:root{color-scheme:light;--bc_ink:#171b24;--bc_muted:#5d6470;--bc_line:#dfe3e9;--bc_yellow:#f5cc48;--bc_soft:#f5f6f8;--bc_white:#fff;--bc_radius:16px}
    *,*::before,*::after{box-sizing:border-box}
    html{scroll-behavior:smooth;scroll-padding-top:100px}
    body{margin:0;color:var(--bc_ink);background:var(--bc_white);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.8;-webkit-text-size-adjust:100%}
    a{color:inherit;text-decoration-thickness:1px;text-underline-offset:4px}
    a:hover{color:#755500}
    a:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:3px solid #936a00;outline-offset:5px}
    h1,h2,h3,p,ol,ul,dl,figure{margin:0}
    h1,h2,h3{font-weight:750;line-height:1.45;text-wrap:balance}
    h2{font-size:30px;letter-spacing:-.6px}
    h3{font-size:19px}
    p+p{margin-top:12px}
    strong{font-weight:700}
    svg{display:block;flex-shrink:0}
    button,a,summary{-webkit-tap-highlight-color:transparent}
    .bc_wrap{width:min(1160px,calc(100% - 64px));margin-inline:auto}
    .bc_skip{position:absolute;top:8px;left:12px;z-index:20;padding:10px 16px;background:var(--bc_yellow);transform:translateY(-160%)}
    .bc_skip:focus{transform:translateY(0)}
    .bc_header{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.97);border-bottom:1px solid var(--bc_line)}
    .bc_header_inner{min-height:78px;display:flex;align-items:center;justify-content:space-between;gap:24px}
    .bc_brand{display:flex;align-items:center;gap:11px;text-decoration:none;white-space:nowrap}
    .bc_brand_icon{width:34px;height:34px;display:grid;place-items:center;background:var(--bc_ink);border-radius:9px;color:var(--bc_yellow)}
    .bc_brand_name{font-size:21px;font-weight:800;letter-spacing:.5px}
    .bc_brand_note{color:var(--bc_muted);font-size:13px;border-left:1px solid var(--bc_line);padding-left:16px;margin-left:6px}
    .bc_nav{display:flex;align-items:center;gap:28px;font-size:14px;font-weight:600}
    .bc_nav a{text-decoration:none;padding-block:10px}
    .bc_nav .bc_nav_download{padding:9px 17px;background:var(--bc_ink);color:#fff;border-radius:7px}
    .bc_hero{padding:60px 0 34px}
    .bc_breadcrumb{font-size:13px;color:var(--bc_muted);margin-bottom:35px}
    .bc_breadcrumb a{text-decoration:none}
    .bc_breadcrumb span{margin-inline:10px;color:#8c939e}
    .bc_hero_grid{display:grid;grid-template-columns:1.32fr 1fr;gap:70px;align-items:center}
    .bc_eyebrow{display:flex;align-items:center;gap:10px;font-size:13px;font-weight:650;letter-spacing:1.5px;color:var(--bc_muted);margin-bottom:18px}
    .bc_eyebrow::before{content:"";width:27px;height:3px;background:var(--bc_yellow)}
    h1{font-size:clamp(34px,4.4vw,53px);line-height:1.28;letter-spacing:-1.7px}
    .bc_hero_subtitle{font-size:26px;line-height:1.6;margin-top:14px;font-weight:500;letter-spacing:-.3px}
    .bc_intro{color:var(--bc_muted);line-height:1.95;margin-top:20px;max-width:540px}
    .bc_actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-top:27px}
    .bc_button{display:inline-flex;min-height:48px;align-items:center;justify-content:center;gap:14px;padding:11px 23px;border-radius:8px;border:1px solid transparent;background:var(--bc_yellow);color:var(--bc_ink);text-decoration:none;font-weight:700;line-height:1.5;transition:background .15s}
    .bc_button:hover{background:#edbc24;color:var(--bc_ink)}
