1 1 220px}
.cta-strip .txt b{color:var(--ink)}
/* FAQ */
.faq{border:1.5px solid var(--ink);margin:24px 0}
.faq details{border-bottom:1px solid var(--hair)}
.faq details:last-child{border-bottom:0}
.faq summary{cursor:pointer;font-weight:700;font-size:15px;padding:14px 18px;list-style:none;position:relative}
.faq summary::after{content:"+";position:absolute;right:18px;font-weight:900}
.faq details[open] summary::after{content:"–"}
.faq .a{padding:0 18px 14px;font-size:14px;color:var(--sub)}
/* 相关阅读 */
.related{margin:34px 0 0;border-top:3px solid var(--ink);padding-top:16px}
.related .lab{font-family:var(--mono);font-size:11px;letter-spacing:2px;color:var(--sub)}
.related ul{list-style:none;margin:10px 0 0}
.related li{padding:7px 0;border-bottom:1px solid var(--hair);font-weight:600;font-size:14.5px}
.related li a:hover{background:var(--mark)}

/* ── 工具页 ── */
.tool-shell{border:2.5px solid var(--ink);box-shadow:6px 6px 0 var(--hair);padding:26px;margin:26px 0}
.tool-shell .row{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:14px}
.tool-shell label{font-size:12.5px;font-weight:700;display:block;margin-bottom:5px;color:var(--sub)}
.tool-shell input,.tool-shell select{font-family:var(--mono);font-size:16px;padding:10px 12px;border:2px solid var(--ink);background:#fff;width:100%;color:var(--ink)}
.tool-shell .field{flex:1 1 160px}
.tool-result{background:var(--ink);color:#fff;padding:22px 24px;margin-top:8px}
.tool-result .big{font-family:var(--mono);font-size:clamp(26px,4vw,40px);font-weight:600;color:var(--mark)}
.tool-result .cap{font-size:12px;color:#b9bbc2;margin-top:4px}
.tool-result .grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:14px;margin-top:14px}
.tool-result .grid b{display:block;font-family:var(--mono);font-size:18px;color:#fff}
.tool-result .grid span{font-size:11.5px;color:#b9bbc2}

/* ── 披露块/页脚 ── */
.pfoot{border-top:3px solid var(--ink);margin-top:64px}
.pfoot .in{display:flex;align-items:center;justify-content:center;gap:16px;padding:22px 26px;flex-wrap:wrap}
.okx-logo{font-weight:900;font-size:30px;letter-spacing:-1.4px}
.pfoot .x{color:var(--faint)}
.pfoot .cs{font-weight:800;font-size:15px}
.pfoot p{font-size:12px;color:var(--sub);max-width:38em}
footer.site{border-top:1px solid var(--hair);padding:26px 0 40px;font-size:12.5px;color:var(--faint)}
footer.site .cols{display:flex;gap:40px;flex-wrap:wrap;justify-content:space-between}
footer.site a{color:var(--sub)}
footer.site a:hover{color:var(--ink)}
footer.site .flinks{display:flex;gap:18px;flex-wrap:wrap}

@media(max-width:760px){
  html,body{overflow-x:hidden}
  *{min-width:0}
  /* 移动端只藏菜单链接,语言胶囊保留且触摸目标加大到 ≥44px */
  .top nav{gap:8px}
  .top nav > a{display:none}
  .top .lang a,.top .lang span{padding:12px 13px;font-size:13px}
  .disc2{font-size:10px;padding:4px 8px}
  .state{padding:26px 0 0}
  .state .alias{display:none}
  h1.giant{letter-spacing:0;font-size:clamp(29px,8.4vw,92px);margin:6px 0 8px}
  .state .lead{font-size:13.5px;line-height:1.55}
  .codewall{padding:26px 0 8px}
  .cw-lab{margin-bottom:10px;font-size:11px;letter-spacing:2px}
  .cw-under{margin-top:14px;font-size:13px}
  .cw-actions{margin-top:12px;gap:8px}
  .btn-copy{padding:11px 16px;font-size:13.5px}
  .btn-go{padding:11px 18px;font-size:14px}
  .cw-foot{margin-top:10px}
  .cells{gap:7px}
  .cell{box-shadow:0 4px 0 var(--ink);border-width:2.5px;width:clamp(42px,12.5vw,92px);height:clamp(50px,14.5vw,112px)}
  .fxgrid{grid-template-columns:1fr}
  .fx:nth-child(odd){border-right:0}
  .fx{padding:16px 20px}
  .fx .no{font-size:27px;flex:0 0 44px}
  .btn-copy,.btn-go{flex:1 1 auto;justify-content:center;text-align:center}
  .toolgrid{grid-template-columns:1fr}
  .tool:nth-child(3n){border-right:1px solid var(--hair)}
  .tool{border-right:0}
  .artrow .d{display:none}
  .cta-strip{box-shadow:4px 4px 0 var(--mark)}
  .step{box-shadow:3px 3px 0 var(--hair)}
}