    .bc_button_outline{background:#fff;border-color:#ced3dc;font-weight:600}
    .bc_button_outline:hover{background:var(--bc_soft)}
    .bc_meta{display:flex;gap:18px;flex-wrap:wrap;color:var(--bc_muted);font-size:13px;margin-top:25px}
    .bc_check_panel{background:var(--bc_ink);color:#fff;border-radius:20px;padding:29px 31px 24px;position:relative}
    .bc_panel_label{font-size:12px;color:#b9c0cc;letter-spacing:2px;margin-bottom:6px}
    .bc_check_panel h2{font-size:23px;letter-spacing:0;margin-bottom:17px}
    .bc_hero_checks{list-style:none;padding:0;counter-reset:hero}
    .bc_hero_checks li{display:flex;align-items:center;gap:18px;padding:14px 0;border-bottom:1px solid #363b45;counter-increment:hero}
    .bc_hero_checks li::before{content:"0" counter(hero);font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:15px;color:var(--bc_yellow)}
    .bc_hero_checks li:last-child{border:0}
    .bc_hero_checks strong{display:block;font-size:16px}
    .bc_hero_checks small{display:block;color:#b9c0cc;font-size:13px;margin-top:1px}
    .bc_scope{display:flex;gap:18px;align-items:baseline;margin-top:42px;padding:18px 22px;background:var(--bc_soft);border-radius:9px;font-size:14px;color:var(--bc_muted);line-height:1.85}
    .bc_scope strong{flex-shrink:0;color:var(--bc_ink)}
    .bc_layout{display:grid;grid-template-columns:190px minmax(0,1fr);gap:62px;padding:30px 0 68px}
    .bc_sidebar_inner{position:sticky;top:110px}
    .bc_sidebar_label{font-size:13px;color:var(--bc_muted);padding:0 0 16px;letter-spacing:2px;border-bottom:1px solid var(--bc_line)}
    .bc_toc{list-style:none;padding:14px 0 0}
    .bc_toc li{margin-bottom:4px}
    .bc_toc a{display:flex;gap:13px;padding:10px 0;text-decoration:none;font-size:14px;font-weight:550}
    .bc_toc span{color:#7b8391;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:12px;padding-top:2px}
    .bc_side_note{margin-top:25px;padding:18px 0;border-top:1px solid var(--bc_line);font-size:13px;color:var(--bc_muted);line-height:1.85}
    .bc_side_note strong{color:var(--bc_ink);display:block;margin-bottom:6px;font-size:14px}
    .bc_section{padding:0 0 48px;margin-bottom:44px;border-bottom:1px solid var(--bc_line);scroll-margin-top:100px}
    .bc_section:last-child{margin-bottom:0;padding-bottom:0;border-bottom:0}
    .bc_section_top{display:flex;align-items:center;gap:12px;margin-bottom:13px}
    .bc_section_no{display:grid;place-items:center;width:32px;height:26px;border-radius:5px;background:var(--bc_yellow);font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:12px;font-weight:700}
    .bc_section_label{color:var(--bc_muted);font-size:13px;letter-spacing:.5px}
    .bc_section_intro{color:var(--bc_muted);margin-top:16px;margin-bottom:23px}
    .bc_prepare{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:23px;margin-top:27px}
    .bc_prepare_item{border-top:2px solid var(--bc_ink);padding-top:17px}
    .bc_prepare_item p{font-size:16px;color:var(--bc_muted);margin-top:9px;line-height:1.9}
    .bc_inline_source{font-size:13px;color:var(--bc_muted);margin-top:18px}
    .bc_inline_source a{color:#6c5100}
    .bc_table_wrap{border:1px solid var(--bc_line);border-radius:11px;overflow:auto}
    .bc_table{width:100%;border-collapse:collapse;min-width:570px;text-align:left;line-height:1.8}
    .bc_table caption{caption-side:top;text-align:left;padding:13px 18px;background:var(--bc_soft);font-size:13px;color:var(--bc_muted)}
    .bc_table th,.bc_table td{padding:17px 18px;vertical-align:top;border-bottom:1px solid var(--bc_line);font-size:14px}
    .bc_table th{background:var(--bc_soft);font-weight:650}
    .bc_table th:first-child{width:23%}
    .bc_table th:nth-child(2){width:27%}
    .bc_table tbody th{background:#fff}
    .bc_table tr:last-child th,.bc_table tr:last-child td{border-bottom:0}
    .bc_table td:last-child{color:var(--bc_muted)}
    .bc_mobile_hint{display:none;font-size:12px;color:var(--bc_muted);margin-bottom:8px}
    .bc_callout{padding:17px 20px;margin-top:20px;border-left:3px solid var(--bc_yellow);background:var(--bc_soft);font-size:14px;color:var(--bc_muted);line-height:1.9}
    .bc_callout strong{color:var(--bc_ink)}
    .bc_steps{padding:4px 0 0;list-style:none;counter-reset:step}
    .bc_steps>li{position:relative;padding:0 0 30px 56px;counter-increment:step}
    .bc_steps>li::before{content:counter(step);position:absolute;left:0;top:0;width:33px;height:33px;border:1px solid #cdd2db;background:#fff;border-radius:50%;display:grid;place-items:center;font-weight:750;font-size:14px}
    .bc_steps>li::after{content:"";position:absolute;left:16px;top:41px;bottom:9px;border-left:1px solid var(--bc_line)}
    .bc_steps>li:last-child{padding-bottom:0}
    .bc_steps>li:last-child::after{display:none}
    .bc_steps p{margin-top:9px;color:var(--bc_muted);line-height:1.9}
    .bc_steps .bc_step_tip{font-size:14px;color:#5b470b;background:#fff8df;padding:10px 14px;margin-top:12px;border-radius:6px}
    .bc_example{display:grid;grid-template-columns:1fr 1.08fr;gap:28px;border-radius:12px;background:var(--bc_soft);padding:23px;margin:27px 0 29px}
    .bc_example h3{font-size:18px}
    .bc_example p{color:var(--bc_muted);font-size:14px;line-height:1.85;margin-top:10px}
    .bc_example_tag{display:inline-block;color:#685016;font-size:12px;letter-spacing:.3px;margin-bottom:9px}
    .bc_receipt{background:#fff;border:1px solid #e2e5eb;border-top:3px solid var(--bc_yellow);border-radius:3px 3px 9px 9px;padding:17px 20px}
    .bc_receipt dl>div{display:flex;justify-content:space-between;gap:15px;font-size:13px;margin-bottom:8px}
    .bc_receipt dt{color:var(--bc_muted)}
    .bc_receipt dd{margin:0;font-variant-numeric:tabular-nums;font-weight:600;white-space:nowrap}
    .bc_receipt_total{border-top:1px dashed #ccd2dc;padding-top:12px;margin-top:12px}
    .bc_receipt .bc_receipt_total dd{font-size:17px}
    .bc_example figcaption{grid-column:1/-1;font-size:12px;color:var(--bc_muted);margin-top:-14px;line-height:1.75}
    .bc_download{background:var(--bc_ink);color:#fff;border-radius:15px;padding:27px 28px;margin-top:24px;display:grid;grid-template-columns:1fr auto;gap:24px;align-items:center}
    .bc_download h3{font-size:23px;letter-spacing:.5px}
    .bc_download p{font-size:14px;color:#bac2cf;line-height:1.85;margin-top:6px}
    .bc_download .bc_download_domain{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:12px;color:#bdc5d2;margin-top:11px}
    .bc_download_action{text-align:center}
    .bc_download_action p{font-size:12px;margin-top:9px}
    .bc_specs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-top:19px;padding-bottom:20px;border-bottom:1px solid var(--bc_line)}
    .bc_specs dt{font-size:13px;color:var(--bc_muted)}
    .bc_specs dd{font-size:14px;margin:4px 0 0;font-weight:600}
    .bc_install{display:grid;grid-template-columns:1fr 1fr;gap:30px;margin-top:27px}
    .bc_install h3{margin-bottom:12px;font-size:18px}
    .bc_small_list{padding-left:20px;color:var(--bc_muted);font-size:16px;line-height:1.95}
    .bc_small_list li+li{margin-top:9px}
    .bc_faq{margin-top:23px;border-top:1px solid var(--bc_line)}
    .bc_faq details{border-bottom:1px solid var(--bc_line)}
    .bc_faq summary{cursor:pointer;list-style:none;display:flex;align-items:baseline;justify-content:space-between;gap:20px;padding:19px 2px;font-size:16px;font-weight:650;line-height:1.8}
    .bc_faq summary::-webkit-details-marker{display:none}
    .bc_faq summary::after{content:"+";font-size:22px;color:#6b737f;line-height:1;flex-shrink:0;font-weight:400}
    .bc_faq details[open] summary::after{content:"−"}
    .bc_faq details[open] summary{padding-bottom:10px}
    .bc_faq details p{padding:0 28px 21px 2px;color:var(--bc_muted);font-size:16px;line-height:1.95}
    .bc_sources{list-style:none;padding:0;margin-top:20px;display:grid;grid-template-columns:1fr 1fr;gap:13px 28px}
    .bc_sources li{font-size:14px;line-height:1.65}
    .bc_sources span{display:block;color:var(--bc_muted);font-size:12px;margin-top:3px}
    .bc_update{border-top:1px solid var(--bc_line);margin-top:25px;padding-top:20px;font-size:13px;color:var(--bc_muted)}
    .bc_risk{padding:22px 25px;background:var(--bc_soft);border-radius:9px;margin-top:23px;font-size:14px;color:var(--bc_muted)}
    .bc_risk strong{color:var(--bc_ink)}
    .bc_footer{background:var(--bc_ink);color:#fff;padding:35px 0 27px}
    .bc_footer_top{display:flex;justify-content:space-between;gap:30px;align-items:flex-start}
    .bc_footer_title{font-size:20px;font-weight:700}
    .bc_footer p{font-size:13px;color:#b9c0cc;margin-top:9px;max-width:720px;line-height:1.85}
    .bc_footer a{font-size:14px;white-space:nowrap;color:#e2e6ec}
    .bc_footer_bottom{border-top:1px solid #393e48;padding-top:18px;margin-top:26px;display:flex;justify-content:space-between;gap:20px;color:#b9c0cc;font-size:12px}
    @media(min-width:1500px){.bc_hero{padding-top:67px}.bc_hero_grid{gap:95px}}
    @media(max-width:1050px){.bc_brand_note{display:none}.bc_hero_grid{gap:35px}.bc_layout{grid-template-columns:150px minmax(0,1fr);gap:35px}.bc_nav{gap:22px}.bc_check_panel{padding:25px}.bc_download{grid-template-columns:1fr}.bc_download_action{text-align:left}.bc_prepare{gap:18px}.bc_example{grid-template-columns:1fr;gap:18px}.bc_example figcaption{margin-top:0}}
    @media(max-width:780px){.bc_wrap{width:calc(100% - 40px)}.bc_header{position:relative}.bc_header_inner{flex-wrap:wrap;gap:0;min-height:unset;padding:16px 0 9px}.bc_brand{margin-bottom:13px}.bc_brand_note{display:block;font-size:12px}.bc_nav{width:100%;justify-content:space-between;gap:9px;border-top:1px solid #eef0f3;padding-top:7px}.bc_nav a{font-size:14px;white-space:nowrap}.bc_nav .bc_nav_download{padding:7px 12px}.bc_hero{padding-top:26px}.bc_breadcrumb{margin-bottom:27px}.bc_hero_grid{grid-template-columns:1fr;gap:30px}.bc_intro{max-width:none}.bc_hero_subtitle{font-size:23px}.bc_check_panel{border-radius:13px}.bc_hero_checks{display:grid;grid-template-columns:1fr 1fr;gap:0 25px}.bc_hero_checks li:nth-child(3){border-bottom:0}.bc_hero_checks li{gap:12px}.bc_hero_checks small{font-size:12px}.bc_scope{margin-top:27px;display:block;padding:17px 18px}.bc_scope strong{display:block;margin-bottom:5px}.bc_layout{display:block;padding-top:10px}.bc_sidebar{display:none}.bc_section{padding-bottom:35px;margin-bottom:33px;scroll-margin-top:20px}h2{font-size:26px}.bc_section_intro{margin-top:13px}.bc_prepare{gap:20px}.bc_prepare_item h3{font-size:17px}.bc_prepare_item p{font-size:16px}.bc_download{grid-template-columns:1fr auto}.bc_example{grid-template-columns:1fr 1fr}.bc_example figcaption{margin-top:-6px}.bc_footer_top{gap:20px}html{scroll-padding-top:20px}}
    @media(max-width:520px){.bc_wrap{width:calc(100% - 36px)}.bc_brand_name{font-size:20px}.bc_brand_note{font-size:12px;margin-left:0;padding-left:11px}.bc_nav{gap:5px}.bc_nav a{font-size:14px}.bc_nav .bc_nav_download{padding:7px 9px}.bc_breadcrumb{font-size:12px}.bc_eyebrow{font-size:12px;letter-spacing:1px}h1{font-size:35px;letter-spacing:-1px}.bc_hero_subtitle{font-size:22px;margin-top:11px}.bc_intro{font-size:16px;margin-top:17px}.bc_actions{gap:9px;margin-top:23px}.bc_actions .bc_button{font-size:14px;padding:12px 16px;flex:1}.bc_meta{gap:12px;font-size:12px;margin-top:20px}.bc_check_panel{padding:23px 21px 17px}.bc_check_panel h2{font-size:21px}.bc_hero_checks{grid-template-columns:1fr}.bc_hero_checks li{padding:11px 0;gap:16px}.bc_hero_checks li:nth-child(3){border-bottom:1px solid #363b45}.bc_hero_checks strong{font-size:15px}.bc_hero_checks small{font-size:13px}.bc_prepare{grid-template-columns:1fr;gap:19px}.bc_prepare_item{padding-top:13px}.bc_prepare_item h3{font-size:18px}.bc_prepare_item p{font-size:16px;margin-top:6px}.bc_mobile_hint{display:block}.bc_steps>li{padding-left:46px}.bc_steps h3{font-size:18px}.bc_steps p{font-size:16px}.bc_example{grid-template-columns:1fr;padding:20px;gap:17px}.bc_example figcaption{margin-top:0}.bc_download{grid-template-columns:1fr;gap:19px;padding:23px}.bc_download .bc_button{width:100%}.bc_specs{gap:13px;grid-template-columns:1fr}.bc_specs>div{display:flex;gap:17px}.bc_specs dt{min-width:78px}.bc_specs dd{margin:0}.bc_install{grid-template-columns:1fr;gap:24px}.bc_sources{grid-template-columns:1fr;gap:16px}.bc_footer_top{display:block}.bc_footer_top>a{display:inline-block;margin-top:20px}.bc_footer_bottom{display:block}.bc_footer_bottom span{display:block;margin-top:6px}.bc_risk{padding:18px}.bc_faq summary{font-size:16px}.bc_table th,.bc_table td{padding:14px}.bc_section{padding-bottom:32px}h2{font-size:25px}.bc_section_top{margin-bottom:11px}}
    @media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
    @media print{.bc_header,.bc_sidebar,.bc_actions,.bc_download_action,.bc_skip,.bc_footer_top>a{display:none}body{font-size:12pt;color:#000}.bc_wrap{width:100%}.bc_layout,.bc_hero_grid,.bc_example,.bc_install{display:block}.bc_hero{padding:0}.bc_check_panel,.bc_footer,.bc_download{background:#fff!important;color:#000!important;border:1px solid #bbb}.bc_check_panel *,.bc_download *,.bc_footer *{color:#000!important}.bc_section{break-inside:auto}.bc_steps>li,.bc_prepare_item{break-inside:avoid}.bc_faq details::details-content{content-visibility:visible}.bc_section{margin-bottom:25px;padding-bottom:25px}.bc_footer{margin-top:24px}}